[Prof. Sunmin Ryu]Redox-governed charge doping dictated by interfacial diffusion in two-dimensional materials
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작성자 최고관리자 댓글 조회 작성일 19-10-29 15:56본문
Redox-governed charge doping dictated by interfacial diffusion in two-dimensional materials
Kwanghee Park#, Haneul Kang#, Seonghyun Koo, DaeEung Lee, and Sunmin Ryu* (#equal contribution)
Controlling extra charge carriers is pivotal in manipulating electronic, optical, and magnetic properties of various two-dimensional materials. Nonetheless, the ubiquitous hole doping of two-dimensional 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 two-dimensional nanoscopic space between two-dimensional 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. https://www.nature.com/articles/s41467-019-12819-w- 이전글[Prof. Seung Hwan Cho]Copper-Catalyzed Diastereoselective and Enantioselective Addition of 1,1-Diborylalkanes to Cyclic Ketimines and α-Imino Esters 19.08.16
- 다음글[Prof. Hee Cheul Choi]Selective growth of α-form zinc phthalocyanine nanowire crystals via the flow rate control of physical vapor transport 20.02.11
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