Electroless Gold Island Thin Films: Photoluminescence and Thermal Transformation to Nanoparticle Ensembles

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• 作者：Wonmi Ahn ; Benjamin Taylor ; Anal&iacute ; a G. Dall'Asé ; n ; D. Keith Roper
• 刊名：Langmuir
• 出版年：2008
• 出版时间：April 15, 2008
• 年：2008
• 卷：24
• 期：8
• 页码：4174 - 4184
• 全文大小：869K
• 年卷期：v.24,no.8(April 15, 2008)
• ISSN：1520-5827

文摘

Electroless gold island thin films are formed by galvanic replacement of silver reduced onto a tin-sensitized silicasurface. A novel approach to create nanoparticle ensembles with tunable particle dimensions, densities, and distributionsby thermal transformation of these electroless gold island thin films is presented. Deposition time is adjusted to producemonomodal ensembles of nanoparticles from 9.5 ± 4.0 to 266 ± 22 nm at densities from 2.6 × 10¹¹ to 4.3 × 10⁸particles cm^-2. Scanning electron microscopy and atomic force microscopy reveal electroless gold island film structuresas well as nanoparticle dimensions, densities, and distributions obtained by watershed analysis. Transmission UV-visspectroscopy reveals photoluminescent features that suggest ultrathin EL films may be smoother than sputtered Aufilms. X-ray diffraction shows Au films have predominantly (111) orientation.