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Ion-Imprinted Chitosan-Based Localized Surface Plasmon Resonance Sensor for Ni(2+) Detection
Heavy metals are important sources of environmental pollution and cause disease in organisms throughout the food chain. A localized surface plasmon resonance sensor was proposed and demonstrated to realize Ni(2+) detection by using ion-imprinted chitosan. Au nanoparticles were coated on the multimod...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9694492/ https://www.ncbi.nlm.nih.gov/pubmed/36433601 http://dx.doi.org/10.3390/s22229005 |
Sumario: | Heavy metals are important sources of environmental pollution and cause disease in organisms throughout the food chain. A localized surface plasmon resonance sensor was proposed and demonstrated to realize Ni(2+) detection by using ion-imprinted chitosan. Au nanoparticles were coated on the multimode fiber to excite the local surface plasmon resonance, and Ni(2+)-imprinted chitosan was then functionalized by using the dip coating technique. Ethylene diamine tetra-acetic acid was used to release the Ni(2+) ions and hence form countless voids. Ni(2+) was refilled into the voids to increase the refractive index of the sensing material, thus realizing the measurement of Ni(2+) by monitoring the wavelength shift in the localized surface plasmon resonant peak. The coating thickness of the Ni(2+)–chitosan gel was optimized to obtain greater sensitivity. Experimental results show that the proposed Ni(2+) sensor has a sensitivity of 185 pm/μM, and the limit of detection is 0.512 μM. The comparison experiments indicated that the ion-imprinted chitosan has better selectivity than pure chitosan. |
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