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SmB 6 is believed as an ideal candidate for FE applications because of their unique properties. Up to date, the effect of image potential on the field emission (FE) behaviors of one-dimensional nanostructures is still unclear in experiments, and thus it becomes a challenging issue for the researchers. In this paper, the effect of image potential on FE properties of SmB 6 nanowires are detailed studied by combination of experimental results and the generalized Schottky-Nordheim (SN) model. The experimental results show that they have a turn-on field of 3.4 V/μm (at 10 μΑ/cm2). Meanwhile, the image potential factor of SmB 6 nanowires is calculated to be equal to 1 based on our model, which is resemble to ideal metal plane.

Lanthanum hexaboride (LaB 6 ) nanowires have attracted much attention due to their outstanding physical properties. In order to enhance the developments of LaB 6 nanowires, it is essential to study the field emission (FE) properties of LaB 6 nanowires in different environments. Here, we investigate the effect of oxygen (O 2 ) on the FE behaviors of LaB 6 nanowires. And it is found that the oxygen content attaching on the surface of LaB 6 nanowires strongly affect their FE properties.