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Excitation wavelength dependent fluorescence of graphene oxide controlled by strain

Cushing, Scott K. and Ding, Weiqiang and Chen, Gang and Wang, Chao and Yang, Feng and Huang, Fuqiang and Wu, Nianqiang (2017) Excitation wavelength dependent fluorescence of graphene oxide controlled by strain. Nanoscale, 9 (6). pp. 2240-2245. ISSN 2040-3364. doi:10.1039/C6NR08286F.

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Unlike conventional fluorophores, the fluorescence emission of graphene oxide (GO) sheets can shift hundreds of nanometers as the excitation wavelength increases. The excitation wavelength dependent fluorescence is referred to as a giant red-edge effect and originates in a local reorganization potential slowing down the solvation dynamics of the excited state to the same time scale as the fluorescence lifetime. The present work has discovered that out-of-plane strain in the graphene oxide sheet leads to the intra-layer interaction necessary to slow down the solvation time scale. The oxygen percentage, dopant percentage, disorder, and strain are correlated with the presence and extent of the red-edge effect in oxygen, boron, nitrogen, and fluorine doped graphene oxide. Of these commonly cited possibilities, only out-of-plane strain is directly correlated to the red-edge effect. Furthermore, it is shown that the extent of the red-edge effect, or how far the emission wavelength can shift with increasing excitation wavelength, can be tuned by the electronegativity of the dopant. The present work interprets why the giant red-edge effect is present in some GO sheets but not in other GO sheets.

Item Type:Article
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URLURL TypeDescription Information
Cushing, Scott K.0000-0003-3538-2259
Wu, Nianqiang0000-0002-8888-2444
Additional Information:© Royal Society of Chemistry 2017. Received 21st October 2016 , Accepted 6th January 2017. First published on 9th January 2017. This work was partially supported by a NSF grant (CBET-1336205). The use of WVU shared facility is acknowledged. G. C. acknowledges a partial support from the NSF under Grant DMR-1507670.
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Issue or Number:6
Record Number:CaltechAUTHORS:20180627-101958141
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87388
Deposited By: George Porter
Deposited On:27 Jun 2018 17:35
Last Modified:15 Nov 2021 20:47

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