journal article Nov 03, 2010

Super Gas Barrier of Transparent Polymer−Clay Multilayer Ultrathin Films

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Using a USB2000 UV-Vis spectrometer (Ocean Optics, Dunedin, FL), thin film absorbance was monitored at wavelengths between 190 and 900 nm. Fused quartz slides (Structure Probe Inc., West Chester, PA) were used as substrates for UV−vis characterization.
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Thin film cross sections were imaged at calibrated magnifications using a JEOL 1200EX (Parbody, MA) transmission electron microscope at an accelerating voltage of 100 kV. Carbon stabilized, Formvar coated 150 mesh nickel grids (Electron Microscopy Sciences, Hatlfield, PA) and polystyrene film with a thickness of 250 μm (Goodfellow, Huntington, England) were used for TEM. PS and PET(39)substrates were prepared for deposition by rinsing with deionized water, methanol, and water again before being dried with filtered air. PS substrates were then plasma cleaned prior to film deposition.(35)Prior to imaging, films deposited onto PS were coated with carbon on one side, embedded in epoxy prior to sectioning, and floated on ethylene glycol.
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