STM observation of a ruthenium dye adsorbed on a TiO2(110) surface

The Journal of Physical Chemistry. B
Akira SasaharaHiroshi Onishi

Abstract

Individual Ru(4,4'-dicarboxy-2,2'-bipyridine)2(NCS)2 molecules, commonly known as N3, adsorbed on a TiO2 surface were visualized with a scanning tunneling microscope (STM) operated in ultrahigh vacuum. A TiO2(110)-(1 x 1) crystal was taken out from the vacuum vessel and immersed into an acetonitrile solution of N3. A monolayer of pivalate ((CH3)3CCOO-) ions was used to protect the (1 x 1) surface from contamination during the wetting process of the N3 adsorption. The N3 molecules adsorbed on the flat terraces protruded by 0.65 nm from the pivalate monolayer. The image height difference of the admolecules could be understood with the assumption that the N3 molecules anchor to the TiO2 surface via two carboxyl groups. The number density of the N3 molecules on the steps was higher than that on the terraces. The poorly coordinated Ti atoms exposed at the step edges form preferential sites where the carboxyl groups can approach, due to a lower steric obstacle or because the structure of the adsorbed N3 molecules suffers less distortion.

References

May 18, 2000·Accounts of Chemical Research·A Hagfeldt, M Grätzel
Jul 21, 2006·The Journal of Physical Chemistry. B·Petter Persson, Maria J Lundqvist

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Citations

Aug 20, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Justin B SamburBruce A Parkinson
Sep 27, 2008·Chemical Society Reviews·Chi Lun PangGeoff Thornton
Oct 25, 2012·Physical Chemistry Chemical Physics : PCCP·Natalia MartsinovichAlessandro Troisi
Dec 3, 2008·The Journal of Chemical Physics·P PalmgrenM Göthelid
Jul 15, 2015·ACS Applied Materials & Interfaces·Jonathan McCree-GreyPeter J Evans
Jun 8, 2015·The Journal of Chemical Physics·Tracey A OudenhovenMartin T Zanni
Dec 25, 2012·Chemical Communications : Chem Comm·Alexandrina SchrammMarcel Mayor
May 17, 2013·Chemical Reviews·Chi Lun PangGeoff Thornton
Apr 21, 2012·Chemical Society Reviews·Andrew G Thomas, Karen L Syres
Jul 2, 2008·Langmuir : the ACS Journal of Surfaces and Colloids·Masatoshi IkedaHiroshi Onishi

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