论文标题

通过与分子氢的相互作用探测单层MOS $ _2 $的电子特性

Probing the Electronic Properties of Monolayer MoS$_2$ via Interaction with Molecular Hydrogen

论文作者

Rezende, Natália P., Cadore, Alisson R., Gadelha, Andreij C., Pereira, Cíntia L., Ornelas, Vinicius, Watanabe, Kenji, Taniguchi, Takashi, Ferlauto, André S., Malachias, Ângelo, Campos, Leonardo C., Lacerda, Rodrigo G.

论文摘要

这项工作对分子氢(H $ _2 $)与单层MOS $ _2 $ field效应晶体管(MOS $ _2 $ FET)之间的相互作用进行了详细的实验研究,旨在传感应用。 MOS $ _2 $ FET表现出对H $ _2 $的反应,该响应涵盖了相对较低的工作温度范围(300-473 K)的浓度范围(0.1-90%)。最重要的是,基于MOS $ _2 $ FET的H $ _2 $传感器显示出理想的特性,例如完全可逆性和缺乏催化金属掺杂剂(PT或PD)。实验结果表明,由于可逆的电荷传输过程,MOS $ _2 $单调的电导率单调增加,这是H $ _2 $浓度的函数。有人提出,这种过程涉及由与MOS $ _2 $ Surface(VS)中的硫磺空位相互作用驱动的解离h $ _2 $吸附。该描述与有关H $ _2 $吸附在MOS $ _2 $上的相关密度功能理论研究一致。最后,使用沉积氧化铝的原子层进行部分缺陷papsivivivevivivivivivivivivivivivivivivivivivivivivivivivivivivivivivivivivivivivivivivivivivivivivivivivive的MOS $ _2 $ FET的测量值包括一个实验指示,即VS在与MOS $ _2 $的H $ _2 $相互作用中起着重要作用。这些发现为单层MOS $ _2 $和H $ _2 $之间的催化过程中的期货应用提供了见解,并将MOS $ _2 $ FET作为有希望的H $ _2 $传感器。

This work presents a detailed experimental investigation of the interaction between molecular hydrogen (H$_2$) and monolayer MoS$_2$ field effect transistors (MoS$_2$ FET), aiming for sensing application. The MoS$_2$ FET exhibits a response to H$_2$ that covers a broad range of concentration (0.1 - 90%) at a relatively low operating temperature range (300-473 K). Most important, H$_2$ sensors based on MoS$_2$ FETs show desirable properties such as full reversibility and absence of catalytic metal dopants (Pt or Pd). The experimental results indicate that the conductivity of MoS$_2$ monotonically increases as a function of the H$_2$ concentration due to a reversible charge transferring process. It is proposed that such process involves dissociative H$_2$ adsorption driven by interaction with sulfur vacancies in the MoS$_2$ surface (VS). This description is in agreement with related density functional theory studies about H$_2$ adsorption on MoS$_2$. Finally, measurements on partially defect-passivated MoS$_2$ FETs using atomic layer deposited aluminum oxide consist of an experimental indication that the VS plays an important role in the H$_2$ interaction with the MoS$_2$. These findings provide insights for futures applications in catalytic process between monolayer MoS$_2$ and H$_2$ and also introduce MoS$_2$ FETs as promising H$_2$ sensors.

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