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Electrochemical sensor based on nanowire microelectrode

A nanowire and microelectrode technology, which is applied in the field of analysis and detection, can solve the problems that affect the detection accuracy of electrochemical sensors and the metal nanowires are easy to tear, and achieve the effects of simple structure, increased density and surface area, and stable structure

Active Publication Date: 2017-05-31
黄辉 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although metal nanowires or carbon nanotubes have high specific surface area and good current channels, carbon nanotubes are soft and easy to be entangled together, while metal nanowires are fragile and easy to tear; thus affecting the detection of electrochemical sensors Accuracy and other performance

Method used

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  • Electrochemical sensor based on nanowire microelectrode
  • Electrochemical sensor based on nanowire microelectrode

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0028] Such as figure 1 As shown, a kind of electrochemical sensor based on the nanowire microelectrode of the present embodiment, at first, on the surface of sapphire substrate 1, utilize chemical vapor deposition technique to grow one deck n-type GaN buffer layer 2; GaN single crystal nanowires (length 10 micrometers, diameter 100 nanometers) continue to grow on layer 2. Since the crystal orientation of GaN single crystal nanowires is consistent with that of the n-type GaN buffer layer 2, the growth direction of GaN single crystal nanowires remains consistent, forming a vertical and ordered nanowire array; finally, using magnetron sputtering coating technology, the The surface of the GaN single crystal nanowire is coated with a layer of platinum film (thickness is about 50 nanometers), and the preparation of the nanowire microelectrode of the electrochemical sensor is completed.

[0029] The GaN single crystal nanowires in this embodiment can maintain vertical and orderly g...

Embodiment 2

[0032] A kind of electrochemical sensor based on the nanowire microelectrode of the present embodiment, at first, on the surface of ZnO substrate, grow the ZnO single crystal nanowire array (length 100 micrometers, diameter 2 micrometers) of vertical order; Then, utilize magnetic Controlled sputtering coating technology, coating a layer of gold film (thickness 3 nanometers) on the surface of ZnO single crystal nanowires.

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Abstract

The invention relates to an electrochemical sensor based on a nanowire microelectrode. The electrochemical sensor based on the nanowire microelectrode comprises a nanowire microelectrode, wherein nanowires of the nano microelectrode are plated with a conductive film; the nanowires are semiconductor single crystal nanowire; the semiconductor single crystal nanowires are sequentially ordered into an array structure. The electrochemical sensor has the beneficial effects that as the semiconductor single crystal nanowires have the characteristics of being solid and ordered, mutual tangling of the nanowires can be avoided, and good stability and a large specific surface can be achieved; in addition, as the surfaces of the semiconductor nanowires are plated with the conductive film, the conductivity and the charge carrier collection property of the microelectrode can be improved. Compared with multi-crystal nanoparticles, the semiconductor single crystal nanowires has the effects that limitation and influence of grain boundary potential barrier in a polycrystalline material to current conduction can be eliminated, so that relatively smooth current channels can be achieved, and the conductivity can be improved.

Description

technical field [0001] The invention relates to the field of electrochemical sensors, in particular to electrochemical sensors based on nanowire microelectrodes, which can be used for analysis and detection in the fields of biology, medicine, diagnosis and treatment, analytical chemistry and the like. Background technique [0002] Electrochemical analysis is one of the most important methods in the field of biochemical analysis, and biosensors (such as blood glucose meters) based on electrochemical effects have been widely used [Sensors, 8 (2008) 1400-1458]. In order to improve the performance of electrochemical analysis, it is necessary to improve the material and structure of the electrode, such as the use of microelectrodes [Sensors, 15(2015) 22473-22489]. [0003] Microelectrodes have the advantages of small size (less destructive to active materials), fast stabilization (edge ​​effect produces three-dimensional diffusion), high signal-to-noise ratio (small charging curr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/48
CPCG01N27/30G01N27/48
Inventor 黄辉渠波白敏李雪晶
Owner 黄辉