%0 Journal Article %T Rapid Color‐Switching of MnO2 Hollow‐Nanosphere Films in Dynamic Water Vapor for Reversible Optical Encryption %A Chen, Yibo %A Zuo, Zhi‐Han %A Liu, Zhao‐Qing %A Yin, Yadong %J Small %V 18 %N 49 %@ 1613-6810 %D 2022-12-01 %I Wiley Subscription Services, Inc., A Wiley Company %~ DeepDyve