spin-coated thin films of sio2–wo3 composites for detection

... 45 (1997) 141–146 Spin-coated thin films of SiO 2 –WO 3 composites for detection of sub-ppm NO 2 Xusheng Wang, Go Sakai, Kengo Shimanoe, Norio Miura, Noboru Yamazoe * Department of Materials Science ... that the growth of WO 3 grains was suppressed by SiO 2 . Fig. 2. Average grain size of WO 3 evaluated from XRD as a function of SiO 2 content. Fig. 3 shows AFM images of...

Ngày tải lên: 20/03/2014, 13:08

... developed a super- vised classifier for identifying speculation cues and a manually compiled list of lexico-syntactic rules for identifying their scopes. For the performance of the rule based system on ... present a linguistically moti- vated rule-based system for the detection of nega- tion and speculation scopes that performs on par with state -of- the-art machine learning sy...

Ngày tải lên: 20/02/2014, 04:20

Ngày tải lên: 14/03/2014, 13:20

... the Research Council of Sharif University of Technology for the financial support of the project. The partial support of the High Technology Organization (HTO) of the Ministry of Industries and Mines ... K.D. Lee, Thin Solid Films 302 (1997) 84. [24] M. Ohring, Materials Science of Thin Films, Academic Press, New York, 2002, p. 510. [25] C.F. Bohren, D.R. Huffman, Absorp...

Ngày tải lên: 20/03/2014, 13:04

... Properties of Thin Films 451 10.1. Introduction to Electrical Properties of Thin Films 451 10.2. Conduction in Metal Films 455 10.3. Electrical Transport in Insulating Films 464 ... for too many years. of you. Thin Films - A Historical Perspective Thin- film technology is simultaneously one of the oldest arts and one of the newest sciences. In...

Ngày tải lên: 05/03/2014, 17:20

... images of CdS thin films prepared in the bath with 3 ml of 1M CdSO 4 solution for 9h (a) and with 25 ml of 1M CdSO 4 solution for 2h (b). 3.3. Raman spectroscopy The typical Raman spectrum of ... Fig. 1. Typical X-ray diffractogram of CdS thin films as grown. Inset shows XRD pattern of the CdS thin films reported in [9]. B.X. Hop et al. / VNU Journal of S...

Ngày tải lên: 14/03/2014, 13:20

... the substrate after annealing in H 2 for 10 min followed by CH 4 :H 2 for 10 min. More process time is necessary for the synthesis of the nanowires without CH 4 . Large density of the nanowires was achieved ... films, resulting in formation of a titanium oxide (TiO x ) phase by removal of oxygen from the silica layer [9]. The re- duction of TiN seems to be a critical factor in...

Ngày tải lên: 16/03/2014, 15:04

... quantity of aluminium is less, the chance of formation of excess unreacted aluminium oxide responsible for higher resistivity is negligible. This argument is substantiated by the low value of resistivity ... maximum height of a ridge/hill is 600 nm. This implies the minimum depth of the val- ley/pit is also 600 nm by considering the surface comprising of the top of the ridge...

Ngày tải lên: 19/03/2014, 16:47

... ( D R). At a wavelength of 600 nm, for neat TiO 2 nanotube structures only a 3% change could be ob- tained whereas for the WO 3 loaded systems 45% for the as-formed, and 21% for the annealed structure ... JetFirst, at 450 °C for 1 h with heating and cooling rate of 30 °C min À1 to form an anatase structure [17]. For WO 3 nanocrystallite deposition, WCl 6 (Aldrich 99.9%) in pow...

Ngày tải lên: 19/03/2014, 16:47