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Three-dimensional In2O3/SnO2 core-shell nanocomposite for detecting formaldehyde gas and gas sensor prepared therefrom

A nanocomposite material and gas sensor technology, applied in the field of semiconductor nanomaterials, can solve the problems of insufficient sensitivity of formaldehyde gas, insufficient detection limit, high working temperature, etc., to achieve improved sensitivity and selectivity, low cost and good stability Effect

Active Publication Date: 2019-06-04
UNIV OF SHANGHAI FOR SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is aimed at the defects of the existing formaldehyde gas sensor that the sensitivity to formaldehyde gas is not high enough, the lower detection limit is not low enough, the selectivity is relatively poor, the working temperature is too high and the stability is poor, the main purpose of the present invention to provide a three-dimensional In 2 o 3 / SnO 2 core-shell nanocomposites

Method used

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  • Three-dimensional In2O3/SnO2 core-shell nanocomposite for detecting formaldehyde gas and gas sensor prepared therefrom
  • Three-dimensional In2O3/SnO2 core-shell nanocomposite for detecting formaldehyde gas and gas sensor prepared therefrom
  • Three-dimensional In2O3/SnO2 core-shell nanocomposite for detecting formaldehyde gas and gas sensor prepared therefrom

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of three-dimensional In 2 o 3 / SnO 2 Core-shell nanocomposite material, its specific steps are as follows:

[0034] (1) with In(NO 3 ) 3 4.5H 2 O is the raw material, take 0.8gIn(NO 3 ) 3 4.5H 2 Dissolve O in a beaker containing a mixed solution of 4mL DMF and 6mL ethanol, add a magnet and place it on a magnetic stirrer to stir for 1h. After the solution becomes clear and transparent, slowly add 1gPVP and continue stirring for 12h to make it a clear and transparent viscous liquid . After completion, collect it into a 10mL syringe for use.

[0035](2) Put the syringe with the above-mentioned solution into the electrospinning machine, and set the relevant parameters as follows: the temperature inside the spinning machine is 45°C, the relative humidity is 20%, the voltage of the collecting plate and the needle tip of the syringe is adjusted to 18kV, The distance between the collection plate and the syringe needle was set at 15 cm. After the electrosp...

Embodiment 2

[0044] Preparation of three-dimensional In 2 o 3 / SnO 2 Core-shell nanocomposite material, its specific steps are as follows:

[0045] (1) With embodiment 1.

[0046] (2) With embodiment 1.

[0047] (3) 100mgIn 2 o 3 Add nanofibers to the above solution, and at the same time transfer the solution in the beaker to a 180mL reactor and place it in an oven at 180°C for hydrothermal reaction for 6 hours. After the reaction is over, wash the obtained precipitate three times with water and ethanol respectively. , and placed in a 60°C drying oven to dry overnight. After drying, the samples were collected and calcined at a heating rate of 2°C / min to 500°C and kept at a temperature of 2h.

[0048] From the above three-dimensional In 2 o 3 / SnO 2 The specific steps for preparing the gas sensor from the core-shell nanocomposite are the same as in Example 1.

Embodiment 3

[0050] Preparation of three-dimensional In 2 o 3 / SnO 2 Core-shell nanocomposite material, its specific steps are as follows:

[0051] (1) With embodiment 1.

[0052] (2) With embodiment 1.

[0053] (3) 100mgIn 2 o 3 Add nanofibers to the above solution, and at the same time transfer the solution in the beaker to a 180mL reactor and place it in a 180°C oven for hydrothermal reaction for 18 hours. After the reaction is over, wash the obtained precipitate three times with water and ethanol respectively. , and placed in a 60°C drying oven for overnight drying. After drying, the samples were collected and calcined at a heating rate of 2°C / min to 500°C and kept for 2 hours to obtain the product.

[0054] From the above three-dimensional In 2 o 3 / SnO 2 The specific steps for preparing the gas sensor from the core-shell nanocomposite are the same as in Example 1.

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Abstract

The invention discloses a three-dimensional In2O3 / SnO2 core-shell nanocomposite for detecting formaldehyde gas and a gas sensor prepared therefrom, a three-dimensionally-classed core-shell heterojunction structure is obtained by taking In2O3 nanofiber as a skeleton and uniformly growing a uniform SnO2 nanosheet array on the fiber surface by a hydrothermal method; the obtained three-dimensional In2O3 / SnO2 core-shell nanocomposite is mixed with ethanol and stirred into a paste, and is uniformly applied to the surface of an alumina ceramic tube with gold electrodes at both ends, welding, aging and encapsulation are performed according to a heater-type semiconductor gas sensor, a formaldehyde gas sensor is prepared, the formaldehyde gas sensor has high sensitivity to the formaldehyde gas, goodselectivity to an interference gas, good stability, and low working temperature, and can be used for indoor detection of the formaldehyde gas in the living environment, and the concentration of the detected formaldehyde gas is 0.1 to 500 ppm.

Description

technical field [0001] The invention belongs to the technical field of semiconductor nanomaterials, relates to a novel formaldehyde gas detection material and a gas sensor, in particular to a three-dimensional In 2 o 3 / SnO 2 Core-shell nanocomposite material and gas sensor made from it. Background technique [0002] In recent years, real-time and effective detection of various toxic chemical gases has become a research hotspot due to their potential harm to human body and environment. Formaldehyde is a colorless and toxic gas that widely exists in living environments such as homes, offices, and cars. It is very harmful to human health. Inhaling a small amount of formaldehyde gas (2ppm) in a short period of time can cause serious health problems, such as nausea ( 0.2-1.9ppm), tearing (4-20ppm), pulmonary edema, sneezing, coughing, and nausea. Long-term exposure to high concentrations of formaldehyde gas will lead to various degrees of damage to various organs in the body...

Claims

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Application Information

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IPC IPC(8): C01G15/00C01G19/02G01N27/12
Inventor 王丁万克创杨家林赖云程宇王现英杨俊和
Owner UNIV OF SHANGHAI FOR SCI & TECH
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