This article surveys recent developments in the rational synthesis of single-crystalline zinc oxide nanowires and their unique optical properties. The growth of ZnO nanowires was carried out in a simple chemical vapor transport and condensation (CVM system. Based on our fundamental understanding of the vapor-liquid-solid (VLS) nanowire growth mechanism, different levels of growth controls (including positional, orientational, diameter, and density control) have been achieved. Power-dependent emission has been examined and lasing action was observed in these ZnO nanowires when the excitation intensity exceeds a threshold (~40 kW cm-2). These short-wavelength nanolasers operate at room temperature and the areal density of these nanolasers on substrate readily reaches 1 X 1010 cm-2. The observation of lasing, fabricated mirrors indicates these single-crystalline, well-facetted nanoaction in these nanowire arrays without any wires can function as self-contained optical resonance cavities. This argument is further supported by our recent near-field scanning optical microscopy (NSOM) studies on single nanowires.
AD -Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA Lawrence Berkeley Lab, Environm Energy Technol Div, Berkeley, CA 94720 USA
AN - 139 BT - Advanced Functional Materials C2 - LBNL-51429 DA - 05/2002 DO - 10.1002/1616-3028(20020517)12:5<323::AID-ADFM323>3.0.CO;2-G IS - 5 LA - eng LB - Laser N1 -LBNL-51429 NOT IN FILE
N2 -This article surveys recent developments in the rational synthesis of single-crystalline zinc oxide nanowires and their unique optical properties. The growth of ZnO nanowires was carried out in a simple chemical vapor transport and condensation (CVM system. Based on our fundamental understanding of the vapor-liquid-solid (VLS) nanowire growth mechanism, different levels of growth controls (including positional, orientational, diameter, and density control) have been achieved. Power-dependent emission has been examined and lasing action was observed in these ZnO nanowires when the excitation intensity exceeds a threshold (~40 kW cm-2). These short-wavelength nanolasers operate at room temperature and the areal density of these nanolasers on substrate readily reaches 1 X 1010 cm-2. The observation of lasing, fabricated mirrors indicates these single-crystalline, well-facetted nanoaction in these nanowire arrays without any wires can function as self-contained optical resonance cavities. This argument is further supported by our recent near-field scanning optical microscopy (NSOM) studies on single nanowires.
PY - 2002 SP - 323 EP - 331 ST - Adv. Funct. Mater. T2 - Advanced Functional Materials TI - Controlled growth of ZnO nanowires and their optical properties VL - 12 ER -