Wearable photonic crystal double network hydrogel sensor based on structural color analysis

Zhenye Liu, Wenxin Zhang, Yu Qiao, Lili Qiu, Zihui Meng*

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

Abstract

This paper introduces a high-toughness photonic crystal (PhCs) dual-network hydrogel sensor designed for mechanical sensing, which enables quantitative analysis of structural color using the HSB color space. The hydrogel achieves a maximum tensile strain of 250% under a tensile stress of 3.5 MPa, thanks to its dual-network structure comprising a covalently cross-linked polyacrylamide (PAM) network and an ionically cross-linked sodium alginate (SA) network. At an 80% tensile strain, the PAM-SA photonic crystal hydrogel displays a blue shift in the bandgap wavelength of over 130 nm and demonstrates a sensitivity of 1.69 nm/%. The analysis of the force-induced color change in the PAM-SA photonic crystal hydrogel utilized both RGB and HSB color spaces. In the HSB color space, the hue component (H) exhibited a strong linear correlation with strain (R2>0.95), indicating the feasibility of quantitative structural color analysis using HSB. As a wearable sensor, the PAM-SA photonic crystal hydrogel precisely detects human motion via bandgap displacement (R2=0.989) and structural color change (R2=0.978). The PAM-SA PhCs hydrogel, featuring easily accessible color information and high sensitivity, has broad potential applications in wearable devices and mechanical sensors.

Original languageEnglish
Article number012104
JournalJournal of Physics: Conference Series
Volume2842
Issue number1
DOIs
Publication statusPublished - 2024
Event2024 11th International Conference on Advanced Manufacturing Technology and Materials Engineering, AMTME 2024 - Guangzhou, China
Duration: 22 May 202423 May 2024

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