Synthesis and characterization of semiconducting nanowires for gas sensing

Structural and Electrical Properties of SnO2:F Thin Films Prepared by Chemical Vapor Deposition Method

“…Non-stoichiometric and doped films of oxides of cadmium, tin, zinc, indium, and their various alloys, which are deposited by various techniques, show high transmittance in the visible optical range, high reflectance in the IR region, and very high conductivity. Based on these fantastic properties, some of the TCOs applications include transparent electrodes in solar cells [6], light emitting diodes [7], liquid crystal displays [8], heat mirrors [9], dye-synthesized solar cells [10], wave guide electron devices [11], thick-film sensors [12], organic light emitting diodes [13], flat panel displays [14] and so on. TCOs are generally manufactured as undoped and doped form of indium oxide (In 2 O 3 ), tin oxide (SnO 2 ), zinc oxide (ZnO) and cadmium oxide (CdO) which show high visible transmittance, high electrical conductivity, and high near IR reflectivity which is applicable in energy conserving [15].…”

ZnO nanoparticles or ZnO films: A comparison of the gas sensing capabilities

“…However, they have, to some extent, suffered from limitations in sensitivity, selectivity and stability when compared to more expensive alternatives. Recent advances in nanotechnology and nanomaterials have fostered fabrication techniques that can be harnessed to increase the response and performance of these materials [1,2]. This is because their performance is governed by the exposed surface area; the gas sensing mechanism being due to reactions that occur at the sensor surface.…”

“…Yamazoe and Shimanoe have studied the role of shape and size of nanocrystals for the response to oxygen of semiconducting materials [4]. Growth of nanowires, nanorods and nanobelts has demonstrated that the high surface to volume ratio gave these nanostructures enhanced sensor qualities [2,5]. The most common methods to produce sensing layers require thermal treatment of the film, which, unfortunately, causes grain growth and has a detrimental effect on the surface to volume ratio of the sensing layer [6].…”

“…The most common methods to produce sensing layers require thermal treatment of the film, which, unfortunately, causes grain growth and has a detrimental effect on the surface to volume ratio of the sensing layer [6]. Nanostructures, like nanorods or nanoparticles, that exhibit a high degree of crystallinity suffer less from this drawback and should enable production of sensor devices with good long-term stability [2,7,8]. A multitude of metal oxides can potentially be used for these types of sensors, including tin, indium, titanium and zinc oxides.…”

“…Comparison of the gas sensing properties have been performed for different size and shape of nanstructures, as described earlier in this section [2][3][4][5]. Here we compare the gas sensing behaviour of films and nanoparticles, which we think are of fundamental intereset.…”