Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 81: Oxide and Insulator Surfaces III

O 81.2: Talk

Thursday, April 3, 2014, 16:15–16:30, PHY C 213

Tuning amorphous network structures — •Christin Büchner, Stefanie Stuckenholz, Markus Heyde, and Hans-Joachim Freund — Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany

A bilayer silica film system has been presented, exhibiting amorphous and ordered regions [1]. Noncontact atomic force microscopy (nc-AFM) and scanning tunneling microscopy (STM) with atomic resolution reveal a network of different ring sizes. The structure can be described in terms of ring size occurrence, neighborhoods and pair distance histograms, which are directly derived from atomic coordinates. In the study of the ring size arrangements of the amorphous region, valuable insights can be gained concerning formation principles of vitreous or amorphous structures. On the basis of knowing these structural properties, tuning the network structures is endeavored. Introducing Al as a dopant, combined with subsequent annealing, results in film structures with new characteristics [2]. Ring size distribution and film growth properties in particular are influenced by the element composition. A study of different networks is presented, focusing on the network features studied with SPM.

[1]L. Lichtenstein, C. Büchner, B. Yang, S. Shaikhutdinov, M. Heyde, M. Sierka, R. Włodarczyk, J. Sauer and H.-J. Freund, Angewandte Chemie International Edition 51 (2012) 404

[2]J. A. Boscoboinik, X. Yu, B. Yang, F. D. Fischer, R. Włodarczyk, M. Sierka, S. Shaikhutdinov, J. Sauer and H.-J. Freund, Angewandte Chemie International Edition 51 (2012) 6005