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Wang L, Han J, Sundahl B, Thornton S, Zhu Y, Zhou R, Jaye C, Liu H, Li ZQ, Taylor GT, Fischer DA, Appenzeller J, Harrison RJ, Wong SS. Ligand-induced dependence of charge transfer in nanotube-quantum dot heterostructures. NANOSCALE 2016; 8:15553-15570. [PMID: 27368081 DOI: 10.1039/c6nr03091b] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
As a model system to probe ligand-dependent charge transfer in complex composite heterostructures, we fabricated double-walled carbon nanotube (DWNT)-CdSe quantum dot (QD) composites. Whereas the average diameter of the QDs probed was kept fixed at ∼4.1 nm and the nanotubes analyzed were similarly oxidatively processed, by contrast, the ligands used to mediate the covalent attachment between the QDs and DWNTs were systematically varied to include p-phenylenediamine (PPD), 2-aminoethanethiol (AET), and 4-aminothiophenol (ATP). Herein, we have put forth a unique compilation of complementary data from experiment and theory, including results from transmission electron microscopy (TEM), near-edge X-ray absorption fine structure (NEXAFS) spectroscopy, Raman spectroscopy, electrical transport measurements, and theoretical modeling studies, in order to fundamentally assess the nature of the charge transfer between CdSe QDs and DWNTs, as a function of the structure of various, intervening bridging ligand molecules. Specifically, we correlated evidence of charge transfer as manifested by changes and shifts associated with NEXAFS intensities, Raman peak positions, and threshold voltages both before and after CdSe QD deposition onto the underlying DWNT surface. Importantly, for the first time ever in these types of nanoscale composite systems, we have sought to use theoretical modeling to justify and account for our experimental results. Our overall data suggest that (i) QD coverage density on the DWNTs varies, based upon the different ligand pendant groups used and that (ii) the presence of a π-conjugated carbon framework within the ligands themselves coupled with the electron affinity of their pendant groups collectively play important roles in the resulting charge transfer from QDs to the underlying CNTs.
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Affiliation(s)
- Lei Wang
- Department of Chemistry, State University of New York at Stony Brook, Stony Brook, NY 11794-3400, USA.
| | - Jinkyu Han
- Condensed Matter Physics and Materials Sciences Division, Brookhaven National Laboratory, Building 480, Upton, NY 11973, USA
| | - Bryan Sundahl
- Institute of Advanced Computational Science, State University of New York at Stony Brook, Stony Brook, NY 11794, USA
| | - Scott Thornton
- Institute of Advanced Computational Science, State University of New York at Stony Brook, Stony Brook, NY 11794, USA
| | - Yuqi Zhu
- Department of Electrical and Computer Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA
| | - Ruiping Zhou
- Department of Electrical and Computer Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA
| | - Cherno Jaye
- Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20889, USA
| | - Haiqing Liu
- Department of Chemistry, State University of New York at Stony Brook, Stony Brook, NY 11794-3400, USA.
| | - Zhuo-Qun Li
- School of Marine and Atmospheric Sciences, State University of New York at Stony Brook, Stony Brook, NY 11794-5000, USA
| | - Gordon T Taylor
- School of Marine and Atmospheric Sciences, State University of New York at Stony Brook, Stony Brook, NY 11794-5000, USA
| | - Daniel A Fischer
- Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20889, USA
| | - Joerg Appenzeller
- Department of Electrical and Computer Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907, USA
| | - Robert J Harrison
- Institute of Advanced Computational Science, State University of New York at Stony Brook, Stony Brook, NY 11794, USA and Computational Science Center, Brookhaven National Laboratory, Upton, NY 11973, USA
| | - Stanislaus S Wong
- Department of Chemistry, State University of New York at Stony Brook, Stony Brook, NY 11794-3400, USA. and Condensed Matter Physics and Materials Sciences Division, Brookhaven National Laboratory, Building 480, Upton, NY 11973, USA
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van Bokhoven JA, Sambe H, Ramaker DE, Koningsberger DC. Al K-Edge Near-Edge X-ray Absorption Fine Structure (NEXAFS) Study on the Coordination Structure of Aluminum in Minerals and Y Zeolites. J Phys Chem B 1999. [DOI: 10.1021/jp990478t] [Citation(s) in RCA: 65] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- J. A. van Bokhoven
- Chemistry Department, George Washington University, Washington, D.C. 20052 and Laboratory of Inorganic Chemistry and Catalysis, Debye Institute, Utrecht University, 3508 TB Utrecht, The Netherlands
| | - H. Sambe
- Chemistry Department, George Washington University, Washington, D.C. 20052 and Laboratory of Inorganic Chemistry and Catalysis, Debye Institute, Utrecht University, 3508 TB Utrecht, The Netherlands
| | - D. E. Ramaker
- Chemistry Department, George Washington University, Washington, D.C. 20052 and Laboratory of Inorganic Chemistry and Catalysis, Debye Institute, Utrecht University, 3508 TB Utrecht, The Netherlands
| | - D. C. Koningsberger
- Chemistry Department, George Washington University, Washington, D.C. 20052 and Laboratory of Inorganic Chemistry and Catalysis, Debye Institute, Utrecht University, 3508 TB Utrecht, The Netherlands
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Qian X, Sambe H, Ramaker DE, Pandya KI, O'Grady WE. Quantitative Interpretation of K-Edge NEXAFS Data for Various Nickel Hydroxides and the Charged Nickel Electrode. J Phys Chem B 1997. [DOI: 10.1021/jp970435h] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- X. Qian
- Chemistry Department, George Washington University, Washington, DC 20052, Surface Chemistry Branch, Code 6170, Naval Research Laboratory, Washington, DC 20375, and Physics Department, North Carolina State University, Raleigh, North Carolina 27695
| | - H. Sambe
- Chemistry Department, George Washington University, Washington, DC 20052, Surface Chemistry Branch, Code 6170, Naval Research Laboratory, Washington, DC 20375, and Physics Department, North Carolina State University, Raleigh, North Carolina 27695
| | - D. E. Ramaker
- Chemistry Department, George Washington University, Washington, DC 20052, Surface Chemistry Branch, Code 6170, Naval Research Laboratory, Washington, DC 20375, and Physics Department, North Carolina State University, Raleigh, North Carolina 27695
| | - K. I. Pandya
- Chemistry Department, George Washington University, Washington, DC 20052, Surface Chemistry Branch, Code 6170, Naval Research Laboratory, Washington, DC 20375, and Physics Department, North Carolina State University, Raleigh, North Carolina 27695
| | - W. E. O'Grady
- Chemistry Department, George Washington University, Washington, DC 20052, Surface Chemistry Branch, Code 6170, Naval Research Laboratory, Washington, DC 20375, and Physics Department, North Carolina State University, Raleigh, North Carolina 27695
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