Open AccessSYNTHESIS AND QUANTUM SIZE EFFECT OF CARBON NANOPARTICLES DOPED IN GEL-GLASSES
Author(s) -
Heqing Yang,
Xuan Wang,
Shouxin Liu,
Yongfang Li,
Liangying Zhang,
Xi Yao
Publication year - 2001
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.50.341
Subject(s) - materials science , nanoparticle , sol gel , absorption (acoustics) , carbonization , particle size , absorption edge , potential well , amorphous solid , carbon fibers , doping , chemical engineering , quantum dot , nanotechnology , scanning electron microscope , composite material , crystallography , chemistry , band gap , composite number , optoelectronics , engineering
C-nanoparticles with a diameter smaller than 60 nm in xAl2O3-xP2O5-100SiO2(x=0.25—2) gel-glasses have been prepared by sol-gel process. The gels synthesized through partial hydrolysis of PO(OC2H5)3,Al(NO3)3·9H2O and Si(OC2H5)4 were heated at 400℃ or 450℃ in air atmosphere or from 300 to 700℃ in N2 atmosphere, in which —OC2H5 were carbonized to form nanosized C particles. These C-nanoparticles-doped gel-glasses were characterized by optical absorption and TEM.The optical absorption edge shifts to the higher-energy side as the size of the C particle decreases. This phenomenon is interpreted in terms of a quantum confinement effect of electron and hole in the C-nanoparticles. The C-nanoparticles structures were found to be amorphous carbon in the gel-glasses by electron diffraction pattern.