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(a) Schematic of the TNT sensor by Shiraki et al. Positive charges from the amino groups on the QD surface ligands interact with negative charges on the TNT molecule, causing the QDs to aggregate. Schematic is not drawn to scale; (b) PL spectra of the sensor with both sizes of QD populations. The arrows indicate how the PL intensity of the donor and acceptors change with increasing analyte concentration. (b) reprinted with permission from [101].
