Au−Ag Template Stripped Pattern for Scanning Probe Investigations of DNA Arrays Produced by Dip Pen Nanolithography

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• 作者：Andrea Baserga ; Marco Viganò ; Carlo S. Casari ; Stefano Turri ; Andrea Li Bassi ; Marinella Levi ; Carlo E. Bottani
• 刊名：Langmuir
• 出版年：2008
• 出版时间：November 18, 2008
• 年：2008
• 卷：24
• 期：22
• 页码：13212-13217
• 全文大小：372K
• 年卷期：v.24,no.22(November 18, 2008)
• ISSN：1520-5827

文摘

We report on DNA arrays produced by dip pen nanolithography (DPN) on a novel Au−Ag micropatterned template stripped surface. DNA arrays have been investigated by atomic force microscopy (AFM) and scanning tunneling microscopy (STM) showing that the patterned template stripped substrate enables easy retrieval of the DPN-functionalized zone with a standard optical microscope permitting multi-instrument and multitechnique local detection and analysis. Moreover the smooth surface of the Au squares (∼5−10 Å roughness) allows AFM/STM to be sensitive to the hybridization of the oligonucleotide array with label-free target DNA. Our Au−Ag substrates, combining the retrieving capabilities of the patterned surface with the smoothness of the template stripped technique, are candidates for the investigation of DPN nanostructures and for the development of label-free detection methods for DNA nanoarrays based on the use of scanning probes.