Self-Assembly of Gold Nanoparticles at the Oil鈥揤apor Interface: From Mono- to Multilayers
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- 作者：Philip Born ; Volker Sch枚n ; Susanne Blum ; Dominik Gerstner ; Patrick Huber ; Tobias Kraus
- 刊名：Langmuir
- 出版年：2014
- 出版时间：November 11, 2014
- 年：2014
- 卷：30
- 期：44
- 页码：13176-13181
- 全文大小：401K
- ISSN：1520-5827
文摘
Alkylthiol-coated gold nanoparticles spontaneously segregate from dispersion in toluene to the toluene鈥搗apor interface. We show that surface tension drops during segregation with a rate that depends on particle concentration. Mono- and multilayers of particles form depending on particle concentration, time, and temperature. X-ray reflectometry indicates fast monolayer formation and slow multilayer formation. A model that combines diffusion-limited segregation driven by surface energy and heterogeneous agglomeration driven by dispersive van der Waals particle interactions is proposed to describe film formation.