A wealth of superfine single-crystal hollow cuprous
oxide (Cu2O) spheres with nanoholes have been prepared for the first time with glucose as the reducing
agent and gelatin as a soft template. The mechanism of the formation of these
hollow crystals with nanoholes has been studied, and the UV–visible absorption
spectrum has been used to resolve the excitonic or interband transitions of the hollow
Cu2O
spheres. The band gap of the products calculated from the UV–vis spectra is as large as
2.67 eV, which is ascribed to the decrease of the overall crystal size and the hollowing of the
Cu2O
spheres with nanoholes.
Multiwalled carbon nanotubes (MWNTs) purified by sulfuric acid and nitric acid were functionalized with polyimide (PI) via an in situ polymerization in N,N-diemethyformamide. The transmission electron microscopic and scan electron microscopic images showed that the functionalized MWNTs were wrapped by PI. The results of infrared, Raman, and UV-vis display that there was --stacking interaction between imide and benzene ring in PI and the graphitic sidewalls of the MWNTs. The thermogravimetric analysis and differential scanning calorimetry results indicate that the thermal stability of the functionalized MWNTs with PI was improved. POLYM. COMPOS., 28:36 -41, 2007.
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