Morphology-sensitive infrared absorption bands of polymers derived from surface polaritons
Infrared (IR) spectroscopy is mostly used for analysis of normal modes, which provides rich chemical information of molecular structure at each chemical group. In practice, however, we sometimes encounter an unusually broad peak that cannot be assigned to a normal mode or overlapped multiple normal...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2019-10-01
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| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/1.5116280 |
| _version_ | 1811335678416388096 |
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| author | Naoto Nagai Hideki Okada Takeshi Hasegawa |
| author_facet | Naoto Nagai Hideki Okada Takeshi Hasegawa |
| author_sort | Naoto Nagai |
| collection | DOAJ |
| description | Infrared (IR) spectroscopy is mostly used for analysis of normal modes, which provides rich chemical information of molecular structure at each chemical group. In practice, however, we sometimes encounter an unusually broad peak that cannot be assigned to a normal mode or overlapped multiple normal modes. This unusual peak can readily be understood by taking the concept of polariton into account even for a polymeric material. In general, however, ‘polariton’ is used for discussing inorganic crystals, in which the real part of the relative permittivity falls in negative. Here, we show some polymeric materials exhibit apparent negative relative permittivity in an IR region, which yields the unusual peaks. Through the measurements and theoretical simulations of spectra of polymer thin films, polariton is found to be necessary to comprehensively understand IR spectra of a polymer not only for a thin film, but also for powder dispersed in a KBr pellet, since the polariton peaks are found to be deeply correlated with the surface morphology. |
| first_indexed | 2024-04-13T17:27:49Z |
| format | Article |
| id | doaj.art-63efdf109f894e2aadeff73593b49d85 |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-04-13T17:27:49Z |
| publishDate | 2019-10-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-63efdf109f894e2aadeff73593b49d852022-12-22T02:37:41ZengAIP Publishing LLCAIP Advances2158-32262019-10-01910105203105203-1210.1063/1.5116280023910ADVMorphology-sensitive infrared absorption bands of polymers derived from surface polaritonsNaoto Nagai0Hideki Okada1Takeshi Hasegawa2Industrial Research Institute of Niigata Prefecture, 1-11-1 Abumi Nishi, Niigata 950-0915, JapanIndustrial Research Institute of Niigata Prefecture, 1-11-1 Abumi Nishi, Niigata 950-0915, JapanInstitute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, JapanInfrared (IR) spectroscopy is mostly used for analysis of normal modes, which provides rich chemical information of molecular structure at each chemical group. In practice, however, we sometimes encounter an unusually broad peak that cannot be assigned to a normal mode or overlapped multiple normal modes. This unusual peak can readily be understood by taking the concept of polariton into account even for a polymeric material. In general, however, ‘polariton’ is used for discussing inorganic crystals, in which the real part of the relative permittivity falls in negative. Here, we show some polymeric materials exhibit apparent negative relative permittivity in an IR region, which yields the unusual peaks. Through the measurements and theoretical simulations of spectra of polymer thin films, polariton is found to be necessary to comprehensively understand IR spectra of a polymer not only for a thin film, but also for powder dispersed in a KBr pellet, since the polariton peaks are found to be deeply correlated with the surface morphology.http://dx.doi.org/10.1063/1.5116280 |
| spellingShingle | Naoto Nagai Hideki Okada Takeshi Hasegawa Morphology-sensitive infrared absorption bands of polymers derived from surface polaritons AIP Advances |
| title | Morphology-sensitive infrared absorption bands of polymers derived from surface polaritons |
| title_full | Morphology-sensitive infrared absorption bands of polymers derived from surface polaritons |
| title_fullStr | Morphology-sensitive infrared absorption bands of polymers derived from surface polaritons |
| title_full_unstemmed | Morphology-sensitive infrared absorption bands of polymers derived from surface polaritons |
| title_short | Morphology-sensitive infrared absorption bands of polymers derived from surface polaritons |
| title_sort | morphology sensitive infrared absorption bands of polymers derived from surface polaritons |
| url | http://dx.doi.org/10.1063/1.5116280 |
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