Gas Sensors: Grain‐Boundary‐Induced Drastic Sensing Performance Enhancement of Polycrystalline‐Microwire Printed Gas Sensors (Adv. Mater. 4/2019)

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.