HC Plastics News: Researchers at the Cambridge Graphene Center show that graphene can be used in sensors for sensitive safety testing to detect explosives and other harmful substances. Combining monoatomic thick carbon with thermoelectric materials to generate an electric field when heated or cooled, the team has created a sensor that detects temperature changes to tens of μK. The study, part of the graphene flagship program, deposits graphene layers on thermoelectric substrates to produce devices. Placed on top of the device is called a gate electrode, which concentrates the temperature-induced induced electric field generated by the substrate onto the graphene. This will change the resistance of the material. The research team claims that devices that measure changes in resistance due to heating are called bolometers, and the combination of thermoelectric and thermal bolometers means that these sensors can be used as pixels in high-resolution thermal imaging cameras. A particular advantage of using graphene in this system is its use as a built-in amplifier for the substrate thermoelectric signal. Dr. Alan Colli, a collaborator of the study, said: "They can make amplifiers directly on pyroelectric materials. Therefore, all the costs it develops are placed on the amplifier. There is no loss in this way. Colli adds that the conductivity of graphene also helps integrate the sensor with an external readout IC to ensure that the sensor signal is transmitted as efficiently as possible. The temperature change detected by the sensor is 1000 times smaller than the temperature change induced by a common sensor close to the human hand. This sensitivity means that the sensor can be used in spectroscopy to detect narrow bands that absorb or emit infrared spectra by specific chemical groups. Editor in charge: Wang Ning 12
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