Silica xerogel films hybridized with carbon nanotubes by single step sol–gel processing
| Autor: | In Keun Jung, Seungsu Baek, Jyoti L. Gurav, Uzma K.H. Bangi, Hyung Ho Park |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
Scanning electron microscope Doping Carbon nanotube Nanoindentation Condensed Matter Physics Dip-coating Electronic Optical and Magnetic Materials law.invention X-ray photoelectron spectroscopy law Materials Chemistry Ceramics and Composites Surface modification Composite material Sol-gel |
| Zdroj: | Journal of Non-Crystalline Solids. 358:550-556 |
| ISSN: | 0022-3093 |
| DOI: | 10.1016/j.jnoncrysol.2011.11.009 |
| Popis: | Synthesis of multi-walled carbon nanotubes (MWCNTs) doped silica xerogel films was reported in this work. A crucial step of introducing MWCNTs was achieved by functionalizing them by acid treatment to form stable and homogenous SiO2/MWCNTs sol. Scanning electron microscopy showed spherical particles in honeycomb network structure for undoped xerogel films whereas dispersion and wrapping of MWCNTs in silica matrix was observed for MWCNTs doped films. Various bond formations during the sol–gel process and surface modification were confirmed using Fourier transform infra-red and detailed study on the chemical bonding state of the films was carried out using X-ray photoelectron spectroscopy. Nanoindentation studies showed that the mechanical properties of MWCNTs doped xerogel film increase dramatically: higher modulus (E = 2.127 ± 0.095 GPa) and hardness (H = 0.035 ± 0.017 GPa) values than those of pristine xerogel film (E = 0.234 ± 0.058 GPa, H = 0.01 ± 0.003 GPa). |
| Databáze: | OpenAIRE |
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