Journal
IEEE SENSORS JOURNAL
Volume 20, Issue 14, Pages 7701-7710Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2020.2980388
Keywords
Copper; Optical sensors; Plasmons; Gold; Optical surface waves; Thin-film devices; optical transducers; copper thin-film; surface plasmon resonance spectroscopy; copper SPR sensor; optoelectronic devices
Funding
- Financiadora de Estudos e Projetos (FINEP)
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Universidade Federal Rural do Semi-Arido (UFERSA)
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The sensing properties of thin copper (Cu) films near the surface plasmon resonance (SPR), were re-evaluated for the metal-air and metal-water interfaces and compared with gold (Au) films. For this, we used three different SPR sensing designs, i.e., a prism-based set-up, an optical fiber-based system, and a grating coupler-based solution. Optimum SPR-excitation conditions are restricted to a Cu-metal film thickness of 45 +/- 5 nm for the ATR set-up in aqueous solution. The impacts of the surface Cu-oxide layer were discussed and prevented employing an Au ultra-thin protective overlayer. This strategy proved to be efficient for non-reversible binding. Cu-SPR responsivities are higher for the prism-based set-up (quite similar to Au-SPR ones) than the ones for the optical fiber-based system and a grating coupler-based solution. In contrast to thin Au films, bovine serum albumin (BSA) and other proteins do not bind irreversibly onto thin Cu-films. Our findings confirm the suitability of thin copper films for selected SPR sensing applications.
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