Kundu, Aniruddha Lee, Jungpyo Park, Byeongho Ray, Chaiti Sankar, K. Vijaya Kim, Wook Sung Lee, Soo Hyun Cho, Il-Joo Jun, Seong Chan 2024-01-19T23:04:34Z 2024-01-19T23:04:34Z 2022-01-25 2018-03 0021-9797 https://pubs.kist.re.kr/handle/201004/121629 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. English Academic Press Facile approach to synthesize highly fluorescent multicolor emissive carbon dots via surface functionalization for cellular imaging Article 10.1016/j.jcis.2017.10.095 1 Journal of Colloid and Interface Science, v.513, pp.505 - 514 Journal of Colloid and Interface Science 513 505 514 N scie scopus 000428834900055 2-s2.0-85034826972 Chemistry, Physical Chemistry Article GRAPHENE QUANTUM DOTS ONE-STEP SYNTHESIS OXIDE THIN-FILMS SENSITIVE DETECTION SELECTIVE DETECTION DEEP-ULTRAVIOLET PHOTOLUMINESCENCE LUMINESCENT NANODOTS NANOPARTICLES Carbon dots Surface functionalization Fluorescence Multicolor emission Cell imaging