title: Synthesis, optical properties, stability, and encapsulation of Cu-nanoparticles.
abstract: 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.
authors.affiliation: Nano-science Research Lab, Department of Chemistry, Jamia Millia Islamia (Central University), New Delhi 110025, India.
authors.forename: Ommer
authors.initials: O
authors.lastname: Bashir
authors.affiliation: Nano-science Research Lab, Department of Chemistry, Jamia Millia Islamia (Central University), New Delhi 110025, India.
authors.forename: Shokit
authors.initials: S
authors.lastname: Hussain
authors.affiliation: Department of Chemistry, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia.
authors.forename: Shaeel Ahmed
authors.initials: SA
authors.lastname: AL-Thabaiti
authors.affiliation: Department of Chemistry, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia. Electronic address: drkhanchem@yahoo.co.in.
authors.forename: Zaheer
authors.initials: Z
authors.lastname: Khan
mesh_terms: D003300:Copper / Q000737:chemistry*; D006834:Hydrazines / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D010084:Oxidation-Reduction; D056951:Photoelectron Spectroscopy; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D013213:Starch / Q000737:chemistry; D013818:Thermogravimetry; D014961:X-Ray Diffraction
chemical_list: D006834:Hydrazines; C029424:hydrazine; D003300:Copper; D013213:Starch
keywords: Chemical synthesis; Electron diffraction; Nanostructures; Optical properties