【摘要】 以 (AgBr) m 团簇作晶种 ,在柠檬酸钠存在条件下 ,(AgBr) m 团簇表面结合的Ag+被光化学还原而获得土红色的液相 (AgBr) 核·(Ag) 壳 纳米粒子 .研究了 (AgBr) 核·(Ag) 壳 纳米粒子的光谱特性 ,在 51 2nm处有最强共振散射峰 ,在41 0nm处产生一个吸收峰 .结果表明 ,(AgBr) 核·(Ag) 壳 纳米粒子的形成是导致51 2nm共振光散射的根本原因 .更多还原

【Abstract】 Under the conditions of (AgBr) m crystal seed and tri sodium citrate photoreducer,the Ag + ions on the surface of (AgBr) m crystal seed reduce to Ag photochemically.And thus soil red (AgBr) core ·(Ag) shell nanoparticles were obtained.The mean diameter is 25 nm for (AgBr) core ·(Ag) shell and 100 nm for (AgBr) m .It exhibits a strongest resonance scattering peak at 512 nm,and an absorption peak at 410 nm.The effect of illumination time,AgNO 3,NaBr and tri sodium citrate concentration on the I 512 nm ,and A 410 nm has been studied.The results indicate that the formation of (AgBr) core ·(Ag) shell nanoparticle is the fundamental cause for the appearence of resonance scattering peak at 512 nm.更多还原