[1P01-32] Poster session

[1P10] STM/STS study of the growth of quaterphenyl-dicarbonitrile self-assembled and metal-adatom-linked molecular films on Cu(111)

*Hikaru Kawaguchi¹, Naoki Hashimoto¹, Haruto Shibahara¹, Masaki Horie², Toyo Kazu Yamada¹ (1. Chiba university (Japan), 2. Hokkaido university (Japan))

This study investigates the growth mechanism and electronic properties of [1,1′:4′,1′′:4′′,1′′′-quaterphenyl]-4,4′′′-dicarbonitrile (Ph₄DN) networks on Cu(111) using ultrahigh-vacuum low-temperature scanning tunneling microscopy and spectroscopy (STM/STS). Cyano-terminated molecules like Ph₄DN are promising building blocks for two-dimensional metal–organic coordination networks, which serve as platforms for ordered quantum spin arrays. To clarify the energetic competition between self-assembled monolayers (SAMs) and Cu-adatom-mediated networks, Ph₄DN adsorption behavior was examined across temperatures from cryogenic to room temperature. Additionally, Co adatoms were introduced into the networks to induce localized quantum spin states. High-resolution STM imaging and spatially resolved dI/dV spectroscopy successfully identified the coordination sites of Co atoms and revealed zero-bias resonance features, providing key insights into the formation and magnetic properties of these functional networks.

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