The Building Of One-dimensional Metal Nanowire Arrays And The Research Of Its Optical Properties

One-dimensional mental nanomameteials have broad application propects in themicro-nano devices, strong toughness composite materials, new probe and otherfields. Particularly, the research of one-dimensional nobal metal nanomaterials hasbecome the research focus in the nanomaterial fields because of its unique electronicstructure and anisotropic morphology. Ag nanowires/Au nanorods array processingoptical polarization property has aroused many researchers′attention. In this paper, thedirectional assembly of Ag nanowires/Au nanorods and the optical polarizationproperty of nanowires/nanorods arrays were studied. First, a mass of Ag nanowiresand Au nanorods were synthesized. Second, the films inset with Ag nanowires/Aunanorods arrays were prepared by dip-coating on glass sheets. Then a system ofresearch on the alignment of Ag nanowires/Au nanorods, the polarizationperformance of films and the align mechanism of nanowires/nanorods was carried out.The main conclusions are as follows:1. Amount of Ag nanowires with10μm length and70-80nm diameter weresuccessfully synthetized by alcohol-thermal method, Au nanorods with40-50nmlength and10nm diameters by seed-mediated method. The results of Uv-visabsorption spectra shows that the longitudinal absorption peaks of Ag nanowires werein near-infrared wave band and Au nanorods at650-1100nm band, which is theprecondition of building nanowire/nanorods arrays processing polarization propertyin the visible to near-infrared wave band.2. PVP/ethanol solution was chosen as the dispersant and the films inset with Agnanwire arrays were prepared by dip-coating technique. The studies showed thatviscosity of dispersant had important effect on aligning Ag nanowires and dispersantwith higher viscosity could align Ag nanowires better. When the dispersant viscositywas fixed at216mPa·s, the deposition density of Ag nanowires became larger and thealignment of Ag nanowires became better with increasing the pulling speed, but thethe orientational effect of Ag nanowires was unobvious and Ag nanowires depositedrandomly in films when the pulling speed reched65mm/min. For one-off dip-coatingaligning Ag nanowires researchs the optimum parameters was530mPa·s viscosity and10mm/min pulling speed. For multiple dip-coating the optimum parameters was530mPa·s viscosity,3mm/min pulling speed and3times dip-coating. Besides, thealignment effects of Ag nanowire arrays prepared by multiple times dip-coatingwerebetter than one-off dip-coating.3. The results of polarization spectrum test shows that Ag nanowires was alignedby dip-coating method and the films inset with Ag nanowire arrays performedpolarization properties in the1000-1900nm wave band.4. PVP/ethanol solution was chosen as the dispersant and the films inset with Aunanorod arrays were prepared by dip-coating technique. The optimum parameters was60mPa·s viscosity,15mm/min pulling speed and one times dip-coating. The filmprepared under optimum parameters showed obvious optical polarization effect at therange of650-1100nm wavelength.