Hydrogen sensing via anomalous optical absorption of palladium-based metamaterials
| Autor: | J. L. Santos, J. M. Teixeira, Ariel Guerreiro, Pedro Rocha-Rodrigues, João P. Araújo, Paulo Rodrigues Fernandes, Aurelio Hierro-Rodriguez, Pedro A. S. Jorge, Ivo T. Leite |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Nanostructure
Materials science Hydrogen Physics::Optics chemistry.chemical_element Bioengineering 02 engineering and technology 01 natural sciences Homogenization (chemistry) Optics Hydrogen economy General Materials Science Electrical and Electronic Engineering Thin film Atmospheric pressure business.industry Mechanical Engineering 010401 analytical chemistry Metamaterial General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry Mechanics of Materials Optoelectronics 0210 nano-technology business Palladium |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| Popis: | A palladium (Pd)-based optical metamaterial has been designed, fabricated and characterized for its application in hydrogen sensing. The metamaterial can replace Pd thin films in optical transmission schemes for sensing with performances far superior to those of conventional sensors. This artificial material consists of a palladium-alumina metamaterial fabricated using inexpensive and industrial-friendly bottom-up techniques. During the exposure to hydrogen, the system exhibits anomalous optical absorption when compared to the well-known response of Pd thin films, this phenomenon being the key factor for the sensor sensitivity. The exposure to hydrogen produces a large variation in the light transmission through the metamembrane (more than 30% with 4% in volume hydrogen-nitrogen gas mixture at room temperature and atmospheric pressure), thus avoiding the need for sophisticated optical detection systems. An optical homogenization model is proposed to explain the metamaterial response. These results contribute to the development of reliable and low-cost hydrogen sensors with potential applications in the hydrogen economy and industrial processes to name a few, and also open the door to optically study the hydrogen diffusion processes in Pd nanostructures. |
| Databáze: | OpenAIRE |
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