Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 513, Issue -, Pages 505-514Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2017.10.095
Keywords
Carbon dots; Surface functionalization; Fluorescence; Multicolor emission; Cell imaging
Categories
Funding
- Priority Research Centers Program [2009-0093823]
- Korean Government (MSIP) [2015R1A5A1037668]
- Brain Korea 21 plus (BK21) - Korea government
- Korea Ministry of Environment, Global Top Project [2016002130005]
- Development of diagnostic system for mild cognitive impairment due to Alzheimer's disease [2015-11-1684]
- Nano Material Technology Development Program [NRF-2017M3A7B4041987]
- National Research Foundation of Korea [2015R1A5A1037668, 2009-0093823] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Luminescent nanomaterials are encouraging scaffolds for diverse applications such as chemical sensors and biosensors, imaging, drug delivery, diagnostics, catalysis, energy, photonics, medicine, and so on. Carbon dots (CDs) are a new class of luminescent carbonaceous nanomaterial that have appeared recently and reaped tremendous scientific interest. Herein, we have exploited a simple approach to prepare tuneable and highly fluorescent CDs via surface functionalization. The successful synthesis of CDs is manifested from several investigations like high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The CDs exhibit excellent water solubility and with increasing nitrogen content fluorescence quantum yield increases whereas cell toxicity decreases. The CD synthesized at high temperature (180 degrees C) shows very high quantum yield (more than 56%). The tuneable optical properties of CDs are systematically studied using UV-vis and fluorescence spectroscopy. The cell viability evaluation and in vitro imaging study reveals that the synthesized CDs can be employed as a potential fluorescent probe for bio-imaging without further modification. (C) 2017 Elsevier Inc. All rights reserved.
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