Strongly fluorescent conjugated polymer nanoparticles in aqueous colloidal solution for universal, efficient and effective development of sebaceous and blood fingerprints

Fan, Zhinan; Chen, Xiao; Kong, Ranran; Lu, Yaoqi; Ma, R.; Wu, Jiawei; Fan, Li‐Juan

doi:10.1016/j.jcis.2023.03.173

Cited by 4 publications

(3 citation statements)

References 33 publications

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“…Fingerprints are unique and individual characteristics of the human body that have been used for identification purposes for more than a century. The science behind fingerprints is fascinating, and their use in law enforcement, security systems, and other industries has made them an invaluable tool in the modern world. − Fingerprints have found numerous applications in our daily lives, including access control, privacy protection, and individual identification. Here, highly fluorescent fluorescein-doped latex nanoparticles were used as anticounterfeiting inks to prepare individual identification fingerprints.…”

Section: Resultsmentioning

confidence: 99%

Colloidal Polymer Nanoparticles as Smart Inks for Authentication and Indication of Latent Fingerprints and Scratch

Mardani,

Mehrbakhsh,

Sheikhzadegan

et al. 2023

ACS Appl. Mater. Interfaces

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An environmentally friendly smart ink was developed by incorporating fluorescein into functionalized poly(methyl methacrylate) (PMMA) nanoparticles synthesized using an emulsifier-free emulsion copolymerization approach. The functional comonomers of 2-(dimethylamino)ethyl methacrylate (DMAEMA), acrylamide, hydroxyethyl methacrylate, and glycidyl methacrylate in 10 wt % with respect to methyl methacrylate were used to obtain the functionalized colloidal PMMA nanoparticles. Functional groups of the latex nanoparticles were characterized by Fourier-transform infrared spectroscopy. Field emission scanning electron microscopy results showed that all of the latex nanoparticles have nearly spherical morphologies with variations in size and surface smoothness due to the presence of different comonomers. Ultraviolet−visible and fluorescence spectra indicated that the fluorescein-doped latex nanoparticles containing the DMAEMA comonomer had the highest absorbance and fluorescence intensity. In the alkaline media, fluorescein turns to a dianion, showing a red shift and increased absorbance in the UV−vis spectroscopy. In addition, the electron inductive characteristics of the tertiary amine groups result in enhancing the conjugation of fluorescein molecules and increasing the fluorescence intensities. Therefore, the colloidal nanoparticles with amine functional groups were used in the formulation of a smart ink with applications in securing documents and fingerprints, encrypting banknotes and money, detecting latent fingerprints, crafting anticounterfeiting paper, and eventually providing optical detection and indication of surface scratches.

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Section: Resultsmentioning

confidence: 99%

Colloidal Polymer Nanoparticles as Smart Inks for Authentication and Indication of Latent Fingerprints and Scratch

Mardani,

Mehrbakhsh,

Sheikhzadegan

et al. 2023

ACS Appl. Mater. Interfaces

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“…20−22 Recently, we advanced an "adaptive development strategy", and with this concept, we successfully visualized blood or sebaceous fingermarks with the same fluorescent reagent and the same developing protocol. 23,24 There are two critical points for this "adaptive strategy". The first is introducing multiple groups (or chemical structures), some of which can interact with sebaceous components, while others can interact with blood components.…”

Section: Introductionmentioning

confidence: 99%

“…Researchers are working hard to apply different types of fluorescent materials for the development and enhancement of fingermarks, providing a variety of options for forensic investigation. ,− Fluorescent conjugated polymers (CPs) have the advantages of low toxicity, photostability, high quantum yield, and tunable structure that are essential for fingermark development. − Our group has successfully developed a series of conjugated polymer-based materials to effectively develop or enhance blood or sebaceous fingermarks. − Recently, we advanced an “adaptive development strategy”, and with this concept, we successfully visualized blood or sebaceous fingermarks with the same fluorescent reagent and the same developing protocol. , There are two critical points for this “adaptive strategy”. The first is introducing multiple groups (or chemical structures), some of which can interact with sebaceous components, while others can interact with blood components.…”

Section: Introductionmentioning

confidence: 99%

A Universal Developing Strategy for Fingermark Detection and Enhancement Based on Disodium Iminodiacetate-Functionalized Conjugated Polymer

Kong,

Cao,

Zhang

et al. 2024

ACS Appl. Polym. Mater.

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Finding a universal fingermark developing strategy effective for all types of fingermarks may improve the efficiency of forensic investigation. Here, we synthesized a fluorescent conjugated polymer (PTPEPE-IDA) with poly[p-(tetraphenylethene)-alt-(phenylene ethylene)] as the backbone and carrying pendant disodium iminodiacetate and monocarboxylate groups to interact with sweat, which is commonly present in fingermarks. PTPEPE-IDA was dissolved in ethanol to form the developing reagent, which was demonstrated to be effective in visualizing and enhancing sweat-containing sebaceous and blood fingermarks on various substrates with the same developing protocol. With the increase of the sweat content in fingermarks, the fluorescence intensity and clarity of patterns of the developed fingermarks increased. This strategy was effective for sweat-containing fingermarks aged for up to 100 days. The developed fingerprint has high stability, being recognizable after storage for 100 days or immersion in water (or ethanol). Mechanism investigation suggests that PTPEPE-IDA can bind some components in sweat and blood through synergistic effects of multiple interactions, and the aggregation-induced emission enhancement (AIEE) upon sweat was demonstrated by the macroscopic view and emission/absorption spectra, which is beneficial to detect the fingermark quickly and then enhance the legibility of the pattern. This universal strategy is expected to make fingermark development more efficient.

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From invisible to visible: a concise review on conjugated polymer materials in latent fingerprint analysis

Bashir,

Amin,

Majid

et al. 2024

J Polym Res

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Over the past decades, significant scientific and technological advancements have been made in the field of forensic science, particularly in the advancement of fingerprint technology. Latent fingerprints (LFPs) are considered to be the most crucial evidence found at crime scenes, necessitating extensive research efforts for their advancement. Conversely, conjugated polymers are extremely adaptable substances that are utilized in many domains like photonics, bio-imaging, optoelectronics, nanomedicine, and more. Conjugated polymers, especially conjugated polymer nanoparticles and polymer dots, exhibit remarkable photophysical and chemical features that contribute to their high resolution, enhanced selectivity, and heightened sensitivity in the development of LFPs. This provides a detailed overview of the production of LFPs utilizing conjugated polymers, as well as the imaging techniques employed for their visualization. Particular attention is given to conjugated polymer nanoparticles and polymer dots. In addition, the most often employed techniques for producing conjugated polymer-based nanoparticles have also been examined. Additionally, it encompasses the historical background of LFP identification and offers a valuable understanding of the diverse conventional approaches investigated for their advancement. This article offers a comprehensive examination of conjugated polymers as contrasting agents for imaging LFPs on different surfaces.

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Strongly fluorescent conjugated polymer nanoparticles in aqueous colloidal solution for universal, efficient and effective development of sebaceous and blood fingerprints

Cited by 4 publications

References 33 publications

Colloidal Polymer Nanoparticles as Smart Inks for Authentication and Indication of Latent Fingerprints and Scratch

Colloidal Polymer Nanoparticles as Smart Inks for Authentication and Indication of Latent Fingerprints and Scratch

A Universal Developing Strategy for Fingermark Detection and Enhancement Based on Disodium Iminodiacetate-Functionalized Conjugated Polymer

From invisible to visible: a concise review on conjugated polymer materials in latent fingerprint analysis

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