Microstructural effects in WO3 gas-sensing films

Structural, optical and morphological studies on laser ablated nanostructured WO3 thin films

“…The presence of sufficient oxygen pressure in the chamber enhances the formation of crystalline tungsten trioxide. In fact, this is the advantage of PLD technique where crystalline films can be grown at substrate temperatures as low as 300 K compared to other physical vapor deposition methods where the reported deposition temperatures should be in the range of 573-723 K for crystallization to occur [9,15,19,24]. of polycrystalline WO 3 in either monoclinic or triclinic crystalline phase [26].…”

“…Gas sensing properties of WO 3 make it suitable for various applications such as environmental monitoring, automotive exhaust monitoring and currently in medical diagnostics for the detection of toxic gases exhausted by patients suffering from various heart and lung diseases [11][12][13][14]. Electrochromic devices based on WO 3 are made of amorphous oxides, while crystalline phase plays a major role in catalysts and sensors [1,15]. Tungsten oxide thin films with nanostructured grains and porosity exhibit high surface area and it accounts for their use as catalysts and sensors [16].…”

Synthesis and characterization of tungsten trioxide powders prepared from tungstic acids

“…Tungsten trioxide (WO 3 ) has been the subject of great interest due to its special electrochromic [1,2], gas sensing [3,4] and catalytic properties [5]. In these applications, the morphological characteristics of the materials like grain size or shape are very important and depend strongly on the preparation method.…”

Fe₂O₃ Thin Films Prepared by Spray Pyrolysis Technique and Study the Annealing on its Optical Properties

“…The electrochromic devices are made of amorphous oxides [18], while crystalline phase plays a major role in catalysts and sensors [19]; this is because the minor change in their chemical composition and crystalline structure could modify different properties of the metal oxides. The Present work is to study the effect of annealing temperature (before annealing, 450 ºC, and 500 ºC) on optical properties of NiO:Fe 2 O 3 thin films that prepared by chemical spray pyrolysis method.…”