Atomic Force Microscopy Based Top-Illumination Electrochemical Tip-Enhanced Raman Spectroscopy
| Autor: | Zhi-Cong Zeng, Xiang Wang, Teng-Xiang Huang, Mao-Hua Li, Maofeng Cao, Si-Si Wu, Yi-Fan Bao, Bin Ren |
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| Rok vydání: | 2020 |
| Předmět: |
Opacity
business.industry Chemistry 010401 analytical chemistry 010402 general chemistry Laser Electrochemistry Electrocatalyst 01 natural sciences 0104 chemical sciences Analytical Chemistry law.invention Numerical aperture symbols.namesake chemistry.chemical_compound law Polyaniline symbols Optoelectronics business Raman spectroscopy Nanoscopic scale |
| Zdroj: | Analytical chemistry. 92(18) |
| ISSN: | 1520-6882 |
| Popis: | Electrochemical tip-enhanced Raman spectroscopy (EC-TERS) is a powerful technique for the in situ study of the physiochemical properties of the electrochemical solid/liquid interface at the nanoscale and molecular level. To further broaden the potential window of EC-TERS while extending its application to opaque samples, here, we develop a top-illumination atomic force microscopy (AFM) based EC-TERStechnique by using a water-immersion objective of a high numerical aperture to introduce the excitation laser and collect the signal. This technique not only extends the application of EC-TERS but also has a high detection sensitivity and experimental efficiency. We coat a SiO2 protection layer over the AFM-TERS tip to improve both the mechanical and chemical stability of the tip in a liquid TERS experiment. We investigate the influence of liquid on the tip-sample distance to obtain the highest TERS enhancement. We further evaluate the reliability of the as-developed EC-AFM-TERS technique by studying the electrochemical redox reaction of polyaniline. The top-illumination EC-AFM-TERS is promising for broadening the application of EC-TERS to more practical systems, including energy storage and (photo)electrocatalysis. |
| Databáze: | OpenAIRE |
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