Title
Luminescent Silicon Nanoparticles Surface-Modified with Chiral Molecules
Author
Mari Miyano, Takayuki Nakanishi, Satoshi Wada, Yuichi Kitagawa, Akira Kawashima, Koji Fushimi, Yasuhiro Morisaki, Yoshiki Chujo, Yasuchika Hasegawa
Year
2015
Journal
Journal of Photopolymer Science and Technology
Abstract
Active surface of luminescent silicon nanoparticles was terminated by the photochemical reaction of chiral molecules, (S)- or (R)-5-allyl-2-oxabicyclo[3,3,0]oct-8-ene ((S) - or (R) - AOBE) under UV light. The particle size and shapes were characterized using Transmission Electron Microscope (TEM). The average particle size was found to be 5.7 nm. Circular dichroism (CD) signals with large dissymmetry factors from silicon nanoparticles terminated with (S) - and (R) - AOBE were observed at around 300 nm and 500 nm, which were much larger than those of (S)- and (R)-AOBE molecules. The silicon nanoparticles covered with (S)- or (R)-AOBE provided red luminescence based on the indirect electronic transition. Effective circular polarized luminescence (CPL) was not observed from indirect transition band.
Instrument
J-1500
Keywords
Circular dichroism, Nanostructures, Circularly polarized luminescence, Materials