Issue 3, 2021

Highly stable Pd/HNb3O8-based flexible humidity sensor for perdurable wireless wearable applications

Abstract

Real-time, daily health monitoring can provide large amounts of patient data, which may greatly improve the likelihood of diagnosing health conditions at an early stage. One potential sensor is a flexible humidity sensor to monitor moisture and humidity information such as dehydration. However, achieving a durable functional nanomaterial-based flexible humidity sensor remains a challenge due to partial desorption of water molecules during the recovery process, especially at high humidities. In this work, we demonstrate a highly stable resistive-type Pd/HNb3O8 humidity sensor, which exhibits a perdurable performance for over 100 h of cycle tests under a 90% relative humidity (RH) without significant performance degradation. One notable advantage of the Pd/HNb3O8 humidity sensor is its ability to regulate hydroniums due to the strong reducibility of H atoms dissociated on the Pd surface. This feature realizes a high stability even at a high humidity (99.9% RH). Using this superior performance, the Pd/HNb3O8 humidity sensor realizes wireless monitoring of the changes in the fingertip humidity of an adult under different physiological states, demonstrating a facile and reliable path for dehydration diagnosis.

Graphical abstract: Highly stable Pd/HNb3O8-based flexible humidity sensor for perdurable wireless wearable applications

Supplementary files

Article information

Article type
Communication
Submitted
12 okt 2020
Accepted
04 jan 2021
First published
07 jan 2021

Nanoscale Horiz., 2021,6, 260-270

Author version available

Highly stable Pd/HNb3O8-based flexible humidity sensor for perdurable wireless wearable applications

Y. Lu, K. Xu, M. Yang, S. Tang, T. Yang, Y. Fujita, S. Honda, T. Arie, S. Akita, Y. Chueh and K. Takei, Nanoscale Horiz., 2021, 6, 260 DOI: 10.1039/D0NH00594K

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