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Soft lithographic printing of patterns of stretched DNA and DNA/electronic polymer wires by surface-energy modification and transfer
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics . Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics . Linköping University, The Institute of Technology.
2006 (English)In: Small, ISSN 1613-6810 (print), 1613-6829 (online), Vol. 2, no 8-9, 1068-1074 p.Article in journal (Refereed) Published
Abstract [en]

Aligned and stretched λ DNA is directed to specific locations on solid substrates. Surface-energy modification of glass substrates by using patterned polydimethylsiloxane (PDMS) stamps is used to direct DNA onto the surface-energy-modified micrometer-scale pattern through molecular combing. As an alternative, patterned and nonpatterned PDMS stamps modified with polymethylmethacrylate (PMMA) are utilized to direct the stretched DNA to the desired location and the results are compared. The DNA is elongated through molecular combing on the stamp and transfer printed onto the surfaces. PMMA-modified stamps show a more defined length of the stretched DNA, as compared to bare PDMS stamps. A combination of these two methods is also demonstrated. As an application example, transfer printing of DNA decorated with a semiconducting conjugated polyelectrolyte is shown. The resulting patterned localization of stretched DNA can be utilized for functional nanodevice structures, as well as for biological applications.

Place, publisher, year, edition, pages
2006. Vol. 2, no 8-9, 1068-1074 p.
Keyword [en]
conjugation, DNA, lithography, patterning, polymers
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-12728DOI: 10.1002/smll.200600126OAI: diva2:16930
Available from: 2007-12-07 Created: 2007-12-07
In thesis
1. Biological Sensing and DNA Templated Electronics Using Conjugated Polymers
Open this publication in new window or tab >>Biological Sensing and DNA Templated Electronics Using Conjugated Polymers
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Conjugated polymers have been found useful in a wide range of applications such as solar cells, sensor elements and printed electronics, due to their optical and electronic properties. Functionalization with charged side chains has enabled water solubility, resulting in an enhanced interaction with biomolecules. This thesis focus on the emerging research fields, where these conjugated polyelectrolytes (CPEs) are combined with biomolecules for biological sensing and DNA nanowire assembling.

CPEs have shown large potential in biomolecular detection where the optical read out is due to the geometrical alternation in the backbone and aggregation state. This thesis focused on transferring the biomolecular detection to a surface of CPEs. The characterization of the CPE layer show that a hydrogel can be formed, and how the layer can undergo geometrical changes upon external stimulus such as pH change. A selective sensor surface can be created by imprinting ssDNA or an antibody in the CPE layer. The discrimination for complementary DNA hybridization and specific antibody interaction can be monitored by surface plasmon resonance or quartz crystal microbalance. We have also taken the step out from the controlled test tube experiments to the complex environment of the cell showing the potential for staining of compartments and structures in live and fixed cell. Depending on the conditions and CPE used, cell nuclei, acidic vesicles and cytoskeleton structure can be visualized. Furthermore, the live staining shows no sign of toxic effect on cultured fibroblasts.

CPEs can also be a valuable element when assembling electronics in the true nano regime. I have used DNA as building template due to its attractive size features, with a width of around 2 nm and a length scale in the µm regime, and the inbuilt base-paring recognition elements. This thesis shows how DNA can be decorated with CPEs and stretched on surfaces into a model for aligned semiconducting nanowire geometries. Not only making the template structures is of importance, but also how to place them on the correct surface position, i.e. on electrodes. Strategies for positioning DNA nanowires using transfer printing and surface energy patterning methods have therefore been developed in the thesis. The stretched DNA decorated with CPE also offers a way to further study the molecular binding interaction between the two molecules. Single molecular spectroscopy in combination with polarization has given information of the variation of the CPE binding along a DNA chain.

Place, publisher, year, edition, pages
Institutionen för fysik, kemi och biologi, 2007
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1154
conjugated polymer, conjugated polyelectrolyte, DNA, sensor, nanowire
National Category
Industrial Biotechnology
urn:nbn:se:liu:diva-10180 (URN)978-91-85895-17-5 (ISBN)
Public defence
2007-12-14, Planck, Fysikhuset, Campus Valla, Linköpings Universitet, Linköping, 10:15 (English)
Available from: 2007-12-07 Created: 2007-12-07 Last updated: 2009-04-23

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Björk, PerInganäs, Olle
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Biomolecular and Organic Electronics The Institute of Technology
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