AVS 63rd International Symposium & Exhibition
    Surface Science Tuesday Sessions
       Session SS-TuP

Paper SS-TuP8
Supramolecular Assemblies of Halogenated Molecules on the Si(111) √3×√3-Ag and Cu(100) Surfaces

Tuesday, November 8, 2016, 6:30 pm, Room Hall D

Session: Surface Science Poster Session
Presenter: Renjie Liu, Lakehead University, Canada
Authors: R. Liu, Lakehead University, Canada
C. Fu, McGill University, Canada
A.G. Moiseev, McGill University, Canada
D.F. Perepichka, McGill University, Canada
M.C. Gallagher, Lakehead University, Canada
Correspondent: Click to Email
The surface-confined assembly of two-dimensional (2-d) covalent organic frameworks (COF) has gained much attention [1]. One approach to COF formation is the adsorption of halogenated aromatic precursors onto a noble metal surfaces, followed by dehalogenation of the precursors, and subsequent covalent coupling. We have studied the adsorption of a halogenated organic molecule, 2,4,6-tris(4-iodophenyl)-1,3,5-triazine (TIPT), on both the Cu(100) and Si(111)-√3×√3-Ag surfaces by scanning tunneling microscopy (STM). Recently, we found that the Si √3–Ag surface can provides an inert, high-mobility template for the adsorption of halogenated organic molecules [2].

STM images reveal that TIPT monomers are quite mobile on the Cu(100) surface at room temperature. At low coverage, molecules readily migrate and accumulate at step edges. We observe very few supramolecular features at the surface, and these structures often decompose after repeated STM scanning. In contrast to the as deposited samples, after annealing to 420°K more robust open pore structures are observed. The structure and size of these molecular frameworks are consistent with covalent linking. We have also studied TIPT adsorption on the √3-Ag surface. The structure of these films as a function of coverage and annealing temperature will be discussed.

1. D.F.Perepichka, and F. Rosei, Science 323, 216–217 (2009).

2. R. Liu et al., Surf. Sci. 647, 51–54 (2016).