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a) b) J. Puiso et al. / Medical Physics in the Baltic States 7 (2009) 39 - 42 c) Fig. 3. Morphology of Ag/PVP nanocomposites after UV irradiation a) 1 min, b) 1+2 min and c) 1+4 min. According to [9] results, surface plasmonic properties (SPR resonance peak position, intensity in UV spectra) are dependent on the UV irradiation time of Ag/PVP layer. We found that the plasmonic properties of Ag/PVP layer after secondary UV are dependent on the sample’s history (as previous UV irradiation). The secondary UV irradiation induced the change of absorbance from 1.82 to 2.04 a.u. when the Ag/PVP 41 a) b) c) Fig. 4. Morphology of Ag/PVP nanocomposites after UV irradiation a) 2 min, b) 2+2 min and c) 2+4 min. layer was irradiating for 1 min. It could be mentioned that when the Ag/PVP layer was irradiated for 2 min the secondary UV irradiation induced the change of absorbance from 2.11 to 1.94 a.u. Redhift of SPR peak from 419 nm to 423 nm in UV-VIS spectra was induced by the secondary UV irradiation. It was observed only for the larger particles which were produced by primary UV exposure. We can say that at the first case (primary
J. Puiso et al. / Medical Physics in the Baltic States 7 (2009) 39 - 42 UV exposure was 1min) changes of absorbance were induced by silver photoreduction, at the second (primary UV exposure was 2 min) – by photodegradation of polymer and the third case (primary UV exposure was 3 min) – by silver nanoparticles agglomeration and polymer degradation. Morphology of Ag/PVP nanocomposites is presented in Fig 3 and Fig. 4 and Fig. 5. c) Fig. 5. Morphology of Ag/PVP nanocomposites after UV irradiation a) 4 min, b) 4+2 min and c) 4+4 min. We found that the main Ag/PVP nanocomposite layers structure is very flat 3D (islands) structure. Roughness (Rq) of these layers after primary UV irradiation varied a) b) 42 from 1.56 nm to 0.87 nm. The secondary UV irradiation induced changes in roughness and Ag/PVP morphology was very weak (0.2-0.4 nm). 4. Conclusions The influence of UV to plasmonic properties and morphology of Ag/PVP nanocomposites was absorbed at very short UV irradiation time from 1 min to 7 min. was investigated. Intensity and position of the surface plasmon resonance of Ag/PVP are dependent on the UV irradiation time also on type of UV irradiation (primary or secondary). Changes of plasmonic properties of Ag/PVP layers are challenge for new personal UV dosimeters. We suggest that detectors based on surface plasmon resonance become a useful tool in both clinical and scientific areas. 5 Acknowledgements The Lithuanian Science and Study Foundation and COST action MP0803 have supported this work. 6. References 1. S. T. Durant, K. Paffet, M. Shrivastav, G. S. Timmins, W. F. Morgan, and J. A. Nickoloff, UV Radiation Induces Delayed Hyperrecombination Associated with Hypermutation in Human cells,.- Molecular and cellular biology 26, No 16, 2006, 6047-6055p. 2. P. Hoeppe, A. Oppenrieder, C. Erianto, K. Koepke, J. Reuder, M. Seefeldner, D. Nowak, Visualization of UV exposure of the human body based on data from a scaning UV- measuring system, Int. J. Biometerol 49, 2004, 18-25 p. 3. Y. Furusawa, K. Suzuki and M. Sasaki, Biological and Physical deosimeters for monitoring Solar UV-B light, J. Radiat. Res. 31, 1990, 189-206 p. 4. Parisi, A.V., Wong, C.F., Galea, V. A study of the total ultraviolet exposure to all the leaves for small plant growth. J. Photochem. Photobiol. B: Biol., 45, 1998, 36-42 p. 5. Parisi, A.V., Kimlin, M.G, Personal solar UV exposure measurements employing polysulphone with an extended dynamic range. Photochem. Photobiol., 79, 2004, 411-416p. . 6. Stepanov, A.L. Quantitative analysis of surface plasmon interaction with silver nanoparticles.- Optics Letters 30, No. 12, 2005, 1524-1526 p. 7. Choi N.K., Seo D. S,. Lee J.K, Preparation and stabilization of silver colloids protected by surfactant.- Materials forum, 29, 2005, 394-397 p. 8. Carotenuto G., Pepe G.P., and Nicolais L., Preparation and characterization of nano-sized Ag/PVP composites for optical applications.- Eur. Phys. J. B16, 2006 11-17 p. 9. Yang X., Lu Y., Preparation of polypyrrole-coated silver nanoparticles by one-step UV-induced polymerization Materials Letters, 59 2005: pp. 2484- 2487p. 10. Evanoff Jr D.D., Chumanov G. Synthesis and optical properties of silver nanoparticles and arrays. J. Phys. Chem 108 2004 13948-13956p.
Page 1 and 2: 2009 PROCEEDINGS OF THE 7 th INTERN
Page 3 and 4: Executive editor: D.Adlienė CONFER
Page 5 and 6: 11.15-11.30 Daiva Leščiute, Valda
Page 7 and 8: MEDICAL PHYSICS IN THE BALTIC STATE
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Page 75 and 76: Scatter dose ( Gy /mA s) 1.55E-12 1
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MEDICAL PHYSICS IN THE BALTIC STATE
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M. Pučetaitė et al. / Medical Phy
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D. Adlienė et al. / Medical Physic
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MP Competences Generic Competences
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S. Tabakov et al. / Medical Physics
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J. Laurikaitienė et al. / Medical
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R, % 100,0 99,5 99,0 98,5 98,0 97,5
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