Synthesis of platinum nanowheels using a bicellar template.
Disk-like surfactant bicelles provide a unique meso-structured reaction environment for templating the wet-chemical reduction of platinum(II) salt by ascorbic acid to produce platinum nanowheels. The Pt wheels are 496 +/-55 nm in diameter and possess thickened centers and radial dendritic nanosheets (about 2-nm in thickness) culminating in flared dendritic rims. The structural features of the platinum wheels arise from confined growth of platinum within the bilayer that is also limited at edges of the bicelles. The size of CTAB/FC7 bicelles is observed to evolve with the addition of Pt(II) complex and ascorbic acid. Synthetic control is demonstrated by varying the reaction parameters including metal salt concentration, temperature, and total surfactant concentration. This study opens up opportunities for the use of other inhomogeneous soft templates for synthesizing metals, metal alloys, and possibly semiconductors with complex nanostructures.
Song
Yujiang
Y
Advanced Materials Laboratory, Sandia National Laboratories, Albuquerque, New Mexico 87106, USA. ysong@sandia.gov
Dorin
Rachel M
RM
Garcia
Robert M
RM
Jiang
Ying-Bing
YB
Wang
Haorong
H
Li
Peng
P
Qiu
Yan
Y
van Swol
Frank
F
Miller
James E
JE
Shelnutt
John A
JA
D001205:Ascorbic Acid / Q000737:chemistry; D050091:Dendrimers / Q000138:chemical synthesis / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry*; D008823:Micelles; D046529:Microscopy, Electron, Transmission; D010984:Platinum / Q000737:chemistry*; D013501:Surface-Active Agents / Q000737:chemistry
D050091:Dendrimers; D008823:Micelles; D013501:Surface-Active Agents; D010984:Platinum; D001205:Ascorbic Acid