POLANYI, John - University of Toronto - Department of Chemistry

研究领域

This laboratory's long-time interest in the molecular motions responsible for chemical reactions at surfaces has received a major impetus in recent times with the advent of Scanning Tunneling Microscopy, the principle diagnostic tool used by the group. The laboratory is unusual in having four Ultra High Vacuum Scanning Tuneling Microscopes (STM) at its disposal. With the aid of these instruments it is able to characterize the event of chemical reactions a-molecule-at-a-time at a variety of semi-conductor and metallic surfaces. A central finding is the localization of reaction close to the site at which the parent molecule (the reagent) physisorbs on the surface. This provides the basis for a method of maskless Molecular-Scale Imprinting, constituting a 'molecular printing press' in which the mobile molecular 'type' self-assembles, and subsequently permanently ‘imprints’ through localised chemical reaction with the underlying surface induced by heat, light or electrons. Novel mechanisms of self-assembly lead to such nano-structures as molecular corrals and switches. Studies of the imprinting step reveal detailed links between adsorbate geometry and reactivity. Experiment is supported in all cases by theory performed collaboratively with other research groups in Canada and the U.K.

近期论文

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Vibrational Excitation Induces Double-Reaction. Kai Huang, Lydie Leung, Tingbin Lim, Zhanyu Ning, and John C. Polanyi, ACS Nano, 8, 12468-12475 (2014). doi:10.1021/nn5053074 Molecular Dynamics of the Electron-Induced Reaction of Diiodomethane on Cu(110). Avisek Chatterjee, Fang Cheng, Lydie Leung, Miaomiao Luo, Zhanyu Ning, and John C. Polanyi, Journal of Physical Chemistry C, 118, 25525-25533 (2014). doi:10.1021/jp508014x How Adsorbate Alignment Leads to Selective Reaction. Fang Cheng, Wei Ji, Lydie Leung, Zhanyu Ning, John C. Polanyi and Chen-Guang Wang, ACS Nano, 8, 8669-8675 (2014). doi:10.1021/nn503721h Catalyzed Surface-Aligned Reaction, H(ad)+H2(ad)=H2(g)+H(ad) on Coinage Metals. Zhanyu Ning, John C. Polanyi, Zeitschrift für Physikalische Chemie, 227,1-10 (2013). doi:10.1524/zpch.2013.0413 Charge Delocalization Induces Reaction in Molecular Chains at a Surface. Zhanyu Ning, John C. Polanyi, Angewandte Chemie International Edition, 52, 320-324 (2013). doi:10.1002/anie.201207819 Single-Electron Induces Double-Reaction by Charge Delocalization. Kai Huang, Lydie Leung, Tingbin Lim, Zhanyu Ning, John C. Polanyi, Journal of the American Chemical Society, 135, 6220-6225(2013). doi:/10.1021/ja400612c Adsorbate Alignment in Surface Halogenation: Standing Up is Better than Lying Down. Kai Huang, Iain R McNab, John C. Polanyi, Jody (S. Y.) Yang, Angewandte Chemie International Edition, 51, 9061-9065 (2012). doi:10.1002/anie.201202772 Surface Aligned Reaction (SAR). Zhanyu Ning, John C. Polanyi, Journal of Chemical Physics, 137, 091706 (2012). doi:10.1063/1.4746803 A new strongly-bound chemisorption structure of benzene on Si(100). Krishnan R. Harikumar, John C. Polanyi, Amir Zabet-khosousi, Surface Science, 606, 1431-1434 (2012). doi:10.1016/j.susc.2012.05.007 Effect of Alkyl Chain-Length on Dissociative Attachment: 1-Bromoalkanes on Si(100)- c(4x2). Maryam Ebrahimi, Si Yue Guo, Kai Huang, Tingbin Lim, Iain R. McNab, Zhanyu Ning, John C. Polanyi, Mark Shapero, Jody (S. Y.) Yang, Journal of Physical Chemistry C, 116, 10129-10137 (2012). doi:10.1021/jp301773m Reaction dynamics at a metal surface; Halogenation of Cu(110). Alon Eisenstein, Lydie Leung, Tingbin Lim, Zhanyu Ning, John C. Polanyi, Faraday Discuss., 157, 337-353 (2012). doi:10.1039/C2FD20023F Localized reaction at a smooth metal surface: p-diiodobenzene at Cu(110). Lydie Leung, Tingbin Lim, Zhanyu Ning, John C. Polanyi, Journal of the American Chemical Society, 134, 9320-9326 (2012). doi:10.1021/ja301608q Pulsed-dosing controls self-assembly: 1-Bromopentane on Si(111)-7x7. Alon Eisenstein, K. R. Harikumar, Kai Huang, Iain R. McNab, John C. Polanyi, Amir Zabet-Khosousi, Chemical Physics Letters, 527, 1-6 (2012). doi:10.1016/j.cplett.2011.12.052 Stereo-isomerism controls surface reactivity; 1-chloropentane-pairs on Si(100)-2x1. K. R. Harikumar, Iain R McNab, John C. Polanyi, Amir Zabet-Khosousi, Chiara Panosetti, Werner A. Hofer. Chemical Communications, 47, 12101-12103 (2011). doi: 10.1039/c1cc14117a Directed long-range migratory reaction of benzene on Si(100). K. R. Harikumar, John C. Polanyi, Amir Zabet-Khosousi. Journal of Physical Chemistry C, 115, 22409-22414 (2011). doi: 10.1021/jp2066748 Facile charge-displacement at silicon gives spaced-out reaction. Maryam Ebrahimi, Kai Huang, Xuekun Lu, Iain R. McNab, John C. Polanyi, Zafar Waqar, Jody (S. Y.) Yang, Haiping Lin , Werner A. Hofer, Journal of the American Chemical Society, 133, 16560-16565 (2011). doi: 10.1021/ja205716t Molecular calipers control atomic separation at a metal surface. Lydie Leung, Tingbin Lim, John C. Polanyi, Werner A. Hofer, Nano Letters, 11 (10) 4113-4117 (2011). doi: 10.1021/nl2023788 Multiple pathways of dissociative attachment: CH3Br on Si(100)-2x1, Tingbin Lim, Iain R. McNab, John C. Polanyi, Hong Guo, Wei Ji, Journal of the American Chemical Society, 133, 11534-11539 (2011). doi:10.1021/ja201060z Imprinting atomic and molecular patterns. Iain R. McNab, John C. Polanyi, Chapter 4, Atomic and molecular manipulation. Volume Editors Andrew J. Mayne and Gerald Dujardin, 'Frontiers of nanoscience' Series, General Ed. R. Palmer, pp 79-120 (2011). doi:10.1016/B978-0-08-096355-6.00004-0 Directed long-range molecular migration, energized by surface reaction. K. R. Harikumar, John C. Polanyi, Amir Zabet-Khosousi, Piotr Czekala, Haiping Lin and Werner A. Hofer, Nature Chemistry, 3, 400-408 (2011). doi:10.1038/nchem.1029; doi:10.1038/nchem.1035 Imprinting self-assembled patterns of lines at a semiconductor surface, using heat, light, or electrons. K. R. Harikumar, Iain R. McNab, John C. Polanyi, Amir Zabet-Khosousi, Werner A. Hofer, Proceedings of the National Academy of Sciences, 108, 950-955 (2011). doi:10.1073/pnas.1006657107