Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 18, Pages 8998-9007Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am402064g
Keywords
nanosheets; electrical conductor; metal oxide; turbostratic; HR-TEM; ductile; high anisotropy
Funding
- Energy Materials Center at Cornell (EMC2), an Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, Office of Basic Energy Science [DESC0001086]
- NSF MRSEC program [DMR-1120296]
- National Science Foundation [CHE-1152922]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1152922] Funding Source: National Science Foundation
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Extremely long, electrically conductive, ductile, free-standing nanosheets of water-stabilized KxCoO2 center dot yH(2)O are synthesized using the sol gel and electric-field induced kinetic-demixing (SGKD) process. Room temperature in-plane resistivity of the KxCoO2 center dot yH(2)O nanosheets is less than similar to 4.7 m Omega.cm, which corresponds to one of the lowest resistivity values reported for metal oxide nanosheets. The synthesis produces tens of thousands of very high aspect ratio (50,000:50,000:1 = length/width/thickness), millimeter length nanosheets stacked into a macro-scale pellet. Free-standing nanosheets up to similar to 50 mu m long are readily delaminated from the stacked nanosheets. High-resolution transmission electron microscopy (HR-TEM) studies of the free-standing nanosheets indicate that the delaminated pieces consist of individual nanosheet crystals that are turbostratically stacked. X-ray diffraction (XRD) studies confirm that the nanosheets are stacked in perfect registry along their c-axis. Scanning electron microscopy (SEM) based statistical analysis show that the average thickness of the nanosheets is similar to 13 nm. The nanosheets show ductility with a bending radius as small as similar to 5 nm.
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