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Structural and Optical Properties of Hydrogen-ion-implanted ZnO Nanorods
Y.-B. Lee,C.-H. Kwak,S.-Y. Seo,김선효,C.-I. Park,B.-H. Kim,S.-H. Park,최용대,한상욱 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.61
We investigated the micro-structural and the optical properties of H+-ion-implanted ZnO nanorods by using X-ray absorption fine structure (XAFS) measurements at the Zn K edge and photoluminescence (PL) measurements. Vertically-aligned ZnO nanorods were synthesized using metal-organic chemical-vapor deposition and were vertically implanted with hydrogen ions (H+) at an energy of 90 keV and a total flux of 1016 particles/cm2. Scanning electron microscopy measurements showed no detectable defects existing in the H+-ion-implanted ZnO nanorods. However,transmission electron microscopy measurements revealed that an amorphous phase existed, particularly near the top parts of the nanorods. X-ray diffraction and XAFS measurements provided further evidence that the nanorods had structural defects due to the H+-ion implantation. PL measurements showed that the transition peak intensity of the H+-ion-implanted ZnO nanorods was decreased dramatically due to the ion implantation.
A Large Quantity of ZnO Nanorods Grown at Room Temperature
S.-H. Park,C.-H. Kwak,S.-Y. Seo,김선효,B.-H. Kim,C.-I. Park,Y.-W. Park,한상욱 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.1
High-quality ZnO nanorods were synthesized on stainless-steel substrates at room temperature in NaCl solutions with NaCl concentrations of 3.5-5.0 wt%. The ZnO nanorods were grown from a Zn film on a stainless-steel substrate in a NaCl solution without any extra process. Field-emission scanning electron microscopy images showed that the ZnO formed into rods with a uniform size at a NaCl concentration of 3.5 - 5.0 wt% while the ZnO became plates for NaCl concentration above 9 wt%. The mean sizes of the nanorods grown at 30 and 40℃ were about 100 and 70 nm, respectively. High-resolution transmission electron microscopy and selected area electron diffraction measurements demonstrated that the nanorods had a well-ordered wurtzite structure without any extra phase. Extended X-ray absorption fine structure measurements revealed that the initial Zn film on the stainless-steel substrate had a hexagonal close-packed structure and ¯nally became nanorods with a wurtzite structure in a sea water environment. The zinc likely obtained oxygen from the solution, and Na+ and Cl¡ ions acted as catalysts for the ZnO crystallization.