Size-tunable photoluminescence from <i>WS</i> <sub>2</sub> nanostructures

Sharma, Satinder K.; Singh, Jasvir; Bhagat, Shubham; Singh, Mandeep; Sharma, Sandeep

doi:10.1088/2053-1591/aabdcd

Cited by 11 publications

(7 citation statements)

References 43 publications

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“…However, when the size of MoS 2 is reduced to a few nanometers, the previously mentioned excitonic bands disappear and the band edges shift towards the high-energy spectral region. The band gap measured from optical absorption spectra was found to be in agreement with the value calculated from the effective-mass approximation model [56].…”

Section: Quantum Confinement In Optical Absorptionsupporting

confidence: 78%

“…They concluded that confinement of carriers in QDs in the lateral (in-plane) direaction leads to energy shifts that are significantly larger than those resulting from confinement in the perpendicular direction to the layers [49]. On the basis of the effective mass approximation and the assumption that the QD is spherical, the dependence of the QD band gap E on the QD radius R can be qualitatively described by the following equation [54][55][56]:…”

Section: Quantum Confinement In Optical Absorptionmentioning

confidence: 99%

“…Figure 4 illustrates the typical excitation--wavelength-dependent PL for MoS 2 QDs [50]. One common explanation of the excitation-wavelengthdependent PL is the existence of polydisperse QDs [55][56][57].…”

Section: Excitation-wavelength-dependent Photoluminescencementioning

confidence: 99%

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Quantum dots derived from two-dimensional transition metal dichalcogenides: synthesis, optical properties and optoelectronic applications

Chiu,

Chen,

Shen

2023

Nanotechnology

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Zero-dimensional transition metal dichalcogenides (TMD) quantum dots (QDs) have attracted a lot of attention due to their interesting fundamental properties and various applications. Compared to TMD monolayers, the QD counterpart exhibits larger values for direct transition energies, exciton binding energies, absorption coefficient, luminescence efficiency, and specific surface area. These characteristics make them useful in optoelectronic devices. In this review, recent exciting progress on synthesis, optical properties, and applications of TMD QDs is highlighted. The first part of this article begins with a brief description of the synthesis approaches, which focus on microwave-assistant heating and pulsed laser ablation methods. The second part introduces the fundamental optical properties of TMD QDs, including quantum confinement in optical absorption, excitation-wavelength-dependent photoluminescence, and many-body effects. These properties are highlighted. In the third part, we discuss lastest advancements in optoelectronic devices based on TMD QDs These devices include light-emitting diodes, solar cells, photodetectors, optical sensors, and light-controlled memory devices. Finally, a brief summary and outlook will be provided.

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Section: Quantum Confinement In Optical Absorptionsupporting

confidence: 78%

Section: Quantum Confinement In Optical Absorptionmentioning

confidence: 99%

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Quantum dots derived from two-dimensional transition metal dichalcogenides: synthesis, optical properties and optoelectronic applications

Chiu,

Chen,

Shen

2023

Nanotechnology

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“…On the other hand, the emission spectra in (c) and (d) does not display any such change and various emission peaks reflects the intrinsic feature from TiS 2 . A wide emission spectra might arise due to poly-dispersity of the obtained nanostructures and/or presence of defects in obtained scaled nanostructures [40]. Therefore, the data indicates that suspension obtained in DMF and NMP are stable as compared with others.…”

Section: Resultsmentioning

confidence: 85%

“…This broad absorption corresponds to bulk TiS 2 [39]. Therefore, [40]. In short, the parameters such as surface tension and relative permittivity etc.…”

Section: Resultsmentioning

confidence: 99%

Structural transformation and room temperature ammonia sensing properties of TiS2 nanostructures

Sharma

Singh

et al. 2020

SN Appl. Sci.

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The nanostructures of TiS 2 have been successfully synthesized in a single-step process using probe sonication in various liquid media. Initial visual inspection confirmed that the nanostructures prepared in de-ionized water and de-ionized water-ethanol mixture change color from black to white with time. Various structural, optical and vibrational measurements identified these changes due to structural transformation of TiS 2 into TiO 2 in presence of water molecules. However, this transformation was absent in TiS 2 nanostructures prepared in media like di-methyle formamide and N-methyle pyrolidone. These nanostructures were used for making two terminal sensor devices and yielded entirely different results. The black colored TiS 2 showed highly selective n-type behaviour towards ammonia (200 ppm) with nearly 72% relative response at room temperature. Corresponding rise time and recovery time were found to be 72 ± 7 s and 165 ± 10 s, respectively. Contrary to this, the other device made from white powder did not show a detectable change in base resistance of the sensor. These initial results indicate the potential use of stable TiS 2 nanostructures as a highly selective and sensitive room temperature ammonia sensor.

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Transition metal dichalcogenide quantum dots: Synthesis, properties, and applications for electrochemistry, energy storage, and solar cells

Lee,

Yang,

Shin

2024

Bulletin Korean Chem Soc

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Atomically thick two‐dimensional transition metal dichalcogenides (TMDs) have been extensively studied as optoelectronic materials because of their distinctive electronic structures and outstanding photonic and catalytic properties. In particular, when the size of TMDs are decreased to the quantum scale, they possess wider bandgaps and higher surface‐to‐volume ratios with more active edge sites per unit mass. Hence, they are promising for use in sensor, battery, and electrocatalytic applications. In this study, we briefly review the various popular synthesis methods of TMD quantum dots (QDs) from top‐down and bottom‐up approaches. Then, we summarize the optical, electronic, and catalytic properties of TMD QDs. Furthermore, recent progress on electrochemistry, energy storage, and solar cell applications of TMD QDs is summarized in detail. Finally, we summarize current research bottlenecks of TMD QDs and discuss potential avenues for future research.

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Size-tunable photoluminescence from WS ₂ nanostructures

Cited by 11 publications

References 43 publications

Quantum dots derived from two-dimensional transition metal dichalcogenides: synthesis, optical properties and optoelectronic applications

Quantum dots derived from two-dimensional transition metal dichalcogenides: synthesis, optical properties and optoelectronic applications

Structural transformation and room temperature ammonia sensing properties of TiS2 nanostructures

Transition metal dichalcogenide quantum dots: Synthesis, properties, and applications for electrochemistry, energy storage, and solar cells

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Size-tunable photoluminescence from WS 2 nanostructures

Cited by 11 publications

References 43 publications

Quantum dots derived from two-dimensional transition metal dichalcogenides: synthesis, optical properties and optoelectronic applications

Quantum dots derived from two-dimensional transition metal dichalcogenides: synthesis, optical properties and optoelectronic applications

Structural transformation and room temperature ammonia sensing properties of TiS2 nanostructures

Transition metal dichalcogenide quantum dots: Synthesis, properties, and applications for electrochemistry, energy storage, and solar cells

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Size-tunable photoluminescence from WS ₂ nanostructures