High magnetic field quantum transport in Au nanoparticle-cellulose films.
We report the magneto-transport properties of cellulose films comprising interconnected networks of gold nanoparticles (Au NPs). Cellulose is a biopolymer that can be made electrically conducting by cellulose regeneration in Au NP dispersions. The mechanism of electronic conduction in the Au-cellulose films changes from variable range hopping to metallic-like conduction with decreasing resistivity. Our experiments in high magnetic fields (up to 45 T) reveal negative magnetoresistance in the highly resistive films. This is attributed to the spin polarization of the Au NPs and the magnetic field induced suppression of electron spin flips during spin-polarized tunneling in the NP network.
School of Physics and Astronomy, University of Nottingham, Nottingham, UK. Lyudmila.Turyanska@nottingham.ac.uk
L
L
Turyanska
O
O
Makarovsky
A
A
Patanè
N V
NV
Kozlova
Z
Z
Liu
M
M
Li
S
S
Mann
D002482:Cellulose / Q000737:chemistry* / Q000648:ultrastructure; D004560:Electricity; D006046:Gold / Q000737:chemistry*; D060526:Magnetic Fields; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D009038:Motion; D011789:Quantum Theory; D013696:Temperature
D006046:Gold; D002482:Cellulose