Red-Emissive Carbon Dots for Fingerprints Detection by Spray Method: Coffee Ring Effect and Unquenched Fluorescence in Drying Process

Brightly red fluorescent carbon dots are synthesized hydrothermally and dissolved in diluted hydrochloric acid solution. Such carbon dots exhibit excitation-independent emission at about 620 nm with quantum yield over 10%, which is visible in daylight. After the carbon dots solution is sprayed to th...

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Published inACS applied materials & interfaces Vol. 9; no. 22; pp. 18429 - 18433
Main Authors Chen, Jie, Wei, Ji-Shi, Zhang, Peng, Niu, Xiao-Qing, Zhao, Wei, Zhu, Ze-Yang, Ding, Hui, Xiong, Huan-Ming
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 07.06.2017
Subjects
air
carbon quantum dots
drying
electrostatic interactions
fluorescence
hydrochloric acid
solar radiation
fingerprint
visualization
carbon dot
coffee ring effect
fluorescence
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Summary:Brightly red fluorescent carbon dots are synthesized hydrothermally and dissolved in diluted hydrochloric acid solution. Such carbon dots exhibit excitation-independent emission at about 620 nm with quantum yield over 10%, which is visible in daylight. After the carbon dots solution is sprayed to the fingerprints on various solid substrates and dried in air, clear fingerprints can be seen under an ultraviolet lamp and stay stable for 1 day. Detailed characterizations suggest that during the drying process, the coffee-ring effect and the electrostatic interactions between the carbon dots and the fingerprint residues prevent the typical aggregation-induced fluorescence quenching of carbon dots.
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ISSN:1944-8244
1944-8252
1944-8252
DOI:10.1021/acsami.7b03917