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Low temperature synthesis of ZnO nanopowders by the polymerized complex method  

권용재 (한양대학교 나노공학과 CPRC)
김경훈 (한양대학교 세라믹공학과 CPRC)
임창성 (한서대학교 재료공학과 CPRC)
심광보 (한양대학교 나노공학과 CPRC)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.12, no.5, 2002 , pp. 229-233 More about this Journal
Abstract
Nano-sized ZnO particles were successfully synthesized at low temperatures by a polymerized complex method via an organochemical route. The polymeric precursors could be prepared using Zn nitrate hexahydrate and a mixed solution of citric acid and ethylene glycol as a chelating agent and a reaction medium. The polymeric precursors were calcined at temperatures from 300 to $700^{\circ}C$ for 3 h, and evaluated for degree of crystallization process, thermal decomposition, surface morphology and crystallite size. The thermal decomposition and crystallization process were analyzed by TG-DTA, FI-IR and XRD. The morphology and crystallite size of the calcined particles were evaluated by scanning electron microscopy (SEM), transmittance electron microscopy (TEM) and Scherrer's equation. Crystallization of the ZnO particles was detected at $300^{\circ}C$ and entirely completed above $400^{\circ}C$. Particles calcined between 400 and $700^{\circ}C$ showed a uniform size distribution with a round shape. The average particle sizes calcined at $400^{\circ}C$ for 3 hour were 30~40nm showing an ordinary tendency to increase with the temperatures.
Keywords
ZnO; Polymerized complex method; Nanopowder; Crystallization; Crystalline size;
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