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<p>A luminescent nanocomposite of silicon quantum dot@silica (SiQDs @SiO₂) nanoparticles (NPs) was synthesized via Stöber method, with a uniform diameter of ~ 30&#xa0;nm for non-contact temperature sensing and security. The synthesized SiQDs@SiO₂NPs was characterized using TEM, XRD, FTIR, and XPS. This nanocomposite reveals a luminescence quantum yield of 55% and displays a significant excitation-dependent emission, spanning the blue, cyan, and green regions of the spectrum. Furthermore, they exhibit high temperature sensitivity, reaching a maximum relative sensitivity of 1.3% K⁻<sup>1</sup> within the physiological temperature range, which enables precise non-contact temperature monitoring for biological sensing. Furthermore, they exhibit high temperature sensitivity, reaching a maximum relative sensitivity of 1.3% K⁻<sup>1</sup> within the physiological temperature range, which enables precise non-contact temperature monitoring for biological sensing. These NPs effectively reveal latent fingerprints on both porous and non-porous surfaces, providing exceptional contrast and detail. Their inherent biocompatibility, small size, and cyan luminescence make them promising candidates for advanced applications in biological temperature sensing and high-resolution security imaging.</p>

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Blue-emitting silicon quantum dots: advancing security and temperature sensing capabilities

  • 期刊论文

  • 发表日期：

    2025年11月10日

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  • Esraa Sherif,
  • Yasmeen G. Abou El-Reash,
  • Zaynab Ghubish,
  • Ola M. El-Borady,
  • Nuha Y. Elamin,
  • Maged El-Kemary

摘要

A luminescent nanocomposite of silicon quantum dot@silica (SiQDs @SiO₂) nanoparticles (NPs) was synthesized via Stöber method, with a uniform diameter of ~ 30 nm for non-contact temperature sensing and security. The synthesized SiQDs@SiO₂NPs was characterized using TEM, XRD, FTIR, and XPS. This nanocomposite reveals a luminescence quantum yield of 55% and displays a significant excitation-dependent emission, spanning the blue, cyan, and green regions of the spectrum. Furthermore, they exhibit high temperature sensitivity, reaching a maximum relative sensitivity of 1.3% K⁻1 within the physiological temperature range, which enables precise non-contact temperature monitoring for biological sensing. Furthermore, they exhibit high temperature sensitivity, reaching a maximum relative sensitivity of 1.3% K⁻1 within the physiological temperature range, which enables precise non-contact temperature monitoring for biological sensing. These NPs effectively reveal latent fingerprints on both porous and non-porous surfaces, providing exceptional contrast and detail. Their inherent biocompatibility, small size, and cyan luminescence make them promising candidates for advanced applications in biological temperature sensing and high-resolution security imaging.