Research on Fingerprint Display Technology of Different Trace-bearing Objects under Nano-Enhanced Effect

DOI: https://doi.org/10.62517/jsse.202508203

Author(s)

Jin Wang, Yang Zhang, Haofei Tang, Baohua Tang*

Affiliation(s)

China People's Police University, Langfang, Hebei, China *Corresponding Author

Abstract

Fingerprinting is a key component of trace extraction in court science, and its effectiveness is significantly affected by the surface characteristics of the object bearing the traces and environmental factors. Although the traditional fingerprint technology has developed greatly over the years, there are still limitations in non-destructive display, contrast, line breakage and humidity sensitivity. In order to address the problem of poor rendering effect in grease-enriched humid environments, this paper proposes a new method based on the composite synergistic system of nano-SiO₂-CTAB-isopropanol. The study determines the optimal solvent system through parameter optimisation; compares different concentration ratios to find out the optimal composite system composed of nano-SiO₂ (5g), CTAB (1.5g) and 6% isopropanol (50mL); examines the effect of ambient humidity; and compares the powder method with the system's effect of manifestation on different non-permeable smooth objects. The experimental results showed that the nanocomposite enhancement system had excellent rendering effect and clear detail characteristics under the optimal ratio. Compared with the traditional powder method, its significant advantages are high contrast, high sensitivity, good selectivity and wider range of applicable objects. This technology provides a new path for the non-destructive and efficient extraction of fingerprints on different objects, which is of great practical significance for improving the standardisation of physical evidence examination.

Keywords

Fingerprint Manifestation Technology; Nanocomposite Enhancement System; Non-Permeable Smooth Object

References

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