期刊
ACS NANO
卷 4, 期 2, 页码 1019-1025出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn901148m
关键词
gold nanoparticles; porphyrin; surface plasmons; photoconduction
类别
资金
- Nano/Bio Interface Center
- National Science Foundation NSEC [DMR-0425780]
- John and Maureen Hendricks Energy Fellowship
- Department of Energy
Metal nanoparticles (NPs) respond to electromagnetic waves by creating surface plasmons (SPs), which are localized, collective oscillations of conduction electrons on the NP surface. When interparticle distances are small, SPs generated in neighboring NIPS can couple to one another, creating intense fields. The coupled particles can then act as optical antennae capturing and refocusing light between them. Furthermore, a molecule linking such NPs can be affected by these interactions as well. Here, we show that by using an appropriate, highly conjugated multiporphyrin chromophoric wire to couple gold NP arrays, plasmons can be used to control electrical properties. In particular, we demonstrate that the magnitude of the observed photoconductivity of covalently interconnected plasmon-coupled NIPS can be tuned independently of the optical characteristics of the molecule-a result that has significant implications for future nanoscale optoelectronic devices.
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