化学镀金岛状薄膜：光致发光及向纳米颗粒聚集体的热转变

Electroless gold island thin films: photoluminescence and thermal transformation to nanoparticle ensembles.

作者信息

Ahn Wonmi, Taylor Benjamin, Dall'Asén Analía G, Roper D Keith

机构信息

Department of Materials Science and Engineering, University of Utah, Salt Lake City, UT 84112, USA.

出版信息

Langmuir. 2008 Apr 15;24(8):4174-84. doi: 10.1021/la703064m. Epub 2008 Mar 7.

DOI:10.1021/la703064m

PMID:18324846

Abstract

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

摘要

通过将还原的银在锡敏化的二氧化硅表面进行化学置换反应，形成了化学镀金岛状薄膜。本文提出了一种新颖的方法，通过对这些化学镀金岛状薄膜进行热转化，来制备具有可调粒径、密度和分布的纳米颗粒聚集体。调整沉积时间，以产生粒径在9.5±4.0至266±22纳米之间、密度在2.6×10¹¹至4.3×10⁸个颗粒/平方厘米之间的单峰纳米颗粒聚集体。扫描电子显微镜和原子力显微镜揭示了化学镀金岛状薄膜结构以及通过流域分析获得的纳米颗粒尺寸、密度和分布。透射紫外-可见光谱揭示了光致发光特性，表明超薄电致发光薄膜可能比溅射金薄膜更光滑。X射线衍射表明金薄膜主要具有(111)取向。