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