Thin Film Materials-L. B. Freund,S. Suresh

... case, the vibrational frequencies of m -WO3 are quite higher than these of o -WO3 And the reason is that parameters of crystalline structure of m -WO3 are smaller than that of o -WO3 or the force constant ... cm-1 of covalent bonds W – O, there is only one clear modification, comparing to Raman spectra of film on thinner ITO layers The only difference is a...

Ngày tải lên: 13/02/2014, 03:20

... www.vishay.com/doc?91000 MBA/SMA 0204, MBB/SMA 0207, MBE/SMA 0414 - Precision Precision Thin Film Leaded Resistors Vishay Beyschlag Power Dissipation P FUNCTIONAL PERFORMANCE MBE/SMA 0414 MBB/SMA 0207 MBA/SMA ... www.vishay.com/doc?91000 MBA/SMA 0204, MBB/SMA 0207, MBE/SMA 0414 - Precision Precision Thin Film Leaded Resistors Current...

Ngày tải lên: 20/02/2014, 10:20

... reduction of electron concentration in the N2 Otreated films Conclusions The postfabrication N2 O plasma treatment on the asfabricated MOCVD ZnO TFTs changed their device operation from depletion-mode ... number of ionized oxygen vacancies in the ZnO film.57–59,61–63) In general, an ionized oxygen vacancy in a ZnO film donates two electrons to the conduction band, which is mainly res...

Ngày tải lên: 05/03/2014, 21:20

... 270–274 272 Table Relative resistance of the thin film fired in different atmosphere Žmeasured at 2008C Number Firing atmosphere Kind of thin film Kind of measuring gas Relative resistance 1a 1H 2a ... al., Gas sensing properties of platinum dispersed- TiO2 thin film derived from precursor, Sens Actuators, B 62 Ž2000 55–60 w13x M Egashira, Y Shimizu, Y Tak...

Ngày tải lên: 19/03/2014, 16:48

... composite sensors still operate at elevated temperatures To the best of our knowledge, it seems that experimental data on SnO2 /CNTs composite-based gas sensors operated at room temperature are ... powder and thin film formations 3.2 Gas sensor characteristics 3.2.1 Sensor response at room temperature and sensing mechanism Fig plots a typical response curve to NH3 gas...

Ngày tải lên: 19/03/2014, 16:48

... Response time (T1 ) and recovery time (T2 ) of sensors based on PANI/ TiO2 thin films prepared at 0, 10 and 20 ◦ C when exposed to NH3 of various concentrations at room temperature Concentration ... absorbance wavelengths of PANI/ TiO2 thin films prepared at different polymerization temperature Polymerization temperature (◦ C) Fig FTIR spectra of pure PANI an...

Ngày tải lên: 20/03/2014, 13:04

... spread out between adjacent grains is increased by oxidizing vapours and decreased in the opposite case [6–8], that implies a variation of resistivity in the same way Since 1980, many authors have ... polycrystalline layer made up of grains which have a great disparity of shape and size In this work, the grains are supposed to be quasi-spherical, identical in size, and...

Ngày tải lên: 20/03/2014, 13:04

... could be formed during the process of interruption The prolongation of film growth on the “extra” interface involves a new nucleation of the metal oxide film, the formation and growth of a film ... of the sensors heavily depend on the conditions and methods used in their preparation [27–31] Since grain size is one of the key factors to enhance the gas sensing properties of...

Ngày tải lên: 20/03/2014, 13:05

... Selected-area electron diffraction patterns recorded on mesoporous WO3 that is characteristic of diffuse electron diffraction rings demonstrate that the walls of our material are made up of nanocrystallite ... lead to excellent sensing properties upon exposure to low concentration of NO2 in air at low temperatures and enabled the selective detection of NO2 and H2 gases...

Ngày tải lên: 20/03/2014, 13:07

... Manuscript Thin Film Polypyrrole/ SWCNTs Nanocomposites-Based NH3 Sensor ip t Operated at Room Temperature Nguyen Van Hieu a,*, Nguyen ... The thin film and the porous film could be the reasons explaining why the PPY /SWCNTs composite-based sensor exhibits a higher response compared to that of PPY-based sensors Additionally, SWCNTs ... the PPY /SWCNTs composite senso...

Ngày tải lên: 20/03/2014, 13:11

... electrodes In the present study a planar structure thin film gas sensor was fabricated with TiO2 as the sensing layer A thin sensitive TiO2 film was deposited by a DC reactive magnetron sputtering ... planar structure thin film gas sensor was fabricated with TiO2 as the sensing layer A thin sensitive TiO2 684 B Karunagaran et al / Materials Characterization 58 (2...

Ngày tải lên: 20/03/2014, 13:11

... Morphology of WO3 thin films Thin films of WO3 could be derived from the WO3 ·2H2 O sol added with PEG (2 wt.%) by one time spin coating and calcination at 300 ◦ C for h Fig shows SEM images of the thin ... films of WO3 for NO2 sensing, Sens Actuators B 95 (2003) 258 Conclusions Biographies An aqueous sol of WO3 ·2H2 O, added with PEG, could be applied successfull...

Ngày tải lên: 20/03/2014, 13:11

... sensitive to TMA at 50–85◦ C, but not sensitive to NH3 , gasoline, C2 H5 OH, CH4 and CO and water vapor These results indicate that the WO3 thin film sensor prepared by a sol–gel Fig X-ray photoelectron ... lie at 37.1 and 35.20 eV, respectively and are contributed to lattice tungsten in the WO3 crystal 3.2 Gas sensing properties of the thin film sensors Result...

Ngày tải lên: 20/03/2014, 13:12

... calculated quantities, Thin Solid Films 313314 (1998) 33 [6] R Swanepoel, Ellipsometry data for some thin film samples, J Phys E: Sci Instrum., 16 (1983) 1215 [7] Jobin-Yvon, Horiba Group Ellipsometry ... conditions (e.g the angle of polarization mirrors and modulators) and parameters of film (∆, Ψ) The measurement configuration is chosen for the purpose of simplifying the c...

Ngày tải lên: 28/03/2014, 13:20

... Number: 28766 Revision: 03-Dec-12 ±1% 920 - - 825 - ± 0.5 % MBE 0414 920 - - 825 - ±1% 921 - - 826 - ± 0.5 % 921 - - 826 - For technical questions, contact: filmresistorsleaded@vishay.com www.vishay.com ... www.vishay.com/doc?91000 MBA/SMA 0204, MBB/SMA 0207, MBE/SMA 0414 - Professional Pulse Load Pmax Professional Thin Film L...

Ngày tải lên: 31/03/2014, 00:20