In addition to this, the coexistence of a few
larger nanoparticles may contribute to the secondary diffraction
spots, owing to the presence of twinned crystals (ESI, Fig. S6†).
The transformation of single crystalline AgNPs to multiple
twinned particles indicates that silver nuclei/particles formed at
the rst stage undergo Ostwald ripening in the second stage and
are transformed into larger silver nanoparticles, thus
completing the growth process