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<p>In this work, we report the first synthesis of a SnSe/MWCNT/Fullerene ternary nanocomposite via a facile combination of hydrothermal crystallization and mechanical mixing, yielding a well-dispersed network of few-layer SnSe nanosheets intertwined with multi-walled carbon nanotubes and C<sub>60</sub> nanoparticles. Structural characterization (XRD, FT-IR, FE-SEM) confirms the retention of SnSe’s orthorhombic phase alongside clear signatures of graphite and face-centered-cubic C<sub>60</sub>, while cyclic voltammetry and electrochemical impedance spectroscopy demonstrate that the optimal composition (SnSe<sub>0.92</sub>/MWCNT<sub>0.05</sub>/Fullerene<sub>0.03</sub>) achieves a charge transfer resistance as low as ≈ 40 Ω and peak current densities nearly twice those of binary or undoped SnSe analogues. In differential pulse voltammetry, this S4 electrode exhibits a linear Pb<sup>2</sup>⁺ sensing range up to 10&#xa0;mM (<i>R</i><sup>2</sup> = 0.969), a limit of detection of 42.94&#xa0;µM, and a limit of quantification of 14.17&#xa0;µM, with excellent reproducibility (RSD = 1.36%) and stability over four weeks. Under UV–visible irradiation, S4 displays outstanding photocatalytic performance for Rhodamine B degradation: an optimal catalyst loading of 30&#xa0;mg in 5&#xa0;mL of 10&#xa0;ppm dye yields 92.88% removal in 210&#xa0;min, and tuning the solution pH to 11 boosts decolorization to 99.60%. The synergistic interplay between SnSe’s narrow, tunable bandgap (1.2–2.8&#xa0;eV) and Fullerene’s high electron affinity sharply suppresses electron–hole recombination, while MWCNTs furnish robust electron-transport pathways-together delivering a multifunctional material that simultaneously excels as an electrochemical sensor and a visible-light-driven photocatalyst.</p>

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Electrochemical studies on tin selenide and fullerene decorated MWCNTs for sensor and dye degradation applications

  • 期刊论文

  • 发表日期：

    2025年6月6日

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  • H. L. Sandeep,
  • B. L. Suresha,
  • S. R. Yashodha,
  • Amnah Mohammed Alsuhaibani,
  • Moamen S. Refat

摘要

In this work, we report the first synthesis of a SnSe/MWCNT/Fullerene ternary nanocomposite via a facile combination of hydrothermal crystallization and mechanical mixing, yielding a well-dispersed network of few-layer SnSe nanosheets intertwined with multi-walled carbon nanotubes and C60 nanoparticles. Structural characterization (XRD, FT-IR, FE-SEM) confirms the retention of SnSe’s orthorhombic phase alongside clear signatures of graphite and face-centered-cubic C60, while cyclic voltammetry and electrochemical impedance spectroscopy demonstrate that the optimal composition (SnSe0.92/MWCNT0.05/Fullerene0.03) achieves a charge transfer resistance as low as ≈ 40 Ω and peak current densities nearly twice those of binary or undoped SnSe analogues. In differential pulse voltammetry, this S4 electrode exhibits a linear Pb2⁺ sensing range up to 10 mM (R2 = 0.969), a limit of detection of 42.94 µM, and a limit of quantification of 14.17 µM, with excellent reproducibility (RSD = 1.36%) and stability over four weeks. Under UV–visible irradiation, S4 displays outstanding photocatalytic performance for Rhodamine B degradation: an optimal catalyst loading of 30 mg in 5 mL of 10 ppm dye yields 92.88% removal in 210 min, and tuning the solution pH to 11 boosts decolorization to 99.60%. The synergistic interplay between SnSe’s narrow, tunable bandgap (1.2–2.8 eV) and Fullerene’s high electron affinity sharply suppresses electron–hole recombination, while MWCNTs furnish robust electron-transport pathways-together delivering a multifunctional material that simultaneously excels as an electrochemical sensor and a visible-light-driven photocatalyst.