Mechanism of formation and stabilization of platinum nanoparticles in aqueous solvents

Abdulcadir S. Hussein; Pandiyan Murugaraj; Colin Rix; David Mainwaring

doi:10.1117/12.471966

13 November 2002 Mechanism of Formation and Stabilization of Platinum Nanoparticles in Aqueous Solvents

Abdulcadir S. Hussein, Pandiyan Murugaraj, Colin Rix, David Mainwaring

Proceedings Volume 4934, Smart Materials II; (2002) https://doi.org/10.1117/12.471966
Event: SPIE's International Symposium on Smart Materials, Nano-, and Micro- Smart Systems, 2002, Melbourne, Australia

Abstract

The mechanism of formation of platinum nanoparticles via chemical reduction of Na₂PtCl₄ in aqueous solution was investigated by UV-Visible Spectroscopy and Transmission Electron Microscopy. Sodium borohydride (NaBH₄) was used as the reducing agent, and tri-Sodium Citrate was used for stabilising the nanoparticles. It is possible to monitor various stages of the reduction process on an observable time scale when the Pt(II) solution is suitably aged. Under appropriate experimental conditions, the theoretically predicted plasmon resonance absorption peak from the well-dispersed Pt(s) nanoparticles is observed at 215nm for the Pt suspensions in citrate medium. It is found that an increased concentration of citrate stabilizer decreases the reaction rate, although there is only a narrow concentration range of stabilizer which produces a stable suspension with well-separated Pt(s) nanoparticles. This conclusion was also supported by the TEM observation of the nanoparticles, which had a very narrow size distribution (between 2 to 6nm).

Citation Download Citation

Abdulcadir S. Hussein, Pandiyan Murugaraj, Colin Rix, and David Mainwaring "Mechanism of Formation and Stabilization of Platinum Nanoparticles in Aqueous Solvents", Proc. SPIE 4934, Smart Materials II, (13 November 2002); https://doi.org/10.1117/12.471966

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