Thermoelectric power and its correlation with conductivity in 
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 whiskers

Зыбцев, С. Г.; Pokrovskiǐ, V. Ya.; Nasretdinova, V. F.; Zaĭtsev-Zotov, S. V.; Pryadun, V.V.; Kozlyakova, Ekaterina S.; Волкова, О. С.; Vasiliev, A. N.; Pai, Woei Wu; Starešinić, Damir

doi:10.1103/physrevb.99.235155

Cited by 13 publications

(5 citation statements)

References 79 publications

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“…However, it has been recently shown that a metallic state is induced under pressure, 21 and thermoelectric power measurements suggest that NbS 3 -I is not a usual Peierls distorted system. 22 The existence of a second polymorph, NbS 3 -II, has also been known for a long time. 1 Although different superstructures of the basic NbS 3 -I structure were proposed for this polymorph, a clear-cut structural determination remained elusive until recently (Figure 1d).…”

Section: ■ Introductionmentioning

confidence: 99%

“…The observation of a semiconducting behavior, together with a doubling of the periodicity along the chain direction, where Nb–Nb short and long distances alternate, was considered as the result of a Peierls transition due to the occurrence of a formally half-filled band that opens a band gap at the Fermi level. However, it has been recently shown that a metallic state is induced under pressure, and thermoelectric power measurements suggest that NbS 3 -I is not a usual Peierls distorted system . The existence of a second polymorph, NbS 3 -II, has also been known for a long time .…”

Section: Introductionmentioning

confidence: 99%

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Rich Polymorphism of Layered NbS₃

et al. 2021

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Layered group V transition-metal trichalcogenides are paradigmatic low-dimensional materials providing an ever increasing series of unusual properties. They are all based on the same basic building units, one-dimensional MX 3 (M = Nb, Ta; X = S, Se) trigonal-prismatic chains that condense into layers, but their electronic structures exhibit significant differences leading to a broad spectrum of transport properties, ranging from metals with one, two, or three charge density wave instabilities to semimetals with potential topological properties or semiconductors. The different physical and chemical properties are shown to be related with subtle structural differences within the layers that result in half-, third-, or quarter-filled quasi-one-dimensional Nb d z 2 -type bands, providing a clear-cut illustration of the intimate link between structural and electronic features within a family of solids. An interesting yet not sufficiently explored feature of these solids is the polymorphism. Based on both experimental and new theoretical results, we examine this aspect for NbS 3 and show that at least seven different polymorphs with a stability compatible with the presently known phases of this compound are possible. We discuss a simple rationale for the physical properties of the presently known polymorphs as well as predictions for those that have still not been characterized or prepared. It is argued that some of the presently unknown polymorphs may have been prepared in an uncontrolled way as mixtures of different phases which could not be structurally characterized. The rich landscape of structures and properties found for this van der Waals material is suggested to represent an ideal platform for the preparation of flakes with finetuned properties for applications in new electronic and optoelectronic devices.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Rich Polymorphism of Layered NbS₃

et al. 2021

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“…The maximum resistivity occurs at around ∼60 K, followed by an abrupt drop (Figure h). Compared with the transport properties of the endmembers at room temperature, the electrical resistivity of (NbTaTi) 0.33 S 3 (∼1.7 Ω·cm) is close to that of TiS 3 with ρ (300 K) ∼ 2 Ω·cm. , The room-temperature resistivity of TaS 3 is at least 3 orders of magnitude smaller, and that of NbS 3 varies by the polymorphs. , The anomaly observed in the resistivity of (NbTaTi) 0.33 S 3 is attributed to distinct phase transitions associated with the CDW state. The phase transition temperatures are determined as the local maximum in the temperature-dependent logarithmic derivative of the resistance plot, , which are around 44 and 102 K, respectively (inset of Figure h).…”

Section: Resultsmentioning

confidence: 84%

“…13,53 The room-temperature resistivity of TaS 3 is at least 3 orders of magnitude smaller, 54 and that of NbS 3 varies by the polymorphs. 55,56 The anomaly observed in the resistivity of (NbTaTi) 0.33 S 3 is attributed to distinct phase transitions associated with the CDW state. The phase transition temperatures are determined as the local maximum in the temperature-dependent logarithmic derivative of the resistance plot, 57,58 which are around 44 and 102 K, respectively (inset of Figure 8h).…”

Section: Resultsmentioning

confidence: 97%

Thermodynamics and Kinetics in Anisotropic Growth of One-Dimensional Midentropy Nanoribbons

et al. 2023

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One-dimensional (1D) materials demonstrate anisotropic in-plane physical properties that enable a wide range of functionalities in electronics, photonics, valleytronics, optoelectronics, and catalysis. Here, we undertake an in-depth study of the growth mechanism for equimolar midentropy alloy of (NbTaTi)0.33S3 nanoribbons as a model system for 1D transition metal trichalcogenide structures. To understand the thermodynamic and kinetic effects in the growth process, the energetically preferred phases at different synthesis temperatures and times are investigated, and the phase evolution is inspected at a sequence of growth steps. It is uncovered that the dynamics of the growth process occurs at four different stages via preferential incorporation of chemical species at high-surface-energy facets. Also, a sequence of temperature and time dependent nonuniform to uniform phase evolutions has emerged in the composition and structure of (NbTaTi)0.33S3 which is described based on an anisotropic vapor–solid (V–S) mechanism. Furthermore, direct evidence for the 3D structure of the charge density wave (CDW) phase (width less than 100 nm) is provided by three-dimensional electron diffraction (3DED) in individual nanoribbons at cryogenic temperature, and detailed comparisons are made between the phases obtained before and after CDW transformation. This study provides important fundamental information for the design and synthesis of future 1D alloy structures.

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“…[ 14,46,47 ] For NbS 3 and TaS 3 nanofiber, the anomalies in resistivity were observed at ≈150, ≈70, and 210 K, respectively. [ 46,58,59 ] Moreover, the sheet resistances of these thin films are measured and after 40 days, the sheet resistance of Nb 0.5 Ta 0.5 S 3 only increases ≈40% and remains in the same range even after 60 days, but for NbS 3 and TaS 3 , the sheet resistance has been increased to five times and three orders of magnitude larger than the initial values, respectively (Figure S14, Supporting Information). Relative to the only reported number in literature for Ti 3 C 2 T z (2100% change over 40 days), as a common member of MXene family, [ 60,61 ] Nb 0.5 Ta 0.5 S 3 shows negligible sheet resistance change over time.…”

Section: Resultsmentioning

confidence: 99%

Unprecedented Multifunctionality in 1D Nb_1‐_xTa_xS₃ Transition Metal Trichalcogenide Alloy

Hemmat

Ahmadiparidari

Wang

et al. 2022

Adv Funct Materials

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1D materials, such as nanofibers or nanoribbons are considered as the future ultimate limit of downscaling for modern electrical and electrochemical devices. Here, for the first time, nanofibers of a solid solution transition metal trichalcogenide (TMTC), Nb1‐xTaxS3, are successfully synthesized with outstanding electrical, thermal, and electrochemical characteristics rivaling the performance of the‐state‐of‐the art materials for each application. This material shows nearly unchanged sheet resistance (≈740 Ω sq−1) versus bending cycles tested up to 90 cycles, stable sheet resistance in ambient conditions tested up to 60 days, remarkably high electrical breakdown current density of ≈30 MA cm−2, strong evidence of successive charge density wave transitions, and outstanding thermal stability up to ≈800 K. Additionally, this material demonstrates excellent activity and selectivity for CO2 conversion to CO reaching ≈350 mA cm−2 at −0.8 V versus RHE with a turnover frequency number of 25. It also exhibits an excellent performance in a high‐rate Li–air battery with the specific capacity of 3000 mAh g−1 at a current density of 0.3 mA cm−2. This study uncovers the multifunctionality in 1D TMTC alloys for a wide range of applications and opens a new direction for the design of the next generation low‐dimensional materials.

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Thermoelectric power and its correlation with conductivity in NbS3 whiskers

Cited by 13 publications

References 79 publications

Rich Polymorphism of Layered NbS₃

Rich Polymorphism of Layered NbS₃

Thermodynamics and Kinetics in Anisotropic Growth of One-Dimensional Midentropy Nanoribbons

Unprecedented Multifunctionality in 1D Nb_1‐_xTa_xS₃ Transition Metal Trichalcogenide Alloy

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Thermoelectric power and its correlation with conductivity in NbS3 whiskers

Cited by 13 publications

References 79 publications

Rich Polymorphism of Layered NbS3

Rich Polymorphism of Layered NbS3

Thermodynamics and Kinetics in Anisotropic Growth of One-Dimensional Midentropy Nanoribbons

Unprecedented Multifunctionality in 1D Nb1‐xTaxS3 Transition Metal Trichalcogenide Alloy

Contact Info

Product

Resources

About

Rich Polymorphism of Layered NbS₃

Rich Polymorphism of Layered NbS₃

Unprecedented Multifunctionality in 1D Nb_1‐_xTa_xS₃ Transition Metal Trichalcogenide Alloy