Fig. 1.

Characterisation of nanoparticles

(a) Synthesis of GK‐(Ag–Au) NP using soluble GK, AgNO₃ and HAuCl₄. GK‐(Ag–Au) NP shows a characteristic absorbance at 520 nm. (b) (i) Soluble gum (ii) after nanoparticle formation. The soluble gum solution turns to purple colour after the formation of GK‐(Ag–Au) NP (c) . Effect of reaction time (0–60 min) on GK‐(Ag–Au) NP formation. Maximum absorbance was observed at 30 min. (d) . Effect of temperature (25–95°C) on GK‐(Ag–Au) NP. Temperature had no effect on the nanoparticles