Using constant-wavelength synchronous fluorescence spectroscopy in nanoparticle-based sensors: a minireview

This study focuses on optical nanosensors based on constant-wavelength synchronous fluorescence spectroscopy (SFS) and reviews their applications for analysis purposes in the last few decades. In comparison to conventional fluorescence, SFS shows a higher selectivity owing to the narrowing of spectral bands and the simplification of spectra. The reported SFS-based nanosensors are classified based on their mechanism for analyte detection into two types including quenching based methods and enhancement based methods. Herein, almost all studies performed in this field are reviewed and the details of each study are carefully explained. Moreover, the analytical properties of the reported nanosensors are tabulated in relevant tables. It is hoped that this study will stimulate further investigations in this field with similar nanosensors.