Effect of Ga-modified layer on flexible hydrogen sensor using ZnO nanorods decorated by Pd catalysts

Silicon nanomembrane phototransistor flipped with multifunctional sensors toward smart digital dust

“…4B), and the detection of a much lower H 2 concentration is also possible because of the distinction between 0.05 volume % H 2 and 0.00 volume % H 2 . This detectivity is comparable to the reported high-performance electric H 2 sensors and much better than recent visual H 2 sensors (29). In addition, considering that the standby current is in the magnitude of tens of picoampere and the working current is below 30 nA, the power consumption of this detecting module could be below the magnitude of microwatt.…”

Synthesis of a ZnO nanorod/CVD graphene composite for simultaneous sensing of dihydroxybenzene isomers

“…The HRTEM image (Fig. 3(e)) illustrated that the lattice fringes of the composite exhibited interplanar spacing of 0.34 and 0.28 nm, which were indexed to the graphite lattice distance of graphene and the crystal face {100} of hexagonal ZnO crystals [37,42,43], respectively. The high-magnification SEM image (Fig.…”

Advances in designs and mechanisms of semiconducting metal oxide nanostructures for high-precision gas sensors operated at room temperature

“…properties, and thermal and chemical stability, many plastic substrates have been used as flexible substrates for the RT gas sensors including polyethylene terephthalate (PET), 223,[402][403][404] polypropylene (PP), 405,406 polyimide (PI), 264,407,408 polyvinyl acetate (PVA) 105 and nylon. 409 For many of these flexible RT gas sensors, a sensitive layer such as ZnO nanorods is often used to deposit onto the device, for example, ZnO nanorods/nylon, 409 Ga-ZnO nanorods/PI, 264 Pd-ZnO nanorods/PI/PET. 173 The aqueous solution method to prepare these ZnO nanorod layers on the polymer substrate is facile with advantages of low growth temperature and easy modifications.…”

“…The vertically well-aligned ZnO nanorods with the Pd catalyst on Ga-modified ZnO seed layer on flexible PI substrates also showed good H 2 sensing properties and good mechanical flexibility at RT with good repeatability, stability and a low LOD of 0.2 ppm, even after being bent at a curvature angle of 901. 264 In addition to being directly grown onto the plastic substrates, the ZnO nanowires were also transferred onto plastic substrates of PET to fabricate a flexible gas sensor using various methods, including slide transfer, roll transfer and heat transfer. 402 A 2D sheet-like ZnO layer was deposited onto the flexible polypropylene papers using a suspension flame spraying method, and the prepared ZnO flexible sensor exhibited good responses and stability to sub-ppm level of NO 2 at RT under white LED light illumination.…”