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Plasmon-induced electrical conduction in molecular devices.

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Date
2010-02-23
Authors
Banerjee, Parag
Conklin, David
Nanayakkara, Sanjini
Park, Tae-Hong
Therien, Michael J
Bonnell, Dawn A
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Abstract
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 NPs 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 NPs can be tuned independently of the optical characteristics of the molecule-a result that has significant implications for future nanoscale optoelectronic devices.
Type
Journal article
Permalink
https://hdl.handle.net/10161/4102
Published Version (Please cite this version)
10.1021/nn901148m
Publication Info
Banerjee, Parag; Conklin, David; Nanayakkara, Sanjini; Park, Tae-Hong; Therien, Michael J; & Bonnell, Dawn A (2010). Plasmon-induced electrical conduction in molecular devices. ACS Nano, 4(2). pp. 1019-1025. 10.1021/nn901148m. Retrieved from https://hdl.handle.net/10161/4102.
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Scholars@Duke

Therien

Michael J. Therien

William R. Kenan, Jr. Distinguished Professor of Chemistry
Our research involves the synthesis of compounds, supramolecular assemblies, nano-scale objects, and electronic materials with unusual ground-and excited-state characteristics, and interrogating these structures using state-of-the-art transient optical, spectroscopic, photophysical, and electrochemical methods. Over chemical dimensions that span molecules to materials, we probe experimental and theoretical aspects of charge migration reactions and ultrafast electron transfer processes. Insights
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