Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Room-temperature nonequilibrium growth of controllable ZnO nanorod arrays | Li et al. Nanoscale Research Letters 2011 6 477 http content 6 1 477 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Room-temperature nonequilibrium growth of controllable ZnO nanorod arrays Qian Li Kui Cheng Wenjian Weng Chenlu Song Piyi Du Ge Shen and Gaorong Han Abstract In this study controllable ZnO nanorod arrays were successfully synthesized on Si substrate at room temperature approx. 25 C . The formation of controllable ZnO nanorod arrays has been investigated using growth media with different concentrations and molar ratios of Zn NO3 2 to NaOH. Under such a nonequilibrium growth condition the density and dimension of ZnO nanorod arrays were successfully adjusted through controlling the supersaturation degree . volume of growth medium. It was found that the wettability and electrowetting behaviors of ZnO nanorod arrays could be tuned through variations of nanorods density and length. Moreover its field emission property was also optimized by changing the nanorods density and dimension. Introduction One-dimensional 1D nanostructures such as nanorods nanowires and nanotubes have extensively been investigated in recent years for their excellent optoelectronic electronic mechanical magnetic photochemical properties etc. 1-6 . The density morphology crystal size and dimension of 1D nanostructure arrays are very important as they strongly determine the properties of the arrays such as wettability field emission property photochemical property etc. 7-9 . Muller et al. 10 have found that the contact angle increased as the density of Ge nanopyramids grown on Si substrate increased. Lau et al. 11 studied the wettability of poly-coated carbon nanotube array and demonstrated the contact angle increased when the height of nanotube increased. Among various nanomaterials zinc oxide ZnO nanostructure has attracted much attention mainly because of its wide direct band gap eV large excitation binding energy 60 meV
