Formation and characterization of crystalline iron oxide films on self-assembled organic monolayers and their in situ pa
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Y. Eugene Pak Micro Electro-Mechanical System (MEMS) Laboratory, Samsung Advanced Institute of Technology, P.O. Box 111, Suwon, Korea
Hyejin Im Department of Ceramic Engineering, YonSei University, Seoul, Korea
Eung Soo Kim Department of Materials Engineering, Kyonggi University, Suwon, Korea (Received 14 July 2000; accepted 14 November 2000)
Crystalline and pore-free films of ␣–Fe2O3 were prepared on hydrophilic self-assembled organic monolayers (DTT-SAMs) at 80 °C. Subsequently, Fe3O4 and ␥–Fe2O3 films were synthesized via post annealing of as-deposited ␣–Fe2O3. In situ patterning of crystalline iron oxide thin layers was achieved via microcontact printing (CP) and selective deposition. CP was used to pattern two different surface moieties of self-assembled organic monolayers (SAMs) on Au–Cr–Si substrates. An elastomeric stamp was used to transfer either hexadecanethiol (HDT) SAMs, which are to sustain deposition of iron oxide precipitates, or hydrophilic SAMs [e.g., dithiothreitol (DTT)]. Selective deposition was realized through precipitation of iron oxide phases. Iron oxide films were deposited onto hydrophilic SAMs, but not onto HDT surfaces. Line (width of
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