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<p>A tri-phase nanomaterial composed of AgBiS<sub>2</sub>, Bi<sub>2</sub>S<sub>3</sub>, and Ag<sub>2</sub>S was formed during the hydrothermal synthesis of AgBiS<sub>2</sub>. Structural, optical, and electrical properties of this tri-phase are studied. X-ray diffraction (XRD) analysis of the observed peaks confirmed the formation of a tri-phase state. Field emission scanning electron microscopy (FESEM) displayed spherical agglomerates at a 200&#xa0;nm scale, and energy-dispersive X-ray spectroscopy (EDS) corroborates the presence of Ag, Bi, and S elements. Raman spectroscopy revealed prominent vibrational modes associated with Bi-Ag and S-Ag bonds, affirming the material's compositional and structural characteristics. UV-Vis spectroscopy showed that the material exhibits strong absorbance in the ultraviolet region, gradually decreasing toward the visible range. Tauc plot analysis indicated an indirect bandgap of 2.0&#xa0;eV. Electrochemical impedance spectroscopy (EIS) revealed a low charge transfer resistance (R<sub>ct</sub>) of 0.69 Ω, indicating efficient charge transport. The current-voltage (I-V) characteristics exhibited a linear profile, confirming the ohmic behaviour with semiconducting / semi-insulating nature, exhibiting a resistivity of 4.91 × 10<sup>6</sup> Ωm.</p>

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Structural, optical, and electrical properties of tri-phase (AgBiS2, Bi2S3, and Ag2S) formation during a hydrothermal synthesis of silver bismuth sulfide

  • 期刊论文

  • 发表日期：

    2025年9月15日

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  • C. P. Hiba,
  • K. Arya,
  • Bhawana Singh,
  • Poonam Lakhiwal,
  • Chandrashekhar M. Mahajan,
  • Santosh Kumar Mahapatra

摘要

A tri-phase nanomaterial composed of AgBiS2, Bi2S3, and Ag2S was formed during the hydrothermal synthesis of AgBiS2. Structural, optical, and electrical properties of this tri-phase are studied. X-ray diffraction (XRD) analysis of the observed peaks confirmed the formation of a tri-phase state. Field emission scanning electron microscopy (FESEM) displayed spherical agglomerates at a 200 nm scale, and energy-dispersive X-ray spectroscopy (EDS) corroborates the presence of Ag, Bi, and S elements. Raman spectroscopy revealed prominent vibrational modes associated with Bi-Ag and S-Ag bonds, affirming the material's compositional and structural characteristics. UV-Vis spectroscopy showed that the material exhibits strong absorbance in the ultraviolet region, gradually decreasing toward the visible range. Tauc plot analysis indicated an indirect bandgap of 2.0 eV. Electrochemical impedance spectroscopy (EIS) revealed a low charge transfer resistance (Rct) of 0.69 Ω, indicating efficient charge transport. The current-voltage (I-V) characteristics exhibited a linear profile, confirming the ohmic behaviour with semiconducting / semi-insulating nature, exhibiting a resistivity of 4.91 × 106 Ωm.