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Pyrolysis of self-assembled organic monolayers on oxide substrates

  • Hyunjung Shin (a1), Yuhu Wang (a1), Uma Sampathkumaran (a1), Mark R. De Guire (a1), Arthur H. Heuer (a1) and Chaim N. Sukenik (a2)...

Abstract

The pyrolysis of siloxy-anchored, organic self-assembled monolayers (SAMs) on oxide substrates [titanium dioxide powder; hydrolyzed silicon dioxide on (100) silicon] was studied using x-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), and mass spectroscopy (MS). Pyrolysis in air began on heating at 200 °C and was complete by 400 °C for both octadecyltrichlorosilane (OTS) and C16-thioacetate (TA) SAMs, as observed in TGA of SAM-coated TiO2 powders, and in XPS studies of TA-SAM-coated TiO2 powders and Si wafers after various heat treatments. In low-oxygen environments, pyrolysis of SAMs began at higher temperatures: between 250 and 400 °C for heating in ultrahigh vacuum (10−8 Torr) as observed in XPS studies of TA-SAMs on Si, and between 300 and 400 °C in nitrogen, as observed in TEM analysis of sulfonate SAMs under a TiO2 thin film on Si substrates.

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Pyrolysis of self-assembled organic monolayers on oxide substrates

  • Hyunjung Shin (a1), Yuhu Wang (a1), Uma Sampathkumaran (a1), Mark R. De Guire (a1), Arthur H. Heuer (a1) and Chaim N. Sukenik (a2)...

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