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Preparation method of graphene complex based humidity sensor

A humidity sensor and composite technology, applied in the field of nanomaterials, can solve the problem that the graphene humidity sensor has not been reported, and achieve the effect of a simple method

Active Publication Date: 2010-08-04
上海碳源汇谷新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there is a certain basis for research on graphene-based biological and chemical sensors, there is still no report on graphene-based humidity sensors.

Method used

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  • Preparation method of graphene complex based humidity sensor
  • Preparation method of graphene complex based humidity sensor
  • Preparation method of graphene complex based humidity sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Dilute the concentration of polyvinylpyrrolidone-graphene composite aqueous solution made in the laboratory to 0.02mg / ml, and spread the composite on the surface of silicon oxide / silicon base in the form of a single-layer film by spin coating.

[0021] 2. A gold electrode with a thickness of 80nm is plated on the half surface of the monolayer film.

[0022] 3. Imaging in CAFM mode and determining the position of the measured sample.

[0023] 4. Adjust the relative humidity of the surrounding environment to 30%, 40%, 50%, 60%, 70%, 80%, and 90%, respectively, apply a bias voltage of 8V to the tested point through the probe, and perform I-V under different humidity curve measurement.

[0024] Such as figure 1 As shown, it is a schematic diagram of the sensor prepared in this embodiment, wherein: a gold electrode and a polyvinylpyrrolidone-graphene conductive film are used as two electrodes respectively, and after imaging based on the contact mode of the atomic force ...

Embodiment 2

[0028] 1. Dilute the concentration of polyvinylpyrrolidone-graphene composite aqueous solution made in the laboratory to 0.01mg / ml, and spread the composite on the surface of silicon oxide / silicon base in the form of a single-layer film by spin coating.

[0029] 2. Plating a layer of silver electrode with a thickness of 50nm on the half surface of the monolayer film.

[0030] 3. Imaging in CAFM mode and determining the position of the measured sample.

[0031] 4. Adjust the relative humidity of the surrounding environment to 30%, 40%, 50%, 60%, 70%, 80%, and 90%, apply a bias voltage of 1V to the tested point through the probe, and perform I-V curves under different humidity Measurement.

Embodiment 3

[0033] 1. Dilute the concentration of polyvinylpyrrolidone-graphene composite aqueous solution made in the laboratory to 0.05mg / ml, and spread the composite on the surface of silicon oxide / silicon base in the form of a single-layer film by spin coating.

[0034] 2. Plating a layer of silver electrode with a thickness of 100nm on the half surface of the monolayer film.

[0035] 3. Imaging in CAFM mode and determining the position of the measured sample.

[0036] 4. Adjust the relative humidity of the surrounding environment to 30%, 40%, 50%, 60%, 70%, 80%, and 90%, apply a bias voltage of 1V to the tested point through the probe, and perform I-V curves under different humidity Measurement.

[0037] During the preparation of the humidity sensor, the optimum concentration of the compound was determined to be 0.02 mg / ml by adjusting the concentration of the polyvinylpyrrolidone-graphene compound; in addition, by selecting different electrodes and their thicknesses, the best elect...

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Abstract

The invention discloses a preparation method of a graphene complex based humidity sensor in the technical field of nano materials. The humidity sensor is prepared through the following steps of: diluting a polyvinylpyrrolidone-graphene complex, coating on the surface of a substrate by spinning in the form of a single-layer film, electroplating a layer of metal electrodes on the single-layer film, and finally drying under vacuum. In the invention, by adopting the favorable hygroscopicity and the conductivity of the polyvinylpyrrolidone-graphene, a single-layer film of a humidity sensitive complex is formed on the surface of the substrate by using a spin coating method, and the sensitivity of the complex to the humidity is detected through an I-V curve measured by a conducting atomic force microscope at different humidities.

Description

technical field [0001] The invention relates to a device and a preparation method in the technical field of nanomaterials, in particular to a preparation method of a humidity sensor based on a single-layer polyvinylpyrrolidone-graphene composite. Background technique [0002] Graphene, also known as monoatomic layer graphite, is considered to be a zero-bandgap semiconductor. It has a series of unique electrical properties - room temperature Hall effect and high electron mobility, thermal conductivity, large specific surface area, etc., which has attracted widespread attention of researchers. Graphene is a two-dimensional crystal in the strict sense, and it is the most ideal material for preparing biochemical sensors. For example, Robinson et al published an article entitled "Reduced graphene oxide molecular sensors" (2008, 8, 3137-3140) on "Nanoletters" (Nano Letters), and they pointed out that using reduced graphene oxide With the characteristics of electrical conductivit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
Inventor 郭守武张佳利沈广霞王万君
Owner 上海碳源汇谷新材料科技有限公司
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