Preparation of silver nanoprisms using poly(N-vinyl-2-pyrrolidone) as a colloid-stabilizing agent and the effect of silver nanoparticles on the photophysical properties of cationic dyes

被引：51

作者：

Junior, AM ^{[1
]}

de Oliveira, HPM ^{[1
]}

Gehlen, MH ^{[1
]}

机构：

[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13566590 Sao Carlos, SP, Brazil

来源：

PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES | 2003年 / 2卷 / 09期

关键词：

D O I：

10.1039/b302943c

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

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.

引用

页码：921 / 925

页数：5

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