tailieunhanh - Báo cáo hóa học: " Pb(core)/ZnO(shell) nanowires obtained by microwave-assisted method"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Pb(core)/ZnO(shell) nanowires obtained by microwave-assisted method | Solis-Pomar et al. Nanoscale Research Letters 2011 6 553 http content 6 1 553 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Pb core ZnO shell nanowires obtained by microwave-assisted method F Solis-Pomar1 2 MF Melendrez3 R Esparza4 and E Perez-Tijerina1 2 Abstract In this study Pb-filled ZnO nanowires Pb core ZnO shell were synthesized by a simple and novel one-step vapor transport and condensation method by microwave-assisted decomposition of zinc ferrite. The synthesis was performed using a conventional oven at 1000 W and 5 min of treatment. After synthesis a spongy white cottonlike material was obtained in the condensation zone of the reaction system. HRTEM analysis revealed that product consists of a Pb- core with fcc cubic structure that preferentially grows in the 111 direction and a hexagonal wurtzite ZnO- Shell that grows in the 001 direction. Nanowire length was more than 5 pm and a statistical analysis determined that the shell and core diameters were and nm respectively. Experimental structural details and synthesis mechanism are discussed in this study. Introduction One-dimensional 1D nanostructures as wires rods belts and tubes have attracted the attention of researchers because of their intrinsic properties and novel applications in various fields 1 . There are several nanostructured materials that are nowadays being widely used these are based on those of zinc oxide which has excellent properties such as a wide energy band gap eV 2 a large exciton binding energy 60 meV at room temperature 3 high optical gain 300 cm-1 4 high mechanical and thermal stabilities 5 and radiation hardness 6 . Because of these properties ZnO nanostructures have been applied as activated material in the electronic devices manufacture . gas sensors nanoresonators solar cells waveguide field emitters nanocantilevers nanolasers transistors and optoelectronic devices 7-14 . Furthermore this .