It's All About Contacts

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Science  19 Oct 2001:
Vol. 294, Issue 5542, pp. 536-537
DOI: 10.1126/science.1065708

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A key requirement in molecular electronics studies is the ability to measure the conductivity of a single molecule. But as Hipps explains in his Perspective, such measurements are often more about contacts than about molecular conductivity. Depending on the experimental setup, DNA behaves like a semiconductor, insulator, or metal. Cui et al. have designed a method that overcomes some of these problems, opening the door to systematic, reliable, and reproducible studies of the molecule-contact interface.