Metal to insulator transition for conducting polymers in plasmonic nanogapsOACSTPCD
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;
NanoPhotonics Centre,Cavendish Laboratory,Department of Physics,University of Cambridge,Cambridge,CB30HE,UKNanoPhotonics Centre,Cavendish Laboratory,Department of Physics,University of Cambridge,Cambridge,CB30HE,UK School of Physics&Astronomy,University of Birmingham,Edgbaston,Birmingham,UKNanoPhotonics Centre,Cavendish Laboratory,Department of Physics,University of Cambridge,Cambridge,CB30HE,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,ChinaNanoPhotonics Centre,Cavendish Laboratory,Department of Physics,University of Cambridge,Cambridge,CB30HE,UK 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
化学
transitioninsulatorconjugated
《Light(Science & Applications)》 2024 (001)
P.23-32 / 10
supported by the European Research Council(ERC)under Horizon 2020 research and innovation programme PICOFORCE(grant agreement no.883703);UK EPSRC EP/L027151/1 and EP/S022953/1.R.C.acknowledges funding from the Royal Society(RGS\R1\231458);J.P.acknowledges support from the National Natural Science Foundation of China(62105369);Y.X.acknowledges support from the Cambridge Trust and CSC scholarship.
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