Kim, Sang Woo Hui, Bang Jae Bae, Dong-Sik 2024-01-21T00:00:53Z 2024-01-21T00:00:53Z 2021-09-03 2008-02 1533-4880 https://pubs.kist.re.kr/handle/201004/133783 Anomalous absorption of isolated silver nanoparticulate films with different morphological patterns prepared by the wet colloidal route and followed by thermal treatment were investigated. A polymer embedded silver nanoparticulate film thermally treated at 200 degrees C showed maximum absorbance at similar to 412 nm. The peak position of the surface plasmon band was slightly different but still consistent with theoretical prediction derived by the Mie theory. An isolated nanopariculate film thermally treated at 300 degrees C showed anomalous absorption. Its maximum absorption band was shifted to green regime of 506.9 nm and the bandwidth at half-maximum absorbance of the surface plasmon band was greatly broadened. The plasmon band and its bandwidth were much deviated compared to the theoretical prediction calculated for the silver nanoparticles in the surrounding medium of air and poly(vinyl pyrrolidone) or socla-lime-silica glass. Even though there was no significant growth of silver nanoparticles during thermal treatment at 300 degrees C, the anomalous absorption was observed. The anomalous absorption was not attributed to effects of particle shape and size but to effects of pores induced by development of a great number of pores in the nanoparticulate film. The anomalous absorption greatly decreased with increase in heating temperature from 400 degrees C to 500 degrees C. The extraordinary plasmon damping of the isolated film decreased and the plasmon absorption band was re-shifted to violet regime of 416 nm because of large decrease in size of particles with dramatic change of pore morphology from circular pores with rim to small continuous pores induced by spontaneous formation of new silver nanoparticles. English AMER SCIENTIFIC PUBLISHERS OPTICAL-ABSORPTION DIELECTRIC-CONSTANT GOLD PARTICLES THIN-FILMS SPECTRA COLLOIDS Anomalous absorption of isolated silver nanoparticulate films in visible region of electromagnetic field Article 10.1166/jnn.2008.D252 1 JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.8, no.2, pp.739 - 744 JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 8 2 739 744 scie scopus 000254083700042 2-s2.0-42549148506 Chemistry, Multidisciplinary Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article; Proceedings Paper OPTICAL-ABSORPTION DIELECTRIC-CONSTANT GOLD PARTICLES THIN-FILMS SPECTRA COLLOIDS optical properties surface plasmon band nanoparticles metal film silve