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Your search keyword '"Lambert, Colin J."' showing total 25 results
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25 results on '"Lambert, Colin J."'

3. Exploring the thermoelectric properties of oligo(phenylene-ethynylene) derivatives

Author

Chen, Hang, primary, Sangtarash, Sara, additional, Li, Guopeng, additional, Gantenbein, Markus, additional, Cao, Wenqiang, additional, Alqorashi, Afaf, additional, Liu, Junyang, additional, Zhang, Chunquan, additional, Zhang, Yulong, additional, Chen, Lijue, additional, Chen, Yaorong, additional, Olsen, Gunnar, additional, Sadeghi, Hatef, additional, Bryce, Martin R., additional, Lambert, Colin J., additional, and Hong, Wenjing, additional

Published
2020
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4. Cross-conjugation increases the conductance of meta-connected fluorenones

Author

Alanazy, Asma, primary, Leary, Edmund, additional, Kobatake, Takayuki, additional, Sangtarash, Sara, additional, González, M. Teresa, additional, Jiang, Hua-Wei, additional, Bollinger, Gabino Rubio, additional, Agräit, Nicolás, additional, Sadeghi, Hatef, additional, Grace, Iain, additional, Higgins, Simon J., additional, Anderson, Harry L., additional, Nichols, Richard J., additional, and Lambert, Colin J., additional

Published
2019
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11. Gateway state-mediated, long-range tunnelling in molecular wires

Author

Sangtarash, Sara, primary, Vezzoli, Andrea, additional, Sadeghi, Hatef, additional, Ferri, Nicolò, additional, O'Brien, Harry M., additional, Grace, Iain, additional, Bouffier, Laurent, additional, Higgins, Simon J., additional, Nichols, Richard J., additional, and Lambert, Colin J., additional

Published
2018
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13. The single-molecule electrical conductance of a rotaxane-hexayne supramolecular assembly

Author

Milan, David C., primary, Krempe, Maximilian, additional, Ismael, Ali K., additional, Movsisyan, Levon D., additional, Franz, Michael, additional, Grace, Iain, additional, Brooke, Richard J., additional, Schwarzacher, Walther, additional, Higgins, Simon J., additional, Anderson, Harry L., additional, Lambert, Colin J., additional, Tykwinski, Rik R., additional, and Nichols, Richard J., additional

Published
2017
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14. Insulated molecular wires: inhibiting orthogonal contacts in metal complex based molecular junctions

Author

Al-Owaedi, Oday A., primary, Bock, Sören, additional, Milan, David C., additional, Oerthel, Marie-Christine, additional, Inkpen, Michael S., additional, Yufit, Dmitry S., additional, Sobolev, Alexandre N., additional, Long, Nicholas J., additional, Albrecht, Tim, additional, Higgins, Simon J., additional, Bryce, Martin R., additional, Nichols, Richard J., additional, Lambert, Colin J., additional, and Low, Paul J., additional

Published
2017
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20. Graphene-porphyrin single-molecule transistors

Author

Mol, Jan A., primary, Lau, Chit Siong, additional, Lewis, Wilfred J. M., additional, Sadeghi, Hatef, additional, Roche, Cecile, additional, Cnossen, Arjen, additional, Warner, Jamie H., additional, Lambert, Colin J., additional, Anderson, Harry L., additional, and Briggs, G. Andrew D., additional

Published
2015
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24. Single molecule vs. large area design of molecular electronic devices incorporating an efficient 2-aminepyridine double anchoring group

Author

Colin J. Lambert, José Luis Serrano, Richard J. Nichols, David C. Milan, Santiago Martín, I. Lucía Herrer, Ali K. Ismael, Pilar Cea, Ministerio de Economía y Competitividad (España), Agencia Estatal de Investigación (España), Ministerio de Ciencia, Innovación y Universidades (España), European Commission, Diputación General de Aragón, Engineering and Physical Sciences Research Council (UK), University of Tikrit, Ministry of Higher Education and Scientific Research (Iraq), Martín, Santiago [0000-0001-9193-3874], Serrano, José Luis [0000-0001-9866-6633], Nichols, Richard J. [0000-0002-1446-8275], Lambert, Colin J. [0000-0003-2332-9610], Cea, Pilar [0000-0002-4729-9578], Martín, Santiago, Serrano, José Luis, Nichols, Richard J., Lambert, Colin J., and Cea, Pilar

Subjects
Materials science, Conductance, Anchoring, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, Ring (chemistry), 01 natural sciences, 0104 chemical sciences, Crystallography, Electrical resistance and conductance, Electrode, Monolayer, Molecule, General Materials Science, 0210 nano-technology, Order of magnitude
Abstract

When a molecule is bound to external electrodes by terminal anchor groups, the latter are of paramount importance in determining the electrical conductance of the resulting molecular junction. Here we explore the electrical properties of a molecule with bidentate anchor groups, namely 4,4′-(1,4-phenylenebis(ethyne-2,1-diyl))bis(pyridin-2-amine), in both large area devices and at the single molecule level. We find an electrical conductance of 0.6 × 10−4G0 and 1.2 × 10−4G0 for the monolayer and for the single molecule, respectively. These values are approximately one order of magnitude higher than those reported for monodentate materials having the same molecular skeleton. A combination of theory and experiments is employed to understand the conductance of monolayer and single molecule electrical junctions featuring this new multidentate anchor group. Our results demonstrate that the molecule has a tilt angle of 30° with respect to the normal to the surface in the monolayer, while the break-off length in the single molecule junction occurs for molecules having a tilt angle estimated as 40°, which would account for the difference in their conductance values per molecule. The bidentate 2-aminepyridine anchor is of general interest as a contact group, since this terminal functionalized aromatic ring favours binding of the adsorbate to the metal contact resulting in enhanced conductance values., P. C. and J. L. S. are grateful for financial assistance from Ministerio de Economía y Competitividad from Spain and fondos FEDER in the framework of projects MAT2016-78257-R, CTQ2015-70174-P and PGC2018-097583-B-I00. J. L. S. also acknowledges the funded project Hierarchical Self Assembly of Polymeric Soft Systems, “SASSYPOL”, from the 7th Framework Programme (CEE, Ref-607602). L. H., S. M., J. L. S, and P. C. acknowledge support from DGA/Fondos FEDER (construyendo Europa desde Aragón) for funding PLATON (E31_17R) and CLIP (E47_17R) research groups. R. J. N. thanks EPSRC for funding (EP/M029522/1, EP/M005046/1 and EP/K007785/1). A. K. I. and C. J. L. acknowledge financial support from the UK EPSRC, through grant no. EP/M014452/1, EP/P027156/1 and EP/N03337X/1. This work was additionally supported by the European Commission is provided by the FET Open project 767187 – QuIET and the EU project Bac-to-Fuel. A. K. I. is grateful for financial assistance from Tikrit University (Iraq), and the Iraqi Ministry of Higher Education (SL-20).

Published
2019

25. MoS 2 nano flakes with self-adaptive contacts for efficient thermoelectric energy harvesting.

Author

Wu Q, Sadeghi H, and Lambert CJ

Abstract

We examine the potential of the low-dimensional material MoS2 for the efficient conversion of waste heat to electricity via the Seebeck effect. Recently monolayer MoS2 nano flakes with self-adaptive Mo6S6 contacts were formed, which take advantage of mechanical stability and chemical covalent bonding to the MoS2. Here, we study the thermoelectric properties of these junctions by calculating their conductance, thermopower and thermal conductance due to both electrons and phonons. We show that thermoelectric figures of merit ZT as high as ∼2.8 are accessible in these junctions, independent of the flake size and shape, provided the Fermi energy is close to a band edge. We show that Nb dopants as substituents for Mo atoms can be used to tune the Fermi energy, and despite the associated inhomogeneous broadening, room temperature values as high as ZT ∼ 0.6 are accessible, increasing to 0.8 at 500 K.

Published
2018
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