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<p>The present research work reports the synthesis of novel GSH-capped Cu-In-Zn-S (CIZS) quantum dots (QDs), with excellent electronic and optical properties, making them suitable for biomedical applications. The CIZS QDs are synthesized via hydrothermal technique by optimizing the Zn precursor ratio, pH value, reaction time, and temperature. The photoluminescence (PL) emission peak at 720&#xa0;nm increases initially with the Zn molar ratio due to reduced surface defects but subsequently declines due to lattice strain-induced non-radiative relaxations. The pH variation from 5.5 to 11.5 significantly influences PL intensity, with lower pH leading to particle aggregation and reduced emission, while basic pH enhances PL efficiency. The reaction time (5–8&#xa0;h) and temperature (80–160 °C), also impact PL intensity. Below 120 °C, weak emission is observed due to inactive S²⁻ ions, followed by an increase due to radiative recombination. However, beyond 140 °C, PL intensity decreases due to thiol hydrolysis. The direct band gap is also tuned for different pH values using UV-visible (UV-vis) spectra, ranging from 1.96 to 3.86&#xa0;eV with varying diameters. The optimal luminescence is achieved at a Cu: In: Zn: S ratio of 1:4:12:2, synthesized at 140 °C for 6&#xa0;h with a pH value of 10.5. Fourier-transform infrared spectroscopy (FTIR) confirmed effective GSH capping via hydrogen bonding. Structural analysis revealed a tetragonal phase with a crystallite size of ~ 1&#xa0;nm, a spherical morphology (3.49&#xa0;nm diameter), and a hydrodynamic size of 93.5&#xa0;nm. The Zeta potential results demonstrate that synthesised CIZS QDs as stable and efficient nanomaterials for biomedical applications.</p>

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Synthesis and optimization of GSH-capped Cu-In-Zn-S quantum Dots for biomedical applications

  • 期刊论文

  • 发表日期：

    2025年7月16日

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  • Swati Sharma,
  • Shikshita Jain,
  • S. K. Tripathi

摘要

The present research work reports the synthesis of novel GSH-capped Cu-In-Zn-S (CIZS) quantum dots (QDs), with excellent electronic and optical properties, making them suitable for biomedical applications. The CIZS QDs are synthesized via hydrothermal technique by optimizing the Zn precursor ratio, pH value, reaction time, and temperature. The photoluminescence (PL) emission peak at 720 nm increases initially with the Zn molar ratio due to reduced surface defects but subsequently declines due to lattice strain-induced non-radiative relaxations. The pH variation from 5.5 to 11.5 significantly influences PL intensity, with lower pH leading to particle aggregation and reduced emission, while basic pH enhances PL efficiency. The reaction time (5–8 h) and temperature (80–160 °C), also impact PL intensity. Below 120 °C, weak emission is observed due to inactive S²⁻ ions, followed by an increase due to radiative recombination. However, beyond 140 °C, PL intensity decreases due to thiol hydrolysis. The direct band gap is also tuned for different pH values using UV-visible (UV-vis) spectra, ranging from 1.96 to 3.86 eV with varying diameters. The optimal luminescence is achieved at a Cu: In: Zn: S ratio of 1:4:12:2, synthesized at 140 °C for 6 h with a pH value of 10.5. Fourier-transform infrared spectroscopy (FTIR) confirmed effective GSH capping via hydrogen bonding. Structural analysis revealed a tetragonal phase with a crystallite size of ~ 1 nm, a spherical morphology (3.49 nm diameter), and a hydrodynamic size of 93.5 nm. The Zeta potential results demonstrate that synthesised CIZS QDs as stable and efficient nanomaterials for biomedical applications.