论文标题
由二维材料中的界面扩散决定的氧化还原州的电荷掺杂
Redox-Governed Charge Doping Dictated by Interfacial Diffusion in Two-Dimensional Materials
论文作者
论文摘要
控制额外的电荷载体在操纵各种二维（2D）材料的电子，光学和磁性特性方面至关重要。尽管如此，空气和酸中2D材料的无处不在孔掺杂在其机械细节上一直存在争议。在这里，我们表明它们的共同起源是由氧气和水分子的氧化还原夫妇驱动的电化学反应。利用石墨烯WS2和拉曼光谱的实时光致发光成像，我们通过2D材料和亲水性底物之间的2D纳米镜空间捕获分子扩散，并表明后者可容纳水分子也可以作为水合分析。我们还证明，HCl诱导的掺杂受溶解的O2和pH管辖，根据NERNST方程。在这项工作中解剖的纳米镜电化学为材料特性设定了环境限制，这不仅是2D，而且对其他形式的材料都是普遍的。
Controlling extra charge carriers is pivotal in manipulating electronic, optical, and magnetic properties of various two-dimensional (2D) materials. Nonetheless, the ubiquitous hole doping of 2D materials in the air and acids has been controversial in its mechanistic details. Here we show their common origin is an electrochemical reaction driven by redox couples of oxygen and water molecules. Using real-time photoluminescence imaging of WS2 and Raman spectroscopy of graphene, we capture molecular diffusion through the 2D nanoscopic space between 2D materials and hydrophilic substrates, and show that the latter accommodate water molecules also serving as a hydrating solvent. We also demonstrate that HCl-induced doping is governed by dissolved O2 and pH in accordance with the Nernst equation. The nanoscopic electrochemistry anatomized in this work sets an ambient limit to material properties, which is universal to not only 2D but also other forms of materials.
