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Electron transfer between methyl viologen radicals and graphene oxide: Reduction, electron storage and discharge Sachidana...
Graphene as a material. C.N.R. Rao, A.K. Sood, R. Voggu and K.S. Subrahmanyam, Some Novel Attributes of Graphene. The Jour...
Graphene Oxide(GO)- Modified Hummer’s method. <ul><li>Easily processible </li></ul><ul><li>Useful in wet chemistry </li></...
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...
Storage of electrons in RGO. nMV +•  + mGO -> nMV 2+  + mRGO[(n−m)e] (Adapted from Journal of Photochemistry and Photobiol...
Titration of stored electrons with Ag. RGO[(n−m)e]+ (n−m)Ag +  -> RGO + (n−m)Ag (Adapted from Journal of Photochemistry an...
Steady state irradiation of MV-GO. <ul><li>Net accumulation of electrons in GO is 0.88 nano-mol per µg. </li></ul><ul><li>...
Visual Recap (Adapted from Journal of Photochemistry and Photobiology A: Chemistry 221 (2011) 214– 219.Copyright, Elsevier.)
Conclusions <ul><li>Graphene oxide is capable of accepting and storing electrons from methyl viologen radicals. </li></ul>...
Thanks for watching! Full paper @  Journal of Photochemistry and Photobiology A: Chemistry 221 (2011) 214– 219. doi:10.101...
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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.

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Electron transfer between methyl viologen radicals and graphene oxide

  1. 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
  2. 2. 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. <ul><li>Nanoelectronics </li></ul><ul><li>Energy storage and conversion </li></ul><ul><li>Drug delivery </li></ul><ul><li>Sensing </li></ul><ul><li>Catalysis </li></ul><ul><li>Theoretical surface area of 2600 m 2 /g </li></ul><ul><li>Electron mobility of 2 x10 5 cm 2 /(V s) </li></ul>Proto type Material
  3. 3. Graphene Oxide(GO)- Modified Hummer’s method. <ul><li>Easily processible </li></ul><ul><li>Useful in wet chemistry </li></ul><ul><li>Dispersions in various solvents possible </li></ul>
  4. 4. Reduction of Graphene Oxide GO Reduction RGO v v v
  5. 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. 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. 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
  8. 8. Steady state irradiation of MV-GO. <ul><li>Net accumulation of electrons in GO is 0.88 nano-mol per µg. </li></ul><ul><li>Net accumulation of electrons in RGO is 0.7 nano-moles per µg. </li></ul><ul><li>0.18 nano-moles of electrons were used up in reducing a µg of GO TO RGO. </li></ul>(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.
  9. 9. Visual Recap (Adapted from Journal of Photochemistry and Photobiology A: Chemistry 221 (2011) 214– 219.Copyright, Elsevier.)
  10. 10. Conclusions <ul><li>Graphene oxide is capable of accepting and storing electrons from methyl viologen radicals. </li></ul><ul><li>RGO serves as a scaffold to anchor Ag nanoparticles. </li></ul><ul><li>The RGO/Ag nanocomposites discussed in the present work offer new opportunities to design next generation photocatalysts . </li></ul>
  11. 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

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