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首页> 外文期刊>Berichte der Bunsengesellschaft fur Physikalische Chemie >Photochemical Formation of Colloidal Gold Particles in Chitosan Films
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Photochemical Formation of Colloidal Gold Particles in Chitosan Films

机译：壳聚糖膜中胶体金颗粒的光化学形成

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摘要

Thin films of chloroauric acid salt of chitosan (CTOAu films) were photolyzed with 253.7 nm light. On irradiating with UV light in air at room temperature, the CTOAu film first became yellow-blue colored due to the formation of colloidal gold. When irradiation was continued, the irradiated surface of the film finally changed into clear gold mirror. Primary photochemical products are assumed to be gold atom, quaternary ammonium chloride of chitosan and chlorine. With aids of UV-visible absorption spectroscopy, X-ray photoelectron spectroscopy, and scanning electron microscopy, aggregation of small gold particles to form colloidal gold and gold metal film has been investigated. It has been found that the aggregation state of small gold particles is controlled by reaction conditions; temperature, evacuation, the amount of chloroauric acid. When the CTOAu film was photolyzed in vacuum at room temperature, the gold paniculate film was formed. Irradiation at liquid nitrogen temperature resulted in absorption spectrum characterized by the structureless absorption extending from λ = 400 nm to shorter wavelength. However, an introduction of air after photolysis brought about the development of the broad colloidal absorption band.
机译：壳聚糖氯金酸盐的薄膜（CTOAu薄膜）用253.7 nm的光进行光解。在室温下，用紫外线在空气中辐照时，CTOAu膜由于形成胶体金而首先变成黄蓝色。当继续照射时，膜的照射表面最终变为透明的金镜。假定主要的光化学产物为金原子，壳聚糖的季铵氯化物和氯。借助于紫外-可见吸收光谱，X射线光电子能谱和扫描电子显微镜，研究了小金颗粒的聚集以形成胶体金和金金属膜。已经发现，小金颗粒的聚集状态受反应条件的控制。温度，疏散，氯金酸的量。当CTOAu膜在室温下在真空中光解时，形成金颗粒膜。液氮温度下的辐照产生吸收光谱，其特征在于无结构吸收从λ= 400 nm延伸至较短波长。然而，光解后引入空气导致了宽的胶体吸收带的发展。

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