摘要
以磷酸三乙酯、硝酸铝和正硅酸乙酯为原料 ,通过它们的不完全水解制备了含有有机基团的xAl2 O3 xP2 O5 10 0SiO2 (x =0 .2 5— 3)凝胶 .在空气中在 40 0℃或 45 0℃或在氮气中从 30 0到 70 0℃对凝胶进行热处理 ,使凝胶中的有机基团炭化 ,从而得到含有碳纳米颗粒的xAl2 O3 xP2 O5 10 0SiO2 (x =0 2 5— 2 )凝胶玻璃 .利用吸收光谱和TEM对含有碳纳米颗粒的凝胶玻璃进行了表征 ,结果发现随着碳纳米颗粒尺寸的减小吸收边向高能边移动 ,这种现象是由碳纳米颗粒中电子和空穴的量子限制效应引起的 .电子衍射表明凝胶玻璃中的纳米碳为非晶碳 .
C-nanoparticles with a diameter smaller than 60 nm in xAl(2)O(3)-xP(2)O(5)-100SiO(2)(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). 9H(2)O and Si (OC2H5)(4) were heated at 400 degreesC or 450 degreesC in air atmosphere or from 300 to 700 degreesC in N-2 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.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2001年第2期341-346,共6页
Acta Physica Sinica
