A dual-channel optical fiber sensor based on surface plasmon resonance for heavy metal ions detection in contaminated water

Multichannel Fiber Optic SPR Sensors: Realization Methods, Application Status, and Future Prospects

“…[143] Similarly, the core mode of the TFBG-SPR sensor possesses the capability of compensating for temperature fluctuations. When the concentration of dopamine is in the range of 10 −13 -10 −8 m, the sensitivity of the sensor reaches 0.29 dB log −1 [190] Copyright 2020, Elsevier. Reproduced with permission.…”

“…After that, Zhang et al employed an MC-SPR sensor with the cascaded structure to detect heavy metal ions in the solution. [190] The reference channel is only based on the silver film of different thicknesses, while the sensing channel uses chitosan and PAA as sensitive materials. The results are displayed in Figure 36b: the response in sensing channel to Cu 2+ ions is significantly higher than that of other ions, while the wavelength shift of the reference channel is small, which proves that the sensing channel can specifically detect low concentrations of Cu 2+ ions, and even the concentration can hardly change the RI of the solution.…”

“…d) Cross-sectional schematic diagram of methane and strain dual-parameter SPR sensor based on LPG and SPR. Reproduced with permission [190]. Copyright 2020, Elsevier.…”

Metal Discovery by Highly Sensitive Microwave Multi-Band Metamaterial-Inspired Sensors

“…Most existing metal sensors are based on the chemical and optical properties of metal substances [1][2][3][4][5][6][7][8][9][10][11][12], concentrating on the reaction between the substance atoms and catalysts [1,3,7], or light excitation [8][9][10][11][12]. Electroreduction from acids (AuCl 4 and [PdCl 4 ] 2 ) was used for recovering gold (Au) and palladium (Pd) [1].…”

“…Surface plasmon, the collective charge oscillations, that occur at the interface between conductors and environment, are mainly used in optical metal sensors. An optical fiber sensor based on surface plasmon resonance for Ag in water contamination generated two resonances between 400 and 500 THz, for thickness of 2540 nm [8]. A quartz crystal microbalance was tested for gold ions with thickness varying from 0 to 100 µm, where a resonance near 650 nm was found [9].…”