Organized and highly dispersed growth of MnO2 nano-rods by sonochemical hydrolysis of Mn3acetate |
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Authors: | Kumar V Ganesh Kim Kwang Bum |
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Affiliation: | Division of Material Science and Engineering, Yonsei University, Seodaemoon-gu, Seoul, Republic of Korea. |
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Abstract: | Highly dispersed and non-agglomerated alpha-MnO(2) nano-needles of dimensions 20-30 nm have been synthesized by the application of ultrasound radiation on the aqueous solution consisting of manganese(3)acetate close to neutral pH followed by mild drying. With a similar reaction system, hot hydrolysis (non-sonochemical process) produced beta-MnO(2) nano-rods of length 100-200 nm but with high degree agglomeration. Sonochemical cavitation phenomenon is suggested to have a pronounced effect for the formation of special phase and morphology. The effect is proved by the difference in the intermediate products which has difference in crystalinity and phase-purity. The intermediate phases are identified to be single-phase gamma-MnOOH for the non-sonochemical reaction and mixture of gamma-MnOOH, alpha-MnO(2) and beta-MnO(2) for the sonochemical products. |
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Keywords: | Nano-rods Nano-needles α -MnO2 |
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