Pt atoms adsorbed on TiO2(110)-(1 × 1) studied with noncontact atomic force microscopy and first-principles simulations
Entity
UAM. Departamento de Física Teórica de la Materia CondensadaPublisher
American Physical SocietyDate
2015-01Citation
10.1103/PhysRevB.91.075401
Physical review B: Condensed matter and materials physics 91.7 (2015): 075401
ISSN
1098-0121 (print); 1550-235X (online)DOI
10.1103/PhysRevB.91.075401Funded by
This work was supported by Grants-in-Aid for Scientific Research (No. 22221006, No. 25106002, No. 24360016, No. 26600099, No. 2600015, No. 26110516, and No. 20760024) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan, Funding Program for Next Generation World-Leading Researchers and by the Ministerio de Economia y Competitividad (MINECO, Spain) uder Projects No. MAT2011-23627, No. CSD2010-00024, and No. PLE2009-0061Project
Gobierno de España. MAT2011-23627; Gobierno de España. CSD2010-00024; Gobierno de España. PLE2009-0061Editor's Version
http://dx.doi.org/10.1103/PhysRevB.91.075401Subjects
Pt atoms; Protrusions; TiO2(110) surface; Nanoclusters; Electropositive; FísicaRights
©2015 American Physical SocietyAbstract
We have studied the local properties of single Pt atoms adsorbed on hydroxylated TiO2(110)-(1 × 1) by combining noncontact atomic force microscopy (nc-AFM) and first-principles calculations. Room-temperature high-resolution nc-AFM images for the most frequently observed contrast modes reveal bright and elongated protrusions that can be traced back to the Pt atoms, and that are centered on the fivefold coordinated titanium rows, confined between two bridging oxygen rows. These observations are in line with the theoretical results, as the lowest energy sites for the Pt atom on the TiO2(110) surface are in the neighborhood of the titanium rows, and high energy barriers have to be overcome to displace the Pt atom over the bridging oxygen rows. Single Pt atoms can be distinguished from H adsorbates (OH defects) due to their characteristic shape and binding site and, because they appear as the brightest surface features in all of the contrast modes. Force spectroscopy data over the protrusion and hole imaging modes and the corresponding tip-sample forces, simulated with O and OH terminated TiO2 nanoclusters, provide an explanation for this puzzling result in terms of the intrinsic strength of the interaction with the Pt adatom and the adatom and tip apex relaxations induced by the tip-sample interaction. These imaging mechanisms can be extended to other electropositive metal dopants and support the use of nc-AFM not only to characterize their adsorption structure but also to directly probe their chemical reactivity
Files in this item
Google Scholar:Fernández-Torre, Delia
-
Yurtsever, Ayhan
-
Onoda, Jo
-
Abe, Masayuki
-
Morita, Seizo
-
Sugimoto, Yoshiaki
-
Pérez Pérez, Rubén
This item appears in the following Collection(s)
Related items
Showing items related by title, author, creator and subject.
-
Assignment of the Raman Spectrum of Benzylic Amide [2]Catenane: Raman Microscopy Experiments and First-Principles Calculations
Romero-Muñiz, Carlos; Paredes-Roibás, Denís; López, Concepción; Hernanz, Antonio; Gavira-Vallejo, José María
2018-07-17 -
First-principles study of the atomic properties and adhesion at metal-ceramic interfaces
Beltrán Fínez, Juan Ignacio
2007