Surface Plasmon Resonance Sensing Characteristics of Thin Copper and Gold Films in Aqueous and Gaseous Interfaces

Rodrigues, Eloise P.; Oliveira, Leiva Casemiro; Silva, Maria L. F.; Moreira, Cleumar S.; Lima, A.M.N.

doi:10.1109/jsen.2020.2980388

Cited by 22 publications

(16 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The optimal copper thickness (around 50 nm) is coherent with that found in Reference [9] (45 ± 5 nm), even if the substrate (prism) and the wavelength were not the same. However, these results show that more than one copper thickness may be used to design an efficient SPR sensor.…”

Section: Cu-oxide-spr Performancesupporting

confidence: 84%

“…The basics of SPR are given in Reference [25]. In that reference, we gave the conditions of SPR excitation on an interface between two mediums and the corresponding formula, also used in [9]. Considering a plane interface between two media (one of them is a metal), the SPR angle can be easily evaluated, n 2 i and n 2 j being the relative permittivities of materials on both sides of the interface, and n 2 g being that of the hemispherical glass substrate, and the real part:…”

Section: The Spr Modelmentioning

confidence: 99%

“…We consider the angle interrogation mode of the SPR sensor [2,9,12]. At a given wavelength, in the Angular Interrogation Mode (AIM), with a changing refractive index of water (upper medium, analyte), the resonance angle shifts [4].…”

Section: The Spr Modelmentioning

confidence: 99%

“…In addition to its non-toxic nature, the oxide layer can be used to tune the position of the SPR resonance [9]. Indeed, the oxide layer could be used to adjust the resonance near the copper transition 2.1 eV that is characteristic of the inter-band transition from d states (valence band) to the 's-p' conduction band [18] (Figures A1, A7 and A11 where the vertical line shows the photon energy of illumination used in the SPR setup E = 1.96 eV).…”

Section: Cu-oxide-spr Performancementioning

confidence: 99%

“…Copper presents interesting properties for optics, nanotechnology [5][6][7] and, therefore, for SPR sensors [8][9][10]. A recent paper demonstrated that the performance of a Cu-SPR sensor is quite similar to Au-SPR ones [9]. Moreover, bovine serum albumin (BSA) and other proteins do not bind irreversibly onto thin Cu-films.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Performance of Surface Plasmon Resonance Sensors Using Copper/Copper Oxide Films: Influence of Thicknesses and Optical Properties

et al. 2022

View full text Add to dashboard Cite

Surface plasmon resonance sensors (SPR) using copper for sensitive parts are a competitive alternative to gold and silver. Copper oxide is a semiconductor and has a non-toxic nature. The unavoidable presence of copper oxide may be of interest as it is non-toxic, but it modifies the condition of resonance and the performance of the sensor. Therefore, the characterization of the optical properties of copper and copper oxide thin films is of interest. We propose a method to recover both the thicknesses and optical properties of copper and copper oxide from absorbance curves over the (0.9;3.5) eV range, and we use these results to numerically investigate the surface plasmon resonance of copper/copper oxide thin films. Samples of initial copper thicknesses 10, 30 and 50 nm, after nine successive oxidations, are systematically studied to simulate the signal of a Surface Plasmon Resonance setup. The results obtained from the resolution of the inverse problem of absorbance are used to discuss the performance of a copper-oxide sensor and, therefore, to evaluate the optimal thicknesses.

show abstract

Section: Cu-oxide-spr Performancesupporting

confidence: 84%

Section: The Spr Modelmentioning

confidence: 99%