Electron transfer between methyl viologen radicals and graphene oxide

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Methyl viologen radicals are capable of transferring electrons to graphene oxide and partially restore the sp2 network. The reduced graphene oxide serves as a scaffold to anchor Ag nanoparticles. The growth of these silver nanoparticles is dictated by the ability of RGO to store and shuttle electrons. The RGO/Ag nanocomposites discussed in the present work offer new opportunities to design next generation photocatalysts. Visit our website, KamatLab.com, for the latest news, publications, and research from our group.

Education Technology

Electron transfer between methyl viologen radicals and graphene oxide: Reduction, electron storage and discharge Sachidananda Krishnamurthy, Ian V. Lightcap and Prashant V. Kamat. Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556, United States Presented by: Sachi Krishnamurthy

Graphene as a material. C.N.R. Rao, A.K. Sood, R. Voggu and K.S. Subrahmanyam, Some Novel Attributes of Graphene. The Journal of Physical Chemistry Letters 2010,1, 572-580. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Proto type Material

Graphene Oxide(GO)- Modified Hummer’s method. ,[object Object],[object Object],[object Object]

Reduction of Graphene Oxide GO Reduction RGO v v v

Methyl Viologen as a light absorber. ε 605 =13800 M -1 cm -1 ε 395 =41100 M -1 cm -1 ε 260 =18300 M -1 cm -1 MV 2+ + C 2 H 5 OH MV +  + C 2 H 5 O  hʋ

Storage of electrons in RGO. nMV +• + mGO -> nMV 2+ + mRGO[(n−m)e] (Adapted from Journal of Photochemistry and Photobiology A: Chemistry 221 (2011) 214– 219.Copyright, Elsevier.) Absorption spectrum of MV +  with increasing GO concentrations. TEM image showing a single RGO sheet.

Titration of stored electrons with Ag. RGO[(n−m)e]+ (n−m)Ag + -> RGO + (n−m)Ag (Adapted from Journal of Photochemistry and Photobiology A: Chemistry 221 (2011) 214– 219.Copyright, Elsevier.) Absorption spectra recorded following the incremental addition of Ag + solution to [MV 2+ +RGO(e)] in ethanol. TEM image showing a Ag-studded RGO sheet. B

Steady state irradiation of MV-GO. ,[object Object],[object Object],[object Object],(Adapted from Journal of Photochemistry and Photobiology A: Chemistry 221 (2011) 214– 219.Copyright, Elsevier.) Growth of absorbance at 605 nm following the UV irradiation of 100 µM MV 2+ in ethanol.

Visual Recap (Adapted from Journal of Photochemistry and Photobiology A: Chemistry 221 (2011) 214– 219.Copyright, Elsevier.)

Conclusions ,[object Object],[object Object],[object Object]

Thanks for watching! Full paper @ Journal of Photochemistry and Photobiology A: Chemistry 221 (2011) 214– 219. doi:10.1016/j.jphotochem.2011.02.024

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1. Electron transfer between methyl viologen radicals and graphene oxide: Reduction, electron storage and discharge Sachidananda Krishnamurthy, Ian V. Lightcap and Prashant V. Kamat. Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556, United States Presented by: Sachi Krishnamurthy

4. Reduction of Graphene Oxide GO Reduction RGO v v v

5. Methyl Viologen as a light absorber. ε 605 =13800 M -1 cm -1 ε 395 =41100 M -1 cm -1 ε 260 =18300 M -1 cm -1 MV 2+ + C 2 H 5 OH MV +  + C 2 H 5 O  hʋ

6. Storage of electrons in RGO. nMV +• + mGO -> nMV 2+ + mRGO[(n−m)e] (Adapted from Journal of Photochemistry and Photobiology A: Chemistry 221 (2011) 214– 219.Copyright, Elsevier.) Absorption spectrum of MV +  with increasing GO concentrations. TEM image showing a single RGO sheet.

7. Titration of stored electrons with Ag. RGO[(n−m)e]+ (n−m)Ag + -> RGO + (n−m)Ag (Adapted from Journal of Photochemistry and Photobiology A: Chemistry 221 (2011) 214– 219.Copyright, Elsevier.) Absorption spectra recorded following the incremental addition of Ag + solution to [MV 2+ +RGO(e)] in ethanol. TEM image showing a Ag-studded RGO sheet. B

9. Visual Recap (Adapted from Journal of Photochemistry and Photobiology A: Chemistry 221 (2011) 214– 219.Copyright, Elsevier.)

10.

11. Thanks for watching! Full paper @ Journal of Photochemistry and Photobiology A: Chemistry 221 (2011) 214– 219. doi:10.1016/j.jphotochem.2011.02.024

Electron transfer between methyl viologen radicals and graphene oxide

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