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Background <p>Fingerprints are the most reliable means of identification. It is widely accepted physical evidence usually found on various items recovered from the crime scenes. It can be used to ascertain the identity of a person or to provide a direct link of suspect to weapon or scene of crime. Various methods have been used to detect the latent fingermarks on porous and nonporous surfaces.</p> Materials and methodology <p>In this present study, the novel SiO<sub>2</sub>/CuO nanocomposites have been synthesized and characterized using the PXRD, FE-SEM, TEM, and FT-IR. First copper oxide nanoparticles were synthesized by precipitation method, and silica nanospheres were separately synthesized by Stober method. Thereafter, as-synthesized copper oxide nanoparticles were coated on the silica spheres. This SiO<sub>2</sub>/CuO nanocomposites were used to develop fingermarks exposed to various environmental conditions as described in the title.</p> Results <p>By using the Debye–Scherrer equation, the average crystalline size of SiO<sub>2</sub>/CuO nanocomposites was calculated to be 33.68&#xa0;nm. By SEM analysis, the silica were spherical in shape, and CuO had a rodlike structure. The synthesized nanocomposite develops sharp and clear fingerprints on a wide range of dry, smooth, and nonporous surfaces, i.e., aluminum foil, bakelite sheet, CD back side, CD front side, glass slide, and black ceramic tile which may be discerned in natural light. Further, the synthesized nanocomposite was used to develop latent fingerprints treated with acid and base.</p> Conclusion <p>This developed SiO<sub>2</sub>/CuO nanocomposites are useful in detecting and developing weak and fragmented chance prints from scenes of crime. The synthesized SiO<sub>2</sub>/CuO nanocomposites are non-hazardous and cost effective.</p>

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A pilot study on the effect of time and acidic/basic conditions on the development of intent fingermarks using silica-copper oxide (SiO2/CuO) nanocomposite

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年2月27日

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  • Aseem Grover,
  • Gurvinder Singh Bumbrah,
  • Anirban Das

摘要

Background

Fingerprints are the most reliable means of identification. It is widely accepted physical evidence usually found on various items recovered from the crime scenes. It can be used to ascertain the identity of a person or to provide a direct link of suspect to weapon or scene of crime. Various methods have been used to detect the latent fingermarks on porous and nonporous surfaces.

Materials and methodology

In this present study, the novel SiO2/CuO nanocomposites have been synthesized and characterized using the PXRD, FE-SEM, TEM, and FT-IR. First copper oxide nanoparticles were synthesized by precipitation method, and silica nanospheres were separately synthesized by Stober method. Thereafter, as-synthesized copper oxide nanoparticles were coated on the silica spheres. This SiO2/CuO nanocomposites were used to develop fingermarks exposed to various environmental conditions as described in the title.

Results

By using the Debye–Scherrer equation, the average crystalline size of SiO2/CuO nanocomposites was calculated to be 33.68 nm. By SEM analysis, the silica were spherical in shape, and CuO had a rodlike structure. The synthesized nanocomposite develops sharp and clear fingerprints on a wide range of dry, smooth, and nonporous surfaces, i.e., aluminum foil, bakelite sheet, CD back side, CD front side, glass slide, and black ceramic tile which may be discerned in natural light. Further, the synthesized nanocomposite was used to develop latent fingerprints treated with acid and base.

Conclusion

This developed SiO2/CuO nanocomposites are useful in detecting and developing weak and fragmented chance prints from scenes of crime. The synthesized SiO2/CuO nanocomposites are non-hazardous and cost effective.