scholarly journals Controlled Morphology and Its Effects on the Thermoelectric Properties of SnSe2 Thin Films

Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 942
Author(s):  
Muhammad Siyar ◽  
Maroosha Farid ◽  
Haad Khan ◽  
Malik Adeel Umar ◽  
Waqas Hassan Tanveer ◽  
...  
Keyword(s):  
Reaction Time ◽  
Thermoelectric Properties ◽  
Electrical Transport ◽  
High Efficiency ◽  
Reaction Times ◽  
Synthesis Process ◽  
Electrical Transport Properties ◽  
Phase Purity ◽  
Tin Selenide ◽  
Controlled Morphology

In the last few years, the thermoelectric properties of tin selenide (SnSe) have been explored in much detail due to its high efficiency and green nature, being free of Te and Pb. In the same chalcogenide family, SnSe2 is also a layered structured material, but its thermoelectric potential has not been widely explored experimentally. Since SnSe2 has the layered structure, its electrical transport properties may strongly be affected by its microstructure and morphology. Here, we report the effect of reaction time on the structure, phase, and morphology of the SnSe2 during solvothermal synthesis process. We have studied four SnSe2 samples with different reaction times. The sample obtained after 16 h of reaction time was named as M1, for 20 h M2, similarly for 24 h was M3 and for 48 hours’ time, the sample was named as M4. We investigated its thermoelectric properties and found that phase purity and morphology can affect the thermoelectric performance of the synthesized samples. The peak power factor (PF) value along the ab plane was (0.69 μWcm−1K−2) for the M4 sample at 575 K, which was the highest among all the measured samples. The comparatively larger PF value of sample M4 can be related to the increase in its electrical conductivity due to increase in phase purity and band gap reduction.

scholarly journals Preparation and Characterization of High-Efficiency Magnetic Heavy Metal Capture Flocculants

Water ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 1732
Author(s):  
Yuanyuan Yu ◽  
Yongjun Sun ◽  
Jun Zhou ◽  
Aowen Chen ◽  
Kinjal J. Shah
Keyword(s):  
Heavy Metal ◽  
Reaction Time ◽  
High Efficiency ◽  
Removal Rate ◽  
Low Cost ◽  
Monomer Concentration ◽  
Synthesis Process ◽  
Response Surface Optimization ◽  
Metal Capture ◽  
Total Monomer Concentration

In this study, a high-efficiency magnetic heavy metal flocculant MF@AA was prepared based on carboxymethyl chitosan and magnetic Fe3O4. It was characterized by SEM, FTIR, XPS, XRD and VSM, and the Cu(II) removal rate was used as the evaluation basis for the preparation process. The effects of AMPS content, total monomer concentration, photoinitiator concentration and reaction time on the performance of MF@AA flocculation to remove Cu(II) were studied. The characterization results show that MF@AA has been successfully prepared and exhibits good magnetic induction characteristics. The synthesis results show that under the conditions of 10% AMPS content, 35% total monomer concentration, 0.04% photoinitiator concentration, and 1.5 h reaction time, the best yield of MF@AA is 77.69%. The best removal rate is 87.65%. In addition, the response surface optimization of the synthesis process of MF@AA was performed. The optimal synthesis ratio was finally determined as iron content 6.5%, CMFS: 29.5%, AM: 53.9%, AMPS: 10.1%. High-efficiency magnetic heavy metal flocculant MF@AA shows excellent flocculation performance in removing Cu(II). This research provides guidance and ideas for the development of efficient and low-cost flocculation technology to remove Cu(II) in wastewater.

scholarly journals Outstanding thermoelectric properties of solvothermal-synthesized Sn1−3xInxAg2xTe micro-crystals through defect engineering and band tuning

2020 ◽  
Vol 8 (7) ◽  
pp. 3978-3987 ◽  
Author(s):  
Raza Moshwan ◽  
Wei-Di Liu ◽  
Xiao-Lei Shi ◽  
Qiang Sun ◽  
Han Gao ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Transport Properties ◽  
Valence Band ◽  
Thermoelectric Properties ◽  
Electrical Transport ◽  
Energy Levels ◽  
Resonance Energy ◽  
Defect Engineering ◽  
Electrical Transport Properties ◽  
Co Doping

In eco-friendly SnTe thermoelectrics, In and Ag co-doping induces the synergistic effect of resonance energy levels and valence band convergence to enhance its electrical transport properties, while defects ameliorates its thermal transport.

scholarly journals Synthesis process and thermoelectric properties of n-type tin selenide thin films

2018 ◽  
Vol 763 ◽  
pp. 960-965 ◽  
Author(s):  
Wen-ting Wang ◽  
Zhuang-hao Zheng ◽  
Fu Li ◽  
Cao Li ◽  
Ping Fan ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermoelectric Properties ◽  
Synthesis Process ◽  
Tin Selenide

Thermoelectric properties of polycrystalline Bi2Se3−x by powder compaction sintering

2020 ◽  
Vol 34 (18) ◽  
pp. 2050206
Author(s):  
Ying Zhou ◽  
Zhenhua Ge ◽  
Jun Guo ◽  
Jing Feng
Keyword(s):  
Electrical Conductivity ◽  
Seebeck Coefficient ◽  
Carrier Concentration ◽  
Thermoelectric Properties ◽  
Thermoelectric Materials ◽  
Electrical Transport ◽  
Bulk Material ◽  
Powder Compaction ◽  
Electrical Transport Properties ◽  
X Ray

[Formula: see text] is a [Formula: see text] compound (where Pn = Bi and Sb, Ch = Te, Se, and S), which has attracted increasing attention as a candidate for use in thermoelectric applications. Previous studies demonstrated the advantage of [Formula: see text] thermoelectric materials, despite an inferior thermoelectric performance. Herein, a series of [Formula: see text] ([Formula: see text], 0.10, 0.15, 0.20, and 0.25) thermoelectric materials were prepared by powder compaction sintering. The effects of phase structures and microstructure of the [Formula: see text] bulk material were analyzed by X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The thermoelectric properties, including Seebeck coefficient, electrical conductivity, and thermal conductivity, were measured systematically. The results show that carrier concentration increased with decreasing Se content, which in turn affected the electrical transport properties. Low Se contents gave larger power factor (PF) values than the pristine [Formula: see text] sample, the maximum PF value being [Formula: see text] at 320 K for [Formula: see text]. The variation in PF was attributed to the variations in electrical conductivity [Formula: see text] and Seebeck coefficient [Formula: see text] upon optimizing Se content. The [Formula: see text] samples showed an enhanced thermoelectric figure of merit (ZT) with increasing measurement temperature, due to the increased [Formula: see text] value, [Formula: see text], and decreased [Formula: see text]. The [Formula: see text] sample exhibited the highest ZT (0.28) at 575 K, while [Formula: see text] exhibited the lowest ZT (0.14) at 325 K. This indicated that tuning Se content was an effective way to enhance carrier concentration.

Fabrication and Thermoelectric Properties of Bi2Te3 Prepared by Combining Chemical Bath Method and Hot Pressing

2013 ◽  
Vol 743-744 ◽  
pp. 65-69 ◽  
Author(s):  
Feng Yuan Li ◽  
Yuan Yuan Wang ◽  
Song Chen ◽  
Zhen Qin ◽  
Ke Feng Cai
Keyword(s):  
Thermoelectric Properties ◽  
Electrical Transport ◽  
Hot Pressing ◽  
X Ray Diffraction ◽  
Electrical Transport Properties ◽  
Bulk Materials ◽  
X Ray ◽  
Synthesis Conditions ◽  
Sulfur Addition ◽  
Before And After

Bi2Te3 bulk materials were prepared by combining chemical bath method and hot pressing at 80 MPa and 375 °C for 1 h. The samples before and after hot pressing were examined by X-ray diffraction, and the fracture surface of the bulk materials was observed by field emission scanning electron microscopy (FESEM). The electrical transport properties of the bulk materials were measured from room temperature up to 250 °C under Ar. The results indicate that sulfur addition can prevent the oxidation of Bi2Te3 nanostructures; however, it is not good to the thermoelectric properties of Bi2Te3 under the present synthesis conditions.

Enhanced thermoelectric properties of polycrystalline BiCuSeO via dual-doping in Bi sites

2019 ◽  
Vol 6 (3) ◽  
pp. 799-807 ◽  
Author(s):  
Fu Li ◽  
Min Ruan ◽  
Yuexing Chen ◽  
Wenting Wang ◽  
Jingting Luo ◽  
...  
Keyword(s):  
Transport Properties ◽  
Thermoelectric Properties ◽  
Electrical Transport ◽  
Electrical Transport Properties ◽  
Co Doped

Enhanced electrical transport properties are achieved for La, Pb co-doped BiCuSeO, resulting in optimized thermoelectric properties.

scholarly journals Tailoring the structure and thermoelectric properties of BaTiO3via Eu2+ substitution

2017 ◽  
Vol 19 (21) ◽  
pp. 13469-13480 ◽  
Author(s):  
Xingxing Xiao ◽  
Marc Widenmeyer ◽  
Wenjie Xie ◽  
Tianhua Zou ◽  
Songhak Yoon ◽  
...  
Keyword(s):  
Transport Properties ◽  
Valence Band ◽  
Thermoelectric Properties ◽  
Electrical Transport ◽  
Electrical Transport Properties

The presence of filled Eu2+ 4f states at the top of the valence band significantly affect the electrical transport properties of Ba1−xEuxTiO3−δ compounds.

Ternary Skutterudites: Anion Ordering and Thermoelectric Properties

2007 ◽  
Vol 1044 ◽  
Author(s):  
Paz Vaqueiro ◽  
Gerard G. Sobany
Keyword(s):  
Seebeck Coefficient ◽  
Transport Properties ◽  
Thermoelectric Properties ◽  
Powder Diffraction ◽  
Diffraction Data ◽  
Electrical Transport ◽  
Powder Diffraction Data ◽  
Electrical Transport Properties ◽  
Electrical Resistivities ◽  
Thermal Conductivities

AbstractThe ternary skutterudites AB1.5Q1.5 (A = Co, Rh, Ir, B =Ge, Sn and Q = S, Te) have been synthesized and structurally characterised. Powder diffraction data are consistent with the presence of anion ordering, which results in a lowering of the symmetry from cubic to rhombohedral. The ordered skutterudite structure contains rhomboidal four-membered B2Q2 rings, instead of the homonuclear rectangular rings found in binary skutterudites. The electrical transport properties of the AB1.5Q1.5 phases are consistent with semiconducting behaviour, and large values of the Seebeck coefficient have been observed for several of these materials. While their large electrical resistivities might make these materials unsuitable for thermoelectric applications unless significant improvements can be achieved by doping, these materials also exhibit significantly lower thermal conductivities than their binary counterparts.

Thermoelectric Properties of Bi2Te3 Alloy Prepared by Mechanical Alloying and Spark Plasma Sintering

2008 ◽  
Vol 368-372 ◽  
pp. 538-540 ◽  
Author(s):  
Min Zhou ◽  
Jing Feng Li ◽  
Jing Liu
Keyword(s):  
Mechanical Alloying ◽  
Spark Plasma Sintering ◽  
Thermoelectric Properties ◽  
Electrical Transport ◽  
Measuring System ◽  
Alloy Formation ◽  
Electrical Transport Properties ◽  
Powder Synthesis ◽  
Plasma Sintering ◽  
Spark Plasma

The Bi2Te3 compound was synthesized by mechanical alloying (MA) of highly pure constituents of Bi and Te powders, and then was consolidated by spark plasma sintering (SPS) method. The MA-derived alloy formation was characterized by X-ray diffraction (XRD), and the microstructure change was investigated through scanning electron microscopy (SEM). The thermoelectric properties were measured using a Seebeck Coefficient/Electrical Resistance Measuring System. The influence of MA time on the thermoelectric properties of the SPS-sintered samples was investigated to find the optimal MA condition for the powder synthesis and thermoelectric properties. The obtained results showed that the sample with the MA time of 6 h exhibited the optimal electrical transport properties. The maximum power factor of over 2.0 × 10-3 W/m K2 was obtained between 323 K and 423 K.

Investigation of electrical transport properties of Bi0.5Sb1.5Te2.7Se0.3 alloys prepared by high-pressure method

2015 ◽  
Vol 08 (05) ◽  
pp. 1550055 ◽  
Author(s):  
Xin Guo ◽  
Xiaopeng Jia ◽  
Yuewen Zhang ◽  
Hairui Sun ◽  
Bing Sun ◽  
...  
Keyword(s):  
High Pressure ◽  
Electrical Resistivity ◽  
Seebeck Coefficient ◽  
Transport Properties ◽  
Electrical Transport ◽  
Room Temperature ◽  
Synthesis Process ◽  
Electrical Transport Properties ◽  
Pressure Method ◽  
Measurement Results

The quaternary Bi 0.5 Sb 1.5 Te 2.7 Se 0.3 alloys have been successfully synthesized within 25 min by high-pressure method. The pressure-dependent electrical transport properties of the as-prepared Bi 0.5 Sb 1.5 Te 2.7 Se 0.3 alloys are carefully investigated at room temperature. The measurement results indicate that the electrical resistivity and the Seebeck coefficient reveal a strong correlation with the increase of synthesis pressure. The carrier concentration and mobility are modulated effectively due to the effects of synthesis pressure and composition, leading to an improvement in the power factor of Bi 0.5 Sb 1.5 Te 2.7 Se 0.3. These results suggest that the utilization of pressure during the synthesis process provides an effective and controllable strategy to optimize the electrical transport properties of the ( Bi , Sb )2( Te , Se )3 alloys.

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