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Title: Ethylenediamine mediated luminescence enhancement of pollutant derivatized carbon quantum dots for intracellular trinitrotoluene detection: Soot to shine
Authors: Devi S.
Gupta R.K.
Paul A.K.
Kumar V.
Sachdev A.
Gopinath, Packirisamy
Tyagi S.
Published in: RSC Advances
Abstract: Vehicle-generated toxic pollutants are composed of gaseous smoke and particulate byproducts accumulated as a black substance at its exhaust. This particulate matter (soot) is utilized for the green synthesis of highly stable, non-toxic, environment friendly, carbon quantum dots (CQD). The CQDs are synthesized via the simple hydrothermal route in the absence (C1) and presence (C2) of oxidants. The as-synthesized CQDs are amine functionalized using ethylenediamine. The amine functionalized CQDs (C1N and C2N) are explored for trinitrotoluene detection. From transmission electron microscopy, the average size of C1 and C2 was found to be about 4.2 nm and 5.6 nm respectively. The incorporation of amine groups lead to an increase in quantum yields from 5.63% to 12.7% for C1 and from 3.25% to 8.48% for C2 QDs. A limit of detection (LOD) of 13 ppb was displayed by C1N while the LODs of 11 ppb and 4.97 ppb were delivered by C2N at ?ex 370 nm and ?ex 420 nm respectively. The Stern-Volmer constant for C1N is 2.02 × 106 M-1 while for C2N at ?ex 370 nm and ?ex 420 nm is 0.38 × 106 M-1 and 0.48 × 106 M-1 respectively. Furthermore, C1N presents high selectivity for TNT compared to C2N. Owing to their higher luminescence, C1N particles are successfully demonstrated for their applicability in intracellular TNT detection. © 2018 The Royal Society of Chemistry.
Citation: RSC Advances(2018), 8(57): 32684-32694
Issue Date: 2018
Publisher: Royal Society of Chemistry
ISSN: 20462069
Author Scopus IDs: 57194330109
Author Affiliations: Devi, S., Analytical Techniques Division, CSIR-CSIO, Chandigarh, 160030, India
Gupta, R.K., Indian Institute of Technology, Kanpur, Uttar Pradesh, India
Paul, A.K., DeshBhagat University Fatehgarh Sahib, Punjab, India
Kumar, V., Indian Institute of Tec
Corresponding Author: Tyagi, S.; Analytical Techniques Division, CSIR-CSIOIndia; email:
Appears in Collections:Journal Publications [BT]

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