@article {Zhou2020-iy,
	title = {All 3D-printed stretchable piezoelectric nanogenerator with non-protruding kirigami structure},
	journal = {Nano Energy},
	volume = {72},
	year = {2020},
	month = {jun},
	pages = {104676},
	publisher = {Elsevier Ltd},
	abstract = {With the advancement of wearable electronics, stretchable energy harvesters are attractive to reduce the need of frequent charging of wearable devices. In this work, a stretchable kirigami piezoelectric nanogenerator (PENG) based on barium titanate (BaTiO3) nanoparticles, Poly(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)) matrix, and silver flakes-based electrode is fabricated in an all-3D printable process suited for additive manufacturing. The 3D printable extrusion ink is formulated for facile solvent evaporation during layer formation to enable heterogenous multilayer stacking. A well-designed modified T-joint-cut kirigami structure is realized to attain a non-protruding, high structural stretchability performance, overcoming the out-of-plane displacement of the typical kirigami structure and therefore enabling the pressing-mode of a kirigami-structured PENG. This PENG can be stretched to more than 300\% strain, which shows a great potential for application in wearable electronic systems. Furthermore, a self-powered gait sensor is demonstrated using this PENG.},
	keywords = {3d printing, Direct-write printing, Gait analysis, Kirigami, Piezoelectric nanogenerator, Stretchable},
	author = {Zhou, Xinran and Parida, Kaushik and Halevi, Oded and Liu, Yizhi and Xiong, Jiaqing and Magdassi, Shlomo and Lee, Pooi See}
}
