Growth of Large-Area, Free-Standing, Ultrathin 2D Nanomaterials at Solution Interface
Abstract
The development of large and ultrathin nanosheets has been focused on naturally layered materials the van der Waals solids, such asgraphene and transition metal dichalcogenides. Bottom-up synthesis of nanosheets of non-layered materials has been unsatisfactory andlimited success has been achieved on nanosheets with sizes below a few hundred nanometers. In this project, We demonstrated thatsurfactant monolayers could serve as a floating template supporting the nucleation and growth of 2D nanomaterials in large area beyond thelimitation of van der Waals solids. Through this approach, 2 to 3 nm thick, monocrystalline ZnO nanosheets with sizes up to tens of micronswere synthesized. They are freestanding and densely distributed at the water-air interface without any overlapping. The nanosheets arereadily to be transferred onto arbitrary substrates for further device fabrication. Compared with conventional expitaxy where substrate andgrown material must match in lattice parameters, ionic layer epitaxy emplys the surfactant monolayer whose packing density adapts to thesub-phase metal ions and guides the epitaxial growth of inorganic nanosheets. Despite the infamous doping asymmetry of ZnO, thenanosheets showed the rare and most coveted p-type conductivity.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 21, 2015
- Accession Number
- AD1001349
Entities
People
- Fei Wang
- Xudong Wang
Organizations
- University of Wisconsin–Madison