Nitrogen doped high quality CVD grown graphene as a fast responding NO₂gas sensor

Abstract

Nitrogen doped high quality CVD grown graphene is demonstrated for application in a high performance NO2 gas sensor.

Boron-doped few-layer graphene nanosheet gas sensor for enhanced ammonia sensing at room temperature

“…Nitrogen as a dopant in graphene for inducing n-type conductivity has already been explored widely in terms of its synthesis, [19][20][21][22] characterization 23,24 and applications. [25][26][27] On the other hand, boron, with less electronegativity than carbon, can induce ptype conductivity in graphene on doping. There are only a few experimental studies [28][29][30][31][32][33] that demonstrate the properties and applications of boron-doped graphene, which further re-ignites researchers worldwide for more experimental exploration in this area.…”

Complementary Dual-Channel Gas Sensor Devices Based on a Role-Allocated ZnO/Graphene Hybrid Heterostructure

“…On the basis of these results, the gas response of the ZnO (30 nm)/graphene-based gas sensor was estimated to be 3.9, 11.6, and 16.9% corresponding to 1, 10, and 20 ppm NO 2 concentration, respectively, and that of the ZnO (100 nm)/graphene sensor was 3.7, 13.4, and 18.5% corresponding to 1, 10, and 20 ppm NO 2 concentration, respectively, as summarized in Figure k. These extracted gas responses for the heterostructures are ∼30 times higher than those of the graphene-based gas sensor, as shown in the Figure S4, which implies that our device has a competitive advantage over rival heteromaterials. − In addition, we examined the gas response of the gas sensors on the basis of ZnO (30 nm)/graphene under the injection of various gas species (NO 2 , NH 3 , CH 4 , and H 2 ) to evaluate the selectivity of gas sensors, as presented in Figure S5. The resulting gas responses of the gas sensor were estimated to be 108.6% (100 ppm NO 2 ), 65.3% (100 ppm NH 3 ), 5.6% (1000 ppm H 2 ), and 3.2% (1000 ppm CH 4 ), which mean that the gas responses of the ZnO/graphene gas sensor for NO 2 and NH 3 were higher than those for H 2 and CH 4 .…”

Adsorption of water on epitaxial graphene

“…Most of the early studies used contact angle measurements in ambient, later on, a few groups used glove boxes and inert atmosphere for contact angle measurements and noticed then that contact angles change with measuring time [51,53]. Actually, at least for HOPG [37,38,47], it is known since the 1990s that carboneous surfaces can easily be contaminated in ambient [67]. A number of species can be generated on surfaces at ambient in various ways that may result in, e.g., hydrophilic adsorption sites [21,68].…”