On the state of Mn in MnxZn1−xO nanoparticles and their surface modification with isonipecotic acid
| Autor: | M.F. Farías, Edilso Reguera, Jesús Díaz, M. P. Hernández, O. Estévez-Hernández, L. Jiménez-Hernández |
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| Rok vydání: | 2017 |
| Předmět: |
Chemistry
Nanoparticle 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Electronic Optical and Magnetic Materials Inorganic Chemistry chemistry.chemical_compound Crystallography X-ray photoelectron spectroscopy Transmission electron microscopy Materials Chemistry Ceramics and Composites Organic chemistry Carboxylate Isonipecotic acid Crystallite Physical and Theoretical Chemistry 0210 nano-technology Solid solution Wurtzite crystal structure |
| Zdroj: | Journal of Solid State Chemistry. 247:43-52 |
| ISSN: | 0022-4596 |
| DOI: | 10.1016/j.jssc.2016.12.022 |
| Popis: | Mn-doped ZnO (MnxZn1−xO) nanoparticles were synthesized by the co-precipitation method and coated with isonipecotic acid as capping ligand. The structure, composition and morphology of the resulting nanomaterial were investigated by energy disperse X-ray analysis, X-ray diffraction, and transmission electron microscopy data. Such measurements showed that the solid obtained contains 6 at% of Mn and it is formed by a highly crystalline material with 3–5 nm range of crystallite size, and only a small elongation of its cell parameter with respect to undoped ZnO wurtzite unit cell. Information on the state of manganese atom in the MnxZn1−xO nanostructures formed was obtained from X-ray photoelectron (XPS) and electron energy loss (EELS) spectroscopies. XPS and EELS spectra are composed of four peaks, corresponding to two species of Mn(II) and signals from Mn(III) and Mn(IV). Such spectral data on the state of Mn in the material studied is consistent with the mapping of Mn distribution observed in recorded transmission electron microscopy images, which reveal presence of clusters of Mn atoms. Only a fraction of doping Mn atoms were found forming a solid solution with the host ZnO structure. The functionalization of the nanoparticles system with Isonipecotic acid shows that this molecule remains anchored to the nanoparticles surface mainly through its N basic site. The availability of free carboxylate groups in the capping molecule was tested by conjugation to type IV horseradish peroxidase. |
| Databáze: | OpenAIRE |
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