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BN nanotubes. (a) SEM image shows high purity BNNTs. (b) TEM image shows a bamboolike structure feature. (c) High resolution TEM image shows that the interplanar spacing is .
TEM images of Au-BNNTs under different sputtering times. (a) Small Au spots are obtained at . (b) The size of the Au spots increases at ; inset TEM image shows a Au spot with the interplanar spacing of which refers to Au (111) planes. (c) some Au-spots combine together to form Au islands at . (d) Au islands are connected to form quasicontinuous Au coating at .
Conductance of the Au-BNNTs with respect to different sputtering times. After , there is a linear relationship between the conductance and sputtering time.
features of Au40, Au80, and Au120. The linear relationship suggests Ohmic contact between the single nanotube and electrodes for all of samples.
Emission current densities of pure and Au-decorated BNNTs as a function of . The emission current density of the pure BNNTs is unsaturated at high field. The emission current density of Au40 increases by almost two orders, and it remains in the unsaturated state under the same macroscopic electrical field. For Au80, the current density saturation appears at the high electrical field range. The inset shows corresponding FN plots in which the Au80 has a significant variation in the slope.
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