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ZnO nanostructures were grown from a solution of zinc nitrate hexahydrate and hexamethylenetetramine onto different substrates that were pretreated with an RF sputter coated ZnO seed layer. The choice of substrate was observed to have a direct effect on the morphology, orientation and surface coverage of the nanostructured arrays. Substrates that were covered in a 1.2 mum sputter coated ZnO seed layer,...
In this paper, we present a surface acoustic wave (SAW) gas sensor based on nano-structured molybdenum oxide (MoOx) thin film. The film was deposited onto a 36deg YX LiTaO3 SAW transducer, with an operating frequency of approximately 103 MHz, by thermal evaporation. The nanostructured MoOx film consists of connected nanorods with diameters of less than 100 nm. We compared devices with MoOx deposited...
Single crystal nanobelts of ZnO were synthesized and deposited onto 36deg YX LiTaO3 and 64deg YX LiNbO3 surface acoustic wave (SAW) devices for gas sensing applications. Sensor response, defined as the change in resonant frequency, was measured for H2 and NO2 between 20 and 200degC. Measured sensor responses were 3.5 kHz towards 10 ppm NO2 for a 64deg LiNbO3 SAW transducer operating at 160degC and...
Palladium (Pd) nanowires were synthesized by electro chemical deposition technique. Pd nanowires were transferred onto a ZnO/36deg LiTaO3 surface acoustic wave (SAW) transducer with an approximate operating frequency of 100 MHz. This operational frequency approximately corresponds to the device's highest conductometric sensitivity. These devices were investigated for hydrogen (H2) sensing at the room...
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