Growing continuous zinc oxide layers with reproducible nanostructures on the seeded alumina substrates using spray pyrolysis

Silicon Nanowires for Gas Sensing: A Review

“…Metal oxide nanowire (MONW) gas sensors have been recently reported as a low cost and highly sensitive material with a fast response/recovery time and simple electronic interface [30][31][32][33]. MONW gas sensors are able to detect low levels of hazardous gases like NO x , CO x , NH 3 , CH 4 , H 2 S, and SO 2 [9,34,35].…”

Pressure Sensitivity of Charge Conduction Through the Interface Between a Metal Oxide Nanocrystallite and Graphene

“…The feasibility of forming such structures has been demonstrated in our laboratory. [57,62] The pressure sensitive part of the device is the defect-infested metal oxide/Gr interface formed at O-rich conditions. The interface is structurally modified by the external pressure exerted on the nano-crystallite, which, in turn, alters the electron transport through the interface (see below).…”

“…It follows that the device would show the same level of sensitivity at submicron dimensions. Considering the reported growth of isolated submicron faceted ZnO nanocrystallites on various substrate, [59,62,66,67] the fabrication of submicron ZnO/ Gr pressure sensors appear practical. The reproducibility of the response levels are examined by repeated pressure loading and unloading at a fixed biasing voltage.…”

Nanometer-Thick ZnO/SnO2 Heterostructures Grown on Alumina for H2S Sensing

“…Because low operational temperatures are expected, SnO 2 and ZnO recently attracted widespread attention for use as low-power gas-sensing materials. 26 − 28 Among metal oxides, heterostructures such as SnO 2 /CuO, CuO/ZnO, WO 3 /NiO, ZnO/NiO, ZnO/SnO 2 , and so on. have been synthesized with different methods as an active material for H 2 S gas sensing.…”

“… 36 In order to fabricate such devices, it is required that the metal oxides with a designed texture are deposited on dielectric substrates which are chemically stable at high temperatures. 26 Alumina substrates are widely used for depositing polycrystalline functional metal oxides due to their long list of positive features, including high-temperature stabilities and excellent dielectric properties. 26 Different techniques like molecular beam epitaxy, vapor deposition, pulsed laser ablation, sputtering, ultrasonic spray pyrolysis (USP), electrophoretic deposition, and various sol–gel methods have been utilized for depositing ZnO and SnO 2 on alumina substrates.…”