Organic molecules adsorbed on metallic surfaces: nanostructures formation and evaluation of their physic and chemical properties
Keywords:
thioureas, dithiocarbamates, tunneling microscopy, X-ray photoelectron spectroscopy, density functional theoryAbstract
Introduction: Nanostructures were manufactured by adsorbing organic molecules on metal surfaces. The molecules selected for the formation of the nanostructures were: thiourea derivatives 1-(2-furoil)-3-phenylthiourea (T1), 1-(2-furoil)-3-(m-trifuoromethylphenyl)thiourea (T4), 1-(2-furoil)-3-o-toliltiourea (T6) and the sodium salt of piperazine dithiocarbamate [Na2 (DTCPz)].
Objective: To evaluate molecular candidates for manufacturing nanostructures with reproducibility, stability and coupling between electronic and molecular properties, useful in technological applications.
Methods: They were obtained nanostructures by the immersion of the metallic substrate in the solution of the molecules for 24 hours. They were used scanning tunneling microscopy, X-ray photoelectron spectroscopy and density functional theory to describe the structural, physical and chemical properties of the nanostructures.
Results: The formation of sulfur phases, due to the decomposition of Na2 (DTCPz) molecules, during the adsorption process on Au(100) substrates was analyzed by density functional theory and scanning tunneling microscopy. These results explained the coexistence of quasi-rectangular patterns formed by eight (octamers) and six (hexamers) sulfur atoms produced by the expansion and contraction of regions on the Au(100) surface. In particular, for the nanostructures formed by thiourea derivatives the images of scanning tunneling microscopy and the results of X-ray photoelectron spectroscopy confirm the adsorption of T1 and T4 on Au(111) and the decomposition of T6 into the well-known sulfur phases: octamers and hexamers.
Conclusions: A better understanding of the interaction between organosulfur molecules and the gold surface, which in turn favored the development of new potential applications in biosensors, atmospheric sensors, optoelectronic devices, control of heavy ion contamination, energy conversion and medicines.Downloads
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