首页|Metal to insulator transition for conducting polymers in plasmonic nanogaps

Metal to insulator transition for conducting polymers in plasmonic nanogaps

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Conjugated polymers are promising material candidates for many future applications in flexible displays,organic circuits,and sensors.Their performance is strongly affected by their structural conformation including both electrical and optical anisotropy.Particularly for thin layers or close to crucial interfaces,there are few methods to track their organization and functional behaviors.Here we present a platform based on plasmonic nanogaps that can assess the chemical structure and orientation of conjugated polymers down to sub-10 nm thickness using light.We focus on a representative conjugated polymer,poly(3,4-ethylenedioxythiophene)(PEDOT),of varying thickness(2-20 nm)while it undergoes redox in situ.This allows dynamic switching of the plasmonic gap spacer through a metal-insulator transition.Both dark-field(DF)and surface-enhanced Raman scattering(SERS)spectra track the optical anisotropy and orientation of polymer chains close to a metallic interface.Moreover,we demonstrate how this influences both optical and redox switching for nanothick PEDOT devices.

Yuling Xiong、Rohit Chikkaraddy、Charlie Readman、Shu Hu、Kunli Xiong、Jialong Peng、Qianqi Lin、Jeremy J.Baumberg

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NanoPhotonics Centre,Cavendish Laboratory,Department of Physics,University of Cambridge,Cambridge CB3 0HE,UK

School of Physics &Astronomy,University of Birmingham,Edgbaston,Birmingham,UK

College of Advanced Interdisciplinary Studies and Hunan Provincial Key Laboratory of Novel Nano-Optoelectronic Information Materials and Devices,National University of Defense Technology,Changsha,China

Hybrid Materials for Opto-Electronics Group,Department of Molecules and Materials,MESA+Institute for Nanotechnology,Molecules Center and Center for Brain-Inspired Nano Systems,Faculty of Science and Technology,University of Twente,Enschede,Netherlands

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European Research Council(ERC)under Horizon 2020 research and innovation programme PICOFORCEUK EPSRCUK EPSRCRoyal SocietyNational Natural Science Foundation of China

883703EP/L027151/1EP/S022953/1RGS\R1\23145862105369

2024

10.1038/s41377-023-01344-7

光:科学与应用(英文版)
中国科学院长春光学精密机械与物理研究所

光:科学与应用(英文版)

CSTPCD
ISSN：2095-5545
年,卷(期)：2024.13(1)
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