1. dx.doi.org/10.1021/jp309529b | J. Phys. Chem. C 2013, 117, 571−577

2. 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.

3. A Multifunctional Catalyst Assembly?
Photocatalytic
splitting of water
- Selectivity
-Improved charge
separation
• Detect and
Destroy Of organic
pollutants

4. m M1(s) + n M2
m+
(aq)  m M1
n+
(aq) + n M2(s)
E0 (M1
n+ /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

5. RGO Mediated Galvanic Exchange
RGO(e-) + Ag+  RGO + Ag
Ag(s) + AuCl4
-
(sol)  Au(s) + Ag+
(sol) + 4Cl -
(sol)
AuCl4
-
Ag
+
e
hʋ
TiO2
h
e
ETOH
EtO•
TiO2 + hn  TiO2 (e + h)
TiO2 (e + h) + EtOH  TiO2 (e) + EtO•
TiO2 (e) + GO  TiO2 + RGO(e)
AgAu

6. TEM Characterization
(1-210)
(0-110)

7. Methyl Viologen Photocatalysis

8. 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.

9. Full paper @ J.Phys. Chem. C, 2013, 117, 571−577.
doi:10.1021/jp309529b