期刊
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
卷 64, 期 8, 页码 1179-1184出版社
KOREAN PHYSICAL SOC
DOI: 10.3938/jkps.64.1179
关键词
Diatoms; Self-assembly; Plasmonics; SERS
资金
- National Research Foundation of Korea (NRF) - Korean government (MSIP) [2011-0013704]
- Hanyang University [HY-2010-N]
- National Research Foundation of Korea [2011-0013704] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Marine diatoms have an exquisitely complex exoskeleton that is promising for engineered surfaces such as sensors and catalysts. For such applications, creating uniform arrays of diatom frustules across centimeter scales will be necessary. Here, we present a simple, low-cost floating interface technique to self-assemble the diatom frustules. We show that well-prepared diatoms form floating hexagonal close-packed arrays at the air-water interface that can be transferred directly to a substrate. We functionalize the assembled diatom surfaces with gold and characterize the plasmonic functionality by using surface enhanced Raman scattering (SERS). Thin gold films conform to the complex, hierarchical diatom structure and produce a SERS enhancement factor of 2 x 10(4). Small gold nanoparticles attached to the diatom's surface produce a higher enhancement of 7 x 10(4) due to stronger localization of the surface plasmons. Taken together, the large-scale assembly and plasmonic functionalization represent a promising platform to control the energy and the material flows at a complex surface for applications such as sensors and plasmonic enhanced catalysts.
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