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Lijun Wang, Siyi Chang, Shuqi Zheng, Teng Fang, Wenlin Cui, Pengpeng Bai, Luo Yue, Zhigang Chen
Extensive attention has been focused on thermoelectric performance optimization of SnTe because of its potential in waste heat recovery. Here, we fabricate high thermoelectric performance Se/Cd co-doped SnTe octahedral particles by microwave-stimulated solvothermal method. The SnTe-based octahedral particles have the sizes ranging from several micrometers to hundreds of nanometers, forming dense bulks after spark plasma sintering. Combined with the strong point defect scattering by Se and Cd dopants, a low thermal conductivity of 1...
June 22, 2017: ACS Applied Materials & Interfaces
Min Zhong, Shuai Li, Hou-Jian Duan, Liang-Bin Hu, Mou Yang, Rui-Qiang Wang
We investigate the thermoelectric effect on a topological insulator surface with particular interest in impurity-induced resonant states. To clarify the role of the resonant states, we calculate the dc and ac conductivities and the thermoelectric coefficients along the longitudinal direction within the full Born approximation. It is found that at low temperatures, the impurity resonant state with strong energy de-pendence can lead to a zero-energy peak in the dc conductivity, whose height is sensitively dependent on the strength of scattering potential, and even can reverse the sign of the thermopower, implying the switching from n- to p-type carriers...
June 21, 2017: Scientific Reports
Rafael Santos, Mitchell Nancarrow, Shi Xue Dou, Sima Aminorroaya Yamini
Magnesium-based thermoelectric materials (Mg2X, X = Si, Ge, Sn) have received considerable attention due to their availability, low toxicity, and reasonably good thermoelectric performance. The synthesis of these materials with high purity is challenging, however, due to the reactive nature and high vapour pressure of magnesium. In the current study, high purity single phase n-type Mg2Ge has been fabricated through a one-step reaction of MgH2 and elemental Ge, using spark plasma sintering (SPS) to reduce the formation of magnesium oxides due to the liberation of hydrogen...
June 21, 2017: Scientific Reports
Zhen-Hua Ge, Dongsheng Song, Xiaoyu Chong, Fengshan Zheng, Lei Jin, Xin Qian, Lei Zheng, Rafal E Dunin-Borkowski, Peng Qin, Jing Feng, Li-Dong Zhao
We report high thermoelectric performance in p-type polycrystalline SnSe by the synergistic tailoring of band structures and all-length-scale phonon scattering via (Na, K) co-doping. The energy offsets of multiple valence bands in SnSe are decreased after Na doping and further reduced by (Na, K) co-doping, resulting in an enhancement in the Seebeck coefficient and an increase in the power factor to 492 μWm-1K-2. The lattice thermal conductivity of polycrystalline SnSe is decreased by the introduction of effective phonon scattering centers, such as point defects and anti-phase boundaries...
June 21, 2017: Journal of the American Chemical Society
Shrayesh N Patel, Anne M Glaudell, Kelly A Peterson, Elayne M Thomas, Kathryn A O'Hara, Eunhee Lim, Michael L Chabinyc
The electrical performance of doped semiconducting polymers is strongly governed by processing methods and underlying thin-film microstructure. We report on the influence of different doping methods (solution versus vapor) on the thermoelectric power factor (PF) of PBTTT molecularly p-doped with F n TCNQ (n = 2 or 4). The vapor-doped films have more than two orders of magnitude higher electronic conductivity (σ) relative to solution-doped films. On the basis of resonant soft x-ray scattering, vapor-doped samples are shown to have a large orientational correlation length (OCL) (that is, length scale of aligned backbones) that correlates to a high apparent charge carrier mobility (μ)...
June 2017: Science Advances
Lukas Dobusch, Simone Schuler, Vasili Perebeinos, Thomas Mueller
Layered transition metal dichalcogenide semiconductors, such as MoS2 and WSe2 , exhibit a range of fascinating properties and are being currently explored for a variety of electronic and optoelectronic devices. These properties include a low thermal conductivity and a large Seebeck coefficient, which make them promising for thermoelectric applications. Moreover, transition metal dichalcogenides undergo an indirect-to-direct bandgap transition when thinned down in thickness, leading to strong excitonic photo- and electroluminescence in monolayers...
June 19, 2017: Advanced Materials
Azhar Ali, Yixi Chen, Venkata Vasiraju, Sreeram Vaddiraju
Research on thermoelectrics has seen a huge resurgence since the early 1990s. The ability of tuning a material's electrical and thermal transport behavior upon nanostructuring has led to this revival. Nevertheless, thermoelectric performances of nanowires and related materials lag far behind those achieved with thin-film superlattices and quantum dot-based materials. This is despite the fact that nanowires offer many distinct advantages in enhancing the thermoelectric performances of materials. The simplicity of the strategy is the first and foremost advantage...
June 19, 2017: Nanotechnology
Dianta Ginting, Chan-Chieh Lin, Lydia Rathnam, Junpil Hwang, Woochul Kim, Rabih Al Rahal Al Orabi, Jong-Soo Rhyee
The data presented in this article are related to the research article entitled "High thermoelectric performance in pseudo quaternary compounds of (PbTe)0.95-x (PbSe)x(PbS)0.05 by simultaneous band convergence and nano precipitation" (Ginting et al., 2017) [1]. We measured electrical and thermal transport properties such as temperature-dependent Hall carrier density nH , Hall mobility μH , thermal diffusivity D, heat capacity Cp , and power factor S(2)σ in (PbTe)0.95-x (PbSe)x(PbS)0.05 (x=0.0, 0.05, 0.10, 0...
August 2017: Data in Brief
Manisha Samanta, Kanishka Biswas
GeTe and its derivatives constituting Pb-free elements are well known as potential thermoelectric materials for the last five decades which offer paramount technological importance. The main constrain in the way of optimizing thermoelectric performance of GeTe is the high lattice thermal conductivity (κlat). Herein, we demonstrate low κlat (~0.7 W/mK) and significantly high thermoelectric figure of merit (ZT = 2.1 at 630 K) in Sb doped pseudoternary (GeTe)1-2x(GeSe)x(GeS)x system by two step strategies. (GeTe)1-2x(GeSe)x(GeS)x system provides an excellent podium to investigate competition between entropy driven solid solution and enthalpy driven phase separation...
June 17, 2017: Journal of the American Chemical Society
Shun Wan, Xiangyang Huang, Pengfei Qiu, Xun Shi, Lidong Chen
In the past two decades, many studies have focused on the effects of electronpositive guest fillers on the electrical and thermal transport properties in CoSb3-based skutterudites. Recently some electronegative elements such as S, Se, Cl and Br have been filled into the voids in CoSb3 with a small amount of n-type dopant Te on the Sb sites. In this report, self-charge compensated skutterudites SeyCo4Sb12-xSex (0 < x + y < 0.9) with Se occupying two different atomic sites have been fabricated by a traditional melting-annealing process combined with spark plasma sintering method...
June 13, 2017: ACS Applied Materials & Interfaces
Guoping Ren, Jiaqing Yan, Guoxian Tao, Yunmeng Gan, Donghong Li, Xi Yan, Yongjuan Fu, Leiming Wang, Weimin Wang, Zhiming Zhang, Feng Yue, Xiaofeng Yang
Rapid focal cooling is an attractive nondestructive strategy to control and possibly prevent focal seizures. However, the temperature threshold necessary to abort seizures in primates is still unknown. Here, we explored this issue in a primate epilepsy model and observed the effect of rapid cooling on different electroencephalogram frequency bands, aiming at providing necessary experimental data for future clinical translational studies and exploring the mechanism of focal cooling in terminating seizures. We induced focal neocortical seizures using microinjection of 4-aminopyridine into premotor cortex in five anesthetized cynomolgus monkeys...
June 7, 2017: Experimental Neurology
Hazel Reardon, Anders B Blichfeld, Hidetaka Kasai, Hao Yin, Espen Drath Bøjesen, Bo B Iversen
Inconsistencies in high temperature thermoelectric property measurements of Ba8Ga16Ge30 have prompted our study on the thermal stability of this heavily studied inorganic clathrate. Using X-ray diffraction, thermal analysis, and imaging techniques on both powder and spark plasma sintered pelletized samples, we probe the structure and decomposition characteristics of this important high temperature thermoelectric material. We demonstrate that the decomposition of Ba8Ga16Ge30 is extremely dependent on the heating conditions employed and, as a result of the slow decomposition kinetics of the clathrate, reveal that the true stability of this system has been overlooked in the extensive literature available...
June 21, 2017: Physical Chemistry Chemical Physics: PCCP
Motohiro Nakano, Takuya Nakashima, Tsuyoshi Kawai, Yoshiyuki Nonoguchi
Single-walled carbon nanotubes are promising candidates for light-weight and flexible energy materials. Recently, the thermoelectric properties of single-walled carbon nanotubes have been dramatically improved by ionic liquid addition; however, controlling factors remain unsolved. Here the thermoelectric properties of single-walled carbon nanotubes enhanced by electrolytes are investigated. Complementary characterization with absorption, Raman, and X-ray photoelectron spectroscopy reveals that shallow hole doping plays a partial role in the enhanced electrical conductivity...
June 8, 2017: Small
Yu Zhang, Yun Zheng, Kun Rui, Huey Hoon Hng, Kedar Hippalgaonkar, Jianwei Xu, Wenping Sun, Jixin Zhu, Qingyu Yan, Wei Huang
Recent progress in the currently available methods of producing black phosphorus bulk and phosphorene are presented. The effective passivation approaches toward improving the air stability of phosphorene are also discussed. Furthermore, the research efforts on the phosphorene and phosphorene-based materials for potential applications in lithium ion batteries, sodium ion batteries, and thermoelectric devices are summarized and highlighted. Finally, the outlook including challenges and opportunities in these research fields are discussed...
June 8, 2017: Small
Qiaoming Wang, Liangliang Yang, Shengwen Zhou, Xianjun Ye, Zhe Wang, Wenguang Zhu, Matthew D McCluskey, Yi Gu
We demonstrate a van der Waals Schottky junction defined by crystalline phases of multilayer In2Se3. Besides ideal diode behaviors and the gate-tunable current rectification, the thermoelectric power is significantly enhanced in these junctions, by more than 3 orders of magnitude, compared to single-phase multilayer In2Se3, with the thermoelectric figure-of-merit approaching ~ 1 at room temperature. Our results suggest that these significantly improved thermoelectric properties are not due to the two-dimensional (2D) quantum confinement effects, but instead are a consequence of the Schottky barrier at the junction interface, which leads to hot carrier transport and shift the balance between thermally and field-driven currents...
June 8, 2017: Journal of Physical Chemistry Letters
Nianduan Lu, Ling Li, Ming Liu
Correction for 'A review of carrier thermoelectric-transport theory in organic semiconductors' by Nianduan Lu et al., Phys. Chem. Chem. Phys., 2016, 18, 19503-19525.
June 21, 2017: Physical Chemistry Chemical Physics: PCCP
Yoon-Jun Kim, Li-Dong Zhao, Mercouri G Kanatzidis, David N Seidman
The dimensionless figure of merit, ZT, of bulk thermoelectric materials depends mainly on the transport properties of charge carriers and heat carrying phonons. PbTe-4 mol.% SrTe doped with 2 mol.% Na (Pb0.94Na0.02Sr0.04Te) is a nanostructured material system, which exhibits a ZT higher than 2. A precipitate size distribution (PSD) of SrTe precipitates is believed to play a key role. This raises the question of whether its performance is limited by precipitate coarsening (Ostwald ripening) at elevated temperatures...
June 7, 2017: ACS Applied Materials & Interfaces
Jason D Forster, Jared J Lynch, Nelson E Coates, Jun Liu, Hyejin Jang, Edmond Zaia, Madeleine P Gordon, Maxime Szybowski, Ayaskanta Sahu, David G Cahill, Jeffrey J Urban
Thermoelectric power generation can play a key role in a sustainable energy future by converting waste heat from power plants and other industrial processes into usable electrical power. Current thermoelectric devices, however, require energy intensive manufacturing processes such as alloying and spark plasma sintering. Here, we describe the fabrication of a p-type thermoelectric material, copper selenide (Cu2Se), utilizing solution-processing and thermal annealing to produce a thin film that achieves a figure of merit, ZT, which is as high as its traditionally processed counterpart, a value of 0...
June 5, 2017: Scientific Reports
Galen T Craven, Abraham Nitzan
A theory is developed to describe the coupled transport of energy and charge in networks of electron donor-acceptor sites which are seated in a thermally heterogeneous environment, where the transfer kinetics are dominated by Marcus-type hopping rates. It is found that the coupling of heat and charge transfer in such systems gives rise to exotic transport phenomena which are absent in thermally homogeneous systems and cannot be described by standard thermoelectric relations. Specifically, the directionality and extent of thermal transistor amplification and cyclical electronic currents in a given network can be controlled by tuning the underlying temperature gradient in the system...
May 19, 2017: Physical Review Letters
Shivam Kansara, Sanjeev K Gupta, Yogesh Sonvane, Igor Lukačević
We present the electronic, magnetic, thermoelectric and optical properties of ferromagnetic metal nanowires (NWs) made of iron (Fe) and cobalt (Co) atoms using a first principles approach. Each property has been investigated as a function of atomic arrangement and nanowire diameter. Magnetic anisotropy is predicted originating from the spin-orbit coupling. Significant delocalization of electronic charge density is found in Fe nanowires with the increase in nanowire diameter, while the charge distribution anisotropy manifests in all the studied nanowire configurations...
June 14, 2017: Physical Chemistry Chemical Physics: PCCP
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