Cellulose and Vanadium Plasmonic Sensor to Measure Ni2+ Ions

A novel vanadium-cellulose composite thin film-based on angular interrogation surface plasmon resonance (SPR) sensor for ppb-level detection of Ni(II) ion was developed. Experimental results show that the sensor has a linear response to the Ni(II) ion concentrations in the range of 2-50 ppb with a determination coefficient (R-2) of 0.9910. This SPR sensor can attain a maximum sensitivity (0.068 degrees ppb(-1)), binding affinity constant (1.819 x 10(6) M-1), detection accuracy (0.3034 degree(-1)), and signal-to-noise-ratio (0.0276) for Ni(II) ion detection. The optical properties of thin-film targeting Ni(II) ions in different concentrations were obtained by fitting the SPR reflectance curves using the WinSpall program. All in all, the proposed Au/MPA/V-CNCs-CTA thin-film-based surface plasmon resonance sensor exhibits better sensing performance than the previous film-based sensor and demonstrates a wide and promising technology candidate for environmental monitoring applications in the future.