Diameter-dependent thermoelectric figure of merit in single-crystalline Bi nanowires

Kim, Jeongmin; Lee, Seung–Hyun; Brovman, Yuri M.; Kim, Philip; Lee, Wooyoung

doi:10.1039/c4nr06412g

Cited by 60 publications

(117 citation statements)

References 39 publications

(128 reference statements)

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“…Of several methods to increase the PF value, the reduction of the confinement length L, which is defined by the effective size of the electron wave functions in the nonprincipal direction for low-dimensional materials, such as the thickness in thin films and the diameter in nanowires, might be the most straightforward technique, since it was proven to substantially increase ZT [5,[8][9][10]. A groundbreaking theoretical study by Hicks and Dresselhaus in 1993 predicted that a decrease in L can increase the PF and ZT of low-dimensional structures [11,12].…”

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confidence: 99%

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Quantum Effects in the Thermoelectric Power Factor of Low-Dimensional Semiconductors

et al. 2016

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We theoretically investigate the interplay between the confinement length L and the thermal de Broglie wavelength Λ to optimize the thermoelectric power factor of semiconducting materials. An analytical formula for the power factor is derived based on the one-band model assuming nondegenerate semiconductors to describe quantum effects on the power factor of the low-dimensional semiconductors. The power factor is enhanced for one-and two-dimensional semiconductors when L is smaller than Λ of the semiconductors. In this case, the low-dimensional semiconductors having L smaller than their Λ will give a better thermoelectric performance compared to their bulk counterpart. On the other hand, when L is larger than Λ, bulk semiconductors may give a higher power factor compared to the lower dimensional ones.

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confidence: 99%

“…The experimental data in Fig. 3 are obtained from the PF values of 1D Bi nanowires [10], 1D Si nanowires [5], 2D Si quantum wells [21], and two different experiments on 2D PbTe quantum wells labeled by PbTe-1 and PbTe-2 [ [23], which are necessary to put all the experimental results into Fig. 3.…”

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confidence: 99%

Quantum Effects in the Thermoelectric Power Factor of Low-Dimensional Semiconductors

et al. 2016

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“…Instead, a trend toward larger pore MSNs, HMSNs, and other pore-expanded MSNs that are capable of delivering larger compounds for genetic or peptide therapy applications have been shown to be more effective in targeting cancer resistant cells [462]. With pore expansion techniques, as those mentioned earlier with TMB, delivery of larger proteins [383,[463][464][465] and even genetic material [207,391] are possible.…”

Section: Drug Deliverymentioning

confidence: 99%

“…Bismuth nanotube and nanowires [383] have been shown theoretically to undergo a semimetal-to-semiconductor transition below a critical radius, due to energy band quantization from quantum confinement effects as well as classical scattering. This modification in the electronic structure has been experimentally demonstrated, along with the corresponding zT enhancement [384].…”

Section: Thermoelectricsmentioning

confidence: 99%

Template-based syntheses for shape controlled nanostructures

Pérez-Page

et al. 2016

Advances in Colloid and Interface Science

137

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A variety of nanostructured materials are produced through template-based synthesis methods, including zerodimensional, 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. In the first section, the templates have been discussed while in the second section, their corresponding synthesis methods have been briefly reviewed, and lastly in the third section, applications of the materials themselves are highlighted. Some examples of the templates frequently encountered are organic structure directing agents, surfactants, polymers, carbon frameworks, colloidal sol-gels, inorganic frameworks, and nanoporous membranes. Synthesis methods that adopt these templates include emulsion-based routes and template-filling approaches, such as self-assembly, electrodeposition, electroless deposition, vapor deposition, and other methods including layer-by-layer and lithography. Templatebased synthesized nanomaterials are frequently encountered in select fields such as solar energy, thermoelectric materials, catalysis, biomedical applications, and magnetowetting of surfaces.

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“…Low dimensional materials such as carbon nanotubes [1][2][3][4][5][6] , inorganic nanowires [7][8][9][10][11][12] , organic nanofibers [13][14][15] , superlattices 16,17 , and two dimensional materials [18][19][20][21][22][23][24] have been the focus of significant research interest over the past two decades due to their unique thermal transport properties which can be significantly different than in their bulk form. In addition to establishing fundamental structure-property relationships in these materials, these investigations have also enabled novel thermal device applications [25][26][27][28][29] .…”

Section: Introductionmentioning

confidence: 99%

Ultra-high resolution steady-state micro-thermometry using a bipolar direct current reversal technique

Pettes

2016

Review of Scientific Instruments

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The suspended micro-thermometry measurement technique is one of the most prominent methods for probing the in-plane thermal conductance of low dimensional materials, where a suspended microdevice containing two built-in platinum resistors that serve as both heater and thermometer is used to measure the temperature and heat flow across a sample. The presence of temperature fluctuations in the sample chamber and background thermal conductance through the device, residual gases, and radiation are dominant sources of error when the sample thermal conductance is comparable to or smaller than the background thermal conductance, on the order of 300 pW/K at room temperature. In this work, we present a high resolution thermal conductance measurement scheme in which a bipolar direct current reversal technique is adopted to replace the lock-in technique. We have demonstrated temperature resolution of 1.0–2.6 mK and thermal conductance resolution of 1.7–26 pW/K over a temperature range of 30–375 K. The background thermal conductance of the suspended microdevice is determined accurately by our method and allows for straightforward isolation of this parasitic signal. This simple and high-throughput measurement technique yields an order of magnitude improvement in resolution over similarly configured lock-in amplifier techniques, allowing for more accurate investigation of fundamental phonon transport mechanisms in individual nanomaterials.

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Diameter-dependent thermoelectric figure of merit in single-crystalline Bi nanowires

Cited by 60 publications

References 39 publications

Quantum Effects in the Thermoelectric Power Factor of Low-Dimensional Semiconductors

Quantum Effects in the Thermoelectric Power Factor of Low-Dimensional Semiconductors

Template-based syntheses for shape controlled nanostructures

Ultra-high resolution steady-state micro-thermometry using a bipolar direct current reversal technique

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