Fabrication, Structural Characterization and Optical Properties of Oversized ZnO Microwires

作者：Yan, S. S.; Zhang, H.; Azad, Fahad; Su, S. C.^*

来源：Nano, 2017, 12(7): 1750081.

DOI：10.1142/S1793292017500813

• ZnO
• microwire
• lasing

In this paper, large-sized ZnO microwires (MWs) were successfully synthesized without using any catalyst, following a simple chemical vapor deposition (CVD) method. Highly crystalline ZnO MWs of several hundred micrometers length having diameter in the range of 10-40 mu m were obtained. The synthesized MWs showed a hexagonal cross-sectional morphology and the longest MW was found to be 1 mm long. The structural and optical properties of an individual large sized ZnO MWs were studied. Temperature-dependent photoluminescence (PL) spectra showed emissions for free excitons (FX) and donor-bound excitons ((DX)-X-0) and decomposition of the (DX)-X-0 into FX was observed beyond 140 K. The whispering gallery mode (WGM) lasing in an individual ZnO MW was achieved and also confirmed by two-dimensional finite difference time domain (2D-FDTD) method. These oversized ZnO MWs may find potential applications as WGM resonant cavities and optical waveguides.

• 出版日期2017-7
• 单位华南师范大学