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SERS‐ and Electrochemically Active 3D Plasmonic Liquid Marbles for Molecular‐Level Spectroelectrochemical Investigation of Microliter Reactions
Author(s) -
Koh Charlynn Sher Lin,
Lee Hiang Kwee,
PhanQuang Gia Chuong,
Han Xuemei,
Lee Mian Rong,
Yang Zhe,
Ling Xing Yi
Publication year - 2017
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201704433
Subject(s) - bifunctional , plasmon , electrochemistry , microreactor , raman scattering , materials science , raman spectroscopy , nanotechnology , electrode , redox , chemistry , optoelectronics , organic chemistry , optics , catalysis , physics , metallurgy
Liquid marbles are emergent microreactors owing to their isolated environment and the flexibility of materials used. Plasmonic liquid marbles (PLMs) are demonstrated as the smallest spectroelectrochemical microliter‐scale reactor for concurrent spectro‐ and electrochemical analyses. The three‐dimensional Ag shell of PLMs are exploited as a bifunctional surface‐enhanced Raman scattering (SERS) platform and working electrode for redox process modulation. The combination of SERS and electrochemistry (EC) capabilities enables in situ molecular read‐out of transient electrochemical species, and elucidate the potential‐dependent and multi‐step reaction dynamics. The 3D configuration of our PLM‐based EC‐SERS system exhibits 2‐fold and 10‐fold superior electrochemical and SERS performance than conventional 2D platforms. The rich molecular‐level electrochemical insights and excellent EC‐SERS capabilities offered by our 3D spectroelectrochemical system are pertinent in charge transfer processes.