磁性荧光银纳米簇的绿色合成及其对汗潜指印的可视化显现

Green Synthesis of Magnetic Fluorescent Silver Nanoclusters for Visualizing Latent Fingerprints

目的制备具有可见荧光性和优良磁性的GSH-AgNCs@PEI-Fe3O4(glutathione-Ag nanoclusters@Polyethyleneimine-Fe3O4)多功能复合纳米材料并将其应用于汗潜指印的可视化显现。方法以GSH(glutathione)为保护剂和还原剂,采用超声-加热循环法制备了带负电荷的银纳米簇;以PEI(Polyethyleneimine)为修饰剂制备了带正电荷的功能化的磁性纳米粒子;采用自组装法使得银纳米簇和磁性纳米粒子在超声加热的控制下通过静电吸附作用和配位作用合成多功能复合纳米材料,并对其进行性质研究。将复合物制成粉末分别对不同状态下的潜指印进行可视化显现及比较。结果制备的复合纳米材料呈球形,为核壳包覆结构,平均粒径为141.2nm,磁性优良,荧光发射波长为560nm,呈明亮的黄色荧光,潜指印可视化效果好。结论GSH-AgNCs@PEI-Fe3O4粉末可应用于多种状态下汗潜指印的显现,其制备绿色简单、成本低、荧光效能高,兼具纳米簇和磁性纳米粒子的双重特性,是一种环保高效便捷的显现方法。

Objective To prepare the multifunctional nanomaterial named GSH-AgNCs@PEI-Fe3O4 of visible fluorescence and excellent magnetic properties for unveiling latent fingermarks.Methods The negative-charge-bearing silver nanoparticles were prepared by glutathione used as the protectant and reducing agent,so were the functional magnetic nanoparticles bearing positive charges by polyethyleneimine used as modifier.The self-assembling is carried out to synthesize the multifunctional nanomaterial through electrostatic adsorption and coordination under the control of ultrasonic heating,leaving its properties to be studied.The latent fingermarks in different states were visualized with the composite powder from above-prepared nanomaterial,having their development compared.Results The so-prepared composite nanomaterials were of spherical and core-shell cladding structure with an average particle size of 141.2nm,excellent magnetic properties,and bright yellow fluorescence under emission wavelength of 560nm,capable of making the latent fingerprints developed into good visualization.Conclusions GSH-AgNCs@PEI-Fe3O4 powders are able to develop latent sweat fingermarks in various states. The preparation of GSH-AgNCs@PEI-Fe3O4 powder is simple,low cost,high fluorescence efficiency,demonstrating the dual characteristics of nano-clusters and magnetic nanoparticles.Additionally,such a manipulation is also green,beneficial for environmental protection.