Journal
LIQUID CRYSTALS
Volume 49, Issue 11, Pages 1524-1530Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02678292.2022.2045371
Keywords
Photonic structure; liquid crystal; inverse opal; vapour detection
Funding
- National Natural Science Foundation of China [62005008, 51973017]
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A novel optical sensor based on an inverse opal photonic structure infiltrated by a liquid crystalline material doped with reactive compounds is proposed. The sensor shows a responsive photonic band gap signal upon exposure to butylamine vapor, simplifying the measurement process and potentially useful for detecting other volatiles.
We propose an optical sensor based on the inverse opal (IOP) photonic structure infiltrated by a typical liquid crystalline material doped by the reactive compounds. Benefiting from the unique photonic property of the IOP structure, the composite sensor shows not only a typical textural change but also a responsive photonic band gap (PBG) upon the exposure to butylamine (BA) vapour, due to the reorientation of the liquid crystalline molecules induced by the chemical reaction between the dopant and the BA vapour. This approach simplifies the measurement process by capturing the PBG signal instead of the polarised optical texture, which does not require high cost or complex instruments and might be instructive for detecting other volatiles.
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