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A gas molecule detector

A gas molecule and detector technology, applied in the field of sensors, can solve the problems of long response time and non-linear response, and achieve the effect of simple process, easy operation and improved responsivity

Active Publication Date: 2021-12-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Based on the above factors, the graphene oxide-based humidity detector does not have a good linear response, and the response time is very long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 1 As shown, by controlling the concentration of the graphene solution, the ultra-thin graphene oxide film with a size of 2mm is obtained by suction filtration at the AAO basement membrane by suction filtration; is 40%), with the graphene film face up, placed on the water surface, such as figure 1 a and 2a; press the AAO basement membrane, as figure 2 b, AAO basement membrane begins to sink, as figure 2 c, Finally, the AAO basement membrane sinks to the bottom of the cup, and the graphene membrane (inside the dotted circle) floats on the water surface, as shown in figure 1 b and 2d.

[0029] Use a porous silicon wafer to pick up the graphene film floating on the water surface from bottom to top, so that the graphene film is spread on the surface of the substrate, and after natural drying, as shown in Figure 8 As shown, the surface has a large number of wrinkles; its thickness is 4nm measured by atomic force microscope, as Figure 4 shown.

[0030]...

Embodiment 2

[0033] By controlling the concentration of the graphene solution, the ultra-thin graphene oxide film with a size of 2mm is obtained by suction filtration on the AAO basement membrane by suction filtration; the AAO basement membrane (porosity 60%) with the graphene oxide film attached to the surface , place the graphene membrane on the water surface, press the edge of the AAO basement membrane, the AAO basement membrane begins to sink, and finally, the AAO basement membrane sinks to the bottom of the cup, the graphene membrane floats on the water surface, and the graphene membrane successfully peel off.

[0034] Use a porous silicon wafer to pick up the graphene film floating on the water surface from bottom to top, so that the graphene film is spread on the surface of the substrate. After natural drying, a graphene film with surface wrinkles is obtained. The thickness of the graphene film is 14nm as measured by atomic force microscope. ,Such as Figure 5 shown.

[0035] The ...

Embodiment 3

[0038] By controlling the concentration of the graphene solution, the ultra-thin graphene oxide film with a size of 2mm is obtained by suction filtration on the AAO basement membrane by suction filtration; the AAO basement membrane (porosity 60%) with the graphene oxide film attached to the surface , place the graphene membrane on the water surface, press the edge of the AAO basement membrane, the AAO basement membrane begins to sink, and finally, the AAO basement membrane sinks to the bottom of the cup, the graphene membrane floats on the water surface, and the graphene membrane successfully peel off.

[0039] Use a porous silicon wafer to pick up the graphene film floating on the water surface from bottom to top, so that the graphene film is spread on the surface of the substrate. After natural drying, a graphene film with surface wrinkles is obtained. The thickness of the graphene film is 57nm as measured by atomic force microscope .

[0040] The graphene oxide film locate...

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Abstract

The invention discloses a gas molecular detector. The detector is based on an ultra-thin graphene film to realize detection. The ultra-thin graphene film is obtained by the following method: AAO base film with a graphene film attached to the surface Place the graphene film on the water surface with the graphene film facing up; press the AAO base film to make the AAO base film sink, and the graphene film floats on the water surface. The exfoliated graphene film is not damaged in any way, and maintains its original shape, structure and performance on the AAO base film. At the same time, there is no damage to the AAO basement membrane and can be reused. Due to the small thickness of the graphene film, below 60nm, even up to several nanometers, this detector has extremely high sensitivity.

Description

technical field [0001] The invention relates to the field of sensors, in particular to a gas molecule detector. Background technique [0002] Since 2010, graphene and its derivatives have attracted attention from various fields due to their excellent physical and chemical properties. Graphene oxide is the most important precursor for the preparation of graphene, and it also has its own unique physical properties, with a large number of defects, oxygen-containing functional groups, etc., so it has high optical transparency, high hydrophilicity, high band Gap and so on. Based on this, it has received extensive attention in humidity detection. [0003] At present, graphene oxide mainly uses methods such as drop coating, spin coating, and spraying in humidity detection. This method has the following disadvantages: first, the surface structure is uncontrollable; second, the uniformity is uncontrollable; third, the thickness is uncontrollable; Fourth, the internal structure of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12C01B32/184
CPCC01B32/184G01N27/121G01N27/127
Inventor 高超方文章沈颖俞丹萍彭蠡卡西克燕·戈坡塞米
Owner ZHEJIANG UNIV