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https://www.readbyqxmd.com/read/29780515/topotactic-anion-exchange-in-thermoelectric-nanostructured-layered-tin-chalcogenides-with-reduced-selenium-content
#1
Guang Han, Srinivas R Popuri, Heather F Greer, Ruizhi Zhang, Lourdes Ferre-Llin, Jan-Willem G Bos, Wuzong Zhou, Michael J Reece, Douglas J Paul, Andrew R Knox, Duncan H Gregory
Anion exchange has been performed with nanoplates of tin sulfide (SnS) via "soft chemical" organic-free solution syntheses to yield layered pseudo-ternary tin chalcogenides on a 10 g-scale. SnS undergoes a topotactic transformation to form a series of S-substituted tin selenide (SnSe) nano/micro-plates with tuneable chalcogenide composition. SnS0.1 Se0.9 nanoplates were spark plasma sintered into phase-pure, textured, dense pellets, the ZT of which has been significantly enhanced to ≈1.16 from ≈0...
April 21, 2018: Chemical Science
https://www.readbyqxmd.com/read/29775276/fully-printed-organic-inorganic-nanocomposites-for-flexible-thermoelectric-applications
#2
Canlin Ou, Abhijeet Laxman Sangle, Anuja Datta, Qingshen Jing, Tommaso Busolo, Thomas Chalklen, Vijay Narayan, Sohini Kar-Narayan
Thermoelectric materials, capable of interconverting heat and electricity, are attractive for applications in thermal energy harvesting as a means to power wireless sensors, wearable devices and portable electronics. However, traditional inorganic thermoelectric materials pose significant challenges due to high cost, toxicity, scarcity, as well as brittleness particularly when it comes to applications requiring flexibility. Here, we investigate organic-inorganic nanocomposites that have been developed from bespoke inks which are printed via an aerosol jet printing method onto flexible substrates...
May 18, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29757342/deconstructing-collagen-piezoelectricity-using-alanine-hydroxyproline-glycine-building-blocks
#3
Sarah Guerin, Tofail A M Syed, Damien Thompson
Collagen piezoelectricity has been the focus of a large number of experimental and theoretical studies for over fifty years. Less is known about the piezoelectric properties of its building blocks, in particular but not limited to, proline and hydroxyproline. Spurred by the recent upsurge of interest in piezoelectricity in organic crystals including our own report of unprecedentedly high piezoelectricity in amino acid glycine, we predict and measure the piezoelectric properties of collagen subcomponents in single crystalline forms and the collagen-like alanine-hydroxyproline-glycine trimer peptide...
May 14, 2018: Nanoscale
https://www.readbyqxmd.com/read/29584634/printing-and-folding-a-solution-for-high-throughput-processing-of-organic-thin-film-thermoelectric-devices
#4
Seyedmohammad Mortazavinatanzi, Alireza Rezaniakolaei, Lasse Rosendahl
Wearable electronics are rapidly expanding, especially in applications like health monitoring through medical sensors and body area networks (BANs). Thermoelectric generators (TEGs) have been the main candidate among the different types of energy harvesting methods for body-mounted or even implantable sensors. Introducing new semiconductor materials like organic thermoelectric materials and advancing manufacturing techniques are paving the way to overcome the barriers associated with the bulky and inflexible nature of the common TEGs and are making it possible to fabricate flexible and biocompatible modules...
March 27, 2018: Sensors
https://www.readbyqxmd.com/read/29579403/stable-radical-materials-for-energy-applications
#5
Daniel A Wilcox, Varad Agarkar, Sanjoy Mukherjee, Bryan W Boudouris
Although less studied than their closed-shell counterparts, materials containing stable open-shell chemistries have played a key role in many energy storage and energy conversion devices. In particular, the oxidation-reduction (redox) properties of these stable radicals have made them a substantial contributor to the progress of organic batteries. Moreover, the use of radical-based materials in photovoltaic devices and thermoelectric systems has allowed for these emerging molecules to have impacts in the energy conversion realm...
March 26, 2018: Annual Review of Chemical and Biomolecular Engineering
https://www.readbyqxmd.com/read/29565069/high-performance-thermoelectric-materials-based-on-ternary-tio-2-cnt-pani-composites
#6
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
https://www.readbyqxmd.com/read/29457139/enhanced-n-doping-efficiency-of-a-naphthalenediimide-based-copolymer-through-polar-side-chains-for-organic-thermoelectrics
#7
David Kiefer, Alexander Giovannitti, Hengda Sun, Till Biskup, Anna Hofmann, Marten Koopmans, Camila Cendra, Stefan Weber, L Jan Anton Koster, Eva Olsson, Jonathan Rivnay, Simone Fabiano, Iain McCulloch, Christian Müller
N-doping of conjugated polymers either requires a high dopant fraction or yields a low electrical conductivity because of their poor compatibility with molecular dopants. We explore n-doping of the polar naphthalenediimide-bithiophene copolymer p(gNDI-gT2) that carries oligoethylene glycol-based side chains and show that the polymer displays superior miscibility with the benzimidazole-dimethylbenzenamine-based n-dopant N-DMBI. The good compatibility of p(gNDI-gT2) and N-DMBI results in a relatively high doping efficiency of 13% for n-dopants, which leads to a high electrical conductivity of more than 10-1 S cm-1 for a dopant concentration of only 10 mol % when measured in an inert atmosphere...
February 9, 2018: ACS Energy Letters
https://www.readbyqxmd.com/read/29424080/in-situ-oxidation-synthesis-of-p-type-composite-with-narrow-bandgap-small-organic-molecule-coating-on-single-walled-carbon-nanotube-flexible-film-and-thermoelectric-performance
#8
Caiyan Gao, Guangming Chen
Although composites of organic polymers or n-type small molecule/carbon nanotube (CNT) have achieved significant advances in thermoelectric (TE) applications, p-type TE composites of small organic molecules as thick surface coating layers on the surfaces of inorganic nanoparticles still remain a great challenge. Taking advantage of in situ oxidation reaction of thieno[3,4-b]pyrazine (TP) into TP di-N-oxide (TPNO) on single-walled CNT (SWCNT) surface, a novel synthesis strategy is proposed to achieve flexible films of TE composites with narrow-bandgap (1...
March 2018: Small
https://www.readbyqxmd.com/read/29400436/copper-phenylacetylide-nanobelt-single-walled-carbon-nanotube-composites-mechanochromic-luminescence-phenomenon-and-thermoelectric-performance
#9
Ni Feng, Caiyan Gao, Cun-Yue Guo, Guangming Chen
We report flexible films of organic-inorganic thermoelectric (TE) composites based on organometallic coordination compound [copper-phenylacetylide (PhC2 Cu)] nanobelts and single-walled carbon nanotubes (SWCNTs). Interestingly, an unusual mechanochromic luminescence phenomenon from bright green to dark red is clearly observed after grinding the PhC2 Cu crystalline nanobelts. The PhC2 Cu/SWCNT composites display high mechanical flexibility and excellent TE performance. The maximum power factor at room temperature can reach as high as 200...
February 14, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29388641/conflicting-effect-of-chemical-doping-on-the-thermoelectric-response-of-ordered-pedot-aggregates
#10
Luigi Cigarini, Alice Ruini, Alessandra Catellani, Arrigo Calzolari
Poly(3,4-ethylenedioxythiophene) (PEDOT) semiconductor plays a relevant role in the development of organic thermoelectric (TE) devices for low-power generation. While dopant counterions are usually needed to provide electrical conductivity, their overall effects on the thermoelectric response of the systems are unknown and uncontrolled. Here, we present a first principles study of the electronic and thermal transport of PEDOT crystalline assemblies, specifically analysing the role played by tosylate dopants on the thermoelectric figure of merit of the doped system...
February 14, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29356158/carbon-nanotube-based-thermoelectric-materials-and-devices
#11
REVIEW
Jeffrey L Blackburn, Andrew J Ferguson, Chungyeon Cho, Jaime C Grunlan
Conversion of waste heat to voltage has the potential to significantly reduce the carbon footprint of a number of critical energy sectors, such as the transportation and electricity-generation sectors, and manufacturing processes. Thermal energy is also an abundant low-flux source that can be harnessed to power portable/wearable electronic devices and critical components in remote off-grid locations. As such, a number of different inorganic and organic materials are being explored for their potential in thermoelectric-energy-harvesting devices...
March 2018: Advanced Materials
https://www.readbyqxmd.com/read/29289178/lithography-free-resistance-thermometry-based-technique-to-accurately-measure-seebeck-coefficient-and-electrical-conductivity-for-organic-and-inorganic-thin-films
#12
Pawan Kumar, D V Maheswar Repaka, Kedar Hippalgaonkar
We have developed a new and accurate technique to measure temperature dependent in-plane Seebeck coefficient and electrical conductivity of organic and inorganic thin films. The measurement device consists of one heater, two thermometers, and a four-probe configuration which is patterned on a substrate of choice using a simple shadow mask. The high resolution in temperature measurements and repeatability of resistance thermometry is leveraged while enabling simple implementation using only a shadow mask for patterning...
December 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/29240395/narrow-band-gap-conjugated-polyelectrolytes
#13
Qiuhong Cui, Guillermo C Bazan
Two essential structural elements define a class of materials called conjugated polyelectrolytes (CPEs). The first is a polymer framework with an electronically delocalized, π-conjugated structure. This component allows one to adjust desirable optical and electronic properties, for example the range of wavelengths absorbed, emission quantum yields, electron affinity, and ionization potential. The second defining feature is the presence of ionic functionalities, which are usually linked via tethers that can modulate the distance of the charged groups relative to the backbone...
January 16, 2018: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29044102/ultrahigh-thermoelectric-power-factor-in-flexible-hybrid-inorganic-organic-superlattice
#14
Chunlei Wan, Ruoming Tian, Mami Kondou, Ronggui Yang, Pengan Zong, Kunihito Koumoto
Hybrid inorganic-organic superlattice with an electron-transmitting but phonon-blocking structure has emerged as a promising flexible thin film thermoelectric material. However, the substantial challenge in optimizing carrier concentration without disrupting the superlattice structure prevents further improvement of the thermoelectric performance. Here we demonstrate a strategy for carrier optimization in a hybrid inorganic-organic superlattice of TiS2 [tetrabutylammonium]x [hexylammonium]y , where the organic layers are composed of a random mixture of tetrabutylammonium and hexylammonium molecules...
October 18, 2017: Nature Communications
https://www.readbyqxmd.com/read/29038556/structural-and-morphological-evolution-for-water-resistant-organic-thermoelectrics
#15
Hyeon Jin Oh, Jae Gyu Jang, Jong-Gyu Kim, Jong-In Hong, Jaeyun Kim, Jeonghun Kwak, Sung Hyun Kim, Seunghan Shin
We systematically investigated the effect of 2,5-bis(2-hydroxy-3-methacryloyloxypropoxy)-1,4:3,6-dianhydro-sorbitol (Iso-GMA) with different concentrations on the structural and morphological evolution of poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) containing a fixed volume of dimethyl sulfoxide (DMSO) to realize water-resistant organic thermoelectric devices. As an additive, Iso-GMA is a hydrophilic and crosslinking agent that can interact with PEDOT and PSS chains by hydrogen bonding and/or dipole-dipole- or dipole-charge-interaction...
October 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28982009/field-effect-control-of-graphene-fullerene-thermoelectric-nanodevices
#16
Pascal Gehring, Achim Harzheim, Jean Spièce, Yuewen Sheng, Gregory Rogers, Charalambos Evangeli, Aadarsh Mishra, Benjamin J Robinson, Kyriakos Porfyrakis, Jamie H Warner, Oleg V Kolosov, G Andrew D Briggs, Jan A Mol
Although it was demonstrated that discrete molecular levels determine the sign and magnitude of the thermoelectric effect in single-molecule junctions, full electrostatic control of these levels has not been achieved to date. Here, we show that graphene nanogaps combined with gold microheaters serve as a testbed for studying single-molecule thermoelectricity. Reduced screening of the gate electric field compared to conventional metal electrodes allows control of the position of the dominant transport orbital by hundreds of meV...
October 11, 2017: Nano Letters
https://www.readbyqxmd.com/read/28913423/opto-thermophoretic-assembly-of-colloidal-matter
#17
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
#18
Yongjing Hu, Xiaofang Liu, Fengxing Jiang, Weiqiang Zhou, Congcong Liu, Xuemin Duan, Jingkun Xu
Conductive thiophene-based polymers have garnered great attention for use in organic electron materials such as electrochromic and thermoelectric materials. However, they suffer from poor electron transport properties and long-term stability, leading to 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 25, 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
#19
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
#20
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
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