Enhanced Near-Infrared Emission from Carbon Dots by Surface Deprotonation.

Liu, Enshan; Liang, Tao; Ushakova, Elena V; Wang, Bingzhe; Zhang, Bohan; Zhou, Huiqun; Xing, Guichuan; Wang, Chunming; Tang, Zikang; Qu, Songnan; Rogach, Andrey L

Liu, Enshan; Liang, Tao; Ushakova, Elena V; Wang, Bingzhe; Zhang, Bohan; Zhou, Huiqun; Xing, Guichuan; Wang, Chunming; Tang, Zikang; Qu, Songnan; Rogach, Andrey L.

Afiliação

Liu E; Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Taipa 999078, Macau SAR.
Liang T; Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Taipa 999078, Macau SAR.
Ushakova EV; Department of Materials Science and Engineering and Centre for Functional Photonics (CFP), City University of Hong Kong, Kowloon 999077, Hong Kong SAR.
Wang B; Center of Information Optical Technologies, ITMO University, Saint Petersburg 197101, Russia.
Zhang B; Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Taipa 999078, Macau SAR.
Zhou H; Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Taipa 999078, Macau SAR.
Xing G; State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau SAR, Taipa 999078, Macau SAR.
Wang C; Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Taipa 999078, Macau SAR.
Tang Z; State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, Macau SAR, Taipa 999078, Macau SAR.
Qu S; Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Taipa 999078, Macau SAR.
Rogach AL; Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Taipa 999078, Macau SAR.

J Phys Chem Lett ; 12(1): 604-611, 2021 Jan 14.

Article em En | MEDLINE | ID: mdl-33382631

ABSTRACT

ABSTRACT

Carbon dots (CDs) with efficient excitation and emission in deep-red/near-infrared (NIR) spectral range are important for bioimaging applications. Herein, we develop a simple and effective method to significantly enhance both the absorption and emission of CDs in deep-red/NIR by suppressing nonradiative charge recombination via deprotonation of the CD surface. As compared to aqueous solutions at room temperature, NIR emission of CDs in N,N-dimethylformamide and glycerol experience a 50- and 70-fold increase at -20 °C, respectively, due to enhanced deprotonation ability and viscosity. On the basis of the adjustable NIR fluorescence intensity of CDs, multilevel data encryption in the NIR region is realized by controlling the humidity and the temperature of a CD-ink stamped paper.

Assuntos

Carbono/química; Nanopartículas/química; Prótons; Dimetilformamida/química; Modelos Moleculares; Conformação Molecular; Espectrofotometria Infravermelho; Propriedades de Superfície; Temperatura

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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Prótons / Carbono / Nanopartículas Idioma: En Revista: J Phys Chem Lett Ano de publicação: 2021 Tipo de documento: Article

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