48 results about "Organic electrochemical transistor" patented technology

The invention relates to a marine microorganism adhesion sensor based on an organic electrochemical transistor and a preparation method of the sensor. The sensor consists of a substrate (1), a drain electrode (2), a source electrode (3), a conductive polymer layer (4) with a microorganism detection function, a water storage pond (5) and a gate electrode (6), wherein the drain electrode (2) and the source electrode (3) are located above the substrate (1); the conductive polymer layer (4) is connected with the drain electrode (2) and the source electrode (3); the water storage pond (5) is located above the conductive polymer layer (4); the gate electrode (6) is located in the water storage pond (5), suspended above the conductive polymer layer (4) and connected with the conductive polymer layer (4) through electrolyte. The preparation method comprises the following preparation steps: washing and drying the substrate; preparing the source electrode and the drain electrode on the surface of the substrate; preparing a conductive polymer detection layer between the source electrode and the drain electrode; mounting the water storage pond on the surface of the conductive polymer layer. The marine microorganism adhesion sensor is simple in structure, simple in preparation method and easy to manufacture.

The invention discloses a sarcosine detection device as well as a preparation method and application thereof. The sarcosine detection device comprises an organic electrochemical transistor and a gate electrode with sarcosine oxidase immobilized. When the sarcosine to be detected has chemical reaction with the sarcosine oxidase on the gate electrode, the interfacial potential change of the gate electrode is caused, and finally, the detection of the sarcosine concentration is achieved by measuring the change of the channel current of the organic electrochemical transistor. The organic electrochemical transistor adopted by the invention has the functions of sensing and signal amplification, and has very high sensitivity and very low detection limit in sarcosine detection; and the sarcosine detection device provided by the invention has the advantages of simple structure, low production cost and low working voltage, and can achieve portable detection.

An organic electrochemical transistor (OECT) that may be used as a biosensor is built up by layers applied to a monofilament. A first conducting layer applied to the monofilament includes generally cylindrical source and drain contacts with a gap therebetween. An electro-active layer of an organic material altering its electrical conductivity through a change in redox state is in electrical contact with the source and drain contacts, and has a transistor channel interface for contacting an electrolyte. A gate electrode is spaced apart from the first monofilament, and may comprise a cylindrical layer built up on another length of monofilament.

An organic electrochemical transistor (OECT) that may be used as a biosensor is built up by layers applied to a monofilament. A first conducting layer applied to the monofilament includes generally cylindrical source and drain contacts with a gap therebetween. An electro-active layer of an organic material altering its electrical conductivity through a change in redox state is in electrical contact with the source and drain contacts, and has a transistor channel interface for contacting an electrolyte. A gate electrode is spaced apart from the first monofilament, and may comprise a cylindrical layer built up on another length of monofilament.

The invention relates to the field of sensors and in particular relates to a knittable fiber-based transistor glucose sensor and a preparation method of the knittable fiber-based transistor glucose sensor. The fiber-based transistor glucose sensor comprises an organic electrochemical transistor; the organic electrochemical transistor comprises a source-drain electrode and a grid electrode which is crossed with the source-drain electrode; gel electrolyte, which is used for stopping direct contact between the source-drain electrode and the grid electrode, is arranged at the crossed point of the source-drain electrode and the grid electrode; the source-drain electrode is a conductive high molecular composite material formed by polymerizing a flexible matrix material and a conductor monomer; the grid electrode is obtained by attaching glucose oxidase on the surface of the source-drain electrode through a fixing agent. The glucose sensor provided by the invention has relatively good flexibility, excellent sensing performance and relatively good anti-interference performance.

The invention discloses a PEDOT: PSS polymer, a preparation method and application thereof. The method comprises the following steps: the aqueous solution of polystyrene sulfonate and EDOT are mixed together and the solution is regulated to acidity, and the mixed solution is obtained; the mixed solution and the catalyst are mixed under the ultrasonic of a protective atmosphere with a frequency of20KHz-40KHz, and continues to be subjected to the ultrasonic treatment for 3-10min to obtain a reaction solution; the reaction solution is reacted at 5-30 DEG C for 5-24h, thereby the EDOT in the reaction solution is subjected to polymerization reaction to form PEDOT, the PEDOT and the polystyrene sulfonate are combined under the electrostatic action to obtain the PEDOT: PSS polymer. The method issimple, easy to operate, green and pollution-free. The prepared polymer has good dispersibility in water, and the particle diameter of the particles is moderate and the particle size is even. The prepared thin film has the advantages of high conductivity, strong bonding force and high stability of recycling, which can be used for organic electrochemical transistors, and has large initial source leakage current and good source leakage current regulation performance.

The invention relates to an all-solid-state organic electrochemical phototransistor and a preparation method thereof. The organic electrochemical phototransistor adopts a bottom gate planar structure,and the device includes a substrate, a solid electrolyte layer, an active layer, a source / drain electrode and a light absorbing layer from bottom to top; the solid electrolyte layer uses a polymer ion gel electrolyte and utilizes a spin coating or knife coating process to form a solid electrolyte layer on the substrate to achieve an all-solid-state organic electrochemical phototransistor. The all-solid-state organic electrochemical phototransistor provided by the invention achieves excellent optical response R and detection rate D under low voltage operation, and the characteristics of the all-solid-state phototransistor can be further integrated into advanced electronic and circuit systems, and the application field of the high performance electrochemical transistor is expanded. The all-solid-state organic electrochemical transistor is expected to be widely used in the fields of optical sensors, artificial synapses, and large-scale integrated circuits.

The invention discloses an organic electrochemical transistor sensor based on a molecular imprinted membrane, characterized in that a gate electrode of the organic electrochemical transistor sensor adopts a gold electrode modified with the molecular imprinted membrane, and the gate electrode is obtained by that an object to be detected is used as a template molecule, the template molecule is polymerized with a corresponding functional monomer by cyclic voltammetry to form a polymer membrane on the surface of the gold electrode firstly, and then the template molecule in the polymer template is eluted; and the gate electrode regulates and controls the channel current between a source electrode and a drain electrode through the solution of the object to be tested to constitute the organic electrochemical transistor sensor for selectively recognizing the object to be detected. The invention combines the molecular imprinting technique with the organic electrochemical transistor device, uses the specificity selection of the molecular imprinting technique and the signal amplification function of the organic electrochemical transistor sensor to recognize the specificity of the object to be detected, can selectively absorb the micro and even trace object to be detected, and has good selectivity, high sensitivity and low detection limit.

The invention discloses construction of an organic gate electrochemical transistor biosensor. The organic gate electrochemical transistor biosensor comprises a flexible substrate; two PEDOT / PSS films are arranged on the flexible substrate, one film is used as a channel material, and the other film is used as a gate electrode; one end of a channel material is a source electrode, and the other end is a drain electrode. The source electrode and the drain electrode are connected with one digital source meter, the source electrode and the gate electrode are connected with the other digital source meter, and then the sensor connected with the circuit is used for detecting the glucose concentration. The PEDOT / PSS film is obtained by adding a PEDOT / PSS aqueous solution into the dispersion liquid, filtering the PEDOT / PSS aqueous solution on the porous PVDF film in vacuum, drying and annealing. The PEDOT / PSS film is adopted as the gate electrode and the source-drain layer at the same time, the prepared organic electrochemical transistor shows high transconductance and high switch ratio, signal amplification is facilitated, and detection sensitivity is improved. The sensor disclosed by the invention is high in glucose concentration monitoring accuracy and good in sensitivity.

The invention discloses a non-invasive flexible sensor for detecting dopamine and a preparation method thereof, and relates to the technical field of biochemical sensing. The flexible sensor comprisesan organic electrochemical transistor having a carbon material-based gate electrode; the surface of a substrate of the gate electrode is modified by using a nanomaterial to increase the sensitivity of the gate electrode; and the surface of the substrate of the gate electrode is modified by using a polymer to increase the selectivity of the gate electrode. According to the flexible sensor, a carbon material is used as the gate electrode of a dopamine sensor of the organic electrochemical transistor, so that the cost is reduced; and the dopamine sensor of the organic electrochemical transistorworks under low gate electrode voltage, so that the power consumption of the device is reduced.

The present disclosure describes a systems and methods to rapidly detect a level of a drug present in a fluid sample. The systems and methods can be used to monitor drug levels in the blood of a patient to whom the drug has been prescribed. A system can include one or more organic electrochemical transistors that are functionalized with a coating that may include aptamers or antibodies. The coating can bind or otherwise interact with the drug of interest to change the transconductance of the organic electrochemical transistors. The system can detect a change in the transconductance of the organic electrochemical transistors and signal the presence of the drug.

The invention discloses blood coagulation function index detection test paper and a preparation and signal processing method thereof. The blood coagulation function index detection test paper comprises a substrate layer, a middle interlayer and a hydrophilic layer, wherein the middle interlayer is adhered between the substrate layer and the hydrophilic layer, the substrate layer is provided with an organic electrochemical transistor containing a reaction film for detecting blood coagulation function indexes, and the middle interlayer is provided with a sample introduction channel to the organic electrochemical transistor reaction region. The current change trend of the organic electrochemical transistor is used for reflecting blood coagulation states in different stages, and the current change time inflection point is determined by detecting the current change in different blood coagulation states, so that the detection of blood coagulation function indexes is realized. The invention further provides a signal processing method for improving the precision and accuracy of the test paper for measuring a blood coagulation function index, and reducing the difference of the performance of the test paper, which is influenced by the instability of the production process.

The invention provides a conductive composite fiber bundle, a preparation method thereof and an organic electrochemical transistor. The preparation method comprises the steps of immersing a fiber bundle in a dispersed carbon nanotube dispersion to form a compact carbon nanotube layer on the fiber bundle, and polymerizing 3,4-ethylenedioxythiophene in situ onto the carbon nanotube-treated fiber bundle through an inverse microemulsion method to obtain a uniform compact nanowire-like poly(3,4-ethylenedioxythiophene) conductive composite fiber bundle. The conductive composite fiber bundle obtainedcan be fitted to gel electrolyte to obtain a fiber-based organic electrochemical transistor. According to the preparation method, through the deposition of multi-walled carbon nanotubes on the surface of the fiber bundle and the advantages of inverse microemulsion, the PEDOT (poly(3,4-ethylenedioxythiophene)) polymerization process and the morphology are regulated and controlled, a regular transistor structure beneficial to electron transport and migration is formed, and the conductive composite fiber bundle-based organic electrochemical transistor prepared can be applied to the fields of wearable electronic devices, sensors and the like.

The invention belongs to the technical field of bioelectrochemical detection, and particularly relates to a flexible implantable fibrous organic electrochemical transistor and a preparation method thereof. A transistor source-drain electrode and a channel are prepared by taking a flexible polymer fiber as a substrate, and a transistor grid is prepared by taking a carbon nanotube fiber as a substrate and modifying an active substance; and the two are twisted by a twisting process to finally obtain the integrated fibrous organic electrochemical transistor. The flexible implantable fibrous organic electrochemical transistor can amplify a detection signal in situ in real time; stable detection of tiny concentration changes of chemical substances in various organisms is realized; the flexible implantable fibrous organic electrochemical transistor has the properties of high sensitivity, wide detection window, high stability and the like, can be implanted into deep tissue through minimally invasive surgery, is proved by histology and animal experiments to have excellent biocompatibility, and provides a new means for exploring biological basic physiological functions, uncovering a secret physiological mechanism and assisting in disease diagnosis and treatment.

The invention discloses an organic electrochemical transistor and a preparation method thereof. A conductive polymer nanowire array is distributed on a substrate; gold material electrodes serving as a source electrode and a drain electrode of the organic electrochemical transistor are arranged on the substrate and are located at two ends of the conductive polymer nanowire array; a liquid storage tank is arranged on the substrate; the conductive polymer nanowire array is arranged in a space defined by the liquid storage tank; electrolyte is injected into the liquid storage tank; the gold material electrodes are in insulated connection with the electrolyte; and a reference electrode serves as a grid electrode of the organic electrochemical transistor and is inserted into the electrolyte. The PEDOT: PSS nanowire array organic electrochemical transistor prepared by the method of the invention can be directly used for electrical testing and has good electrical properties. Compared with the performance of a traditional thin film type conductive polymer organic electrochemical transistor, the transconductance, muC *, response speed, stability and other properties of the organic electrochemical transistor are all superior. The preparation method is simple to operate and low in cost, and has the potential of large-scale application.

The invention provides a preparation method of layer-by-layer self-assembled semiconductor fiber and a transistor sensor. According to the layer-by-layer self-assembled semiconductor fiber, a fiber base material subjected to plasma treatment is circularly and alternately adsorbed in a poly(diallyldimethylammonium chloride) aqueous solution and a mixed solution of PEDOT:PSS and multi-walled carbon nanotubes in sequence, so that the n-layer self-assembled semiconductor fiber is prepared. The organic electrochemical transistor biosensor is formed by assembling the semiconductor fiber as a source and drain electrode and conductive fiber impregnated and adsorbed with a substance with a specific recognition effect as a grid electrode, so that the amplification function, sensing stability and sensitivity of a transistor can be improved, and the organic electrochemical transistor biosensor can be applied to various wearable electronic sensing fields.

The invention discloses an organic conjugated molecule containing a branched ether chain as well as preparation and application of the organic conjugated molecule. By introducing a branched ether-containing side chain to an organic conjugated molecule system, the solubility and ion affinity of the polymer are changed, the polymer can be processed by using fluoroalcohol solvents such as hexafluoroisopropanol, trifluoroethanol and the like, the toxicity of the solvents in the processing process is weakened, and electron transmission and ion transmission channels of the material are ensured at the same time. According to the organic conjugated polymer material containing the branched ether chain and an alcohol solvent processing mode, high electron mobility and volume capacitance of the material can be ensured at the same time, and the organic conjugated polymer material is applied to the field of organic electronics, including organic electrochemical transistors, organic electrochemical batteries and organic thermotropic power generation batteries, and has a wide application prospect. And excellent device sensitivity, stability and response speed can be obtained.

The invention relates to a polymer-based semiconductor fiber and preparation and application thereof. The preparation method comprises the steps that a conjugated semiconductor polymer is prepared into a spinning solution for wet spinning, wet spinning is conducted, spinning trickles extruded through a spinning nozzle sequentially enter a first coagulating bath and a second coagulating bath and then are dried, the dried fibers are collected, and the collected fibers are annealed to obtain polymer-based semiconductor fibers; and the surface and the interior of the fiber have pore structures, and the fiber also has an oriented structure. The breaking stress of the polymer-based semiconductor fiber reaches 700MPa; and the conductivity of the polymer-based semiconductor fiber is 1 * 10 <-12 > S cm <-1 >-13 S cm <-1 >, and the carrier mobility is 0.0001-100 cm < 2 > V <-1 > s <-1 >. The polymer-based semiconductor fiber is made into a fiber organic electrochemical transistor device, the transconductance of the device is remarkably improved, and the conversion efficiency of converting modulation of gate voltage (VG) into modulation of drain current (ID) flowing through the whole channel is remarkably improved.

The invention provides a flexible conductive composite material with a nano net-shaped and flower-shaped structure as well as a preparation method and application thereof. The preparation method comprises the following steps of loading a graphene oxide nanosheet on the surface of a flexible base material, and then reducing by a gas phase reduction method to obtain a reduced graphene oxide nanosheet which is loaded on the surface of the flexible base material and is of a fluffy scale and groove structure; and carrying out in-situ polymerization on the surface of the reduced graphene oxide nanosheet by taking the reduced graphene oxide nanosheet as a template to obtain a conductive polymer loaded on the surface of the reduced graphene oxide nanosheet. By means of the method, the conductive composite material distributed in a three-dimensional nanometer net-shaped and flower-shaped multilevel structure mode is obtained, the three-dimensional nanometer net-shaped structure is composed of aplurality of nanowires formed by compounding the reduced graphene oxide nanosheets and the conductive polymers, and the specific surface area is high; the migration rate of carriers and the exchangerate of ions can be improved, so that the electrical performance of the conductive composite material can be improved. The conductive composite material can be applied to the fields of sensors, capacitors, batteries and the like, and an organic electrochemical transistor with a high transconductance value can be obtained.

The invention belongs to the technical field of organic semiconductor materials, and particularly relates to a conductive polymer and a synthesis method and application thereof.The main chain structure of the conductive polymer is formed by polymerizing benzodiazole or benzotriazole serving as a basic repetitive unit and an Ar repetitive unit; the chemical stability and chemical modification property of repetitive units such as benzodiazole or benzotriazole are strong, so that the introduction of substituent groups or side chains is facilitated. Besides, by introducing an alkyl chain or an ethylene glycol side chain to thiophene connected with repetitive units such as benzodiazole or benzotriazole, the solubility of polymer molecules can be improved, and the obtained polymer can be dissolved in common solvents such as dichloromethane, chloroform and methylbenzene. The conductive polymer disclosed by the invention has the characteristics of definite structure, simplicity in synthesis and the like, can be applied to an organic semiconductor layer of an organic electrochemical transistor as a channel active material, and has good performance.

The invention relates to the field of sensors and in particular relates to a knittable fiber-based transistor glucose sensor and a preparation method of the knittable fiber-based transistor glucose sensor. The fiber-based transistor glucose sensor comprises an organic electrochemical transistor; the organic electrochemical transistor comprises a source-drain electrode and a grid electrode which is crossed with the source-drain electrode; gel electrolyte, which is used for stopping direct contact between the source-drain electrode and the grid electrode, is arranged at the crossed point of the source-drain electrode and the grid electrode; the source-drain electrode is a conductive high molecular composite material formed by polymerizing a flexible matrix material and a conductor monomer; the grid electrode is obtained by attaching glucose oxidase on the surface of the source-drain electrode through a fixing agent. The glucose sensor provided by the invention has relatively good flexibility, excellent sensing performance and relatively good anti-interference performance.

An organic electrochemical device including a substrate on which a source and drain are located, a gate electrode, and either a conductive channel of at least one organic conductive track or a conductive channel including at least one organic conductive track. Also, a method of manufacturing the organic electrochemical device.

The invention discloses an all-solid-state organic electrochemical transistor and a preparation method thereof, belongs to the field of flexible organic electrochemical transistors or synaptic electronics, and aims to solve the defects of inconvenience in large-scale integration, long-term application and portability of devices caused by liquid electrolyte in electrochemical transistors. An electrode layer and an ionic gel electrolyte layer; the electrodes comprise a source electrode, a drain electrode and a gate electrode; a plurality of porous semiconductor layers are arranged above the source electrode and the drain electrode, and an ionic gel electrolyte layer is arranged above the gate electrode; the ionic gel electrolyte layer formed by mixing the polymer and the ionic liquid according to the proportion is dripped on the multi-layer porous semiconductor film, so that the injection rate of electrolyte ions can be increased and the transconductance of the device can be optimized while the large contact area between the semiconductor active layer and the ionic gel electrolyte layer is ensured.

One embodiment provides an oscillator. The oscillator can include an organic electrochemical transistor, which comprises a channel and a dynamic gate. The channel can include one of: a conductive polymer, a conductive inorganic material, and a small-molecule material. An electrochemical potential of the dynamic gate can vary substantially periodically, thereby resulting in the organic electrochemical transistor having a drain current that varies substantially periodically.

The invention belongs to the technical field of organic semiconductor materials, and particularly relates to an indole diketone small molecule and a preparation method and application thereof, a novel indole diketone small molecule compound is synthesized through a very simple method, the synthesis method is simple and convenient, and the yield is high. The obtained compound has better dissolving property and absorption energy level, and compared with other polymer materials, the small molecule compound has the advantages of definite structure, high product purity and higher yield. The small molecular compound obtained by the simple method has a good planar rigid structure and good accumulation, is beneficial to transmission of electrons among molecules, and has potential application prospects in the fields of visible light, organic electrochemical transistors (OECT), organic thermoelectricity (OTE), organic field effect transistors and the like at the maximum absorption wavelength.

The biosensor comprises a silicon dioxide substrate, gold material electrodes serving as a source electrode and a drain electrode of the organic electrochemical transistor are arranged on the two sides of the silicon dioxide substrate, and a channel formed between the two gold material electrodes is coated with a diluted channel material PEDOT: PSS in a spinning mode. According to the method, the biosensor is manufactured by utilizing the specific ion electron transduction characteristic of the OECT, and through the time response of the device, on the premise that the preparation steps of the device are not increased, the yield of the device is improved, and the yield of the device is improved. And various ions are detected on the same device.

The invention provides a transistor and a method for detecting and / or determining the concentration of an analyte in a sample by using the transistor. The transistor comprises: a source electrode; a drain electrode; a channel comprising an organic semiconductor between the source electrode and the drain electrode; a plurality of gate electrodes; and an electrolyte, wherein the electrolyte contacts the gate electrodes and the channel, and wherein at least one gate electrode comprises an oxidoreductase and at least one gate electrode does not comprise an oxidoreductase, and methods for detecting and / or determining the concentration of an analyte in a sample using the transistor comprising: (i) applying a voltage to the at least one gate electrode which does not comprise an oxidoreductase; (ii) contacting the test sample in the transistor; (iii) applying the voltage used in (i) to the at least one gate electrode which comprises an oxidoreductase, (iv) removing the voltage from the at least one gate electrode which does not comprise an oxidoreductase; wherein (iii) and (iv) occur simultaneously.