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Microcontact insertion printing
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10.1063/1.2457525
/content/aip/journal/apl/90/6/10.1063/1.2457525
http://aip.metastore.ingenta.com/content/aip/journal/apl/90/6/10.1063/1.2457525
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Figures

Image of FIG. 1.
FIG. 1.

(Color online) (a) Schematic of microcontact insertion printing on a 1-octanethiolate (C8) self-assembled monolayer (SAM) with an elastomeric stamp inked with 11-mercaptoundecanoic acid (MUDA). (Top) A C8 SAM was fabricated on a Au{111} substrate. (Middle) The stamp coated with MUDA was brought into contact with the substrate. (Bottom) MUDA transferred from the stamp to the substrate and inserted into the C8 SAM (only) where the stamp and substrate were in contact. (b) A field emission scanning electron microscope (FESEM) image of a patterned Au{111} substrate fabricated by using a poly(dimethylsiloxane) (PDMS) stamp with square posts at a pitch coated with MUDA that was stamped for . The high intensity squares correspond to areas where MUDA was inserted, and the low intensity background corresponds to the unaltered regions of C8 SAM. (c) A FESEM image of a patterned Au{111} substrate fabricated by double . Initially, the substrate was patterned with a PDMS stamp with square posts at a pitch coated with MUDA that was stamped for and then patterned with a PDMS stamp (rotated 45°) with square posts at a pitch coated with MUDA acid that was stamped for . The highest intensity areas are where the film was inserted with MUDA twice (see text). Both images were acquired with a LEO 1530 Gemini FESEM (Carl Zeiss, Inc., Oberkochen, Germany) with a primary electron beam energy of and a collection voltage of .

Image of FIG. 2.
FIG. 2.

(a) A scanning tunneling microscope (STM) image of a 1-octanethiolate (C8) self-assembled monolayer (SAM) formed on a Au{111} substrate via exposure to a solution of C8 for . The depressed features correspond to substrate vacancy islands. (b) A STM image of a two-component SAM of C8 and 1-dodecanethiolate (C12) on a Au{111} substrate fabricated by microcontact insertion printing with an unpatterned (flat) poly(dimethylsiloxane) stamp coated with C12 that was stamped for . The most protruding features originating at substrate defects correspond to C12, and the less protruding lattice areas correspond to C8. The most depressed regions correspond to substrate vacancy islands. Both images were acquired under ambient conditions using a custom beetle-style (Ref. 24) at a sample bias of and tunneling currents of 3 and in (a) and (b), respectively.

Image of FIG. 3.
FIG. 3.

Matrix of representative scanning tunneling microscope (STM) images of microcontact insertion printed 1-octanethiolate (C8) self-assembled monolayers with an unpatterned stamp coated with 1-dodecanethiol (C12) molecules as a function of stamp dwell time (increasing from left to right) and C12 concentration (increasing from top to bottom). The most protruding features originating at substrate defects correspond to C12, and the less protruding lattice corresponds to C8. The most depressed regions correspond to substrate vacancy islands. The percentage in the upper right corner of each image was the calculated average fractional C12 coverage. All STM images were acquired under ambient conditions at a sample bias of and tunneling currents between 1 and . All imaged areas are .

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/content/aip/journal/apl/90/6/10.1063/1.2457525
2007-02-09
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Microcontact insertion printing
http://aip.metastore.ingenta.com/content/aip/journal/apl/90/6/10.1063/1.2457525
10.1063/1.2457525
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