journal article·2018-11-27

Molecular Orbital Gating Surface-Enhanced Raman Scattering

Chenyang Guo, Xing Chen, Song-Yuan Ding, Dirk Mayer, Qingling Wang, Zhikai Zhao, Lifa Ni, Haitao Liu, Takhee Lee, Bingqian Xu, Dong Xiang

ACS Nano· Volume 12· Issue 11
Publisher page

Abstract

One of the promising approaches to meet the urgent demand for further device miniaturization is to create functional devices using single molecules. Although various single-molecule electronic devices have been demonstrated recently, single-molecule optical devices which use external stimulations to control the optical response of a single molecule have rarely been reported. Here, we propose and demonstrate a field-effect Raman scattering (FERS) device with a single molecule, an optical counterpart to field-effect transistors (a key component of modern electronics). With our devices, the gap size between electrodes can be precisely adjusted at subangstrom accuracy to form single molecular junctions as well as to reach the maximum performance of Raman scattering via plasmonic enhancement. Based on this maximum performance, we demonstrated that the intensity of Raman scattering can be further enhanced by an additional ∼40% if the orbitals of the molecules bridged two electrodes were shifted by a gating voltage. This finding not only provides a method to increase the sensitivity of Raman scattering beyond the limit of plasmonic enhancement, but also makes it feasible to realize addressable functional FERS devices with a gate electrode array.
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Research context

OpenAlex topics: Molecular Junctions and Nanostructures · Gold and Silver Nanoparticles Synthesis and Applications · Advanced biosensing and bioanalysis techniques

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology, Key Laboratory of Optical Information Science and Technology, Institute of Modern Optics, College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300071, China

Department of Chemistry, The Pennsylvania State University, State College, Pennsylvania 16802, United States

State Key Laboratory of Physical Chemistry of Solid Surfaces (PCOSS), Collaborative Innovation Centre of Chemistry for Energy Materials (iChEM), and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China

Peter-Grünberg-Institute PGI-8, Bioelectronic Research Center Jülich GmbH and JARA Fundamentals of Future Information Technology, Jülich 52425, Germany

Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea

College of Engineering, University of Georgia, Athens, Georgia 30602, United States

Funding

National Research Foundation of Korea · National Natural Science Foundation of China

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