权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Study on electron and energy transfer in highly organezed aggregates by quantum beams

量子束研究高度有序聚集体中的电子和能量转移

基本信息

批准号：
04453164
负责人：
ISHIGURE Kenkichi
金额：
$ 5.12万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

项目摘要

Langmuir Blodgett films of cyanin dye and arachiadic acid on the substrates or quarts were found to decompose very little by irradiation of UV and visible light, but to decompose markedly with gama radiation and electron beams in the atmosphere of Ar to yield very large G values. This large G value was considered to arize from the energy transfer from the substrate to the LB layrs, but was finally attributed to the attack of the radiolysis species of Ar in the gas phase. Gamma radiolysis and pulse radiolysis experiments of the cyanin dye solutions revealed that the major contribution to the decomposition of the dye comes from the Ar^+ ion species.Observation of the LB membranes with fluorescence microscope showed that the decomposition of the J aggregates of the dyes induced by radiation is largely affected by the domain structures of the J aggregates in the dye membranes, and the highly developped domains of the J agregates was found from the observation of the LB films to have highly … More ordered structure of the dye molecules and it was inferred that electron and energy transfers between the highly ordered and the less ordered molecules or the monomers of the dyes are deeply related to the decomposition reactions of the dyes.On the other hand, the LB membranes of the arachiadic acid on the substrates of silicon were prepared and their XPS spectra showed that the strong chemical interactions exist between the arachiadic acid molecules and the silicon atoms on the surface of the substrates. Based on this experimental results, the thin membranes of dioctadecyl-dithiocarbamate (DOTC) on the substrate of GaAs were prepared using electrochemical deposition method to cheek the possibility of stabilizing the dangling bonds of the GaAs surfaces with the sulfur atoms in the DOTC layrs that become stable and thin isulator. The XPS spectra of the membranes showed that chemical bonds are formed between the sufur atoms in DOTC and the As atoms in the surface of GaAs, and the density of the surface states of the samples was found from their photoluminescence spectra to be reduced markedly with this treatment. Less

蓝染料和花生四氢酸在衬底或石英上的朗缪尔布洛吉特膜在紫外光和可见光的照射下几乎不分解，但在Ar气氛中随着伽马辐射和电子束的照射而显著分解，产生很大的G值。这种大的G值被认为是从底物到LB层的能量转移导致的，但最终归因于气相中Ar的辐解物种的攻击。染料溶液的伽马辐解和脉冲辐解实验表明，染料分解的主要贡献来自于Ar~(++)离子物种。荧光显微镜观察表明，染料膜中J聚集体在辐射诱导下的分解很大程度上受染料膜中J聚集体的区域结构的影响，从观察到的LB膜中发现J聚集体的高度发达的区域具有很高的…另一方面，制备了花生四氢酸在硅衬底上的LB膜，其XPS光谱表明花生四氢酸分子与衬底表面的硅原子之间存在着较强的化学作用。在此基础上，采用电化学沉积的方法，在砷化镓衬底上制备了双十八烷基二硫代氨基甲酸酯(DOTC)薄膜，考察了DOTC层中硫原子稳定表面悬键的可能性，使DOTC层中的硫原子成为稳定而薄的异构体。薄膜的XPS谱表明，DOTC中的硫原子与GaAs表面的As原子之间形成了化学键，从样品的光致发光光谱可以看出，样品的表面态密度明显降低。较少