Chem. J. Chinese Universities ›› 2026, Vol. 47 ›› Issue (1): 20250296.doi: 10.7503/cjcu20250296

• Article • Previous Articles     Next Articles

One-step Preparation of Au/Mesoporous Silica Composite Particles

HAN Yandong1, YANG Wensheng1,2()   

  1. 1.Engineering Research Center for Nanomaterials,Henan University,Kaifeng 475000,China
    2.State Key Laboratory of Inorganic Synthesis and Preparative Chemistry,College of Chemistry,Jilin University,Changchun 130012,China
  • Received:2025-10-15 Online:2026-01-10 Published:2025-11-26
  • Contact: YANG Wensheng E-mail:wsyang@jlu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21773089);the Scientific and Technological Project in Henan Province

Abstract:

In this work, choline was employed as both a catalyst and a reducing agent to catalyze the hydrolysis/ condensation of tetraethyl orthosilicate and reduce chloroauric acid tetrahydrate. Through a one-step concerted reaction process, successfully prepared Au/mesoporous silica composite particles. Transmission electron microscopy(TEM) and nitrogen desorption characterization revealed that thickness of the mesoporous shell increased from 30 nm to 20 and 8 nm when the pre-treatment time after the addition of choline was delayed from 4 min to 8 and 15 min, respectively. Additionally, when the concentration of cetyltrimethylammonium bromide in the reaction medium increased from 2.0 mmol/L to 8.0 mmol/L, mesoporous pore diameter of the silica shell increased from 2.0 nm to 2.8 nm. Finally, as the volume ratio of water to ethanol decreased from 15∶1 to 13∶3, number of the Au particles encapsulated within the mesoporous silica shells could be further adjusted, transitioning from single-core to multi-core encapsulation, and the catalytic results showed that the multi-core encapsulated Au/mesoporous silica composite particles exhibited higher catalytic activity.

Key words: Mesoporous silica, Au particles, Composite particles, Catalytic performance

CLC Number: 

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