Abstract
AbstractA surfactant‐free solution methodology, simply using water as a solvent, has been developed for the straightforward synthesis of single‐phase orthorhombic SnSe nanoplates in gram quantities. Individual nanoplates are composed of {100} surfaces with {011} edge facets. Hot‐pressed nanostructured compacts (Eg≈0.85 eV) exhibit excellent electrical conductivity and thermoelectric power factors (S2σ) at 550 K. S2σ values are 8‐fold higher than equivalent materials prepared using citric acid as a structure‐directing agent, and electrical properties are comparable to the best‐performing, extrinsically doped p‐type polycrystalline tin selenides. The method offers an energy‐efficient, rapid route to p‐type SnSe nanostructures.
Highlights
A surfactant-free solution methodology, using water as a solvent, has been developed for the straightforward synthesis of single-phase orthorhombic SnSe nanoplates in gram quantities
The thermoelectric conversion efficiency of a material is determined by its dimensionless figure of merit, Z T = S2sT/k, where S, s, T, and k represent the Seebeck coefficient, electrical conductivity, absolute temperature, and thermal conductivity, respectively.[2]
We demonstrate a surfactant-free aqueous solution approach towards the preparation of > 10 g of SnSe nanoplates, by boiling a mixture of NaHSe and Na2SnO2 solutions for 2 h
Summary
A surfactant-free solution methodology, using water as a solvent, has been developed for the straightforward synthesis of single-phase orthorhombic SnSe nanoplates in gram quantities. Combined with SAED data, the nanoplate face can be identified as the bc plane of SnSe and the side facets are defined by {011} planes (Figures 1 c, S4).
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