Mishra Shiv Rag, Mandal Tuhin, Ghosh Ashish Kumar, Singh Vikram
Environment Emission and CRM Section, CSIR-Central Institute of Mining and Fuel Research Dhanbad Jharkhand 828108 India.
Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 India.
Nanoscale Adv. 2025 Jun 3. doi: 10.1039/d5na00370a.
Anticounterfeiting and latent fingerprinting have become ever-growing global demands, impacting national economies, defence and various technological fields. This has led to an increasing need for photoluminescent materials that are nontoxic, highly luminous, photostable, more sensitive and low-cost. However, there is a lack of research reports that offer a detailed exploration of photoluminescent materials for both anticounterfeiting and latent fingerprinting. Thus, we explored waste pistachio shell biomass-derived tunable fluorescent carbon nanoparticles as an invisible/security ink for latent fingerprint visualization and anticounterfeiting labels. Three levels of security characteristics for fingerprint analysis were investigated to enable a more comprehensive exploration of the synthesised fluorescent carbon nanoparticles. The invisible distinctive impression of the ridges, grooves, and furrows of the fingers was visible on the thin layer chromatographic plate after fluorescent carbon nanoparticle-based ink was applied to the finger under UV-light excitation. The anticounterfeiting study was performed after labelling the prepared ink on Whatman filter paper, TLC plates, PVA films and Indian currency to investigate its diversified applications. This study provides a new prospect for low-cost and non-toxic photoluminescent carbon nanoparticles as invisible ink for security, encryption, and labels.
防伪和潜在指纹识别已成为全球日益增长的需求，影响着国民经济、国防和各个技术领域。这导致对无毒、高发光性、光稳定性好、更灵敏且低成本的光致发光材料的需求不断增加。然而，缺乏对用于防伪和潜在指纹识别的光致发光材料进行详细探索的研究报告。因此，我们探索了以废弃开心果壳生物质为原料制备的可调谐荧光碳纳米颗粒，将其作为用于潜在指纹可视化和防伪标签的隐形/安全墨水。研究了用于指纹分析的三个安全特性级别，以便更全面地探索合成的荧光碳纳米颗粒。在紫外光激发下，将基于荧光碳纳米颗粒的墨水涂在手指上后，手指纹路、沟壑和皱纹的隐形独特印记在薄层色谱板上可见。在将制备的墨水标记在沃特曼滤纸、薄层色谱板、聚乙烯醇薄膜和印度货币上后进行了防伪研究，以研究其多样化应用。本研究为低成本且无毒的光致发光碳纳米颗粒作为用于安全、加密和标签的隐形墨水提供了新的前景。
