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In article number 1804583, Zheng Lou, Guozhen Shen, and co‐workers develop a highly sensitive printed sensing platform based on polycrystalline microwires with grain boundaries. The polycrystalline structure leads to the printed gas sensor exhibiting a high sensitivity of 831%, which is 6.5 times better than single‐crystalline microwire sensors tested in comparison.
The development of materials with high efficiency and stable signal output in a bent state is important for flexible electronics. Grain boundaries provide lasting inspiration and a promising avenue for designing advanced functionalities using nanomaterials. Combining bulk defects in polycrystalline materials is shown to result in rich new electronic structures, catalytic activities, and mechanical...
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