The study on synthesis and optical properties of metal sulfide nanowires

• Main Authors: Chien Wu, 伍健
• Other Authors: Jen-Bin Shi
• Format: Others
• Language: en_US
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/12451470670669137074

博士 === 逢甲大學 === 電機與通訊工程所 === 96 === Crystalline metal sulfide (PbS, CuS) nanowire arrays have been successfully fabricated by AC applied DC electrochemical deposition from aqueous solutions of dimethylsulfoxide DMSO solution containing metal chloride (PbCl2, CuCl) and elemental sulfur into anodic alumina membranes (AAM). By utilizing the template method a general approach for synthesizing nanomaterials within the pores of membranes and the growth of nanowire is controllable almost exclusively in the direction normal to the substrate surface, and then we could electrodeposit different-size nanowire depending on the varied template. These nanowires have uniform diameters of approximately 30 nm (sulfuric acid AAM) or 60 nm (oxalic acid AAM), and their lengths are up to tens of micrometers. Scanning electron microscopy (SEM) indicates that the ordered metal sulfide (PbS, CuS) nanowire arrays are completely embedded. Their results of X-ray diffraction (XRD) show that the as-synthesized nanowires are crystalline with highly preferential orientation. Energy dispersive spectrometer (EDS) analysis shows that the composition ratio is very close to 1:1. In the measurement of ultraviolet-visible absorption spectroscopy (UV-vis), for PbS nanowires the spectrum could observe the quantum confinement effects compared between 30 nm and 60 nm PbS nanowire arrays. For CuS nanowires, the absorbance in UV-Vis spectrum might be attributed from the varied copper sulfide phase. The high energy absorbance might be due to the characteristic of Cu2S composition. The broad and strong absorbance in the near-IR region might be due to the characteristic of CuS.