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Syed, Nitu; Zavabeti, Ali; Ou, Jian Zhen; Mohiuddin, Md; Pillai, Naresh; Carey, Benjamin J; Zhang, Bao Yue; Datta, Robi S; Jannat, Azmira; Haque, Farjana; Messalea, Kibret A; Xu, Chenglong; Russo, Salvy P; McConville, Chris F; Daeneke, Torben; Kalantar-Zadeh, Kourosh
Nature communications, 09/2018, Letnik: 9, Številka: 1Journal Article
Two-dimensional piezotronics will benefit from the emergence of new crystals featuring high piezoelectric coefficients. Gallium phosphate (GaPO ) is an archetypal piezoelectric material, which does not naturally crystallise in a stratified structure and hence cannot be exfoliated using conventional methods. Here, we report a low-temperature liquid metal-based two-dimensional printing and synthesis strategy to achieve this goal. We exfoliate and surface print the interfacial oxide layer of liquid gallium, followed by a vapour phase reaction. The method offers access to large-area, wide bandgap two-dimensional (2D) GaPO nanosheets of unit cell thickness, while featuring lateral dimensions reaching centimetres. The unit cell thick nanosheets present a large effective out-of-plane piezoelectric coefficient of 7.5 ± 0.8 pm V . The developed printing process is also suitable for the synthesis of free standing GaPO nanosheets. The low temperature synthesis method is compatible with a variety of electronic device fabrication procedures, providing a route for the development of future 2D piezoelectric materials.
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