Modified top-down approach for synthesis of molybdenum oxide quantum dots: sonication induced chemical etching of thin films

Borah, Dibya Jyoti; Mostako, A.T.T.; Borgogoi, Angshuman Thunder; Saikia, Prasanta Kumar; Malakar, Ashim

doi:10.1039/c9ra09773b

Cited by 21 publications

(9 citation statements)

References 80 publications

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“…Such a complex structure leads to a great variety of phonon modes in the mid-to far-IR as depicted by the nearly coincident Raman spectra of the bulk crystal and nanobelts in Figure 1e. The peaks at 994, 814, 663, 473, 373, 332, and 286 cm -1 are assigned to vibrational modes of the orthorhombic α-MoO3 phase [43,44], [18] . The 286 cm -1 peak is attributed to O=Mo=O wagging vibrations.…”

Section: Resultsmentioning

confidence: 99%

Ultrabroadband Nanocavity of Hyperbolic Phonon–Polaritons in 1D-Like α-MoO₃

et al. 2021

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The exploitation of phonon-polaritons in nanostructured materials offers a pathway to manipulate infrared (IR) light for nanophotonic applications. Notably, hyperbolic phonons polaritons (HP 2 ) in polar bidimensional crystals have been used to demonstrate strong electromagnetic field confinement, ultraslow group velocities, and long lifetimes (~ up to 8 ps). Here we present nanobelts of α-phase molybdenum trioxide (α-MoO3) as a low-dimensional medium supporting HP 2 modes in the mid-and far-IR ranges. By real-space nanoimaging, with IR illuminations provided by synchrotron and tunable lasers, we observe that such HP 2 response happens via formation of Fabry-Perot resonances. We remark an anisotropic propagation which critically depends on the frequency range. Our findings are supported by the convergence of experiment, theory, and numerical simulations. Our work shows that the low dimensionality of natural nanostructured crystals, like α-MoO3 nanobelts, provides an attractive platform to study polaritonic light-matter interactions and offer appealing cavity properties that could be harnessed in future designs of compact nanophotonic devices.

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Section: Resultsmentioning

confidence: 99%

Ultrabroadband Nanocavity of Hyperbolic Phonon–Polaritons in 1D-Like α-MoO₃

et al. 2021

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“…[99] Thus, greener fabrication strategies for QDs production will be greatly appreciated, enhancing the production and application of semiconducting QDs. In 2020, Borah et al [100] employed chemical etching treatment by adding HCl in the system to synthesize MoO x (x = 2, 3) QDs. The average size of spherical MoO x is ≈4.5 nm.…”

Section: Top-down Methodsmentioning

confidence: 99%

“…In 2020, Borah et al. [ 100 ] employed chemical etching treatment by adding HCl in the system to synthesize MoO x ( x = 2, 3) QDs. The average size of spherical MoO x is ≈4.5 nm.…”

Section: Semiconducting Qdsmentioning

confidence: 99%

Semiconducting Quantum Dots for Energy Conversion and Storage

Huang

2023

Adv Funct Materials

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Semiconducting quantum dots (QDs) have received huge attention for energy conversion and storage due to their unique characteristics, such as quantum size effect, multiple exciton generation effect, large surface‐to‐volume ratio, high density of active sites, and so on. However, the holistic and systematic understanding of the energy conversion and storage mechanism centering on QDs in specific application is still lacking. Herein, a comprehensive introduction of these extraordinary 0D materials, e.g., metal oxide, metal dichalcogenide, metal halides, multinary oxides, and nonmetal QDs, is presented. It starts with the synthetic strategies and unique properties of QDs. Highlights are focused on the rational design and development of advanced QDs‐based materials for the various applications in energy‐related fields, including photocatalytic H2 production, photocatalytic CO2 reduction, photocatalytic N2 reduction, electrocatalytic H2 evolution, electrocatalytic CO2 reduction, electrocatalytic N2 fixation, electrocatalytic O2 evolution, electrocatalytic O2 reduction, solar cells, metal‐ion batteries, lithium–sulfur batteries, metal–air batteries, and supercapacitors. At last, challenges and perspectives of semiconducting QDs for energy conversion and storage are detailedly proposed.

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“…Quantum dots (QDs) exhibit size dependent optical, structural, and electronic properties are owing to the quantum confinement effect [8,9]. Over the recent years, CdTe QDs have received remarkable research attention because of their tunable band gap, high fluorescence efficiency, and high quantum yield [1,2,10].…”

Section: Introductionmentioning

confidence: 99%

An investigation on the structural and optical properties of MSA capped CdTe quantum dots

Borah

Saikia

Das

et al. 2023

Preprint

Self Cite

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In this work, a modified sonication induced wet chemical approach is adopted to synthesize highly luminescent and water soluble Cadmium Telluride (CdTe) quantum dots (QDs). Cadmium Chloride and Sodium Tellurite are used as the source of Cadmium and Tellurium. To limit the size of the QDs, Mercaptosuccinic acid is used as a capping agent. The refluxing time dependence on morphology, size, crystal structural, and optical properties of CdTe QDs are investigated. The refluxing time-dependent optical constants viz. band gap energy and Urbach energy of the QDs are estimated from UV-Vis absorption spectra. The fluorescence spectra of the QDs are also investigated by recording the spectra under the excitation wavelength at 320 nm. CdTe QDs are found to uniform in size. The average size of the QDs estimated from the HRTEM image analysis is about 5.8 nm and 8.2 nm for refluxing times 1 and 4 hours, respectively. The growth mechanism of the QDs as a function of refluxing time has also been discussed. Two phases of the CdTe QDs, namely hexagonal and cubic are confirmed from the HRTEM images and SAED patterns analysis. The phase transformation from hexagonal to cubic is successfully achieved by tuning the refluxing time from 1 to 4 hours.

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Modified top-down approach for synthesis of molybdenum oxide quantum dots: sonication induced chemical etching of thin films

Abstract: A simple and modified top-down approach to synthesize molybdenum oxide (MoOx: x = 2, 3) quantum dots (QDs) is proposed in this study.

Cited by 21 publications

References 80 publications

Ultrabroadband Nanocavity of Hyperbolic Phonon–Polaritons in 1D-Like α-MoO₃

Ultrabroadband Nanocavity of Hyperbolic Phonon–Polaritons in 1D-Like α-MoO₃

Semiconducting Quantum Dots for Energy Conversion and Storage

An investigation on the structural and optical properties of MSA capped CdTe quantum dots

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Modified top-down approach for synthesis of molybdenum oxide quantum dots: sonication induced chemical etching of thin films

Abstract: A simple and modified top-down approach to synthesize molybdenum oxide (MoOx: x = 2, 3) quantum dots (QDs) is proposed in this study.

Cited by 21 publications

References 80 publications

Ultrabroadband Nanocavity of Hyperbolic Phonon–Polaritons in 1D-Like α-MoO3

Ultrabroadband Nanocavity of Hyperbolic Phonon–Polaritons in 1D-Like α-MoO3

Semiconducting Quantum Dots for Energy Conversion and Storage

An investigation on the structural and optical properties of MSA capped CdTe quantum dots

Contact Info

Product

Resources

About

Ultrabroadband Nanocavity of Hyperbolic Phonon–Polaritons in 1D-Like α-MoO₃

Ultrabroadband Nanocavity of Hyperbolic Phonon–Polaritons in 1D-Like α-MoO₃