Department of Applied Chemistry, University of Johannesburg, P.O. Box 17011, Doornfontein 2028, South Africa.
Carbohydr Polym. 2013 Feb 15;92(2):1402-7. doi: 10.1016/j.carbpol.2012.10.008. Epub 2012 Oct 12.
This work describes the stabilisation of silver and copper nanoparticles in chemically modified chitosan colloidal solution. Chitosan-N-2-methylidene-hydroxy-pyridine-6-methylidene hydroxy thiocarbohydrazide (CSPTH) was used as a stabilising and reducing agent for silver and copper nanoparticles. The modified chitosan derivatives and the synthesised nanoparticles were characterised by Fourier transform infrared (FT-IR) spectroscopy, Ultraviolet-visible (UV-Vis) spectroscopy and X-ray diffraction (XRD). Particle size, morphology and segregation of the nanoparticles were determined by transmission electron microscopy (TEM). The size of the nanoparticles was found to be less than 20 nm and 50 nm for silver and copper nanoparticles, respectively. These nanoparticles were stabilised in a chemically modified chitosan solution and their properties were studied using fluorescence spectroscopy, photoluminescence spectroscopy and surface-enhanced Raman scattering (SERS). The optical properties of silver nanoparticles in surface plasmon band (SPB) were enhanced at 407 nm compared to those of copper nanoparticles. Fluorescence (400 nm and 756 nm), photoluminescence (450 and 504 nm) and Raman scattering (1382 and 1581 cm(-1)) properties for the copper nanoparticles were superior to those of the silver nanoparticles.
本文描述了银和铜纳米粒子在化学修饰壳聚糖胶体溶液中的稳定化。壳聚糖-N-2-亚甲基-羟基-吡啶-6-亚甲基羟基亚硫代氨基甲酸盐（CSPTH）被用作银和铜纳米粒子的稳定剂和还原剂。修饰的壳聚糖衍生物和合成的纳米粒子通过傅里叶变换红外（FT-IR）光谱、紫外-可见（UV-Vis）光谱和 X 射线衍射（XRD）进行了表征。通过透射电子显微镜（TEM）测定了纳米粒子的粒径、形貌和分离。发现银和铜纳米粒子的粒径分别小于 20nm 和 50nm。这些纳米粒子在化学修饰的壳聚糖溶液中稳定存在，并使用荧光光谱、光致发光光谱和表面增强拉曼散射（SERS）研究了它们的性质。与铜纳米粒子相比，银纳米粒子在表面等离激元带（SPB）中的光学性质在 407nm 处得到增强。铜纳米粒子的荧光（400nm 和 756nm）、光致发光（450nm 和 504nm）和拉曼散射（1382nm 和 1581cm(-1)）性质优于银纳米粒子。
