通过醇盐不完全水解制备了含有有机基团(O-C2H5)的0.5Al2O3-0.5P2O5-100SiO2凝胶,在氮气中加热到300～700℃使其中的有机基团炭化,得到镶嵌在凝胶玻璃中不同尺寸的碳纳米颗粒.利用高分辨电镜、X射线衍射和喇曼光谱研究了碳纳米颗粒的结构,发现凝胶玻璃中的碳颗粒为非晶碳纳米颗粒.测试了它们的吸收光谱,发现了由于量子限域效应引起的吸收边的移动.在532um Nd:YAG激光的激发下镶嵌有碳纳米颗粒的凝胶玻璃有一强的室温发光,发光峰在586um左右.发光峰几乎不随碳纳米颗粒尺寸的变化而变化.这种发光产生于碳纳米颗粒的表面或碳颗粒和凝胶网络的界面.
0.5Al2O3-0.5P2O5-100SiO2 gels containing organic group (OC2H5) were synthesized through partial hydrolysis of alkoxide.
The gels were calcined at 300～700℃ in N2 atmosphere, in which－OC2H5 was carbonized to form carbon nanoparticles with
various sizes. Their absorption and photoluminescence spectra were measured. The absorption edge shifts to the higher-energy side as the
size of the carbon particle decreases. This phenomenon was interpreted in terms of a quantum confinement effect of electron and hole in the
carbon nanoparticles. The gel glasses doped with carbon nanoparticles show a strong and broad room-temperature photoluminescence with a peak
located around 586nm under the excitation of 532nm line of a Nd:YAG laser. The position of photoluminescence peaks shifts hardly with changing
the size of carbon nanoparticles. The photoluminescence spectra are originated from the surface of carbon nanoparticles or interfacial
layer between it and gel matrix. The carbon nanoparticles are amorphous carbon nanoparticle in the gel glasses by the X-ray diffraction,
high-resolution transmission electron microscopy and Raman spectra.
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