摘要
液相卤化银纳米微粒的共振散射光谱和发射光谱表明 ,AgCl和AgBr纳米微粒均在 3 3 0 ,40 0 ,470和 680nm处产生 4个共振散射峰 ,在 3 40 ,40 0和 470nm处产生三个荧光峰 .AgI纳米微粒在 3 40 ,40 0 ,43 7,470和 680nm处产生 5个共振散射峰 ;除在 3 40 ,40 0和 470nm处产生 3个荧光峰外 ,在 43 4nm处有一最强的荧光峰 .卤化银纳米微粒体系的浓度对共振散射信号的影响与浓度对荧光强度的影响一致 ,AgCl ,AgBr和AgI体系的共振散射光信号强度分别约为荧光信号的 110 ,13 0和80倍 ,即荧光与共振散射之间存在相关性 .提出了液相AgX纳米微粒荧光产生机理 ,解释了荧光与共振散射之间存在相关性的原因 .
The resonance scattering and emission spectra of AgX (X = Cl, Br and I) nanoparticles in liquid phase show that AgCl and AgBr nanoparticles all exhibit four resonance scattering peaks at 330, 400, 470 and 680 nm, and three fluorescence peaks at 340, 400 and 470 nm. While AgI nanoparticles produce five resonance scattering peaks at 340, 400, 437, 470 and 680 nm, a strongest fluorescence peak at 434 nm and three other peaks at 340, 400 and 470 nm. The influence of the concentration of the system of AgX nanoparticles on the resonance scattering signals is consistent with that on the fluorescence intensities. And the resonance scattering intensity of AgCl, AgBr and AgI systems is 110, 130 and 80 times of the fluorescence intensity, respectively. That is, the relationship between fluorescence and resonance scattering is exist. The fluorescence mechanism of AgX nanoparticles has been proposed, and the reason that there is the correlation between the fluorescence and resonance scattering has been explained.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2004年第14期1272-1276,J001,共6页
Acta Chimica Sinica
基金
国家自然科学基金 (No .2 0 3650 0 1 )
广西自然科学基金资助项目
