PT  - JOURNAL ARTICLE
AU  - Hu, Guohua
AU  - Yang, Lisong
AU  - Yang, Zongyin
AU  - Wang, Yubo
AU  - Jin, Xinxin
AU  - Dai, Jie
AU  - Wu, Qing
AU  - Liu, Shouhu
AU  - Zhu, Xiaoxi
AU  - Wang, Xiaoshan
AU  - Wu, Tien-Chun
AU  - Howe, Richard C. T.
AU  - Albrow-Owen, Tom
AU  - Ng, Leonard W. T.
AU  - Yang, Qing
AU  - Occhipinti, Luigi G.
AU  - Woodward, Robert I.
AU  - Kelleher, Edmund J. R.
AU  - Sun, Zhipei
AU  - Huang, Xiao
AU  - Zhang, Meng
AU  - Bain, Colin D.
AU  - Hasan, Tawfique
TI  - A general ink formulation of 2D crystals for wafer-scale inkjet printing
AID  - 10.1126/sciadv.aba5029
DP  - 2020 Aug 01
TA  - Science Advances
PG  - eaba5029
VI  - 6
IP  - 33
4099  - http://advances.sciencemag.org/content/6/33/eaba5029.short
4100  - http://advances.sciencemag.org/content/6/33/eaba5029.full
SO  - Sci Adv2020 Aug 01; 6
AB  - Recent advances in inkjet printing of two-dimensional (2D) crystals show great promise for next-generation printed electronics development. Printing nonuniformity, however, results in poor reproducibility in device performance and remains a major impediment to their large-scale manufacturing. At the heart of this challenge lies the coffee-ring effect (CRE), ring-shaped nonuniform deposits formed during postdeposition drying. We present an experimental study of the drying mechanism of a binary solvent ink formulation. We show that Marangoni-enhanced spreading in this formulation inhibits contact line pinning and deforms the droplet shape to naturally suppress the capillary flows that give rise to the CRE. This general formulation supports uniform deposition of 2D crystals and their derivatives, enabling scalable and even wafer-scale device fabrication, moving them closer to industrial-level additive manufacturing.