title: Two-Dimensional Atomic-Layered Alloy Junctions for High-Performance Wearable Chemical Sensor.
abstract: 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 NbxW1-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.
authors.forename: Byungjin
authors.initials: B
authors.lastname: Cho
authors.forename: Ah Ra
authors.initials: AR
authors.lastname: Kim
authors.affiliation: School of Chemical Engineering, Sungkyunkwan University , 300 Cheongcheon-dong, Suwon, Gyeonggi-do 16419, Republic of Korea.
authors.forename: Dong Jae
authors.initials: DJ
authors.lastname: Kim
authors.affiliation: Jeonju Center, Korea Basic Science Institute , Jeonju, Jeollabuk-do 54907, Republic of Korea.
authors.forename: Hee-Suk
authors.initials: HS
authors.lastname: Chung
authors.forename: Sun Young
authors.initials: SY
authors.lastname: Choi
authors.forename: Jung-Dae
authors.initials: JD
authors.lastname: Kwon
authors.forename: Sang Won
authors.initials: SW
authors.lastname: Park
authors.affiliation: School of Materials Science and Engineering, Gwanju Institute of Science and Technology , 261 Cheomdan-gwangiro, Buk-Gu, Gwangju 61005, Republic of Korea.
authors.forename: Yonghun
authors.initials: Y
authors.lastname: Kim
authors.affiliation: School of Materials Science and Engineering, Gwanju Institute of Science and Technology , 261 Cheomdan-gwangiro, Buk-Gu, Gwangju 61005, Republic of Korea.
authors.forename: Byoung Hun
authors.initials: BH
authors.lastname: Lee
authors.forename: Kyu Hwan
authors.initials: KH
authors.lastname: Lee
authors.forename: Dong-Ho
authors.initials: DH
authors.lastname: Kim
authors.affiliation: School of Chemical Engineering, Sungkyunkwan University , 300 Cheongcheon-dong, Suwon, Gyeonggi-do 16419, Republic of Korea.
authors.forename: Jaewook
authors.initials: J
authors.lastname: Nam
authors.affiliation: Department of Materials Science and Engineering, Inha University , 100 Inharo, Namgu, Incheon 22212, Republic of Korea.
authors.forename: Myung Gwan
authors.initials: MG
authors.lastname: Hahm
keywords: 2D layer junctions; NbSe2; WSe2; one-step CVD synthesis; wearable chemical sensors