Chemical fabrication of heterometallic nanogaps for molecular transport junctions

Xiaodong Chen, Sina Yeganeh, Lidong Qin, Shuzhou Li, Can Xue, Adam Braunschweig, George C. Schatz, Mark A. Ratner, Chad A. Mirkin

Research output: Contribution to journalArticle

85 Citations (Scopus)

Abstract

We report a simple and reproducible method for fabricating heterometallic nanogaps, which are made of two different metal nanorods separated by a nanometer-sized gap. The method is based upon on-wire lithography, which is a chemically enabled technique used to synthesize a wide variety of nanowire-based structures (e.g., nanogaps and disk arrays). This method can be used to fabricate pairs of metallic electrodes, which exhibit distinct work functions and are separated by gaps as small as 2 nm. Furthermore, we demonstrate that a symmetric thiolterminated molecule can be assembled into such heterometallic nanogaps to form molecular transport junctions (MTJs) that exhibit molecular diode behavior. Theoretical calculations demonstrate that the coupling strength between gold and sulfur (Au-S) is 2.5 times stronger than that of Pt-S. In addition, the structures form Raman hot spots in the gap, allowing the spectroscopic characterization of the molecules that make up the MTJs.

Original languageEnglish (US)
Pages (from-to)3974-3979
Number of pages6
JournalNano Letters
Volume9
Issue number12
DOIs
StatePublished - Dec 9 2009
Externally publishedYes

Fingerprint

Fabrication
fabrication
Molecules
Nanorods
Sulfur
Gold
Lithography
Nanowires
Diodes
Metals
Wire
Electrodes
nanorods
molecules
nanowires
sulfur
lithography
diodes
wire
gold

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanical Engineering

Cite this

Chen, X., Yeganeh, S., Qin, L., Li, S., Xue, C., Braunschweig, A., ... Mirkin, C. A. (2009). Chemical fabrication of heterometallic nanogaps for molecular transport junctions. Nano Letters, 9(12), 3974-3979. https://doi.org/10.1021/nl9018726

Chemical fabrication of heterometallic nanogaps for molecular transport junctions. / Chen, Xiaodong; Yeganeh, Sina; Qin, Lidong; Li, Shuzhou; Xue, Can; Braunschweig, Adam; Schatz, George C.; Ratner, Mark A.; Mirkin, Chad A.

In: Nano Letters, Vol. 9, No. 12, 09.12.2009, p. 3974-3979.

Research output: Contribution to journalArticle

Chen, X, Yeganeh, S, Qin, L, Li, S, Xue, C, Braunschweig, A, Schatz, GC, Ratner, MA & Mirkin, CA 2009, 'Chemical fabrication of heterometallic nanogaps for molecular transport junctions', Nano Letters, vol. 9, no. 12, pp. 3974-3979. https://doi.org/10.1021/nl9018726
Chen X, Yeganeh S, Qin L, Li S, Xue C, Braunschweig A et al. Chemical fabrication of heterometallic nanogaps for molecular transport junctions. Nano Letters. 2009 Dec 9;9(12):3974-3979. https://doi.org/10.1021/nl9018726
Chen, Xiaodong ; Yeganeh, Sina ; Qin, Lidong ; Li, Shuzhou ; Xue, Can ; Braunschweig, Adam ; Schatz, George C. ; Ratner, Mark A. ; Mirkin, Chad A. / Chemical fabrication of heterometallic nanogaps for molecular transport junctions. In: Nano Letters. 2009 ; Vol. 9, No. 12. pp. 3974-3979.
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