01984nas a2200229   4500008004100000245010700041210006900148260000800217300002800225490000800253520119900261100001901460700001801479700002101497700002001518700001801538700002001556700001801576700001901594700002001613856012101633       2017                        eng d00aSynthesis of gamma-WO3 thin films by hot wire-CVD and investigation of its humidity sensing properties0 aSynthesis of gammaWO3 thin films by hot wireCVD and investigatio  cMAY  aArticle Number: 16007170 v2143 aIn this study, monoclinic tungsten oxide (gamma-WO3) have been grown in a single step using HW-CVD method by resistively heating W filaments in a constant O-2 pressure. The formation of gamma-WO3 was confirmed using low angle-XRD and Raman spectroscopy analysis. Low angle-XRD analysis revealed that as-deposited WO3 film are highly crystalline and the crystallites have preferred orientation along the (002) direction. HRTEM analysis and SAED pattern also show the highly crystalline nature of WO3 with d spacing of similar to 0.38 nm, having an orientation along the (002) direction. Surface topography investigated by SEM analysis shows the formation of a uniform and homogeneous cauliflower like morphology throughout the substrate surface without flaws and cracks. A humidity sensing device incorporating WO3 is also fabricated, which shows a maximum humidity sensitivity factor of similar to 3954% along with a response time of similar to 14 s and a recovery time of similar to 25 s. The obtained results demonstrate that it is possible to synthesize WO3 in a single step by HW-CVD method and to fabricate a humidity sensor by using it. (C) 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim1 aJadkar, Vijaya1 aPawbake, Amit1 aWaykar, Ravindra1 aJadhavar, Ashok1 aDate, Abhijit1 aLate, Dattatray1 aPathan, Habib1 aGosavi, Suresh1 aJadkar, Sandesh  uhttp://library.ncl.res.in/content/synthesis-gamma-wo3-thin-films-hot-wire-cvd-and-investigation-its-humidity-sensing01990nas a2200229   4500008004100000245014100041210007000182260000800252490000600260520113500266100001901401700002201420700002501442700002701467700001901494700001801513700002401531700002201555700002301577700002401600856013601624       2017                        eng d00aSynthesis of orthorhombic-molybdenum trioxide (α-MoO3) thin films by hot wire-CVD and investigations of its humidity sensing properties0 aSynthesis of orthorhombicmolybdenum trioxide αMoO3 thin films by  cJUL0 v13 aIn present work, we report synthesis of orthorhombic-molybdenum trioxide (α-MoO 3) thin films using home-build hot wire-CVD (HW-CVD) method simply by heating the Mo filament in a controlled O 2 atmosphere. The formation of α-MoO 3 was confirmed by low angle-XRD and Raman spectroscopy. Low angle-XRD analysis revealed that α-MoO 3 crystallites have orientations along (110), (101) and (111) directions while Raman spectroscopy analysis shows two prominent vibrational modes ~819 and ~994 cm −1 associated with Mo 2–O and Mo=O respectively. SEM and TEM analysis show the formation of nano-sheets like morphology of α-MoO 3 thin films. The SAED pattern shows highly crystalline nature of α-MoO 3. The humidity-sensing properties were investigated at room temperature by fabricating the two probe device. The humidity sensing results showed n-type behavior of α-MoO 3. The maximum humidity sensitivity of ~6957% along with response time of ~66 s and recovery time of ~5 s were observed for α-MoO 3 thin film humidity sensor device. Our results have opened up a new avenue to grow α-MoO 3 for humidity sensor applications.1 aJadkar, Vijaya1 aPawbake, Amit, S.1 aWaykar, Ravindra, G.1 aJadhavar, Ashok, Arjun1 aMayabadi, Azam1 aDate, Abhijit1 aLate, Dattatray, J.1 aPathan, Habib, M.1 aGosavi, Suresh, W.1 aJadkar, Sandesh, R.  uhttp://library.ncl.res.in/content/synthesis-orthorhombic-molybdenum-trioxide-%CE%B1-moo3-thin-films-hot-wire-cvd-and-investigations