亚纳米级硒化铟纳米带,ACS Nano

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亚纳米级硒化铟纳米带
ACS Nano ( IF 15.8 ) Pub Date : 2023-03-14 , DOI: 10.1021/acsnano.3c00670
William J Cull ₁ , Stephen T Skowron ₁ , Ruth Hayter ₁ , Craig T Stoppiello ₂ , Graham A Rance ₂ , Johannes Biskupek ₃ , Zakhar R Kudrynskyi _{4,

5} , Zakhar D Kovalyuk ₆ , Christopher S Allen ₇ , Thomas J A Slater ₇ , Ute Kaiser ₃ , Amalia Patanè ₄ , Andrei N Khlobystov _{1,

2}

Affiliation

硒化铟 (In _x Se _y ) 已被证明保留了几个理想的特性，例如铁电性、通过温度控制相变的可调谐光致发光，以及当限制在二维 (2D) 时的高电子迁移率。在这项工作中，我们通过在单壁碳纳米管 (SWCNT) 内进行模板化生长，合成了单层、超薄、亚纳米宽的 In _x Se _{y 。}_{尽管 In x} Se _y的复杂多态性，我们表明封装材料的相可以通过比较实验像差校正透射电子显微镜 (AC-TEM) 图像和 In x Se 已知结构的 AC-TEM 模拟_来识别_是的。我们表明，通过改变合成条件，可以制备亚纳米 In_x Se_y的两种不同化学计量之一，即 InSe 或 β-In₂ Se_{3 。}此外，原位AC-TEM 加热实验表明，封装的 β-In₂ Se₃会发生相变，变成 γ-In₂ Se₃高于 400 °C。使用 X 射线光电子能谱 (XPS)、热重分析 (TGA)、能量色散 X 射线分析 (EDX) 和拉曼光谱对封装物质进行进一步分析，证实封装物质的身份。这些材料可以为超薄、亚纳米宽的相变纳米带提供平台，并将其用作纳米电子元件。

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Subnanometer-Wide Indium Selenide Nanoribbons

Indium selenides (In_xSe_y) have been shown to retain several desirable properties, such as ferroelectricity, tunable photoluminescence through temperature-controlled phase changes, and high electron mobility when confined to two dimensions (2D). In this work we synthesize single-layer, ultrathin, subnanometer-wide In_xSe_y by templated growth inside single-walled carbon nanotubes (SWCNTs). Despite the complex polymorphism of In_xSe_y we show that the phase of the encapsulated material can be identified through comparison of experimental aberration-corrected transmission electron microscopy (AC-TEM) images and AC-TEM simulations of known structures of In_xSe_y. We show that, by altering synthesis conditions, one of two different stoichiometries of sub-nm In_xSe_y, namely InSe or β-In₂Se₃, can be prepared. Additionally, in situ AC-TEM heating experiments reveal that encapsulated β-In₂Se₃ undergoes a phase change to γ-In₂Se₃ above 400 °C. Further analysis of the encapsulated species is performed using X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), energy dispersive X-ray analysis (EDX), and Raman spectroscopy, corroborating the identities of the encapsulated species. These materials could provide a platform for ultrathin, subnanometer-wide phase-change nanoribbons with applications as nanoelectronic components.

更新日期：2023-03-14

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