Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 14, Pages 16746-16754Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c02563
Keywords
polymer micelles; AIE plus ESIPT; cross-linking induced emission; fluorescent imaging; latent fingerprints
Funding
- NSFC [51873058, 52173278, 51773056, 52073087]
- Hunan Provincial Natural Science Foundation of China [2020JJ3021, 2021JJ10029]
- Key Research and Development Program of Hunan province [2019GK2237]
- Open Fund of Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates (South China University of Technology) [2020-kllma11]
- Open Fund of the State Key Laboratory of Luminescent Materials and Devices (South China University of Technology) [2019-skllmd-09]
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In this study, fluorescent polymer micelles (PMs) were designed and synthesized for high-contrast fluorescence imaging of latent fingerprints (LFPs). The PMs exhibited aggregation-induced emission (AIE) and excited state intramolecular proton transfer (ESIPT) properties, allowing for high water dispersibility, high selectivity, a large Stokes shift, good photostability, and excellent long-term stability. The PMs preferentially adhered onto the ridges of fingerprints due to hydrophobic interaction, and the cross-linking reaction induced emission properties enabled high-contrast imaging of LFPs in different substrates.
Rationally developing an intelligent tool for high-contrast fluorescence imaging of latent fingerprints (LFPs) is gaining much concern in many applications such as medical diagnostics and forensic investigations. Herein, the off-on fluorescent polymer micelles (PMs) have been rationally designed and synthesized for high-contrast fluorescence imaging of LFPs through the cross-linking reaction of hydrazine (N2H4) and aldehyde group of polymer. Excitingly, the cross-linking (N2H4) induced emission of PMs has the property of aggregation-induced emission (AIE) and excited state intramolecular proton transfer (ESIPT), which could effectively address the notorious aggregation-caused quenching (ACQ) effects of conventional organic dyes. In addition, the cross-linking strategy can not only improve structural stability of PMs but also enhance its fluorescence brightness. The experiment results demonstrated that PMs showed high water dispersibility (100% aqueous solution), high selectivity, large Stokes shift (similar to 150 nm), good photostability, and excellent long-term stability. Because of the hydrophobic interaction between the PMs and fingerprint components, the PMs preferentially adhered onto the ridges of fingerprint, and then cross-linking (N2H4) induced emission properties endowed the PMs for high-contrast imaging of LFPs in different substrates, especially the levels 1-3 details of LFPs. We expect that this strategy will provide vital support for LFPs technology.
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