Stretch‐Driven Increase in Ultrahigh Thermal Conductance of Hydrogenated Borophene and Dimensionality Crossover in Phonon Transmission

Li, Dengfeng; He, Jia; Ding, Guangqian; Tang, Qiqi; Yan, Ying; He, Junjie; Zhong, Chengyong; Liu, Yi; Feng, Chunbao; Sun, Qilong; Zhou, Hangbo; Zhou, Ping; Zhang, Gang

doi:10.1002/adfm.201801685

Cited by 86 publications

(47 citation statements)

References 62 publications

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“…We further tested the bandwidth of the as‐built MZI device with a sine wave‐type pump (see Figure S1, Supporting Information), which indicates a response time limit of ≈0.41 ms, being well consistent with above results. The superior photo‐thermal response might be attributed to the lower mass of boron atom, which, combined with the high stiffness of lattice structure, gives higher electron‐phonon coupling and thus higher phonon velocities, implying more efficient thermal transport . The detailed mechanism, however, deserves further investigations.…”

Section: Comparison Of Different 2d Materials‐based Similar Devicesmentioning

confidence: 99%

Boron Nanosheets for Efficient All‐Optical Modulation and Logic Operation

Guo

Shao

et al. 2019

Advanced Optical Materials

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As the left neighbor of carbon in the periodic table, boron is very similar to carbon in electronic properties and strong bonding characters, and both undertake important roles in living organisms. [8][9][10][11] However, due to the unique trivalent electronic configuration, boron is among the most chemically versatile elements, which shows polymorphism in low-dimensional structures and thus richer properties, such as high-temperature superconductivity, high carrier mobility, massless Dirac fermions, superhardness, to name a few. [12][13][14][15][16][17][18][19][20][21] Although the 2D form borophene has recently been experimentally realized by several groups under ultrahigh-vacuum conditions and by another one with chemical vapor deposition (CVD), [12,15,22,23] the related researches of borophene are still mainly concentrated on theoretical predictions and computational calculations. [13,20,21,[24][25][26][27][28] Experimental work is largely lagged behind, which, to a large extent, is due to its chemical and structural complexities and thus challenging synthesis. [13,14] On the other hand, up to now, most of 2D boron-related researches are on the electronic and mechanical properties by theoretical methods, let alone experimental study of its optical properties and related applications. According to several recent theoretical predictions, 2D boron bears fascinating features that are totally different from other 2D materials, such as thicknessdependent transparency and visible/near-infrared plasmons. [26,27] Here, based on liquid-exfoliated boron nanosheets, for the first time, we demonstrate an all-optical phase shifter at the telecommunication band that is mediated by the efficient photo-thermal response in boron nanosheets. The constructed phase shifter shows an order of magnitude faster response speed and higher modulation efficiency compared with other 2D material-based similar devices. Consequently, a high-efficiency and stable allfiber, all-optical modulator was successfully realized based on a Mach-Zehnder interferometer (MZI) configuration, which could be further employed for all-optical logic gating operations. As proof-of-concept demonstrations, we successfully achieved all-optical logic AND and NOT gates by exploiting the superior photo-thermal response in boron nanosheets. Our work marks an important step toward exploring the optical and photonic applications of 2D boron nanosheets.Due to its unique trivalent electronic configuration, boron features richer properties as well as higher chemical and structural complexities compared with its right neighbor carbon. Consequently, over a decade later than the exfoliation of graphene, borophene has just been experimentally demonstrated on certain metal substrates and under ultrahigh-vacuum conditions, which, however, limit its wide and in-depth experimental researches. Here, for the first time, by employing liquid-exfoliated boron nanosheets, all-optical signal processing application is explored based on its superior photo-thermal response. A stable all-opt...

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Section: Comparison Of Different 2d Materials‐based Similar Devicesmentioning

confidence: 99%

Boron Nanosheets for Efficient All‐Optical Modulation and Logic Operation

Guo

Shao

et al. 2019

Advanced Optical Materials

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“…Recently, 2D materials have triggered a large number of interest due to the striking physical properties related to the low dimensionality. [1][2][3] Graphene 1 in group-IV, borophene in group-III 4,5 and black phosphorous in group-V 6,7 have been extensively investigated experimentally and theoretically. However, researches related to group-VI monolayer materials are still lacking to date.…”

Section: Introductionmentioning

confidence: 99%

High Thermoelectric Performance in Two-Dimensional Tellurium: An Ab Initio Study

Gao

Liu

Ren

2018

ACS Appl. Mater. Interfaces

116

124

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In 2016, bulk tellurium was experimentally observed as a remarkable thermoelectric material. Recently, two-dimensional (2D) tellurium, called tellurene, has been synthesized and has exhibited unexpected electronic properties compared with the 2D MoS 2 . They have also been fabricated into air-stable and high efficient field-effect transistors. There are two stable 2D tellurene phases. One (β-Te) has been confirmed with an ultralow lattice thermal conductivity (κ L ). However, the study of the transport properties of the other more stable phase, α-Te, is still lacking. Here, we report the thermoelectric performance and phonon properties of α-Te using Boltzmann transport theory and first principle calculations. A maximum ZT value of 0.83 is achieved under reasonable hole concentration, suggesting that the monolayer α-Te is a potential competitor in the thermoelectric field.

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“…Borophene shows high in‐plane stiffness and off‐plane flexibility. Attributed to the strong B‐B bond, high atomic density, and unique phonon dispersion relationship, the thermal conductance of borophene and hydrogenated borophene (i.e., borophane) can be even higher than that of graphene . More interesting, based on first‐principles calculations, Li et al found that the experimentally fabricated borophene sheet can form stable nanotube structure after hydrogenation, denoted as H‐BNTs.…”

Section: Introductionmentioning

confidence: 99%

The Ultrahigh Quantum Thermal Conductance of Hydrogenated Boron Nanotubes

He¹,

Li²,

Yan³

et al. 2019

Physica Status Solidi (b)

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Using first‐principles calculations and phonon dispersion analysis, the authors demonstrate theoretically that a hydrogenated monolayer borophene sheet can form a stable nanotube structure, denoted as H‐BNT. Combined with non‐equilibrium Green's function method, it is found that although thermal conductance of H‐BNT is lower than its carbon counterpart in the high‐temperature limit, at room temperature the phonon thermal conductance of H‐BNT is only slightly lower (2%) than carbon nanotube with the similar diameter. The high room temperature thermal conductance of boron nanotube is attributed to the light atomic mass of boron, strong interatomic force between boron atoms and high atomic density. Our studies shed light on the nature of quantum thermal transport in low‐dimensional materials, and can help in developing boron‐based nanoscale devices.

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Stretch‐Driven Increase in Ultrahigh Thermal Conductance of Hydrogenated Borophene and Dimensionality Crossover in Phonon Transmission

Cited by 86 publications

References 62 publications

Boron Nanosheets for Efficient All‐Optical Modulation and Logic Operation

Boron Nanosheets for Efficient All‐Optical Modulation and Logic Operation

High Thermoelectric Performance in Two-Dimensional Tellurium: An Ab Initio Study

The Ultrahigh Quantum Thermal Conductance of Hydrogenated Boron Nanotubes

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