Synthesis of α-MoO3 nanofibers for enhanced field-emission properties

Patel, S.; Dewangan, Khemchand; Srivastav, Simant Kumar; Verma, N. K.; Jena, Paramananda; Singh, Ashish Kumar; Gajbhiye, N. S.

doi:10.5185/amlett.2018.2022

Cited by 45 publications

(10 citation statements)

References 17 publications

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“…Raman spectrum of the MoO 3 NR (Figure 1b, blue curve) shows the following vibrational modes: at 156 cm −1 (A g , B 1g )-originating from the translation of the rigid chains, at 290 cm −1 (B 2g , B 3g )-a doublet comprised of wagging modes of the terminal oxygen atoms, at 666.5 cm −1 (B 2g , B 3g )-corresponds to the asymmetric stretching of the MoOMo bridge along the c axis, at 820 cm −1 (A g , B 1g )-a symmetric stretch of the terminal oxygen atoms, and at 995 cm −1 (A g , B 1g )-the asymmetric stretch of the terminal oxygen atoms. [25] This confirms the formation of MoO 3 . The Raman spectrum of MoS 2 NR shows vibrational modes corresponding to that of E 2g (379 cm −1 ) and A 1g (405 cm −1 ), Figure 1b, black curve.…”

Section: Resultssupporting

confidence: 65%

Photo Rechargeable Li‐Ion Batteries Using Nanorod Heterostructure Electrodes

Kumar

Thakur

Sharma

et al. 2021

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sectors, such as in high energy density demand portable devices, solar vehicles, solar impulse planes, satellites, etc. [4][5][6] This concept was initially proposed by Hodes et al. in 1976, where they have shown a three-electrode system comprised of cadmium selenide, sulfur, and silver sulfide (CdSe/S/Ag 2 S). [7] In this system, one of the components acted as photoelectrode while the others acted as the components for the energy storage. Such efforts have continued with other threeelectrode systems, such as n-cadmium selenide telluride/cesium sulfide/tin sulfide [8] and hybrid titania (TiO 2 ) poly(3,4ethylenedioxythiophene) as photo anode and a perchlorate (ClO 4 − )-doped polypyrroles counter electrode. This approach was improved by using a two-electrode system with a hybrid mixture of lithium iron phosphate (LFP) nanocrystals and N719 dye as the active photo-electrode assembled with lithium metal as counter electrode. [9] The N719 dye acts as photon absorber and lithium iron phosphate (LFP) as cathode. In this system, during the photocharging, the electrons produced during the photo-excitation of the dye generate holes in the valance band which repel Li-ions from their intercalated state. The continuous photo-conversion drives the battery to reach back in the charged state (in 30 h) with a 200 W solar spectrum (simulator). [9] It has low photo conversion efficiency and it was observed that soon after the first cycle, the charge capacity started fading due to dissolution of the organic dye in to the organic electrolyte.A different approach was attempted later, where a polycrystalline metal halide based 2D perovskite was used as a photoactive electrode ((C 6 H 9 C 2 H 4 NH 3 ) 2 PbI 4 ) that could provide both energy storage (battery functionality) and photo charging (photovoltaic functionality). [10] This perovskite system provided a low photo conversion efficiency of ≈0.034%. Furthermore, the system suffered from various other challenges such as the conversion reaction between lithium and perovskite generating lead (Pb), where it can further alloy with lithium causing a large volume expansion.More recently, it was reported that an organic molecule based photo-electrode could also be used for photo charging. [11] Absorption of light of a desired wavelength by lithiatedtetrakislawsone electrodes generates electron-hole pairs, and the holes oxidize the lithiated-tetrakislawsone to tetrakislawsone while the generated electrons flow from the tetrakislawsone New ways of directly using solar energy to charge electrochemical energy storage devices such as batteries would lead to exciting developments in energy technologies. Here, a two-electrode photo rechargeable Li-ion battery is demonstrated using nanorod of type II semiconductor heterostructures with in-plane domains of crystalline MoS 2 and amorphous MoO x . The staggered energy band alignment of MoS 2 and MoO x limits the electron holes recombination and causes holes to be retained in the Li intercalated MoS 2 electrode. The holes generated in the MoS 2 pushes...

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Section: Resultssupporting

confidence: 65%

Photo Rechargeable Li‐Ion Batteries Using Nanorod Heterostructure Electrodes

Kumar

Thakur

Sharma

et al. 2021

Small

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“…Raman spectrum of the MoO3 NR (figure 1 (b), blue curve) shows the following vibrational modes: at 156 cm −1 (Ag, B1g) originating from the translation of the rigid chains, at 290 cm −1 (B2g, B3g) a doublet comprised of wagging modes of the terminal oxygen atoms, at 666.5 cm −1 (B2g, B3g) corresponds to the asymmetric stretching of the Mo-O-Mo bridge along the c axis, at 820 cm −1 (Ag, B1g) is a symmetric stretch of the terminal oxygen atoms, and at 995 cm −1 (Ag, B1g) is the asymmetric stretch of the terminal oxygen atoms. 25 This confirms the formation of MoO3. The Raman spectrum of MoS2 NR shows vibrational modes correspond to that of E2g (379 cm −1 ) and A1g (405 cm −1 ), figure 1 chemical state (all the peaks are normalised by C 1s peak).…”

Section: Structure and Chemical Nature Of Mos2 / Moox Nrssupporting

confidence: 66%

Photo Rechargeable Li-Ion Batteries using Nanorod Heterostructure Electrodes

Narayanan

Kumar

Thakur

et al. 2021

Preprint

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New ways of directly using solar energy to charge electrochemical energy storage devices such as batteries would lead to exciting developments in energy technologies. Here, a two-electrode photo-rechargeable Li-ion battery is demonstrated using nanorod of type II semiconductor heterostructures with in-plane domains of crystalline MoS2 and amorphous MoOx. The staggered energy band alignment of MoS2 and MoOx limits the electron holes recombination and cause holes to be retained in the Li intercalated MoS2 electrode. The holes generated in the MoS2 pushes the intercalated Li + ions and hence, charge the cell. Low band gap, high efficiency photo-conversion and efficient electron-hole separation help the battery to fully charge within a few hours with a low power light. The proposed concept and materials could enable next generation stable solar chargeable battery electrodes, in contrast to the reported materials.

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“…The peak at 286 cm −1 (B 2g , B 3g ) occurs due to the wagging modes of the terminal oxygen atoms [29]. The peak at 381 cm −1 represents the A g mode [30].…”

Section: Raman Spectroscopymentioning

confidence: 99%

Role of Mo thickness in growth of nanostructured MoO₃ and their optical sensing properties

Dwivedi

2024

Phys. Scr.

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The main objective of the present work is to investigate the role Mo thickness in growth of nanostructured MoO3 and their application for optical sensors like photodetectors. The devices were fabricated using standard scalable microfabrication techniques. MoO3 was synthesized by Mo thin film deposition using sputtering followed by dry oxidation at 550oC. Further, these samples were tested as photodetectors for visible regions. The test results confirm that the devices are more sensitive towards 450 nm. The photodetector made on 80 nm Mo thickness exhibited a higher responsivity of 730 mA/W, higher detectivity of 2.47×1011 Jones, and higher photo to dark current ratio (PDCR) of 1.33×102 compared to other tested samples. Moreover, the optimized photodetector showed higher repeatability and a faster speed of 13/11 ms. These developed photodetectors could be vital for the visible light optical sensing era.

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Synthesis of α-MoO3 nanofibers for enhanced field-emission properties

Cited by 45 publications

References 17 publications

Photo Rechargeable Li‐Ion Batteries Using Nanorod Heterostructure Electrodes

Photo Rechargeable Li‐Ion Batteries Using Nanorod Heterostructure Electrodes

Photo Rechargeable Li-Ion Batteries using Nanorod Heterostructure Electrodes

Role of Mo thickness in growth of nanostructured MoO₃ and their optical sensing properties

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Synthesis of α-MoO3 nanofibers for enhanced field-emission properties

Cited by 45 publications

References 17 publications

Photo Rechargeable Li‐Ion Batteries Using Nanorod Heterostructure Electrodes

Photo Rechargeable Li‐Ion Batteries Using Nanorod Heterostructure Electrodes

Photo Rechargeable Li-Ion Batteries using Nanorod Heterostructure Electrodes

Role of Mo thickness in growth of nanostructured MoO3 and their optical sensing properties

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Role of Mo thickness in growth of nanostructured MoO₃ and their optical sensing properties