000046568 001__ 46568
000046568 005__ 20170327111925.0
000046568 0247_ $$2doi$$a10.3762/bjnano.6.116
000046568 0248_ $$2sideral$$a90647
000046568 037__ $$aART-2015-90647
000046568 041__ $$aeng
000046568 100__ $$aOsorio, Henrry M.
000046568 245__ $$aElectrical characterization of single molecule and Langmuir–Blodgett monomolecular films of a pyridine-terminated oligo(phenylene-ethynylene) derivative
000046568 260__ $$c2015
000046568 5060_ $$aAccess copy available to the general public$$fUnrestricted
000046568 5203_ $$aMonolayer Langmuir–Blodgett (LB) films of 1,4-bis(pyridin-4-ylethynyl)benzene (1) together with the “STM touch-to-contact” method have been used to study the nature of metal–monolayer–metal junctions in which the pyridyl group provides the contact at both molecule–surface interfaces. Surface pressure vs area per molecule isotherms and Brewster angle microscopy images indicate that 1 forms true monolayers at the air–water interface. LB films of 1 were fabricated by deposition of the Langmuir films onto solid supports resulting in monolayers with surface coverage of 0.98 × 10-9 mol·cm-2. The morphology of the LB films that incorporate compound 1 was studied using atomic force microscopy (AFM). AFM images indicate the formation of homogeneous, monomolecular films at a surface pressure of transference of 16 mN·m-1. The UV–vis spectra of the Langmuir and LB films reveal that 1 forms two dimensional J-aggregates. Scanning tunneling microscopy (STM), in particular the “STM touch-to-contact” method, was used to determine the electrical properties of LB films of 1. From these STM studies symmetrical I–V curves were obtained. A junction conductance of 5.17 × 10-5 G0 results from the analysis of the pseudolinear (ohmic) region of the I–V curves. This value is higher than that of the conductance values of LB films of phenylene-ethynylene derivatives contacted by amines, thiols, carboxylate, trimethylsilylethynyl or acetylide groups. In addition, the single molecule I–V curve of 1 determined using the I(s) method is in good agreement with the I–V curve obtained for the LB film, and both curves fit well with the Simmons model. Together, these results not only indicate that the mechanism of transport through these metal–molecule–metal junctions is non-reso- nant tunneling, but that lateral interactions between molecules within the LB film do not strongly influence the molecule conduc- tance. The results presented here complement earlier studies of single molecule conductance of 1 using STM-BJ methods, and support the growing evidence that the pyridyl group is an efficient and effective anchoring group in sandwiched metal–monolayer–metal junctions prepared under a number of different conditions.
000046568 536__ $$9info:eu-repo/grantAgreement/ES/MINECO/CTQ2012-33198$$9info:eu-repo/grantAgreement/ES/MINECO/CTQ2012-50187-EXP
000046568 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttp://creativecommons.org/licenses/by/3.0/es/
000046568 590__ $$a2.778$$b2015
000046568 591__ $$aMATERIALS SCIENCE, MULTIDISCIPLINARY$$b61 / 270 = 0.226$$c2015$$dQ1$$eT1
000046568 591__ $$aPHYSICS, APPLIED$$b30 / 144 = 0.208$$c2015$$dQ1$$eT1
000046568 591__ $$aNANOSCIENCE & NANOTECHNOLOGY$$b34 / 82 = 0.415$$c2015$$dQ2$$eT2
000046568 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000046568 700__ $$0(orcid)0000-0001-9193-3874$$aMartin, Santiago$$uUniversidad de Zaragoza
000046568 700__ $$0(orcid)0000-0001-6006-4469$$aLopez, María Carmen$$uUniversidad de Zaragoza
000046568 700__ $$aMarqués-González, Santiago
000046568 700__ $$aHiggins, Simon J.
000046568 700__ $$aNichols, Richard J.
000046568 700__ $$aLow, Paul L.
000046568 700__ $$aCea, Pilar
000046568 7102_ $$12012$$2755$$aUniversidad de Zaragoza$$bDepartamento de Química Física$$cQuímica Física
000046568 773__ $$g6 (2015), 1145-1157$$pBeilstein j. nanotechnol.$$tBEILSTEIN JOURNAL OF NANOTECHNOLOGY$$x2190-4286
000046568 8564_ $$s1710559$$uhttp://zaguan.unizar.es/record/46568/files/texto_completo.pdf$$yVersión publicada
000046568 8564_ $$s75906$$uhttp://zaguan.unizar.es/record/46568/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000046568 909CO $$ooai:zaguan.unizar.es:46568$$particulos$$pdriver
000046568 951__ $$a2016-06-27-11:21:36
000046568 980__ $$aARTICLE