Time-dependent control of hole-opening degree of porous ZnO hollow microspheres.
Well-designed, monodispersed porous ZnO hollow microspheres with controlled hole-opening were successfully synthesized by a facile two-step solution route at low temperature. The hollow microspheres having average diameter of 3-4 μm showed time-dependent hole-opening, i.e. 4-100% for 15-75 min. The hole-opening percentage increases linearly with time until complete opening. The ZnO hollow microspheres also exhibited a high surface area (34 m(2) g(-1)), a large pore volume (0.19 cm(3) g(-1)) and an average pore diameter of 3.8 nm. A plausible growth mechanism for the formation of ZnO hollow microspheres was also proposed.
Department of BIN Fusion Technology, Chonbuk National University, Jeonju 561-756, Republic of Korea.
Nirmalya
N
Tripathy
Rafiq
R
Ahmad
Han-Sol
HS
Jeong
Yoon-Bong
YB
Hahn