Properties of Nanostructured One-Dimensional and Composite Thermoelectric Materials

MRS Bulletin ◽  
2006 ◽  
Vol 31 (3) ◽  
pp. 218-223 ◽  
Author(s):  
Apparao M. Rao ◽  
Xiaohua Ji ◽  
Terry M. Tritt
Keyword(s):  
Thermoelectric Properties ◽  
Thermoelectric Materials ◽  
Vapor Deposition ◽  
Composite Structures ◽  
Carbon Nanostructures ◽  
Chemical Vapor ◽  
One Dimensional ◽  
Bulk Matrix ◽  
Low Dimensional

AbstractOver a decade ago, Dresselhaus predicted that low-dimensional systems would one day serve as a route to enhanced thermoelectric performance.In this article, recent results in the thermoelectric properties of nanowires and nanotubes are discussed. Various synthesis techniques will be presented, including chemical vapor deposition for the growth of thermoelectric nanostructures in templated alumina.Electrical transport measurements of carbon nanostructures, such as resistivity and thermopower, have revealed some very interesting thermoelectric properties.Challenges still remain concerning the measurement of individual nanostructures such as nanowires.Much work has been performed on the thermoelectric properties of carbon nanotubes, and these results will be highlighted.In addition, routes for enhanced thermoelectric materials have focused on incorporating nanostructures within the bulk materials.The role of these “hybrid composite structures” based on nanomaterials incorporated into the bulk matrix and the potential for enhanced performance are discussed.

Study of the Role of Small Additions of Zr in the CVD- FBR Aluminization Process

2009 ◽  
Vol 289-292 ◽  
pp. 293-300
Author(s):  
L. Sánchez ◽  
F.J. Bolívar ◽  
M.P. Hierro ◽  
F.J. Pérez
Keyword(s):  
Fluidized Bed ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Fluidized Bed Reactor ◽  
Iron Aluminide ◽  
Martensitic Steels ◽  
Aluminide Coatings ◽  
Deposition Parameters ◽  
Zirconium Powder

In this work, iron aluminide coatings were developed by Chemical Vapor Deposition in Fluidized Bed Reactor (CVD-FBR) on ferritic-martensitic steels. Small additions of zirconium powder were introduced in the fluidized bed; as a consequence, the obtained coatings are thicker than that without zirconium additions. When Zr powders are added in the fluidized bed, the deposition atmosphere drastically changes, leading to increase the deposition rate. Thermodynamic calculations were carried out to simulate the modifications in the CVD atmosphere in the Al/Zr deposition system in comparison to the single aluminization. In order to optimize the conditions of the deposition, parameters such as temperature and concentration of zirconium introduced into the bed were evaluated and compared with the results obtained for the single aluminum deposition.

scholarly journals Blackbody-sensitive room-temperature infrared photodetectors based on low-dimensional tellurium grown by chemical vapor deposition

2021 ◽  
Vol 7 (16) ◽  
pp. eabf7358
Author(s):  
Meng Peng ◽  
Runzhang Xie ◽  
Zhen Wang ◽  
Peng Wang ◽  
Fang Wang ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Room Temperature ◽  
Spectral Response ◽  
Chemical Vapor ◽  
Hole Mobility ◽  
Infrared Detection ◽  
Infrared Photodetectors ◽  
Bandgap Semiconductors ◽  
Low Dimensional

Blackbody-sensitive room-temperature infrared detection is a notable development direction for future low-dimensional infrared photodetectors. However, because of the limitations of responsivity and spectral response range for low-dimensional narrow bandgap semiconductors, few low-dimensional infrared photodetectors exhibit blackbody sensitivity. Here, highly crystalline tellurium (Te) nanowires and two-dimensional nanosheets were synthesized by using chemical vapor deposition. The low-dimensional Te shows high hole mobility and broadband detection. The blackbody-sensitive infrared detection of Te devices was demonstrated. A high responsivity of 6650 A W−1 (at 1550-nm laser) and the blackbody responsivity of 5.19 A W−1 were achieved. High-resolution imaging based on Te photodetectors was successfully obtained. All the results suggest that the chemical vapor deposition–grown low-dimensional Te is one of the competitive candidates for sensitive focal-plane-array infrared photodetectors at room temperature.

On the carbo-thermal reduction of silica for carbon nano-fibre formation via CVD

2011 ◽  
Vol 1284 ◽  
Author(s):  
Alicja Bachmatiuk ◽  
Felix Börrnert ◽  
Imad Ibrahim ◽  
Bernd Büchner ◽  
Mark H. Rümmeli
Keyword(s):  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Carbothermal Reduction ◽  
Carbon Nanostructures ◽  
Reduction Process ◽  
Chemical Vapor ◽  
Deposition Process ◽  
Thermal Reduction ◽  
Fibre Formation ◽  
Quartz Substrates

ABSTRACTThe formation of carbon nanostructures using silica nanoparticles from quartz substrates as a catalyst in an aerosol assisted chemical vapor deposition process was examined. The silica particles are reduced to silicon carbide via a carbothermal reduction process. The recyclability of the explored quartz substrates is also presented. The addition of triethyl borate improves the efficiency of the carbothermal reduction process and carbon nanotubes formation. Moreover, the addition of hydrogen during the chemical vapor deposition leads to the helical carbon nanostructures formation.

Preparation and growth mechanism of one-dimensional NdB6 nanostructures: nanobelts, nanoawls, and nanotubes

RSC Advances ◽  
2016 ◽  
Vol 6 (48) ◽  
pp. 41891-41896 ◽  
Author(s):  
Wei Han ◽  
Yanming Zhao ◽  
Qinghua Fan ◽  
Qidong Li
Keyword(s):  
Chemical Vapor Deposition ◽  
Growth Mechanism ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
One Dimensional

1D NdB6 nanostructures (nanobelts, nanoawls, and nanotubes) have been synthesized through a chemical vapor deposition (CVD) process with a self-catalyzed mechanism.

Role of Hydrogen in Graphene Chemical Vapor Deposition Growth on a Copper Surface

2014 ◽  
Vol 136 (8) ◽  
pp. 3040-3047 ◽  
Author(s):  
Xiuyun Zhang ◽  
Lu Wang ◽  
John Xin ◽  
Boris I. Yakobson ◽  
Feng Ding
Keyword(s):  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Copper Surface ◽  
Chemical Vapor Deposition Growth

Optimisation of Microcrystaline Silicon Deposited by Expanding Thermal Plasma Chemical Vapor Deposition for Solar-Cell Application

2007 ◽  
Vol 989 ◽  
Author(s):  
Raul Jimenez Zambrano ◽  
R.A.C.M.M. van Swaaij ◽  
M.C.M. van de Sanden
Keyword(s):  
Chemical Vapor Deposition ◽  
Thermal Plasma ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Ir Absorption ◽  
Solar Cell Application ◽  
Ion Energy ◽  
Plasma Chemical Vapor Deposition ◽  
Absorption Measurements

AbstractThe causes for the porosity of the microcrystalline material deposited by the expanding thermal plasma (ETP) chemical vapor deposition (CVD) technique have been investigated through IR-absorption measurements. The role of impinging ions on the structure of the material is discussed in relation to the hydrogen bounding configuration (microcrystalline factor). The ion energy is controlled through external RF biasing. Correlation between biasing and reduction of porosity is presented. The influence of high deposition pressure is as well studied, related with changes in a-Si structure.

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