Abstract
We report the inversion of current rectification direction in a phosphododecamolybdic acid (PMo12)/single-walled carbon nanotube (SWNT) nanoscale junction resulted from a change in the particle size or chirality of the SWNTs. Results of Kelvin probe force microscopy (KPFM) studies demonstrated that the charge distribution of PMo12/SWNT in semiconducting SWNTs was opposite to that of metallic SWNTs, owing to differences in the efficiency of charging from the SWNTs to PMo12. The mechanism of the inversion of rectification direction involves combination of the usual p–n junction and current–voltage (I–V) drift induced by the dipole moment at the PMo12/SWNT interface.
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