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Supersonic liquid phase reduction process for preparing monodisperse nano germanium crystal

A monodisperse and nanocrystalline technology, which is applied in the field of ultrasonic liquid phase reduction to prepare monodisperse germanium nanocrystals, can solve the problems of uneven particle size distribution, high cost, and harsh conditions for nanocrystalline materials, and achieve low cost and high conditions. Effects that are not harsh and the preparation method is simple

Inactive Publication Date: 2005-12-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Many methods for preparing Si and Ge nanocrystals have been proposed in the literature, including solid phase evaporation condensation, chemical vapor deposition (CVD), ion implantation, microemulsion method, and methods such as reducing Ge precursors with metal Na, Li, etc. The disadvantage of these methods is that the preparation of nanocrystals is carried out at high temperature and high pressure, or the amorphous particles prepared at low temperature are subjected to high temperature and high pressure heat treatment to obtain nanocrystals. The conditions for preparing nanocrystal materials are harsh, the cost is high, and the obtained nanoparticles The particle size distribution is uneven

Method used

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  • Supersonic liquid phase reduction process for preparing monodisperse nano germanium crystal
  • Supersonic liquid phase reduction process for preparing monodisperse nano germanium crystal
  • Supersonic liquid phase reduction process for preparing monodisperse nano germanium crystal

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Embodiment 1

[0032] According to the preparation process, the specific GeCl 4 Amount of 10ml 0.01mol / l THF solution, such as figure 1 The reducing agent shown in (a) is NaBH 4 10ml of 0.06mol / l ethanol solution; figure 1 The reducing agent shown in (b) is LiAlH 4 The consumption is the THF solution of 10ml 0.06mol / l; figure 1 (c) The reducing agent is 85% N 2 h 4 h 2 O solution 1ml. All the reactions were performed under the action of ultrasonic waves with an ultrasonic frequency of 40KHz for 30 minutes.

Embodiment 2

[0034] figure 2 (a) The sample is carried out according to the preparation process, using specific GeCl 4 The amount is 10ml of 0.01mol / l THF solution, using reducing agent NaBH 4 The dosage is 10ml of 0.06mol / l ethanol solution. The reaction was performed under the action of ultrasonic waves with an ultrasonic frequency of 50KHz for 30 minutes. figure 2 The reaction of (b) sample is carried out in the process of magnetic stirring at a stirring rate of 300r / min, using specific GeCl 4 The amount is 10ml of 0.01mol / l THF solution, and the reducing agent is NaBH 4 The specific dosage is 10 ml of 0.06 mol / l ethanol solution, and the reaction time is 30 minutes.

Embodiment 3

[0036] image 3 (a) The sample is carried out according to the preparation process, using specific GeCl 4 Amount of 10ml 0.01mol / l THF solution, reducing agent NaBH 4 The specific dosage is 10ml of 0.06mol / l ethanol solution. image 3 (b) using specific GeCl 4 The amount is 10ml of 0.1mol / l THF solution, and the reducing agent is NaBH 4 The specific dosage is 10ml of 0.6mol / l ethanol solution. All reactions were performed under ultrasound for 30 minutes.

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Abstract

The present invention is the process of utilizing metal hydride to reduce germanium chloride to prepare near monodisperse nanometer germanium crystal under supersonic reaction condition. The present invention has high energy supersonic water bath to replace high temperature reaction environment to promote the formation of nanometer crystal and the dispersion in the solution, and adopts strongly reductive metal hydride as reductant for preparing near monodisperse nanometer germanium crystal under room temperature condition. Through experiments, the nanometer germanium crystal preparing conditions are optimized. Preparing monodisperse nanometer germanium crystal is significant in research of the relationship between the performance and the size of nanometer material and is valuable in the design and manufacture of semiconductor devices.

Description

technical field [0001] The invention relates to the technical field of material preparation, in particular to a method for preparing monodisperse germanium nanocrystals through ultrasonic liquid phase reduction. Background technique [0002] Nanoscience and nanotechnology is currently one of the most dynamic fields of research, and interest in nanoparticles has increased dramatically over the past two decades. The purpose of the research is to "control the size of the material to obtain new properties". The large surface area and specific surface chemistry of nanoparticles have long been used to optimize the activity of catalysts. The size-dependent properties of magnetic nanoparticles have been widely used, such as in information storage technology. Nano-semiconductor particles have size-tunable optical properties and have been used in optoelectronic devices. Although nanoparticles have played an important role in the fields of information technology, electronics, medici...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 蒋建中吴海平刘金芳
Owner ZHEJIANG UNIV
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