Machulek Junior Amilcar, de Oliveira Hueder Paulo Moisés, Gehlen Marcelo Henrique
Instituto de Química de São Carlos, Universidade de São Paulo, 13566-590 São Carlos, SP, Brasil.
Photochem Photobiol Sci. 2003 Sep;2(9):921-5. doi: 10.1039/b302943c.
The synthesis of silver nanoprisms in aqueous solution using poly(N-vinyl-2-pyrrolidone) (PVP) with different molecular weights (29, 55 and 1300 kg mol(-1)) as a stabilizing agent is described. Low molecular weight PVP (55 kg mol(-1)) is indicated for the preparation of a stable blue solution containing Ag nanoprisms via extended irradiation of a yellow colloidal solution of nanospheres with polychromatic visible light. The fluorescence properties of some cationic dyes (acridine, 9-aminoacridine, Nile Blue and auramine), free and bound to poly(methacrylic acid), have been studied in the presence of different shaped Ag colloidal particles in solution. Only auramine displays an amplification of the fluorescence signal with increasing colloid concentration, while the fluorescence of the other dyes is quenched by interaction with the polymer-stabilized metal nanoparticles.
描述了使用不同分子量（29、55和1300 kg mol(-1)）的聚（N-乙烯基-2-吡咯烷酮）（PVP）作为稳定剂在水溶液中合成银纳米棱柱的过程。低分子量PVP（55 kg mol(-1)）适用于通过用多色可见光对纳米球的黄色胶体溶液进行长时间照射来制备含有银纳米棱柱的稳定蓝色溶液。研究了一些阳离子染料（吖啶、9-氨基吖啶、尼罗蓝和金胺）在溶液中与不同形状的银胶体颗粒存在时，游离和与聚（甲基丙烯酸）结合时的荧光特性。只有金胺随着胶体浓度的增加显示出荧光信号的放大，而其他染料的荧光则通过与聚合物稳定的金属纳米颗粒相互作用而猝灭。
