Porous Silica Gels Doped with Gold Nanoparticles: Preparation, Microstructure, Optical and Textural Properties.

IF 5.3 3区化学 Q1 POLYMER SCIENCE

Gels Pub Date : 2025-06-13 DOI:10.3390/gels11060454

Nina Danchova, Dimitar Shandurkov, Roumen Tsekov, Luben Mihaylov, Tony Spassov, Stoyan Gutzov

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Abstract

Porous silica gel powders, doped with gold nanoparticles (AuNPs), were obtained by heating silica gels containing 1-dodecanethiol and tetrachloroauric acid at temperatures of 450 °C, 700 °C and 900 °C, and characterized using X-ray diffraction, TEM/EDS studies, UV/Vis reflectance spectroscopy and DTA/TG investigations. The color and microstructure of the obtained samples with a composition SiO₂:AuNPs (about 0.03% Au) depend on the heating temperature. The UV/Vis reflection spectra of the samples are explained using Mie's theory. The thermal stability of the obtained samples, as well as the processes occurring in the sol-gel matrix upon heating, were monitored by DTA/TG. The textural properties of the obtained materials were described based on adsorption-desorption isotherms. The obtained nanocomposites are promising pigments for ceramic glazes, similar to the Purple of Cassius. The textural properties of certain samples, S_BET = 200-350 m²/g, a mean pore diameter (D_AV) of approximately 10 nm and a specific pore volume (V_t) between 0.5 and 0.8 cm³/g, make them promising candidates for catalytic applications, comparable to aerogel-like materials.

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掺杂金纳米颗粒的多孔硅胶：制备、微观结构、光学和纹理性质。

将含1-十二硫醇和四氯金酸的硅胶在450℃、700℃和900℃的温度下加热，得到了掺杂金纳米颗粒的多孔硅胶粉末，并利用x射线衍射、TEM/EDS、UV/Vis反射光谱和DTA/TG研究对其进行了表征。所得样品的组成为SiO2:AuNPs（约0.03% Au），其颜色和微观结构与加热温度有关。用米氏理论解释了样品的紫外/可见反射光谱。用差热分析/热重分析了样品的热稳定性以及溶胶-凝胶基体在加热时发生的过程。根据吸附-脱附等温线描述了所得材料的结构性质。所制得的纳米复合材料是很有前途的陶瓷釉颜料，类似于卡修斯紫。某些样品的结构特性，SBET = 200-350 m2/g，平均孔径（DAV）约为10 nm，比孔体积（Vt）在0.5至0.8 cm3/g之间，使其成为催化应用的有希望的候选人，可与气凝胶样材料相媲美。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Gels POLYMER SCIENCE-

CiteScore

4.70

自引率

19.60%

发文量

707

审稿时长

11 weeks

期刊介绍： The journal Gels (ISSN 2310-2861) is an international, open access journal on physical (supramolecular) and chemical gel-based materials. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the maximum length of the papers, and full experimental details must be provided so that the results can be reproduced. Short communications, full research papers and review papers are accepted formats for the preparation of the manuscripts. Gels aims to serve as a reference journal with a focus on gel materials for researchers working in both academia and industry. Therefore, papers demonstrating practical applications of these materials are particularly welcome. Occasionally, invited contributions (i.e., original research and review articles) on emerging issues and high-tech applications of gels are published as special issues.