templated nanoporous metal oxide thin films for molecular recognition

... thin films, as well [26] Among metal oxide semiconductors, tungsten oxide is a promising material for gas sensing Several studies have shown that it can be used for the detection of nitrogen oxide ... special regime of thin film deposition by dc magnetron, ion-beam or rf sputtering from metallic or metal oxide targets Two different special regimes can be used In the first one the formation of “extra” ... by profilomentry and ellipsometry for those tungsten oxide thin films deposited with interruptions during the deposition process The formation into the body of the thin film of several “extra” interfaces...

Ngày tải lên: 20/03/2014, 13:05

... structure for optimizing the device performance Additionally, NiO thin films fabricated by thermal oxidation of evaporated Ni film are also characterized for comparison with the sputtered films 2.1.2 ... with suitably uniform tube walls by oxidation of nickel nanowires was demonstrated for the first time The applications of NiO thin films and nanostructures were then investigated for resistive switching ... Experimental Details .29 Growth of Thin Films and Nanowires 29 3.1.1 Sputtering for thin film growth 29 3.1.2 Chemical bath deposition for porous film growth 30 3.1.3 Anodization,...

Ngày tải lên: 09/09/2015, 10:07

... selected metal oxide sensors to identify the gases under tests by means of pattern recognition and classification techniques Experimental 2.1 Fabrication of thick-film sensor arrays Porous metal oxide ... onboard computational power for miniaturized sensors Mr Marquis has special technical expertise in thin- film deposition and metal oxide film design and engineering for selective detection of chemical ... and PCA transformed features were standardized to a zero mean and unity variance for each dimension The standardization was not necessary for the point features due to the transforms used to...

Ngày tải lên: 20/03/2014, 13:07

... Performance of Zinc Oxide Thin Films 1990 - M.S., Metallurgical Engineering, Yonsei University, Seoul, KOREA Thesis title: Characterization of Defects in Sputtered AlN Protective Thin Film for ... rates of sputtered ZnO thin films The following other semiconducting oxide films, e.g SnO2, WO3, CTO and V2O5 were investigated and compared with ZnO films These oxides films were fabricated onto ... semiconducting oxides including SnO2 is still poor since the focus has been on the empirical optimization of sensor performance Even though semiconducting oxide thin films have been actively investigated for...

Ngày tải lên: 28/05/2014, 14:44

... applicable to large-area device fabrication Much effort has been made for solution process development that can form nanoscale -thin organic films with a large area while minimizing material wastes ... performance made by the electrospray process The summary of device performances is in Table To investigate the difference between electrospray and spin-coating processes, PVK thin films were formed ... the electrospray process to organic thin films in OLEDs was demonstrated in small-scale devices [12] In this work, we demonstrated nanoscale-thick organic thin films using the electrospray process...

Ngày tải lên: 20/06/2014, 23:20

... for SRSO:Er layers It was shown that thinness-related effects decrease the PL for thin films by a factor of These effects are mainly due to three origins: (1) high stress prevailing in thin films ... the evolutions of IPL in function of the Si excess for the 50-nm-thick films The IPL optimum is reached for about 14 at.%, before decreasing for higher Si contents In parallel, we observe a gradual ... high as nm The observed darker regions in (b) are accounted for Er-clusters and are observed also in some regions of thin films the film thinness are to be circumvented and/or considered To estimate...

Ngày tải lên: 21/06/2014, 03:20

... same conditions as for film preparation, but in an oxygen-free atmosphere This procedure ensures an oxide- free metallic surface for each deposition For the deposition of the films, both oxygen ... produced by the aqueous sol-gel method Thin Solid Films 2003, 436:269 Manning TD, Parkin IP, Blackman C, Qureshi U: APCVD of thermochromic vanadium dioxide thin films - solid solutions V2-xMxO2 (M ... achieved for Mo-doped and Nb-doped films, respectively The transition temperature (Tt) obtained for the pure VO2 film prepared by pulsed-DC sputtering was 59°C, which is lower than that obtained for...

Ngày tải lên: 21/06/2014, 04:20

... studied extensively for the metal- supported metal oxide sensors but the observance of such mechanism for the metal- only sensors has not been reported so far In the case of metal metal oxide sensors, ... typical X-ray diffraction patterns (XRD) for the sputtered Pd thin films Film thickness of 150 nm was same for sputtered thin films used for hydrogen sensing Grain size in the films was observed to ... 2008), p 1967 15 F Wu, J.E Morris, Thin Solid Films 246, 17 (1994) 16 Y.-T Cheng, Y Li, D Lisi, W.M Wang, Sens Actuators B: Chem 30, 11 (1996) 17 A Barr, Thin Solid Films 41, 217 (1977) 18 T Xu, M.P...

Ngày tải lên: 22/06/2014, 00:20

... Ouyang Jianyong for extending prompt support in my final year when I was unable to carry out research at SERIS due to unfortunate and unforeseen circumstances Financial support in the form of a Ph.D ... extraction layer 25 2.9 Motivation 27 2.9.1 Metal oxides interfacial layers 27 2.9.2 Solution processing metal oxide interfacial layers 28 2.9.3 Objective of This Work ... relevance for lightweight and flexible applications The results presented in this dissertation are focused on exploring wet chemical or solution processes to fabricate metal oxide films that...

Ngày tải lên: 10/09/2015, 09:24

... associated with thin films are thought to have significant effects [21-23] Studies on ferroelectric thin films are therefore complicated The performance of a specific ferroelectric thin film is ... potential of BTS thin films The efforts toward improving the tunable and pyroelectric properties of BTS thin films have demonstrated the appealing prospective applications of BTS thin films in the relevant ... 2.1 Competing technologies for tunable circuits…………………… ….…26 Table 3.1 Deposition conditions for BTS thin films ……………………………39 Table 3.2 Properties of the BTS thin films with different thicknesses……………52...

Ngày tải lên: 10/09/2015, 15:48

... α-Fe2O3 thin films The synthesis of α-Fe2O3 thin films by a two-step process comprising the electrodeposition of thin iron films and the calcination of the iron films in air at 650℃ to form hematite ... solution 22 Fig 3.1 XRD patterns of (a) as-deposited iron thin films, (b) α-Fe2O3 thin films obtained from the as-deposited iron thin films after two hours of calcination in air at 650 oC (c) ... synthesize α-Fe2O3 thin films This method has the advantages of being simple, low cost, environmental friendly and potentials for further modifications by metal doping The α-Fe2O3 thin films showed...

Ngày tải lên: 26/09/2015, 10:05

... Systemic Study of Indium Zinc Oxide Thin Films 32 Transparent Amorphous Indium Zinc Oxide Thin Films B Kumar Chapter Transparent Amorphous Indium Zinc Oxide Thin Films 3.1 Introduction This chapter ... polycrystalline films were calculated by Scherrer’s formula {Equation (2.8)} A Systemic Study of Indium Zinc Oxide Thin Films 35 Transparent Amorphous Indium Zinc Oxide Thin Films G= B Kumar ... Zinc Oxide Thin Films 38 Transparent Amorphous Indium Zinc Oxide Thin Films B Kumar has been extensively employed in the analysis of the free carrier absorption for transparent conducting oxides.3...

Ngày tải lên: 26/09/2015, 10:44

... for 1h for times to remove the excess lithium ions in the form of LiOH Finally, the suspension was centrifuged at 3000rpm for 0.5h for 3-4 times to remove the thicker materials MoS2 thin films ... optoelectronics 1.2 Atomically thin films of two dimensional transition metal dichalcogenides The weak van der Waals forces between the layers allow isolation of atomically thin sheets of LTMDs via ... of LTMDs in organic solvents Furthermore, atomically thin films of LTMDs can be synthesized by several other methods For instance, MoS2 thin films were successfully synthesized by annealing (NH4...

Ngày tải lên: 30/09/2015, 10:13

... Techniques for oxide film growth The opportunities offered by oxide films in many applications have aroused great interests in exploring the techniques to fabricate them For the synthesis of oxide films ... Transition Metal Oxides, Wiley/VCH, New York, (1998) [3] A.J Moulson, J.M Herbert, Electroceramics, Chapman & Hall, London, (1990) [4] P.A Cox, Transition Metal Oxides, Oxford University Press, Oxford, ... films of most perovskite oxides This leads to a large strain in the perovskite oxide films, which can be used to improve the properties of the oxides and to study the stress effect in these oxides...

Ngày tải lên: 07/10/2015, 10:10

... become the molecular target for the development of many cancer therapeutics Despite intense research on the folate structureactivity relationship, the molecular basis for the high affinity recognition ... methionine synthase (MS) Finally, THF together with formate and ATP are substrates for formate–tetrahydrofolate ligase (MTHFD1) to synthesize 10-formal THF, which is another important functional ... ribonucleotide transformylase (GARFT) and aminoimidazole-4carboxamide ribonucleotide transformylase (AICARFT) subsequently add one LITERATURE REVIEW carbon group from 10-formyl THF to the purine...

Ngày tải lên: 09/09/2015, 11:28

... embedded within the matrix of metal oxide Based on these results, the modulation of the width of two depletion layers existing at the surface of metal oxide grains and at the interface of metal oxide ... enhanced performance of hybrid metal oxide/ MWCNT sensors in comparison with pure metal oxide or pure MWCNT sensors Acknowledgements This work was funded in part by the Spanish Commission for Science ... reported for 1/100 wt.% MWCNT/WO3 sensors and 1/1000 wt.% MWCNT/WO3 sensors were irresponsive to NO2 Therefore, sensor responsiveness heavily depends on the amount of MWCNTs dispersed on the metal oxide...

Ngày tải lên: 19/03/2014, 16:48

... tungsten oxide and molybdenum oxide [4] 1.2.1 Crystal structures of tungsten oxide and molybdenum oxide For Mo oxide, just as for W oxide, the basic structural element is an octahedron with a metal ... which these oxide thin films grow Here we suppose that a thin layer of oxide exists in the metal and is growing; we require to know how fast it grows We consider a film of oxide on the metal exposed ... ions leave a metal and pass through oxide layer (Mott 1947) We may also introduce the energy Φ required to remove an electron from the metal into the conduction band of the oxide; for oxide grown...

Ngày tải lên: 25/03/2015, 11:58

Ngày tải lên: 14/03/2014, 13:20

... Grain-size effects in tungsten oxide- based sensor for nitrogen oxides, J Electrochem Soc 141 (1994) 2207 – 2210 [4] G Sberveglieri, G Faglia, S Groppelli, P Nelli, Methods for the preparation of NO, ... tin oxide thin films, grown by means of the r.f magnetron sputtering technique, Sensors and Actuators B (1992) 79 – 88 [5] N Miura, S Yao, Y Shimizu, N Yamazoe, New auxiliary sensing materials for ... surface acoustic wave chemical sensor for NO2, Sensors and Actuators 19 (1989) 385 – 392 [7] T Inoue, K Ohtsuka, Y Yoshida, Y Matsuura, Y Kajiyama, Metal oxide semiconductor NO2 sensor, Sensors...

Ngày tải lên: 20/03/2014, 13:08

... Barrier Films Sulfide Films Glassy Thick Films Unsupported Glass Films New Oxide- Based Gel Films Organic Modified Silicate Films Scuff Resistant Layers Solid Phase System for ... All-Alkoxide Method Probably materials following the best starting materials for solgel preparations are the class of known as metal alkoxides All metals form alkoxides and they have the general formula: ... Cataloging-in-Publication Data Sol-Gel technology for thin films, fibers, preforms, electronics, and speciality shapes Bibliography: p Includes index Ceramic materials Glass fibers Thin films Colloids I Klein, Lisa...

Ngày tải lên: 30/03/2014, 12:20