Ordered mesoporous materials from metal nanoparticle-block copolymer self-assembly.
The synthesis of ordered mesoporous metal composites and ordered mesoporous metals is a challenge because metals have high surface energies that favor low surface areas. We present results from the self-assembly of block copolymers with ligand-stabilized platinum nanoparticles, leading to lamellar CCM-Pt-4 and inverse hexagonal (CCM-Pt-6) hybrid mesostructures with high nanoparticle loadings. Pyrolysis of the CCM-Pt-6 hybrid produces an ordered mesoporous platinum-carbon nanocomposite with open and large pores (>/=10 nanometers). Removal of the carbon leads to ordered porous platinum mesostructures. The platinum-carbon nanocomposite has very high electrical conductivity (400 siemens per centimeter) for an ordered mesoporous material fabricated from block copolymer self-assembly.
Warren
Scott C
SC
Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, USA.
Messina
Lauren C
LC
Slaughter
Liane S
LS
Kamperman
Marleen
M
Zhou
Qin
Q
Gruner
Sol M
SM
DiSalvo
Francis J
FJ
Wiesner
Ulrich
U