Abstract
The present work demonstrates the synthesis of one-dimensional (1D) Se nanorods with ~50 nm diameter by hydrothermal transformation of SnSe crystals in oxalic acid solution and suggests the reaction mechanism for this chemical transformation. SnSe particles react with oxalic acid to generate numerous Se nuclei, which crystallize into Se nanorods due to the intrinsic character of the 1D growth of Se. The resulting Se/SnSe composite exhibits outstanding thermoelectric power factor without the aid of any rare dopants, which is higher than both undoped polycrystalline SnSe and SnSe doped with Pb and Cu.
Highlights
Se is a versatile element in the chalcogenide group that has been widely studied in various fields including chemistry, medicine, ceramics, electronics, and metallurgy
Fourier-transform infrared (FT-IR) spectroscopic analysis was performed to characterize the structure of oxalic acid in solution during the transformation to prove the proposed mechanism
The sample collected after the reaction exhibits a second pattern of X-ray diffraction (XRD) peaks in addition to the primary diffraction pattern of Pnma crystal, originating from the pristine Se, which confirms the presence of transformed Se particles in the product
Summary
Se is a versatile element in the chalcogenide group that has been widely studied in various fields including chemistry, medicine, ceramics, electronics, and metallurgy. This article reports a prospective strategy to synthesize unary Se nanostructures from tin selenide (SnSe) bulk crystals by chemical transformation reaction in oxalic acid solution.
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