Observation of anisotropy in thermoelectric properties of individual single-crystalline bismuth nanowires

Kim, Jeongmin; Roh, Jong Wook; Moon, Hyungsik Roger; Lee, Wooyoung

doi:10.1063/1.4994268

Cited by 12 publications

(8 citation statements)

References 26 publications

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“…For example, single-crystalline Bi nanowires were successfully fabricated by spontaneous growing on films based on thermal expansion mismatch of Bi film and the substrate via an OFF-ON method because of the thermally induced stress during annealing. [37] The TEM image of one single Bi nanowire reveals the successful fabrication (Figure 3a), confirmed by the HRTEM result with a characteristic lattice fringe distance indexed to (102) plane of Bi crystal (Figure 3b). [19,93] A selected area electron diffraction (SAED) pattern captured from a sample sliced normal to the growth direction, exhibits that the asfabricated Bi nanowires grow along the [110] direction ( Figure 3c).…”

Section: D Bi Nanowiresmentioning

confidence: 59%

“…Many researches have focused on new routes to the controllable synthesis of 1D nanostructures, such as hydrothermal methods, [56,101,102] solvothermal methods, [48,59] vacuum melting and pressure injection methods, [36] stress-induced methods, [40,103,104] radio frequency magnetron sputtering methods, [54] chemical dealloying, [105] closed space sublimation, [53] microwave heating of bulk bismuth. [49] The unique properties of as-synthesized 1D Bi nanomaterials can lead to a variety of applications such as electronics, [106,107] thermoelectrics, [13,37,108,109] optics, [110] sensors, [63,111] and catalysis, [35,43,52] which also encourages active researchers Reproduced with permission. [19] Copyright 2018, American Chemical Society.…”

Section: D Bi Nanoparticlesmentioning

confidence: 99%

Section: D Bi Nanotubesmentioning

confidence: 99%

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Emerging Mono‐Elemental Bismuth Nanostructures: Controlled Synthesis and Their Versatile Applications

Huang

Zhu

Wang

et al. 2020

Adv Funct Materials

149

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Bismuth (Bi), as a nontoxic and inexpensive diamagnetic heavy metal, has recently been utilized for the preparation of a variety of nanomaterials, such as nanoparticles, nanowires, nanotubes, nanosheets, etc., with a tunable bandgap, unique structure, excellent physicochemical properties, and compositional features for versatile properties, such as near‐infrared absorbance, high X‐ray attenuation coefficient, excellent photothermal conversion efficiency, and a long circulation half‐life. These features have endowed mono‐elemental Bi nanomaterials with desirable performances for electronics/optoelectronics, energy storage and conversion, catalysis, nonlinear photonics, sensors, biomedical applications, etc. This review summarizes the controlled synthesis of mono‐elemental Bi nanomaterials with different shapes and sizes, highlights the state‐of‐the‐art progress of the desired applications of mono‐elemental Bi nanomaterials, and presents some personal insights on the challenges and future opportunities in this research area. It is hoped that the controllable manipulation techniques of Bi nanomaterials, along with their unique properties, can shed light on the next‐generation devices based on Bi nanostructures and Bi‐related nanomaterials.

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Section: D Bi Nanowiresmentioning

confidence: 59%

Section: D Bi Nanoparticlesmentioning

confidence: 99%

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Emerging Mono‐Elemental Bismuth Nanostructures: Controlled Synthesis and Their Versatile Applications

Huang

Zhu

Wang

et al. 2020

Adv Funct Materials

149

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“…Thermoelectric (TE) devices are tools designed using semiconducting materials that can convert heat into electricity. 1 Several materials and structures [2][3][4][5] including nanostructures 6,7 have been investigated as TE materials. However, developing highly efficient TE materials is still a challenge.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric properties of oil fly ash-derived carbon nanotubes coated with polypyrrole

Salah

Alhebshi

Salah

et al. 2020

Journal of Applied Physics

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Oil fly ash has been reported to be suitable for producing low-cost carbon nanotubes (CNTs). These CNTs exhibit zigzag curved walls with an almost bamboo-like structure. Owing to this structure, these CNTs exhibit very low thermal conductivity as compared to other graphitic carbon materials. They also exhibit relatively low electrical conductivity. However, they exhibit a Seebeck coefficient comparable to that of commercially available CNTs. Therefore, it is of great importance to evaluate the thermoelectric (TE) properties of oil fly ash-derived CNTs. In this study, the TE properties of oil fly ash-derived CNTs were investigated. The CNTs were further coated with polypyrrole (PPy) to enhance their TE performance. PPy was used for the modification because of its attractive TE properties and its suitability as a binder for CNTs. The PPy coating significantly enhanced the electrical conductivity of the CNTs from ∼500 to ∼1300 S/m at room temperature. A small increase in the Seebeck coefficient was also observed. The power factor value increased from 0.1 to 0.6 μW/m K 2 . At 440 K, the power factor value was 1.4 μW/m K 2 . The thermal conductivity of the CNTs (∼1 W/m K) decreased significantly by a factor of 10 after the modification with PPy. The power generation characteristics of a single leg module made up of the p-type coated CNTs were investigated under real-time conditions in air. The results demonstrated the potential of the oil fly ash-derived CNTs coated with PPy for applications as TE materials.

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“…Beom [16] studied the transformed function representations of plane solutions for anisotropic elasticity and thermoelasticity; Zhu [17] developed an approximate method to solve anisotropic elliptic problems. These studies highlight the importance of anisotropic analysis, and quite a few theoretical models as well as experimental studies have also been developed to obtain the anisotropic parameters of various materials [18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Electric and heat conduction across an elliptic cavity in an anisotropic medium

Xie

Song

Gao

2019

Mathematics and Mechanics of Solids

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It is well known that the anisotropy of materials will significantly affect heat conduction, and the corresponding results have been applied to the thermal analysis of materials. An elliptic cavity in a nonlinearly coupled anisotropic medium, on the other hand, is much more difficult to analyze. Based on the complex variable method, the problem of a two-dimensional elliptical cavity in an anisotropic material is analyzed in this paper, and the field distributions have been obtained in closed-form. The field intensity factors are discussed in detail. The results show that both the temperature and electric potential gradients at a crack tip are always perpendicular to the crack surface, regardless of the anisotropy and the nonlinearity in the constitutive equations and the arbitrariness of loading direction. These results provide a powerful tool to analyze the effective behavior and reliability of anisotropic materials with cavities.

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Observation of anisotropy in thermoelectric properties of individual single-crystalline bismuth nanowires

Cited by 12 publications

References 26 publications

Emerging Mono‐Elemental Bismuth Nanostructures: Controlled Synthesis and Their Versatile Applications

Emerging Mono‐Elemental Bismuth Nanostructures: Controlled Synthesis and Their Versatile Applications

Thermoelectric properties of oil fly ash-derived carbon nanotubes coated with polypyrrole

Electric and heat conduction across an elliptic cavity in an anisotropic medium

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