WO3:Mo and WO3:Ti thin films deposited by spray pyrolysis: The influence of metallic concentration on physical properties: An electron microscopy and atomic force study

被引：4

作者：

Acosta D. ^{[1
]}

Hernández F. ^{[1
]}

López-Suárez A. ^{[1
]}

Magaña C. ^{[1
]}

机构：

[1] Instituto de Física de la Universidad Nacional Autónoma de México, A.P. 20-364 Ciudad Universitaria, Ciudad de México

来源：

Solid State Phenomena | 2019年 / 286卷

关键词：

Mo and Ti doping; Spray pyrolysis; Thin films; Tungsten trioxide;

D O I：

10.4028/www.scientific.net/SSP.286.49

中图分类号：

学科分类号：

摘要：

WO3:Mo and WO3:Ti thin films have been deposited on glass substrates coated with FTO(Fluorine Tin Oxide) kept at Ts= 450°C by the pulsed spray pyrolysis technique. The influence of Molybdenum (Mo) and Titanium (Ti) doping on the structural, electrical, and optical behavior of WO3thin films, has been studied by X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), High Resolution Electron Microscopy (HRTEM), Atomic Force Microscopy (AFM),Ultraviolet and visible (UV-Vis) spectroscopy and Surface Conductivity Methods (Four Points). Doped WO3films present similar polycrystalline structures but noticeable modifications in surface configurations at micrometric and nanometric levels, they were detected when the Mo and Ti concentration in the corresponding starting solution is increased. Variation in grain shapes, size and distribution are observed in SEM and AFM micrographs with increasing Mo and Ti doping respectively. From structural studies, a low density of crystallographic defects was detected in all the samples. It was found that variations in films surface characteristics are mainly related to each type of metallic doping and to their corresponding concentrations. Higher electrical resistivity was found in samples Mo and Ti doped with 8 and 10 at.% respectively. The greater shift in band gap values (3.50 to 3.72 eV) was detected in doped samples with Mo and Ti with 10 % atomic concentration. © 2019 Trans Tech Publications, Switzerland.

引用

页码：49 / 63

页数：14

共 33 条

[1]

Rao C.N.R., Raveau B., Transition Metal Oxides, (1995)

[2]

Deb S.K., Optical and Photoelectric Properties and Colour Centres in Thin Films of Tungsten Oxide Philosophical Magazine, 27, pp. 801-822, (1973)

[3]

Gavrilyuk A.I., Vg Prokhvatilov F.A., Chudnovskiì Photochromism in WO3 thin films. AI Gavrilyuk, Electrochimica Acta, 44, pp. 3027-3037, (1999)

[4]

Jin P., Nakao S., Tanemura S., Tungsten Oxide Thin Films were Grown on Preheated Substrate Thin Solid Films, 324, pp. 151-153, (2015)

[5]

Biswas P.K., Pramanik N.C., Mahapatra M.K., Ganguli D., Livage J., Optical and Electrochromic Properties of Sol-Gel WO3 Films on Conducting Glass Materials Letters, 57, pp. 4429-4432, (2003)

[6]

Agrawal A., Cronin J.P., Zhang R., Review of Solid State Electrochromic Coatings Produced Using Sol-Gel Techniques, 21.Solar Energy Materials and Solar Cells, 31, pp. 9-21, (1993)

[7]

Cantalini C., Wlodarski W., Li Y., Passacantando M., Santucci S., Comini E., Faglia G., Sberveglieri G., Investigation on the O3 Sensitivity Properties of WO3 Thin Films Prepared by Sol-Gel, Thermal Evaporation and Rf Sputtering Techniques, Sensors and Actuators B: Chemical, 64, 1, pp. 182-188, (2000)

[8]

Galatsis K., Li Y.X., Wlodarski W., Kalantar-Zadeh K., Sol-gel prepared MOO,-WO3 Thin Films for Gas Sensing, Sensors and Actuators B: Chemical, 77, pp. 478-483, (2001)

[9]

Lee D.S., Nam K.H., Lee D.D., Thin Solid Films, Effect of substrate on NO2-sensing properties of WO3 thin film gas sensors, Thin Solid Films, 375, 1-2, pp. 142-146, (2000)

[10]

Aly S.A., Et al., Microstructural and electrical characteristics of sprayed Tungsten oxide thin film, Int. J. New. Hor. Phys, 2, 1, pp. 5-10, (2015)

← 1 2 3 4 →