Robust and High Spatial Resolution Light Addressable Electrochemistry Using Hematite (α-Fe2O3) Photoanodes
| Autor: | Taek Dong Chung, Jeongse Yun, Sung Yul Lim, Daye Seo, Jihye Lee |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Materials science Light spot Biomolecule Nanotechnology 02 engineering and technology Hematite 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Redox 0104 chemical sciences chemistry visual_art Electrode High spatial resolution visual_art.visual_art_medium Surface modification General Materials Science 0210 nano-technology |
| Zdroj: | ACS Applied Materials & Interfaces. 10:33662-33668 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.8b10812 |
| Popis: | Light addressable/activated electrochemistry (LAE) has recently attracted attention as it can provide spatially resolved electrochemical information without using pre-patterned electrodes whose sizes and positions are unchangeable. Here, we propose hematite (α-Fe2O3) as the photoanode for LAE, which does not require any sort of surface modification for protection or facilitating charge transfer. As experimentally confirmed with various redox species, hematite is stable enough to be used for repetitive electroanalytical measurements. More importantly, it offers exceptionally high spatial resolution so that the “virtual electrode” is exactly as large as the light spot owing to the short diffusion length of the minority carriers. Quantitative analysis of dopamine in this study shows that the hematite-based photoanode is a promising platform for many potential LAE applications including spatially selective detection of oxidizable biomolecules. |
| Databáze: | OpenAIRE |
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