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RISS 인기검색어
- 검색키워드
- 저자 : Therien, Michael J. (검색결과 3 건)
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Li, Zhihai,Smeu, Manuel,Park, Tae-Hong,Rawson, Jeff,Xing, Yangjun,Therien, Michael J.,Ratner, Mark A.,Borguet, Eric American Chemical Society 2014 NANO LETTERS Vol.14 No.10
<P>Single molecule break junction experiments and nonequilibrium Green’s function calculations using density functional theory (NEGF-DFT) of carbodithioate- and thiol-terminated [5,15-bis(phenylethynyl)-10,20-diarylporphinato]zinc(II) complexes reveal the impact of the electrode-linker coordination mode on charge transport at the single-molecule level. Replacement of thiolate (−S<SUP>–</SUP>) by the carbodithioate (−CS<SUB>2</SUB><SUP>–</SUP>) anchoring motif leads to an order of magnitude increase of single molecule conductance. In contrast to thiolate-terminated structures, metal–molecule–metal junctions that exploit the carbodithioate linker manifest three distinct conductance values. We hypothesize that the magnitudes of these conductances depend upon carbodithoate linker hapticity with measured conductances across Au-[5,15-bis(4′-(dithiocarboxylate)phenylethynyl)-10,20-diarylporphinato]zinc(II)-Au junctions the greatest when both anchoring groups attach to the metal surface in a bidentate fashion. We support this hypothesis with NEGF-DFT calculations, which consider the electron transport properties for specific binding geometries. These results provide new insights into the origin of molecule-to-molecule conductance heterogeneity in molecular charge transport measurements and the factors that optimize electrode–molecule–electrode electronic coupling and maximize the conductance for charge transport.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2014/nalefd.2014.14.issue-10/nl502466a/production/images/medium/nl-2014-02466a_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl502466a'>ACS Electronic Supporting Info</A></P>
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Electronic Transport in Porphyrin Supermolecule-Gold Nanoparticle Assemblies
Conklin, David,Nanayakkara, Sanjini,Park, Tae-Hong,Lagadec, Marie F.,Stecher, Joshua T.,Therien, Michael J.,Bonnell, Dawn A. American Chemical Society 2012 Nano letters Vol.12 No.5
<P>Temperature-dependent transport of hybrid structures consisting of gold nanoparticle arrays functionalized by conjugated organic molecules [(4′-thiophenyl)ethynyl-terminated <I>meso</I>-to-<I>meso</I> ethyne-bridged (porphinato)zinc(II) complexes] that possess exceptional optical and electronic properties was characterized. Differential conductance analysis distinguished the functional forms of the temperature and voltage dependences for a range of sample particles and molecular attachments. Thermally assisted tunneling describes transport for all cases and the associated mechanistic parameters can be used to determine the relative roles of activation energy, work function, and so forth. These results provide the basis on which to examine plasmon-influenced conduction in hybrid systems.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2012/nalefd.2012.12.issue-5/nl300400a/production/images/medium/nl-2012-00400a_0004.gif'></P>
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Exploiting Plasmon-Induced Hot Electrons in Molecular Electronic Devices
Conklin, David,Nanayakkara, Sanjini,Park, Tae-Hong,Lagadec, Marie F.,Stecher, Joshua T.,Chen, Xi,Therien, Michael J.,Bonnell, Dawn A. American Chemical Society 2013 ACS NANO Vol.7 No.5
<P>Plasmonic nanostructures can induce a number of interesting responses in devices. Here we show that hot electrons can be extracted from plasmonic particles and directed into a molecular electronic device, which represents a new mechanism of transfer from light to electronic transport. To isolate this phenomenon from alternative and sometimes simultaneous mechanisms of plasmon–exciton interactions, we designed a family of hybrid nanostructure devices consisting of Au nanoparticles and optoelectronically functional porphyin molecules that enable precise control of electronic and optical properties. Temperature- and wavelength-dependent transport measurements are analyzed in the context of optical absorption spectra of the molecules, the Au particle arrays, and the devices. Enhanced photocurrent associated with exciton generation in the molecule is distinguished from enhancements due to plasmon interactions. Mechanisms of plasmon-induced current are examined, and it is found that hot electron generation can be distinguished from other possibilities.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2013/ancac3.2013.7.issue-5/nn401071d/production/images/medium/nn-2013-01071d_0001.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn401071d'>ACS Electronic Supporting Info</A></P>
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