A systematic study is reported about the amount-dependent morphology change in a series of Au-Pt bimetallic nanoparticles synthesized using chemical reduction. The amount of Au precursor is kept constant throughout whole series of compounds to obtain fixed Au core size (~7.5 nm). The Au/Pt ratio is varied from 1/1 to 1/4 in order to synthesize Pt shell layer of different thickness. We observed a remarkable shift of surface plasmon band around 410 nm. With the aid of high resolution transmission electron microscope (HRTEM) and energy-dispersive spectrometer (EDS), the composition of shell layer is found to be Pt enriched Au-Pt alloy. As the amount of Pt increases, the Pt clusters formed a string-like shape on the surface of nanoparticles. The average diameter of these Pt clusters is about 2 nm. This special structure may exhibit unique catalytic property.
This is a preview of subscription content, access via your institution.
Buy single article
Instant access to the full article PDF.
Tax calculation will be finalised during checkout.
N. Toshima, M. Harada, Y. Yamazaki and K. Asakura, J. Phys. Chem. 96, 9927 (1992).
M. Harada, K. Asakura and N. Toshima, J. Phys. Chem. 97, 5103 (1993).
N. Toshima and T. Yonezawa, New J. Chem. 1179 (1998).
L. L. Beecroft and C. K. Ober, Chem. Mater. 9, 1302 (1997).
W. H. Sang, K. Yunsoo and K. Kwan, J. Colloid. Interface Sci. 208, 272 (1998).
S. Link, Z. L. Wang and M. A. EI-Sayed, J. Phys. Chem. B 103, 3529 (1999).
M. P. Mallin and C. J. Murphy, Nano Lett. 2, 1235 (2002).
K. Mallik, M. Mandal, N. Pradhan and T. Pal, Nano Lett. 1, 319 (2001).
M.-L. Wu, D.-H Chen and T.-C. Huang, Chem. Mater. 13, 599 (2001).
S. Remita, G. Picq, J. Khatouri and M. Mostafavi, Radiat. Phys. Chem. 54, 463 (1999).
G. Mie, Ann. Physik, 25, 377 (1908).
I. Srnova-Sloufova, F. Lrantisek, A. Gemperle and J. Gemperlova, Langmuir 16, 9928 (2000).
This work was performed under contact Nos. NSC92-2113-M-002-036 and NSC92-2215-E-492 -008 from the National Science Council of the Republic of China.
About this article
Cite this article
Liu, RS., Chen, HM. & Hu, SF. Synthesis and Characterization of Novel Au(core)-Au/Pt Alloy(shell) Nanostructure. MRS Online Proceedings Library 818, 299–304 (2004). https://doi.org/10.1557/PROC-818-M5.45.1