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nano structured films induced by laser plasma ionization deposition
摘要： This research explores the optical properties of a large group of silicon/silica nanofibrous thin films. A picosecond pulse laser was employed for indirect deposition of ablated silicon on glass substrates. Prominent parameters such as laser power, repetition rate, pulse duration and scanning speed were changed to vary the structural and compositional properties of synthesized nanofibrous thin films. Transmission and specular reflection measurements along with material characterization techniques, Raman and FTIR, were employed for better interpretation of the results. By and large, an increase in the values for repetition rate and scanning speed produced a corresponding increase in optical data intensity, while an increase in power and pulse duration produced a drop in the same data. The results show that degree of oxidation and inherent porous structure are driving the light interaction in thin samples, as indicated by the changes in intensity or spectrum shape. Observation of these trends enabled us to apply tunable fabrication procedures to obtain desired groups of nanofibrous thin films. Electron and optical microscopy as well as background knowledge certify tangled nano-wired morphology in most cases. Structures with highly desirable usages, such as in sensing technology, can be optimized by their porosity, density and thickness.
关键词： Optical spectroscopy,Thin film,Pulse duration,Pulsed laser,Nano-fibers
更新于2025-09-23 15:19:57
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Synthesis and characterization of electro-spun TiO <sub/>2</sub> and TiO <sub/>2</sub> -SnO <sub/>2</sub> composite nano-fibers for application in advance generation solar cells
摘要： Due to rapid progressive research in the field of nano-technology, nanostructures are attaining tremendous deliberation. Precisely, among these, nano-fibers have accumulated unprecedented attention over the last few years owing to their superior properties such as large surface area to volume ratio. For advance generation solar cells, nano-fibers of metal oxides such as TiO2 have been widely employed as a working anode but due to the disadvantages of recombination of electrons, their coupling with other metal oxides is necessary to render them useful. This work reports the successful fabrication of TiO2, TiO2/SnO2 nano-fibers based film and study of the effect of polymer concentration upon it. The crystal structure of synthesized fibers was investigated using XRD, the morphology and chemical composition was analyzed using SEM and EDX, optical properties and chemical properties were studied using UV-VIS spectrophotometer and FT-IR while the electrical properties were studied using Hall Effect measurement system. It was revealed that the prepared TiO2-SnO2 nano-fibers exhibit enhanced conductivity, larger band-gap with enhanced photo voltaic properties than TiO2 nano-fibers. The prepared TiO2/SnO2 nano-fibers based solar cells provide an improved efficiency of 4.81% as compared to 1.8% efficiency of bare TiO2 nano-fibers.
关键词： nano-fibers,titanium oxide,tin oxide,solar cells,electro-spinning
更新于2025-09-16 10:30:52