Prospects for Bismuth Nanowires as Thermoelectrics

1998 ◽  
Vol 545 ◽  
Author(s):  
M. S. Dresselhausa ◽  
Z. Zhang ◽  
X. Sun ◽  
J. Y. Ying ◽  
J. Heremans ◽  
...  
Keyword(s):  
Quantum Confinement ◽  
Electronic Band Structure ◽  
Electron Gas ◽  
Electronic Band ◽  
Nanowire Diameter ◽  
Crystalline Orientation ◽  
One Dimensional ◽  
Quantum Confinement Effects ◽  
High Anisotropy ◽  
Bismuth Nanowires

AbstractThe small effective mass of Bi, high anisotropy of its Fermi surface, and the high aspect ratio (length/diameter) of Bi nanowires make this an excellent system for studying quantum confinement effects of a one-dimensional (ID) electron gas in relation to electrical conductivity, thermoelectric power, and thermal conductivity. A theoretical model based on the basic electronic band structure of bulk Bi is suitably modified to describe 1D bismuth nanowires and is used to predict the dependence of these transport properties on nanowire diameter, temperature and crystalline orientation of the bismuth nanowires. Experiments have been carried out on ultra-fine single crystal Bi nanowires (10–120 nm diameter) with a packing density as high as 7 × 1010 wires/cm2 to test the quantum confinement assumptions of the model and the occurrence of a quantum confinement-induced semimetal-to-semiconductor transition as the wire diameter becomes less than 100 nm. Prospects for the use of bismuth nanowires for thermoelectric applications are discussed.

Theoretical Modeling of Thermoelectricity in Bi Nanowires

1998 ◽  
Vol 545 ◽  
Author(s):  
X. Sun ◽  
Z. Zhang ◽  
G. Dresselhaus ◽  
M. S. Dresselhaus ◽  
J. Y. Ying ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Theoretical Model ◽  
Quantum Confinement ◽  
Figure Of Merit ◽  
Wire Diameter ◽  
Thermoelectric Figure Of Merit ◽  
Thermoelectric Figure ◽  
Crystalline Orientation ◽  
One Dimensional ◽  
Bismuth Nanowires

AbstractBismuth as a semimetal is not a good thermoelectric material in bulk form because of the approximate cancellation between the electron and hole contributions. However, quantum confinement can be introduced by making Bi nanowires to move the lowest conduction subband edge up and the highest valence subband edge down to get a one-dimensional (1D) semiconductor at some critical wire diameter dc. A theoretical model based on the basic band structure of bulk Bi is developed to predict the dependence of these quantities on wire diameter and on the crystalline orientation of the bismuth nanowires. Numerical modeling is performed for trigonal, binary and bisectrix crystal orientations. By carefully tailoring the Bi wire diameter and carrier concentration, substantial enhancement in the thermoelectric figure of merit is expected for small nanowire diameters.

Probing quantum confinement effects on the excitonic property and electronic band structures of MoS2

2020 ◽  
Vol 519 ◽  
pp. 146262
Author(s):  
Xudan Zhu ◽  
Dahai Li ◽  
Rongjun Zhang ◽  
Hao Zhang ◽  
Chunxiao Cong ◽  
...  
Keyword(s):  
Quantum Confinement ◽  
Confinement Effects ◽  
Band Structures ◽  
Electronic Band ◽  
Quantum Confinement Effects ◽  
Electronic Band Structures

The electronic band structure of quasi-one-dimensional van der Waals semiconductors: the effective hole mass of ZrS3 compared to TiS3

2020 ◽  
Vol 32 (29) ◽  
pp. 29LT01 ◽  
Author(s):  
Hemian Yi ◽  
Simeon J Gilbert ◽  
Alexey Lipatov ◽  
Alexander Sinitskii ◽  
Jose Avila ◽  
...  
Keyword(s):  
Band Structure ◽  
Electronic Band Structure ◽  
Van Der Waals ◽  
Electronic Band ◽  
One Dimensional

MXene nanoribbons

2015 ◽  
Vol 3 (4) ◽  
pp. 879-888 ◽  
Author(s):  
Shijun Zhao ◽  
Wei Kang ◽  
Jianming Xue
Keyword(s):  
Quantum Confinement ◽  
Confinement Effects ◽  
One Dimensional ◽  
Quantum Confinement Effects

Quasi-one-dimensional nanoribbons have great potential for applications in nanoelectronics and nanospintronics due to their unique quantum confinement effects.

Growth and Epitaxy of ZnO Nanowires on Brass Substrates

2013 ◽  
Vol 850-851 ◽  
pp. 3-6
Author(s):  
Chao Wang ◽  
Rong Sheng Cai ◽  
Fei Yu Diao ◽  
Lu Yuan ◽  
Guang Wen Zhou ◽  
...  
Keyword(s):  
Optical Properties ◽  
Quantum Confinement ◽  
Nanostructured Material ◽  
Zno Nanowires ◽  
Zno Nanowire ◽  
Epitaxial Relationship ◽  
One Dimensional ◽  
Quantum Confinement Effects ◽  
Low Dimensionality ◽  
One Dimensional Nanostructures

One-dimensional nanostructures exhibit interesting electronic and optical properties due to their low dimensionality leading to quantum confinement effects. ZnO has received lot of attention as a nanostructured material because of unique properties rendering it suitable for various applications. In this paper, ZnO nanowires are synthesized in large quantity through thermal oxidation of brass (Cu0.7Zn0.3alloy). The epitaxial relationship between the brass substrates and ZnO layer and the epitaxial relationship between the ZnO nanowire and ZnO layer have been examined.

PROPERTIES OF ZnO NANOWIRES AND FUNCTIONAL NANOCOMPOSITES

2008 ◽  
Vol 07 (01) ◽  
pp. 29-35 ◽  
Author(s):  
RYSZARD PYRZ
Keyword(s):  
Cross Section ◽  
Electronic Band Structure ◽  
Zno Nanowires ◽  
Sensors And Actuators ◽  
Electronic Band ◽  
One Dimensional ◽  
Mechanical Coupling ◽  
Deformation State ◽  
Dynamics Simulations ◽  
Controllable Size

One-dimensional structures like nanotubes and nanowires are potential candidates for nanoscale sensors and actuators. Furthermore, the nanoscale cross-section of these elements introduces controllable size effects while the macroscopic length ensures good mechanical coupling to matrix materials and thus reinforcing effects in nanocomposites. Molecular dynamics simulations are employed to study the electronic and mechanical properties of smallest ZnO nanowires. It has been shown that the electronic band structure of nanowires varies with uniaxial strain and this property can be used for sensing deformation state when nanowires are embedded in a polymer matrix.

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