School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002, China.
The Yangzhou Commission of Supervision, Yangzhou, 225000, China.
Anal Sci. 2021 Nov 10;37(11):1497-1503. doi: 10.2116/analsci.20P336. Epub 2021 Apr 16.
User-friendly fingerprint powders, namely efficient, low-cost and nontoxic ones, are always desirable for the development of latent fingerprints (LFPs). Here, we described the use of pristine graphic carbon nitride quantum dots (g-CN QDs) as a new kind of user-friendly fingerprint powder. The g-CN QDs can be easily prepared from urea and sodium citrate precursors through low temperature solid-phase reaction. Due to their good optical properties and selective interactions with secretion residuals, the g-CN QDs powders were exploited to develop LFPs on different substrates by the powder dusting technique. The LFP images on a plastic bag exhibited a high ridge and furrow contrast ratio, allowing for easy identification of level 1 - 3 details of LFPs. This work indicates that the g-CN QD powders provide good performance for LFP visualization and is likely to be adopted for some applications in forensic investigations.
易于使用的指印粉末,即高效、低成本和无毒的指印粉末,一直是开发潜伏指印(LFPs)所需要的。在这里,我们描述了使用原始图形氮化碳量子点(g-CN QDs)作为一种新型的易于使用的指印粉末。g-CN QDs 可以很容易地从尿素和柠檬酸钠前体通过低温固相反应制备。由于其良好的光学性质和与分泌物残留物的选择性相互作用,g-CN QDs 粉末被用于通过粉末撒粉技术在不同的基质上开发 LFPs。在塑料袋上的 LFPs 图像具有较高的脊和皱纹对比度,允许轻松识别 LFPs 的 1 级-3 级细节。这项工作表明,g-CN QD 粉末为 LFPs 的可视化提供了良好的性能,并且可能被应用于法医调查中的一些应用。
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