Spectroscopically characterized cadmium sulfide quantum dots lengthening the lag phase of Escherichia coli growth

► In this study we have synthesized cadmium sulfide (CdS) quantum dots. ► Varying concentration of MPA leads to the production of different sized quantum dots. ► With the increasing size the fluorescence peak shifted to right. ► The largest synthesized particles significantly elongate the lag phase growth of E. coli.