Galvanic exchange on Reduced Graphene Oxide

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Galvanic exchange on Reduced Graphene Oxide

  1. 1. dx.doi.org/10.1021/jp309529b | J. Phys. Chem. C 2013, 117, 571−577
  2. 2. 2 nm•Theoretical surfacearea of 2600 m2g-1•Electron mobility of2 x105 cm2V-1s-1•Nanoelectronics•Energy storage andconversion•Drug delivery•Sensing•Catalysis2010, 22, 4467–4472.
  3. 3. A Multifunctional Catalyst Assembly?Photocatalyticsplitting of water- Selectivity-Improved chargeseparation• Detect andDestroy Of organicpollutants
  4. 4. m M1(s) + n M2m+(aq)  m M1n+(aq) + n M2(s)E0 (M1n+ /M1) pair must be lower than E0 (M2m+ /M2).e.g. 3Ag(s) + Au3+(aq)  3Ag+(aq) + Au(s)J. Am. Chem. Soc. 2007, 129, 1733-1742.Nano Lett. 2002, 2, 481-485.Galvanic Exchange- Using Silver Templates forMetal Nanostructures
  5. 5. RGO Mediated Galvanic ExchangeRGO(e-) + Ag+  RGO + AgAg(s) + AuCl4-(sol)  Au(s) + Ag+(sol) + 4Cl -(sol)AuCl4-Ag+ehʋTiO2heETOHEtO•TiO2 + hn  TiO2 (e + h)TiO2 (e + h) + EtOH  TiO2 (e) + EtO•TiO2 (e) + GO  TiO2 + RGO(e)AgAu
  6. 6. TEM Characterization(1-210)(0-110)
  7. 7. Methyl Viologen Photocatalysis
  8. 8. Conclusions• Galvanic exchange between Ag nanoparticles and Au3+ ionscan be carried out on RGO sheet in a controlled way.• RGO is capable of anchoring both semiconductor and metalnanoparticles.• Photocatalysis experiments of MV2+ reduction showmediation of metal nanoparticles and RGO in electron transfer.
  9. 9. Full paper @ J.Phys. Chem. C, 2013, 117, 571−577.doi:10.1021/jp309529b
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