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EELS Observation on Spontaneously Grown Ag@Titanium Oxide Core Shell Nanowires

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Meeting: The 16th European Microscopy Congress 2016

Session: Materials Science

Topic: 1D and 2D materials

Presentation Form: Poster

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1. Department of Materials Science and Engineering, National Chung Hsing University, Taichung, Taïwan 2. Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei, Taïwan 3. Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei, Taïwan 4. Laboratoire de Physique des Solids, Université Paris Sud 11, CNRS UMR 8502, Orsay, France

Keywords: core-shell nanowires, Electron energy loss spectroscopy (EELS), Valence state

To enhance functionality and usability of 1-D nanomaterials, the synthesis of composite nanowires such as core-shell nanowires is a good solution.  Ag-TiO2 core-shell nanowires have attracted much attraction, because Ag nanowires have unique properties of high surface plasmon resonance as well as good electrical conductivity, while TiO2 is an ideal material as photocatalysts.  In the absence of oxide precursors, templates, inoculants and surfactants, this study successfully prepared vertical Ag nanowires with a spontaneous ultra-thin TiO2 shell (~0.5 nm) on TiO2 substrate using a one step process.  STEM/EELS results demonstrate that this oxygen-deficient TiO2 layer is formed through the oxidation of Ti which is released from the substrate and segregated to the nanowire surface simultaneously with crystal growth of the nanowires (Fig. 1).  The EELS spectra suggest that the valence of Ti ions in this spontaneous oxide layer is between Ti3+ and Ti4+.

Figures:

Fig. 1 Ag@TiO2-x core-shell nanowires and the corresponding EELS elemental mapping at wire edge, as well as the schematic growth mechanism

To cite this abstract:

Jenn-Ming Song, Chi-Hang Tsai, Shih-Yun Chen, Alexandre Gloter; EELS Observation on Spontaneously Grown Ag@Titanium Oxide Core Shell Nanowires. The 16th European Microscopy Congress, Lyon, France. https://emc-proceedings.com/abstract/eels-observation-on-spontaneously-grown-agtitanium-oxide-core-shell-nanowires/. Accessed: December 4, 2023

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