by Lidong Qin, Sungho Park, Ling Huang, and Chad A. Mirkin

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Presentation transcript:

by Lidong Qin, Sungho Park, Ling Huang, and Chad A. Mirkin On-Wire Lithography by Lidong Qin, Sungho Park, Ling Huang, and Chad A. Mirkin Science Volume 309(5731):113-115 July 1, 2005 Published by AAAS

Scheme 1. OWL methodology. Lidong Qin et al. Science 2005;309:113-115 Published by AAAS

Fig. 1. FESEM images of multisegment metallic Au-Ag nanowires (A) before and (B) after coating with a bilayer consisting of 10 nm of Ti and 40 nm of Au and subsequent wet-chemical etching of the Ag segments. FESEM images of multisegment metallic Au-Ag nanowires (A) before and (B) after coating with a bilayer consisting of 10 nm of Ti and 40 nm of Au and subsequent wet-chemical etching of the Ag segments. Insets show magnified images. (C) Side view of a nanogap wire with gap sizes of 25, 50, and 100 nm. Multisegment metallic Au-Ni nanowires (D) before and (E) after coating one side with 50 nm of silica and subsequent wet-chemical etching of the Ni segments. Each Au and Ni segment length is 40 nm. Insets are magnified images. (F) An Au nanowire with a 5-nm gap. Every nanowire in the batch has a well-defined gap. Lidong Qin et al. Science 2005;309:113-115 Published by AAAS

Fig. 2. (A) Current-voltage measurements on the wires with nanogaps. (A) Current-voltage measurements on the wires with nanogaps. The green line is before functionalization of the gap with PPy/PEO by DPN, and the red line is after it has been filled with the polymer mixture. The inset describes the DPN process. The red arrows indicate the observed conductivity change under Xe light irradiation. e, electrons. (B) Images of Au wires with 13-nm gaps. In the center of each wire, the dark lines are the nanogaps. The contrast depends on which side is facing out because of the silica coating. The left inset is a magnified FESEM image of a 13-nm gap, and the right inset is a magnified transmission electron microscopy image, which shows the transparent gap. (C) An FESEM image of a wire with a 13-nm gap, which is immobilized on microelectrodes and filled with PPy/PEO. (Inset) An image that shows clear contrast between the clean gold surface and the polymer-covered area, including the gap. The contrast is a result of differences in substrate charging due to the presence of organic polymer. Lidong Qin et al. Science 2005;309:113-115 Published by AAAS