Selective adsorption of bismuth telluride nanoplatelets through electrostatic attraction

Guo, Lingling; Aglan, Amira; Quan, Haiyu; Sun, Jian; Tang, Chaolong; Song, Jinhui; Szulczewski, Greg; Wang, Hung-Ta

doi:10.1039/c4cp00690a

Cited by 9 publications

(12 citation statements)

References 38 publications

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“…It should be noted that the thickness of as-synthesized nanoplatelets of 1 to 2 μm in diameter is usually ∼55 nm. 26 Because Bi 2 Te 3 /IL interfaces were ubiquitous in this sonicated Bi 2 Te 3 /IL sample, as evidenced by the increase in the UV−vis response, and the thicknesses were clearly reduced, we conclude that a significant amount of exfoliation had occurred within the [C 4 mim]Cl solvent. To further test the nanosheet dispersion stability, the sonicated sample was observed by UV−vis absorption over the course of 30 days, as presented in Figure 3d.…”

Section: Results and Analysismentioning

confidence: 99%

“…The overall thickness after the sonication is 15 ± 8 nm. It should be noted that the thickness of as-synthesized nanoplatelets of 1 to 2 μm in diameter is usually ∼55 nm …”

Section: Results and Analysismentioning

confidence: 99%

“…The as-synthesized and washed Bi 2 Te 3 nanoplatelets were characterized by scanning electron microscopy (SEM, JEOL 7000 FE), energy dispersive spectroscopy (EDX, Oxford instrument equipped with a JEOL 7000 FE), and X-ray diffraction (Bruker D8). Additional details of the syntheses can be found elsewhere. , …”

Section: Experimental Methodsmentioning

confidence: 99%

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Mechanism of Bismuth Telluride Exfoliation in an Ionic Liquid Solvent

Ludwig¹,

Guo²,

McCrary³

et al. 2015

Langmuir

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Bismuth telluride (Bi2Te3) is a well-known thermoelectric material that has a layered crystal structure. Exfoliating Bi2Te3 to produce two-dimensional (2D) nanosheets is extremely important because the exfoliated nanosheets possess unique properties, which can potentially revolutionize several material technologies such as thermoelectrics, heterogeneous catalysts, and infrared detectors. In this work, ionic liquid (IL) 1-butyl-3-methylimidazolium chloride ([C4mim]Cl) is used to exfoliate Bi2Te3 nanoplatelets. In both experiments and in molecular dynamics (MD) simulations, the Bi2Te3 nanoplatelets yield a stable dispersion of 2D nanosheets in the IL solvent, and our MD simulations provide molecular-level insight into the kinetics and thermodynamics of the exfoliation process. An analysis of the dynamics of Bi2Te3 during exfoliation indicates that the relative translation (sliding apart) of adjacent layers caused by IL-induced forces plays an important role in the process. Moreover, an evaluation of the MD trajectories and electrostatic interactions indicates that the [C4mim](+) cation is primarily responsible for initiating Bi2Te3 layer sliding and separation, while the Cl(-) anion is less active. Overall, our combined experimental and computational investigation highlights the effectiveness of IL-assisted exfoliation, and the underlying molecular-level insights should accelerate the development of future exfoliation techniques for producing 2D chalcogenide materials.

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Section: Results and Analysismentioning

confidence: 99%

“…The overall thickness after the sonication is 15 ± 8 nm. It should be noted that the thickness of as-synthesized nanoplatelets of 1 to 2 μm in diameter is usually ∼55 nm …”

Section: Results and Analysismentioning

confidence: 99%

See 1 more Smart Citation

Mechanism of Bismuth Telluride Exfoliation in an Ionic Liquid Solvent

Ludwig¹,

Guo²,

McCrary³

et al. 2015

Langmuir

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“…In the case of Bi 2 Te 3 on the other hand, it was shown that water adsorption is less pronounced than the adsorption of oxygen 26,36 , even though the reactivity of water with Bi 2 Te 3 is still under debate 26,27,37 . Except for the influence of adsorbates on the electronic structure, chemistry on TI surfaces has been largely ignored, even though it was shown that TIs hold great potential for sensing applications 38,39 and exfoliation in liquid environment has been used to obtain nanosheets with unique properties [40][41][42] . With respect to catalysis, the existence of TSS can modify the catalyst-adsorbate interactions 43 , e.g.…”

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confidence: 99%

Nanoscopic diffusion of water on a topological insulator

et al. 2020

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The microscopic motion of water is a central question, but gaining experimental information about the interfacial dynamics of water in fields such as catalysis, biophysics and nanotribology is challenging due to its ultrafast motion, and the complex interplay of intermolecular and molecule-surface interactions. Here we present an experimental and computational study of the nanoscale-nanosecond motion of water at the surface of a topological insulator (TI), Bi 2 Te 3. Understanding the chemistry and motion of molecules on TI surfaces, while considered a key to design and manufacturing for future applications, has hitherto been hardly addressed experimentally. By combining helium spin-echo spectroscopy and density functional theory calculations, we are able to obtain a general insight into the diffusion of water on Bi 2 Te 3. Instead of Brownian motion, we find an activated jump diffusion mechanism. Signatures of correlated motion suggest unusual repulsive interactions between the water molecules. From the lineshape broadening we determine the diffusion coefficient, the diffusion energy and the pre-exponential factor.

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“…In addition, the atom layers of Bi 2 Te 3 and similar compounds have a -Te(1)-Bi(Sb)-Te(2)-Bi(Sb)-Te(1) structure. 6,35 Here, Te has two different coordination environments in the crystal structure. The two adjacent Te(1) layers along the c-axis interact with each other by van der Waals forces, which is not strong enough to fix an atom on the smooth surface.…”

Section: Structure Of the (015) Oriented Branchesmentioning

confidence: 99%

Towards high refrigeration capability: the controllable structure of hierarchical Bi_0.5Sb_1.5Te₃ flakes on a metal electrode

Cao

Deng

Gao

et al. 2015

Phys. Chem. Chem. Phys.

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The refrigeration capability of a thermoelectric device is dictated by interfacial effects and the figure of merit ZT, which govern the contact resistance and the Carnot efficiency for heat conversion. Here we report a controllable (110) oriented Bi0.5Sb1.5Te3 film grown on a Cu film electrode. The hierarchical Bi0.5Sb1.5Te3 film is composed of tens of cactus like flakes that have a (110) oriented backbone and abundant 50-80 nm branches in the (015) direction. The lattice mismatch of the (110) oriented Bi0.5Sb1.5Te3 to the Cu electrode is estimated to be approximately 2.4%, which implies a decreased interfacial dislocation density and formation of fewer interfacial defects leading to low contact resistance (1.0 × 10(-9) Ω m(2)). The enhanced out plane ZT ≈ 0.73 is calculated from the in plane properties. Hence a maximum heat-flux pumping capability of 138 W cm(-2) can be obtained for Tc = 400 K and the corresponding temperature difference is 6 K. Our work indicates that the control of the metal-semiconductor interfacial structure is an efficient approach to improve the refrigeration capability.

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Selective adsorption of bismuth telluride nanoplatelets through electrostatic attraction

Abstract: A controllable adsorption of solution grown Bi2Te3nanoplatelets is demonstrated.

Cited by 9 publications

References 38 publications

Mechanism of Bismuth Telluride Exfoliation in an Ionic Liquid Solvent

Mechanism of Bismuth Telluride Exfoliation in an Ionic Liquid Solvent

Nanoscopic diffusion of water on a topological insulator

Towards high refrigeration capability: the controllable structure of hierarchical Bi_0.5Sb_1.5Te₃ flakes on a metal electrode

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Selective adsorption of bismuth telluride nanoplatelets through electrostatic attraction

Abstract: A controllable adsorption of solution grown Bi2Te3nanoplatelets is demonstrated.

Cited by 9 publications

References 38 publications

Mechanism of Bismuth Telluride Exfoliation in an Ionic Liquid Solvent

Mechanism of Bismuth Telluride Exfoliation in an Ionic Liquid Solvent

Nanoscopic diffusion of water on a topological insulator

Towards high refrigeration capability: the controllable structure of hierarchical Bi0.5Sb1.5Te3 flakes on a metal electrode

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Product

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Towards high refrigeration capability: the controllable structure of hierarchical Bi_0.5Sb_1.5Te₃ flakes on a metal electrode