Appearance-controllable indium oxide powder and low-temperature hydrothermal synthesis method thereof

A hydrothermal synthesis and indium oxide technology, applied in chemical instruments and methods, gallium/indium/thallium compounds, inorganic chemistry, etc., can solve the problems of difficult distribution control, material structure easy to collapse, and limited effective sites of materials

Active Publication Date: 2017-09-08
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the effective sites of the loaded material are limited, and it is difficult to control the distribution of the loaded elements
The two-step method can reduc

Method used

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  • Appearance-controllable indium oxide powder and low-temperature hydrothermal synthesis method thereof
  • Appearance-controllable indium oxide powder and low-temperature hydrothermal synthesis method thereof
  • Appearance-controllable indium oxide powder and low-temperature hydrothermal synthesis method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] (1) Preparation of indium source prepolymer solution

[0069] 3.06g of In(NO 3 ) 3 4.5H 2 O was dissolved in distilled water and adjusted to 100 mL to obtain a 0.08 mol / L indium source aqueous solution. Take 25mL of 0.08mol / L indium source aqueous solution, add 25mL of distilled water, and then add + Nitric acid aqueous solution with a concentration of 2.0 mol / L was used to adjust the pH value of the solution to =1, and magnetically stirred at 80° C. for 30 minutes to obtain an indium source prepolymer solution A.

[0070] (2) Preparation of alkali source prepolymer solution

[0071] Dissolve 1.8g of urea granules in distilled water to a volume of 50mL, add + Aqueous nitric acid solution with a concentration of 2.0 mol / L was used to adjust the pH of the solution to 1, and magnetically stirred at 80° C. for 30 minutes to obtain alkali source prepolymer solution B.

[0072] (3) Preparation of indium hydroxide precursor

[0073] Mix the indium source prepolymer solu...

Embodiment 2

[0077] (1) Preparation of indium source prepolymer solution

[0078] Take 1.33g of PAA original solution (mass fraction 30%) and dissolve it in distilled water to make up to 1L, and prepare PAA aqueous solution 1 with a concentration of 0.4g / L. 3.06g of In(NO 3 ) 3 4.5H 2 O was dissolved in distilled water to 100 mL to obtain 0.08 mol / L indium source aqueous solution 2. Take 25mL of 0.08mol / L indium source aqueous solution and add it to 25mL PAA aqueous solution 1, add + Nitric acid aqueous solution with a concentration of 2.0 mol / L was used to adjust the pH value of the solution to =1, and magnetically stirred at 80° C. for 30 minutes to obtain an indium source prepolymer solution A.

[0079] (2) Preparation of alkali source prepolymer solution

[0080]1.33 g of the PAA original solution (30% by mass) was dissolved in distilled water to make up to 1 L, and PAA aqueous solution 3 with a concentration of 0.4 g / L was prepared. Dissolve 1.1 g of SDS in distilled water and m...

Embodiment 3

[0086] (1) Preparation of indium source prepolymer solution

[0087] Take 3.33 g of PAA original solution (mass fraction 30%), add distilled water to make up to 1 L, and prepare water PAA solution 1 with a concentration of 1.0 g / L. 3.06g of In(NO 3 ) 3 4.5H 2 O was dissolved in distilled water to 100 mL to obtain 0.08 mol / L indium source aqueous solution 2. Add 25mL indium source aqueous solution 2 into the 25mL PAA aqueous solution 1, add H + Nitric acid aqueous solution with a concentration of 2.0 mol / L was used to adjust the pH value of the solution to =1, and magnetically stirred at 80° C. for 30 minutes to obtain an indium source prepolymer solution A.

[0088] (2) Preparation of alkali source prepolymer solution

[0089] Take 3.33 g of PAA original solution (mass fraction 30%), add distilled water to make up to 1 L, and prepare PAA aqueous solution 3 with a concentration of 1.0 g / L. Dissolve 1.1 g of SDS in distilled water and make up to 1 L to prepare water SDS so...

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Abstract

The invention relates to an appearance-controllable indium oxide powder and a low-temperature hydrothermal synthesis method thereof and belongs to the technical field of inorganic chemical synthesis. The low-temperature hydrothermal synthesis method comprises the following steps: taking indium nitrate or indium chloride as an indium source, urea as an alkaline source, nitric acid or hydrochloric acid as a hydrolysis inhibitor and polyacrylic acid (PAA) and sodium dodecyl sulfonate (SDS) as a double template agent, and reacting for 8-12 hours under a hydrothermal condition at 80-95 DEG C; performing suction filtration and washing a product, and roasting to obtain In2O3 power. Cubic, flower-shaped, spherical and hollow spherical products formed by primary particles as In2O3 single crystals can be obtained by regulation and control of PAA and SDS consumption; the obtained In2O3 power belongs to a cubic crystal system. The obtained products are made into a side heat type gas sensor element for gas sensitive performance detection; when the working temperature of a device made of the cubic In2O3 power is 100 DEG C, the gas-sensitive property of 100-ppm nitromethane is good, a sensitivity value is higher than 500, the response time is about 1-2 s, and the quick detection on flammable and explosive nitromethane gas at a relatively low temperature can be realized.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical synthesis, and in particular relates to an indium oxide powder with controllable morphology and a low-temperature hydrothermal synthesis method thereof. The indium oxide powder can be used in the fields of gas-sensitive materials and the like. Background technique [0002] Indium oxide (In 2 o 3 ), it is a light yellow powder crystal at room temperature, and the crystal form is mainly cubic (c-In 2 o 3 ) and hexagonal (h-In 2 o 3 ). In the internal structure of its crystal, there are many interstitial ions and oxygen vacancies, which provide many physical adsorption, chemical adsorption, reaction and conversion sites and electron transfer channels. Will In 2 o 3 The research on the use of materials for gas-sensing materials originated in the 1990s. In recent years, through continuous exploration by researchers, it has been used in NH 3 , Cl 2 、C 2 h 5 OH, NO x , O 3 、H 2 ...

Claims

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Application Information

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IPC IPC(8): C01G15/00G01N33/00B82Y40/00
CPCB82Y40/00C01G15/00C01P2002/01C01P2002/72C01P2004/03C01P2004/16C01P2004/32C01P2004/34C01P2004/38C01P2004/45C01P2004/61C01P2004/62C01P2004/64G01N33/0036G01N33/0047
Inventor 赵旭东张延鲁
Owner JILIN UNIV
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