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Method for preparing monodisperse stannic oxide nanocrystalline particles

A technology of tin dioxide and nanocrystals, which is applied in the fields of nanomaterial preparation, catalysts, gas sensors and electrode materials, can solve the problems of high energy consumption and complicated preparation process, and achieve large specific surface area, simple preparation process, and easy large-scale The effect of large-scale industrial production

Inactive Publication Date: 2014-03-05
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional hydrothermal synthesis method needs to prepare monodispersed tin dioxide nanoparticles by means of surfactants. Due to the introduction of surfactants, the purity of the prepared tin dioxide particles is not high, and must be further processed through follow-up ( For example, high-temperature calcination) to obtain high-purity, monodisperse tin dioxide nanoparticles (Y.D.Wang.; C.L.Ma.; X.D.Sun.; H.D.Li. Nanotechnology, 2002, 13, 565), high energy consumption, complex preparation process

Method used

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  • Method for preparing monodisperse stannic oxide nanocrystalline particles
  • Method for preparing monodisperse stannic oxide nanocrystalline particles
  • Method for preparing monodisperse stannic oxide nanocrystalline particles

Examples

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Embodiment 1

[0027] In this example, SnCl 4 ·5H 2 O is the raw material, benzimidazole is used as the mineralizer, and the mixed solution of water and ethanol is used as the solvent, and reacted at 180°C for 20 hours to obtain monodisperse, large specific surface area, and high-purity tin dioxide nanocrystalline particles. The specific process steps include:

[0028] (1) Mix 20mL deionized water and 20mL ethanol evenly as a solvent, and 0.35g SnCl 4 ·5H 2 O and 0.1g benzimidazole are also dissolved in a solvent to obtain a mixed solution;

[0029](2) Transfer the obtained mixed solution to a 50mL polytetrafluoroethylene-lined stainless steel reaction kettle, and react at 180°C for 20h to obtain a white sample;

[0030] (3) Wash the obtained white sample with deionized water and ethanol in sequence, and then dry it in air at 100°C to obtain monodisperse SnO with an average diameter of about 3.4nm. 2 Spherical nanocrystalline particles with a specific surface area of ​​223.6m 2 g -1 ,...

Embodiment 2

[0032] In this example, the amount of benzimidazole used is 0.3 g, and other experimental conditions are the same as in Example 1, and an ellipsoidal monodisperse SnO 2 Nanocrystalline particles, the average long diameter is 7.4nm, the average short diameter is about 4.8nm, and the specific surface area is 181.2m 2 g -1 , the pore size is 6.4nm.

Embodiment 3

[0034] In this embodiment, the amount of benzimidazole used is 0.6g, and other experimental conditions are the same as in Example 1. The prepared SnO 2 Aggregation of nanocrystalline particles occurs, the particles are spherical, the average diameter is about 5.2nm, and the specific surface area is 109.7m 2 g -1 , Compared with Examples 1 and 2, the specific surface area obviously decreases; the pore diameter is 4.3nm.

[0035] This example regulates the amount of SnO by adjusting the amount of mineralizer benzimidazole 2 The particle size and morphology of nanocrystals, under the control of benzimidazole, the prepared SnO 2 Nanoparticles have the advantages of uniform size, good monodispersity, high crystallinity, and large relative area, and have potential applications in the fields of catalysts, gas sensors, and electrode materials.

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Abstract

The invention belongs to the technical field of preparation of nano materials and relates to a method for preparing monodisperse stannic oxide nanocrystalline particles. The method comprises the following steps: uniformly mixing deionized water with ethanol or isopropanol to serve as a solvent, and then respectively dissolving SnCl4.5H2O and benzimidazole in the solvent to obtain a mixed solution; transferring the mixed solution into a stainless steel reaction kettle lined with polytetrafluoroethylene to react to obtain a white sample; and then, sequentially cleaning the white sample with deionized water and ethanol, and drying to obtain the monodisperse stannic oxide nanocrystalline particles; the preparation method is simple in preparation process, simple and convenient to operate, reliable in principle, low in production cost, high in product yield and is environmental-friendly, and the prepared nanocrystalline particles are small in size, good in monodispersity, large in specific surface area and high in purity, has a wide application prospect on the aspects of gas sensors and can be put into large-scale industrial production easily.

Description

Technical field: [0001] The invention belongs to the technical field of nanomaterial preparation, and relates to a process for controllably preparing large specific surface area and monodisperse tin dioxide nanocrystal particles by using benzimidazole as a mineralizer, in particular to a monodisperse tin dioxide nanocrystal particle The preparation method can be used in the fields of catalyst, gas sensor, electrode material and the like. Background technique: [0002] Tin dioxide is a wide bandgap semiconductor oxide (bandgap width is 3.6eV), there are oxygen vacancies in the actual synthesis process, showing n-type semiconductor characteristics, tin dioxide has unique gas sensitivity, conductivity and Light transmittance, has broad application prospects in the fields of optoelectronics and gas sensors, and its potential application value has attracted widespread attention. Monodisperse nano-sized tin dioxide crystal particles have large specific surface area and high activi...

Claims

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Application Information

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IPC IPC(8): C01G19/02B82Y30/00
Inventor 王凤云王乙潜蔡镕声王超
Owner QINGDAO UNIV
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