中文摘要：

分别制备了以L半胱氨酸（L-cyst．）或以巯基乙酸（TGA）保护的银纳米颗粒，并用紫外一可见分光光度法和透射电子显微技术（TEM）对两种不同状态的银纳米颗粒的结构作了表征。由其吸收光谱图显示，L-cyst．和TGA保护的银纳米颗粒的吸收峰依次位于384nm和392nm波长处；由TEM的检测结果表明：上述2种形态银纳米颗粒的粒度大小依次在10-40nm和20～30nm范围内。试验中发现，以L-cyst．保护的银纳米颗粒与曙红Y之间有明显的相互作用，导致其吸收峰从384nm红移至395nm；以TGA保护的银纳米颗粒与曙红Y之间未见有相互反应。初步探讨了其作用机理，认为系由于结合于银纳米颗粒表面的L-半胱氨酸分子所带的正电荷与曙红Y分子上的负电荷之间的静电作用的结果。

英文摘要：

Silver nanoparticles were prepared under the protection of either L-cysteine （L-cyst.） or thioglycollic acid （TGA）. The structures of these 2 different states of silver nanoparticles were characterized by UV-VIS spectrophotometry and transmission electron microscope （TEM）. As shown by the UV-VIS absorption spectra, absorption maxima at 384 nm and 392 nm were found for the L-cyct. protected and TGA-protected silver nanoparticles respectively. It was shown by the results of TEM study, the sizes of the L-cyst. -protected and TGA- protected Ag-nanoparticles were found in the ranges of 10--40 nm and 20--30 nm respectively. It was found that significant interaction was observed between the L-cyst.-protected Agnanoparticles and eosin Y, giving a bathochromic shift of absorption maximum from 384 nm to 395 nm; and that no interaction between the TGA- protected Ag-nanoparticles and eosin Y was observed. Electrostatic action between the positively charged L-cyst. molecules at the surface of Ag-nanoparticles and the negatively charged eosin Y molecules was proposed as the ehemism of the interaction.