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Flexible CNT-array cathodes: Effect of bending on field electron emission

Recently, flexible field-emission emitters based on carbon nanotubes (CNTs) materials attract some interests because of their perspective for applications. Those devices inherit both superior field-emission properties of CNTs and high flexibility of polymers such as PDMS (poly-dimethylsiloxane), PET (polyethylene-terephthalate), and EPDM (ethylene-propylene-diene rubber) [1–3]. In a general trend, we were successful to make flexible CNTs-based emitters using PDMS as a flexible platform. Field emission measurements revealed a high current density of 72 mA/cm2 (a respective net current of 0.57 mA) [4]. However, effect of bending on field emission characteristics is not paid attention much in the published literatures. In this work, we report results showing a correlation between the curvature of PDMS-supported CNT-tip arrays and their emission properties.