Anomalous in-plane electrical anisotropy in elemental metal nanosheets

0 CHEMISTRY, MULTIDISCIPLINARY
Taehoon Kim, Dongchul Seo, Sungsoon Kim, Gyu Won Kim, Seung-Jae Shin, Se Young Kim, Minwoo Lee, Jihong Bae, Hansol Ra, Minjun Kim, Taeyoung Kim, Soyeon Lee, Seung-Rok Kim, Hyunmin Cho, Han Joo Lee, Jaehyeok Choi, Seongil Im, Jin-Woo Park, Jinwoo Cheon, Joon Sang Lee, Aron Walsh, Wooyoung Shim
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Abstract

Two-dimensional (2D) elemental metals, often overlooked owing to their lack of switching or dielectric properties, have the potential to exhibit unique properties unachievable by their bulk counterparts if their microstructure can be controlled. Here we propose an electrodeposition method that utilizes a confined 2D template to prepare elemental metal nanosheets with an aligned grain orientation, resulting in an exceptionally high in-plane electrical anisotropy of >103. Heterogeneous nucleation is initiated and the directed growth of the metal at the cathode is controlled within a channel whose size is smaller than the critical size of the nuclei. This leads to the formation of anisotropic microstructures, and consequently, the nanosheets exhibit anisotropic electrical properties. Unlike conventional field-effect transistors, devices employing a channel with two orthogonally separated conduction paths yield an exceptional on–off switching ratio exceeding 104. Our approach offers a promising route to produce various 2D elemental metals with properties different from those observed in their bulk counterparts and highlights the potential of anisotropic metallic nanosheets as switching elements. An electrodeposition method is proposed for the growth of elemental metal nanosheets with aligned grain orientation using a confined 2D template. Nucleation and growth are controlled within a confined 2D channel, resulting in nanosheets with high in-plane electrical anisotropy (>103), highlighting their potential as switching elements.

Abstract Image

单质金属纳米片的面内异常电各向异性
二维(2D)元素金属由于缺乏开关或介电特性而经常被忽视,如果可以控制其微观结构,则有可能表现出其块状对应物无法实现的独特特性。在这里,我们提出了一种电沉积方法,利用受限的2D模板来制备具有排列晶粒取向的元素金属纳米片,从而获得极高的面内电各向异性>;103。非均相成核开始,金属在阴极处的定向生长被控制在一个尺寸小于原子核临界尺寸的通道内。这导致了各向异性微结构的形成,因此,纳米片表现出各向异性的电性能。与传统的场效应晶体管不同,采用具有两个正交分离传导路径的通道的器件产生了超过104的特殊开关比。我们的方法提供了一种有希望的途径来生产各种2D元素金属,这些元素金属的性质不同于在它们的块状对应物中观察到的性质,并强调了各向异性金属纳米片作为开关元件的潜力。提出了一种电沉积方法,用于在受限的二维模板上生长具有排列晶粒取向的元素金属纳米片。成核和生长控制在一个受限的二维通道内,导致纳米片具有高平面内电各向异性(>103),突出了它们作为开关元件的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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CiteScore
8.10
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