Preparation of Novel Magnetic Nanomaterials Based on "Facile Coprecipitation" for Developing Latent Fingerprints (LFP) in Crime Scenes.
Preparation of Novel Magnetic Nanomaterials Based on "Facile Coprecipitation" for Developing Latent Fingerprints (LFP) in Crime Scenes.
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基于“简易共沉淀”的新型磁性纳米材料的制备，用于在犯罪现场开发潜指纹 (LFP)
DOI：
10.1021/acsomega.1c04208
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发表时间：
2022-01-18
期刊：
影响因子：
4.1
通讯作者：
Yuan B
中科院分区：
文献类型：
--
作者：
Wan J;Chen L;Li W;Cui S;Yuan B
近年来，新型纳米材料，特别是磁性纳米材料在潜在指纹显现中的应用，已成为法医学和刑事侦查学研究的热点。Fe 3 O 4纳米粒子作为一种可回收利用的环保材料，在LFP的可视化方面取得了很好的效果。首次报道了采用“简易共沉淀法”合成并包覆纳米Fe_3O_4，将3-巯丙基三乙氧基硅烷共价包埋在纳米Fe_3O_4粒子中，并将纳米银包覆在Fe_3O_4核上，制备了具有核壳结构的新型磁性纳米材料（P-MNP@Ag）。为了比较，磁性纳米材料（S-MNP@Ag）通过表面改性制备。采用SEM、TEM、XRD、IR、XPS、VSM等测试手段对其组成、结构和性能进行了表征。与市售的金粉、银、裸磁粉和制备的S-MNP @Ag相比，P-MNP@Ag对不同物体的LFP显影效果更好，表现出背景干扰小、灵敏度高、次级细节清晰等优点。P-MNP@Ag已在一些重大案件的现场应用于LFP的可视化。通过指纹比对确认了犯罪嫌疑人的生物特征识别，得到了公安部门的高度肯定。
Recently, the application of novel nanomaterials, especially magnetic nanomaterials in the development of latent fingerprints (LFP), has become the hot focus for forensic scientists and criminal investigators. As a type of recyclable, environment-friendly material, Fe3O4 nanoparticles achieve a wonderful effect in visualization of LFP. We first report the synthesis and encapsulation of nano-Fe3O4 through “facile coprecipitation”, (3-mercaptopropyl)triethoxysilane was covalently embedded into Fe3O4 nanoparticles, and the Fe3O4 core was encapsulated by the nanosilver to prepare novel magnetic nanomaterials (P-MNP@Ag) with the core–shell configuration. For comparison, the magnetic nanomaterials (S-MNP@Ag) were prepared by surface modification. Their composition, structure, and properties were characterized by SEM, TEM, XRD, IR, XPS, and VSM. Compared with commercially available gold powder, silver powder, bare magnetic powder, and prepared S-MNP@Ag, the development effect of LFP on different objects by using P-MNP@Ag had better performance, which presented the advantages of low background interference, high sensitivity, and clear secondary details in LFP. In the crime scenes of some influential cases, P-MNP@Ag had been applied to the visualization of LFP. The biometric identification of criminal suspects was confirmed through fingerprint comparison, which was highly affirmed by the public security department.
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