Bashir Ommer, Hussain Shokit, AL-Thabaiti Shaeel Ahmed, Khan Zaheer
Nano-science Research Lab, Department of Chemistry, Jamia Millia Islamia (Central University), New Delhi 110025, India.
Department of Chemistry, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia.
Spectrochim Acta A Mol Biomol Spectrosc. 2015 Apr 5;140:265-73. doi: 10.1016/j.saa.2014.12.065. Epub 2015 Jan 5.
Starch-capped copper nanoparticles (CuNPs) were prepared by a chemical reduction method using hydrazine, copper sulfate and starch as reducing, oxidizing and stabilizing agents, respectively, for the first time at room temperature. The products were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), electron diffraction patterns (EDX), X-ray photoelectron spectroscopy (XPS), fourier transform infrared (FT-IR) spectroscopy, thermo-gravimetric analysis (TGA), and ultraviolet-visible spectroscopy. The effect of [starch], [hydrazine] and [copper sulfate] on the optical properties of CuNPs were studied by UV-visible spectrophotometrically. The hydrazine concentrations have large impact on the surface Plasmon resonance absorbance, nature of the reaction time curves and reaction rates decreases with [hydrazine]. Starch concentrations have no effect on the path of the CuNPs formation. The hexahedral with some irregular shaped CuNPs were formed in presence of starch with diameter 900 nm. Starch acted as a stabilizing, shape-directing and capping agent during the growth processes. The KI-I2 reagent could not replace CuNps from the inner helical structure of starch.
首次在室温下采用化学还原法，分别以肼、硫酸铜和淀粉作为还原剂、氧化剂和稳定剂制备了淀粉包覆的铜纳米颗粒（CuNPs）。通过X射线衍射（XRD）、透射电子显微镜（TEM）、电子衍射图谱（EDX）、X射线光电子能谱（XPS）、傅里叶变换红外（FT-IR）光谱、热重分析（TGA）和紫外可见光谱对产物进行了表征。通过紫外可见分光光度法研究了[淀粉]、[肼]和[硫酸铜]对CuNPs光学性质的影响。肼浓度对表面等离子体共振吸光度有很大影响，反应时间曲线的性质以及反应速率随[肼]的增加而降低。淀粉浓度对CuNPs的形成路径没有影响。在淀粉存在的情况下形成了直径为900 nm的具有一些不规则形状的六面体CuNPs。在生长过程中，淀粉充当稳定剂、形状导向剂和封端剂。KI-I2试剂无法从淀粉的内部螺旋结构中取代CuNps。
