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Doubly Photopolymerized Holographic Sensors
Nan Jiang1,2, Sam Davies2, Yimeng Jiao2
1West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu 610041, China.
ACS Sensors
|February 9, 2021
Summary
Researchers developed a novel holographic sensor for real-time alcohol detection. This particle-free hydrogel sensor offers continuous, reversible, and rapid colorimetric readouts for quantifying alcohol concentrations.
Area of Science:
- Photonics
- Materials Science
- Chemical Sensing
Background:
- Holographic sensors are 2D photonic crystals used for analyte quantification.
- Existing methods may lack real-time, continuous, or reversible detection capabilities.
Purpose of the Study:
- To develop a novel holographic sensor fabrication method.
- To demonstrate the sensor's efficacy in real-time alcohol quantification.
Main Methods:
- Fabrication of holographic sensors using a poly-2-hydroxyethyl methacrylate hydrogel and a pulsed Nd:YAG laser.
- Characterization of wavelength shifts in response to varying alcohol concentrations (0-100 vol %).
- Simulation of fabrication parameters using a 2D finite-difference time-domain algorithm in MATLAB.
Main Results:
- The holographic sensors accurately quantified short-chain alcohols up to 60 vol %.
- The sensor demonstrated reversibility with a response time of 7.5 min for signal saturation.
- Sensor performance remained stable after 30 cycles at different concentrations.
Conclusions:
- A particle-free holographic sensor was successfully fabricated.
- The sensor provides continuous, reversible, and rapid colorimetric detection of alcohols.
- This technology enables real-time quantification of alcohol concentrations.
