Two-Dimensional Atomic-Layered Alloy Junctions for High-Performance Wearable Chemical Sensor

详细信息    查看全文

• 作者：Byungjin Cho ; Ah Ra Kim ; Dong Jae Kim ; Hee-Suk Chung ; Sun Young Choi ; Jung-Dae Kwon ; Sang Won Park ; Yonghun Kim ; Byoung Hun Lee ; Kyu Hwan Lee ; Dong-Ho Kim ; Jaewook Nam ; Myung Gwan Hahm
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：August 3, 2016
• 年：2016
• 卷：8
• 期：30
• 页码：19635-19642
• 全文大小：507K
• 年卷期：0
• ISSN：1944-8252

文摘

We first report that two-dimensional (2D) metal (NbSe₂)–semiconductor (WSe₂)-based flexible, wearable, and launderable gas sensors can be prepared through simple one-step chemical vapor deposition of prepatterned WO₃ and Nb₂O₅. Compared to a control device with a Au/WSe₂ junction, gas-sensing performance of the 2D NbSe₂/WSe₂ device was significantly enhanced, which might have resulted from the formation of a Nb_xW_1–xSe₂ transition alloy junction lowering the Schottky barrier height. This would make it easier to collect charges of channels induced by molecule adsorption, improving gas response characteristics toward chemical species including NO₂ and NH₃. 2D NbSe₂/WSe₂ devices on a flexible substrate provide gas-sensing properties with excellent durability under harsh bending. Furthermore, the device stitched on a T-shirt still performed well even after conventional cleaning with a laundry machine, enabling wearable and launderable chemical sensors. These results could pave a road toward futuristic gas-sensing platforms based on only 2D materials.