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Controllable Preparation of Thiol-Modified Silica Particles by an Optimized Stöber Method
Shuhan Hui1,2, Yandong Han1, Wensheng Yang1,2
1Engineering Research Center for Nanomaterials, Henan University, Kaifeng 475000, China.
Langmuir : the ACS Journal of Surfaces and Colloids
|July 4, 2025
Summary
This study optimized silica particle modification using 3-mercaptopropyltrimethoxysilane (MPTMS) for enhanced thiol group presence. The resulting thiol-modified silica/gold (SH-SiO2/Au) composites show high catalytic activity in reducing p-nitroaniline.
Area of Science:
- Materials Science
- Nanotechnology
- Surface Chemistry
Background:
- Silica particles are versatile substrates for surface modification.
- Thiol functionalization is crucial for creating advanced nanomaterials.
- Controlling particle morphology and surface chemistry is key for applications.
Purpose of the Study:
- To investigate the hydrolysis/condensation of 3-mercaptopropyltrimethoxysilane (MPTMS) for thiol modification on silica particles.
- To optimize the Stöber method for controlled synthesis of thiol-modified silica particles (SH-SiO2).
- To evaluate the catalytic performance of SH-SiO2/Au composite particles.
Main Methods:
- Optimized Stöber method controlling pH, water content, and MPTMS concentration.
- Ellman's colorimetric method and Raman spectroscopy for quantifying thiol modification.
- Synthesis of SH-SiO2/Au composite particles via Au3+ adsorption and reduction.
Main Results:
- Systematic control over silica particle size, shape, and distribution was achieved.
- Quantitative analysis confirmed successful thiol group modification on silica surfaces.
- The synthesized SH-SiO2/Au composite particles demonstrated significant catalytic activity.
Conclusions:
- The hydrolysis/condensation of MPTMS can be effectively controlled to modify silica surfaces with thiol groups.
- Optimized synthesis yields thiol-modified silica particles suitable as precursors for composite materials.
- SH-SiO2/Au composite particles exhibit promising catalytic properties for reduction reactions.
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