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Oxide Nanofilms from Nanoparticle Suspensions Deposited on Functionalized Surfaces

Wiley, Devon S.
http://rave.ohiolink.edu/etdc/view?acc_num=case1217022473

Abstract Details

2008, Master of Sciences (Engineering), Case Western Reserve University, Materials Science and Engineering.
Single-crystal silicon wafers, with and without self-assembled organic monolayersurface treatments (amine or sulfonate) were immersed in commercially available oxide nanoparticle suspensions (alumina, ceria, or titania). These specimens allowed the study of the interactions of oxide nanoparticles with functionalized substrates in the presence of a non-reactive aqueous liquid. They therefore represented models of chemical bath deposition (CBD) and liquid-phase deposition (LPD) processes, with the difference that the model systems lacked the continually changing pH, concentration, and particle number and size distributions typical of most CBD and LPD processes. Electrostatic arguments were used to predict the ability of the nanoparticle suspensions to deposit continuous films on functionalized substrates. These predictions were based on the simple assumption that a pH value of the suspension between the isoelectric point (IEP) of the particle and the IEP of the functionalized substrate would provide surfaces of opposite charge and provide the necessary attractive force to initiate film growth. These predictions were correct in 15 of 18 specimens studied, including positive and negative outcomes over the three different oxides and three different substrates. All sample depositions were investigated with x-ray photoelectron spectroscopy (XPS) to determine elemental composition at the surface, atomic force microscopy (AFM) for topographic observation, nanoscratch for thickness determination and scanning electron microscopy (SEM) for morphology. Successful film thicknesses ranged from 6.1 nm to 53 nm over deposition times of 15 and 30 h. Results were compared with literature data from chemical bath deposition. While the nanoparticle suspensions may serve as a suitable model for early CBD film deposition, it is conjectured that the non-reacting suspensions do not possess the means to sustain continued film growth. 6
Mark De Guire, R (Advisor)
James McGuffin-Cawley, PhD (Committee Member)
Harold Kahn, PhD (Committee Member)
95 p.
Materials Science
Nanoparticle; DLVO; Colloid particles; SAMs; Isoelectric Point; Zeta Potential

Recommended Citations

Citations

  • Wiley, D. S. (2008). Oxide Nanofilms from Nanoparticle Suspensions Deposited on Functionalized Surfaces [Master's thesis, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1217022473

    APA Style (7th edition)

  • Wiley, Devon. Oxide Nanofilms from Nanoparticle Suspensions Deposited on Functionalized Surfaces. 2008. Case Western Reserve University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1217022473.

    MLA Style (8th edition)

  • Wiley, Devon. "Oxide Nanofilms from Nanoparticle Suspensions Deposited on Functionalized Surfaces." Master's thesis, Case Western Reserve University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=case1217022473

    Chicago Manual of Style (17th edition)

case1217022473
1,892
© 2008, all rights reserved.
This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.