Direct observation of spatially heterogeneous single-layer graphene oxide reduction kinetics
Graphene oxide (GO) is an important precursor in the production of chemically derived graphene. During reduction, GO's electrical conductivity and band gap change gradually. Doping and chemical functionalization are also possible, illustrating GO's immense potential in creating functional...
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todo:paper_15306984_v13_n12_p5777_McDonald2023-10-03T16:21:18Z Direct observation of spatially heterogeneous single-layer graphene oxide reduction kinetics McDonald, M.P. Eltom, A. Vietmeyer, F. Thapa, J. Morozov, Y.V. Sokolov, D.A. Hodak, J.H. Vinodgopal, K. Kamat, P.V. Kuno, M. fluorescence intermittency Graphene oxide photobrightening photolysis reduced graphene oxide reduction Chemically derived graphene Fluorescence intermittency Graphene oxides Photobrightening Photoluminescence efficiency Reduced graphene oxides Reduced graphene oxides (RGO) Spatial and temporal heterogeneity Kinetics Photoluminescence Photolysis Reduction Graphene graphite organic compound oxide article chemistry electric conductivity kinetics photolysis Electric Conductivity Graphite Kinetics Organic Chemicals Oxides Photolysis Graphene oxide (GO) is an important precursor in the production of chemically derived graphene. During reduction, GO's electrical conductivity and band gap change gradually. Doping and chemical functionalization are also possible, illustrating GO's immense potential in creating functional devices through control of its local hybridization. Here we show that laser-induced photolysis controllably reduces individual single-layer GO sheets. The reaction can be followed in real time through sizable decreases in GO's photoluminescence efficiency along with spectral blueshifts. As-produced reduced graphene oxide (rGO) sheets undergo additional photolysis, characterized by dramatic emission enhancements and spectral redshifts. Both GO's reduction and subsequent conversion to photobrightened rGO are captured through movies of their photoluminescence kinetics. Rate maps illustrate sizable spatial and temporal heterogeneities in sp2 domain growth and reveal how reduction "flows" across GO and rGO sheets. The observed heterogeneous reduction kinetics provides mechanistic insight into GO's conversion to chemically derived graphene and highlights opportunities for overcoming its dynamic, chemical disorder. © 2013 American Chemical Society. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_15306984_v13_n12_p5777_McDonald |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
fluorescence intermittency Graphene oxide photobrightening photolysis reduced graphene oxide reduction Chemically derived graphene Fluorescence intermittency Graphene oxides Photobrightening Photoluminescence efficiency Reduced graphene oxides Reduced graphene oxides (RGO) Spatial and temporal heterogeneity Kinetics Photoluminescence Photolysis Reduction Graphene graphite organic compound oxide article chemistry electric conductivity kinetics photolysis Electric Conductivity Graphite Kinetics Organic Chemicals Oxides Photolysis |
| spellingShingle |
fluorescence intermittency Graphene oxide photobrightening photolysis reduced graphene oxide reduction Chemically derived graphene Fluorescence intermittency Graphene oxides Photobrightening Photoluminescence efficiency Reduced graphene oxides Reduced graphene oxides (RGO) Spatial and temporal heterogeneity Kinetics Photoluminescence Photolysis Reduction Graphene graphite organic compound oxide article chemistry electric conductivity kinetics photolysis Electric Conductivity Graphite Kinetics Organic Chemicals Oxides Photolysis McDonald, M.P. Eltom, A. Vietmeyer, F. Thapa, J. Morozov, Y.V. Sokolov, D.A. Hodak, J.H. Vinodgopal, K. Kamat, P.V. Kuno, M. Direct observation of spatially heterogeneous single-layer graphene oxide reduction kinetics |
| topic_facet |
fluorescence intermittency Graphene oxide photobrightening photolysis reduced graphene oxide reduction Chemically derived graphene Fluorescence intermittency Graphene oxides Photobrightening Photoluminescence efficiency Reduced graphene oxides Reduced graphene oxides (RGO) Spatial and temporal heterogeneity Kinetics Photoluminescence Photolysis Reduction Graphene graphite organic compound oxide article chemistry electric conductivity kinetics photolysis Electric Conductivity Graphite Kinetics Organic Chemicals Oxides Photolysis |
| description |
Graphene oxide (GO) is an important precursor in the production of chemically derived graphene. During reduction, GO's electrical conductivity and band gap change gradually. Doping and chemical functionalization are also possible, illustrating GO's immense potential in creating functional devices through control of its local hybridization. Here we show that laser-induced photolysis controllably reduces individual single-layer GO sheets. The reaction can be followed in real time through sizable decreases in GO's photoluminescence efficiency along with spectral blueshifts. As-produced reduced graphene oxide (rGO) sheets undergo additional photolysis, characterized by dramatic emission enhancements and spectral redshifts. Both GO's reduction and subsequent conversion to photobrightened rGO are captured through movies of their photoluminescence kinetics. Rate maps illustrate sizable spatial and temporal heterogeneities in sp2 domain growth and reveal how reduction "flows" across GO and rGO sheets. The observed heterogeneous reduction kinetics provides mechanistic insight into GO's conversion to chemically derived graphene and highlights opportunities for overcoming its dynamic, chemical disorder. © 2013 American Chemical Society. |
| format |
JOUR |
| author |
McDonald, M.P. Eltom, A. Vietmeyer, F. Thapa, J. Morozov, Y.V. Sokolov, D.A. Hodak, J.H. Vinodgopal, K. Kamat, P.V. Kuno, M. |
| author_facet |
McDonald, M.P. Eltom, A. Vietmeyer, F. Thapa, J. Morozov, Y.V. Sokolov, D.A. Hodak, J.H. Vinodgopal, K. Kamat, P.V. Kuno, M. |
| author_sort |
McDonald, M.P. |
| title |
Direct observation of spatially heterogeneous single-layer graphene oxide reduction kinetics |
| title_short |
Direct observation of spatially heterogeneous single-layer graphene oxide reduction kinetics |
| title_full |
Direct observation of spatially heterogeneous single-layer graphene oxide reduction kinetics |
| title_fullStr |
Direct observation of spatially heterogeneous single-layer graphene oxide reduction kinetics |
| title_full_unstemmed |
Direct observation of spatially heterogeneous single-layer graphene oxide reduction kinetics |
| title_sort |
direct observation of spatially heterogeneous single-layer graphene oxide reduction kinetics |
| url |
http://hdl.handle.net/20.500.12110/paper_15306984_v13_n12_p5777_McDonald |
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1807321498414743552 |