Zwitterion-assisted transition metal dichalcogenide nanosheets for scalable and biocompatible inkjet printing  

作　　者：Hyeokjung Lee Min Koo Chanho Park Madhumita Patel Hyowon Han Tae Hyun Park Pawan Kumar Won-Gun Koh Cheolmin Park 

机构地区：[1]Department of Materials Science and Engineering Yonsei University,Seoul 03722,Republic of Korea [2]Department of Chemical and Biomolecular Engineering,Yonsei University,Seoul 03722,Republic of Korea

出　　处：《Nano Research》2020年第10期2726-2734,共9页纳米研究（英文版）

基　　金：This research was supported by the Creative Materials Discovery Program through the National Research Foundation of Korea(NRF),funded by the Ministry of Science and ICT(2018M3D1A1058536);This research was also supported by a grant from the NRF funded by the Korean government(MEST)(Nus.2017R1 A2A1A05001160 aurd 2016M3A7B4910530);Tlis work is based upon work supported by the Ministry of Trade,Industry&Energy(MOTTE,Korea)under Industrial Technology Innovation Program(No.10063274).

摘　　要：Inkjet printing of two-dimensional(2D)transition metal dichalcogenide(TMD)nanosheets fabricated by liquid-phase exfoliation(LPE)allows simple,mass-producible,and low-cost photo-electronic devices.Many LPE processes involve toxic and environmentally hazardous solvents;however,dispersants have restricted the extent of applications of 2D-TMD inks.Herein,various 2D-TMD nanosheets,including MoS2,MoSe2,WS2,and WSe2,in addition to few-layered graphene,are inkjet-printed using a LPE process based on zwitterionic dispersants in water.Zwitterions with cationic and anionic species are water-soluble,while alkyl chain moieties associated with two ionic species adhere universally on the surface of TMD nanosheets,resulting in high throughput liquid exfoliation of the nanosheets.The zwitterion-assisted TMD nanosheets in water are successtully employed as an ink without the need for additives to adjust the viscosity and surface tension of the ink for use in an office inkjet printer;this gives rise to A4 scale,large-area inkjet-printed images on diverse substrates,such as metals,oxides,and polymer substrates patchable onto human skin.Combination with conductive graphene nanosheet inks allowed the development of mechanically flexible,biocompatible-printed arrays of photodetectors with pixelated MoSe2 channels on a paper exhibiting a photocurrent ON/OFF ratio of approximately 1038 and photocurrent switching of 500 ms.

关 键 词：transition metal dichalcogenide nanosheets ZWITTERIONS zwitterion-assisted liquid-phase exfoliation scalable inkjet printing BIOCOMPATIBLE 

分 类 号：TB383[一般工业技术—材料科学与工程]