An unexpected transformation of organic solvents into 2D fluorescent quantum dots during ultrasonication assisted liquid phase exfoliation

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dc.contributor.author Das, Saroj Kumar
dc.contributor.author Gawas, Ramchandra
dc.contributor.author Chakrabarty, Satadru
dc.contributor.author Harini, Gunda
dc.contributor.author Patidar, Rishabh
dc.contributor.author Jasuja, Kabeer
dc.date.accessioned 2019-09-25T12:21:58Z
dc.date.available 2019-09-25T12:21:58Z
dc.date.issued 2019-09
dc.identifier.citation Das, Saroj Kumar; Gawas, Ramchandra; Chakrabarty, Satadru; Harini, Gunda; Patidar, Rishabh and Jasuja, Kabeer, "An unexpected transformation of organic solvents into 2D fluorescent quantum dots during ultrasonication assisted liquid phase exfoliation", The Journal of Physical Chemistry C, DOI: 10.1021/acs.jpcc.9b03975, Sep. 2019. en_US
dc.identifier.issn 1932-7447
dc.identifier.issn 1932-7455
dc.identifier.uri https://doi.org/10.1021/acs.jpcc.9b03975
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/4842
dc.description.abstract Ultrasonication within organic solvents is widely used to exfoliate layered materials and produce two-dimensional (2D) nanostructures. Several 2D materials synthesized by such liquid phase exfoliation (LPE) approaches are reported to exhibit photoluminescence. In these approaches, it is presumed that while the 2D nanostructures are derived from the layered parent material undergoing delamination, the organic solvent serves as a dispersing medium. However, in this study, we show that the organic solvent also contributes towards formation of 2D nanostructures that are optically active. We show that that bare organic solvent, when exposed to ultrasonication, transforms into 2D photoluminescent carbon quantum dots (CQDs) that display blue, cyan, green, and yellow emissions depending upon the excitation wavelength. Although this finding is intuitive, it has remained unacknowledged in the design of experiments which require ultrasonication of layered materials in organic solvents. Our results suggest that optical properties of dispersions obtained by LPE embody a contribution not only from the 2D nanostructures derived from the layered material but also from the 2D CQDs that are formed as a natural result of the liquid medium being exposed to ultrasonication. We anticipate that this new physical insight would form an important addition to the guidelines for exfoliation and help in rightly inferring the optical properties of the 2D material dispersions produced by these methods.
dc.description.statementofresponsibility by Saroj Kumar Das, Ramchandra Gawas, Satadru Chakrabarty, Gunda Harini, Rishabh Patidar and Kabeer Jasuja
dc.language.iso en_US en_US
dc.publisher American Chemical Society en_US
dc.title An unexpected transformation of organic solvents into 2D fluorescent quantum dots during ultrasonication assisted liquid phase exfoliation en_US
dc.type Article en_US
dc.relation.journal The Journal of Physical Chemistry


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