Ionic liquid capped white luminescent carbon dots: application in sensing and bioimaging. (April 2023)

• Record Type: Journal Article
• Authors: Mehra, S.; Khandare, S.D.; Singh, K.; Chaudhary, D.R.; Kumar, A.
• Is Part Of: Materials today chemistry. Volume 29(2023)
• Publication Date: 2023-04
• Subjects: Ionic liquids -- Carbon dots -- Surface passivation -- Bioimaging -- Sensing; Chemistry -- Periodicals; Materials -- Research -- Periodicals; Materials science -- Periodicals; Chemistry; Materials -- Research; Electronic journals; Periodicals; 660.282
• DOI: 10.1016/j.mtchem.2023.101437
• Languages: English
• ISSNs: 2468-5194

Abstract

Abstract: A new category of white luminescent materials, white-light-emitting carbon dots (CDs), has gained massive attention due to their exclusive features and potential applications. The complicated structure of CDs confuses the understanding of their photoluminescence (PL) mechanism, which is still unclear and a significant challenge to interpret the surface chemistry. This work compares the hydrothermal and ionic liquid (IL) solvothermal approaches to producing high-quality CDs. The modulation of solvent with IL and doping amount of nitrogen gives the white-light-emitting CDs. In particular, the CDs-IL exhibits novel and robust white PL performance. IL surface modification led to PL enhancement with a red shift from 543 nm to 620 nm and an increase in the quantum yield from 16.8 ± 2% to 68.6 ± 2%. The enhancement in PL of CDs-IL inspired us to utilize them as bioimaging probes on bacterial cell lines and sensing probes for water pollutants Fe 3+ and trinitrophenol, lower the detection limit 0.117 ± 0.010 μM and 0.049 ± 0.005 μM. These results confirmed that IL capped on the surface functional group of CDs forms a stable structure surrounding the CDs. Our finding provides clear evidence for the surface chemistry-dependent PL behavior of CDs. Graphical abstract: Image 1 Highlights: Carbon dots are prepared from alginic acid and 1, 4-phenylenediamine in an aqueous and ionic liquid medium. Ionic liquid-capped carbon dots show white-light emissions with high photoluminescence quantum yield than the aqueous system. Ionic liquid-capped carbon dots show ultra-sensitivity toward nitro Fe 3+ and trinitrophenol. Ionic liquid-capped carbon dots serves as a luminous probe for bioimaging.