Recent Progress on Environmentally Friendly Humidity Sensor: A Mini Review

Abstract

Due to the impact of the epidemic, human health is seriously threatened so that the technology of human health detection is increasingly important, and humidity sensors for detecting human health have been studied extensively. A number of humidity sensors made of a variety of different materials and based on multiple principles have been prepared, which can be classified into numerous categories. This article starts out by introducing sensor materials according to environmentally friendliness. Following that, a variety of structures for humidity sensors, the mechanisms for sensing, and different power supply types are discussed. This study summarizes the review of current research in this field as well as challenges that exist, indicating the focus of possible future research and application prospects. This work may pave the way to understanding the overview of humidity sensing.

Environment-friendly Hanji cellulose paper-based humidity sensor for multifunctional applications

“…To address these challenges, researchers are exploring sustainable alternatives with favorable properties (Murad and Ka 2022;Choi et al 2022;Akram et al 2022;Xu et al 2021). Among the potential solutions, bio-based exible substrates like cellulose paper could mitigate these problems not only due to their low cost, ease of mass production, exibility, biodegradability, recyclability, and deformability, along with good thermal stability (Jansson et al 2022), but also because of its rich hydrophilic and porous surface, which is highly advantageous for humidity sensing applications (Huang et al 2023). Unlike most polymers, which may take hundreds of years to degrade, cellulose paper can be decomposed by naturally occurring microorganisms (fungi, bacteria, yeasts) within weeks.…”

Ternary Holey Carbon Nanohorn/Potassium Chloride/Polyvinylpyrrolidone Nanohybrid as Sensing Film for Resistive Humidity Sensor

“…The control of humidity is essential in many industries, including electronics manufacturing (e.g., semiconductor production facilities), chemical processing (e.g., dehumidifiers, dryers), metallurgy, textiles, and papermaking. It is also important in agriculture (e.g., soil moisture detection), climatology, the automotive industry (e.g., engine test beds), and many others [1][2][3][4][5].…”