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Surface‐Enhanced Raman Spectra Promoted by a Finger Press in an All‐Solid‐State Flexible Energy Conversion and Storage Film
Author(s) -
Li Haitao,
Dai Han,
Zhang Yihe,
Tong Wangshu,
Gao Hua,
An Qi
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201610737
Subject(s) - raman spectroscopy , substrate (aquarium) , materials science , surface enhanced raman spectroscopy , electrolyte , optoelectronics , dielectric , nanotechnology , nanowire , electrode , chemical engineering , analytical chemistry (journal) , raman scattering , chemistry , optics , organic chemistry , oceanography , physics , geology , engineering
Electrochemically up‐regulated surface‐enhanced Raman spectroscopy (E‐SERS) effectively increases Raman signal intensities. However, the instrumental requirements and the conventional measurement conditions in an electrolyte cell have hampered its application in fast and on‐site detection. To circumvent the inconveniences of E‐SERS, we propose a self‐energizing substrate that provides electrical potential by converting film deformation from a finger press into stored electrical energy. The substrate combines an energy conversion film and a SERS‐active Ag nanowire layer. A composite film prepared from a piezoelectric polymer matrix and surface‐engineered rGO that simultaneously presents high permittivity and low dielectric loss is the key component herein. Using our substrate, increased E‐SERS signals up to 10 times from a variety of molecules were obtained in the open air. Various tests on real‐life sample surfaces demonstrated the potentials of the substrate in fast on‐site detection.