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Hydrogen gas sensor

Hydrogen gas is attracting attention as an eco-friendly next-generation energy source, but it is a dangerous combustible material that can cause an explosion even with small flames. A sensor capable of detecting such hydrogen gas is referred to as a hydrogen gas sensor. It can be applied to various hydrogen fields such as the prevention of accidents caused by hydrogen gas leakage and the hydrogen fuel cell market.

Device architecture of the tandem gasochromic-Pd-WO3/graphene/Si optoelectronic hydrogen sensor.
Sensing mechanism of the Pt@rGO nanocomposite sensor toward hydrogen
Gas sensing mechanism of Au/rGO/ZnO sensor in (a) air (b) air with UV light, and (c) H2 environment with UV irradiation.

Advantages and Comparisons of Graphene Hydrogen Gas Sensors

A graphene-based hydrogen gas sensor capable of precise measurement at room temperature.

It is useful for hydrogen gas detection with explosive properties and has excellent electronic mobility of high-performance sensors at ppm or ppm levels, enabling precise gas measurement even with a small amount of gas concentration.

Item	CNT & Other Sensors	GrapheneLab Sensors
Operating Temperature	CNT & Other Sensors 300°C~500°C	GrapheneLab Sensor RT (Room Temperature)
Power Consumption / Heater · Presence	CNT & Other Sensors Very Big (heater : O)	GrapheneLab Sensor Very Small (heater : X)
Responsiveness	CNT & Other Sensors Very Small (Small current & responsiveness and difficult to measure due to a small number of free electrons)	GrapheneLab Sensor Very Big (easy to measure)
Recovery	CNT & Other Sensors Very Slow (several Min.~dozens of Min.)	GrapheneLab Sensor Very Fast (within several Sec.)
Reaction Speed	CNT & Other Sensors Very Slow (several Sec.~Several of Min.)	GrapheneLab Sensor Several Sec.
Measurement Unit	CNT & Other Sensors ppm (a millionth)	GrapheneLab Sensor ppb (a billionth)
Environment Temperature	CNT & Other Sensors -20°C~80°C	GrapheneLab Sensor -20°C~80°C