Journal
SMALL
Volume 14, Issue 31, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201801093
Keywords
CeO2 nanocrystals; EELS mapping; organic surfactant; STEM imaging; surface chemistry
Categories
Funding
- China Scholarship Council
- Japan Society for the Promotion of Science (JSPS) KAKENHI [JP16H04559, JP17H06467]
- JSPS KAKENHI [JP16H06367, JP17K19005, JP25249108, JP2663039]
- SIP (Cross-Ministerial Strategic Innovation Promotion Program)
- New Energy and Industrial Technology Development Organization (NEDO) [P08022]
- Japan Science and Technology Agency (JST), Core Research for Evolutionary Science and Technology (CREST), Japan [JP16010800802]
- World Premier International Research Center Initiative (WPI) from Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- JSPS [17H06094]
- Nanotechnology Platform from the MEXT, Japan [12024046]
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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.
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