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