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Portable Photoelectrochemical Device Integrated with Self-Powered Electrochromic Tablet for Visual Analysis
Qianhui Yang1, Qing Hao1, Jianping Lei1
1State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering , Nanjing University , Nanjing 210023 , People's Republic of China.
Analytical Chemistry
|February 21, 2018
Summary
A portable device integrates a self-powered electrochromic tablet for visual analysis. This photoelectrochemical (PEC) sensor enables colorimetric detection of analytes like pyrophosphate ions (PPi) with high sensitivity.
Area of Science:
- Electrochemistry
- Materials Science
- Analytical Chemistry
Background:
- Portable analytical devices are crucial for on-site detection.
- Visual readout methods offer simple and accessible analysis.
- Photoelectrochemical (PEC) sensing combines light and electrochemical detection for enhanced sensitivity.
Purpose of the Study:
- To develop a portable, self-powered photoelectrochemical (PEC) device with a visual readout.
- To create an integrated electrochromic (EC) tablet for colorimetric analysis.
- To demonstrate the device's capability for detecting pyrophosphate ions (PPi).
Main Methods:
- Integration of an electron-injector (EI) for photo-to-electric conversion and an electrochromic (EC) part for readout.
- Coating the EI with dye-sensitized titanium dioxide and the EC part with Ni-doped tungsten trioxide (WO3) film.
- Utilizing white LED illumination and proton presence to induce color change in the WO3 film for visual detection.
Main Results:
- The Ni-doped WO3 film achieved over 80% transmittance modulation for enhanced signal.
- A visualized PEC sensing platform was successfully constructed for PPi detection.
- The device demonstrated good reversibility and stability in colorimetric measurements.
Conclusions:
- A smart, portable PEC device with a visual readout was successfully developed.
- The device offers a simple, sensitive, and stable platform for colorimetric analysis.
- This work provides a foundation for practical visual sensing applications.
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