A comparative study of morphology, reactivity and stability of synthesized silver nanoparticles using Bacillus subtilis and Catharanthus roseus (L.) G. Don

► Absorbance, reaction time and reactivity have influence on the particle size and stability. ► It is not known, whether S1 forms isolated particles or agglomerates? We found S1 forms agglomerates. ► Morphology of S1 shows predominantly triangular or hexagonal shaped agglomerates. ► The S2 particles were in the range of 45-70 nm and were stable for even four months. ► By varying biological reductants the particle size may be controlled.