Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 857, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.157598
Keywords
Carbon nanotubes; TiO2; Field emission; ALD; Vacancy; Conductivity
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Funding
- Ministry of Science and Technology (MOST), Taiwan [109-2634-F-009-029, 105-2221-E-007-049-MY3, 107-2218-E-009-024-MY3]
- Center for the Semiconductor Technology Research from The Featured Areas Research Center Program by the Ministry of Education (MOE) in Taiwan
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The study investigated the correlation between field emission characteristics of TiO2@CNTs nanocomposite and TiO2 crystallinity by charge transfer mechanism. Results showed that CNTs covered with amorphous TiO2 exhibited the best field emission properties due to more efficient charge transfer caused by oxygen vacancies in amorphous TiO2.
In this work, the correlation between field emission characteristics of TiO2@CNTs nanocomposite and TiO2 crystallinity was investigated via charge transfer mechanism. It was discovered that CNTs covered with amorphous TiO2 showed the lowest turn-on voltage and highest enhancement factor followed by CNTs combined with crystalline TiO2 and then pristine CNTs, consequently. The increased performance was attributed to the existence of oxygen vacancies in amorphous TiO2 which due to their donor-like nature resulted in more efficient charge transfer between TiO2 and CNTs. Thus, the surface of nanocomposite became occupied by a higher number of electrons which influenced positively on the application as field emission cathode. (C) 2020 Elsevier B.V. All rights reserved.
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