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Micron and Submicron Patterning of Dicyanopyrazine-Linked Porphyrin Molecules Using Micro-Contact Printing and Langmuir-Blodgett Assembly

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Abstract:

We describe a method to conveniently fabricate micron- and submicron-sized patterns of well-ordered and densely-packed dicyanopyrazine-linked porphyrin (4-TDCPP) molecules by using micro-contact printing (-CP) in conjunction with Langmuir-Blodgett (LB) deposition. SEM and AFM images reveal that the sizes and shapes of the 4-TDCPP patterns are well-matched with the geometric features of the polydimethylsiloxane (PDMS) stamps used for -CP. Fluorescence images show strong, red emission from the 4-TDCPP patterns. However, the thicknesses of the 4-TDCPP patterns transferred onto a silicon substrate by -CP are not the same, even though the same amount of 4-TDCPP layers are deposited on the surface of PDMS stamps in the LB process. The thicknesses of the 10 m line, 2 m dot and 300 nm line patterns of 10-layered 4-TDCPP molecules are 34.6, 26.7 and 5.9 nm, respectively. These differences may be due to variations in adhesion forces between the silicon substrate and 4-TDCPP on PDMS stamps having different size patterns. Larger patterns have greater contact areas compared to smaller patterns. This phenomenon can cause stronger adhesion forces, resulting in greater pattern thickness.

Keywords: DICYANOPYRAZINE; LANGMUIR-BLODGETT; MICRO-CONTACT PRINTING; PORPHYRIN; SENSOR

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2010.2864

Publication date: November 1, 2010

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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