One-dimensional
(1D) transition metal chalcogenides (TMCs) have
recently attracted much attention because of their atomically thin,
wire structures and superior conducting properties. These wires interact
via van der Waals forces, aggregating into 1D crystals of different
shapes with desired properties. However, relevant studies on their
transport properties remain limited because of the lack of high-quality
samples. Herein, we report the formation of a two-dimensional (2D)
carrier gas in thin, ribbon-shaped bundles of laterally assembled
WTe nanowires grown by chemical vapor deposition. Magnetoresistance
measurements reveal that a single WTe bundle exhibits weak antilocalization
and Shubnikov-de Haas (SdH) oscillations at low temperatures. Angle-dependent
SdH oscillations serve as evidence of the realization of a 2D carrier
gas in the WTe bundle. The present findings indicate the versatility
of TMC nanowires as building blocks to produce electronic systems
of desired dimensionality for future functional electronic and energy-harvesting
devices.
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.
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