Silicon Nanocrystals Prepared by Femtosecond Laser Ablation in solution under different ablation time
Spherical silicon(Si)nano-crystals(NCs)were prepared throughpulsed femtosecond laser ablatingof porous siliconpowerimmersed in 1-hexene.Compared to bulk Si,Raman spectra of Si NCs showa redshift and an asymmetrical broadening.High resolution transmission electron microscopy measurements showthatSiparticles were dispersed uniformly in 1-hexene.FTIRspectra showed that the Si nanoparticles were passivated by organic molecules.Based onthe room temperaturephotoluminescence(PL)excitationand PLdecay curves,we assignblue PL to localized excitons throughoxygen associatedsurfacestatesfromthe colloidsSi NCs.Because ofthe good surface passivation forcolloidal siliconNCs,the quantum yield increases with extending ablation time.
Jingyang Yu Huilian Hao Rong Zhang Wenxiang Zheng Wenshun Wu
School of Material Engineering,Shanghai University of Engineering Science,Shanghai,China
国际会议
上海
英文
1-6
2017-12-28（万方平台首次上网日期，不代表论文的发表时间）