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Stannic oxide based nanometer rod air-sensitive material and process for preparing the same

A technology of tin dioxide and gas-sensitive materials, which is applied in the directions of tin oxide, analytical materials, electrochemical variables of materials, etc., to achieve the effects of simple process, improved sensitivity and low cost

Inactive Publication Date: 2006-02-22
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

China Science and Technology Information Network released a message on January 13, 2004 that the National University of Singapore (The National University of Singapore) in Singapore successfully prepared tin dioxide (SnO 2 ) nanorods, but the nanorods are only suitable for lithium-ion rechargeable battery anode materials

Method used

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  • Stannic oxide based nanometer rod air-sensitive material and process for preparing the same
  • Stannic oxide based nanometer rod air-sensitive material and process for preparing the same
  • Stannic oxide based nanometer rod air-sensitive material and process for preparing the same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] Take 1 part of tin tetrachloride by net molar (part) ratio; 1.5 parts of urea; Prepare according to the following steps after 0.08 part of bismuth nitrate:

[0026] A) Mix tin tetrachloride and urea according to the above ratio, add distilled water to form a mixed solution, stir and keep warm in a water bath at 80°C (it can also be slightly higher, but preferably not more than 95°C), and obtain a milky precipitate;

[0027] B) bismuth nitrate is dissolved in dilute nitric acid, and ammonia water is added dropwise while stirring until a milky precipitate is formed;

[0028] C) The two precipitates obtained in steps A and B are mixed, washed repeatedly with deionized water, and then put into a drying box to dry;

[0029] D) After the dried particles are ground, they are pressed into flakes with a dry powder press, and annealed at 820° C. for 2 hours to obtain tin dioxide rod-shaped grain nanopowder (its appearance is as follows: figure 2 shown).

[0030] Using the resi...

example 2

[0034] Take by weighing 1 part of tin tetrachloride, 3 parts of urea, 0.12 part of bismuth nitrate by net molar (part) ratio, prepare by the same steps and order of example 1, difference is that the annealing temperature of step D) is 850 ℃, The annealing time is 1 hour. The appearance of the tin dioxide rod-shaped nanopowder prepared in this embodiment is as follows: image 3 shown.

[0035] Using the resistive gas sensor produced by the tin dioxide-based nanorod gas-sensitive material of this embodiment, the measured resistance (KΩ) value in air and the sensitivity variation parameters in 500ppm ethanol gas with heating voltage are shown in Table 2.

[0036] Table 2:

[0037]

example 3

[0039] Take by weighing 1 part of tin tetrachloride, 2 parts of urea, 0.1 part of bismuth nitrate by net molar (parts) ratio, prepare by the same steps and order of example 1, difference is that the annealing temperature of step D) is 800 ℃, The annealing time is 3 hours.

[0040] Using the resistive gas sensor produced by the tin dioxide-based nanorod gas-sensitive material of this embodiment, the measured resistance (KΩ) value in air and the sensitivity variation parameters in 500ppm ethanol gas with heating voltage are shown in Table 3.

[0041] table 3:

[0042]

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Abstract

This invention relates to one electro element materials by use of chemical or physical property analysis technique, which relates to one SnO2 nanometer bar sensitive material and its process method. The nanometer bar materials is composed by following weighted as mole: tin tetrachloride for one share; aquacare for 1.5 to 3 shares; bismuth nitrate for 0.08 to 0.12 shares for formulating, mixing, drying, pressing and pre-firing.

Description

field of invention [0001] The present invention relates to the technical field of testing or analyzing materials by means of measuring the chemical or physical properties of materials, in particular to a kind of electronic element material, especially to a kind of tin dioxide (SnO 2 )-based nanorod gas-sensing material and its preparation method. technical background [0002] Because tin dioxide-based nanomaterials have good gas-sensing properties, they are widely used in the manufacturing of gas sensors. In order to improve the sensitivity and selectivity, response speed and recovery time of this type of sensor, the research work done by researchers in the industry is mainly in the following aspects: ① Make the material particles as fine as possible, preferably made of nanomaterials, increase the Unit specific surface area to improve sensitivity; ② Make gas-sensitive materials into thin films to increase the contact area with gas and improve sensitivity; ③ Incorporate prec...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N27/407C01G19/02
Inventor 傅刚陈环张麟吕平
Owner GUANGZHOU UNIVERSITY
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