Abstract
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[Formula: see text][Formula: see text]m were obtained. The synthesized MWs showed a hexagonal cross-sectional morphology and the longest MW was found to be 1[Formula: see text]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 (D0X) and decomposition of the D0X into FX was observed beyond 140[Formula: see text]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.
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