Solvent Effect on the Formation of Octaneselenocyanate Self-Assembled Monolayers on Au(111)

Seulki Han; Heegun Park; Jin Wook Han; Kaisei Yoshizawa; Tomohiro Hayashi; Masahiko Hara; Jaegeun Noh

doi:10.1166/jnn.2019.16706

Solvent Effect on the Formation of Octaneselenocyanate Self-Assembled Monolayers on Au(111)

J Nanosci Nanotechnol. 2019 Aug 1;19(8):4795-4798. doi: 10.1166/jnn.2019.16706.

Authors

Seulki Han¹, Heegun Park¹, Jin Wook Han¹, Kaisei Yoshizawa², Tomohiro Hayashi², Masahiko Hara¹, Jaegeun Noh³

Affiliations

¹ Department of Chemistry, Hanyang University, Seongdong-gu, Seoul 04763, Korea.
² Department of Materials Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta, Midoriku, Yokohama 226-8502, Japan.
³ Institute of Nano Science and Technology, Hanyang University, Seongdong-gu, Seoul 04763, Korea.

PMID: 30913790
DOI: 10.1166/jnn.2019.16706

Abstract

Solvent effect on the formation and electrochemical behavior of octaneselenolate (C8Se) self-assembled monolayers (SAMs) on Au(111) derived from the adsorption of octaneselenocyanate (C8Se-CN) molecules in various solvents at 363 K for 1 h was examined by scanning tunneling microscopy (STM) and cyclic voltammetry (CV). STM imaging clearly revealed that the formation and structure of C8Se SAMs were markedly influenced by the polarity of solvent. C8Se SAMs formed in octane were composed of liquid-like disordered phase. In contrast, C8Se SAMs formed in DMF had ordered domains but not a uniform surface, whereas C8Se SAMs formed in ethanol had uniform surface and highly ordered domains with a (2 × 2 √13) structure. It was found that the structural quality of C8Se SAMs increased with increasing solvent polarity in the order of ethanol > DMF > octane. CV measurements also showed that blocking efficiency of C8Se SAMs for electrode reaction increased with increasing the structural quality of SAMs.