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首页> 外文期刊>Advanced functional materials >Lattice Proton Intercalation to Regulate WO_3-Based Solid-Contact Wearable pH Sensor for Sweat Analysis
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Lattice Proton Intercalation to Regulate WO_3-Based Solid-Contact Wearable pH Sensor for Sweat Analysis

机译：Lattice Proton Intercalation to Regulate WO_3-Based Solid-Contact Wearable pH Sensor for Sweat Analysis

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摘要

Sweat pH monitoring is a routine indicator in wearable biotechnology. The state-of-the-art wearable pH sensors mostly rely on organic materials but face the risk of biological toxicity. WO3 is a typical H+-sensitive inorganic material with chemical stability, biocompatibility, and low cost but low sensitivity and slow response. Lattice H+ intercalation is herein proposed as an efficient approach that can greatly improve the sensitivity and selectivity of WO3-based pH sensors. Specifically, lattice H+ intercalation can promote WO3 from the monoclinic phase to cubic phase, which enhances the ion exchange capacity between WO3 and H+. The resistance decreases more than two orders of magnitudes, which improves the interfacial charge transport. The occupancy of lattice H+ leads to ion exchange only with H+, thus increasing the H+ recognition. The intercalated HxWO3 exhibits much improved sensitivity, reversibility, and response time. Additionally, the HxWO3 is integrated with a solid reference electrode on a miniaturized chip for wearable sweat pH monitoring. The pH sensor exhibits good potential response even at curving over 270 degrees. On-body sweat pH measurments show high accuracy compared with ex situ analyses. This work emphasizes the concept of lattice proton intercalation to regulate the H+ recognition of solid contacts.

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