Large-size niobium disulfide nanoflakes down to bilayers grown by sulfurization

Li, Zhen; Yang, Wencao; Losovyj, Yaroslav; Xu, Enzhi; Liu, Haoming; Werbianskyj, Madilynn; Fertig, H. A.; Ye, Xingchen; Zhang, Shixiong

doi:10.1007/s12274-018-2111-z

Cited by 21 publications

(20 citation statements)

References 66 publications

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“…Up to now, various forms of low dimensional NbS 2 , such as nanowires, nanoribbons, nanoflakes, nanobelt arrays, and platelets, have been successfully synthesized by using physical or chemical techniques . However, synthesizing NbS 2 thin films is much more challenging.…”

Section: Resultsmentioning

confidence: 99%

Optical Properties of 2D 3R Phase Niobium Disulfide and Its Applications as a Saturable Absorber

Sun

Shi

Wang

et al. 2019

Advanced Optical Materials

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2D van der Waals metal 3R phase niobium disulfide (3R‐NbS2) has fascinating anisotropic, magnetic, optical, and superconducting properties. Herein, few‐layered 2D 3R‐NbS2 nanosheets are fabricated by combining liquid phase exfoliation and spin‐coating methods. The first principles calculations are performed to explore their electronic band structures to reveal the metallic properties and enhanced optical absorption as thickness increased. The linear and nonlinear optical properties arising from the plasmonic effects and nonequilibrium electrons are studied through the violet–visible–near‐infrared absorption spectroscopy, polarization‐resolved optical microscopy, and open‐aperture Z‐scan methods. The nonlinear absorption coefficient and imaginary part of the third‐order susceptibility are determined to be −2.5 × 106 cm GW−1 and −2.4 × 10−6 esu at 1064 nm. Furthermore, 2D 3R‐NbS2 nanosheets based saturable absorbers are fabricated and applied in solid‐state pulsed lasers, in which a continuous‐wave mode‐locking laser operation at 1050.6 nm is demonstrated with a pulse duration of 302 fs. The results not only verify that 2D metallic materials, such as 3R‐NbS2, are excellent nonlinear optical modulators, but also will arouse a general interest in designing novel materials/structures with 2D metallic materials for electronic and photonic devices.

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Section: Resultsmentioning

confidence: 99%

Optical Properties of 2D 3R Phase Niobium Disulfide and Its Applications as a Saturable Absorber

Sun

Shi

Wang

et al. 2019

Advanced Optical Materials

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“…SEM images of the pristine NbS 2 flakes show that the individual flake having a thickness of the range (40‐50 nm) and a diameter of ≈350 nm (Figure 2A‐C). Recently, large NbS 2 nanoflakes either standing or lying with respect to the sapphire substrate synthesized by the laser deposition method has been already reported 25 . The elemental mapping of the pristine and treated samples was done by SEM which is represented in Figure S1 (Supplementary information [S.I]).…”

Section: Resultsmentioning

confidence: 99%

“…Recently, large NbS 2 nanoflakes either standing or lying with respect to the sapphire substrate synthesized by the laser deposition method has been already reported. 25 The elemental mapping of the pristine and treated samples was done by SEM which is represented in Figure S1 (Supplementary information [S.I]). In contrast after postthermal annealing, NbS 2 flakes become much thinner (≈30-40 nm) and larger in lateral size (1 μm) as shown in Figure 2D-F and Figure S2(b), (e) and (f).…”

Section: Electrochemical Testsmentioning

confidence: 99%

Unveiling active sites by structural tailoring of two‐dimensional niobium disulfide for improved electrocatalytic hydrogen evolution reaction

et al. 2020

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Here we report, unveiling the active sites for improved electrocatalytic hydrogen evolution reaction (HER) by structural tailoring of Niobium Disulfide (NbS 2). NbS 2 synthesized by chemical vapor deposition method, structural deformation is carried out by post-argon plasma and annealing treatment. Plasma-treated (P.T) NbS 2 exhibits layer-by-layer stacked (≈250 nm) long and (≈200 nm) wide flakes, which show more edge sites and demonstrates low hydrogen evolution activity. Annealed NbS 2 flakes are enlarged in size (≈1 μm) having more surface area which shows additional active basal plane sites and demonstrate remarkable HER performance at 10 mA cm −2. As the thickness of NbS 2 is reduced, more basal planes are exposed hence improved HER activity was achieved. This enhanced electrocatalytic change demonstrates that the basal planes are the main active sites for HER in NbS.

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“…Graphene-like materials h-BN [100] (very stable) Silicene [105,108] (monolayer: few minutes; multilayer: 2 days) TMDCs MoS 2 [93] (few months) WS 2 [109] (few months) WSe 2 [94] (few months) MoSe 2 [97] (≈9 days) MoTe 2 [97,101] (≈1 day) WTe 2 [110] (few days) NbS 2 [95] (few days) VSe 2 [96] (≈1 day) HfS 2 [97] (few days) HfSe 2 [97] (≈1 day) NbSe 2 [106,111] (few hours) BP or BP-like materials BP [98,99] (few hours)…”

Section: Less Stable Unstablementioning

confidence: 99%

“…Considering the difficulty of providing a general outline and the need for simplification, we have summarized the chemical stability of 2D materials beyond graphene under ambient conditions as well as their expected lifetimes in Table 2 . [ 93–107 ] This table shows that h‐BN and some TMDCs such as MoS 2 are chemically stable, since they remain intact for several weeks to several months under ambient conditions, while other TMDCs such as MoTe 2 are less stable, which slowly react with oxygen or water, and only remain intact for several days. Finally, BP, silicene, and CrI 3 are typical unstable 2D materials that degrade within several minutes to several hours upon exposure to ambient conditions.…”

Section: Fundamental Properties Of 2d Materials Beyond Graphenementioning

confidence: 99%

Bioelectronics‐Related 2D Materials Beyond Graphene: Fundamentals, Properties, and Applications

Wang

Sun

Ding

et al. 2020

Adv Funct Materials

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The rapid development of bioelectronics has lead to the emergence of versatile biorelated architectures for information processing systems, sensors, actuators, and wearable devices. In recent years, 2D materials beyond graphene have been demonstrated to be essential bioelectronic device components owing to their merits of atomic thickness, high transparency, large specific area, unique electrical/optical properties, and good biocompatibility. Herein, the recent advances in the bioelectronic applications of 2D materials beyond graphene are reviewed and their physicochemical properties, biocompatibility, synthesis, and processing methods are described. Moreover, the design strategies, working mechanisms, and performances of various bioelectronic devices based on these materials are summarized and the perspectives and challenges of this research field are highlighted. Thus, this review is expected to inspire new insights and technical advances for future research.

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Large-size niobium disulfide nanoflakes down to bilayers grown by sulfurization

Cited by 21 publications

References 66 publications

Optical Properties of 2D 3R Phase Niobium Disulfide and Its Applications as a Saturable Absorber

Optical Properties of 2D 3R Phase Niobium Disulfide and Its Applications as a Saturable Absorber

Unveiling active sites by structural tailoring of two‐dimensional niobium disulfide for improved electrocatalytic hydrogen evolution reaction

Bioelectronics‐Related 2D Materials Beyond Graphene: Fundamentals, Properties, and Applications

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