Photopyroelectric spectroscopy incorporating surface plasmon amplification for the development of chemical sensors using selective surfaces of nanometer thickness
| Autor: | Ulrich J. Krull, L. Henke, R. F. Debono, M. S. Heimlich |
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| Rok vydání: | 1995 |
| Předmět: | |
| Zdroj: | Ferroelectrics. 165:39-53 |
| ISSN: | 1563-5112 0015-0193 |
| DOI: | 10.1080/00150199508217251 |
| Popis: | The pyroelectric effect can be used to prepare a sensitive transducer for converting a thermal wave into an electrical signal. The thermal wave can be generated by a pulsed optical excitation and subsequent thermal relaxation of a chromophoric sample which is in thermal contact with the detector. Perturbation of the characteristic optical absorption spectrum of the chromophore by a selective chemical interaction can then be used to generate an analytical signal. The response time of such a chemical sensor decreases as the thickness of the surface chemistry is reduced. However, photopyroelectric (PPE) spectroscopy of monolayer and multilayer phenomena suffers from poor signal to noise characteristics due to the small quantities of chromophoric material available for thermal wave production. Surface plasmon resonance in rough silver films can be used to increase the electric field strength at the detector surface and provide intrinsic amplification of the PPE experiment. Placing a rough silver surface in a ... |
| Databáze: | OpenAIRE |
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