Inorganic metallodielectric materials fabricated using two single-step methods based on the Tollen's process

被引:38
作者
Peterson, Molly S. M.
Bouwman, Jason
Chen, Aiqing
Deutsch, Miriam
机构
[1] Univ Oregon, Dept Phys, Eugene, OR 97403 USA
[2] Univ Oregon, Dept Chem, Eugene, OR 97403 USA
基金
美国国家科学基金会;
关键词
silver; nanoshell; plasmon; fractal; colloidal crystal;
D O I
10.1016/j.jcis.2006.10.013
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Two methods for preparing polycrystalline silver shells on colloidal silica spheres are reported. These do not include the use of organic ligands or metal seeding steps and are based on the Tollen's process for silvering glass. Reaction parameters such as temperature and reactant concentrations are adjusted to slow the reaction kinetics, which we find leads to preferential silver growth on the spheres. The resulting shells are polycrystalline and granular, showing highly uniform sphere coverage. Surface morphologies range from sparsely interconnected grains for shells similar to 20 nm thick, to complete (yet porous) shells of interconnected silver clusters which are up to similar to 140 nm in thickness. The extinction spectra of the core-shell materials are markedly different from those of smooth continuous shells, showing clear evidence that the granular shell geometry influences the plasmon resonance of the composite system. Spheres coated with shells 20-40 nm thick are also suitable for colloidal crystallization. Monolayers of self-assembled spheres with long-range ordering are demonstrated. (c) 2006 Elsevier Inc. All rights reserved.
引用
收藏
页码:41 / 49
页数:9
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