Direct Imaging for Single Molecular Chain of Surfactant on CeO2 Nanocrystals

Xiaodong Hao, Chunlin Chen, Mitsuhiro Saito, Deqiang Yin, Kazutoshi Inoue, Seiichi Takami, Tadafumi Adschiri, Yuichi Ikuhara

研究成果: ジャーナルへの寄稿学術論文査読

23 被引用数 (Scopus)

抄録

Organic surfactant controls the synthesis of nanocrystals (NCs) with uniform size and morphology by attaching on the surface of NCs and further facilitates their assembly into ordered superstructure, which produces versatile functional nanomaterials for practical applications. It is essential to directly resolve the surfactant molecules on the surface of NCs to improve the understanding of surface chemistry of NCs. However, the imaging resolution and contrast are insufficient for a single molecule of organic surfactant on NCs. In this work, direct characterization of organic surfactant on CeO2 NCs is conducted by using the state-of-the-art aberration corrected scanning transmission electron microscopy (STEM) imaging and electron energy loss spectra (EELS) techniques. The explicit evidence for the existence and distribution of organic surfactant on CeO2 NCs are obtained on the atomic scale by EELS elemental mapping. Besides, STEM imaging parameters are systematically adjusted and optimized for the direct imaging of a single molecular chain of organic surfactant on CeO2 NCs. Such direct visualization of organic surfactant molecule on the surface of NCs can be a significant step forward in the fields of nanomaterials surface chemistry and materials characterization.

本文言語英語
論文番号1801093
ジャーナルSmall
14
31
DOI
出版ステータス出版済み - 2018 8月 2

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