Facile and One Pot Synthesis of Gold Nanoparticles Using Tetraphenylborate and Polyvinylpyrrolidone for Selective Colorimetric Detection of Mercury Ions in Aqueous Medium

Figure 1

UV-vis spectra of AuNPs of various concentration (a) 0.25×10⁻³, (b) 0.50×10⁻³, (c) 0.75×10⁻³, (d) 1.00×10⁻³, and (e) 2.00×10⁻³ M of HAuCl₄ solution using 1×10⁻³ M TPB as reductant. Inset. Photographic images show different colors of AuNPs in various concentrations such as (a) 0.25×10⁻³ M, (b) 0.50×10⁻³ M, (c) 0.75×10⁻³ M, (d) 1.00×10⁻³ M, and (e) 2.00×10⁻³ M of HAuCl₄ solution using 1×10⁻³ M TPB as reductant.