| AVS 59th Annual International Symposium and Exhibition | |
| Scanning Probe Microscopy Focus Topic | Wednesday Sessions |
| Session SP+AS+BI+ET+MI+NM+NS+SS+TF-WeM |
| Session: | Probe-Sample Interactions, Nano-Manipulation and Fabrication |
| Presenter: | Y. Zhu, University of California Riverside |
| Authors: | Y. Zhu, University of California Riverside J. Wyrick, University of California Riverside K.D. Cohen, University of California Riverside K. Magnone, University of California Riverside C. Holzke, University of California Riverside D. Salib, University of California Riverside Q. Ma, University of California Riverside D.Z. Sun, University of California Riverside L. Bartels, University of California Riverside |
| Correspondent: | Click to Email |
Abstract: Using variable temperature STM and DFT simulation, we identify the phases of acetylene adsorbed on the Cu(111) surface. Depending on the coverage, a diffraction-derived surface pattern of acetylene on Cu(111) is validated by STM. The modification of the STM image transfer function through the adsorption of an acetylene molecule onto the tip apex is taken into account. In this case, the images of acetylene patterns on Cu(111) also include direct evidence of the rotational orientation and dynamics of the acetylene species attached to the tip apex. DFT modeling of acetylene/Cu(111) reveals that the molecular orientation and separation is governed by a balance of repulsive interactions associated with stress induced in the top surface layer and attractive interactions mediated by the electronic structure of the substrate. Computationally modeling of the substrate with 3 layers obtains the periodicity of the intermolecular interaction that provides a theoretical underpinning for the experimentally observed molecular arrangement.