Liquid-Phase Exfoliation of Magnetically and Optoelectronically Active Ruthenium Trichloride Nanosheets
Liquid-Phase Exfoliation of Magnetically and Optoelectronically Active Ruthenium Trichloride Nanosheets
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DOI：
10.1021/acsnano.2c04888
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发表时间：
2022-06-17
期刊：
影响因子：
17.1
通讯作者：
Hersam, Mark C.
中科院分区：
文献类型：
--
作者：
Lam, David;Lebedev, Dmitry;Hersam, Mark C.
α-RuCl 3是一种层状过渡金属卤化物，其具有一系列奇异的磁性、光学和电子性质，包括指示接近Kitaev量子自旋液体（QSL）的分数激发。虽然以前的报道已经探索了理想化单晶或机械剥离样品的这些性质，但尚未证明α-RuCl 3纳米片的可规模化生产。在这里，我们通过电化学辅助方法进行α RuCl 3的液相剥离（LPE），该方法产生电子掺杂的α-RuCl 3纳米片，然后将其组装成导电的大面积薄膜。通过广泛的结构和化学分析证实了LPE后α-RuCl 3纳米片的结晶完整性。此外，LPE α-RuCl 3纳米片的物理性质的研究，通过电气，光学和磁性表征方法，这揭示了在230 K的结构相变，这是一致的Kitaev顺磁性的开始，除了在2.6 K的反铁磁转变。嵌入离子从电化学LPE协议有利地改变的α-RuCl 3纳米片的光学响应，使大面积的莫特绝缘体光电探测器，工作在近1.55 μ m的红外波长相关的结晶。这些光电探测器显示出作为入射功率的函数的线性光电流响应，这表明可以忽略陷阱介导的复合或光热效应，最终导致接近2 mA/W的光响应度。
alpha-RuCl3 is a layered transition metal halide that possesses a range of exotic magnetic, optical, and electronic properties including fractional excitations indicative of a proximate Kitaev quantum spin liquid (QSL). While previous reports have explored these properties on idealized single crystals or mechanically exfoliated samples, the scalable production of alpha-RuCl3 nanosheets has not yet been demonstrated. Here, we perform liquid-phase exfoliation (LPE) of alpha RuCl3 through an electrochemically assisted approach, which yields ultrathin, electron-doped alpha-RuCl3 nanosheets that are then assembled into electrically conductive large-area thin films. The crystalline integrity of the alpha-RuCl3 nanosheets following LPE is confirmed through a wide range of structural and chemical analyses. Moreover, the physical properties of the LPE alpha-RuCl3 nanosheets are investigated through electrical, optical, and magnetic characterization methods, which reveal a structural phase transition at 230 K that is consistent with the onset of Kitaev paramagnetism in addition to an antiferromagnetic transition at 2.6 K. Intercalated ions from the electrochemical LPE protocol favorably alter the optical response of the alpha-RuCl3 nanosheets, enabling large-area Mott insulator photodetectors that operate at telecommunications-relevant infrared wavelengths near 1.55 mu m. These photodetectors show a linear photocurrent response as a function of incident power, which suggests negligible trap-mediated recombination or photothermal effects, ultimately resulting in a photoresponsivity of approximate to 2 mA/W.