Structural Characteristics and Bonding Environment of Ag Nanoparticles Synthesized by Gamma Irradiation Within Thermo-Responsive Poly(N-isopropylacrylamide) Hydrogel
| Autor: | Miodrag Mitrić, Zlatko Rakočević, Jelena Krstić, Maja Popović, Melina Kalagasidis-Krušić, Zorica Kačarević-Popović, Aleksandra Radosavljević, Jelena Spasojević |
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| Rok vydání: | 2017 |
| Předmět: |
chemistry.chemical_classification
Materials science Polymers and Plastics Nanoparticle Nanotechnology 02 engineering and technology General Chemistry Nanoreactor Polymer 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Silver nanoparticle 0104 chemical sciences chemistry.chemical_compound Lattice constant X-ray photoelectron spectroscopy chemistry Chemical engineering Materials Chemistry Ceramics and Composites Poly(N-isopropylacrylamide) Texture (crystalline) Composite material 0210 nano-technology |
| Zdroj: | Polymer Composites |
| Popis: | To produce well-defined metal clusters stabilized in protective matrix, poly(N-isopropylacrylamide) (PNiPAAm) hydrogel with different initial concentration of polymer was used as nanoreactor. The in situ synthesis of well dispersed silver nanoparticles (AgNPs) was performed by gamma irradiation. The obtained AgNPs are spherical in shape with the diameter less than 20 nm. Crystalline properties of nanoparticles such as size, texture coefficient, strain, stress, lattice parameter, d-spacing, and dislocation density have been calculated using XRD data. Results confirm that the changes of lattice parameter of crystalline AgNPs sensitively reflect their state of strain and stress depending on the formation conditions (i.e., on the concentration of PNiPAAm) and on the diameter of AgNPs. The negative lattice strain and compression stress were observed for the smaller AgNPs (lattice contraction), while for the larger AgNPs are positively strained and under tensile stress (lattice expansion). XPS spectra revealed the donor-acceptor type of interaction between carbonyl oxygen from PNiPAAm and AgNPs (positive shift of high BE component of O 1s and negative shift of Ag 3d BE). The greater dislocation density of smaller AgNPs incorporated in more concentrated PNiPAAm, resulted in more binding sites and stronger interaction with polymer. POLYM. COMPOS., 2015. © 2015 Society of Plastics Engineers |
| Databáze: | OpenAIRE |
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