Structural Investigations of (Ni, Cu) Co–Doped ZnO Nanocrystals by X‐ray Absorption Spectroscopy. Issue 20 (28th May 2018)

• Record Type: Journal Article
• Authors: Tiwari, Nidhi; Kumar, Shiv; Kamal, Chinnathambi; Chakrabarti, Aparna; Prajapat, Champa Lal; Mishra, P. K.; Mondal, Pushpen; Jha, Sambhu Nath; Bhattacharyya, Dibyendu
• Is Part Of: ChemistrySelect. Volume 3:Issue 20(2018)
• Page Start: 5644
• Page End: 5651
• Publication Date: 2018-05-28
• Subjects: Dilute Magnetic Semiconductor -- EXAFS -- XANES; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.201800310
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: (Ni, Cu) co‐doped ZnO nanocrystals have been prepared through wet chemical route using nitrate based precursors and have been characterized thoroughly. Phase purity of the samples has been investigated by X‐ray diffraction (XRD) and Transmission Electron Microscopy (TEM) measurements. To have further micro structural insight, the samples have subsequently been subjected to synchrotron radiation based X‐ray absorption spectroscopy (XAS) measurements comprising of both X‐ray near edge structure (XANES) and Extended X‐ray Absorption Fine Structure (EXAFS) techniques. The results of the above measurements have been used to explain the magnetic properties of the samples which have further been corroborated by density functional theory (DFT) based electronic structure calculations. Abstract : Local structure measurements by EXAFS and XANES have been performed (Ni, Cu) co doped ZnO NCs to understand their magnetic behavior. XANES measurements show that there is CuO formation which causes AFM interaction in the samples resulting in reduction of magnetization up to 3% of Cu doping. However, magnetization in the sample again increases as the Cu doping concentration increases to 5% due to interaction between the TM ions mediated by Cu doping induced free charge carriers.