Nanocellulose graphene quantum dot high-sensitivity humidity sensor and green preparation process thereof

A technology of graphene quantum dots and nanocellulose, which is applied in nanotechnology, nanotechnology, nanotechnology for sensing, etc., can solve the problem of affecting the response sensitivity of humidity sensors, low adhesion of humidity sensitive films, and metal films. Easy to be oxidized and other problems to achieve the effect of promoting water molecule conduction, avoiding damage, and improving stability

Pending Publication Date: 2020-12-11
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing related research proposes to prepare graphene oxide quantum dot humidity sensor by spin-coating method, which can achieve sub-second response, but the adhesion of the humidity-sensitive film is not high, and it is easily disturbed by external environmental factors, which in turn affects the response sensitivity of the humidity sensor. sex
In addition, there are also studies using interdigitated electrodes to assemble humidity sensors, but due to the cumbersome preparation process, and the metal film on the electrodes is easily oxidized, which weakens its conductivity and affects long-term test stability.

Method used

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  • Nanocellulose graphene quantum dot high-sensitivity humidity sensor and green preparation process thereof
  • Nanocellulose graphene quantum dot high-sensitivity humidity sensor and green preparation process thereof
  • Nanocellulose graphene quantum dot high-sensitivity humidity sensor and green preparation process thereof

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Effect test

Embodiment 1

[0072] A green preparation process for a nanocellulose graphene quantum dot high-sensitivity humidity sensor, comprising the following steps:

[0073] Step 1. After mixing the nanocellulose and graphene quantum dots, perform ultrasonic dispersion to obtain a dispersion liquid; mix polydimethylsiloxane with the obtained dispersion liquid evenly to obtain a mixed dispersion liquid; pass the obtained mixed dispersion liquid through a vacuum Freeze-drying to prepare a porous composite moisture-sensitive membrane;

[0074] Step 2, evenly coating polydimethylsiloxane on the left and right sides of the porous composite moisture-sensitive membrane, the upper and lower sides of the porous composite moisture-sensitive membrane form a sensing surface;

[0075] Step 3, sticking the nanocellulose carbon nanotube composite membrane to the left and right sides of the porous composite humidity sensitive membrane to form flexible electrodes;

[0076] Step 4: Connect the wires used to connect ...

Embodiment 2

[0079] In the green preparation process of the nanocellulose graphene quantum dot high-sensitivity humidity sensor, it specifically includes:

[0080] Step A, preparing a nanocellulose dispersion with a concentration of 1 to 50 mg / ml, and a graphene quantum dot dispersion with a concentration of 1 to 20 mg / ml;

[0081] Step B, performing high-efficiency ultrasonic dispersion on the nanocellulose dispersion and the graphene quantum dot dispersion respectively for 5 to 60 minutes to obtain a uniform nanocellulose dispersion and graphene quantum dot dispersion;

[0082] Step C, mixing the uniform nanocellulose dispersion and the graphene quantum dot dispersion in a certain proportion, ultrasonically dispersing for 20 to 120 minutes at an ultrasonic power of 400 to 1200 W, to obtain a uniformly dispersed nanocellulose graphene quantum dot dispersion; Wherein, graphene quantum dots account for 0.5-100wt.% of the total dry weight of nanocellulose and graphene quantum dots;

[0083]...

Embodiment 3

[0090] A nanocellulose graphene quantum dot high-sensitivity humidity sensor is prepared, comprising the steps of:

[0091] (1) Prepare a nanocellulose dispersion with a concentration of 13 mg / mL and a graphene quantum dot dispersion with a concentration of 2 mg / mL.

[0092] (2) The nanocellulose dispersion is subjected to high-efficiency ultrasonic dispersion for 15 minutes to obtain a uniform nanocellulose dispersion; at the same time, the concentration of the corresponding graphene quantum dot dispersion is configured.

[0093] (3) The nanocellulose dispersion liquid and the graphene quantum dot dispersion liquid are mixed in a certain proportion, and ultrasonically dispersed for 50 min under ultrasonic power 1200W, finally obtaining a uniformly dispersed nanocellulose graphene quantum dot mixed dispersion liquid; wherein , the graphene quantum dots account for 20wt.% of the total dry weight of both the nanocellulose and the graphene quantum dots.

[0094] (4) Add a certain ...

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Abstract

The invention discloses a nanocellulose graphene quantum dot high-sensitivity humidity sensor and a green preparation process thereof. The nanocellulose graphene quantum dot high-sensitivity humiditysensor comprises a porous composite humidity-sensitive film prepared by mixing nanocellulose, graphene quantum dots and polydimethylsiloxane in proportion, and the porous composite humidity-sensitivefilm forms a sensing surface; a polydimethylsiloxane layer coats the side part of the porous composite humidity-sensitive film; a flexible electrode is adhered to the side part of the porous compositehumidity-sensitive film through the polydimethylsiloxane layer; and a wire is connected to the flexible electrode. A sensing medium layer of the humidity sensor is a porous composite humidity-sensitive film prepared from nanocellulose, graphene quantum dots and polydimethylsiloxane, and the nanocellulose and the graphene quantum dots are combined in a staggered mode to form a flexible three-dimensional porous network structure with a large specific surface area. The polydimethylsiloxane improves the stability of the porous network structure, so that the conduction and permeation of water molecules on the surface of the composite humidity-sensitive film are effectively promoted, and the sensitivity and sensing performance of the sensor are improved.

Description

technical field [0001] The present invention relates to the technical field of biomass nanomaterials, more specifically, the present invention relates to a nanocellulose graphene quantum dot high-sensitivity humidity sensor with high sensitivity, flexibility, three-dimensional porosity, sensitive sensing, and high humidity detection accuracy and its green preparation craft. Background technique [0002] In the fields of industrial intelligent production, dangerous goods storage and transportation, agriculture and forestry breeding, wearable smart electronic equipment, meteorological remote sensing test, cultural relics protection, health monitoring and other fields, the humidity sensors used are required to have higher accuracy and sensitivity, faster response / Recovery behavior and good long-term use stability. [0003] Nanocellulose has good stability, biocompatibility, flexibility and excellent self-assembly performance. There are a large number of oxygen-containing grou...

Claims

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Application Information

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IPC IPC(8): G01N27/22B82Y15/00B82Y40/00
CPCB82Y15/00B82Y40/00G01N27/225
Inventor袁全平杨雨桐苏国婷李启林朱子飘刘少冉
OwnerGUANGXI UNIV