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Synthesis and Thermoelectric Properties of Copper Sulfides via Solution Phase Methods and Spark Plasma Sintering
- Source :
- Crystals; Volume 7; Issue 5; Pages: 141, Crystals, Vol 7, Iss 5, p 141 (2017)
- Publication Year :
- 2017
- Publisher :
- Multidisciplinary Digital Publishing Institute, 2017.
-
Abstract
- Large-scale Cu2S tetradecahedrons microcrystals and sheet-like Cu2S nanocrystals were synthesized by employing a hydrothermal synthesis (HS) method and wet chemistry method (WCM), respectively. The morphology of α-Cu2S powders prepared by the HS method is a tetradecahedron with the size of 1–7 μm. The morphology of β-Cu2S is a hexagonal sheet-like structure with a thickness of 5–20 nm. The results indicate that the morphologies and phase structures of Cu2S are highly dependent on the reaction temperature and time, even though the precursors are the exact same. The polycrystalline copper sulfides bulk materials were obtained by densifying the as-prepared powders using the spark plasma sintering (SPS) technique. The electrical and thermal transport properties of all bulk samples were measured from 323 K to 773 K. The pure Cu2S bulk samples sintered by using the powders prepared via HS reached the highest thermoelectric figure of merit (ZT) value of 0.38 at 573 K. The main phase of the bulk sample sintered by using the powder prepared via WCM changed from β-Cu2S to Cu1.8S after sintering due to the instability of β-Cu2S during the sintering process. The Cu1.8S bulk sample with a Cu1.96S impurity achieved the highest ZT value of 0.62 at 773 K.
- Subjects :
- Materials science
General Chemical Engineering
Spark plasma sintering
Sintering
chemistry.chemical_element
02 engineering and technology
010402 general chemistry
01 natural sciences
Cu2S
Inorganic Chemistry
nanocrystal
synthetic methods
morphological control
thermoelectric properties
Impurity
Phase (matter)
Thermoelectric effect
lcsh:QD901-999
Hydrothermal synthesis
General Materials Science
Metallurgy
021001 nanoscience & nanotechnology
Condensed Matter Physics
Copper
0104 chemical sciences
Chemical engineering
chemistry
lcsh:Crystallography
0210 nano-technology
Wet chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 20734352
- Database :
- OpenAIRE
- Journal :
- Crystals; Volume 7; Issue 5; Pages: 141
- Accession number :
- edsair.doi.dedup.....0bc6771801e06f9d9fa1e9f3eb3b68cb
- Full Text :
- https://doi.org/10.3390/cryst7050141