Sol-gel synthesis and characterization of Ag and Au nanoparticles in SiO2, TiO2, and ZrO2 thin films
Sol-gel synthesis and characterization of Ag and Au nanoparticles in SiO2, TiO2, and ZrO2 thin films
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DOI：
10.1111/j.1151-2916.2000.tb01566.x
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发表时间：
2000-10-01
影响因子：
3.9
通讯作者：
Vasanelli, L
中科院分区：
文献类型：
--
作者：
Epifani, M;Giannini, C;Vasanelli, L
通过溶胶-凝胶法在 SiO2、TiO2 和 ZrO2 薄膜中合成银和金纳米颗粒。提出了一种基于配位化学的通用方法，用于稳定溶胶-凝胶系统中的 Ag+ 和 Au3+ 离子。测试了金属离子的各种配体，并且对于每个系统都可以找到能够稳定金属离子并防止金沉淀到薄膜表面上的合适配体。通过旋涂到玻璃或熔融石英基底上来制备薄膜，然后在空气或 H-2 气氛中在不同温度下进行热处理以使金属纳米颗粒成核。将SiO2膜加热到600℃，将TiO2和ZrO2膜加热到500℃后，Ag颗粒尺寸约为10nm。在500℃热处理后，TiO2和ZrO2膜中的Au颗粒尺寸分别为13和17nm。采用紫外-可见光吸收光谱和X射线衍射对薄膜进行了表征，研究了金属纳米颗粒的成核和生长，并对嵌入基体、温度和热处理气氛的结果进行了讨论，得出TiO2和ZrO2薄膜的结晶可能阻碍Ag和Au颗粒的生长。
Silver and gold nanoparticles were synthesized by the sol-gel process in SiO2, TiO2, and ZrO2 thin films. A versatile method, based on the use of coordination chemistry, is presented for stabilizing Ag+ and Au3+ ions in sol-gel systems. Various ligands of the metal ions were tested, and for each system it was possible to find a suitable ligand capable of stabilizing the metal ions and preventing gold precipitation onto the film surface. Thin films were prepared by spin-coating onto glass or fused silica substrates and then heat-treated at various temperatures in air or H-2 atmosphere for nucleating the metal nanoparticles. The Ag particle size was about 10 nm after heating the SiO2 film at 600 degrees C and the TiO2 and ZrO2 films at 500 degrees C. After heat treatment at 500 degrees C, the Au particle size was 13 and 17 nm in the TiO2 and ZrO2 films, respectively. The films were characterized by UV-vis optical absorption spectroscopy and X-ray diffraction, for studying the nucleation and the growth of the metal nanoparticles, The results are discussed with regard to the embedding matrix, the temperature, and the atmosphere of the heat treatment, and it is concluded that crystallization of TiO2 and ZrO2 films may hinder the growth of Ag and Au particles.