Scheme xA The routes of synthesis of compound probe Figure

AgNCs show excellent photophysical properties such as good photostability, high photoluminescence and large Stokes shift [28]. Basically, the size of silver nanoclusters is found between silver atoms and silver nanoparticles which is close to the Femi wavelength of electrons, ca. 0.5 nm [29]. Therefore, a molecular like phenomenon is dominated from discrete energy levels [30], resulting in size-dependent luminescence and exhibiting better optical properties compared to silver nanoparticles [31].