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The formation of gold nanoparticles using hydroquinone as a reducing agent through a localized pH change upon addition of NaOH to a solution of HAuCl4

Journal Article


Abstract


  • We demonstrate a rapid synthesis of gold nanoparticles using hydroquinone as a reducing agent under acidic conditions without the need for precursor seed particles. The nanoparticle formation process is facilitated by the addition of NaOH to a solution containing HAuCl4 and hydroquinone to locally change the pH; this enhances the reducing capability of hydroquinone to form gold nucleation centres, after which further growth of gold can take place through an autocatalytic mechanism. The stability of the nanoparticles is highly dependent on the initial solution pH, and both the concentration of added NaOH and hydroquinone present in solution. The gold nanoparticles were characterized by UV-visible spectroscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, atomic force microscopy, dynamic light scattering, and zeta potential measurements. It was found that under optimal conditions that stable aqueous suspensions of 20nm diameter nanoparticles can be achieved where benzoquinone, the oxidized product of hydroquinone, acts as a capping agent preventing nanoparticles aggregation. © 2010 Elsevier B.V.

Publication Date


  • 2010

Citation


  • Sirajuddin., Mechler, A., Torriero, A. A. J., Nafady, A., Lee, C. Y., Bond, A. M., . . . Bhargava, S. K. (2010). The formation of gold nanoparticles using hydroquinone as a reducing agent through a localized pH change upon addition of NaOH to a solution of HAuCl4. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 370(1-3), 35-41. doi:10.1016/j.colsurfa.2010.08.041

Scopus Eid


  • 2-s2.0-77957752262

Start Page


  • 35

End Page


  • 41

Volume


  • 370

Issue


  • 1-3

Abstract


  • We demonstrate a rapid synthesis of gold nanoparticles using hydroquinone as a reducing agent under acidic conditions without the need for precursor seed particles. The nanoparticle formation process is facilitated by the addition of NaOH to a solution containing HAuCl4 and hydroquinone to locally change the pH; this enhances the reducing capability of hydroquinone to form gold nucleation centres, after which further growth of gold can take place through an autocatalytic mechanism. The stability of the nanoparticles is highly dependent on the initial solution pH, and both the concentration of added NaOH and hydroquinone present in solution. The gold nanoparticles were characterized by UV-visible spectroscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, atomic force microscopy, dynamic light scattering, and zeta potential measurements. It was found that under optimal conditions that stable aqueous suspensions of 20nm diameter nanoparticles can be achieved where benzoquinone, the oxidized product of hydroquinone, acts as a capping agent preventing nanoparticles aggregation. © 2010 Elsevier B.V.

Publication Date


  • 2010

Citation


  • Sirajuddin., Mechler, A., Torriero, A. A. J., Nafady, A., Lee, C. Y., Bond, A. M., . . . Bhargava, S. K. (2010). The formation of gold nanoparticles using hydroquinone as a reducing agent through a localized pH change upon addition of NaOH to a solution of HAuCl4. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 370(1-3), 35-41. doi:10.1016/j.colsurfa.2010.08.041

Scopus Eid


  • 2-s2.0-77957752262

Start Page


  • 35

End Page


  • 41

Volume


  • 370

Issue


  • 1-3