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organic thermoelectric

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...
January 6, 2017: Chemosphere
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
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
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
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.]
Sunbin Hwang, William J Potscavage, Yu Seok Yang, In Seob Park, Toshinori Matsushima, Chihaya Adachi
Recent progress in conducting polymer-based organic thermoelectric generators (OTEGs) has resulted in high performance due to high Seebeck coefficient, high electrical conductivity (σ), and low thermal conductivity obtained by chemically controlling the materials's redox levels. In addition to improving the properties of individual OTEGs to obtain high performance, the development of solution processes for the fabrication of OTEG modules is necessary to realize large thermoelectric voltage and low-cost mass production...
October 12, 2016: Physical Chemistry Chemical Physics: PCCP
Woongki Lee, Myeonghun Song, Soohyung Park, Sungho Nam, Jooyeok Seo, Hwajeong Kim, Youngkyoo Kim
Organic thermoelectric devices (OTEDs) are recognized one of the next generation energy conversion platforms because of their huge potentials for securing electricity continuously from even tiny heat sources in our daily life. The advantage of OTEDs can be attributable to the design freedom in device shapes and the low-cost fabrication by employing solution coating processes at low temperatures. As one of the major OTE materials to date, poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) has been used, but no study has been yet carried out on its acidity control even though the acidic components in OTEDs can seriously affect the device performance upon operation...
September 26, 2016: Scientific Reports
Wei Ma, Ke Shi, Yang Wu, Zuo-Yu Lu, Han-Yu Liu, Jie-Yu Wang, Jian Pei
The detailed relationship between film morphology and the performance of solution processed n-type organic thermoelectric (TE) devices is investigated. It is interesting to find that the better ordered molecular packing of n-type polymer can be achieved by adding a small fraction of dopant molecules, which is not observed before. The better ordered structure will be favorable for the charge carrier mobility. Meanwhile, dopant molecules improve free carrier concentration via doping reaction. As a result, a significantly enhanced electrical conductivity (12 S cm(-1)) and power factor (25...
September 21, 2016: ACS Applied Materials & Interfaces
Zeng Fan, Donghe Du, Zhimeng Yu, Pengcheng Li, Yijie Xia, Jianyong Ouyang
UNLABELLED: Conducting polymers have promising thermoelectric application because they have many advantages including abundant elements, mechanical flexibility, and nontoxicity. The thermoelectric properties of conducting polymers strongly depend on their chemical structure and microstructure. Here, we report a novel and facile method to significantly enhance the thermoelectric properties of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) ( PEDOT: PSS) films through a treatment with organic solutions of inorganic salts...
September 7, 2016: ACS Applied Materials & Interfaces
Cheng Jin An, Young Hun Kang, A-Young Lee, Kwang-Suk Jang, Youngjin Jeong, Song Yun Cho
We suggest the fabrication of foldable thermoelectric (TE) materials by embedding conducting polymers into Au-doped CNT webs. The CNT bundles, which are interconnected by a direct spinning method to form 3D networks without interfacial contact resistance, provide both high electrical conductivity and high carrier mobility. The ZT value of the spun CNT web is significantly enhanced through two simple processes. Decorating the porous CNT webs with Au nanoparticles increases the electrical conductivity, resulting in an optimal ZT of 0...
August 31, 2016: ACS Applied Materials & Interfaces
Dazhen Huang, Chao Wang, Ye Zou, Xingxing Shen, Yaping Zang, Hongguang Shen, Xike Gao, Yuanping Yi, Wei Xu, Chong-An Di, Daoben Zhu
Development of chemically doped high performance n-type organic thermoelectric (TE) materials is of vital importance for flexible power generating applications. For the first time, bismuth (Bi) n-type chemical doping of organic semiconductors is described, enabling high performance TE materials. The Bi interfacial doping of thiophene-diketopyrrolopyrrole-based quinoidal (TDPPQ) molecules endows the film with a balanced electrical conductivity of 3.3 S cm(-1) and a Seebeck coefficient of 585 μV K(-1) ...
August 26, 2016: Angewandte Chemie
Baoquan Sun, Mingwang Shao, Shuitong Lee
The use of nanostructured silicon for the generation of electricity in flexible and mobile devices is reviewed. This field has attracted widespread interest in recent years due to the emergence of plastic electronics. Such developments are likely to alter the nature of power sources in the near future. For example, flexible photovoltaic cells can supply electricity to rugged and collapsible electronics, biomedical devices, and conformable solar panels that are integrated with the curved surfaces of vehicles or buildings...
December 2016: Advanced Materials
Mario Einax, Abraham Nitzan
The performance of nano-scale energy conversion devices is studied in the framework of state-space models where a device is described by a graph comprising states and transitions between them represented by nodes and links, respectively. Particular segments of this network represent input (driving) and output processes whose properly chosen flux ratio provides the energy conversion efficiency. Simple cyclical graphs yield Carnot efficiency for the maximum conversion yield. We give general proof that opening a link that separate between the two driving segments always leads to reduced efficiency...
July 7, 2016: Journal of Chemical Physics
Nianduan Lu, Ling Li, Ming Liu
Carrier thermoelectric-transport theory has recently become of growing interest and numerous thermoelectric-transport models have been proposed for organic semiconductors, due to pressing current issues involving energy production and the environment. The purpose of this review is to provide a theoretical description of the thermoelectric Seebeck effect in organic semiconductors. Special attention is devoted to the carrier concentration, temperature, polaron effect and dipole effect dependence of the Seebeck effect and its relationship to hopping transport theory...
July 20, 2016: Physical Chemistry Chemical Physics: PCCP
Renee Kroon, Desalegn Alemu Mengistie, David Kiefer, Jonna Hynynen, Jason D Ryan, Liyang Yu, Christian Müller
Thermoelectric plastics are a class of polymer-based materials that combine the ability to directly convert heat to electricity, and vice versa, with ease of processing. Potential applications include waste heat recovery, spot cooling and miniature power sources for autonomous electronics. Recent progress has led to surging interest in organic thermoelectrics. This tutorial review discusses the current trends in the field with regard to the four main building blocks of thermoelectric plastics: (1) organic semiconductors and in particular conjugated polymers, (2) dopants and counterions, (3) insulating polymers, and (4) conductive fillers...
November 7, 2016: Chemical Society Reviews
Liming Wang, Qin Yao, Juanxiu Xiao, Kaiyang Zeng, Wei Shi, Sanyin Qu, Lidong Chen
Polyaniline (PANI) is one of the most promising candidates for flexible organic thermoelectric (TE) applications owing to its relatively low cost and high stability. Herein, the self-assembled supramolecule (SAS) (3,6-dioctyldecyloxy-1,4-benzenedicarboxylic acid) was used as an additive and was introduced into PANI films as a template. Raman spectroscopy, X-ray diffraction, and conductive atomic force microscopy analyses demonstrated that the highly ordered chain structure of PANI was achieved by chemical interactions between PANI and the SAS...
July 5, 2016: Chemistry, An Asian Journal
Richard D Rabbitt, Alan M Brichta, Hessam Tabatabaee, Peter J Boutros, JoongHo Ahn, Charles C Della Santina, Lauren A Poppi, Rebecca Lim
In the present study we combined electrophysiology with optical heat pulse stimuli to examine thermodynamics of membrane electrical excitability in mammalian vestibular hair cells and afferent neurons. We recorded whole cell currents in mammalian type II vestibular hair cells using an excised preparation (mouse) and action potentials (APs) in afferent neurons in vivo (chinchilla) in response to optical heat pulses applied to the crista (ΔT ≈ 0.25°C per pulse). Afferent spike trains evoked by heat pulse stimuli were diverse and included asynchronous inhibition, asynchronous excitation, and/or phase-locked APs synchronized to each infrared heat pulse...
August 1, 2016: Journal of Neurophysiology
María Pérez-Page, Erick Yu, Jun Li, Masoud Rahman, Daniel M Dryden, Ruxandra Vidu, Pieter Stroeve
A variety of nanostructured materials are produced through template-based synthesis methods, including zero-dimensional, one-dimensional, and two-dimensional structures. These span different forms such as nanoparticles, nanowires, nanotubes, nanoflakes, and nanosheets. Many physical characteristics of these materials such as the shape and size can be finely controlled through template selection and as a result, their properties as well. Reviewed here are several examples of these nanomaterials, with emphasis specifically on the templates and synthesis routes used to produce the final nanostructures...
August 2016: Advances in Colloid and Interface Science
Mohammad Abir Hossain, Seyedhamidreza Alaie, Mehran Tehrani
The design and development of a novel apparatus for the simultaneous measurement of electrical resistivity and Seebeck coefficient of films is reported here. Mounting stage is integrated inside a cryostat chamber enabling measurements over the 10-400 K temperature range, intended for organic thermoelectrics. Finite element method was used to analyze the thermo-mechanical response of the sample holder. The apparatus was validated against high purity nickel film, and a very good agreement was found.
April 2016: Review of Scientific Instruments
Liming Wang, Qin Yao, Juanxiu Xiao, Kaiyang Zeng, Sanyin Qu, Wei Shi, Qun Wang, Lidong Chen
Single-walled carbon nanotubes (SWNTs)/polyaniline (PANI) composite films with enhanced thermoelectric properties were prepared by combining in situ polymerization and solution processing. Conductive atomic force microscopy and X-ray diffraction measurements confirmed that solution processing and strong π-π interactions between the PANI and SWNTs induced the PANI molecules to form a highly ordered structure. The improved degree of order of the PANI molecular arrangement increased the carrier mobility and thereby enhanced the electrical transport properties of PANI...
June 21, 2016: Chemistry, An Asian Journal
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