title: 2D Chalcogenide Nanoplate Assemblies for Thermoelectric Applications.
abstract: Engineered atomic dislocations have been used to create a novel, Sb2Te3nanoplate-like architecture that exhibits a unique antisymmetric chirality. High-resolution transmission electron microscopy (HRTEM) coupled with atomic force microscopy and X-ray photoelectron spectroscopy reveals the architectures to be extremely well ordered with little residual strain. Surface modification of these topologically complex macrostructures (≈3 µm) has been achieved by direct growth of metallic Ag nanoparticles onto the edge sites of the Sb2Te3. Again, HRTEM shows this nanoparticle decoration to be atomically sharp at the boundaries and regularly spaced along the selvedge of the nanostructure. Transport experiments of densified films of these assemblies exhibit marked increases in carrier density after nanoengineering, yielding 3.5 × 104S m-1in electrical conductivity. An increased Seebeck coefficient by 20% in parallel with electrical conductivity is also observed. This gives a thermoelectric power factor of 371 µW m-1K-2, which is the highest value for a flexible, freestanding film to date. These results suggest an entirely new direction in the search for wearable power harvesters based on topologically complex, low-dimensional nanoassemblies.
authors.affiliation: Center for Nanotechnology and Molecular Materials, Department of Physics, Wake Forest University, Winston-Salem, NC, 27109, USA.
authors.forename: Chaochao
authors.initials: C
authors.lastname: Dun
authors.affiliation: Center for Nanotechnology and Molecular Materials, Department of Physics, Wake Forest University, Winston-Salem, NC, 27109, USA.
authors.forename: Corey A
authors.initials: CA
authors.lastname: Hewitt
authors.affiliation: Physical Science Department, IBM TJ Watson Center, Yorktown Heights, NY, 10598, USA.
authors.forename: Qi
authors.initials: Q
authors.lastname: Li
authors.affiliation: Center for Nanotechnology and Molecular Materials, Department of Physics, Wake Forest University, Winston-Salem, NC, 27109, USA.
authors.forename: Junwei
authors.initials: J
authors.lastname: Xu
authors.affiliation: Center for Nanotechnology and Molecular Materials, Department of Physics, Wake Forest University, Winston-Salem, NC, 27109, USA.
authors.forename: Drew C
authors.initials: DC
authors.lastname: Schall
authors.affiliation: Center for Nanotechnology and Molecular Materials, Department of Physics, Wake Forest University, Winston-Salem, NC, 27109, USA.
authors.forename: Hyunsu
authors.initials: H
authors.lastname: Lee
authors.affiliation: Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China.
authors.forename: Qike
authors.initials: Q
authors.lastname: Jiang
authors.affiliation: Center for Nanotechnology and Molecular Materials, Department of Physics, Wake Forest University, Winston-Salem, NC, 27109, USA.
authors.forename: David L
authors.initials: DL
authors.lastname: Carroll
keywords: 2D chalcogenides; decouple; flexible thermoelectrics; nano-heterostructures; screw dislocations