Electronic structure of cyclodextrin–carbon nanotube composite films
| Autor: | Hien Thi Ngoc Le, Peter A. Dowben, Priyanka Chakraborti, Hae Kyung Jeong, Elena Echeverria |
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| Rok vydání: | 2017 |
| Předmět: |
Nanotube
Materials science General Chemical Engineering Fermi level Binding energy Composite number Nanotechnology 02 engineering and technology General Chemistry Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention symbols.namesake X-ray photoelectron spectroscopy Chemical engineering law Density of states symbols 0210 nano-technology Biosensor |
| Zdroj: | RSC Advances. 7:10968-10972 |
| ISSN: | 2046-2069 |
| DOI: | 10.1039/c6ra26900a |
| Popis: | The electronic structures of two kinds of cyclodextrin–carbon nanotube (αCD–CNT and γCD–CNT) composite films are investigated by using (angular dependent) photoelectron spectroscopy to gain insight as to why the αCD–CNT and γCD–CNT composite films show different performances in biosensor applications. The γCD–CNT composite film is likely to have the CD localized on the surface rather than in the bulk of the film, while αCD–CNT has CD relatively more concentrated within the bulk of selvedge region of the film, rather than the surface. The results indicate that the CD, of the γCD–CNT composite, may be more bioactive, and possibly a better sensor of biomolecules due to the favorable surface position compared with that of αCD–CNT. The valence band of αCD–CNT and γCD–CNT show little difference from the CNT film except for a density of states, originating from CD, evident at a binding energy near 27 eV below Fermi level, meaning that there are few or no redox interactions between the CD and the CNT. The absence of a redox interaction between the CD and the CNT permits a clear electrochemical response to occur when guest biomolecules are captured on the composites, providing a route to biosensor applications. |
| Databáze: | OpenAIRE |
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