Vapor-Phase Indium Intercalation in van der Waals Nanofibers of Atomically Thin W6Te6 Wires
Journal
ACS Nano
Journal Volume
17
Journal Issue
6
Start Page
5561
End Page
5569
ISSN
19360851
1936086X
Date Issued
2023
Author(s)
Natsui, Ryusuke
Shimizu, Hiroshi
Nakanishi, Yusuke
Liu, Zheng
Shimamura, Akito
Lin, Yungchang
Endo, Takahiko
Pu, Jiang
Kikuchi, Iori
Abstract
One-dimensional (1D) conducting materials are of great interest as potential building blocks for integrated nanocircuits. Ternary 1D transition-metal chalcogenides, consisting of M6X6 wires with intercalated A atoms (M = Mo or W; X = S, Se, or Te; A = alkali or rare metals, etc.), have attracted much attention due to their 1D metallic behavior, superconductivity, and mechanical flexibility. However, the conventional solid-state reaction usually produces micrometer-scale bulk crystals, limiting their potential use as nanoscale conductors. Here we demonstrate a versatile method to fabricate indium (In)-intercalated W6Te6 (In-W6Te6) bundles with a nanoscale thickness. We first prepared micrometer-long, crystalline bundles of van der Waals W6Te6 wires using chemical vapor deposition and intercalated In into the crystal via a vapor-phase reaction. Atomic-resolution electron microscopy revealed that In atoms were surrounded by three adjacent W6Te6 wires. First-principles calculations suggested that their wire-by-wire stacking can transform through postgrowth intercalation. Individual In-W6Te6 bundles exhibited metallic behavior, as theoretically predicted. We further identified the vibrational modes by combining polarized Raman spectroscopy and nonresonant Raman calculations.
Subjects
Angle-resolved Polarized Raman Spectroscopy
Intercalation
Nanowire
One-dimensional Van Der Waals Material
Transition Metal Chalcogenide
Atoms
Chalcogenides
Chemical Vapor Deposition
Indium
Indium Compounds
Intercalation
Micrometers
Nanotechnology
Raman Spectroscopy
Solid State Reactions
Transition Metals
Wire
Angle-resolved
Angle-resolved Polarized Raman Spectroscopy
Metallic Behaviors
One-dimensional
One-dimensional Van Der Waal Material
Polarized Raman Spectroscopy
Transition Metal Chalcogenides
Transition-metal Chalcogenides
Van Der Waal
Vapor Phase
Van Der Waals Forces
Publisher
American Chemical Society
Type
journal article