This rise of the D band with the increase of the urea concentration indicates that the addition of a high urea concentration to the reaction introduced an sp 3 hybridized structure-containing oxygen species in an increasing trend.
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Insight into the photophysics of strong dual emission (blue & green) producing graphene quantum dot clusters and their application towards selective and sensitive detection of trace level Fe<sup>3+</sup> and Cr<sup>6+</sup> ions.
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