Toward Exploring the Structure of Monolayer to Few-layer TaS2 by Efficient Ultrasound-free Exfoliation

Hu, Yiwei; Hao, Qiaoyan; Zhu, Baoyou; Li, Biao; Gao, Zhan; Wang, Yan; Tang, Kaibin

doi:10.1186/s11671-018-2439-z

“…Three main Raman features depicted at 239, 301 and 373 cm -1 from the bulk crystal were assigned to the E2g, E1g and A1g modes respectively. 29,42 More prominent peaks of the same modes and their 4 cm -1 redshifts were observed for the exfoliated nanosheets. The shift is attributed to the decrease of the interlayer van der Waals forces and due to the material's thickness reduction.…”

Section: Results (I) Synthesis and Characterization Of The Materialssupporting

confidence: 53%

Photocatalytic Activity of Twist-Angle Stacked 2D TaS2

Kovalska

¹

,

Roy

²

,

Antonatos

³

et al. 2021

Preprint

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The development of low-cost efficient photoelectrosensitive electrodes as an alternative to the expensive and complex rigid systems is yet in huge demand for advanced photoresponsive technology. Herein, the light-induced efficiency of electrochemically exfoliated TaS2 nanosheets for hydrogen generation catalysis and photodetectors has been demonstrated for the first time. The electrochemical exfoliation of TaS2 crystals toward a few-layer derivative has been pioneered in anhydrous tetrabutylammonium hexafluorophosphate in N, N-dimethylformamide. Comprehensive analysis of as-exfoliated TaS2 revealed the formation of nanoparticles and nanosheets with a lateral size of about several nanometers and micrometers, correspondingly. Observed mutual twisting of 2H-TaS2 flakes leads to the redistribution of charge density induced by interlayer interaction of the individual nanosheets. External light irradiation on the TaS2 surface influences its conductivity making the material feasible for photoelectrocatalysis and photodetection. The TaS2-based catalyst demonstrates high HER photoelectrocatalytic activity with the onset overpotential below 575 mV vs. RHE which can be lowered by thorough catalyst preparation. Finally, the TaS2-integrated photodetector in the acidic medium represents its broadband light sensing capability with the highest photoresponsivity (0.68 mA W-1 ) toward 420 nm light illumination. This finding will pave the way to a new realization of exfoliated twist-angle stacked TaS2 for photo-induced electrochemistry and sensing

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“…Figure 5b shows the Raman spectra of bulk and as-exfoliated TaS 2 samples. Three main Raman features depicted at 239, 301, and 373 cm −1 from the bulk crystal were assigned to the E 2g , E 1g , and A 1g modes, respectively 28,41 . More prominent peaks of the same modes and their 4 cm −1 redshifts were observed for the exfoliated nanosheets.…”

Section: Synthesis and Characterization Of The Materialsmentioning

confidence: 99%

“…Several methods have been demonstrated to produce layered TaS 2, such as chemical vapor deposition (CVD) 27 , mechanical cleavages 21 , intercalation 28 , ultrasonication [29][30][31] , or liquid-phase exfoliation 22 . However, the CVD method remains to be improved before it can be used to produce large-domain homogeneous TaS 2 films.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic activity of twist-angle stacked 2D TaS2

Kovalska

¹

,

Roy

²

,

Antonatos

³

et al. 2021

View full text Add to dashboard Cite

The low-cost, efficient photoelectrosensitive electrodes as an alternative to expensive and complex rigid systems are yet in demand for advanced photoresponsive technology. Here, the light-induced efficiency of electrochemically exfoliated TaS2 nanosheets for hydrogen generation catalysis and photodetectors was demonstrated. Mutual twisting of the exfoliated 2H-TaS2 flakes leads to the redistribution of charge density induced by interlayer interaction of the individual nanosheets. External light irradiation on the TaS2 surface influences its conductivity making the material feasible for photoelectrocatalysis and photodetection. The TaS2-based photoelectrocatalyst demonstrates high hydrogen evolution reaction (HER) activity with the onset overpotential below 575 mV vs. reversible hydrogen electrode (RHE). The TaS2-integrated photodetector in the acidic medium represents its broadband response with the highest photoresponsivity (0.62 mA W−1) toward 420 nm light illumination. This finding will pave the way to a new realization of exfoliated twist-angle stacked TaS2 for photo-induced electrochemistry and sensing.

show abstract

“…Figure 5 b shows the Raman spectra of bulk and asexfoliated TaS2 samples. Three main Raman features depicted at 239, 301 and 373 cm -1 from thebulk crystal were assigned to the E2g, E1g and A1g modes respectively 29,42. More prominent peaks of the same modes and their 4 cm -1 redshifts were observed for the exfoliated nanosheets.…”

mentioning

confidence: 88%

Photocatalytic Activity of Twist-Angle Stacked 2D TaS2

Kovalska¹,

Roy²,

Antonatos³

et al. 2021

Preprint

0

View full text Add to dashboard Cite

The development of low-cost efficient photoelectrosensitive electrodes as an alternative to the expensive and complex rigid systems is yet in huge demand for advanced photoresponsive technology. Herein, the light-induced efficiency of electrochemically exfoliated TaS2 nanosheets for hydrogen generation catalysis and photodetectors has been demonstrated for the first time. The electrochemical exfoliation of TaS2 crystals toward a few-layer derivative has been pioneered in anhydrous tetrabutylammonium hexafluorophosphate in N, N-dimethylformamide. Comprehensive analysis of as-exfoliated TaS2 revealed the formation of nanoparticles and nanosheets with a lateral size of about several nanometers and micrometers, correspondingly. Observed mutual twisting of 2H-TaS2 flakes leads to the redistribution of charge density induced by interlayer interaction of the individual nanosheets. External light irradiation on the TaS2 surface influences its conductivity making the material feasible for photoelectrocatalysis and photodetection. The TaS2-based catalyst demonstrates high HER photoelectrocatalytic activity with the onset overpotential below 575 mV vs. RHE which can be lowered by thorough catalyst preparation. Finally, the TaS2-integrated photodetector in the acidic medium represents its broadband light sensing capability with the highest photoresponsivity (0.68 mA W-1 ) toward 420 nm light illumination. This finding will pave the way to a new realization of exfoliated twist-angle stacked TaS2 for photo-induced electrochemistry and sensing

show abstract

Toward Exploring the Structure of Monolayer to Few-layer TaS2 by Efficient Ultrasound-free Exfoliation

Cited by 13 publications

References 37 publications

Photocatalytic Activity of Twist-Angle Stacked 2D TaS2

Photocatalytic Activity of Twist-Angle Stacked 2D TaS2

Photocatalytic activity of twist-angle stacked 2D TaS2

Photocatalytic Activity of Twist-Angle Stacked 2D TaS2

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