Department of Physics and Electronics, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan.
Nanoscale Horiz. 2021 Mar 1;6(3):260-270. doi: 10.1039/d0nh00594k. Epub 2021 Jan 20.
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/HNbO 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/HNbO 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/HNbO 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.
实时、日常健康监测可以提供大量患者数据，这可能极大地提高早期诊断健康状况的可能性。一种潜在的传感器是一种灵活的湿度传感器，可以监测水分和湿度信息，如脱水。然而，由于在恢复过程中水分子的部分解吸，特别是在高湿度下，实现基于耐用功能纳米材料的灵活湿度传感器仍然是一个挑战。在这项工作中，我们展示了一种高稳定的电阻式 Pd/HNbO 湿度传感器，它在 90%相对湿度 (RH) 下进行超过 100 小时的循环测试，没有明显的性能下降，表现出持久的性能。Pd/HNbO 湿度传感器的一个显著优点是，由于 Pd 表面上离解的 H 原子具有很强的还原性，它能够调节水合氢离子。即使在高湿度 (99.9% RH) 下，这一特性也能实现高稳定性。利用这种卓越的性能，Pd/HNbO 湿度传感器实现了对成年人不同生理状态下指尖湿度变化的无线监测，为脱水诊断提供了一种简单可靠的方法。
