Investigation On The Electrochemical Synthesis And Properties Of Bi Nanostructures

In this thesis, Large-scale bunch-like, sharp-top Bi microstructures and Bi nanowires were synthesized via electrochemical deposition. The morphology and crystal structure of the as-grown Bi were characterized by scanning electron microscopy (SEM), x-ray diffraction and transparent electron microscopy. The formation mechanism of the nanostructures was discussed. Meanwhile, field emission properties of sharp-top Bi nanostructures are analyzed and discussed. And the bunch-like bismuth electrodes were examined for their anodic stripping voltammetry performance.This thesis contains the following works and innovations:1.Bi nanowires were synthesized by electrodeposition into the pores of anodic alumina membrane (AAO). It has a preferential growth direction along the[110] direction. The SEM and TEM photos clearly show that the bismuth nanowire arrays are large-area, high-filling and highly ordered. And the growth mechanism of these Bi nanowires is discussed.2.Large-scale bunch-like Bi microstructures were synthesized via two-step electrochemical deposition. Due to the high surface-to-volume ratio, electrochemical sensing platform towards heavy metal ions with high sensitivity characteristic of the bunch-like Bi has been investigated, which exhibits that it also has potential application in an effective and high performance electrochemical sensor.3.Floc Bi and sharp-top Bi microstructures were synthesized on ITO glass substructure by electrochemical deposition for the first time.SEM images show that these sharp-top Bi nanostuctures composed of many nanowires,and reveal a clear and well-defined tip top. Field emission (FE) measurements demonstrated that the-1 sharp-top Bi possessed good performance with a turn-on field of-7.2 Vμm and a field enhancement factor of 575,which have promising application as a competitive cathode material in FE microelectronic devices.