Enhanced electron field emission from CuO nanoplate arrays decorated with Au nanoparticles

Abstract

A simple and controllable method was reported for the decoration of CuO nanoplate arrays with Au nanoparticles. It had been achieved through the reaction between Sn 2? and AuCl 4 -in the presence of CuO nanoplate arrays. The structure and electron field emission properties of CuO nanoplate arrays decorated with different amounts of Au nanoparticles were investigated. The results demonstrated a remarkable enhancement of field emission performance of CuO nanoplate arrays decorated with Au nanoparticles. The effect of Au amount on the field emission performance was studied in detail, and excellent field emission properties such as a low turn-on electric field of 6.7 V/lm and a high field enhancement factor of 516 could be realized from the optimized sample. On the basis of experimental results, a possible mechanism for the formation of the CuO nanoplate arrays decorated with Au nanoparticles was speculated.

Electric field assisted growth and field emission properties of thermally oxidized CuO nanowires

“…In order to enhance the eld emission properties, the researchers employed various approaches to obtain surface modied, 18,19 hybrid, 20,21 and post-processed 22,23 CuO nanostructures. Recently, noble metal nanoparticles, such as Ag 18 and Au, 24 are decorated on the 1D CuO nanostructures by wet chemistry and enhanced eld emissions have been obtained due to the increased conductivity and improved semiconductor characteristics. Carbon materials (graphene oxide layers 19 and carbon nanotube network lms 25 ) and metal oxides such as ZnO nanoparticles 26 are also chosen to coat on the CuO nanostructures to improve the eld emissions.…”

Controlled Hetero‐Architectures of Au‐Nanoparticles‐Decorated ZnO Nanowires for Enhanced Field Electron Emission Displays

“…Especially, decoration of Au nanoparticles for 24 hr along the textural boundaries of ZnO nanowires yields a larger emission current density of 2.1 mA/cm 2 at a lower applied field of 1.92 V/μm. Moreover, emission current density (i. e., 2.1 mA/cm 2 ) achieved from Au@ZnO nanowires (≡ Au/ZnO/ITO) at lower applied field (i. e., 1.92 V/μm) is relatively higher than the values reported for Ag/GO/ZnO composites, CNT‐ZnO composites, ZnO nanowire/CNT heterojunction, pristine ZnO nanopillers, metal particle decorated ZnO nanorods, Au decorated ZnO nanowires/nanopillers,, and CuO nanoplates, and pristine and MoS 2 decorated β ‐TiO 2 ranorods ,. The E on of ZnO/ITO (i. e., E on = 1.56 V/μm) required to acquire current density of 10 μA/cm 2 is reduced considerably after the controlled decoration of various amounts of Au nanoparticles.…”

“…mentioned above ,,. The E on observed for Au@ZnO nanowires hetero‐architectures after decoration of Au nanoparticles for 24 hr is reasonably lower than that reported for Ag and Graphene oxide decorated ZnO nanowire array (i. e., 1.4 V/μm), ZnO nanowire/CNT heterojunction (i. e., 1.5 V/μm at current density of 1 μA/cm 2 ), nitrogen implanted ZnO nanowires (i. e., 2.4 V/μm at current density of 0.1 μA/cm 2 ), Ag and Pt decorated ZnO nanorods (i. e., 1.9 and 2.6 V/μm, respectively), and Au decorated CuO nanoplates (i. e., 6.7 V/μm) . The non‐uniform and limited distribution of Au nanoparticles over the ZnO nanowires restricted the E on to 2 V/μm (defined at 1 μA/cm 2 ) .…”

“…Despite the larger work function of 5.35 to 5.76 eV, Au nanoparticles found to perform better because of enhanced electron transfer and surface interactions . Recently, Li et al . reported electron FE from Au nanoparticle decorated CuO nanoplates, but the minimum E on was restricted to 6.7 V/μm due to the random distribution of irregular size and shape of nanoplates.…”

Enhanced Field Emission from UV-Illuminated CuO Nanowires Fabricated by Thermal Oxidation of Cu Film

“…14 Li et al demonstrated that decorated Au nanoparticles enhanced the¯eld emission performance of CuO nanoplate arrays. 15 Juan et al found that hydrogen annealing could improve thē eld emission properties of CuO nanowires. 16 For the in°uence of light illumination, Chen et al observed visible light illumination could enhance¯eld emission performance of CuO nanobelt arrays.…”