Radiolytic synthesis and characterization of PVA/Au nanocomposites: The influence of pH values
Nanocomposites which consist of polymer matrix and nanoparticles of noble metal are a very important class of nanomaterials. The optical properties of these materials are strongly dependent on the nanoparticles size as well as on the synthesized procedure of nanocomposites preparation. In this work...
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| Format: | Article |
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Association of Chemical Engineers of Serbia
2008-01-01
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| Series: | Hemijska Industrija |
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| Online Access: | http://www.doiserbia.nb.rs/img/doi/0367-598X/2008/0367-598X0803101K.pdf |
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| author | Krklješ Aleksandra N. Mitrić Miodrag Kačarević-Popović Zorica M. |
| author_facet | Krklješ Aleksandra N. Mitrić Miodrag Kačarević-Popović Zorica M. |
| author_sort | Krklješ Aleksandra N. |
| collection | DOAJ |
| description | Nanocomposites which consist of polymer matrix and nanoparticles of noble metal are a very important class of nanomaterials. The optical properties of these materials are strongly dependent on the nanoparticles size as well as on the synthesized procedure of nanocomposites preparation. In this work the Au nanoparticles were synthesized by the simple radiolytic procedure, using steady state gamma irradiation, under different pH values. PVA/Au nanocomposite films were obtained by solvent evaporation from Au colloids. UV-Vis absorption spectra of Au colloids show absorption in the range of 450 to 650 nm with the maximum around 520 nm, which is the typical plasmon band of Au nanoparticles. Absorption spectra of PVA/Au nanocomposites are red shifted compared to corresponding primary Au colloids. This red shift is not result of any change in particle size distribution and can be explained by the change of dielectric property of surrounding medium. IR spectra indicated anchoring the OH groups of PVA molecule at the cluster surface. This effect limits the growing of the metal clusters and confirmed that the PVA is a god matrix for in situ synthesis of Au nanoparticles. The size of Au nanoparticles is dependent on the experimental conditions. Obtained results indicated that the pH value of solution played an important role. The values of absorption maximum (λmax) were not dependent on the concentration of Au cations, but show strong dependence on the pH value of the initial solution. The increase of pH value reduced the mean diameters of nanoparticles. The lowest value of λmax was obtained for colloid with pH 7, which theoretically corresponds to the nanoparticles with minimum dimension. These results are in agreement with the XRD measurement of PVA/Au nanocomposite films and theoretical calculations. According to obtained results of radiolytic synthesis of Au nanoparticles in PVA solution can be conclude that it is possible to control the particle size by tuning the pH value of solution. |
| first_indexed | 2024-12-13T17:31:32Z |
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| institution | Directory Open Access Journal |
| issn | 0367-598X |
| language | English |
| last_indexed | 2024-12-13T17:31:32Z |
| publishDate | 2008-01-01 |
| publisher | Association of Chemical Engineers of Serbia |
| record_format | Article |
| series | Hemijska Industrija |
| spelling | doaj.art-6387619ae22e4ebabd9657805b33cd752022-12-21T23:37:01ZengAssociation of Chemical Engineers of SerbiaHemijska Industrija0367-598X2008-01-0162310110610.2298/HEMIND0803101KRadiolytic synthesis and characterization of PVA/Au nanocomposites: The influence of pH valuesKrklješ Aleksandra N.Mitrić MiodragKačarević-Popović Zorica M.Nanocomposites which consist of polymer matrix and nanoparticles of noble metal are a very important class of nanomaterials. The optical properties of these materials are strongly dependent on the nanoparticles size as well as on the synthesized procedure of nanocomposites preparation. In this work the Au nanoparticles were synthesized by the simple radiolytic procedure, using steady state gamma irradiation, under different pH values. PVA/Au nanocomposite films were obtained by solvent evaporation from Au colloids. UV-Vis absorption spectra of Au colloids show absorption in the range of 450 to 650 nm with the maximum around 520 nm, which is the typical plasmon band of Au nanoparticles. Absorption spectra of PVA/Au nanocomposites are red shifted compared to corresponding primary Au colloids. This red shift is not result of any change in particle size distribution and can be explained by the change of dielectric property of surrounding medium. IR spectra indicated anchoring the OH groups of PVA molecule at the cluster surface. This effect limits the growing of the metal clusters and confirmed that the PVA is a god matrix for in situ synthesis of Au nanoparticles. The size of Au nanoparticles is dependent on the experimental conditions. Obtained results indicated that the pH value of solution played an important role. The values of absorption maximum (λmax) were not dependent on the concentration of Au cations, but show strong dependence on the pH value of the initial solution. The increase of pH value reduced the mean diameters of nanoparticles. The lowest value of λmax was obtained for colloid with pH 7, which theoretically corresponds to the nanoparticles with minimum dimension. These results are in agreement with the XRD measurement of PVA/Au nanocomposite films and theoretical calculations. According to obtained results of radiolytic synthesis of Au nanoparticles in PVA solution can be conclude that it is possible to control the particle size by tuning the pH value of solution.http://www.doiserbia.nb.rs/img/doi/0367-598X/2008/0367-598X0803101K.pdfradiolytic synthesisPVA/Au nanocompositespH values |
| spellingShingle | Krklješ Aleksandra N. Mitrić Miodrag Kačarević-Popović Zorica M. Radiolytic synthesis and characterization of PVA/Au nanocomposites: The influence of pH values Hemijska Industrija radiolytic synthesis PVA/Au nanocomposites pH values |
| title | Radiolytic synthesis and characterization of PVA/Au nanocomposites: The influence of pH values |
| title_full | Radiolytic synthesis and characterization of PVA/Au nanocomposites: The influence of pH values |
| title_fullStr | Radiolytic synthesis and characterization of PVA/Au nanocomposites: The influence of pH values |
| title_full_unstemmed | Radiolytic synthesis and characterization of PVA/Au nanocomposites: The influence of pH values |
| title_short | Radiolytic synthesis and characterization of PVA/Au nanocomposites: The influence of pH values |
| title_sort | radiolytic synthesis and characterization of pva au nanocomposites the influence of ph values |
| topic | radiolytic synthesis PVA/Au nanocomposites pH values |
| url | http://www.doiserbia.nb.rs/img/doi/0367-598X/2008/0367-598X0803101K.pdf |
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