213 results about "Graphene electrode" patented technology

The invention relates to the technical field of electronic elements, in particular to a ternary compound for a memristor array and a preparation method of the ternary compound. The ternary complex comprises A, B and C, A is a guest molecule of a pyridine derivative with an amino terminal, B is a bridging molecule, and C is a host molecule with a cucurbituril structure. A, B and C are self-assembled in an aqueous solution through Van der Waals force and hydrophobic interaction among molecules to form a ternary complex; the host molecule C has a barrel-shaped cavity structure, and the guest molecule A and the bridging molecule B are included in the barrel-shaped cavity structure. The ternary complex forms a supramolecular chain junction at the end part of the graphene electrode, so that the graphene electrode with different gaps can be adapted, and the molecular connection success rate of the array is greatly improved. The preparation method of the ternary complex is simple, convenient, easy to operate and suitable for large-scale production.

The object of the present invention is to provide a flexible OECT non-enzymatic glucose sensor and a preparation method thereof, belonging to the technical field of glucose electrochemical sensors. The sensor uses a chemically modified laser-induced graphene (LIG) electrode as the gate, and gold nanoclusters (AuNC) are modified on the LIG through controllable in-situ electrochemical reduction; at the same time, by utilizing the pH-dependent conductivity of PEDOT:PSS, the self-calibration of the sensor of the present invention to the pH change of human sweat is realized, thereby reducing interference and improving the measurement accuracy. The flexible non-enzymatic glucose sensor designed by the present invention has the advantages of high detection sensitivity, low detection limit, excellent long-term stability, and being unaffected by pH value fluctuations, and can be widely applied to the field of wearable electronics.

The invention relates to the technical field of semiconductors, in particular to a graphene electrode-based monomolecular chain pH sensor and a preparation method thereof, the pH sensor comprises a graphene source terminal electrode, a monomolecular chain and a graphene drain terminal electrode which are sequentially connected through amido bonds; the monomolecular chain comprises a starting unit, a monomolecular polymer and a terminating unit which are connected in sequence, the starting unit and the terminating unit are selected from aniline or phenylenediamine, the monomolecular polymer is formed by electrochemical polymerization of monomer molecules, the monomer molecules are selected from aniline or aniline derivatives, and the polymerization process of the monomer molecules is controllable through an electrochemical polymerization method; the static electrode is combined with the dynamic assembly, so that the performance optimization of the pH sensor can be realized; meanwhile, according to the electrochemical polymerization method, the number of monomer molecules can be flexibly adjusted in the dynamic assembly process, the size adaptability of a single molecular chain and the static graphene electrode is remarkably improved, and therefore the connection success rate is increased.

The invention aims to provide a flexible OECT non-enzymatic glucose sensor and a preparation method thereof, and belongs to the technical field of glucose electrochemical sensors. According to the sensor, a chemically modified laser-induced graphene (LIG) electrode is used as a grid electrode, and gold nanoclusters (AuNC) are modified on LIG through controllable in-situ electrochemical reduction; meanwhile, the pH-dependent conductivity of PEDOT: PSS is utilized to realize the self-calibration of the sensor to the pH change of human sweat, so that the interference is reduced, and the measurement accuracy is improved. The flexible non-enzymatic glucose sensor designed by the invention has the advantages of high detection sensitivity, low detection limit, excellent long-term stability, no influence of pH value fluctuation and the like, and can be widely applied to the field of wearable electronics.

The invention relates to the technical field of molecular optoelectronic devices, and particularly discloses a tunable polarization photon source based on perovskite quantum dots and a preparation method thereof, and the method comprises the following steps: transferring a graphene-PMMA structure to the surface of a silicon wafer, and marking a pattern; manufacturing an outer lead electrode on the graphene according to the pattern; manufacturing a graphene electrode pair; and preparing chiral molecules with adjustable chirality: condensing the chiral molecules and graphene electrode amide, then adding a perovskite quantum dot precursor solution for reaction, and assembling quantum dots between the graphene electrode pairs in situ to obtain the tunable polarized photon source. According to the graphene electrode single-molecule device based on the dotted line etching method, a circularly polarized photon source is constructed, and quantum dots with high quality and controllable morphology are constructed by connecting chiral molecules to the edge of a graphene electrode and introducing chiral sites to assemble the quantum dots in situ; the molecular connection success rate is greatly improved; meanwhile, the molecular connection period is shortened.

The invention discloses a double-channel gold-copper-doped graphene electrochemical immunosensor as well as a preparation method and application thereof. The double-channel gold-copper-doped graphene electrochemical immunosensor comprises a gold / gold-copper co-doped vertical graphene electrode, and bovine serum albumin and an antibody which are incubated on the gold / gold-copper co-doped vertical graphene electrode, the gold / gold-copper co-doped vertical graphene electrode comprises a gold-copper co-doped vertical graphene electrode and gold nanoparticles loaded on the surface of the gold-copper co-doped vertical graphene electrode, and the gold-copper co-doped vertical graphene electrode comprises a substrate and a gold-copper co-doped vertical graphene nanosheet grown on the surface of the substrate. The sensor capable of sensitively detecting the concentration of the carcinoembryonic antigen secreted by the tumor cells is prepared, an immunoreaction detection system is built, a reliable industrial signal amplification platform is provided for early diagnosis of tumors, and a new strategy is developed for research of tumor cytology.

Embodiments relate to a non-enzymatic glucose sensor. The non-enzymatic glucose sensor comprises one or more electrodes, a microfluidic channel, and at least one inlet, wherein the at least one inlet is configured to deliver a fluid to a microfluidic channel and wherein the microfluidic channel is configured to transport the fluid to the one or more electrodes. At least one of the one or more electrodes is a laser-induced graphene electrode, wherein the laser-induced graphene electrode comprises one or more uniform coatings of metal.

The invention discloses a liquid crystal cascade superstructure device for actively regulating and controlling vortex waves on the upper surface of a terahertz sheet, and belongs to the technical field of terahertz devices. The device is composed of a dielectric spiral metasurface, a metal spiral metasurface, two liquid crystal layers, two graphene electrode layers and two glass substrates. The medium spiral metasurface excites free space vortexes locked in a spinning mode, the metal spiral metasurface constructs two on-chip channels, and the liquid crystal layer dynamically regulates and controls the spinning state. The device is based on spin-orbital angular momentum coupling and photon state superposition principles, and excitation of on-chip vortexes of spin decoupling is realized through a cascade strategy. In addition, by controlling the orientation of the two layers of liquid crystals, various on-chip vortex states can be achieved in the two channels respectively. Therefore, the device realizes eight vortex states and active switching thereof. The liquid crystal cascade super-structure device has the advantages of on-chip double channels, multi-state multiplexing and active adjustability, and has important application value in the fields of terahertz high-speed communication, information processing, substance detection and the like.

The invention relates to the technical field of film strain, in particular to a preparation and installation method of a film strain sensor and a harmonic reducer. The preparation and installation method comprises the steps that the surface of a workpiece to be installed is coated with a polyamide acid solution, then heating is conducted, and polyamide acid is subjected to dehydration cyclization to form a polyimide film attached to the surface of the workpiece to be installed; and then, forming a laser-induced graphene electrode pattern on the polyimide film. The harmonic reducer comprises a wave generator, a rigid gear, a flexible gear and a thin film strain sensor, the flexible gear is connected into the rigid gear in a toothed mode, and the wave generator is arranged in the flexible gear; the film strain sensor comprises a strain film and a graphene electrode, the graphene electrode is formed on the strain film, and the strain film is in direct contact connection with the surface of the flexible gear. Through the film strain sensor adhered to the surface of the workpiece to be installed, in-situ torque detection can be achieved, measurement errors, hysteresis, instability and the like caused by a glue joint layer are avoided, and measurement is more accurate.

The invention belongs to the technical field of graphene preparation, and discloses a preparation method of a modified graphene electrode material of a lithium ion battery and a related product, the method comprises the following steps: pre-mixing graphite powder and concentrated sulfuric acid, then adding an oxidant in batches, carrying out suction filtration after oxidation is completed, and washing to be neutral by using diluted hydrochloric acid and deionized water; deionized water is added into the washed graphite oxide, and after multi-stage ultrasonic treatment, a graphene oxide dispersion liquid is obtained through centrifugal separation; mixing the graphene oxide dispersion liquid with a predetermined amount of urea, carrying out a multi-step hydrothermal reaction, and then carrying out centrifugal cleaning and freeze drying to obtain nitrogen-doped modified graphene powder; the nitrogen-doped modified graphene powder and absolute ethyl alcohol are ground and mixed, the surface of a pretreated foamed nickel current collector is coated with the mixture through dip coating, compaction treatment is conducted, and the modified electrode material is obtained. According to the scheme, the conductivity and the cycling stability of the graphene electrode in the lithium ion battery can be improved.

The invention provides a method for preparing a 4, 4 '-biphenol compound by an electrochemical method, which is characterized in that in a diaphragm-free electrolytic bath, a phenol compound and a salt solution thereof are used as raw materials, a boron-phosphorus doped graphene electrode is used as an anode electrode, and an electrolytic reaction is carried out to generate the 4, 4'-biphenol compound. According to the method provided by the invention, the para-coupled product 4, 4 '-biphenol compound can be obtained with high selectivity through electrochemical phenol oxidative coupling, the selectivity is high, only trace electrolyte salt is used in the whole process, and basically no three wastes are generated. Compared with the traditional catalytic reaction, the method has the advantages of open reaction, mild reaction conditions, no generation of isomerized products, great shortening of the separation and purification process, and very good industrial application scenario.

The invention relates to the technical field of microelectronic devices, in particular to a single-molecule memristor-rectifier device based on supramolecular assembly and a preparation method thereof. According to the preparation method, the guest molecule B is covalently connected with the tail end of the graphene electrode pair, so that stable and tight interface bonding between the supramolecular functional molecule and the electrode can be ensured; and then soaking the graphene electrode pair connected with the guest molecule B in a solution containing the host molecule A and the guest molecule C to form a supramolecular functional molecule between the graphene electrode pair. The guest molecule C in the supramolecular functional molecule has intrinsic oxidation-reduction activity, and the molecular structure of the guest molecule C can generate a reversible electron gain and loss process, so that controllable and reversible adjustment of charge distribution in the molecule is realized. Under the action of an electric field, through the reversible oxidation-reduction reaction of the guest molecule C, significant changes of intramolecular charge distribution and electron transmission characteristics are triggered, and finally reliable switching of high and low resistance states of the device is achieved.

The invention discloses a polarization-sensitive narrow-band solar blind self-driven photoelectric detector and a preparation method thereof, and belongs to the technical field of semiconductor photoelectric devices. The detector comprises an n-type conductive single Ga2O3 micron wire, a p-type conductive GaN substrate, a PET substrate and a two-dimensional graphene film. According to the device, Ni / Au alloy is selected as a positive electrode, and a two-dimensional graphene film is used as a transparent window of ultraviolet solar blind light and a negative electrode of the device. By means of built-in potential formed by the n-Ga2O3 / p-GaN heterojunction and a Schottky barrier of Ga2O3 / Graphene, high-sensitivity detection of solar-blind ultraviolet light under the self-driving condition is achieved. The device has relatively high responsivity, specific detection rate and external quantum efficiency. The preparation method comprises the following steps: cleaning the GaN substrate, evaporating the Ni / Au electrode, adhering the PET substrate with the channel, transferring the Ga2O3 micron wire to form the heterojunction, and transferring and curing the graphene electrode. The device has the characteristics of polarization sensitivity and low power consumption, and can be applied to the fields of ultraviolet solar blind band encryption communication and environment monitoring.

The invention relates to the technical field of single-molecule devices, in particular to a single-molecule device for detecting small-molecule gas based on supramolecules and a preparation method of the single-molecule device. The monomolecular device comprises a functional molecule and a graphene electrode pair, wherein the functional molecule is connected between the graphene electrode pair through an amido bond. A cucurbituril hydrophobic cavity structure in the functional molecular structural formula can contain and capture target small molecular gas, gas molecules of different volumes are selectively included through multiple weak interaction, a dynamically-adjustable subject-object compound structure is formed, and then switching type sensing detection on the small molecular gas is achieved. The amino terminal of the end part of the main bridging unit in the functional molecule can be connected with the carboxyl terminal of the graphene point electrode in a covalent bond manner, and amide condensation molecular chain connection is formed at the two ends of the graphene point electrode, so that the stability of a monomolecular device is improved. The preparation method provided by the invention is simple in process, mild and controllable in reaction condition and beneficial to large-scale production.

The invention belongs to the technical field of flexible electronics and sensing, and relates to a stepped multi-mode flexible sensor based on laser-induced graphene and a preparation method of the stepped multi-mode flexible sensor. The sensor comprises a humidity sensitive layer, a pressure sensitive layer, a strain sensitive layer and a temperature sensitive layer which are sequentially stacked in a stepped mode from top to bottom, each sensitive layer comprises a flexible substrate, a laser-induced graphene (LIG) electrode and a connecting area penetrating through the flexible substrate, and the sensitive layers are connected in series through the connecting areas. Through an infrared laser processing method, all the sensitive layers are broken through, all the sensing sensitive layers are communicated, and assembling is carried out. And independent sensing of each physical quantity is realized by leading out a corresponding port on each sensing sensitive layer. According to the stepped structure, spatial isolation is carried out through the flexible substrate, signal crosstalk is reduced, low-cost and high-precision manufacturing is achieved in combination with the laser direct writing process, and the stepped structure is suitable for the fields of medical health monitoring, industrial equipment diagnosis, intelligent robots and the like.

The invention relates to the technical field of gamma-aminobutyric acid detection, and provides a flexible molecular imprinting sensor for in-situ and in-vivo detection of the content of gamma-aminobutyric acid in plants and a manufacturing method and a detection method of the flexible molecular imprinting sensor, the flexible molecular imprinting sensor comprises a flexible substrate and a graphene electrode unit, and the graphene electrode unit is arranged on the flexible substrate; the graphene electrode unit comprises a guide rail, a working electrode, a counter electrode and a reference electrode, the working electrode sequentially comprises a first modification layer, a second modification layer and a third modification layer from inside to outside, the first modification layer comprises an AuNPs material, the second modification layer comprises an Fc-Ni3 (HITP) 2-ZnFe-LDH material, and the third modification layer comprises an MIP material. The flexible molecular imprinting sensor is attached to the surface of a plant leaf, can still keep stable electrochemical performance under the condition of deformation, has high sensitivity and high specificity, and can perform in-vivo and in-situ detection on the content of gamma-aminobutyric acid in a plant body on the surface of the plant leaf.

The utility model belongs to the technical field of biosensors, and provides a closed-loop control system, which comprises a graphene electrode microneedle sensor, an ultrasonic pump and a control module, the graphene electrode micro-needle sensor comprises a polystyrene micro-needle array, a working electrode and a reference electrode / counter electrode cover the convex surface of a micro-needle body of the polystyrene micro-needle array, and the electrodes comprise the working electrode and the reference electrode / counter electrode which are formed by printing graphene composite ink on the surface of the micro-needle array. The graphene-PB electrode can improve the sensitivity of the microneedle without changing the structural shape of the microneedle, the ultrasonic pump and the microneedle sensor are further integrated, medicine is conveyed through a hollow channel of the microneedle, and the microneedle has the advantages of being stable, wearable, miniaturized, painless, accurate, high in cost benefit, easy to manufacture and the like.

The present invention discloses an anti-corrosion and sterilization device and process for seawater cooling pipelines of high-power frequency converters. The device includes metal pipe fittings for cooling seawater circulation, graphene electrodes and an external power supply. The metal pipe fittings, graphene electrodes and external power supply are electrically connected, and the metal pipe fittings are negative electrodes and the graphene electrodes are positive electrodes, thereby forming a current path to electrolyze the cooling seawater of the pipe fittings to produce NaClO, HClO and chlorine, thereby preventing the growth and accumulation of microorganisms such as bacteria and algae in the pipe, keeping the inner wall clean, and ensuring the heat exchange effect. In addition, the metal pipe fittings are white copper pipes with titanium-plated inner surfaces, which have strong seawater corrosion resistance, ensure the corrosion resistance of the cooling pipe, and effectively ensure the stable operation of the system. Moreover, the present invention uses seawater as a cooling medium without considering the cost; the titanium-plated white copper pipe acts as a heat-conducting medium and can also be used as a cathode for chemical sterilization and sterilization, which greatly simplifies equipment investment, reduces floor space, and has good practical and economic value.

The invention relates to the technical field of single-molecule devices and sensors, in particular to a graphene single-molecule sensing device based on pillararene as well as a preparation method and application of the graphene single-molecule sensing device. The sensor comprises a pillararene molecule, the functional molecule is covalently connected between a graphene electrode pair through nucleophilic substitution reaction or amide condensation reaction under an alkaline condition, and the stability and the conductive reliability of a molecule-electrode interface are enhanced. According to the present invention, the column aromatic hydrocarbon molecules can selectively perform inclusion on the perfluorocarboxylic acid, and the combination of different types of perfluorocarboxylic acids and the column aromatic hydrocarbon molecules can show the difference characteristic of the conductive state so as to achieve the distinguishing of different perfluorocarboxylic acids, such that the method is hopeful to be used in the detection of perfluorocarboxylic acid. Meanwhile, perfluorocarboxylic acid can be effectively desorbed through methanol treatment, and an I-V signal is recovered to an initial state, so that the device has reusability. The preparation method provided by the invention is stable in process, high in repeatability and beneficial to large-scale production.

The invention relates to the field of coal graded conversion and utilization, in particular to a method for preparing a graphene battery electrode from coal tar with low energy consumption. According to the preparation method, coal tar serves as a carbon source, graphene grows on the surface of foam metal in situ at the low temperature of 300-900 DEG C, and a graphene-metal composite substrate is formed and used for synthesizing the self-supporting electrode material; according to the preparation method, continuous production is realized by a set of continuous production system. According to the method, the energy consumption of graphene electrode production is reduced through the process of growing graphene at low temperature through coal tar, the traditional coating step is omitted, a binder and a conductive agent are not needed, and the prepared electrode shows high specific capacity and low charge transfer impedance.

The invention relates to the technical field of lithium battery pole piece processing, and discloses a graphene pole piece processing device for a lithium battery, the graphene pole piece processing device comprises a processing table, the top of the processing table is fixedly connected with a driving mechanism, the surface of the driving mechanism is fixedly connected with a clamping mechanism, and the surface of the clamping mechanism is provided with an operating mechanism; the adjusting assembly comprises a vertical plate, the vertical plate is arranged at the top of the machining table, a hollowed-out seat is fixedly connected to the surface of the vertical plate, a cross-shaped sliding block is slidably connected into the hollowed-out seat, and an L-shaped plate is fixedly connected to the top of the cross-shaped sliding block. According to the graphene pole piece processing device for the lithium battery, through the arranged clamping mechanism, a cross-shaped block and a cross-shaped sliding block drive a friction block to slide in a friction seat through clamping force conduction, pressure is buffered through friction force, the situation that a pole piece is damaged due to instant too large clamping force is avoided, and the integrity and the processing precision of the pole piece in the processing process are fully guaranteed; and the strict requirement of the graphene pole piece of the lithium battery on the processing precision is met.

The invention discloses an infrared detector sensitive element structure, a preparation method and an infrared detector, and is applied to the field of infrared detection.The infrared detector sensitive element structure comprises a first electrode, a pyroelectric functional layer and a second electrode; the pyroelectric functional layer is a polyvinylidene fluoride based copolymer thin film layer, and the polyvinylidene fluoride based copolymer thin film layer directly absorbs infrared light; the first electrode is arranged on the surface of one side of the pyroelectric functional layer, the second electrode is arranged on the surface of the other side of the pyroelectric functional layer, and the surface, provided with the second electrode, of the pyroelectric functional layer is an infrared light incident surface; the second electrode is a single-layer graphene electrode; and the single-layer graphene electrode has permeability to infrared light. The polyvinylidene fluoride-based copolymer film layer is used as a pyroelectric functional layer, and the single-layer graphene electrode is used as an electrode of an infrared light incidence side, so that the thickness of the functional layer can be reduced, and the functional layer is enabled to directly dominate absorption of infrared radiation, thereby reducing the heat capacity of the device, and improving the response sensitivity and response speed of the device.

The invention discloses a photoelectric hybrid long-period fiber grating sensor. The photoelectric hybrid long-period fiber grating sensor comprises a micro-nano optical fiber, polydimethylsiloxane and a laser-induced graphene electrode array, two ends of the micro-nano optical fiber are respectively used as an optical signal input port and an optical signal output port; the micro-nanofiber is packaged by polydimethylsiloxane and patterned by laser-induced graphene to form a periodically arranged laser-induced graphene electrode array, and the laser-induced graphene electrode array generates a periodic refractive index modulation effect on the middle area of the lower-layer micro-nanofiber and meets the phase matching condition of the long-period grating. And the micro-nano fiber long-period fiber grating is formed. The large evanescent field characteristic of the micro-nano fiber and the high refractive index sensitivity characteristic of the long-period grating can be fully utilized, the conductive electrode of the modulation grating is used for sensing application, and the functions of electrical detection and optical detection are achieved.

The invention relates to an HEMT device integrating P-AlGaN and a graphene layer in a drain region and a manufacturing method, and belongs to the field of semiconductor power device manufacturing, the HEMT device sequentially comprises a substrate, a GaN buffer layer, a GaN channel layer and an AlGaN barrier layer from bottom to top, source metal is arranged above the left side of the AlGaN barrier layer, and the graphene layer is arranged above the right side of the AlGaN barrier layer. A p-GaN cap layer is arranged between the source electrode metal and the graphene layer above the AlGaN barrier layer, and grid electrode metal is arranged above the p-GaN cap layer; a plurality of p-AlGaN islands are arranged in the graphene layer, and drain metal is arranged above the graphene layer. According to the invention, through coexistence of PN junction regulation and ohmic contact, the effects of reducing resistance and improving heat dissipation and the like of the graphene electrode are combined, the comprehensive performance of the device is optimized, the breakdown voltage can be effectively improved, the on resistance is reduced, the current collapse is inhibited, and a new thought is provided for preparation of high-performance GaN power and radio frequency devices.

The present invention belongs to the technical field of electrode materials and heavy metal wastewater treatment, and discloses a WS2 / graphene electrode material, a preparation method thereof and an application. The preparation method comprises the following steps: sodium tungstate, thiourea and hydroxylamine hydrochloride are uniformly dispersed in deionized water, the pH is adjusted, graphene and a surfactant are added and mixed uniformly to obtain a mixed solution; the mixed solution is transferred to a pressure-resistant reactor, sealed and subjected to a hydrothermal reaction, and the reaction product is separated, washed and dried to obtain the WS2 / graphene electrode material. The preparation method of the WS2 / graphene electrode material of the present invention is simple, the reaction conditions are mild, and the cost is low; the obtained electrode material has a selective removal efficiency of more than 99% for heavy metal ions such as Cr 3+ , Cd 2+ , Pb 2+ , Ni 2+ , Co 2+ , Cu 2+ etc. Compared with conventional methods, it has the advantages of high energy efficiency, environmental friendliness, no pollution, etc., and has better cycle stability.

The invention discloses a graphene electrode material of a lead-acid storage battery and a preparation method of the graphene electrode material, and belongs to the technical field of electrode materials. The preparation method is used for solving the technical problem that the conductivity, the specific surface area, the first coulombic efficiency and the first discharge specific capacity of a graphene electrode material of a lead-acid storage battery in the prior art need to be further improved. Comprising the following components in parts by weight: 1000 parts of lead powder, 8-15 parts of barium sulfate, 3-8 parts of modified humic acid, 2.5-4 parts of modified lignin, 3-7 parts of carbon black, 3-10 parts of 3-10 graphene, 5-10 parts of modified graphite, 0.8-1.5 parts of a tin dioxide compound, 0.8-1.2 parts of carbon fibers, 3.5-5 parts of sulfuric acid and 12-15 parts of deionized water. Through the synergistic effect of the substances, the conductivity, the specific surface area, the first coulombic efficiency and the first discharge specific capacity of the electrode material are jointly improved.

The present invention discloses a Ge nanopillar photodetector modified with metal nanoparticles and a method for preparing the same. The device comprises: a bottom electrode; an intrinsic Ge substrate layer covering the bottom electrode; a plurality of Ge nanopillars periodically arranged on the intrinsic Ge substrate layer; metal nanoparticles adsorbed on the surface of the Ge nanopillars; a metal having a work function greater than 4.46 eV; and a graphene electrode covering the plurality of Ge nanopillars and separated from the intrinsic Ge substrate layer by a non-conductive dielectric material. The Ge nanopillar photodetector modified with metal nanoparticles provided by the present invention has low dark current, high photocurrent and high responsivity, and exhibits high detection performance.

A dielectrophoretic (DEP) sensor includes a graphene electrode adjacent a channel for confining a target particle in a liquid, a surface probe attached to a surface of the graphene electrode, the surface probe having a selective reaction with the target particle, and a voltage source electrically connected to the graphene electrode and configured to apply a voltage to the graphene electrode to cause DEP trapping of the target particle at the graphene electrode.

Provided are devices and methods for detecting a target molecule, based on using a graphene electrode. The devices exhibit high sensitivity to target molecules such as DNA that may be present at comparatively low concentrations.

The invention discloses a chemical sensing system based on graphene. The system includes a sensor module including a substrate, a plurality of pairs of electrodes disposed over the substrate, and a sensing layer disposed over each pair of electrodes on the substrate to form an array of sensing surfaces. The sensing layer is an integrated surface functionalization mask having an open slot for each sensing surface. Each open slot includes a different polymeric material. The surface functionalization mask enables simultaneous deposition of various polymeric materials to the sensing surface using microarray printing. The sensor module is configured to create sensor data when a chemical compound is presented on the sensing surface and a constant bias is applied on the electrodes, the sensor data having a cross-reaction response characteristic resulting from a temporary change in resistance of the graphene over time. The substrate further includes silicon (Si), thermally grown silicon dioxide (SiO2), and graphene. The electrode comprises a titanium / gold (Ti / Au) interdigital electrode.