Influence of graphene oxide nanosheets and multi-walled carbon nanotubes on the thermoelectric and mechanical properties of Mg2(Si0.3Sn0.7)0.99Sb0.01

Huang, Heming; Wen, Pin; Bi, Taijun; Duan, Bo; Zhou, Xilong; Yao, Li; Zhai, Pengcheng

doi:10.1016/j.scriptamat.2021.114103

Cited by 10 publications

(8 citation statements)

References 32 publications

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“…Notably, these values of toughness are much higher than that of reported pristine BiCuSeO, [39] and even beyond those of abundant intermetallic and oxide thermoelectric materials. [40][41][42][43] This achievement benefits from the effect of the van der Waals forces in the SWCNTs composited, [44,45] suggesting that the SWCNTs can improve the mechanical properties as well as the thermoelectric performance.…”

Section: Resultsmentioning

confidence: 99%

Superior Carrier Mobility Enabled by the Charge Channel Leads to Enhanced Thermoelectric Performance in BiCuSeO Composites

Yin,

Zhang,

Wang

et al. 2023

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BiCuSeO oxyselenides possess a highlighted thermoelectric performance among oxides, which originates from their intrinsically low thermal conductivity. However, intrinsic factors causing low thermal transport are also detrimental to carrier transport, leading to ultralow carrier mobility and relatively low electrical transport properties. Here, high‐conductivity single‐wall carbon nanotubes (SWCNTs) are adopted as the charge channels to be embedded in a BiCuSeO‐based matrix, providing a transport pathway for charge carriers. The results show that carrier mobility is increased to 188 cm2 V−1 s−1 due to the SWCNTs composited, triggering an enhancement in electrical transport properties. Besides, the SWCNTs embedded in the matrix introduce abundant interfaces, suppressing phonon transport and depressing lattice thermal conductivity. With these achievements, a maximum zT of 0.84 at 818 K is realized in the composite with 0.1 wt% SWCNTs. The mechanical property of the composites is strengthened as well because of the SWCNTs. The work indicates that the SWCNTs, as the charge channels, propose an effective approach for enhancing carrier mobility in BiCuSeO‐based materials, finally optimizing the thermoelectric performance as well as the mechanical property.

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Section: Resultsmentioning

confidence: 99%

Superior Carrier Mobility Enabled by the Charge Channel Leads to Enhanced Thermoelectric Performance in BiCuSeO Composites

Yin,

Zhang,

Wang

et al. 2023

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“…It is indicated that the MnTe compound disperses the crack-tip stress and dissipates the energy of crack propagation, which has been well-witnessed in materials fortified via the introduction of secondary phases. [4,[51][52][53] Additionally, the yield strength of the composite material gradually rises as the dispersed particle size falls. [54] As shown in Figures 1e,f and Figure S2 (Supporting Information), a significant quantity of small-sized MnTe precipitates are randomly dispersed throughout the matrix of the x = 0.15 sample, resulting in an enhancement in yield strength when compared to the x = 0.10 sample.…”

Section: Precipitation Strengtheningmentioning

confidence: 99%

Optimization of Mechanical and Thermoelectric Properties of SnTe‐Based Semiconductors by Mn Alloying Modulated Precipitation Evolution

Yang,

Wu,

Feng

et al. 2024

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Multiscale defects engineering offers a promising strategy for synergistically enhancing the thermoelectric and mechanical properties of thermoelectric semiconductors. However, the specific impact of individual defects, in particular precipitation, on mechanical properties remains ambiguous. In this work, the mechanical and thermoelectric properties of Sn1.03−xMnxTe (x = 0–0.30) semiconductors are systematically studied. Mn‐alloying induces dense dislocations and Mn nano‐precipitates, resulting in an enhanced compressive strength with x increased to 0.15. Quantitative calculations are performed to assess the strengthening contributions including grain boundary, solid solution, dislocation, and precipitation strengthening. Due to the dominant contribution of precipitation strengthening, the yield strength of the x = 0.10 sample is improved by ≈74.5% in comparison to the Mn‐free Sn1.03Te. For x ≥ 0.15, numerous MnTe precipitates lead to a synergistic enhancement of strength‐ductility. In addition, multiscale defects induced by Mn alloying can scatter phonons over a wide frequency spectrum. The peak figure of merit ZT of ≈1.3 and an ultralow lattice thermal conductivity of ≈0.35 Wm−1 K−1 are obtained at 873 K for x = 0.10 and x = 0.30 samples respectively. This work reveals tha precipitation evolution optimizes the mechanical and thermoelectric properties of Sn1.03−xMnxTe semiconductors, which may hold potential implications for other thermoelectric systems.

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“…It has been found that the composite of nano-precipitates is an effective method to improve the mechanical properties of thermoelectric materials. Duan et al [ 67 ] dispersed 1.0 vol.% nano-TiN to CoSb 2.875 Te 0.125 and found that compared with the matrix materials, its flexural strength and fracture toughness increased by 31% and 40%, respectively, as shown in Figure 5 a. Huang et al [ 68 ] added graphene oxide nanosheets and multi-walled carbon nanotubes together to Mg 2 (Si 0.3 Sn 0.7 ) 0.99 Sb 0.01 to prepare a bulk composite thermoelectric material, which significantly improved the thermoelectric and mechanical properties of the matrix material. In addition, Figure 5 d reveals dislocations have a positive effect on ductility enhancement.…”

Section: Toughening Strategies Of Thermoelectric Materialsmentioning

confidence: 99%

“…( a ) Flexural strength and fracture toughness of CoSb 2.875 Te 0.125 + x vol.% TiN [ 67 ]; ( b ) SEM images of the sample with 1.0 vol.% TiN composites [ 67 ]; ( c ) Toughening by crack bridging, branching, and deflection (Reprinted with permission from ref [ 67 ]. Copyright 2012 Elsevier); ( d ) Mechanical and thermoelectric properties of Mg 2 (Si 0.3 Sn 0.7 ) 0.99 Sb 0.01 improved by graphene oxide nanosheets and multi-walled carbon nanotubes [ 68 ]; ( e , f ) Crack propagates: pulling out and crack bridging (Reprinted with permission from ref [ 68 ]. Copyright 2021 Elsevier); ( g ) Dense dislocations loops in SnTe [ 69 ]; ( h ) Stress-strain curves for compression tests of SnTe at different temperature [ 69 ]; ( i ) The deformation mechanisms in SnTe samples at different temperatures (Reprinted with permission from ref [ 69 ].…”

Section: Figurementioning

confidence: 99%

Toughening Thermoelectric Materials: From Mechanisms to Applications

Feng

Cao

et al. 2023

IJMS

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With the tendency of thermoelectric semiconductor devices towards miniaturization, integration, and flexibility, there is an urgent need to develop high-performance thermoelectric materials. Compared with the continuously enhanced thermoelectric properties of thermoelectric materials, the understanding of toughening mechanisms lags behind. Recent advances in thermoelectric materials with novel crystal structures show intrinsic ductility. In addition, some promising toughening strategies provide new opportunities for further improving the mechanical strength and ductility of thermoelectric materials. The synergistic mechanisms between microstructure-mechanical performances are expected to show a large set of potential applications in flexible thermoelectric devices. This review explores enlightening research into recent intrinsically ductile thermoelectric materials and promising toughening strategies of thermoelectric materials to elucidate their applications in the field of flexible thermoelectric devices.

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Influence of graphene oxide nanosheets and multi-walled carbon nanotubes on the thermoelectric and mechanical properties of Mg2(Si0.3Sn0.7)0.99Sb0.01

Cited by 10 publications

References 32 publications

Superior Carrier Mobility Enabled by the Charge Channel Leads to Enhanced Thermoelectric Performance in BiCuSeO Composites

Superior Carrier Mobility Enabled by the Charge Channel Leads to Enhanced Thermoelectric Performance in BiCuSeO Composites

Optimization of Mechanical and Thermoelectric Properties of SnTe‐Based Semiconductors by Mn Alloying Modulated Precipitation Evolution

Toughening Thermoelectric Materials: From Mechanisms to Applications

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