pH-Dependent gold nanoparticle self-organization on functionalized Si/SiO2surfaces

S. Diegoli, P. M. Mendes, E. R. Baguley, S. J. Leigh, P. Iqbal, Y. R. Garcia Diaz, S. Begum, K. Critchley, G. D. Hammond, S. D. Evans, D. Attwood, I. P. Jones, J. A. Preece

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    35 Citations (Scopus)


    The self-organization of citrate- and acrylate-stabilized gold nanoparticles\nonto SiO2/hydroxyl-, amino- and nitro-terminated surfaces was investigated\nas a function of pH. Bare clean Si/SiO2 substrates were used as the\nSiO2/hydroxyl-terminated surfaces and self-assembled monolayers (SAM)\nof (3-aminopropyl)trimethoxysilane (APTMS) and 3-( 4-nitrophenoxy)propyltrimethoxysilane\n( NPPTMS) on Si/SiO2 were employed as the amino- and nitro-terminated\nsurfaces, respectively. All the surfaces were fully characterized\nby contact angle, atomic force microscopy (AFM), ellipsometry and\nX-ray photoelectron spectroscopy (XPS). Citrate- and acrylate-stabilized\ngold nanoparticle stability was also investigated as a function of\npH by UV-visible absorption spectroscopy and Z-potentiometry. The\ngold nanoparticle surface coverage of the substrates was independently\nestimated by AFM and XPS. The results show that colloid deposition\non bare SiO2/OH surfaces and on NPPTMS monolayers is negligible with\nthe exception of acrylate-stabilized gold nanoparticles which were\nfound to be immobilized on nitro-terminated surfaces at pH lower\nthan 3.5. Nevertheless, APTMS monolayers interact strongly with citrate-\nand acrylate-stabilized gold nanoparticles exhibiting a dependence\nof the surface coverage from the pH of the colloidal solution.
    Original languageEnglish
    Pages (from-to)333-353
    Number of pages21
    JournalJournal of Experimental Nanoscience
    Issue number3
    Publication statusPublished - 3 Sept 2006


    • AFM
    • Gold nanoparticles
    • Nanostructures
    • Self-organization
    • XPS


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