X-ray Absorption Studies on Cu_doped ZnO Nanoparticles Synthesized by Coprecipitation Method

7th Nanoscience and Nanotechnology Symposium

物理学;材料科学

Daratika, D.A.^1 ; Saiyasombat, C.^2 ; Kamonsuangkasem, K.^2 ; Baqiya, M.A.^1 ; Darminto^1

Department of Physics, Institut Teknologi Sepuluh Nopember (ITS), ITS Campus Keputih-Sukolilo, Surabaya

60111, Indonesia^1

Synchrotron Light Research Institute, 111 University Avenue, Nakhon Ratchasima, Muang District

3000, Thailand^2

关键词: Coprecipitation method;    Crystal size;    Cu concentrations;    Cu-doping;    Electrical conductivity;    MAUD software;    Oxidation state;    X-ray absorption near edge spectroscopy;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/395/1/012002/pdf
DOI  :  10.1088/1757-899X/395/1/012002

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Copper-doped ZnO (CZO) nanoparticles have successfully been synthesized by coprecipitation method with Cu concentrations ranging from 0 to 5 wt%. The effect of Cu concentration on electrical properties and the oxidation state of ZnO were investigated. The x-ray diffraction (XRD) pattern analysis shows CZO phase formed with calcination at 400°C for 3 h. The crystal size of CZO nanoparticles, evaluated using MAUD software, is in the range of 56 - 90 nm. It was obtained that the Cu doping has reduced the optical band gap from 2.85 eV to 3.06 eV, while the electrical conductivity increased from 1.03 x 10-8 to 24.25 x 10-8 S/cm. The highest conductivity of CZO is achieved by the sample doped with 4 wt% Cu. This result has been further studied by the x-ray absorption near edge spectroscopy (XANES) measurement at Cu K-edge related to the oxidation state of the Cu ions substituting Zn sites.