Article ; Online: Solubility tuning of alkyl amine functionalized carbon quantum dots for selective detection of nitroexplosive
Carbon. 2023 June, v. 209, p. 117972
2023 , Page(s) 117972
Abstract: The major issue of luminescent carbon quantum dots (CQDs) is the solubility in wide range of solvent and disappearance of luminescence behavior in its solid state due to aggregation caused quenching. To resolve this issue, in the present work, we have ... ...
| Abstract | The major issue of luminescent carbon quantum dots (CQDs) is the solubility in wide range of solvent and disappearance of luminescence behavior in its solid state due to aggregation caused quenching. To resolve this issue, in the present work, we have tuned the solubility of carbon quantum dots in different kinds of solvents through surface functionalization technique. Here, we have synthesized three sets of alkyl amine functionalized carbon quantum dots from citric acid and alkyl amine by solvothermal method. We have observed that the solubility of CQDs increases from aqueous medium to organic medium with increasing length of hydrophobic alkyl chains attached at the surface of CQDs. It is seen that n-butyl amine functionalized CQDs (C₄-CQD) are soluble in any type of solvents. Here we have also observed that the C₄-CQD shows aggregation induced emission instead of aggregation caused quenching in solid state and shows bright yellow luminescence color upon excitation. Besides this, we also report selective detection of both dinitroaniline (DNA) and dinitrophenol (DNP) using this C₄-CQD via fluorescence quenching and colorimetric methods. In organic medium both shows significant quenching with emission peak of carbon quantum dots is red shifted (∼30 nm) in presence of DNP whereas no significant peak shift is observed for DNA. CQDs containing paper strip shows yellow spot in presence of DNP but no such characteristic color is appeared after addition of DNA. Using these two techniques, we have selectively identified both DNA and DNP among other nitro compounds by our as-synthesized carbon dots. |
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| Keywords | DNA ; carbon ; citric acid ; color ; colorimetry ; fluorescence ; hydrophobicity ; paper ; solubility ; solvents ; Carbon quantum dots ; Alkyl amine functionalization ; Solid state luminescence ; Fluorescence quenching ; Colorimetric detection |
| Language | English |
| Dates of publication | 2023-06 |
| Size | p. 117972 |
| Publishing place | Elsevier Ltd |
| Document type | Article ; Online |
| Note | Pre-press version |
| ISSN | 0008-6223 |
| DOI | 10.1016/j.carbon.2023.03.047 |
| Database | NAL-Catalogue (AGRICOLA) |
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