Study of ultrafine grains formed on the microsized catalyst surface induced growth of aligned SiO2 nanowires
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In this study, beard-like and sea cucumber-like silica structures have been successfully synthesized on the Si substrate by a novel and simple water assisted method. The investigation of SEM and TEM reveals that the as-grown products possess many similar features like that they all have a very big, nearly spherical microsized body and uncountable, high density and highly oriented silica nanowire antennas. It is proved that ultrafine nanosized metal catalysts could be generated on the surface of one microsized catalyst during their growth process due to the indications of surface local softening and different elastic deformation along different crystal plane taking place on the catalyst surface during growth process. Our results could introduce a new way to control the growth of high-density and well-oriented functional nanowire arrays with desired morphologies.
KeywordsWhisker Growth Nanowire Diameter Catalyst Droplet Silica Nanowires Large Catalyst
The work was supported by 973 program (Grant No. 2012CB326407), Zhejiang Provincial Science Foundation for Distinguished Young Scholars (Grant No. R4100242) and Zhejiang Provincial Science Foundation (Grant No. Y4110529), National Natural Science Foundation of China (NSFC, Grant Nos. 50872058, 51202115, and 50572083), Ningbo Municipal Natural Science Foundation (Grant Nos. 2011A610093 and 2011A610094), and the support of K.C. Wong Education Foundation.
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