Shape-Controlled Generation of Gold Nanoparticles Assisted by Dual-Molecules: The Development of Hydrogen Peroxide and Oxidase-Based Biosensors

Figure 1

GNP solutions generated in different buffers. (a) Photograph showing the reaction solution. (b) Absorbance values (540 nm) of GNP solutions as a function of H₂O₂ concentration. Reaction condition: (A) 0.45 mM HAuCl₄ and 1.0 mM MES (pH = 6.5); (B) 0.45 mM HAuCl₄, 2.4 mM sodium citrate, and 1.0 mM MES (pH = 6.5); (C) 0.45 mM HAuCl₄, 2.4 mM sodium citrate, and water; (D) 0.45 mM HAuCl₄, 2.4 mM sodium citrate, and 1.0 mM PB (pH = 6.5); (E) 0.45 mM HAuCl₄, 2.4 mM sodium citrate, and 1.0 mM Tris (pH = 6.5).

(a)

(b)