Detection of low-concentration heavy metal exploiting Tamm resonance in a porous TiO 2 photonic crystal.

Autor: Elsayed AM; TH-PPM Group, Physics Department, Faculty of Science, Beni-Suef University Beni-Suef 62514 Egypt arafaaly@aucegypt.edu arafa.hussien@science.bsu.edu.eg., Ahmed AM; Physics Department, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU) Riyadh 11623 Saudi Arabia.; Faculty of Science, Beni-Suef University Beni-Suef 62514 Egypt., Aly AH; TH-PPM Group, Physics Department, Faculty of Science, Beni-Suef University Beni-Suef 62514 Egypt arafaaly@aucegypt.edu arafa.hussien@science.bsu.edu.eg.; Department of Technical Sciences, Western Caspian University Baku 1001 Azerbaijan., Eissa MF; Faculty of Science, Beni-Suef University Beni-Suef 62514 Egypt., Tammam MT; Faculty of Science, Beni-Suef University Beni-Suef 62514 Egypt.
Jazyk: angličtina
Zdroj: RSC advances [RSC Adv] 2024 Aug 19; Vol. 14 (36), pp. 26050-26058. Date of Electronic Publication: 2024 Aug 19 (Print Publication: 2024).
DOI: 10.1039/d4ra05116e
Abstrakt: The detection of heavy metal ions, particularly Hg 2+ , has gained significant attention due to their severe adverse effects on human health and ecosystems. Conventional methods for monitoring these metals in freshwater often suffer from limitations in sensitivity, accuracy, and cost-effectiveness. This work introduces a novel heavy metal sensor based on Tamm resonance within a one-dimensional (1D) porous TiO 2 photonic crystal structure. The sensor design includes a prism, a silver (Ag) layer, a cavity, and a ternary multilayer porous TiO 2 layer. Reflectance spectra are analyzed using the transfer matrix method. A key aspect of this study is the optimization of sensor performance, which involves adjusting the thicknesses of all layers and the porosity of the multilayer porous TiO 2 . This optimization strategy is critical for achieving high sensitivity. The results demonstrate that the optimized sensor exhibits a high sensitivity of 0.045 nm ppm -1 for Hg 2+ solutions. This sensitivity arises from the effective integration of Tamm resonance with the properties of the porous TiO 2 photonic crystal. The proposed structure shows great potential for applications in heavy metal sensing, especially for detecting Hg 2+ ion contamination in drinking water with high sensitivity and accuracy. In addition to its high performance, the photonic crystal sensor offers extended lifetime, rapid measurement capabilities, cost-effectiveness, and potential for integration into compact devices, making it a promising solution for environmental monitoring and water quality assessment.
Competing Interests: There are no conflicts to declare.
(This journal is © The Royal Society of Chemistry.)
Databáze: MEDLINE
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