Enhanced photoluminescence from Si nano-organosols by functionalization with alkenes and their size evolution
Enhanced photoluminescence from Si nano-organosols by functionalization with alkenes and their size evolution
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DOI：
10.1021/cm0519636
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发表时间：
2006-02-07
影响因子：
8.6
通讯作者：
Kimura, K
中科院分区：
文献类型：
--
作者：
Liu, SM;Yang, Y;Kimura, K
采用湿法合成了2 ~ 16 nm的硅纳米颗粒。其中SiO非晶粉体在1000℃下退火，在氢氟酸中蚀刻，表面用烯烃改性。将纳米颗粒表面烷基终止后，采用粒径选择沉淀法将纳米颗粒分离成均匀粒径的组分。透射电镜显示，经烯烃处理后的硅纳米颗粒分散良好，结晶度高。在室温下观察到800 ~ 500 nm范围内的光致发光。由于表面功能化，光致发光强度显著增强。此外，由于量子约束效应，随尺寸减小，选定尺寸的纳米颗粒的PL峰能量向蓝色偏移。并将实验结果与理论预测结果进行了比较，结果与模型计算的总体趋势一致。
Silicon nanoparticles ranging from 2 to 16 nm were synthesized by a facile wet chemical route. in which SiO amorphous powder was annealed at 1000 degrees C, etched in hydrofluoric acid, and surface modified by alkene. After alkyl-termination of the particle surfaces, size selective precipitation technique was applied to separate the nanoparticles into uniform sized fractions. Transmission electron microscopy showed well-dispersed and highly crystalline silicon nanoparticles after the treatment by alkene. Visible room-temperature photoluminescence in the range 800-500 nm was observed from these nanoparticles. The photoluminescence intensity has significantly been enhanced by the surface functionalization. Moreover, the PL peak energy of the size-selected nanoparticles shifted to blue as the size decreased due to quantum confinement effect. The experimental result was also compared with the theoretical predictions and was found to follow the general trend of the model calculations.