摘要
用激光散射(LLS)及透射电镜(TEM)技术研究了Te(Ⅳ) I- RhB水溶液中液相纳米粒子在自然状态下的聚集行为及粒径分布,并用共振瑞利散射光谱、荧光发射光谱、紫外 可见光谱对该液相纳米体系的光谱性质进行了表征.结果表明:在0.8mol/LHCl介质中,当Te(Ⅳ)浓度为4、8、12、16、20μg/L时,Te(Ⅳ) I- RhB体系平均粒径分别为192、228、262、278、300nm;纳米粒子的形成及其聚合行为导致RhB在558nm处的吸收峰(A558)的减色效应及598nm处的发射峰(F598)的荧光猝灭和623nm处的共振散射峰(I623)增强,并与Te(Ⅳ)浓度呈良好的线性关系;体系在623nm处的散射强度I1/3与其粒径成正比.用等离子体原子发射光谱(ICP)、元素分析(EA)等手段对该纳米粒子进行表征,确定了其最简分子式为(RhB)4(TeI8).
The resonance scattering (RS), fluorescence, adsorption spectra and mean diameters of Te(Ⅳ)- I^--RhB liquid phase nanoparticles under different conditions were studied. The results show that fluorescence quenching and enhancement of RS intensity were obviously observed due to the formation of [(RhB)_4(TeI_8)]_n nanoparticles. Their average diameters increased with the concentration of Te (Ⅳ) in the range of 0—20 μg/L. The maximum resonance scattering peak was at 623 nm. The cube root of I_(623 nm/623 nm) was proportional to the average diameter of the nanoparticles. The nanoparticles were characterized by ICP-AES, EA. The results indicate that the molecular formula was (RhB)_4(TeI_8).
出处
《感光科学与光化学》
CAS
CSCD
2005年第2期144-150,共7页
Photographic Science and Photochemistry
基金
国家自然科学基金资助项目(20271022)
广东省自然科学基金资助项目(010369).
关键词
碲
罗丹明B
液相纳米粒子
激光散射
光谱效应
Te
RhB
liquid phase nanoparticles
laser light scattering
spectral properties
