A ZnO nanorod based layered ZnO/64° YX LiNbO3 SAW hydrogen gas sensor

Abstract

Abstract-A zinc oxide (ZnO) nanorod based surface acoustic wave (SAW) sensor has been developed and investigated towards hydrogen (H 2 ) gas. The ZnO nanorods were deposited onto a layered ZnO/64° YX LiNbO 3 substrate using a liquid solution method. Micro-characterization results revealed that the diameters of ZnO nanorods are around 100 and 40 nm on LiNbO 3 and Au (metallization for electrodes), respectively. The sensor was exposed to different concentrations of H 2 in synthetic air at operating temperatures between 200°C and 300°C. The study showed that the sensor responded with highest frequency shift at 265°C. At this temperature, stable base-line and fast response and recovery were observed.

Solvothermally synthesized tungsten oxide nanowires/nanorods for NO2 gas sensor applications

“…In recent years, various nanostructured materials such as nanowires, nanotubes, nanorods and nanobelts, have been evaluated as ideal candidates for gas sensor applications due to their large specific surface areas and dimensions comparable to Debye length [7,8]. In fact, gas sensing materials such as tin oxide [9], titanium oxide [10], zinc oxide [11] and indium oxide [12] with well-established nanostructure have shown higher sensitivity and quicker response in gas detection at low concentrations than their corresponding thin film materials [13,14].…”

Structural, diffused reflectance and photoluminescence study of cerium doped ZnO nanoparticles synthesized through simple sol–gel method

“…It is a promising material for many optoelectronic applications [4][5][6] such as ultraviolet lasers, light-emitting diodes, p-n junction devices, solar cells, chemical sensors. Due to its large binding energy (60meV), wide band gap (3.37eV) [7][8][9][10] and easy synthesis and assembly methods, the utilization of ZnO has covered various fields such as electric transistors [11], photovoltaic devices [12][13][14] and chemical and biological sensors [15][16][17][18]. Nowadays, the nanostructured ZnO materials such as ZnO nanowires [19][20][21][22][23], nanoparticles [24], and nanotetrapods [25] have attracted wide attention since their large surface area and enhanced quantum confinement lead to novel electrical and optical properties for device application.…”

Alignment nature of ZnO nanowires grown on polished and nanoscale etched lithium niobate surface through self-seeding thermal evaporation method

“…Accordingly, they are widely adopted as nanostructured sensing medium in chemical sensors [1][2][3][4][5]. For instance, 1-D ZnO nanostructures such as nanowires and nanorods have been used as sensing medium in acoustic wave devices like surface acoustic wave (SAW) devices [6][7][8][9][10][11] and quartz crystal microbalance (QCM) [12,13] for gas sensing and UV detection purposes. These kinds of acoustic devices are generally made of piezoelectric substrates such as quartz, lithium niobate, lithium tantalate, gallium orthophosphate and langasite.…”