47 results about "Scanning tunnel microscopy" patented technology

The invention discloses a low-temperature scanning tunneling microscope using a closed-cycle refrigerator to achieve refrigeration. The low-temperature scanning tunneling microscope comprises a closed-cycle refrigerator system, a helium heat exchange gas refrigeration vibration isolation interface system, a low-temperature scanning tunneling microscope scanning head system, a vacuum system, a vibration reduction platform and a scanning tunnel microscope control system. According to the low-temperature scanning tunneling microscope, under the condition that no liquid helium is consumed, atomic-scale resolution low-temperature ultrahigh-vacuum scanning tunnel microscopy space imaging and high-energy resolution scanning tunnel spectrum accurate measurement can be achieved like a liquid helium refrigeration system. The technical scheme of closed-cycle refrigeration can also be used for other applications needing lower temperature and low-vibration environments like other members of scanning probe microscope families. Large-range temperature changes can also be achieved through feedback combination of heating elements and temperature measuring elements.

The invention comprises the circuits and the electrolytic bath equipment. The circuit comprises the circuit for outputting power, the circuit of the braking part, the circuit of logical judgement and alarm part as well as the circuit of feeding back the change of the electrolytic bath. The electrolytic bath equipment comprises the identical left and right parts. A cantilever arm is welded on the one end of the two through tubes with another ends through nuts being fixed on the central shafts set up on the bottom seats. The cathode winding or anode tungsten filament is fixed on the end part of the two cantilever arms respectively. The alligator clips connected to the cathode and anode and clamp the upper part of the cathode and anode so as to become as the positive and negative electrode of the bath.

The invention provides a scanning head of a scanning tunneling microscope. The scanning head comprises a needle point bracket for fixing a needle point and a needle point bracket base comprising a supporting structure, wherein the needle point bracket is combined with the needle point bracket base through separable binding force. By the adoption of the scanning head of the scanning tunneling microscope, the needle point of the scanning head can be safely and quickly replaced in a vacuum environment, and an existing vacuum environment can not be damaged.

The invention relates to a method for measuring the relative absorption constants of molecules to be measured, such as dye, an antibody, a medicament, a medicament prosoma, and the like on polypeptide molecules by utilizing a STM (Scanning Tunneling Microscopy) technology. The method comprises the following steps of: acquiring an STM image of the self-assembly structure of the polypeptide molecules or acquiring an STM image of the co-assembly structure of polypeptide-labeled molecules through co-absorption with labeled molecules, adding molecules to be measured, such as the dye, the antibody, the medicament, the medicament prosoma, and the like to acquire the combination sites and the absorption quantity of the molecules to be measured on polypeptide and search the interaction of the polypeptide and the molecules to be measured on a molecule level; and measuring the relative absorption constants of the molecules to be measured on the polypeptide. The method provided by the invention is very significant to the analysis of the interaction mode and the combination essence of the target protein and the medicament.

The invention provides a preparation method for a scanning probe of a scanning tunneling microscope and a control circuit. The method comprises: oxidation film removing processing is carried out on a probe; a rubber gasket sleeve the probe of the probe with the diameter of 0.5mm, wherein the distance between the bottom of the rubber gasket and the bottom of the probe is 2mm; a metal filament loop is placed into a KOH solution with the concentration of 2 to 3 mol/L and the bottom of the probe is inserted into the liquid surface at the depth of 1mm; the probe serves as an anode and the metal filament loop serves as a cathode and voltages of 5 to 12 V are applied to the two ends; and when a first voltage of the anode is equal to a second voltage on a fixed resistor of a control circuit, the control circuit cuts off the circuit and thus the point of a needle is formed at the bottom of the probe. Besides, the control circuit consists of a relay, a fixed resistor, a cathode, and an anode, wherein the relay and the fixed resistor are connected with a single-chip microcomputer in series and the cathode and the anode are connected by using an electrolyte. According to the invention, the aspect ratio is controlled and the gravity is increased by using the rubber gasket and the control circuit cuts off the power supply automatically and detects the voltages in real time, so that the ideal probe point with the proper aspect ratio and the clear scanning pattern can be prepared by using a one-step corrosion method.

The invention discloses a method for controllably preparing self-assembled nano-flowers of p-type laminar gallium telluride nano-sheets under normal pressure. The method comprises the following process steps: a) preparing one layer of ZnO thin film with a nano-flower shape on a sapphire substrate and taking the ZnO thin film as a seed layer in a growth process of GaTe; b) putting a prepared precursor sample into a tubular furnace and forming the GaTe in a normal-pressure and high-purity argon gas environment; c) testing a synthesized material by utilizing characterization methods including a scanning tunneling microscope, Raman, photoluminescence, an atomic force microscope, a transmission electron microscope and the like. The shape of the GaTe gallium is controlled through the shape and growth conditions including time length, argon gas flow, temperature and the like of ZnO; the preparation of ZnO nano-flowers is controlled through adjusting conditions including gas flow, temperature and the like. The method is efficient and the synthesis is controllable; a heterojunction structure of the prepared GaTe/ZnO nano-flowers has a remarkable pn junction rectifying effect and can be used for producing hydrogen through photoelectric catalysis and the like; furthermore, the reference is also provided for the growth of a novel two-dimensional material GaTe.

The invention provides a nanoantenna scanning probe tip for microscropy or spectroscopy. The nanoantenna scanning probe tip includes a sharp probe tip covered with a contiguous film of predetermined sized and shaped plasmonic nanoparticles. A method for forming the nanoantenna scanning probe tip by trapping nanoparticles having a predetermined size and shape at a liquid surface using surface tension, forming a uniform and organized monolayer film on the liquid surface, and then transferring portions of the film to a sharp probe tip. In preferred embodiments, the sharp probe tip is one of a conductive STM (scanning tunneling microscopy) tip, a tuning fork tip or an AFM (atomic force microscopy) tip. The sharp tip can be blunted with an oxide layer.

A method for autonomously applying a dangling bond pattern to a substrate for atom scale device fabrication includes inputting the pattern, initiating a patterning process, scanning the substrate using a scanning probe microscope (SPM) to generate an SPM image of the substrate, feeding the SPM image into a trained convolution neural network (CNN), analyzing the SPM image using the CNN to identify substrate defects, determining a defect free substrate area for pattern application; and applying the pattern to the substrate in that area. An atom scale electronic component includes functional patches on a substrate and wires electrically connecting the functional patches. Training a CNN includes recording a Scanning Tunneling Microscope (STM) image of the substrate, extracting images of defects from the STM image, labeling pixel-wise the defect images, and feeding the extracted and labeled images of defects into a CNN to train the CNN for semantic segmentation.

This invention relates to bias current scanning channel spectrum meter or its microscopes, which is characterized by fixing probe on Z positioning device or XYZ end and sample rack onto base socket; detecting rack and sample position can be changed; the detector fixed on rack points to sample rack; the current source connects detector and sample channel to input voltage signals to buffer to output signals; the distance between sample and detector to test V-Z spectrum by alternating current source to test high voltage images by XYZ positioning device.

The invention discloses a method and device for realizing atomic-scale laser pumping detection. The method comprises the steps of triggering a first laser to emit a first laser pulse and a second laser to emit a second laser pulse based on an electric pulse, and adjusting the delay time between the first laser pulse and the second laser pulse; editing the waveform of the electric pulse to modulatethe delay time; combining and collimating the first laser pulse and the second laser pulse and irradiating an object to be detected; detecting the tunneling current signals of the irradiated object to be detected; and extracting a signal related to the delay time in the tunneling current signals. According to the invention, while signal modulation is realized, the laser average power in unit timeis ensured to be constant; therefore, the influence of the heat effect on a scanning tunneling microscope can be eliminated; the combination of the laser pumping detection technology and the scanningtunneling microscope technology is realized; and the atomic-scale spatial resolution and the nanosecond-scale time resolution can be obtained at the same time.

The invention relates to a tube-type approximation and imaging unit mechanical tandem type scanning tunneling microscope body. The tube-type approximation and imaging unit mechanical tandem type scanning tunneling microscope body comprises a base, a sliding rod, a sleeve and a spring piece, and is characterized by further comprising a first piezoelectric tube, a second piezoelectric tube and a probe bracket, wherein one end of the first piezoelectric tube is fixed on the base, and the other end is connected and fixed to the second piezoelectric tube in a tandem manner in the axial direction; the sleeve is concentrically and coaxially fixed to the deformation free end of the second piezoelectric tube; the spring piece exerts pressure in the radial direction of the sleeve to clamp the sliding rod to the inner wall of the guide rail; the sliding direction of the sliding rod is in the axial direction of the sleeve; and the probe bracket and the second piezoelectric tube are concentricallyand coaxially arranged, and one end of the probe bracket is fixed to a tandem connection position of the first piezoelectric tube and the second piezoelectric tube. The tube-type approximation and imaging unit mechanical tandem type scanning tunneling microscope body is highly compact in radial and axial structures, the second piezoelectric tube is further used for approximating low starting voltage capable of realizing a needle sample approximation step, high rigidity of the scanning unit is ensured, the main body is made of an insulating material, the cross section of the structure is free of a conductive loop, and the tube-type approximation and imaging unit mechanical tandem type scanning tunneling microscope body is particularly suitable for extreme physical conditions of extremely low temperature, strong/fast changing magnetic field and strong vibration.

The invention discloses a transfer vacuum sample holder. The sample holder comprises a second holder body assembly and a thermocouple, wherein the second holder body assembly is provided with a containing groove and a pair of second inserting grooves formed in the two opposite sides of the containing groove, and the two second inserting grooves are the same in extending direction and communicate with the containing groove; the thermocouple is fixed on the second holder body assembly and is positioned at a first end of an accommodating groove; the thermocouple extends to a lower part of the accommodating groove and is used for being in contact with a small sample holder when the two sides of the small sample holder in the width direction are inserted into second inserting grooves from second ends of the accommodating groove. The invention further discloses a vacuum interconnection system. The transfer vacuum sample holder has the function of allowing the small sample holder to be inserted and fixed, can be applied to a near-normal-pressure scanning tunneling microscope and a low-temperature scanning tunneling microscope at the same time, and can enable the thermocouple to be in automatic contact with the small sample holder after the small sample holder is inserted into the transfer vacuum sample holder, so detection of the temperature of a sample is achieved; transfer and vacuum interconnection of samples between two different scanning tunneling microscopes are realized.

The invention provides a novel scanning probe for a novel scanning tunneling microscope and a preparation method thereof. The scanning probe comprises a probe body. The probe body comprises a probe tip and a micro-cantilever bearing the probe tip, the micro-cantilever being provided with an upper surface and a lower surface corresponding to the upper surface, and the probe tip being connected to the position, close to the end, of the upper surface of the micro-cantilever; a metal conductive layer covering the upper surface of the micro-cantilever and the probe tip; an insulating layer coveringthe metal conductive layer; and a metal reflecting layer covering the lower surface of the micro-cantilever. The novel scanning probe is formed by introducing the insulating layer, feedback control over whether the scanning probe makes contact with a sample or not, the contact distance and the like can be achieved through atomic force, and the application field of the scanning tunneling microscope is widened.

The invention relates to a protein stretching sequencing platform with a two-dimensional plane heterostructure and a control method and a manufacturing method of the platform. The protein stretching sequencing platform with the two-dimensional plane heterostructure is formed by seamless splicing of MoS2 and WS2, a channel track of the WS2 is designed in advance, different chemical potentials of the WS2 and the MoS2 are utilized, original bent and folded protein molecules to be detected are stretched, and the protein molecules can be adsorbed on the WS2 nanometer channel due to the WS2 adsorption effect, such that the thermal fluctuation of the amino acid is substantially reduced, and the helical conformation of the detected protein can be substantially reduced; the stretched protein molecule conformation adsorbed on the two-dimensional surface is beneficial to protein sequencing by using a high-resolution atomic force microscope or a scanning tunneling microscope, and the signal-to-noise ratio is remarkably improved. If a nanopore single-molecule detection technology is combined, low-cost and high-throughput protein sequencing is expected to be realized.

A method for the patterning and control of single electrons on a surface is provided that includes implementing scanning tunneling microscopy hydrogen lithography with a scanning probe microscope to form charge structures with one or more confined charges; performing a series of field-free atomic force microscopy measurements on the charge structures with different tip heights, where interaction between the tip and the confined charge are elucidated; and adjusting tip heights to controllably position charges within the structures to write a given charge state. The present disclose also provides a Gibb's distribution machine formed with the method for the patterning and control of single electrons on a surface. A multi bit true random number generator and neural network learning hardware formed with the above described method are also provided.

A method of transferring a single metal atom from a first location to a second location on the surface of a metal oxide is disclosed. The method includes obtaining a material having a first metal atom deposited on a first oxygen atom vacancy of the metal oxide and transferring the first metal atom of the metal on the first oxygen atom vacancy to a second location on the metal oxide by applying a voltage to the first metal atom. The second location can be a second metal atom on a second oxygen atom vacancy of the metal oxide, where the first and second metal atoms form a first metal atom second metal atom species, or a metal atom of the metal oxide, where the first metal atom and the metal atom of the metal oxide forms a first metal atom metal atom of the metal oxide species.

The invention discloses a single-layer or several-single-layer CrTe3 film and a preparation method thereof. The thin film is of a single structure phase and is a magnetic semiconductor two-dimensional material, and the surface of the thin film shows a characteristic zigzag structure under a scanning tunneling microscope. According to the preparation method of the single-layer CrTe3 thin film, the single-layer CrTe3 thin film is prepared in a vacuum cavity by adopting a molecular beam epitaxy method. The single-layer CrTe3 thin film is easy to prepare, high in quality, uniform in component and smooth in surface. The invention further provides application of the single-layer CrTe3 thin film in a spinning electronic device, and the single-layer CrTe3 thin film has important application on miniaturization of the electronic device.

The invention discloses a preparation method of a water supramolecular motor. The method comprises steps that S1, highly-oriented pyrolytic graphite is adhered to a conductive metal plate by using low-temperature conductive silver adhesive, degassing is performed, then water molecules are deposited on a surface of the highly-oriented pyrolytic graphite in situ by using a microleakage valve at thetemperature of 90-110K, and self-assembling is performed to form a water cluster and a water molecular chain; S2, a graphite sample adsorbed with the water molecules is moved into a scanning tunnel microscope, the working environment is ultra-high vacuum, the temperature is 77 K, a needle tip of the scanning tunnel microscope is arranged above the water cluster, a voltage pulse is applied to inject tunneling electrons into the water cluster, and a negative electricity water cluster is formed; and S3, the negative electricity water cluster attracts a water molecular chain through electrostaticinteraction, the water molecular chain rotates clockwise or anticlockwise around the negative electricity water cluster under the driving of tunneling electrons, and the water supramolecular motor with the negative electricity water cluster as a stator and the water molecular chain as a rotor is obtained. The method is advantaged in that the water supramolecular motor can be prepared on a solid surface.

The invention discloses a scanning tunneling microscope and a sample holder thereof. According to one embodiment, the scanning tunneling microscope comprises a Beetle-type scanning head, and a sampleholder of the scanning tunneling microscope comprises a base made of an insulating material; a plurality of needle inserting clinohedrals, each needle inserting clinohedrals being made of a conductivematerial and being provided with an electrode, and the plurality of needle inserting clinohedrals being separated from one another and are fixed on the base. When a sample is arranged on the sample holder, the sample is electrically connected with at least one of the plurality of needle inserting clinohedrals through the electrode. Moreover, when the sample holder is inversely arranged on the Beetle-type scanning head, the needle inserting inclined surface of each needle inserting clinohedral is only in contact with a tungsten ball at the top of a corresponding scanning tube in a plurality ofscanning tubes of the Beetle-type scanning head. According to the embodiment of the invention, the multi-electrode design of the scanning tunneling microscope adopting the Beetle-type scanning head is realized.