Macro- and atomic-scale observations of a one-dimensional heterojunction in a nickel and palladium nanowire complex

Masanori Wakizaka (), Shohei Kumagai, Hashen Wu, Takuya Sonobe, Hiroaki Iguchi, Takefumi Yoshida, Masahiro Yamashita () and Shinya Takaishi ()
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Masanori Wakizaka: Tohoku University
Shohei Kumagai: Tohoku University
Hashen Wu: Tohoku University
Takuya Sonobe: Tohoku University
Hiroaki Iguchi: Tohoku University
Takefumi Yoshida: Tohoku University
Masahiro Yamashita: Tohoku University
Shinya Takaishi: Tohoku University

Nature Communications, 2022, vol. 13, issue 1, 1-5

Abstract: Abstract The creation of low-dimensional heterostructures for intelligent devices is a challenging research topic; however, macro- and atomic-scale connections in one-dimensional (1D) electronic systems have not been achieved yet. Herein, we synthesize a heterostructure comprising a 1D Mott insulator [Ni(chxn)2Br]Br2 (1; chxn = 1R-2R-diaminocyclohexane) and a 1D Peierls or charge-density-wave insulator [Pd(chxn)2Br]Br2 (2) using stepwise electrochemical growth. It can be considered as the first example of electrochemical liquid-phase epitaxy applied to molecular-based heterostructures with a macroscopic scale. Moreover, atomic-resolution scanning tunneling microscopy images reveal a modulation of the electronic state in the heterojunction region with a length of five metal atoms (~ 2.5 nm), that is a direct evidence for the atomic-scale connection of 1 and 2. This is the first time that the heterojunction in the 1D chains has been shown and examined experimentally at macro- and atomic-scale. This study thus serves as proof of concept for heterojunctions in 1D electronic systems.

Date: 2022
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DOI: 10.1038/s41467-022-28875-8

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