Nanostructured SnSe: hydrothermal synthesis and disorder-induced enhancement of thermoelectric properties at medium temperatures

Chen, Wei Hao; Yang, Zihao; Lin, Fei Hung; Liu, Chia‐Jyi

doi:10.1007/s10853-017-1129-z

Cited by 17 publications

(3 citation statements)

References 25 publications

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“…A systematic fall in resistivity with increasing temperature is observed in all of the samples. The room temperature resistivity (Figure 6b) of all of the samples is in good agreement with the value reported in the literature 24,31 for nanostructured SnSe but significantly lower than the value (64 mΩ−m) reported for bulk polycrystalline SnSe. 22 Also, among the different morphologies, R, RF, and FF seem to have well-connected grains that facilitate the transport of charge carriers, while the resistivity of F in the entire temperature regime seems to be slightly higher than others.…”

Section: Resultssupporting

confidence: 89%

Impact of Different Morphological Structures on Physical Properties of Nanostructured SnSe

et al. 2018

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Nanostructured SnSe samples with specific morphologies like rods, rod-flowers, flakes, and flake-flowers were synthesized using the same reactants but with a control over various growth parameters involved in a hydrothermal reaction process. The morphology and detailed microstructure of the obtained samples have been studied by means of field-emission scanning electron microscopy (FE SEM) and high resolution transmission electron microscopy (HR-TEM). The sample quality, homogeneity, and phase purity have been thoroughly studied by selective area electron diffraction (SAED) and X-ray diffraction (XRD) analysis. Crystal structure study by refinement of powder XRD profiles using the least-squares fitting strategy indicates all samples to be pure single phase and provides its lattice parameters. The impact of changing morphology on the electrical, optical, and sensing properties of SnSe has been systematically evaluated. Temperature dependent electrical transport measurements highlight the increasingly 2D nature of the nanoflakes, while the lowest resistivity is obtained for nanorods. The mechanism for charge transport shows a crossover from thermally activated band conduction to a Coulomb interaction induced localization of charge carriers. The optical gap energy and absorbance profile also show a morphology dependent response, as monitored using ultraviolet–visible–near-infrared (UV–vis–NIR) spectroscopy. Resistive sensors for humidity sensing application show quite high sensitivity (∼1500%), good repeatability, low hysteresis in the absorption–desorption process, and good reproducibility at room temperature. Among different SnSe samples, the rod morphology gives the best sensing performance.

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Section: Resultssupporting

confidence: 89%

Impact of Different Morphological Structures on Physical Properties of Nanostructured SnSe

et al. 2018

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“…In the present study, the calculated F ( h 00) values are around 0.34 for all the SnSe- x wt % LaCl 3 ( x = 0.0, 0.5 and 1.0) samples, which reveals that axial the plane is slightly preferentially oriented in the bc -plane. This is reasonable because SnSe crystallized with layered structure can easily exhibit preferential orientation following the uniaxial densification process, and anisotropy has been widely observed in previous studies [ 11 , 12 , 13 , 28 ].…”

Section: Resultsmentioning

confidence: 59%

Enhanced Thermoelectric Properties of Polycrystalline SnSe via LaCl3 Doping

Wang

et al. 2018

Materials

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LaCl3 doped polycrystalline SnSe was synthesized by combining mechanical alloying (MA) process with spark plasma sintering (SPS). It is found that the electrical conductivity is enhanced after doping due to the increased carrier concentration and carrier mobility, resulting in optimization of the power factor at 750 K combing with a large Seebeck coefficient over 300 Μvk−1. Meanwhile, all the samples exhibit lower thermal conductivity below 1.0 W/mK in the whole measured temperature. The lattice thermal conductivity for the doped samples was reduced, which effectively suppressed the increscent of the total thermal conductivity because of the improved electrical conductivity. As a result, a ZT value of 0.55 has been achieved for the composition of SnSe-1.0 wt % LaCl3 at 750 K, which is nearly four times higher than the undoped one and reveals that rare earth element is an effective dopant for optimization of the thermoelectric properties of SnSe.

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“…The low-energy input in turn provides an energy-saving and environmentally green means for fabricating nanostructured materials. There are several successful examples for producing high zT values of thermoelectric materials using solution methods [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

A facile energy-saving route of fabricating thermoelectric Sb ₂ Te ₃ -Te nanocomposites and nanosized Te

et al. 2018

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A facile energy-saving route is developed for fabricating Sb2Te3-Te nanocomposites and nanosized Te powders. The fabrication route not only avoids using organic chemicals, but also keeps the energy consumption to a minimum. The fabrication procedure involves two steps. Energetic precursors of nanosized powders of Sb and Te are produced at room temperature followed by hot pressing at 400°C under 70 MPa for 1 h. The resulting Sb2Te3-Te nanocomposite exhibits enhanced power factor. The dimensionless figure of merit zT value of the Sb2Te3-Te nanocomposite is 0.29 at 475 K.

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Nanostructured SnSe: hydrothermal synthesis and disorder-induced enhancement of thermoelectric properties at medium temperatures

Cited by 17 publications

References 25 publications

Impact of Different Morphological Structures on Physical Properties of Nanostructured SnSe

Impact of Different Morphological Structures on Physical Properties of Nanostructured SnSe

Enhanced Thermoelectric Properties of Polycrystalline SnSe via LaCl3 Doping

A facile energy-saving route of fabricating thermoelectric Sb ₂ Te ₃ -Te nanocomposites and nanosized Te

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Nanostructured SnSe: hydrothermal synthesis and disorder-induced enhancement of thermoelectric properties at medium temperatures

Cited by 17 publications

References 25 publications

Impact of Different Morphological Structures on Physical Properties of Nanostructured SnSe

Impact of Different Morphological Structures on Physical Properties of Nanostructured SnSe

Enhanced Thermoelectric Properties of Polycrystalline SnSe via LaCl3 Doping

A facile energy-saving route of fabricating thermoelectric Sb 2 Te 3 -Te nanocomposites and nanosized Te

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A facile energy-saving route of fabricating thermoelectric Sb ₂ Te ₃ -Te nanocomposites and nanosized Te