期刊
ACS SENSORS
卷 6, 期 3, 页码 915-924出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssensors.0c02109
关键词
holographic sensor; Bragg gratings; hydrogels; spectroscopy; alcohol detection
资金
- Engineering and Physical Sciences Research Council (EPSRC) [EP/T013567/1]
- Khalifa University of Science and Technology (KUST) [8474000211-FSU-2019-04]
- KU-KAIST Joint Research Center [8474000220-KKJRC-2019-Health1]
- Sandooq Al Watan LLC (SWARD) [8434000391-EX2020-044]
- European Union [896410]
- Conacyt [1327713]
- Marie Curie Actions (MSCA) [896410] Funding Source: Marie Curie Actions (MSCA)
- EPSRC [EP/T013567/1] Funding Source: UKRI
A holographic fabrication setup was developed to produce holographic sensors for quantifying alcohol species up to 60 vol %. The sensors demonstrated rapid response and reversibility, with a signal saturation time of 7.5 min. Simulation of fabrication parameters using MATLAB helped model the interference pattern and energy flux profile of laser beam recording in the hydrogel medium.
Holographic sensors are two-dimensional (2D) photonic crystals that diffract narrow-band light in the visible spectrum to quantify analytes in aqueous solutions. Here, a holographic fabrication setup was developed to produce holographic sensors through a doubly polymerization system of a poly-2-hydroxyethyl methacrylate hydrogel film using a pulsed Nd:YAG laser (lambda = 355 nm, 5 ns, 100 mJ). Wavelength shifts of holographic Bragg peak in response to alcohol species (0-100 vol %) were characterized. Diffraction spectra showed that the holographic sensors could be used for short-chain alcohols at concentrations up to 60 vol %. The reversibility of the sensor was demonstrated, exhibiting a response time of 7.5 min for signal saturation. After 30 cycles, the Bragg peak and color remained the same in both 20 and 60 vol %. The fabrication parameters were simulated in MATLAB using a 2D finite-difference time-domain algorithm to model the interference pattern and energy flux profile of laser beam recording in the hydrogel medium. This work demonstrates a particle-free holographic sensor that offers continuous, reversible, and rapid colorimetric readouts for the real-time quantification of alcohols.
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