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Electron transfer between methyl viologen radicals and graphene oxide
Electron transfer between methyl viologen radicals and graphene oxide
Electron transfer between methyl viologen radicals and graphene oxide
Electron transfer between methyl viologen radicals and graphene oxide
Electron transfer between methyl viologen radicals and graphene oxide
Electron transfer between methyl viologen radicals and graphene oxide
Electron transfer between methyl viologen radicals and graphene oxide
Electron transfer between methyl viologen radicals and graphene oxide
Electron transfer between methyl viologen radicals and graphene oxide
Electron transfer between methyl viologen radicals and graphene oxide
Electron transfer between methyl viologen radicals and graphene oxide
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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 …

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