Gold substrates film patterns

Fabrication of patterned magnetite films by soft lithography and thermal decomposition using Fe(acac)3 is also possible as described by Yang and coworkers . The modality to obtain such structures on gold substrates is illustrated in Scheme 8. The array size could be tuned by changing the dimension of patterns on poly(drmethylsiloxane) stamps, the concentration of Fe(acac)3 solution and the size of water droplets during the condensation process. 

The PMMA trench patterns (300 nm wide with 700 nm spacing) with different geometries were created on a gold substrate as follows. A 120 nm thick Au layer was evaporated onto a Si (100) wafer with 5 nm thick Cr as an adhesion layer. The PMMA resist with 150 nm thickness was spin-coated onto the Au substrate. EBL was used to write previously programmed patterns on the PMMA film. The exposed PMMA regions were developed using methyl isobutyl ketone solution and then treated by oxygen plasma for 5 seconds to remove the residual PMMA resist at the bottom of the PMMA trench. 

Octadecyltrichlorosilane-patterned Si surface in aqueous acetonitrile solution facilitated positive deposition to produce PPy film with a negative pattern, whereas negative deposition occurred in nonaqueous solution, resulting in a positive PPy pattern. The electrodeposition preferentially occurred on the exposed area of the gold substrate, even though the deposition on the octadecanthiol-covered area could not be prevented because of the hydrophobic-hydrophobic interaction. 

Often a need for patterning organic films exists that does not allow for a metal substrate, however, patterning systems found useful for thiolates on gold can be carried over to other substrates such as Si/Si02. The ease of preparation as well as the depth of understanding of these fundamental systems already firmly embedded... 

The AFM images acquired in contact mode show that pCP delivered a well-defined pattern of PEI to the reactive SAM (Fig. 12). The resulting thin films of PEI are nearly continuous, but their surfaces are not smooth at the nanometer scale (Fig. 12b). The roughness of these films is controlled in part by the surface topology of the polycrystalline gold substrate, and probably also by the presence of gel or dust particles in the PEI. Line analysis indicates that the aver-... 

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