Visible wavelength interrogation of Kretschmann based SPR spectroscopy using polymeric ZnO quantum Dot layer for chloride detection

IF 4.3 2区化学 Q1 SPECTROSCOPY

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy Pub Date : 2025-02-12 DOI:10.1016/j.saa.2025.125872

Mohd Hafiz Abu Bakar , Muhammad Qayyum Othman , Nur Hidayah Azeman , Nadhratun Naiim Mobarak , Wan Mohd Ebtisyam Mustaqim Mohd Daniyal , Fairuz Abdullah , Ahmad Ashrif A Bakar

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Abstract

Applying visible-wavelength interrogation Kretschmann SPR spectroscopy technique using a polymeric ZnO-Quantum Dot PVA (pZnOQD) layer for chloride ion detection represents a significant advancement in photonic technology. This method streamlines the detection process while maintaining high sensitivity. Molecular analysis reveals subtle shifts in specific peaks of the ZnOQD spectrum after the interaction, suggesting chloride ion interaction with the active layer. Subsequent SPR analysis confirms these findings, showing wavelength shifts in SPR peaks between 630 – 660 nm across different chloride ion concentrations. This technique demonstrates exceptional sensitivity, detecting chloride ion concentrations from 1.0 to 20.0 ppm, with two distinct sensitivity ranges (1.0 – 4.0 ppm and 4.0 – 20.0 ppm) and corresponding values of 1.7221 (R² = 0.998) and 0.627 nm/ppm (R² = 0.992), respectively. These results are comparable, with a low detection limit of 0.3 ppm. Experimental data fitting well with the Sips model yields an R² value of 0.995 and a binding affinity of 3.876 × 10²M⁻¹, providing valuable insights for sensor development. This integrated analysis provides a comprehensive understanding of chloride ion interactions with the pZnOQD sensing layer, paving the way for advanced optical spectroscopy using quantum dots.

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来源期刊

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 物理-光谱学

CiteScore

8.40

自引率

11.40%

发文量

1364

审稿时长

40 days

期刊介绍： Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy (SAA) is an interdisciplinary journal which spans from basic to applied aspects of optical spectroscopy in chemistry, medicine, biology, and materials science. The journal publishes original scientific papers that feature high-quality spectroscopic data and analysis. From the broad range of optical spectroscopies, the emphasis is on electronic, vibrational or rotational spectra of molecules, rather than on spectroscopy based on magnetic moments. Criteria for publication in SAA are novelty, uniqueness, and outstanding quality. Routine applications of spectroscopic techniques and computational methods are not appropriate. Topics of particular interest of Spectrochimica Acta Part A include, but are not limited to: Spectroscopy and dynamics of bioanalytical, biomedical, environmental, and atmospheric sciences, Novel experimental techniques or instrumentation for molecular spectroscopy, Novel theoretical and computational methods, Novel applications in photochemistry and photobiology, Novel interpretational approaches as well as advances in data analysis based on electronic or vibrational spectroscopy.