Vapor-Phase Indium Intercalation in van der Waals Nanofibers of Atomically Thin W6Te6 Wires
Vapor-Phase Indium Intercalation in van der Waals Nanofibers of Atomically Thin W6Te6 Wires
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原子薄 W6Te6 线的范德华纳米纤维中的气相铟插层
DOI：
10.1021/acsnano.2c10997
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发表时间：
2023
期刊：
影响因子：
17.1
通讯作者：
Miyata Yasumitsu
中科院分区：
文献类型：
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作者：
Natsui Ryusuke;Shimizu Hiroshi;Nakanishi Yusuke;Liu Zheng;Shimamura Akito;Hung Nguyen Tuan;Lin Yung-Chang;Endo Takahiko;Pu Jiang;Kikuchi Iori;Takenobu Taishi;Okada Susumu;Suenaga Kazu;Saito Riichiro;Miyata Yasumitsu
一维（1D）导电材料作为集成纳米电路的潜在构建块引起了极大的兴趣。三元一维过渡金属硫属化物，由具有插入的A原子的M6X6线组成（M = Mo或W; X = S、Se或Te; A =碱金属或稀有金属等），由于它们的一维金属行为、超导性和机械柔性而引起了人们的广泛关注。然而，传统的固态反应通常产生微米级的块状晶体，限制了它们作为纳米级导体的潜在用途。在这里，我们展示了一种通用的方法来制造铟（In）-嵌入W6Te6（In-W6Te6）束与纳米级厚度。我们首先利用化学气相沉积法制备了微米长的货车德瓦尔斯W6Te6线晶体束，并通过气相反应将In嵌入晶体中。原子分辨电子显微镜显示，在原子周围的三个相邻的W6Te6线。第一性原理计算表明，它们的逐线堆叠可以通过生长后的嵌入转变。个别在W6Te6束表现出金属的行为，从理论上预测。结合偏振拉曼光谱和非共振拉曼计算，我们进一步确定了振动模式。
One-dimensional (1D) conducting materials are of great interest as potential building blocks for integrated nanocircuits. Ternary 1D transition-metal chalcogenides, consisting of M6X6wires 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 W6Te6wires 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 W6Te6wires. First-principles calculations suggested that their wire-by-wire stacking can transform through postgrowth intercalation. Individual In–W6Te6bundles exhibited metallic behavior, as theoretically predicted. We further identified the vibrational modes by combining polarized Raman spectroscopy and nonresonant Raman calculations.