Cu Nanocrystalline And Rare Earth (La ^{3 +} Ce ^{3 +} ) Doped SnO 2 Nanobelts

This paper divides into two parts, the first one is Cu nano-film by double ionbeam sputter deposition shows excellent properties of high density, surface smoothand better nature. And it is the preparation of electrode in the second one of this paper;The second part is the La3+and Ce3+ions of rare earth doping and comparativeanalysis of the two nanobelts which before and after doping.Cu nano-films with different thickness were deposited on the (100) siliconsubstrate by dual-ion beam sputtering method. The research of the sample werecharacterized by atomic microscope and measured by elliptic partial instrument,respectively. It is found that the angel between the peak position of atomic flux andthe normal of target material is about15.1°under the case of45°oblique incidence.The roughness formula of Cu nano-films were given on the symmetrical distributionof normal sides on the basis of the five power of cosine distribution on the thicknessand the normal quantitative relation of thin film surface roughness which both sidessymmetrical distribution is provided in this paper. Experimental and theoretical showthat the thickness uniformity, compactness, and surface roughness of thin film bydouble ion beam sputter deposition system are superior to other methods. Double ionbeam sputter deposition system can be used for the preparation of high quality opticalthin film and electrodes.The tin dioxide nanobelts and La3+and Ce3+doped tin dioxide nanobelts used bythermal evaporation method are researched such as structural characterization andmicrostructure analysis by scanning electron microscopy, electron energy spectrum, Xray diffraction, HRTEM method and means. Based on this, making gas sensor ofsingle nanobelt by mask plate and testing the gas-sensing properties of the nanoscaledevices before and after doping. Results show that La3+-doped SnO2nanobelt has theoptimal gas sensitivity at230℃, and the enhance to ethanediol is about3times,ethanol is about1.77times, acetone is about1.5times comparing with pure single tindioxide nanobelt. Response time and recovery time is lower than the time of thin film devices significantly. The high sensitivity and high selectivity to ethanediol ofLa3+-doped SnO2nanobelt shows it suitable for the detection to ethanediol. This hasthe very good guidance function on the production and application of gas sensor thatdetect ethanediol. The nature of the Ce3+doping show similar to the situation of La3+doped, but the reaction was smaller than La3+doping. And the best workingtemperature of Ce3+doping nanobelt and La3+doping nanobelt is190℃a nd230℃,respectively. Comparing with this two elements doping shows that La3+doping hasmore application value in the detection of ethanediol...