In Situ Modification of Three-Dimensional Polyphenylene Dendrimer-Templated CuO Rice-Shaped Architectures with Electron Beam Irradiation

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• 作者：Xiaoying Qi ; Yizhong Huang ; Markus Klapper ; Freddy Boey ; Wei Huang ; Steven De Feyter ; Klaus Mllen ; Hua Zhang
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：August 19, 2010
• 年：2010
• 卷：114
• 期：32
• 页码：13465-13470
• 全文大小：406K
• 年卷期：v.114,no.32(August 19, 2010)
• ISSN：1932-7455

文摘

In this study, the high-energy electron beam of the transmission electron microscope (TEM) is utilized as an external force to in situ modify the polyphenylene dendrimer (G2Td(COOH)₁₆) templated CuO rice-shaped architecture (RSA). By virtue of the nanoscale precision of this approach, the electron beam-modified RSA retains its rice shape while the internal primary CuO nanoparticles are converted to the Cu₂O nanoparticles with increased size. Detailed investigation using a time-lapse TEM technique reveals that such a modification process is mainly constituted by two stages, involving the arrangement of the primary CuO nanoparticles and the transformation of the primary CuO into Cu₂O nanoparticles. Within the modification process, the high-energy electron beam of TEM serves as the external driving force and energy resource to improve the orientation and increase the crystallinity of the single-phase CuO nanoparticles and subsequently transfer the nanoparticle phase from CuO to Cu₂O. This study highlights a facile in situ way to finely tune the nanoscale morphology and chemical composition of nanoparticles and nanoparticle-based assembled structures.