▎ 摘　　要

A novel one-pot synthesis of polypyrrole (PPy)/reduced graphene oxide (r-GO) nanocomposites with the aim of assessing their potential as a cold cathode material is reported. r-GO was prepared by a modified Hummers and Offeman method. The nanocomposites were characterized by transmission electron microscopy, field-emission scanning electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy and Raman spectroscopy. The isothermal DC conductivity of PPy was found to increase by four orders of magnitude (2160 S/m) on rGO doping. The nanocomposites were explored for field emission, and the results fitted well to the Fowler-Nordheim model of emission. The maximum values of the current density (26 mu A/cm(2)) and the field enhancement factor (beta = 8.0 x 10(4)) were obtained for PPy/r-GO (10%) for a very small turn-on field (1.3 V/mu m), and are much higher than those of any other polymer-based nanocomposite.