Controlled Doping of MS<sub>2</sub> (M=W, Mo) Nanotubes and Fullerene‐like Nanoparticles

Yadgarov, Lena; Rosentsveig, Rita; Leitus, Gregory; Albu‐Yaron, Ana; Moshkovich, A.; Perfilyev, V.; Vasić, Relja; Frenkel, Anatoly; Enyashin, A. N.; Seifert, Gotthard; Rapoport, L.; Tenne, Reshef

doi:10.1002/ange.201105324

Cited by 8 publications

(22 citation statements)

References 24 publications

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“…Another factor to note is the low concentration of dopant and its effect on the electronic properties and local strain at the dopant site of IF‐MoS 2 . The concentration of free charge carriers in the conduction band can be increased by Re‐ and Nb‐doping at 10–500 ppm (by 10 16 –10 17 cm −3 ) . As a result, the surface of IF‐ MoS 2 consists of n‐type or p‐type carriers, which improve the conductivity of pristine MoS 2 and reduces the charge‐transfer resistance in electron transfer reactions.…”

Section: Resultsmentioning

confidence: 99%

“…The subsequent conversion of the Nb–Mo oxide cake into the Nb‐doped IF‐MoS 2 nanoparticles (Nb:IF‐MoS 2 ) possesses some similarity to that of pure (undoped) IF‐MoS 2 NPs or Re:IF‐MoS 2 NPs. The synthesis of IF‐MoS 2 and Re‐doped IF‐MoS 2 has been previously reported …”

Section: Methodsmentioning

confidence: 99%

“…The concept of n‐type Re‐doping in IF‐MoS 2 and its achievement has already been reported . Niobium is located to the left of molybdenum in the periodic table and would therefore induce p‐type doping.…”

Section: Introductionmentioning

confidence: 99%

“…Unlike the case of rhenium‐doping of IF‐MoS 2 , Nb 2 O 5 is not volatile at the reactor temperatures of 800–900 °C needed to sulfidize the MoO 3 nanoparticles. Therefore, congruent evaporation of the minor phase (Nb 2 O 5 ), like in the case of ReMo, is not possible . A new strategy for the Nb‐doping of IF‐MoS 2 nanoparticles was therefore developed to ensure uniform doping density in the MoS 2 of nanoparticles through careful control of the reaction conditions.…”

Section: Introductionmentioning

confidence: 99%

“…[15] We found that Re-doping increased the free chargec arriers by 10 16 -10 17 cm À3 in the conduction band of MoS 2 .These free charge carriers lie close to the surface of MoS 2 fullerene( IF) and increaset he n-type character and electricalc onductivity. [19,20] However,t here is no systematic study regarding designingt he strategy to improvet he HER activity in both acidic and basic mediumb ased on the natureo f dopants. The presents tudy showsh ow the electrochemical activity can be tuned at different pH by introducingp -a nd ntype dopantsinI F-MoS 2 .…”

Section: Introductionmentioning

confidence: 99%

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Effects of p‐ and n‐type Doping in Inorganic Fullerene MoS₂ on the Hydrogen Evolution Reaction

et al. 2016

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In this report, a systematic study of the effects of p‐ and n‐type doping of the inorganic fullerene (IF) MoS2 on the efficiency of the hydrogen evolution reaction (HER) is described. Active edge site enriched IF‐MoS2, promoted by strategically introducing Nb (p‐type) and Re (n‐type) dopants (below 500 ppm), enables facile HER over a range of pH values. Experimental results suggest that although Nb‐doping on IF‐MoS2 leads to better electrocatalytic HER activity in an alkaline medium with an onset potential difference of 80 mV, Re‐doping gives excellent activity in an acidic medium. The present work presents a systematic study of HER activity by finely tuning the activity in different electrolyte media with varied pH values through deliberate doping of the parent catalyst with p‐ and n‐ type materials. The doped IF‐MoS2 catalysts exhibit excellent catalytic activity even with sea water as an electrolyte.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of p‐ and n‐type Doping in Inorganic Fullerene MoS₂ on the Hydrogen Evolution Reaction

et al. 2016

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Dynamical Nature of Exciton‐Polariton Coupling in WS₂ Nanoparticles

Sinha

Višić

Byregowda

et al. 2022

Israel Journal of Chemistry

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Semiconducting transition metal dichalcogenides can be synthesized in a wide range of structures and geometries, including closed cage nanostructures, such as nanotubes or fullerene‐like nanoparticles (NSs). The latter is especially intriguing due to the stability, enhanced light‐matter interactions, and ability to sustain exciton‐polaritons (EPs) in ambient conditions, i. e., strong coupling of excitonic resonances to the optical cavity. Here we investigate the dynamics of EPs formation in WS2 NPs in the time domain using femtosecond transient extinction spectroscopy. We develop a gamut of analytical methods and models with time‐dependent parameters to extract the underlying non‐equilibrium dynamics of EPs formation. We find that the formation of EPs in WS2 NPs is not instantaneous but a gradual process that occurs only after several picoseconds. Specifically, for the short delay times, the light‐matter interaction is guided by excitonic absorption, whereas for the long delay times, the process is controlled by polaritonic scattering. We discover that the coupling strength is a time‐dependent entity and not a constant as is usually defined. Namely, there is a nonlinear coupling between excitonic and external modes and a notable transition from weak to strong coupling limit. Our results show that the time‐dependent phenomenological dynamical model quantitatively reproduces the nonlinear dynamical coupling as well as the effects of the pump fluence on the coupling strength.

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Nanotube Electromechanics beyond Carbon: The Case of WS₂

et al. 2015

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The incorporation of nanostructures into nanoelectronic and nanoelectromechanical systems is a long sought-after goal. In the present article, we report the first torsional electromechanical measurements of pure inorganic nanotubes. The WS2 nanotubes exhibited a complex and reproducible electrical response to mechanical deformation. We combined these measurements with density-functional-tight-binding calculations to understand the interplay between mechanical deformation, specifically torsion and tension, and electrical properties of WS2 nanotubes. This yielded the understanding that the electrical response to mechanical deformation may span several orders of magnitude on one hand and detect several modes of mechanical deformation simultaneously on the other. These results demonstrate that inorganic nanotubes could thus be attractive building blocks for nanoelectromechanical systems such as highly sensitive nanometric motion sensors.

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Controlled Doping of MS₂ (M=W, Mo) Nanotubes and Fullerene‐like Nanoparticles

Cited by 8 publications

References 24 publications

Effects of p‐ and n‐type Doping in Inorganic Fullerene MoS₂ on the Hydrogen Evolution Reaction

Effects of p‐ and n‐type Doping in Inorganic Fullerene MoS₂ on the Hydrogen Evolution Reaction

Dynamical Nature of Exciton‐Polariton Coupling in WS₂ Nanoparticles

Nanotube Electromechanics beyond Carbon: The Case of WS₂

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Controlled Doping of MS2 (M=W, Mo) Nanotubes and Fullerene‐like Nanoparticles

Cited by 8 publications

References 24 publications

Effects of p‐ and n‐type Doping in Inorganic Fullerene MoS2 on the Hydrogen Evolution Reaction

Effects of p‐ and n‐type Doping in Inorganic Fullerene MoS2 on the Hydrogen Evolution Reaction

Dynamical Nature of Exciton‐Polariton Coupling in WS2 Nanoparticles

Nanotube Electromechanics beyond Carbon: The Case of WS2

Contact Info

Product

Resources

About

Controlled Doping of MS₂ (M=W, Mo) Nanotubes and Fullerene‐like Nanoparticles

Effects of p‐ and n‐type Doping in Inorganic Fullerene MoS₂ on the Hydrogen Evolution Reaction

Effects of p‐ and n‐type Doping in Inorganic Fullerene MoS₂ on the Hydrogen Evolution Reaction

Dynamical Nature of Exciton‐Polariton Coupling in WS₂ Nanoparticles

Nanotube Electromechanics beyond Carbon: The Case of WS₂