Field emission enhancement of PbS colloidal quantum dot-decorated single-walled carbon nanotubes
- Title
- Field emission enhancement of PbS colloidal quantum dot-decorated single-walled carbon nanotubes
- Author
- 이휘건
- Keywords
- Single-walled carbon nanotubes; Quantum dots; Ligand-exchange; Field emission; Charge transfer
- Issue Date
- 2019-11
- Publisher
- ELSEVIER SCIENCE SA
- Citation
- JOURNAL OF ALLOYS AND COMPOUNDS, v. 809, article no. UNSP 151832
- Abstract
- Herein, a simple and effective PbS colloidal quantum dot (CQD) decoration method for single-walled carbon nanotube (SWNT) is demonstrated. By dipping the SWNT film into a CQD dispersion followed by a solid-state ligand exchange, CQDs were successfully decorated onto the wall of SWNT without compromising a narrow size distribution. Spectroscopic studies suggested that (1) the CQD decoration and subsequent ligand exchange process did not alter the chemical nature of the SWNT framework and (2) there was a charge (electron) transfer process from the PbS CQD to the SWNT. Field emission (FE) characteristics of the CQD-decorated SWNT films revealed that FE enhancement was indeed established from SWNTs with a moderate degree of CQD decoration, while those with excessive decoration (coating) exhibited notable FE suppression. Horizontal current-voltage measurements with perpendicular-directional external electric field modulation suggested that electron supplement of SWNT from PbS CQD was pronounced as the amount of decorated CQDs increased. Based on the experimental results, we proposed a new mechanism demonstrating FE enhancement of a CQD/SWNT heterostructure. (C) 2019 Elsevier B.V. All rights reserved.
- URI
- https://www.sciencedirect.com/science/article/pii/S0925838819330658?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/152670
- ISSN
- 0925-8388; 1873-4669
- DOI
- 10.1016/j.jallcom.2019.151832
- Appears in Collections:
- COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > CHEMISTRY(화학과) > Articles
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