Abstract

OBREGON RODRIGUEZ, Yris Del Pilar  and  MAYOR SANCHEZ, César R. Study of alkyl-bromide monolayers on hydrogenterminated silicon (100) surfaces. Rev. Soc. Quím. Perú [online]. 2018, vol.84, n.1, pp.133-142. ISSN 1810-634X.

The organic monolayers of saturated alkyl chains linked to silicon substrates are used for the development of devices with important electronic properties. In this study, thanks to the use of 10-bromine-1-decene and 11-bromine-1-undecene molecules on silicon surfaces, the formation of a system potentially applicable in the modification of the end groups of the carbon chain is achieved in the organic monolayers, that is to say the functionalization of the monolayer allowing a better charge transport through the molecules. The silicon surface (oxide-free) was passivated by hydrogenation. Respect to the formation of the organic monolayer, the hydrogen-terminated silicon surface was subjected to 200°C with each of the mentioned organic molecules. Both the hydrogenated surface and the organic monolayers were characterized by the measurement of the contact angle between water droplets and the surface, and atomic force microscopy. Finally, by means of molecular calculations at levels 3-21(G) on clusters of Si₇H₆, Si₇H₁₅C₁₀H₂₀Br and Si₇H₁₅C₁₁H₂₂Br, possible reactions of formation of the organic monolayers previously studied experimentally, are proposed.

Keywords : Alkyl monolayers on Si (100); contact angle; atomic force microscopy (AFM); silicon hydride clusters.

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