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https://www.readbyqxmd.com/read/28544254/side-chain-effects-on-the-thermoelectric-properties-of-fluorene-based-copolymers
#1
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
#2
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...
May 23, 2017: Nanoscale
https://www.readbyqxmd.com/read/28466635/thermoelectric-properties-of-highly-conductive-poly-3-4-ethylenedioxythiophene-polystyrene-sulfonate-printed-thin-films
#3
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 by means of 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 towards further development of the field. This contribution 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 3, 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
#4
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
#5
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...
April 24, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28398431/high-performance-thermoelectricity-in-edge-over-edge-zinc-porphyrin-molecular-wires
#6
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
#7
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
#8
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
https://www.readbyqxmd.com/read/28272862/a-novel-n-type-organosilane-metal-ion-hybrid-of-rhodamine-b-and-copper-cation-for-low-temperature-thermoelectric-materials
#9
John R Bertram, Aubrey Penn, Matthew J Nee, Hemali Rathnayake
An n-type organosilane-metal ion hybrid of Rhodamine B-silane and copper cation (Cu-RBS) was investigated as a low-temperature thermoelectric material. Computational analysis revealed the most likely localized binding site of Cu(2+) was to the Rhodamine B core and provided predictions of molecular orbitals and electrostatic potentials upon complexation. The concentration-dependent optical absorption and emission spectra confirmed the effective metal-ligand charge transfer from Cu(2+) to the xanthene core of RBS, indicating the potential for improved electrical properties for the complex relative to RBS...
March 29, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28248087/thermoelectric-enhancement-by-compositing-carbon-nanotubes-into-iodine-doped-poly-2-methoxy-5-2-ethylhexyloxy-1-4-phenylenevinylene
#10
Murat Tonga, Lang Wei, Patrick S Taylor, Eugene Wilusz, Ljiljana Korugic-Karasz, Frank E Karasz, Paul M Lahti
Free-standing iodine-doped composite samples of poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) with carbon nanotubes (NTs) showed thermoelectric (TE) power factors (PFs) up to 33 μW·m(-1)·K(-2) after optimizing multiple factors, including: (1) sample fabrication solvent, (2) doping time, (3) average MEH-PPV molecular weight, (4) NT fraction in the composite, and (5) use of single-wall versus multi-wall nanotubes (SWNT and MWNT, respectively). Composite fabrication from halogenated solvents gave the best TE performance after iodine doping times of 2-4 h; performance drops substantially in ∼20 h doped samples...
March 1, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28195424/low-cost-and-sustainable-organic-thermoelectrics-based-on-low-dimensional-molecular-metals
#11
Florian Huewe, Alexander Steeger, Kalina Kostova, Laurence Burroughs, Irene Bauer, Peter Strohriegl, Vladimir Dimitrov, Simon Woodward, Jens Pflaum
Thermoelectric generator composed of crystalline radical ion salts: The unipolar charge transport along the molecular stacks facilitates complementary p- and n-type organic thermoelectric materials of high electrical conductivity and of 1D electronic structure. The specific power output of 5 mW cm(-2) and the zT > 0.15 below 40 K demonstrate a new field of low-temperature thermoelectric applications unlocked by organic metals.
April 2017: Advanced Materials
https://www.readbyqxmd.com/read/28192662/fluorene-based-two-dimensional-covalent-organic-framework-with-thermoelectric-properties-through-doping
#12
Liangying Wang, Bin Dong, Rile Ge, Fengxing Jiang, Jingkun Xu
Organic semiconductors have great potential as flexible thermoelectric materials. A fluorene-based covalent organic framework (FL-COF-1) was designed with the aim of creating an enhanced π-π interaction among the crystalline backbones. By the introduction of fluorene units into the frameworks, the FL-COF-1 had high thermal stability with a BET surface area over 1300 m(2) g(-1). The open frameworks were favorable for doping with iodine and followed with the improved charge carrier mobility. The compressed pellet of I2@FL-COF-1 exhibited a high Seebeck coefficient of 2450 μV K(-1) and power factor of 0...
March 1, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28147642/thermoelectric-characterization-of-flexible-micro-thermoelectric-generators
#13
D Beretta, M Massetti, G Lanzani, M Caironi
A new experimental setup for the characterization of flexible micro-thermoelectric generators is reported. The system can measure the power generated and the thermoelectric conversion efficiency of devices under mechanical stresses and deformations, in atmospheric environment and under vacuum, in the temperature interval 293 K-423 K, as a function of the load resistance and of the mechanical pressure, with an uncertainty on the temperature difference of ±0.02 K. The system has been tested on commercial rigid devices and on a custom-made, flexible, proof-of-concept, organic-inorganic hybrid generator made of eight thermocouples...
January 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28139738/ionic-thermoelectric-gating-organic-transistors
#14
Dan Zhao, Simone Fabiano, Magnus Berggren, Xavier Crispin
Temperature is one of the most important environmental stimuli to record and amplify. While traditional thermoelectric materials are attractive for temperature/heat flow sensing applications, their sensitivity is limited by their low Seebeck coefficient (∼100 μV K(-1)). Here we take advantage of the large ionic thermoelectric Seebeck coefficient found in polymer electrolytes (∼10,000 μV K(-1)) to introduce the concept of ionic thermoelectric gating a low-voltage organic transistor. The temperature sensing amplification of such ionic thermoelectric-gated devices is thousands of times superior to that of a single thermoelectric leg in traditional thermopiles...
January 31, 2017: Nature Communications
https://www.readbyqxmd.com/read/28128932/high-thermoelectric-power-factor-organic-thin-films-through-combination-of-nanotube-multilayer-assembly-and-electrochemical-polymerization
#15
Mario Culebras, Chungyeon Cho, Michelle Krecker, Ryan Smith, Yixuan Song, Clara M Gómez, Andrés Cantarero, Jaime C Grunlan
In an effort to produce effective thermoelectric nanocomposites with multiwalled carbon nanotubes (MWCNT), layer-by-layer assembly was combined with electrochemical polymerization to create synergy that would produce a high power factor. Nanolayers of MWCNT stabilized with poly(diallyldimethylammonium chloride) or sodium deoxycholate were alternately deposited from water. Poly(3,4-ethylene dioxythiophene) [PEDOT] was then synthesized electrochemically by using this MWCNT-based multilayer thin film as the working electrode...
February 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28092765/cytotoxic-genotoxic-and-mutagenic-evaluation-of-surface-waters-from-a-coal-exploration-region
#16
Cynthia Silva Porta, Débora Lemes Dos Santos, Hélio Vieira Bernardes, Bruno Corrêa Bellagamba, Anaí Duarte, Johnny Ferraz Dias, Fernanda Rabaioli da Silva, Mauricio Lehmann, Juliana da Silva, Rafael Rodrigues Dihl
Coal mining generates a considerable amount of waste, which is disposed of in piles or dams near mining sites. As a result, leachates may reach rivers and streams, promoting the wide dispersion of contaminants in solution and as particulate matter. The present study evaluated the cytotoxic, genotoxic, and mutagenic action of surface waters collected around a thermoelectric power plant and the largest mining area in Brazil (Candiota). Four sites in Candiota stream were selected, and samples were collected in winter and summer...
April 2017: Chemosphere
https://www.readbyqxmd.com/read/28029230/water-processable-air-stable-organic-nanoparticle-carbon-nanotube-nanocomposites-exhibiting-n-type-thermoelectric-properties
#17
Yoshiyuki Nonoguchi, Atsushi Tani, Tomohiro Ikeda, Chigusa Goto, Naoki Tanifuji, Ryoko M Uda, Tsuyoshi Kawai
Water-dispersed organic base nanoparticles are utilized for the highly stable n-type doping of single-walled carbon nanotubes in aqueous dispersion. Long-term stability is often a critical challenge in the application of n-type organic conductors. The present n-type organic materials exhibit almost no degradation in the thermoelectric properties over the months, in air.
December 28, 2016: Small
https://www.readbyqxmd.com/read/27893437/silicon-nanowire-heterostructures-for-advanced-energy-and-environmental-applications-a-review
#18
Ramesh Ghosh, P K Giri
Semiconductor nanowires (NWs), in particular Si NWs, have attracted much attention in the last decade for their unique electronic properties and potential applications in several emerging areas. With the introduction of heterostructures (HSs) on NWs, new functionalities are obtained and the device performance is improved significantly in many cases. Due to the easy fabrication techniques, excellent optoelectronic properties and compatibility of forming HSs with different inorganic/organic materials, Si NW HSs have been utilized in various configurations and device architectures...
January 6, 2017: Nanotechnology
https://www.readbyqxmd.com/read/27879037/nanomembrane-based-thermal-transport-biosensor-for-living-cells
#19
Rami T ElAfandy, Ayman F AbuElela, Pawan Mishra, Bilal Janjua, Hassan M Oubei, Ulrich Büttner, Mohammed A Majid, Tien Khee Ng, Jasmeen S Merzaban, Boon S Ooi
Knowledge of materials' thermal-transport properties, conductivity and diffusivity, is crucial for several applications within areas of biology, material science and engineering. Specifically, a microsized, flexible, biologically integrated thermal transport sensor is beneficial to a plethora of applications, ranging across plants physiological ecology and thermal imaging and treatment of cancerous cells, to thermal dissipation in flexible semiconductors and thermoelectrics. Living cells pose extra challenges, due to their small volumes and irregular curvilinear shapes...
November 23, 2016: Small
https://www.readbyqxmd.com/read/27775860/crystalline-highly-oriented-mof-thin-film-the-fabrication-and-application
#20
REVIEW
Zhihua Fu, Gang Xu
The thin film of metal-organic frameworks (MOFs) is a rapidly developing research area which has tremendous potential applications in many fields. One of the major challenges in this area is to fabricate MOF thin film with good crystallinity, high orientation and well-controlled thickness. In order to address this challenge, different appealing approaches have been studied intensively. Among various oriented MOF films, many efforts have also been devoted to developing novel properties and broad applications, such as in gas separator, thermoelectric, storage medium and photovoltaics...
October 24, 2016: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
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