Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 50, Pages 44134-44145Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b15612
Keywords
fluorescence; conjugated oligomer; silica nanoparticles; latent fingerprints; high quantum yield
Funding
- National Natural Science Foundation of China [51503015, 51373022]
- State Key Laboratory for Advanced Metals and Materials [2016Z-08]
- Fundamental Research Funds for the Central Universities [FRF-BR-16-021A]
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Fluorescent micro- and nanosized particles have a broad range of applications in biology, medicine, and engineering. For these uses, the materials should have high emission efficiency and good photostability. However, many organic fluorophores suffer from aggregation-induced quenching effects and photobleaching. Here, we used a simple method based on covalently blending a fluorescent conjugated oligomer with silica nanoparticles to achieve emission quantum yields as high as 97%. The resulting system also showed excellent stability under continuous light illumination, in a range of pH values and temperatures, and in common solvents. This fluorescent material showed outstanding properties, including highly efficient blue emission, low cost, low toxicity, and easy synthesis. Furthermore, its effectiveness for latent fingerprint detection was demonstrated as a proof of concept on various substrates. The obtained emissive fingerprint powder gave good optical/fluorescent images with high contrast and resolution between the ridges and spaces.
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