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Development and Devise Application of High-Efficiency Enhanced Photochemical Processes by Nanostructured Metal Films and Fine Metal Particles

纳米结构金属薄膜和细金属颗粒高效增强光化学过程的开发和设计应用

基本信息

批准号：
18350072
负责人：
KAWASAKI Mitsuo
金额：
$ 7.87万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

项目摘要

(1) Devise for Enhanced Light AbsorptionA fully conductive bulk Ag film, when sputter-gfown on a substrate directly exposed to the glow dischargeplasma, developed unique nanoscale surface roughness features that caused distinct single-nanoparticle-liksurface plasmon (SP) scattering. This highly reflective SP scatterer, capable to give substantial light scattering with minor surface roughness, functioned as a superior reflector in a novel nanospaced trilayer structure for high-efficiency light-absorption enhancement. The small base (intrinsic) absorptance less than 0.3% of a thin light absorber layer atop was thus easily enhanced by more than 10 times in a wide range of the visible region.(2). Photo-Electric Conversion Based on Enhanced Light Absorption SystemThe above system for enhanced light absorption was succefully applied to photoelectric conversion with a thin layer of cyanine dyes as the otherwise weak light absorber. The overall photocurrent generation efficiency was enhanced b … More y 10 times or more, in agreement with the improved light harvesting efficiency.(3). Laser Synthesis of Metal NanoparticlesThe fragmentative decomposition of ketone-suspended Ag2O micropowders (most preferably in acetone), induced by 1064 nm nanosecond laser irradiation as a single-pulse event at the required minimum laser fluence as low as □0.1J/cm2, proved to offer a highly productive pathway to novel Ag nanoparticles (AgNPs) with many unique properties. The maximum NP production rate reached 2.5mg/min at the input laser power of only ~0.5W, and the product AgNPs, typically 10-20nm in diameter, exhibited excellent dispersity in ketone without any intentional addenda, thus being self-stabilized for concentrations up to ~5wt % (in acetone) or to more than 20wt% (in γ-butyrolactone).(4) Surface-Plasmon-Induced Enhanced EmissionWe found that closely packed submicro-scale Ag islands (each ~370nm across and~90nm in height on the average) produced not only extremely short-range fluorescence enhancement for rhodamine dye (RhB) placed only ~1nm away from the metal surface, but also a novel, long-range enhancement for the same dye for the metal-molecule distance up to ~50nm. The net enhancement factor for the spin-coated RhB, with a fluorescence quantum yield of ~2% in the absence of Ag islands, was as high as~20-folds at the metal洋olecule distance of ~30nm. Less

(1) Devise for Enhanced Light AbsorptionA fully conductive bulk Ag film, when sputter-gfown on a substrate directly exposed to the glow dischargeplasma, developed unique nanoscale surface roughness features that caused distinct single-nanoparticle-liksurface plasmon (SP) scattering. This highly reflective SP scatterer, capable to give substantial light scattering with minor surface roughness, functioned as a superior reflector in a novel nanospaced trilayer structure for high-efficiency light-absorption enhancement. The small base (intrinsic) absorptance less than 0.3% of a thin light absorber layer atop was thus easily enhanced by more than 10 times in a wide range of the visible region. (2). Photo-Electric Conversion Based on Enhanced Light Absorption SystemThe above system for enhanced light absorption was succefully applied to photoelectric conversion with a thin layer of cyanine dyes as the otherwise weak light absorber. The overall photocurrent generation efficiency was enhanced b … More y 10 times or more, in agreement with the improved light harvesting efficiency. (3). Laser Synthesis of Metal NanoparticlesThe fragmentative decomposition of ketone-suspended Ag2O micropowders (most preferably in acetone), induced by 1064 nm nanosecond laser irradiation as a single-pulse event at the required minimum laser fluence as low as □0.1J/cm2, proved to offer a highly productive pathway to novel Ag nanoparticles (AgNPs) with many unique properties. The maximum NP production rate reached 2.5mg/min at the input laser power of only ~0.5W, and the product AgNPs, typically 10-20nm in diameter, exhibited excellent dispersity in ketone without any intentional addenda, thus being self-stabilized for concentrations up to ~5wt % (in acetone) or to more than 20wt% (in γ-butyrolactone). (4) Surface-Plasmon-Induced Enhanced EmissionWe found that closely packed submicro-scale Ag islands (each ~370nm across and~90nm in height on the average) produced not only extremely short-range fluorescence enhancement for rhodamine dye (RhB) placed only ~1nm away from the metal surface, but also a novel, long-range enhancement for the same dye for the metal-molecule distance up to ~50nm. The net enhancement factor for the spin-coated RhB, with a fluorescence quantum yield of ~2% in the absence of Ag islands, was as high as~20-folds at the metal molecule distance of ~30nm. Less