Rescuing fluorescence with steric hindrance: Perylene diimide based powder for latent fingerprint imaging

IF 2.6 3区医学 Q2 CHEMISTRY, ANALYTICAL

Forensic Chemistry Pub Date : 2025-04-08 DOI:10.1016/j.forc.2025.100662

Rajdeep Kaur, Navjot Kaur, Prabhpreet Singh

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Abstract

We reported sterically crowded perylene diimide for rescuing its solid-state fluorescence through functionalization with bulkier hydroxyphenyl benzothiazole (PH2). The PH2 has (i) λ_max.at 620 nm; (ii) 28.8 % solid-state quantum yield and (iii) 100 % red colour purity calculated from CIE plot. PH2 adsorbed on silica nanoparticles was utilized as a fluorescent powder for the visualization of latent fingerprints on different porous, non-porous and curved surfaces using powder-dusting methods. The LFPs were subjected to laboratory conditions simulating those in the field such as aging, temperature, UV light and humidity and we successfully demonstrated the applicability of PH2-SiO₂ powder for the development and visualization of ridge pattern from these degraded LFPs. We also aimed to recover LFPs from physical evidence by developing the LFPs with PH2-SiO₂ followed by lifting of fingerprints using adhesive tape.

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具有空间位阻的挽救荧光：苝二亚胺基粉末用于潜在指纹成像

我们报道了空间拥挤的苝二亚胺通过与体积较大的羟基苯并噻唑（PH2）官能化来挽救其固态荧光。PH2具有(i) λmax。620nm；（ii） 28.8%的固体量子产率和（iii） 100%的红色纯度计算从CIE图。利用吸附在二氧化硅纳米颗粒上的PH2作为荧光粉，采用粉末除尘法对不同多孔、非多孔和曲面上的潜在指纹进行可视化。实验结果表明，在老化、温度、紫外光和湿度等实验室模拟条件下，PH2-SiO2粉末可用于降解lfp的脊状图案的形成和可视化。我们还试图通过用PH2-SiO2制备lfp，然后用胶带提取指纹，从物证中恢复lfp。

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来源期刊

Forensic Chemistry CHEMISTRY, ANALYTICAL-

CiteScore

5.70

自引率

14.80%

发文量

审稿时长

46 days

期刊介绍： Forensic Chemistry publishes high quality manuscripts focusing on the theory, research and application of any chemical science to forensic analysis. The scope of the journal includes fundamental advancements that result in a better understanding of the evidentiary significance derived from the physical and chemical analysis of materials. The scope of Forensic Chemistry will also include the application and or development of any molecular and atomic spectrochemical technique, electrochemical techniques, sensors, surface characterization techniques, mass spectrometry, nuclear magnetic resonance, chemometrics and statistics, and separation sciences (e.g. chromatography) that provide insight into the forensic analysis of materials. Evidential topics of interest to the journal include, but are not limited to, fingerprint analysis, drug analysis, ignitable liquid residue analysis, explosives detection and analysis, the characterization and comparison of trace evidence (glass, fibers, paints and polymers, tapes, soils and other materials), ink and paper analysis, gunshot residue analysis, synthetic pathways for drugs, toxicology and the analysis and chemistry associated with the components of fingermarks. The journal is particularly interested in receiving manuscripts that report advances in the forensic interpretation of chemical evidence. Technology Readiness Level: When submitting an article to Forensic Chemistry, all authors will be asked to self-assign a Technology Readiness Level (TRL) to their article. The purpose of the TRL system is to help readers understand the level of maturity of an idea or method, to help track the evolution of readiness of a given technique or method, and to help filter published articles by the expected ease of implementation in an operation setting within a crime lab.