Zwitterion-assisted transition metal dichalcogenide nanosheets for scalable and biocompatible inkjet printing
- PDF / 2,694,903 Bytes
- 9 Pages / 612 x 808 pts Page_size
- 69 Downloads / 209 Views
Zwitterion-assisted transition metal dichalcogenide nanosheets for scalable and biocompatible inkjet printing Hyeokjung Lee1, Min Koo1, Chanho Park1, Madhumita Patel2, Hyowon Han1, Tae Hyun Park1, Pawan Kumar1, Won-Gun Koh2, and Cheolmin Park1 () 1 2
Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea Department of Chemical and Biomolecular Engineering, Yonsei University, Seoul 03722, Republic of Korea
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Received: 19 February 2020 / Revised: 3 June 2020 / Accepted: 5 June 2020
ABSTRACT 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 successfully 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 103.8 and photocurrent switching of 500 ms.
KEYWORDS transition metal dichalcogenide nanosheets, zwitterions, zwitterion-assisted liquid-phase exfoliation, scalable inkjet printing, biocompatible
1
Introduction
Atomically thin two-dimensional (2D) transition metal dichalcogenides (TMDs) (e.g. MoS2, MoSe2, WS2, and WSe2) have attracted considerable attention due to their extraordinary properties associated with confined 2D chemical structures, allowing a variety of emerging applications in photo-electronics and energy conversion and storage [1–8]. In addition, considering their mechanically flexible nature, the arrays of devices involving 2D-TMDs, in particular, printed on either plastic or paper have shown great promise for use in wearable and patchable electronics, including epidermal devices [9, 10]. Recent advances in developing printable 2D-material inks from stacked bulk samples by liquid-phase exfoliation (LPE) allow simple, versatile, mass-producible, and low-cost techniques, such as inkjet printing, whi
Data Loading...
