Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 111, Issue 24, Pages 8489-8495Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp071846t
Keywords
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Funding
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0830074] Funding Source: National Science Foundation
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In this work, we synthesized ZnO nanorods by a wet chemical process. By varying different parameters of the synthesis process like precursor concentration, solvent used, surfactant, temperature, and reaction time, we were able to control the aspect ratio (l/d) and sharpness factor (S-f = h/b) of the rods. Rods with an aspect ratio of similar to 20 and a sharpness factor of 10 were repeatedly obtained and characterized from scanning electron microscopy. High-resolution transmission electron microscopy and dark field analysis revealed that nanorods grow as a single crystal along the c axis [0001]. UV and visible emission was obtained in both flat- and sharp-terminated rods. According to the XPS analysis, rods present an excess of Zn2+ of similar to 4% that is responsible for the strong yellow emission band. Such defects were removed by annealing of the sample at 200 degrees C for 2 h. Possible mechanisms of changes in the morphology produced by changes in the synthesis process are also discussed.
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