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Nano Lett. 2018 Oct 10;18(10):6214-6221. doi: 10.1021/acs.nanolett.8b02259. Epub 2018 Sep 28.

One-Dimensional Assembly on Two-Dimensions: AuCN Nanowire Epitaxy on Graphene for Hybrid Phototransistors.

Author information

1
Department of Physics , Ulsan National Institute of Science and Technology (UNIST) , Ulsan 44919 , Korea.
2
Department of Physics , Yonsei University , Seoul 03722 , Korea.
3
Department of Physics , Konkuk University , Seoul 05029 , Korea.
4
Department of Mechanical Engineering , Hanyang University , Ansan 15588 , Korea.
5
School of Chemical and Biological Engineering, Institute of Chemical Process , Seoul National University , Seoul 08826 , Korea.
6
Center for Nanoparticle Research , Institute for Basic Science (IBS) , Seoul 08826 , Korea.
7
UNIST Central Research Facilities (UCRF) , Ulsan National Institute of Science and Technology (UNIST) , Ulsan 44919 , Korea.

Abstract

The van der Waals epitaxy of functional materials provides an interesting and efficient way to manipulate the electrical properties of various hybrid two-dimensional (2D) systems. Here we show the controlled epitaxial assembly of semiconducting one-dimensional (1D) atomic chains, AuCN, on graphene and investigate the electrical properties of 1D/2D van der Waals heterostructures. AuCN nanowire assembly is tuned by different growth conditions, although the epitaxial alignment between AuCN chains and graphene remains unchanged. The switching of the preferred nanowire growth axis indicates that diffusion kinetics affects the nanowire formation process. Semiconducting AuCN chains endow the 1D/2D hybrid system with a strong responsivity to photons with an energy above 2.7 eV, which is consistent with the bandgap of AuCN. A large UV response (responsivity ∼104 A/W) was observed under illumination using 3.1 eV (400 nm) photons. Our study clearly demonstrates that 1D chain-structured semiconductors can play a crucial role as a component in multifunctional van der Waals heterostructures.

KEYWORDS:

1D chain epitaxy; 1D/2D van der Waals heterostructures; AuCN Nanowires; phototransistors

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