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Yah Yun Aw, Cheow Keat Yeoh, Muhammad Asri Idris, Pei Leng Teh, Khairul Amali Hamzah, Shulizawati Aqzna Sazali
Fused deposition modelling (FDM) has been widely used in medical appliances, automobile, aircraft and aerospace, household appliances, toys, and many other fields. The ease of processing, low cost and high flexibility of FDM technique are strong advantages compared to other techniques for thermoelectric polymer composite fabrication. This research work focuses on the effect of two crucial printing parameters (infill density and printing pattern) on the tensile, dynamic mechanical, and thermoelectric properties of conductive acrylonitrile butadiene styrene/zinc oxide (CABS/ZnO composites fabricated by FDM technique...
March 22, 2018: Materials
Fuat Erden, Hui Li, Xizu Wang, FuKe Wang, Chaobin He
In the present work, we report the fabrication of high-performance thermoelectric materials using TiO2/CNT/PANI ternary composites. We showed that a conductivity of ∼2730 S cm-1 can be achieved for the binary CNT (70%)/PANI (30%) composite, which is the highest recorded value for the reported CNT/PANI composites. We further demonstrated that the Seebeck coefficient of CNT/PANI composites could be enhanced by incorporating TiO2 nanoparticles into the binary CNT/PANI composites, which could be attributed to lower carrier density and the energy scattering of low-energy carriers at the interfaces of TiO2/a-CNT and TiO2/PANI...
March 22, 2018: Physical Chemistry Chemical Physics: PCCP
Trajče Stafilov, Robert Šajn, Mila Arapčeska, Ivan Kungulovski, Jasminka Alijagić
The results of the systematic study of the spatial distribution of trace metals in surface soil over the Bitola region, Republic of Macedonia, known for its coal mine and thermo-electrical power plant activities are reported. The investigated region (3200 km2 ) is covered by a sparse sampling grid of 5 × 5 km, but in the urban zone and around the thermoelectric power plant the sampling grid is denser (1 × 1 km). In total, 229 soil samples from 149 locations were collected including top-soil (0-5 cm) and bottom-soil samples (20-30 cm and 0-30 cm)...
March 19, 2018: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
Hyun Ju, Dabin Park, Jooheon Kim
The fabrication of dodecylbenzenesulfonic acid (DBSA)-doped polyaniline (PANI)-coated SnSe0.8S0.2 (PANI-SnSeS) nanosheets and their application to flexible thermoelectric composite films are demonstrated. The thermoelectric power factor of PANI-SnSeS nanosheets was optimized by manipulating the number of PANI coating cycles, and changes in their electrical conductivity and Seebeck coefficient were investigated and analyzed by considering carrier transport properties. An optimized, solution-based procedure for introducing inorganic nanoparticles comprising PANI-SnSeS nanosheets into a polyvinylidene fluoride (PVDF) matrix maximized the power factor...
March 19, 2018: ACS Applied Materials & Interfaces
Arjun Mani, Colin Benjamin
The thermoelectric properties of a three-terminal quantum spin Hall (QSH) sample are examined. The inherent helicity of the QSH sample helps to generate a large charge power efficiently. Along with charge the system can be designed to work as a highly efficient spin heat engine too. The advantage of a helical over a chiral sample is that, while a multiterminal quantum Hall sample can only work as a quantum heat engine due to broken time reversal (TR) symmetry, a multiterminal QSH system can work effectively as both a charge or spin heat engine and as a charge or spin refrigerator as the TR symmetry is preserved...
February 2018: Physical Review. E
Changlong Liu, Lin Wang, Xiaoshuang Chen, Jing Zhou, Weiwei Tang, Wanlong Guo, Jin Wang, Wei Lu
The present work reports on a graphene-like material that is promising for photodetection applications due to its high optical absorption and layer-dependent properties. To date, only narrowband photodetectors have been realized; therefore, extending the working wavelength is becoming more imperative for applications such as high-contrast imaging and remote sensing. In this work, we developed a novel detection technique that provides enhanced performance across the infrared and terahertz bands by using an antenna-assisted top-gated black phosphorus phototransistor...
March 16, 2018: Nanoscale
Yu Liu, Yu Zhang, Silvia Ortega, Maria Ibáñez, Khak Ho Lim, Albert Grau Carbonell, Sara Martí-Sànchez, Ka Ming Ng, Jordi Arbiol, Maksym V Kovalenko, Doris Cadavid, Andreu Cabot
Bottom-up approaches for producing bulk nanomaterials have traditionally lacked control over the crystallographic alignment of nanograins. This limitation has prevented nanocrystal-based nanomaterials from achieving optimized performances in numerous applications. Here we demonstrate the production of nanostructured BixSb2-xTe3 alloys with controlled stoichiometry and crystallographic texture through proper selection of the starting building blocks and the adjustment of the nanocrystal-to-nanomaterial consolidation process...
March 16, 2018: Nano Letters
Carrie L McCarthy, Richard L Brutchey
Solution processing has emerged as a promising option for the preparation of functional materials with methods that tend to be cheap, less energy intensive, and allow for high throughput and large area deposition. A recently developed method, whereby a binary thiol-amine solvent mixture is used to dissolve bulk oxides, chalcogenides, or elemental materials to yield molecular precursor inks for the deposition of phase pure chalcogenide materials, has recently garnered attention for applications in optoelectronics, thermoelectrics, and electrocatalysis...
March 16, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Parijat Sengupta, Saptarshi Das, Junxia Shi
We study a thermal gradient induced current Ith flow in potassium-doped two-dimensional anisotropic black phosphorus (BP) with semi-Dirac dispersion. The prototype device is a BP channel clamped between two contacts maintained at unequal temperatures. The choice of BP lies in the predicted efficient thermoelectric behaviour. A temperature-induced difference in the Fermi levels of the two contacts drives the current (typified by the electro-thermal conductance) which we calculate using the Landauer transport equation...
March 14, 2018: Journal of Chemical Physics
Jeremie Maire, Roman Anufriev, Takuma Hori, Junichiro Shiomi, Sebastian Volz, Masahiro Nomura
Semiconductor nanowires are potential building blocks for future thermoelectrics because of their low thermal conductivity. Recent theoretical works suggest that thermal conductivity of nanowires can be further reduced by additional constrictions, pillars or wings. Here, we experimentally study heat conduction in silicon nanowires with periodic wings, called fishbone nanowires. We find that like in pristine nanowires, the nanowire cross-section controls thermal conductivity of fishbone nanowires. However, the periodic wings further reduce the thermal conductivity...
March 13, 2018: Scientific Reports
Chan-Chieh Lin, Gareoung Kim, Dianta Ginting, Kyunghan Ahn, Jong Soo Rhyee
Topological insulators generally share commonalities with good thermoelectric materials because of their narrow band gaps and heavy constituent elements. Here we propose that a topological crystalline insulator (TCI) could exhibit a high thermoe-lectric performance by breaking its crystalline symmetry and tuning chemical potential by elemental doping. As a candidate material, we investigate thermoelectric properties of the Cl-doped topological crystalline insulator Pb0.7Sn0.3Se. The infrared absorption spectra reveal that the band gap is increased from 0...
March 13, 2018: ACS Applied Materials & Interfaces
David Portehault, Simon Delacroix, Guillaume Gouget, Rémi Grosjean, Tsou-Hsi-Camille Chan-Chang
The design of inorganic nanoparticles relies strongly on the knowledge from solid-state chemistry not only for characterization techniques, but also and primarily for choosing the systems that will yield the desired properties. The range of inorganic solids reported and studied as nanoparticles is however strikingly narrow when compared to the solid-state chemistry portfolio of bulk materials. Efforts to enlarge the collection of inorganic particles are becoming increasingly important for three reasons. First, they can yield materials more performing than current ones for a range of fields including biomedicine, optics, catalysis, and energy...
March 13, 2018: Accounts of Chemical Research
Zafar Said, Anis Allagui, Mohammad Ali Abdelkareem, Hussain Alawadhi, Khaled Elsaid
Carbon-based nanofluids are viewed as promising thermal fluids for heat transfer applications. However, other properties, such as electrical conductivity and electrochemical behavior, are usually overlooked and rarely investigated despite their importance for the overall performance characterization of a given application. In this study, we synthesized PAN-based carbon nanofibers (CNF) by electrospinning, and characterized them using electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy, and thermogravimetric analysis...
March 3, 2018: Journal of Colloid and Interface Science
Jeremy Robertson, Sid Becker
The exposure of the skin to low-frequency (20-100 kHz) ultrasound is a well-established method for increasing its permeability to drugs. The mechanism underlying this permeability increase has been found to be inertial cavitation within the coupling fluid. This study investigated the influence of acoustic reflections on the inertial cavitation dose during low-frequency (20 kHz) exposure in an in vitro skin sonoporation setup. This investigation was conducted using a passive cavitation detector that monitored the broadband noise emission within a modified Franz diffusion cell...
March 8, 2018: Ultrasound in Medicine & Biology
Hulei Yu, Abdul Rehman Shaikh, Fen Xiong, Yue Chen
Doping effects of various elements in the boron, carbon and pnictogen groups on the electronic structure and electrical transport properties of SnSe were studied from first principles. It is identified that Sb and Bi induce significant resonant states near the conduction band minimum, and increase the delocalization of charge density in the out-of-plane direction. Our Boltzmann transport calculations further demonstrate that these doping effects on the electronic structure are related to the simultaneously improved Seebeck coefficient and electrical conductivity...
March 9, 2018: ACS Applied Materials & Interfaces
Javier Burgués, Juan Manuel Jiménez-Soto, Santiago Marco
The limit of detection (LOD) is a key figure of merit in chemical sensing. However, the estimation of this figure of merit is hindered by the non-linear calibration curve characteristic of semiconductor gas sensor technologies such as, metal oxide (MOX), gasFETs or thermoelectric sensors. Additionally, chemical sensors suffer from cross-sensitivities and temporal stability problems. The application of the International Union of Pure and Applied Chemistry (IUPAC) recommendations for univariate LOD estimation in non-linear semiconductor gas sensors is not straightforward due to the strong statistical requirements of the IUPAC methodology (linearity, homoscedasticity, normality)...
July 12, 2018: Analytica Chimica Acta
Qingfeng Song, Pengfei Qiu, Hongyi Chen, Kunpeng Zhao, Dudi Ren, Xun Shi, Lidong Chen
Novel quaternary Cu2MnSnSe4 diamond-like thermoelectric materials were discovered recently based on the pseudocubic structure engineering. In this study, we show that introducing off-stoichiometry in Cu2MnSnSe4 effectively enhances its thermoelectric performance by simultaneously optimizing the carrier concentrations and suppressing lattice thermal conductivity. A series of non-stoichiometric Cu2+δMn1-δSnSe4 (δ = 0, 0.025, 0.05, 0.075, and 0.1) samples has been prepared by the melting-annealing method. The X-ray analysis and the scanning electron microscopy measurement show that all non-stoichiometric samples are phase pure...
March 2, 2018: ACS Applied Materials & Interfaces
Juan Li, Shuqi Zheng, Teng Fang, Luo Yue, Shuai Zhang, Guiwu Lu
N-type Mg3 Sb2 -based Zintl compounds are proved to be high-performance thermoelectric materials with multiple degenerate valleys and low lattice thermal conductivity. Here, we investigate the electronic band structure and the thermoelectric properties of n-type Mg3 Sb2 using first-principles density functional theory. A high ZT of 3.1 at 725 K is obtained when the minimum lattice thermal conductivity and the optimal carrier concentration are reached. The calculated thermoelectric performance demonstrates that Mg3 Sb2 possesses an isotropic character in thermoelectric transport...
March 2, 2018: Physical Chemistry Chemical Physics: PCCP
Bing Sun, Xiaopeng Jia, Jiaqiang Zhao, Yingde Li, Haiqiang Liu, Hongan Ma
The thermoelectric (TE) properties of n-type polycrystalline Yb0.5 Ba7.5 Ga16 Ge30 bulks can be optimized by high-pressure and high-temperature (HPHT) sintering. After HPHT sintering, abundant nanograins are randomly distributed in the sample. Grains are refined by HPHT, with the grains being smaller with higher pressure. In comparison with the arc-melted sample, the samples obtained by quenching under high pressure possess a great number of nanograins and lattice structural disorders. Lower thermal conductivity is benefited by our deliberately engineered microstructures via HPHT, and the minimum thermal conductivity is 0...
March 1, 2018: Inorganic Chemistry
Subhajit Roychowdhury, Manoj K Jana, Jaysree Pan, Satya N Guin, Dirtha Sanyal, Umesh V Waghmare, Kanishka Biswas
Crystalline solids exhibiting intrinsically low lattice thermal conductivity (κL) are crucial to realizing high-performance thermoelectric (TE) materials. Herein, we demonstrate an ultralow κL of 0.35 Wm-1K-1 in AgCuTe, which exhibits a remarkable TE figure-of-merit, zT of 1.6 at 670 K when alloyed with 10 mol% Se. First-principles DFT calculation reveals the presence of several soft phonon modes in its room-temperature hexagonal phase, which are also evident from low-temperature heat capacity measurement...
February 28, 2018: Angewandte Chemie
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