Thin films of tin and copper oxide forming heterojunction are being studied for applications in photovoltaic systems. The procedure for obtaining such a film was based on the technique of spray pyrolysis with working ...Thin films of tin and copper oxide forming heterojunction are being studied for applications in photovoltaic systems. The procedure for obtaining such a film was based on the technique of spray pyrolysis with working temperature of 600 ℃. The XRD （X-ray diffraction） showed the formation of tin oxides （SnO2） and copper （Cu2O） and its structural parameters are a, b and c, 4.7534 A^°, 4.7534 A^°, 3.1998 A^° （tetragonal form） and 4.2580 A^°, 4.2580 A^°, 4.2580 A^° （cubic form）, respectively. Highseore Plus program was used for phase identification and DBWSTool2.4 program used for refinement. The grain size was estimated by Williamson-Hall.展开更多
The effects of pyrolysis mode and pyrolysis parameters on Cl content in alumina were investigated, and the alumina products were characterized by XRD, SEM and ASAP. The experimental results indicate that the spray pyr...The effects of pyrolysis mode and pyrolysis parameters on Cl content in alumina were investigated, and the alumina products were characterized by XRD, SEM and ASAP. The experimental results indicate that the spray pyrolysis efficiency is higher than that of static pyrolysis process, and the reaction and evaporation process lead to a multi-plot state of the alumina products by spray pyrolysis. Aluminum phase starts to transform into γ-Al2O3 at spray pyrolysis temperature of 600 °C, which is about 200 °C lower than that of static pyrolysis process. The primary particle size of γ-Al2O3 product is 27.62 nm, and Cl content in alumina products is 0.38% at 800 °C for 20 min.展开更多
Zinc Oxide （ZnO） nanostructure were synthesized by precipitating Zinc Chloride and analyzed structurally and optically. Samples were prepared at different thickness （62, 66, 74, 86, 92, and 110 nm）, and substrate ...Zinc Oxide （ZnO） nanostructure were synthesized by precipitating Zinc Chloride and analyzed structurally and optically. Samples were prepared at different thickness （62, 66, 74, 86, 92, and 110 nm）, and substrate temperature kept at 400 ℃ in all cases. Compressed Nitrogen was used as a cartier gas. The samples of the ZnO films were characterized by X-ray diffraction （XRD）, and atomic force microscopy （AFM）. The XRD results indicated that the synthesized ZnO thin films have a pure wurtzite （hexagonal phase） structure. It can be seen that the highest texture coefficient was in （002） plan for nanostructure films. AFM measurement showed the grain size ranging from 62-86 nm. The optical band gap energy （Ee,） of ZnO nanostructure have two values for the same sample and the Eg decrease with increasing thickness utilizing the optical data using UV-Vis spectrophotometer.展开更多
This paper analyzes the effects of nanoporous surface on heat transfer temperaments of assorted thermal conductingmaterials. A phenomenal proposal of wielding the surface roughness to ameliorate the heat transfer rate...This paper analyzes the effects of nanoporous surface on heat transfer temperaments of assorted thermal conductingmaterials. A phenomenal proposal of wielding the surface roughness to ameliorate the heat transfer ratehas been discovered. The maximum increase of heat transfer rate procured by nanoporous layers is 133.3% higherthan the polished bare metals of surface roughness 0.2μm. This plays an imperative role in designing compact refrigerationsystems, chemical and thermal power plants. Experimental results picture a formidable upswing of58.3% heat transfer in chemically etched metals of surface roughness 3 μm, 133.3% in nanoporous surface of porosity75-95 nm formed by electrochemical anodization, and porosity of 40-50 nm formed by spray pyrolysis increasesthe heat transfer by 130%. Effects of porosity, flow velocity and scaling on the energy transfer are alsoscrutinized. This paper also analyzes the multifarious modes of nanoporous fabrication, to contrive both prodigiousand provident system.展开更多
文摘Thin films of tin and copper oxide forming heterojunction are being studied for applications in photovoltaic systems. The procedure for obtaining such a film was based on the technique of spray pyrolysis with working temperature of 600 ℃. The XRD （X-ray diffraction） showed the formation of tin oxides （SnO2） and copper （Cu2O） and its structural parameters are a, b and c, 4.7534 A^°, 4.7534 A^°, 3.1998 A^° （tetragonal form） and 4.2580 A^°, 4.2580 A^°, 4.2580 A^° （cubic form）, respectively. Highseore Plus program was used for phase identification and DBWSTool2.4 program used for refinement. The grain size was estimated by Williamson-Hall.
基金Projects(U1202274,51004033,51204040)supported by the National Natural Science Foundation of ChinaProject(2012AA062303)supported by the National High Technology Research and Development Program of China+2 种基金Project(2012BAE01B02)supported by the National Science and Technology Support Program of ChinaProject(L2014096)supported by the Education Department of Liaoning Province,ChinaProject(N130702001)supported by the Fundamental Research Funds for the Central Universities,China
文摘The effects of pyrolysis mode and pyrolysis parameters on Cl content in alumina were investigated, and the alumina products were characterized by XRD, SEM and ASAP. The experimental results indicate that the spray pyrolysis efficiency is higher than that of static pyrolysis process, and the reaction and evaporation process lead to a multi-plot state of the alumina products by spray pyrolysis. Aluminum phase starts to transform into γ-Al2O3 at spray pyrolysis temperature of 600 °C, which is about 200 °C lower than that of static pyrolysis process. The primary particle size of γ-Al2O3 product is 27.62 nm, and Cl content in alumina products is 0.38% at 800 °C for 20 min.
文摘Zinc Oxide （ZnO） nanostructure were synthesized by precipitating Zinc Chloride and analyzed structurally and optically. Samples were prepared at different thickness （62, 66, 74, 86, 92, and 110 nm）, and substrate temperature kept at 400 ℃ in all cases. Compressed Nitrogen was used as a cartier gas. The samples of the ZnO films were characterized by X-ray diffraction （XRD）, and atomic force microscopy （AFM）. The XRD results indicated that the synthesized ZnO thin films have a pure wurtzite （hexagonal phase） structure. It can be seen that the highest texture coefficient was in （002） plan for nanostructure films. AFM measurement showed the grain size ranging from 62-86 nm. The optical band gap energy （Ee,） of ZnO nanostructure have two values for the same sample and the Eg decrease with increasing thickness utilizing the optical data using UV-Vis spectrophotometer.
文摘This paper analyzes the effects of nanoporous surface on heat transfer temperaments of assorted thermal conductingmaterials. A phenomenal proposal of wielding the surface roughness to ameliorate the heat transfer ratehas been discovered. The maximum increase of heat transfer rate procured by nanoporous layers is 133.3% higherthan the polished bare metals of surface roughness 0.2μm. This plays an imperative role in designing compact refrigerationsystems, chemical and thermal power plants. Experimental results picture a formidable upswing of58.3% heat transfer in chemically etched metals of surface roughness 3 μm, 133.3% in nanoporous surface of porosity75-95 nm formed by electrochemical anodization, and porosity of 40-50 nm formed by spray pyrolysis increasesthe heat transfer by 130%. Effects of porosity, flow velocity and scaling on the energy transfer are alsoscrutinized. This paper also analyzes the multifarious modes of nanoporous fabrication, to contrive both prodigiousand provident system.
