Plasmon-induced electrical conduction in molecular devices.

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.

Department

Description

Provenance

Subjects

Citation

Published Version (Please cite this version)

10.1021/nn901148m

Publication Info

Banerjee, Parag, David Conklin, Sanjini Nanayakkara, Tae-Hong Park, Michael J Therien and Dawn A Bonnell (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.

This is constructed from limited available data and may be imprecise. To cite this article, please review & use the official citation provided by the journal.

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 into the structure-property relationships of molecular, nanoscale, and macroscopic materials allow us to fabricate polarizable and hyperpolarizable chromophores, structures for molecular electronics applications, optical limiters, and a wide range of other electrooptic and photonic materials that include novel conducting polymers, structures for solar energy conversion, and new platforms for in vivo optical imaging. Other efforts in our laboratory involve the elaborating de novo electron- and energy-transfer proteins, interrogating catalytic redox reactions, designing catalysts for small molecule activation, and developing new tools to manipulate nanoscale structures.


Unless otherwise indicated, scholarly articles published by Duke faculty members are made available here with a CC-BY-NC (Creative Commons Attribution Non-Commercial) license, as enabled by the Duke Open Access Policy. If you wish to use the materials in ways not already permitted under CC-BY-NC, please consult the copyright owner. Other materials are made available here through the author’s grant of a non-exclusive license to make their work openly accessible.