Design and control of electron transport properties of single molecules
2009 (English)In: Proceedings of the National Academy of Sciences of the United States of America, ISSN 0027-8424, E-ISSN 1091-6490, Vol. 106, no 36, 15259-15263 p.Article in journal (Refereed) Published
We demonstrate in this joint experimental and theoretical study how one can alter electron transport behavior of a single melamine molecule adsorbed on a Cu (100) surface by performing a sequence of elegantly devised and well-controlled single molecular chemical processes. It is found that with a dehydrogenation reaction, the melamine molecule becomes firmly bonded onto the Cu surface and acts as a normal conductor controlled by elastic electron tunneling. A current-induced hydrogen tautomerization process results in an asymmetric melamine tautomer, which in turn leads to a significant rectifying effect. Furthermore, by switching on inelastic multielectron scattering processes, mechanical oscillations of an N-H bond between two configurations of the asymmetric tautomer can be triggered with tuneable frequency. Collectively, this designed molecule exhibits rectifying and switching functions simultaneously over a wide range of external voltage.
Place, publisher, year, edition, pages
2009. Vol. 106, no 36, 15259-15263 p.
hydrogen tautomerization, melamine molecules, rectifying effect, switching property, negative differential-resistance, scanning tunneling microscope, total-energy calculations, wave basis-set, conformational-changes, azobenzene, dissociation, efficiency, melamine, device
IdentifiersURN: urn:nbn:se:kth:diva-18741DOI: 10.1073/pnas.0903131106ISI: 000269632400033ScopusID: 2-s2.0-70349304456OAI: oai:DiVA.org:kth-18741DiVA: diva2:336788
QC 201005252010-08-052010-08-052011-05-24Bibliographically approved