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

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number1801093
JournalSmall
Volume14
Issue number31
DOIs
Publication statusPublished - 2018 Aug 2

Keywords

  • CeO nanocrystals
  • EELS mapping
  • STEM imaging
  • organic surfactant
  • surface chemistry

ASJC Scopus subject areas

  • Biotechnology
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)

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