Controlled Synthesis of Ultrathin PtSe(2) Nanosheets with Thickness-Tunable Electrical and Magnetoelectrical Properties.
Controlled Synthesis of Ultrathin PtSe(2) Nanosheets with Thickness-Tunable Electrical and Magnetoelectrical Properties.
复制标题
具有厚度可调电学和磁电性能的超薄 PtSe2 纳米片的受控合成
DOI：
10.1002/advs.202103507
复制
发表时间：
2022-01
期刊：
影响因子：
--
通讯作者：
Duan X
中科院分区：
文献类型：
--
作者：
Ma H;Qian Q;Qin B;Wan Z;Wu R;Zhao B;Zhang H;Zhang Z;Li J;Zhang Z;Li B;Wang L;Duan X
自二维（2D）材料出现以来，厚度相关的化学和物理性质引起了人们极大的兴趣。尽管有诱人的前景，但厚度控制合成纳米片仍然是一个突出的挑战。在这里，化学气相沉积（CVD）路线被报道可控地合成具有可调厚度的高质量PtSe 2纳米片，并探索其厚度依赖性的电子和磁输运性质。拉曼光谱研究表明，在较厚的纳米片中，所有的Eg，A1 g，A2 u和Eu模都发生了红移.电测量表明，1.7 nm厚的纳米片是一种室温场效应迁移率为66 cm 2 V−1 s−1和开/关比为106的半导体。2.3-3.8 nm厚的纳米片显示出轻微的门控调制，在室温下具有高达324 cm 2 V−1 s−1的高场效应迁移率。当厚度超过3.8 nm时，纳米片表现出金属行为，电导率和击穿电流密度分别高达6.8 × 105 S m-1和6.9 × 107 A cm-2。有趣的是，磁阻（MR）研究揭示了这种本质上非磁性材料系统中存在磁序，如厚度依赖的近藤效应所示，其中金属到绝缘体的转变和负MR都出现在冷却时。总之，这些研究表明，PtSe 2是一个有趣的系统，既可以开发新的功能电子学，也可以进行基本的2D磁性研究。采用化学气相沉积（CVD）方法制备了不同厚度的二维PtSe 2纳米薄片。厚度相关的电和磁电性能表明，PtSe 2是一个有趣的平台，既开发新的功能电子学和进行基本的二维磁性研究。在这种本征非磁性系统中存在磁序将定义一类新的磁性材料，并激发进一步的研究。
Thickness‐dependent chemical and physical properties have gained tremendous interest since the emergence of two‐dimensional (2D) materials. Despite attractive prospects, the thickness‐controlled synthesis of ultrathin nanosheets remains an outstanding challenge. Here, a chemical vapor deposition (CVD) route is reported to controllably synthesize high‐quality PtSe2 nanosheets with tunable thickness and explore their thickness‐dependent electronic and magnetotransport properties. Raman spectroscopic studies demonstrate all Eg , A 1 g , A 2 u , and Eu modes are red shift in thicker nanosheets. Electrical measurements demonstrate the 1.7 nm thick nanosheet is a semiconductor with room temperature field‐effect mobility of 66 cm2 V−1 s−1 and on/off ratio of 106. The 2.3–3.8 nm thick nanosheets show slightly gated modulation with high field‐effect mobility up to 324 cm2 V−1 s−1 at room‐temperature. When the thickness is over 3.8 nm, the nanosheets show metallic behavior with conductivity and breakdown current density up to 6.8 × 105 S m–1 and 6.9 × 107 A cm−2, respectively. Interestingly, magnetoresistance (MR) studies reveal magnetic orders exist in this intrinsically non‐magnetic material system, as manifested by the thickness‐dependent Kondo effect, where both metal to insulator transition and negative MR appear upon cooling. Together, these studies suggest that PtSe2 is an intriguing system for both developing novel functional electronics and conducting fundamental 2D magnetism study. Ultrathin 2D PtSe2 nanosheets with various thickness are synthesized by a CVD method. The thickness dependent electrical and magnetoelectrical properties suggest that PtSe2 is an intriguing platform for both developing novel functional electronics and conducting fundamental 2D magnetism studies. The existence of magnetic order in this intrinsically non‐magnetic system will define a new class of magnetic material and stimulate further study.
登录
查看更多内容
影响因子：
8.6
作者：
Ma, Huifang;Dang, Weiqi;Duan, Xidong
通讯作者：
Duan, Xidong
通过化学气相沉积法生长的高质量单层超导体 NbSe2
影响因子：
16.6
作者：
Wang H;Huang X;Lin J;Cui J;Chen Y;Zhu C;Liu F;Zeng Q;Zhou J;Yu P;Wang X;He H;Tsang SH;Gao W;Suenaga K;Ma F;Yang C;Lu L;Yu T;Teo EHT;Liu G;Liu Z
通讯作者：
Liu Z
PtSe2 类过渡金属二硫属化物中的 II 型狄拉克费米子
影响因子：
3.7
作者：
Huang, Huaqing;Zhou, Shuyun;Duan, Wenhui
通讯作者：
Duan, Wenhui
影响因子：
17.1
作者：
Liu, Bilu;Fathi, Mohammad;Zhou, Chongwu
通讯作者：
Zhou, Chongwu
影响因子：
17.1
作者：
Wang, Xingli;Gong, Yongji;Ajayan, Pulickel M.
通讯作者：
Ajayan, Pulickel M.