Recent Advances in Graphene-Based Humidity Sensors with the Focus of Structural Design: A Review

TL;DR

This review discusses recent structural design strategies of graphene-based humidity sensors, highlighting how these innovations enhance sensor performance and address current challenges for practical applications.

Contribution

It provides a comprehensive overview of various synthesis methods, device structures, and design strategies for graphene-based humidity sensors, emphasizing their impact on performance improvement.

Findings

Structural design significantly improves sensor sensitivity and stability.

Graphene's unique properties enable high-performance humidity sensing.

Challenges include material stability and scalability for practical use.

Abstract

The advent of the 5G era means that the concepts of robot, VR/AR, UAV, smart home, smart healthcare based on IoT (Internet of Things) have gradually entered human life. Since then, intelligent life has become the dominant direction of social development. Humidity sensors, as humidity detection tools, not only convey the comfort of human living environment, but also display great significance in the fields of meteorology, medicine, agriculture and industry. Graphene-based materials exhibit tremendous potential in humidity sensing owing to their ultra-high specific surface area and excellent electron mobility under room temperature for application in humidity sensing. This review begins with the introduction of examples of various synthesis strategies of graphene, followed by the device structure and working mechanism of graphene-based humidity sensor. In addition, several different structural design methods of graphene are summarized, demonstrating the structural design of graphene can not only optimize the performance of graphene, but also bring significant advantages in humidity sensing. Finally, key challenges hindering the further development and practical application of high-performance graphene-based humidity sensors are discussed, followed by presenting the future perspectives.