AI Article Synopsis
- The study explores the gas-sensing capabilities of a van der Waals heterojunction made from graphene and a MoS flake, focusing on its sensitivity to nitrogen monoxide (NO) gas.
- Researchers ensured accurate measurements by passivating non-relevant areas, revealing that the device's resistance changed significantly (over 10 times) when exposed to 1 ppm NO under specific electrical conditions.
- The sensor's response varied depending on the applied reverse bias and back-gate voltages, showing improved sensitivity with increased reverse bias but reduced response at high forward bias or positive back-gate voltage.
Article Abstract
We report on the gas-sensing characteristics of a van der Waals heterojunction consisting of graphene and a MoS flake. To extract the response actually originating from the heterojunction area, the other gas-sensitive parts were passivated by gas barrier layers. The graphene/MoS heterojunction device demonstrated a significant change in resistance, by a factor of greater than 10, upon exposure to 1 ppm NO under a reverse-bias condition, which was revealed to be a direct reflection of the modulation of the Schottky barrier height at the graphene/MoS interface. The magnitude of the response demonstrated strong dependences on the bias and back-gate voltages. The response further increased with increasing reverse bias. Conversely, it dramatically decreased when measured at a large forward bias or a large positive back-gate voltage. These behaviors were analyzed using a metal-semiconductor-metal diode model consisting of graphene/MoS and counter Ti/MoS Schottky diodes.
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| http://dx.doi.org/10.1021/acsami.8b14667 | DOI Listing |
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