title: Electrical transport properties of peptide nanotubes coated with gold nanoparticles via peptide-induced biomineralization.
abstract: We present temperature dependent electrical transport measurements of peptide nanotube devices coated with monodisperse arrays of gold nanoparticles (AuNP). As the temperature is lowered, the current-voltage (I-V) characteristics become increasingly nonlinear and below 20 K conduction only occurs above a threshold voltage V(T). The current follows the scaling behavior I ∝ [(V − V(T))/V(T)]α for V > V(T) with α ∼ 2.5 signifying two-dimensional (2D) charge transport. The temperature dependence of the resistance shows thermally activated behavior with an activation energy of 18.2 meV corresponding to the sequential tunneling of charges through 6 nm monodispersed AuNP arrays grown on a peptide surface.
authors.affiliation: Nanoscience Technology Center, University of Central Florida, Orlando, FL 32826, USA.
authors.forename: Shashank
authors.initials: S
authors.lastname: Shekhar
authors.forename: Luona
authors.initials: L
authors.lastname: Anjia
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Matsui
authors.forename: Saiful I
authors.initials: SI
authors.lastname: Khondaker
mesh_terms: D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D003460:Crystallization / Q000379:methods; D004553:Electric Conductivity; D004579:Electron Transport; D006046:Gold / Q000737:chemistry*; D008422:Materials Testing; D008903:Minerals / Q000737:chemistry*; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure*; D010455:Peptides / Q000737:chemistry*
chemical_list: D020099:Coated Materials, Biocompatible; D008903:Minerals; D010455:Peptides; D006046:Gold