MnWO4 nanocapsules: Synthesis, characterization and its electrochemical sensing property

Muthamizh, S.; Suresh, Ranganathan; Giribabu, K.; Manigandan, R.; Sivakumar, V.; Munusamy, S.; Narayanan, Vijaykrishnan

doi:10.1016/j.jallcom.2014.09.049

Cited by 79 publications

(23 citation statements)

References 39 publications

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“…The low binding energy doublet at 35.4 and 37.5 eV is in good agreement with the binding energy values reported in the literature for metal tungstates. 27,28 The high binding energy doublet at 36.0 and 38.1 eV is more pronounced in the AR1.5 catalyst than in the AR5.1 catalyst, in line with the higher hydroxyl concentration observed in the O 1s spectrum of the AR1.5 catalyst. Furthermore, the contribution of the high binding energy W 4f doublet as well as the hydroxide component in the O 1s spectrum is decreasing with increasing probing depth (compare Fig.…”

Section: Ethanol Oxidationsupporting

confidence: 53%

Hydrothermal synthesis of bi-functional nanostructured manganese tungstate catalysts for selective oxidation

Lunkenbein

Kröhnert

et al. 2016

Faraday Discuss.

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The mechanism of C-H activation in selective oxidation reactions of short-chain alkane molecules over transition metal oxides is critically affected by the balance of acid-base and redox sites at the surface of the catalyst. Using the example of manganese tungstate we discuss how the relative abundance of these sites can be controlled via synthetic techniques. Phase-pure catalysts composed of the thermodynamic stable monoclinic MnWO4 phase have been prepared using hydrothermal synthesis. Variation of the initial pH value resulted in rod-shaped nano-crystalline MnWO4 catalysts composed of particles with varying aspect ratio. The synthesis products have been analysed using transmission electron microscopy, X-ray diffraction, infrared, and photoelectron spectroscopy. In situ Raman spectroscopy was used to investigate the dissolution-re-crystallization processes occurring under hydrothermal conditions. Ethanol oxidation was applied to probe the surface functionalities in terms of acid-base and redox properties. Changes in the aspect ratio of the primary catalyst particles are reflected in the product distribution induced by altering the fraction of acid-base and redox sites exposed at the surface of the catalysts in agreement with the proposed mechanism of particle growth by re-crystallization during ageing under hydrothermal conditions.

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Section: Ethanol Oxidationsupporting

confidence: 53%

Hydrothermal synthesis of bi-functional nanostructured manganese tungstate catalysts for selective oxidation

Lunkenbein

Kröhnert

et al. 2016

Faraday Discuss.

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“…Similarly, Muthamizh et al. reported the electrocatalytic behavior of the MnWO 4 towards the oxidation of the quercetin molecules . Inspiring with the reported works, here we report the facile and novel hydrothermal growth of MnWO 4 nanorods at two different pH; 7 and 9 and their electrochemical glucose sensing and supercapacitor properties have been investigated.…”

Section: Introductionsupporting

confidence: 70%

“…Figure a shows the CVs in the presence of NaOH and in 100 μM glucose solution. The distinct anodic peak (I ap ) was observed at 0.5 V and cathodic peak (I cp ) at 0.3 V is assigned to pure MnWO 4 which indicates the strong catalytic and biocatalytic properties of the material towards glucose molecule ,…”

Section: Resultsmentioning

confidence: 96%

Facile Hydrothermal Synthesis of MnWO₄ Nanorods for Non‐Enzymatic Glucose Sensing and Supercapacitor Properties with Insights from Density Functional Theory Simulations

et al. 2017

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Here we report a facile and novel hydrothermal method to grow MnWO 4 nanorods and their electrochemical glucose sensing and supercapacitor properties have been investigated. MnWO 4 nanorods exhibited good glucose sensing performance with sensitivity of 13.7 mAmM À1 cm À2 in the 5-110 mM linear range and specific capacitance of 199 F/g at 2 mV/s and 256.41 F/g at 0.4 A/g. First principles simulations have also been carried out to qualitatively support our experimental observations by investigating the bonding and charge transfer mechanism of glucose on MnWO 4 through demonstration of Partial Density of States and charge density distributions. Large Density of States near Fermi level and empty d states around 2 eV above Fermi level of Mn d orbital qualify MnWO 4 as communicating media to transfer the charge from glucose by participating in the redox reactions. Insight into the electronic structure reveals that there is charge transfer from oxygen p orbital of glucose to d orbital of Mn. Also, the quantum capacitance of MnWO 4 electrodes has been presented to justify its supercapacitor performance. The maximum quantum capacitance of 762 mF/cm 2 is obtained which is mostly contributed by the d electrons of Mn. Our experimental data and theoretical insight strongly infer that MnWO 4 has the potential to be tailored as efficient and high-performance glucose sensing and energy storage devices.

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“…The absorption coefficient α in many amorphous semiconductors shows an exponential dependence on photon energy usually obeying the empirical relation. The band gap of Phellodendron phosphor (E g ) was determined by using Tauc's plot [43][44][45][46] .…”

Section: Resultsmentioning

confidence: 99%

Phellodendron chinense Schneid: A novel yellow-emitting luminescent material for white light-emitting diodes

Lin

Hsu

Shiu³

et al. 2017

Sci Rep

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To facilitate the next generation of environmental material for white light emitting diodes, the discovery of natural luminesce is essential. In this study, we disclose a rare-earth free and yellow-emission phosphor, Phellodendron, which could be both excited by near ultraviolet light and blue light. The new yellow phosphor is obtained by extraction of Phellodendron chinense Schneid. The emission wavelength, full width at half maximum and CIE coordinates of extracted Phellodendron are 540 nm, 120 nm and (0.41, 0.55), respectively. The corresponding luminescent properties of Phellodendron are characterized by PL, PLE, reflection spectra, FITR and decay lifetime. Surprising thing is luminous intensity of Phellodendron phosphors excited at 380 nm was stronger than YAG:Ce phosphor by more than 139%. In addition, we firstly introduce the yellow phosphor in white LED fabrication by combining blue chip and Y3Al5O12:Ce3+ phosphor, to create warm white. For comparison, red-emission CaAlSiN3:Eu2+ phosphors are also introduced for LED package tests. The results demonstrate that Phellodendron is a potential candidate for white LED applications.

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MnWO4 nanocapsules: Synthesis, characterization and its electrochemical sensing property

Cited by 79 publications

References 39 publications

Hydrothermal synthesis of bi-functional nanostructured manganese tungstate catalysts for selective oxidation

Hydrothermal synthesis of bi-functional nanostructured manganese tungstate catalysts for selective oxidation

Facile Hydrothermal Synthesis of MnWO₄ Nanorods for Non‐Enzymatic Glucose Sensing and Supercapacitor Properties with Insights from Density Functional Theory Simulations

Phellodendron chinense Schneid: A novel yellow-emitting luminescent material for white light-emitting diodes

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MnWO4 nanocapsules: Synthesis, characterization and its electrochemical sensing property

Cited by 79 publications

References 39 publications

Hydrothermal synthesis of bi-functional nanostructured manganese tungstate catalysts for selective oxidation

Hydrothermal synthesis of bi-functional nanostructured manganese tungstate catalysts for selective oxidation

Facile Hydrothermal Synthesis of MnWO4 Nanorods for Non‐Enzymatic Glucose Sensing and Supercapacitor Properties with Insights from Density Functional Theory Simulations

Phellodendron chinense Schneid: A novel yellow-emitting luminescent material for white light-emitting diodes

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Product

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About

Facile Hydrothermal Synthesis of MnWO₄ Nanorods for Non‐Enzymatic Glucose Sensing and Supercapacitor Properties with Insights from Density Functional Theory Simulations