Enhanced Field Emission of Composite Au Nanostructured Network n Si Nanoporous Pillar Array

Nanocrystallites Au particles are deposited on a well-aligned silicon nanoporous pillar array (Si-NPA) surface through immersion plating to form an Au/Si-NPA composite system. It is found that a large number of Au nanoparticles are accumulated on the bottom of Si pillars to form a regular network structure. By studying the field emission properties of such an Au/Si-NPA composite system, we find that the Au/Si-NPA exhibits good field emission properties, with staring field about 2V/μm and emission current density 67μA/cm² at 7.59V/μm. The enhanced field emission can be deduced from the unique morphology and structure of Au/Si-NPA.