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SERS- and Electrochemically Active 3D Plasmonic Liquid Marbles for Molecular-Level Spectroelectrochemical Investigation of Microliter Reactions |
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| Authors: | Charlynn Sher Lin Koh Hiang Kwee Lee Gia Chuong Phan-Quang Dr Xuemei Han Mian Rong Lee Zhe Yang Prof Xing Yi Ling |
| Institution: | 1. Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371 Singapore;2. Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371 Singapore
Institute of Materials Research and Engineering, Agency for Science, Technology and Research, A*STAR, 2 Fusionopolis Way, Innovis, No. 08-03, Singapore, 138634 Singapore |
| Abstract: | 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. |
| Keywords: | 3D electrodes Ag nanoparticles in situ SERS liquid marbles spectroelectrochemistry |