| AVS 60th International Symposium and Exhibition | |
| Nanometer-scale Science and Technology | Wednesday Sessions |
| Session NS+BI+EM-WeA |
| Session: | Nanopatterning and Nanolithography |
| Presenter: | A.D. Taylor, Yale University |
| Authors: | J. Schroers, Yale University A.D. Taylor, Yale University R.C. Sekol, Yale University G. Doubek, IPEN, Brazil G. Kumar, Texas Tech University M. Carmo, Forschungszentrum Jülich GmbH, Germany F. Gittleson, Yale University N. Hardesty-Dyck, Yale University S. Mukherjee, University of North Texas |
| Correspondent: | Click to Email |
Here we report a unique CMOS compatible approach using bulk metallic glass Pt58Cu15Ni5P22 (Pt-BMG) [1] to create high performance fuel cell catalysts. We have shown that these materials can be nanoimprinted into ~10 nm diameter rods with aspect ratio up to 200 [2]. A nanoporous Al2O3 was used as a template to create the nanorod surface. The Pt-BMG is heated into the supercooled liquid region where it softens and can be thermoplastically imprinted. Under an applied pressure (ca. 50 MPa) the Pt-BMG fills the nanopores. An additional step can separate the nanorods from the reservoir [3]. The uniformly vertical nanorods are well-isolated and parallel to one another.
Our results show that these materials are highly active with lower onset potentials for CO, methanol, and ethanol oxidation [4]. In this talk we will demonstrate how these BMG systems can also serve as a platform for stategically designed catalyst systems. As a proof of concept we have modified the surface of a Pt-BMG by depositing ruthenium using underpotential deposition. We show that this approach facilitates the fabrication of multicomponent nanowires having elements outside of the glass formability with enhanced methanol oxidation beyond the initial Pt-BMG.
References:
1. Schroers, J. and W.L. Johnson, Highly processable bulk metallic glass-forming alloys in the Pt-Co-Ni-Cu-P system. Applied Physics Letters, 2004. 84(18): p. 3666-3668.
2. Kumar, G., H.X. Tang, and J. Schroers, Nanomoulding with amorphous metals. Nature, 2009. 457(7231): p. 868-872.
3. Schroers, J., Q. Pham, and A. Desai, Thermoplastic forming of bulk metallic glass - A technology for MEMS and microstructure fabrication. Journal of Microelectromechanical Systems, 2007. 16(2): p. 240-247.
4. Carmo, M., et al., Bulk Metallic Glass Nanowire Architecture for Electrochemical Applications. Acs Nano, 2011. 5(4): p. 2979-2983.