The electric transport properties of an individual vertical multiwall carbon nanotube (MWCNT) were studied in situ at room temperature in a scanning electron microscope chamber. It was found that the single MWCNT has a large current-carrying capacity, and the maximum current can reach 7.27 mA. At the same time, a very low resistance of about 34.4 ohms and a high conductance of about (460-490)G0 were obtained. The experimental observations imply a multichannel quasiballistic conducting behavior occurring in the MWCNTs with large diameter, which can be attributed to the participation of multiple walls in electrical transport and the large diameter of the MWCNTs.

Zinc peroxide (ZnO 2 ) hollow spheres of 100-200 nm diameter were synthesized by a simple hydrothermal method by using H 2 O 2 and ZnO powder as reagents without the assistance of any surfactant. O 2 bubbles in situ generated by the decomposition of H 2 O 2 served as a soft template in the formation of ZnO 2 spheres. Zinc oxide (ZnO) hollow spheres were obtained by heat treatment of ZnO 2 hollow spheres at 180 °C for 10 h in air. The products were characterized by XRD, FT-IR, TEM, HRTEM, and FESEM. The transition temperature of ZnO 2 to ZnO was determined to be 229 °C by TG-DTA. Photoluminescence (PL) properties of the products were investigated and the origin of the two peaks at 392 and 448 nm in the PL spectrum of ZnO 2 was discussed. Furthermore, the growth mechanism of the ZnO 2 hollow spheres was discussed in detail.