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首页> 外文期刊>Forensic science international >An efficient strategy to detect latent fingermarks on metallic surfaces
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An efficient strategy to detect latent fingermarks on metallic surfaces

机译：检测金属表面潜在指纹的有效策略

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摘要

The aim of this work is to use metal sputtering for the development of latent fingermarks on metallic surfaces by taking advantage of the prints' topography. In order to promote the preferential deposition onto fingerprints' ridges the deposition parameters should be optimized.After a previous selection, copper and gold thin films were deposited by magnetron sputtering onto stainless steel substrates where fingermarks were intentionally placed. After optimizing the deposition parameters, the influence of the fingermarks' age was studied. The quality of the developed fingermarks was evaluated visually and through optical and scanning electron microscopy. The morphology of the copper and gold thin films was examined by high resolution scanning electron microscopy.The preferential magnetron sputtering deposition of copper and gold thin films, 20-30. nm thick, allows latent fingermarks to be successfully developed. The gold films are more promising, especially for detecting non-fresh fingermarks and for conserving the developed marks. It was possible to detect the contours of the ridges and localize minutiae features in a one-month aged impression developed by gold deposition. These films present discontinuous surface and columnar cross-sections, while copper thin films have a featureless morphology.
机译：这项工作的目的是利用金属溅射技术，通过利用印刷品的形貌在金属表面上形成潜在的指印。为了促进在指纹脊上的优先沉积，应该优化沉积参数。在事先选择之后，通过磁控溅射将铜和金薄膜沉积在有意放置指印的不锈钢基底上。在优化沉积参数之后，研究了指印年龄的影响。目测并通过光学和扫描电子显微镜评价所形成的指印的质量。铜和金薄膜的形貌通过高分辨率扫描电子显微镜检查。优先磁控溅射沉积铜和金薄膜，20-30。纳米厚，可以成功开发潜在的指印。金膜更有希望，特别是用于检测不新鲜的指印并保留已显影的印记。可以检测出山脊的轮廓，并在由金沉积形成的一个月老化的压痕中定位细节特征。这些薄膜呈现不连续的表面和圆柱状横截面，而铜薄膜具有无特征的形态。

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