Journal article

2D Freestanding Janus Gold Nanocrystal Superlattices

Qianqian Shi, Daniel E Gomez, Dashen Dong, Debabrata Sikdar, Runfang Fu, Yiyi Liu, Yumeng Zhao, Detlef-M Smilgies, Wenlong Cheng

Advanced Materials | WILEY-V C H VERLAG GMBH | Published : 2019

Abstract

2D freestanding nanocrystal superlattices represent a new class of advanced metamaterials in that they can integrate mechanical flexibility with novel optical, electrical, plasmonic, and magnetic properties into one multifunctional system. The freestanding 2D superlattices reported to date are typically constructed from symmetrical constituent building blocks, which have identical structural and functional properties on both sides. Here, a general ligand symmetry-breaking strategy is reported to grow 2D Janus gold nanocrystal superlattice sheets with nanocube morphology on one side yet with nanostar on the opposite side. Such asymmetric metallic structures lead to distinct wetting and optica..

View full abstract

University of Melbourne Researchers

Grants

Awarded by Australian Research Council via Discovery Grant scheme


Awarded by NSF


Funding Acknowledgements

The authors thank financial support from Australian Research Council via Discovery Grant scheme DP170102208 and FT140100514. D.S. acknowledges the support of a H2020-MSCA individual fellowship. This work was performed in part at the Melbourne Centre for Nanofabrication (MCN) in the Victorian Node of the Australian National Fabrication Facility (ANFF). The authors also gratefully acknowledge the use of facilities at the Monash Centre for Electron Microscopy. They also thank the staff of the SAXS/WAXS beamline at the Australian Synchrotron, Victoria, Australia. CHESS is supported by NSF award DMR-1332208. The authors thank Dr. Ranwen Ou for water contact angle measurement. They also thank Dr. Lim Wei Yap for helping with the Table of Contents image drawing.