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has been cited by the following article:

• TITLE: Studies on the Effect of the Capping Materials on the Spherical Gold Nanoparticles Catalytic Activity

  AUTHORS: Roshdi Seoudi, Doaa A. Said

  KEYWORDS: Gold Nanoparticle, Catalytic Activity, TEM, UV-VIS Spectroscopy

  JOURNAL NAME: World Journal of Nano Science and Engineering, Vol.1 No.2, June 29, 2011

  ABSTRACT: Size-controlled gold nanoparticles (AuNPs) were prepared in the presence of different capping materials (sodium citrate, cetyltrimethylammonium bromide (CTAB), and chitosan). The results obtained suggest that the AuNPs were synthesized with different particle size, which is controlled by changing the molar ratio between sodium citrate, (CTAB), and chitosan to Au (III). The catalytic activities of the AuNPs with different capping materials were studied for 4-nitrophenol reduction by NaBH4 as a model reaction. AuNPs with different capping materials is comparable from the value of the apparent rate constant of 4-nitrophenol reduction (0.6 × 10–3, 1.9 × 10–3, and 2.4 × 10–3 s–1) for sodium citrate, CTAB and chitosan. From the results, it is concluded that, AuNPs catalyzed the electron transfer process between and nitro compounds with all the capping materials used AuNPs capped by chitosan were more active for the reduction than the other two.