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Gas-phase ion-mobility characterization of SAM-functionalized Au nanoparticles
D-H Tsai1, R A Zangmeister, L F Pease
1Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland, USA.
Langmuir : the ACS Journal of Surfaces and Colloids
|July 30, 2008
Summary
Electrospray-differential mobility analysis (ES-DMA) precisely sizes functionalized gold nanoparticles (Au-NPs). This method, after protocol optimization, accurately characterizes self-assembled monolayers on Au-NPs, revealing negligible surface curvature effects.
Area of Science:
- Nanotechnology
- Surface Chemistry
- Analytical Chemistry
Background:
- Gold nanoparticles (Au-NPs) are crucial in various applications.
- Accurate characterization of functionalized nanoparticles is essential.
- Electrospray-differential mobility analysis (ES-DMA) offers high-resolution sizing.
Purpose of the Study:
- To systematically examine functionalized Au-NPs using ES-DMA.
- To develop protocols for accurate size determination of Au-NPs.
- To investigate the formation and properties of self-assembled monolayers (SAMs) on Au-NPs.
Main Methods:
- Utilized electrospray-differential mobility analysis (ES-DMA) for nanoparticle sizing.
- Developed sample preparation and data correction protocols for ES-DMA.
- Employed gas-phase temperature-programmed desorption (TPD) to study SAMs on Au-NPs.
Main Results:
- ES-DMA discerned particle size changes below 0.3 nm for Au-NPs.
- Optimized protocols addressed interference from salt particle formation.
- Detected SAM formation on Au-NPs via mobility changes, enabling packing density extraction.
- TPD data yielded an Arrhenius factor of 1.0 x 10^11 s^-1 and activation energy of ~105 kJ/mol.
- Surface curvature effects on SAM binding energy were found to be negligible.
Conclusions:
- ES-DMA is a valuable tool for characterizing functionalized nanoparticles.
- The study provides insights into SAM formation and energetics on Au-NPs.
- Optimized ES-DMA protocols enhance the reliability of nanoparticle characterization.
