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Trioctylphosphine-assisted morphology control of ZnO nanoparticles

Authors
Hong, Yun-KunCho, GeonHeePark, YoonSuOh, Soong JuHa, Don-Hyung
Issue Date
1-6월-2018
Publisher
IOP PUBLISHING LTD
Keywords
zinc oxide nanoparticles; oleylamine; trioctylphosphine; morphology control; tadpole-like shape
Citation
NANOTECHNOLOGY, v.29, no.22
Indexed
SCIE
SCOPUS
Journal Title
NANOTECHNOLOGY
Volume
29
Number
22
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/74969
DOI
10.1088/1361-6528/aab4c6
ISSN
0957-4484
Abstract
This study investigates the morphological change in colloidal ZnO nanoparticles (NPs) synthesized with trioctylphosphine (TOP). The addition of TOP to the synthesis causes an evolution in the shape of ZnO NPs to tadpole-like particles from quasi-spherical particles at 300 degrees C. The total length of the tadpole-like ZnO NPs can be modified by controlling the molar ratio of TOP to oleylamine (OLAM). The tadpole-like particles are elongated as the concentration of TOP increased but decreased when the addition of TOP is excessive. These tadpole-like ZnO NPs transform to quasi-spherical NPs regardless of the amount of TOP at a reaction time of 3 h at 300 degrees C. At 200 degrees C, the effect of TOP on the ZnO NP synthesis differs from that at 300 degrees C. The ZnO NPs synthesized by controlling the molar ratios of surfactant ligands (TOP:OLAM = 2:100 and 70: 100) at 200 degrees C share similar amorphous structures, while a crystalline ZnO phase is formed when the reaction time is 3 h. X-ray photoelectron spectroscopy analysis shows that TOP influences the oxidation of ZnO and suggests that a combination of OLAM and TOP plays a role in controlling the shape of ZnO NPs. These results provide critical insights to the utilization of TOP for a shape controlling ligand in ZnO NPs and suggest a new route to design oxide NPs.
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공과대학 (신소재공학부)
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