Electrical transport and structural properties of platinum nanowires, deposited using the focussed ion beam method have been investigated. Energy dispersive X-ray spectroscopy reveals metal-rich grains (atomic composition 31% Pt and 50% Ga) in a largely non-metallic matrix of C, O and Si. Resistivity measurements (15-300 K) reveal a negative temperature coefficient with the room-temperature resistivity 80-300 times higher than that of bulk Pt. Temperature dependent current-voltage characteristics exhibit non-linear behaviour in the entire range investigated. The conductance spectra indicate increasing non-linearity with decreasing temperature, reaching 4% at 15 K. The observed electrical behaviour is explained in terms of a model for inter-grain tunnelling in disordered media, a mechanism that is consistent with the strongly disordered nature of the nanowires observed in the structure and composition analysis.
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Mechanical Engineering
- Mechanics of Materials
- Materials Science(all)
Dawson, P., Penate-Quesada, L., & Mitra, J. (2007). Non-linear electronic transport in Pt nanowires deposited by focused ion beam. Nanotechnology, 18(21)(21), 215203:1-215203:5. . https://doi.org/10.1088/0957-4484/18/21/215203