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May 2012

Volume 30, Issue 3, Articles (03xxxx)

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J. Vac. Sci. Technol. A 30, 030802 (2012); http://dx.doi.org/10.1116/1.4705402 (28 pages)

Tobias Hanrath
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Binding of styrene on silicon (111)-7 × 7 surfaces as a model molecular electronics system

Conan R. Weiland, Liu Yang, Douglas J. Doren, Carl A. Menning, Dimitri Skliar, Brian G. Willis, Jingguang G. Chen, and Robert L. Opila

J. Vac. Sci. Technol. A 30, 031401 (2012); http://dx.doi.org/10.1116/1.3701712 (6 pages)

Online Publication Date: 16 April 2012

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Styrene on Si(111)-7 × 7 surfaces was investigated as a model molecular electronics system to study the effects of conjugation to the semiconductor surface. Scanning tunneling microscopy imaging, combined with theoretical images show that styrene molecules bind in a [4 + 2] cycloaddition mode, binding at the terminal C of the vinyl substituent and a C on the phenyl ring. These single molecule results are consistent with those of ensembles of molecules as obtained by high resolution electron energy loss spectroscopy. For styrene on Si(111)-7 × 7, the aromaticity of the phenyl ring is broken and the conjugated π-system does not extend to the silicon surface, potentially hindering conduction between molecule and surface. However, styrene does retain a conjugated π-system after binding, as is evident in the π-π* shakeup transition in the C 1s x-ray photoelectron spectra as well as UV photoemission spectra. This suggests that styrene-type molecules, when bonded to Si surfaces, do not maintain ready conduction between molecule and surface.
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68.43.-h Chemisorption/physisorption: adsorbates on surfaces
82.30.Nr Association, addition, insertion, cluster formation
68.37.Ef Scanning tunneling microscopy (including chemistry induced with STM)

Solvent-assisted growth of metal phthalocyanine thin films on Au(111)

Levan Tskipuri, Qian Shao, and Janice Reutt-Robey

J. Vac. Sci. Technol. A 30, 031402 (2012); http://dx.doi.org/10.1116/1.4705511 (4 pages) | Cited 1 time

Online Publication Date: 24 April 2012

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Thin films of metal phthalocyanine (MPc) are grown on an Au(111) support with a newly developed aerosol molecular beam deposition source and characterized in situ via ultrahigh vacuum scanning tunneling microscopy. MPcs are delivered to Au(111) in a series of N2-entrained microsized solvent droplets of variable surface residence time. Phthalocyanine film registration to the herringbone reconstruction of the Au(111) surface, indicative of thermodynamically favored structure, is observed at submonolayer coverages for aromatic solvents with long residence times. Aerosol-deposited monolayer film structures are noncrystalline with tilted MPc orientations and vacancy nanocavities. Upon annealing, MPc molecules adopt flat-lying orientations with respect to the substrate and vacancies are eliminated. Film morphologies indicate solvation-mediated film nucleation and growth, with less long-range ordering that in vapor-generated films.
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68.55.A- Nucleation and growth
82.70.Rr Aerosols and foams
81.15.Hi Molecular, atomic, ion, and chemical beam epitaxy
68.37.Ef Scanning tunneling microscopy (including chemistry induced with STM)
61.72.jd Vacancies
61.72.Cc Kinetics of defect formation and annealing
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