dx.doi.org/10.1021/jp309529b | J. Phys. Chem. C 2013, 117, 571
Jan 24, 2015
dx.doi.org/10.1021/jp309529b | J. Phys. Chem. C 2013, 117, 571−577
2 nm
•Theoretical surface area of 2600 m2g-1
•Electron mobility of 2 x105 cm2V-1s-1
•Nanoelectronics
•Energy storage and conversion
•Drug delivery
•Sensing
•Catalysis
2010, 22, 4467–4472.
A Multifunctional Catalyst Assembly?
Photocatalytic splitting of water
- Selectivity-Improved charge separation
• Detect and Destroy Of organic pollutants
m M1(s) + n M2m+
(aq) m M1n+
(aq) + n M2(s)
E0 (M1n+ /M1) pair must be lower than E0 (M2
m+ /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 for Metal Nanostructures
RGO Mediated Galvanic Exchange
RGO(e-) + Ag+ RGO + Ag
Ag(s) + AuCl4 -
(sol) Au(s) + Ag+(sol) + 4Cl -
(sol)
AuCl4-
Ag+
e
hʋTiO2
h
e
ETOH
EtO•
TiO2 + h TiO2 (e + h)
TiO2 (e + h) + EtOH TiO2 (e) + EtO•
TiO2 (e) + GO TiO2 + RGO(e)
TEM Characterization
(1-210)
(0-110)
Methyl Viologen Photocatalysis
Conclusions
• Galvanic exchange between Ag nanoparticles and Au3+ ions can be carried out on RGO sheet in a controlled way.
• RGO is capable of anchoring both semiconductor and metal nanoparticles.
• Photocatalysis experiments of MV2+ reduction show mediation of metal nanoparticles and RGO in electron transfer.
Thanks for watching!Full paper @ J.Phys. Chem. C, 2013, 117, 571−577.
doi:10.1021/jp309529b