Synthesis of Long-Leg Tetrapod ZnO Whiskers and Their Characterization by Electron Microscopy Methods
Abstract:The long-leg tetrapod ZnO whiskers were synthesized by two steps: pulsed laser deposition (PLD) and catalyst-free thermal evaporation method. Firstly, the ZnO films were pre-deposited on Si(111) substrates by PLD. Then the ZnO whiskers grew on ZnO-coated Si(111) substrate by the simple thermal evaporation of the metallic zinc powder at 850 °C without any catalyst or carrier gas. The pre-deposited ZnO films by PLD on the substrates can provide growing sites for the ZnO whiskers. The as-synthesized ZnO whiskers were characterized by using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM) and Fourier transform infrared spectrum (FTIR). The results show that the ZnO whiskers are highly crystalline with the wurtzite hexagonal structure. The assynthesized whiskers are high yield with the leg length of about 15–25 m. Photoluminescence (PL) spectrum of as-synthesized whiskers exhibits a strong UV emission peak at 384 nm and a weak green emission peak at 514 nm. In addition, the possible growth mechanism of ZnO whiskers are also discussed in detail.
Document Type: Research Article
Publication date: February 1, 2011
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- Journal of Advanced Microscopy Research (JAMR) provides a forum for rapid dissemination of important developments in high-resolution microscopy techniques to image, characterize and analyze man-made and natural samples; to study physicochemical phenomena such as abrasion, adhesion, corrosion and friction; to perform micro and nanofabrication, lithography, patterning, micro and nanomanipulation; theory and modeling, as well as their applications in all areas of science, engineering, and medicine.
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