| In this paper,Large-scale CuO honeycombs and Cu dendritic nanostructures were synthesized by electrochemical deposition.The formation mechanism of the nanostructures was discussed.Meanwhile,field emission and humidity sensing characteristics of honeycomb-like CuO and field emission properties of Cu dendritic nanostructures are analyzed and discussed.This thesis contains the following works and innovations:1.The CuO nanowires,nanorods,nanodisks and honeycombs are synthesized by changing the solution concentration,reaction time,and electric field.And the growth mechanism of honeycomb-like CuO nanostructures is discussed.2.Field emission(FE) measurements demonstrated that the CuO honeycombs possessed good performance with a turn-on field of 6-7Vμm-1 and a field enhancement factor of 1361,which have promising application as a competitive cathode material in FE microelectronic devices.Due to the high surface-to-volume ratio,the humidity sensitive characteristic of the CuO honeycomb film has been investigated,which exhibits that it also has potential application in an effective and high performance humidity sensor.3.Cu dendritic nanostructures were synthesized on ITO glass substructure by electrochemical deposition.SEM images show that these Cu dendritic nanostuctures reveal a clear and well-defined dendritic fractal structure with a pronounced trunk and highly ordered branches distributed on both sides of the trunk.The fractal growth mechanism of this nanostructure has been studied.Field emission properties of the Cu dendritic nanostructures were measured,which have possessed good performance with a turn-on field of 7.5 V/μm(defined as the electric field required to be tested a current density of 0.1 mA/cm2) and the field enhancement factorβof 1094.
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