Diegoli, S and Mendes, P. M. and Baguley, E. R. and Leigh, S. J. and Iqbal, P and Diaz, Y. R. Garcia and Begum, S and Critchley, K and Hammonds, G. D. and Evans, S. D. and Attwood, D and Jones, I. P. and Preece, J. A. (2006) PH-dependent gold nanoparticle self-organization on functionalized Si/SiO2 surfaces. JOURNAL OF EXPERIMENTAL NANOSCIENCE, 1 (3). pp. 333-353.
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The self-organization of citrate- and acrylate-stabilized gold nanoparticles onto SiO2/hydroxyl-, amino- and nitro-terminated surfaces was investigated as a function of pH. Bare clean Si/SiO2 substrates were used as the SiO2/hydroxyl-terminated surfaces and self-assembled monolayers (SAM) of (3-aminopropyl)trimethoxysilane (APTMS) and 3-( 4-nitrophenoxy)propyltrimethoxysilane ( NPPTMS) on Si/SiO2 were employed as the amino- and nitro-terminated surfaces, respectively. All the surfaces were fully characterized by contact angle, atomic force microscopy (AFM), ellipsometry and X-ray photoelectron spectroscopy (XPS). Citrate- and acrylate-stabilized gold nanoparticle stability was also investigated as a function of pH by UV-visible absorption spectroscopy and Z-potentiometry. The gold nanoparticle surface coverage of the substrates was independently estimated by AFM and XPS. The results show that colloid deposition on bare SiO2/OH surfaces and on NPPTMS monolayers is negligible with the exception of acrylate-stabilized gold nanoparticles which were found to be immobilized on nitro-terminated surfaces at pH lower than 3.5. Nevertheless, APTMS monolayers interact strongly with citrate- and acrylate-stabilized gold nanoparticles exhibiting a dependence of the surface coverage from the pH of the colloidal solution.
|Uncontrolled Keywords:||AFM; gold nanoparticles; nanostructures; self-organization; XPS|
|Subjects:||Material Science > Functional and hybrid materials|
Material Science > Nanochemistry
|Deposited By:||Farnush Anwar|
|Deposited On:||16 Jan 2009 11:13|
|Last Modified:||12 Feb 2009 17:19|
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