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https://www.readbyqxmd.com/read/28913423/opto-thermophoretic-assembly-of-colloidal-matter
#1
Linhan Lin, Jianli Zhang, Xiaolei Peng, Zilong Wu, Anna C H Coughlan, Zhangming Mao, Michael A Bevan, Yuebing Zheng
Colloidal matter exhibits unique collective behaviors beyond what occurs at single-nanoparticle and atomic scales. Treating colloidal particles as building blocks, researchers are exploiting new strategies to rationally organize colloidal particles into complex structures for new functions and devices. Despite tremendous progress in directed assembly and self-assembly, a truly versatile assembly technique without specific functionalization of the colloidal particles remains elusive. We develop a new strategy to assemble colloidal matter under a light-controlled temperature field, which can solve challenges in the existing assembly techniques...
September 2017: Science Advances
https://www.readbyqxmd.com/read/28892387/functionalized-poly-3-4-ethylenedioxy-bithiophene-films-for-tuning-electrochromic-and-thermoelectric-properties
#2
Yongjing Hu, Xiaofang Liu, Fengxing Jiang, Weiqiang Zhou, Congcong Liu, Xuemin Duan, Jingkun Xu
Conductive thiophene-base polymers have gained great concern in the organic electron materials such as electrochromic and thermoelectric materials. However, they suffer from poor electron transport property and long-term stability leading to the limited development eventually. Here, we proposed a strategy of functionalized thiophene-based polymers with oligo(ethylene glycol) or alkyl side chains and synthesized a series of poly(3,4-ethylenedioxy bithiophene)s (PEDTs) to tune their electrochromic and thermoelectric properties...
September 11, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28820584/conjugated-backbone-effect-of-organic-small-molecules-for-n-type-thermoelectric-materials-with-zt-over-0-2
#3
Dazhen Huang, Huiying Yao, Yutao Cui, Ye Zou, Fengjiao Zhang, Chao Wang, Hongguang Shen, Wenlong Jin, Jia Zhu, Ying Diao, Wei Xu, Chong-An Di, Daoben Zhu
Conjugated backbones play a fundamental role in determining the electronic properties of organic semiconductors. On the basis of two solution-processable dihydropyrrolo[3,4-c]pyrrole-1,4-diylidenebis(thieno[3,2-b]thiophene) derivatives with aromatic and quinoid structures, we have carried out a systematic study of the relationship between the conjugated-backbone structure and the thermoelectric properties. In particular, a combination of UV-vis-NIR spectra, photoemission spectroscopy, and doping optimization are utilized to probe the interplay between energy levels, chemical doping, and thermoelectric performance...
September 6, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28800218/efficient-solution-processed-n-type-small-molecule-thermoelectric-materials-achieved-by-precisely-regulating-energy-level-of-organic-dopants
#4
Dafei Yuan, Dazhen Huang, Cheng Zhang, Ye Zou, Chong-An Di, Xiaozhang Zhu, Daoben Zhu
To achieve efficient n-type doping, three dopants, 2-Cyc-DMBI-H, (2-Cyc-DMBI)2, and (2-Cyc-DMBI-Me)2, with precisely regulated electron-donating ability were designed and synthesized. By doping with a small-molecule 2DQTT-o-OD with high electron mobility, an unexpectedly high power factor of 33.3 μW m(-1) K(-2) was obtained with the new dopant (2-Cyc-DMBI-Me)2. Notably, with the intrinsically low lateral thermal conductivity of 0.28 W m(-1) K(-1), the figure of merit was determined to be 0.02 at room temperature...
August 30, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28773182/thermostability-of-hybrid-thermoelectric-materials-consisting-of-poly-ni-ethenetetrathiolate-polyimide-and-carbon-nanotubes
#5
Keisuke Oshima, Shifumi Sadakata, Hitoshi Asano, Yukihide Shiraishi, Naoki Toshima
Three-component organic/inorganic hybrid films were fabricated by drop-casting the mixed dispersion of nanodispersed-poly(nickel 1,1,2,2-ethenetetrathiolate) (nano-PETT), polyimide (PI) and super growth carbon nanotubes (SG-CNTs) in N-methylpyrrolidone (NMP) at the designed ratio on a substrate. The dried nano-PETT/PI/SG-CNT hybrid films were prepared by the stepwise cleaning of NMP and methanol, and were dried once more. The thermoelectric properties of Seebeck coefficient S and electrical conductivity σ were measured by a thin-film thermoelectric measurement system ADVANCE RIKO ZEM-3M8 at 330-380 K...
July 18, 2017: Materials
https://www.readbyqxmd.com/read/28737034/modification-of-the-poly-bisdodecylquaterthiophene-structure-for-high-and-predominantly-nonionic-conductivity-with-matched-dopants
#6
Hui Li, Mallory E DeCoster, Robert M Ireland, Jian Song, Patrick E Hopkins, Howard E Katz
Four p-type polymers were synthesized by modifying poly(bisdodecylquaterthiophene) (PQT12) to increase oxidizability by p-dopants. A sulfur atom is inserted between the thiophene rings and dodecyl chains, and/or 3,4-ethylenedioxy groups are appended to thiophene rings of PQT12. Doped with NOBF4, PQTS12 (with sulfur in side chains) shows a conductivity of 350 S cm(-1), the highest reported nonionic conductivity among films made from dopant-polymer solutions. Doped with tetrafluorotetracyanoquinodimethane (F4TCNQ), PDTDE12 (with 3,4-ethylenedioxy groups on thiophene rings) shows a conductivity of 140 S cm(-1)...
August 16, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28722288/n-type-organic-thermoelectrics-improved-power-factor-by-tailoring-host-dopant-miscibility
#7
Jian Liu, Li Qiu, Giuseppe Portale, Marten Koopmans, Gert Ten Brink, Jan C Hummelen, L Jan Anton Koster
In this contribution, for the first time, the polarity of fullerene derivatives is tailored to enhance the miscibility between the host and dopant molecules. A fullerene derivative with a hydrophilic triethylene glycol type side chain (PTEG-1) is used as the host and (4-(1,3-dimethyl-2,3-dihydro-1H-benzoimidazol-2-yl)phenyl)dimethylamine n-DMBI) as the dopant. Thereby, the doping efficiency can be greatly improved to around 18% (<1% for a nonpolar reference sample) with optimized electrical conductivity of 2...
July 19, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28718471/two-dimensional-metal-organic-frameworks-with-high-thermoelectric-efficiency-through-metal-ion-selection
#8
Yuping He, Catalin D Spataru, Francois Léonard, Reese E Jones, Michael E Foster, Mark D Allendorf, A Alec Talin
Two-dimensional (2D) materials have attracted much attention due to their novel properties. An exciting new class of 2D materials based on metal-organic frameworks (MOFs) has recently emerged, displaying high electrical conductivity, a rarity among organic nanoporous materials. The emergence of these materials raises intriguing questions about their fundamental electronic, optical, and thermal properties, but few studies exist in this regard. Here we present an atomistic study of the thermoelectric properties of crystalline 2D MOFs X3(HITP)2 with X = Ni, Pd or Pt, and HITP = 2,3,6,7,10,11-hexaiminotriphenylene, using both ab initio transport models and classical molecular dynamics simulations...
July 26, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28707300/high-conductivity-and-electron-transfer-validation-in-an-n-type-fluoride-anion-doped-polymer-for-thermoelectrics-in-air
#9
Xingang Zhao, Deepa Madan, Yan Cheng, Jiawang Zhou, Hui Li, Susanna M Thon, Arthur E Bragg, Mallory E DeCoster, Patrick E Hopkins, Howard E Katz
Air-stable and soluble tetrabutylammonium fluoride (TBAF) is demonstrated as an efficient n-type dopant for the conjugated polymer ClBDPPV. Electron transfer from F(-) anions to the π-electron-deficient ClBDPPV through anion-π electronic interactions is strongly corroborated by the combined results of electron spin resonance, UV-vis-NIR, and ultraviolet photoelectron spectroscopy. Doping of ClBDPPV with 25 mol% TBAF boosts electrical conductivity to up to 0.62 S cm(-1) , among the highest conductivities that have been reported for solution-processed n-type conjugated polymers, with a thermoelectric power factor of 0...
September 2017: Advanced Materials
https://www.readbyqxmd.com/read/28590486/correction-a-review-of-carrier-thermoelectric-transport-theory-in-organic-semiconductors
#10
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
https://www.readbyqxmd.com/read/28573853/carbon-nanoparticle-hybrid-aerogels-3d-double-interconnected-network-porous-microstructure-thermoelectric-and-solvent-removal-functions
#11
Dongxing Tan, Jian Zhao, Caiyan Gao, Hanfu Wang, Guangming Chen, Donglu Shi
We report reduced graphene oxide (rGO)/single-walled carbon nanotube (SWCNT) hybrid aerogels with enhanced thermoelectric (TE) performance and removal of organic solvents by designing 3D double-interconnected network porous microstructures. A convenient, cost-effective, and scalable preparation procedure is proposed compared with conventional high-temperature pyrolysis and supercritical drying techniques. The obtained hybrid aerogels are systematically characterized by apparent density, scanning electron microscopy, X-ray photoemission spectroscopy, Raman spectroscopy, and porosity...
June 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28548168/tuning-the-seebeck-effect-in-c60-based-hybrid-thermoelectric-devices-through-temperature-dependent-surface-polarization-and-thermally-modulated-interface-dipoles
#12
Yuchun Liu, Ling Xu, Chen Zhao, Ming Shao, Bin Hu
Fullerene (C60) is an important n-type organic semiconductor with high electron mobility and low thermal conductivity. In this work, we report the experimental results on the tunable Seebeck effect of C60 hybrid thin-film devices by adopting different oxide layers. After inserting n-type high-dielectric constant titanium oxide (TiOx) and zinc oxide (ZnO) layers, we observed a significantly enhanced n-type Seebeck effect in oxide/C60 hybrid devices with Seebeck coefficients of -5.8 mV K(-1) for TiOx/C60 and -2...
June 7, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28544254/side-chain-effects-on-the-thermoelectric-properties-of-fluorene-based-copolymers
#13
Ansheng Liang, Xiaoyan Zhou, Wenqiao Zhou, Tao Wan, Luhai Wang, Chengjun Pan, Lei Wang
Three conjugated polymers with alkyl chains of different lengths are designed and synthesized, and their structure-property relationship as organic thermoelectric materials is systematically elucidated. All three polymers show similar photophysical properties, thermal properties, and mechanical properties; however, their thermoelectric performance is influenced by the length of their side chains. The length of the alkyl chain significantly influences the electrical conductivity of the conjugated polymers, and polymers with a short alkyl chain exhibit better conductivity than those with a long alkyl chain...
May 24, 2017: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/28534909/engineering-band-gap-and-electronic-transport-in-organic-inorganic-halide-perovskites-by-superlattices
#14
Rahul Singh, Ranjith Kottokkaran, Vikram L Dalal, Ganesh Balasubramanian
Organic/inorganic lead and tin halide perovskites (CH3NH3PbI3 and CH3NH3SnI3) have been promising for photovoltaics because of their high charge carrier mobility, and large absorption coefficient and diffusion length. Both these perovskites also have a notable Seebeck coefficient, depending on the doping level, indicating their potential as thermoelectrics. We create superlattices of these hybrid organic-inorganic halide perovskites and investigate electronic transport through them using first principles computations and experiments...
June 29, 2017: Nanoscale
https://www.readbyqxmd.com/read/28466635/thermoelectric-properties-of-highly-conductive-poly-3-4-ethylenedioxythiophene-polystyrene-sulfonate-printed-thin-films
#15
Davide Beretta, Alex J Barker, Isis Maqueira-Albo, Alberto Calloni, Gianlorenzo Bussetti, Giorgio Dell'Erba, Alessandro Luzio, Lamberto Duò, Annamaria Petrozza, Guglielmo Lanzani, Mario Caironi
Organic conductors are being evaluated for potential use in waste heat recovery through lightweight and flexible thermoelectric generators manufactured using cost-effective printing processes. Assessment of the potentiality of organic materials in real devices still requires a deeper understanding of the physics behind their thermoelectric properties, which can pave the way toward further development of the field. This article reports a detailed thermoelectric study of a set of highly conducting inkjet-printed films of commercially available poly(3,4-ethylenedioxythiophene) polystyrene sulfonate formulations characterized by in-plane electrical conductivity, spanning the interval 10-500 S/cm...
May 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28453012/ab-initio-assessment-of-bi1-xrexcuos-re-la-gd-y-lu-solid-solutions-as-a-semiconductor-for-photochemical-water-splitting
#16
Sheikha Lardhi, Antton Curutchet, Luigi Cavallo, Moussab Harb, Tangui Le Bahers
The investigation of the BiCuOCh (Ch = S, Se and Te) semiconductor family for thermoelectric or photovoltaic materials is a topic of increasing research interest. These materials can also be considered for photochemical water splitting if one representative having a bandgap, Eg, at around 2 eV can be developed. With this aim, we simulated the solid solutions Bi1-xRExCuOS (RE = Y, La, Gd and Lu) from pure BiCuOS (Eg ∼ 1.1 eV) to pure RECuOS compositions (Eg ∼ 2.9 eV) by DFT calculations based on the HSE06 range-separated hybrid functional with the inclusion of spin-orbit coupling...
May 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28437018/polar-side-chains-enhance-processability-electrical-conductivity-and-thermal-stability-of-a-molecularly-p-doped-polythiophene
#17
Renee Kroon, David Kiefer, Dominik Stegerer, Liyang Yu, Michael Sommer, Christian Müller
Molecular doping of organic semiconductors is critical for optimizing a range of optoelectronic devices such as field-effect transistors, solar cells, and thermoelectric generators. However, many dopant:polymer pairs suffer from poor solubility in common organic solvents, which leads to a suboptimal solid-state nanostructure and hence low electrical conductivity. A further drawback is the poor thermal stability through sublimation of the dopant. The use of oligo ethylene glycol side chains is demonstrated to significantly improve the processability of the conjugated polymer p(g4 2T-T)-a polythiophene-in polar aprotic solvents, which facilitates coprocessing of dopant:polymer pairs from the same solution at room temperature...
June 2017: Advanced Materials
https://www.readbyqxmd.com/read/28398431/high-performance-thermoelectricity-in-edge-over-edge-zinc-porphyrin-molecular-wires
#18
Mohammed Noori, Hatef Sadeghi, Colin J Lambert
If high efficiency organic thermoelectric materials could be identified, then these would open the way to a range of energy harvesting technologies and Peltier coolers using flexible and transparent thin-film materials. We have compared the thermoelectric properties of three zinc porphyrin (ZnP) dimers and a ZnP monomer and found that the "edge-over-edge" dimer formed from stacked ZnP rings possesses a high electrical conductance, negligible phonon thermal conductance and a high Seebeck coefficient of the order of 300 μV K(-1)...
April 20, 2017: Nanoscale
https://www.readbyqxmd.com/read/28316244/electronic-properties-of-bimetallic-metal-organic-frameworks-mofs-tailoring-density-of-electronic-states-through-mof-modularity
#19
Ekaterina A Dolgopolova, Amy J Brandt, Otega Ejegbavwo, Audrey S Duke, Thathsara D Maddumapatabandi, Randima P Galhenage, Bryon W Larson, Obadiah Reid, Salai Cheettu Ammal, Andreas Heyden, Mvs Chandrashekhar, Vitalie Stavila, Donna A Chen, Natalia B Shustova
Development of porous well-defined hybrid materials (e.g., metal-organic frameworks (MOFs)) will add a new dimension to a wide number of applications ranging from supercapacitors and electrodes to "smart" membranes and thermoelectrics. From this perspective, understanding and tailoring electronic properties of MOFs is a key fundamental challenge that could unlock the full potential of these materials. In this work, we focused on the fundamental insights responsible for the electronic properties of three distinct classes of bimetallic systems, Mx-yM'y-MOFs, MxM'y-MOFs, and Mx(ligand-M'y)-MOFs, in which the second metal (M') incorporation occurs through: (i) metal (M) replacement in the framework nodes (type I), (ii) metal node extension (type II), and (iii) metal coordination to the organic ligand (type III), respectively...
March 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28293952/higher-pedot-molecular-weight-giving-rise-to-higher-thermoelectric-property-of-pedot-pss-a-comparative-study-of-clevios-p-and-clevios-ph1000
#20
Zeng Fan, Donghe Du, Hongyan Yao, Jianyong Ouyang
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is a promising candidate as the next-generation thermoelectric (TE) material. Its TE properties are strongly dependent on its chemical and electronic structures. In this paper, we investigated the effect of PEDOT molecular weight on the TE properties of PEDOT:PSS films by a comparative study on two commercial grades of PEDOT:PSS, Clevios P, and Clevios PH1000. Dynamic light scattering (DLS) and Raman spectra imply that the PEDOT of Clevios PH1000 possesses longer conjugated chains than that of Clevios P...
March 22, 2017: ACS Applied Materials & Interfaces
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