Tailored MoS<sub>2</sub>nanorods: a simple microwave assisted synthesis

Reshmi, S.; Akshaya, M V; Satpati, Biswarup; Roy, Anupam; Basu, Palash Kumar; Bhattacharjee, A. K.

doi:10.1088/2053-1591/aa949c

Cited by 26 publications

(24 citation statements)

References 79 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Consistent with a previous report by Wang et al on WS 2 nanotubes, after laser treatment, the E 2G peak was observed at 351 cm −1 , a softening of the band that is attributable to the increase in lateral size. In contrast, a stiffening of the A 1G mode was observed (peak shifted to 418.5 cm −1 ), consistent with previous reports and indicative of increased thickness, which may be due to the agglomeration of the rods and their attachment through weak van der Waal forces when drop cast for analysis. The A 1G phonon peak involves sulfuric out‐of‐plane vibration and hence increasing the number of layers limits the movement in that direction.…”

Section: Resultssupporting

confidence: 91%

Laser‐Directed Assembly of Nanorods of 2D Materials

Ibrahim

Novodchuk

Mistry

et al. 2019

Small

View full text Add to dashboard Cite

transparency thus connected networks of 1D nanomaterials [5] have been studied as a viable alternative to thin films of indium tin oxide, which suffer from drawbacks such as brittleness and indium scarcity. [6] Materials such as graphene and transition metal dichalcogenides (TMDs) exhibit excellent electrical properties due to their "flat" 2D chemical structure. Sheets or flakes of these materials can allow for large area coverage with high conductivity but typically at the expense of transparency. [7,8] An approach to improving transparency is utilizing these materials in 1D nanorod-like structures. Carbon nanotubes (CNTs) are the most popular 1D variant of graphene and have been utilized to form large area conducting films, although challenges remain with respect to their purification [9,10] and aggregation. [5] As an alternative to CNTs, the synthesis of carbon-based nanorods has been reported by utilizing arc discharge [11] and microwave plasma chemical vapor deposition (CVD) [12] methods. However, the arc discharge method requires an extensive filtering (Soxhlet extraction) and drying process, while the CVD method requires a high power and temperature (e.g., 850 °C). The growth of graphene nanoribbons has also been reported by ultrahigh vacuum thermal evaporation [13] and hydrothermal techniques, [14] yielding lengths of 20-450 nm and widths of 2-40 nm.In regards to TMDs, molybdenum disulfide (MoS 2 ) nanorods have been synthesized via a redox reaction in an aqueous solution (yielding a nanorod mixture of binary oxides (Mo x O y ) and binary sulfides (Mo x S y )), [15] hydrothermal synthesis, [16] and hydrothermal synthesis of MoO 3 nanorods combined with sulfurization. [17] Similar to MoS 2 , the synthesis of tungsten disulfide (WS 2 ) nanorods has been accomplished by lengthy hydrothermal [18,19] and sulfidation [20] methods. Zhang et al. used high energy ball milling of WS 2 powder for 122 h, after which the powder was used as a precursor in a hydrothermal reaction for nanorod growth. [21] Ball milling methods have also been used to produce boron nitride (BN) nanorods. Boron carbide powders were milled for 100 h and subsequently treated with nitrogen at high temperature to produce BN nanorods. [22][23][24] In another approach, Museur et al. synthesized BN nanorods embedded in amorphous boron suboxides (B x O y ) through UV laser irradiation of a compacted BN powder pellet in a high-pressure nitrogen environment. [25] Table 1 summarizes these previous efforts to fabricate nanorods of 2D materials. Many of these methods require Herein, the previously unrealized ability to grow nanorods and nanotubes of 2D materials using femtosecond laser irradiation is demonstrated. In as short as 20 min, nanorods of tungsten disulfide, molybdenum disulfide, graphene, and boron nitride are grown in solutions. The technique fragments nanoparticles of the 2D materials from bulk flakes and leverages molecular scale alignment by nonresonant intense laser pulses to direct their assembly into nanorods up to several micrometers i...

show abstract

Section: Resultssupporting

confidence: 91%

Laser‐Directed Assembly of Nanorods of 2D Materials

Ibrahim

Novodchuk

Mistry

et al. 2019

Small

View full text Add to dashboard Cite

show abstract

“…The observation of a similar difference of 26 cm –1 between the E 2g 1 and A 1g modes originates from the local symmetry of the MoS 2 because the local symmetry mostly remains unaltered even after the formation of QDs. 27 …”

Section: Resultsmentioning

confidence: 99%

Excitons and Trions in MoS₂ Quantum Dots: The Influence of the Dispersing Medium

Thomas

Jinesh

2022

ACS Omega

View full text Add to dashboard Cite

Single-layer MoS 2 has been reported to exhibit strong excitonic and trionic signatures in its photoluminescence (PL) spectra. Here, we report that the emission spectra of MoS 2 QDs strongly depend on the dielectric constant of the solvent and the relative difference in the electronegativity between the solvent and QDs. Due to the difference in electronegativity, electrons are either added to the QD or withdrawn from it. Consequently, depending upon the dielectric permittivity and the electronegativity of the surrounding medium, the signature peaks of excitons and trions exhibit a significant change in the PL spectra of MoS 2 QDs. Our findings are helpful to understand the effect of the surrounding environment on the optical properties of QDs and the importance of the selection of solvent since MoS 2 QDs are potential candidates for valleytronics applications.

show abstract

“…Metallic contents increased according to the rotational speeds as follows: 17, 34, 88, and 92% for 500, 1000, 2000, and 3000 rpm, respectively. The obtained 1T yield is superior to, or comparable with, those of other previous methods, including chemical exfoliation intercalation, ball-milling, supercritical CO 2 -assisted exfoliation, electrochemical intercalation, chemical bending strain, and microwave-assisted exfoliation. ,− ,− Therefore, the hydraulic power-manufacturing process is a straightforward, fast, and scalable option for 1T high-percentage MoS 2 nanosheets.…”

Section: Results and Discussionmentioning

confidence: 70%

“…The high performance of P-1T-MoS 2 makes it suitable for negative electrodes for asymmetric supercapacitors (ASC) in combination with a positive electrode of carbon-based materials (Figure a). To this end, we fabricated an asymmetric supercapacitor cell by assembling P-1T-MoS 2 as a negative electrode and ionic liquid-functionalized graphene (IL-G) previously reported by our group as a positive electrode (Figure b) Figure c shows CVs of the cell with a stable cell voltage of 1.6 V measured at scan rates in the 2–500 mV s –1 range.…”

Section: Results and Discussionmentioning

confidence: 99%

“…Two-dimensional (2D) nanosheets with extraordinary properties are a key component of active electrode materials for development of energy conversion and storage. − Recently, molybdenum disulfide (MoS 2 ) has received renewed attention because of phase control of 2H (hexagonal phase)-MoS 2 to 1T (distorted tetragonal phase)-MoS 2 . − Compared to 2H-MoS 2 , which is naturally abundant and stable, 1T-MoS 2 is synthesized and metastable but has 10 7 times higher electronic conductivity, more abundant active sites (opening the basal plane), and larger layer spacing. ,− These features make 1T-MoS 2 significantly more effective for energy storage and catalytic hydrogen evolution. ,,− The metallic-phase MoS 2 materials have typically been prepared by a variety of strategies involving chemical (or electrochemical) exfoliation, , supercritical CO 2 -assisted exfoliation, microwave-assisted exfoliation, strain controlling, electron injection, and hydrothermal synthesis . Nevertheless, previous work has identified two issues as challenges: (1) a high-throughput process must be developed for 1T-MoS 2 with a high-density metallic phase for many electrochemical applications that require large quantities in electrode preparation and (2) stability of the 1T phase should be enhanced because metastable 1T-MoS 2 tends to aggregate and then reverts to the 2H phase with time, heat, and electrochemical reactions.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fluid Dynamics-Induced Surface Engineering for Holey and Stable Metallic MoS₂ Nanosheets with High Pseudocapacitance and Ultrafast Rate Capability

Jeong

Park

et al. 2020

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

Two-dimensional molybdenum disulfide (MoS2) nanosheets have attracted great attention for electrochemical storage and conversion, but the scalable preparation of highly conductive and stable MoS2 nanosheets with a porous structure is challenging. Here, an efficient and high-throughput fluid dynamics process is presented for high-yield exfoliation of MoS2 with a phase transformation of 2H into 1T phase and basal activation of MoS2, resulting in ultrathin nanoporous nanosheets of MoS2 with a high-content 1T phase. The metallic and tailored porous structure in holey MoS2 nanosheets ensures a large ion-accessible area and rapid and efficient charge transport properties. The resulting MoS2 electrodes show an outstanding gravimetric capacitance of 572.6 F g–1 at 2 mV s–1, an impressive high capacitance retention of 71% measured in the 2–1000 mV s–1 range, and a good long-term stability with a capacitance retention of 96% over 10,000 cycles.

show abstract

Tailored MoS₂nanorods: a simple microwave assisted synthesis

Cited by 26 publications

References 79 publications

Laser‐Directed Assembly of Nanorods of 2D Materials

Laser‐Directed Assembly of Nanorods of 2D Materials

Excitons and Trions in MoS₂ Quantum Dots: The Influence of the Dispersing Medium

Fluid Dynamics-Induced Surface Engineering for Holey and Stable Metallic MoS₂ Nanosheets with High Pseudocapacitance and Ultrafast Rate Capability

Contact Info

Product

Resources

About

Tailored MoS2nanorods: a simple microwave assisted synthesis

Cited by 26 publications

References 79 publications

Laser‐Directed Assembly of Nanorods of 2D Materials

Laser‐Directed Assembly of Nanorods of 2D Materials

Excitons and Trions in MoS2 Quantum Dots: The Influence of the Dispersing Medium

Fluid Dynamics-Induced Surface Engineering for Holey and Stable Metallic MoS2 Nanosheets with High Pseudocapacitance and Ultrafast Rate Capability

Contact Info

Product

Resources

About

Tailored MoS₂nanorods: a simple microwave assisted synthesis

Excitons and Trions in MoS₂ Quantum Dots: The Influence of the Dispersing Medium

Fluid Dynamics-Induced Surface Engineering for Holey and Stable Metallic MoS₂ Nanosheets with High Pseudocapacitance and Ultrafast Rate Capability