2D Freestanding Janus Gold Nanocrystal Superlattices. Issue 37 (10th September 2019) - Shi, Qianqian; Gómez, Daniel E.; Dong, Dashen; Sikdar, Debabrata; Fu, Runfang; Liu, Yiyi; Zhao, Yumeng; Smilgies, Detlef‐M.; Cheng, Wenlong