A scanning tunneling microscopy investigation of the phases formed by the sulfur adsorption on Au(100) from an alkaline solution of 1,4-piperazine(bis)-dithiocarbamate of potassium
Por:
Martínez J.A., Valenzuela, J, Milan, RC, Herrera J., Farías M.H., Hernández M.P.
Publicada:
30 nov 2014
Categoría:
Surfaces, Coatings and Films
Resumen:
Piperazine-dithiocarbamate of potassium (K 2 DTC 2 pz) was used as a new precursor for the spontaneous deposition of sulfur on the Au(100) surface in alkaline solution. Two new sulfur phases were studied by scanning tunneling microscopy (STM). These phases were formed by six sulfur atoms (S 6 phase, hexamer) and by four sulfur atoms (S 4 phase, tetramer with (v 2 × v2) structure), and they were observed in coexistence with the well-known quasi-square patterns formed by eight sulfur atoms (S 8 phase, octomer). A model was proposed where sulfur multilayers were formed by a (v 2 × v 2) phase adsorbed directly on the gold surface while one of the other structures: hexamers or octomers were deposited on top. Sulfur layers were formed on gold terraces, vacancies and islands produced by lifting reconstructed surface. Sequential high-resolution STM images allowed the direct observation of the dynamic of the octomers, while the (v2×v2) structure remained static. Images also showed the reversible association/dissociation of the octomer. © 2014 Elsevier B.V. All rights reserved.
Filiaciones:
Martínez J.A.:
Instituto de Ciencia y Tecnología de Materiales (IMRE), Universidad de la Habana, Zapata y G, El Vedado, Plaza de la Revolución, La Habana, 10400, Cuba
Valenzuela, J:
Univ Nacl Autonoma Mexico, Ctr Nanociencias & Nanotecnol CNyN, Ensenada 22860, Baja California, Mexico
Herrera J.:
Instituto de Ciencia y Tecnología de Materiales (IMRE), Universidad de la Habana, Zapata y G, El Vedado, Plaza de la Revolución, La Habana, 10400, Cuba
Farías M.H.:
Univ Nacl Autonoma Mexico, Ctr Nanociencias & Nanotecnol CNyN, Ensenada 22860, Baja California, Mexico
Hernández M.P.:
Instituto de Ciencia y Tecnología de Materiales (IMRE), Universidad de la Habana, Zapata y G, El Vedado, Plaza de la Revolución, La Habana, 10400, Cuba
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