Self-Activated Transparent All-Graphene Gas Sensor with Endurance to Humidity and Mechanical Bending

Abstract

Graphene is considered as one of leading candidates for gas sensor applications in the Internet of Things owing to its unique properties such as high sensitivity to gas adsorption, transparency, and flexibility. We present self-activated operation of all graphene gas sensors with high transparency and flexibility. The all-graphene gas sensors which consist of graphene for both sensor electrodes and active sensing area exhibit highly sensitive, selective, and reversible responses to NO2 without external heating. The sensors show reliable operation under high humidity conditions and bending strain. In addition to these remarkable device performances, the significantly facile fabrication process enlarges the potential of the all-graphene gas sensors for use in the Internet of Things and wearable electronics.

A 3D Chemically Modified Graphene Hydrogel for Fast, Highly Sensitive, and Selective Gas Sensor

“…Furthermore, ammonia (NH 3 ) is a toxic and colorless gas with permissible exposure limit of 50 ppm over 8 h per working day or 40 h per working week 8. Thus, gas sensors that are capable of detecting low‐concentration hazardous gases, inorganic or organic vapors, are highly demanded in the fields of safety, comfort, health, environment protection, and energy 9, 10. Traditional chemiresistor gas sensors based on semiconducting oxides have attracted intensive attention in practical application due to their low cost and small size 9.…”

“…Thus, gas sensors that are capable of detecting low‐concentration hazardous gases, inorganic or organic vapors, are highly demanded in the fields of safety, comfort, health, environment protection, and energy 9, 10. Traditional chemiresistor gas sensors based on semiconducting oxides have attracted intensive attention in practical application due to their low cost and small size 9. However, the requirement of external heaters to maintain high operation temperature (200–600 °C) not only imposes high energy consumption, but also brings thermal safety problems 5, 9.…”

“…Traditional chemiresistor gas sensors based on semiconducting oxides have attracted intensive attention in practical application due to their low cost and small size 9. However, the requirement of external heaters to maintain high operation temperature (200–600 °C) not only imposes high energy consumption, but also brings thermal safety problems 5, 9. Among various gas sensing materials, graphene (Gr) has become a promising candidate recently due to its atom‐thick 2D structure, high surface area, excellent electronic conductivity, low electrical noise, and high sensitivity to electrical perturbations from gas molecules 11.…”

“…The adsorption of trace amounts of gas molecules on Gr surface causes significant charge transfer between Gr and gas molecules, resulting in a noticeable conductance change of Gr 5, 11. Since the pioneering work reported the capability of Gr to detect a single NO 2 molecule,12 Gr materials fabricated via various strategies, such as mechanical exfoliation,12, 13, 14 chemical vapor deposition,1, 9, 15, 16 epitaxial growth,17 and chemically18, 19, 20, 21 or thermally22 reduced graphene oxide (RGO) have been exploited for gas sensing. Among them, RGO has attracted widespread attention for this purpose due to the low cost and high yield in production, and the convenience of modifying it with functional groups or doping atoms to tailor its gas sensing properties 19, 23.…”

Morphology‐Controlled Aluminum‐Doped Zinc Oxide Nanofibers for Highly Sensitive NO2 Sensors with Full Recovery at Room Temperature

“…Recently, several types of gas sensors that operate at RT have been developed based on transitional metal dichalcogenides (TMDs), graphene, and carbon nanotubes (CNTs) 5, 6, 7, 8, 9, 10, 11, 12, 13. Cho et al studied the RT sensing properties of an atomic layer of MoS 2 to NO 2 , owing to the availability of many active edge sites and extraordinary high carrier mobility 14, 15.…”