Exciton Coherence Length and Dynamics in Graphene Quantum Dot Assemblies
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2020
Authors
Singh, VarunZorić, Marija R.
Hargenrader, George N.
Valentine, Andrew J. S.
Zivojinović, Olivera
Milić, Dragana
Li, Xiaosong
Glušac, Ksenija D.
Article (Published version)
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Exciton size and dynamics were studied in assemblies of two well-defined graphene quantum dots of varying size: hexabenzocoronene (HBC), where the aromatic core consists of 42 C atoms, and carbon quantum dot (CQD) with 78 C atoms. The synthesis of HBC and CQD were achieved using bottom-up chemical methods, while their assembly was studied using steady-state UV/vis spectroscopy, X-ray scattering, and electron microscopy. While HBC forms long ordered fibers, CQD was found not to assemble well. The exciton size and dynamics were studied using time-resolved laser spectroscopy. At early times (∼100 fs), the exciton was found to delocalize over ∼1-2 molecular units in both assemblies, which reflects the confined nature of excitons in carbon-based materials and is consistent with the calculated value of ∼2 molecular units. Exciton-exciton annihilation measurements provided the exciton diffusion lengths of 16 and 3 nm for HBC and CQD, respectively.
Source:
The journal of physical chemistry letters, 2020, 11, 1, 210-216Publisher:
- NLM (Medline)
Note:
- Supplementary material: http://cherry.chem.bg.ac.rs/handle/123456789/3811
DOI: 10.1021/acs.jpclett.9b03384
ISSN: 1948-7185
WoS: 000506088000033
Scopus: 2-s2.0-85077402312
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Hemijski fakultet / Faculty of ChemistryTY - JOUR AU - Singh, Varun AU - Zorić, Marija R. AU - Hargenrader, George N. AU - Valentine, Andrew J. S. AU - Zivojinović, Olivera AU - Milić, Dragana AU - Li, Xiaosong AU - Glušac, Ksenija D. PY - 2020 UR - https://cherry.chem.bg.ac.rs/handle/123456789/3810 AB - Exciton size and dynamics were studied in assemblies of two well-defined graphene quantum dots of varying size: hexabenzocoronene (HBC), where the aromatic core consists of 42 C atoms, and carbon quantum dot (CQD) with 78 C atoms. The synthesis of HBC and CQD were achieved using bottom-up chemical methods, while their assembly was studied using steady-state UV/vis spectroscopy, X-ray scattering, and electron microscopy. While HBC forms long ordered fibers, CQD was found not to assemble well. The exciton size and dynamics were studied using time-resolved laser spectroscopy. At early times (∼100 fs), the exciton was found to delocalize over ∼1-2 molecular units in both assemblies, which reflects the confined nature of excitons in carbon-based materials and is consistent with the calculated value of ∼2 molecular units. Exciton-exciton annihilation measurements provided the exciton diffusion lengths of 16 and 3 nm for HBC and CQD, respectively. PB - NLM (Medline) T2 - The journal of physical chemistry letters T1 - Exciton Coherence Length and Dynamics in Graphene Quantum Dot Assemblies VL - 11 IS - 1 SP - 210 EP - 216 DO - 10.1021/acs.jpclett.9b03384 ER -
@article{ author = "Singh, Varun and Zorić, Marija R. and Hargenrader, George N. and Valentine, Andrew J. S. and Zivojinović, Olivera and Milić, Dragana and Li, Xiaosong and Glušac, Ksenija D.", year = "2020", abstract = "Exciton size and dynamics were studied in assemblies of two well-defined graphene quantum dots of varying size: hexabenzocoronene (HBC), where the aromatic core consists of 42 C atoms, and carbon quantum dot (CQD) with 78 C atoms. The synthesis of HBC and CQD were achieved using bottom-up chemical methods, while their assembly was studied using steady-state UV/vis spectroscopy, X-ray scattering, and electron microscopy. While HBC forms long ordered fibers, CQD was found not to assemble well. The exciton size and dynamics were studied using time-resolved laser spectroscopy. At early times (∼100 fs), the exciton was found to delocalize over ∼1-2 molecular units in both assemblies, which reflects the confined nature of excitons in carbon-based materials and is consistent with the calculated value of ∼2 molecular units. Exciton-exciton annihilation measurements provided the exciton diffusion lengths of 16 and 3 nm for HBC and CQD, respectively.", publisher = "NLM (Medline)", journal = "The journal of physical chemistry letters", title = "Exciton Coherence Length and Dynamics in Graphene Quantum Dot Assemblies", volume = "11", number = "1", pages = "210-216", doi = "10.1021/acs.jpclett.9b03384" }
Singh, V., Zorić, M. R., Hargenrader, G. N., Valentine, A. J. S., Zivojinović, O., Milić, D., Li, X.,& Glušac, K. D.. (2020). Exciton Coherence Length and Dynamics in Graphene Quantum Dot Assemblies. in The journal of physical chemistry letters NLM (Medline)., 11(1), 210-216. https://doi.org/10.1021/acs.jpclett.9b03384
Singh V, Zorić MR, Hargenrader GN, Valentine AJS, Zivojinović O, Milić D, Li X, Glušac KD. Exciton Coherence Length and Dynamics in Graphene Quantum Dot Assemblies. in The journal of physical chemistry letters. 2020;11(1):210-216. doi:10.1021/acs.jpclett.9b03384 .
Singh, Varun, Zorić, Marija R., Hargenrader, George N., Valentine, Andrew J. S., Zivojinović, Olivera, Milić, Dragana, Li, Xiaosong, Glušac, Ksenija D., "Exciton Coherence Length and Dynamics in Graphene Quantum Dot Assemblies" in The journal of physical chemistry letters, 11, no. 1 (2020):210-216, https://doi.org/10.1021/acs.jpclett.9b03384 . .