Solid state electrical conductivity and humidity sensing studies on metal molybdate–molybdenum trioxide composites (M = Ni2+, Cu2+ and Pb2+)

Sundaram, R.; Nagaraja, K.S.

doi:10.1016/j.snb.2004.04.005

Cited by 74 publications

(25 citation statements)

References 19 publications

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“…The resistance changes in porous oxides with increasing humidity levels occur because of the adsorption and capillary condensation of water. At low humidity levels, chemisorption takes place leading to the formation of two surface hydroxyls with the charge transport occurring by the hopping mechanism [25]. While at high humidity levels, water is physisorbed on the top of the chemisorbed layer.…”

Section: Humidity Sensingmentioning

confidence: 99%

Synthesis of metal ferrite (MFe₂O₄, M = Co, Cu, Mg, Ni, Zn) nanoparticles as humidity sensor materials

Jeseentharani¹,

George²,

Jeyaraj³

et al. 2013

Journal of Experimental Nanoscience

150

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Humidity sensitivity of metal ferrite nanoparticles [MFe 2 O 4 , M (II) ¼ Co, Cu, Mg, Ni and Zn] prepared by solid-state reaction of inorganic precursors was studied. The process was convenient, environmentally-friendly, inexpensive and efficient. The spinel structure of the compounds prepared by this method was confirmed by XRD and FT-IR studies. The surface morphology was observed by scanning electron microscopy, and the surface area was analysed by the nitrogen adsorption/desorption study by the Brunauer-Emmett-Teller (BET) method. All the samples were subjected to dc electrical conductivity studies at room temperature. The resistance measurements as a function of relative humidity in the range of 5-98% and the sensitivity factor (S f ¼ R 5% / R 98% ) were calculated. Among all the metal ferrites, zinc ferrite (ZnFe 2 O 4 ) possessed the highest humidity sensitivity factor of 2895 � 85, whereas the other compounds possessed a very low sensitivity factor. The response and recovery times of ZnFe 2 O 4 were 330 and 80 s.

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Section: Humidity Sensingmentioning

confidence: 99%

Synthesis of metal ferrite (MFe₂O₄, M = Co, Cu, Mg, Ni, Zn) nanoparticles as humidity sensor materials

Jeseentharani¹,

George²,

Jeyaraj³

et al. 2013

Journal of Experimental Nanoscience

150

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“…[26] By taking advantage of the narrowed band gap, this compound has also been used as ap hotocatalyst to decontaminate waste water by decomposing organic pollutantsu nder visible light irradiation. [27,28] To the best of our knowledge,t here have not hitherto been any reportso ni ts potentiala pplication as an anode materialf or rechargeable batteries, especially for SIBs. In this work, Ag 2 Mo 2 O 7 powder has been prepared by the conventional solid-state reaction and its electrochemical properties have been comprehensively studied between 3.0 and 0.01 Vi natypical SIB cell by means of galvanostatic charge-dischargec ycling, cyclic voltammetry, and rate capability measurements.…”

Section: Introductionmentioning

confidence: 98%

Electrochemical Properties and Sodium‐Storage Mechanism of Ag₂Mo₂O₇ as the Anode Material for Sodium‐Ion Batteries

Chen

Gao

Zhang

et al. 2016

Chemistry A European J

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Silver molybdate, Ag2 Mo2 O7 , has been prepared by a conventional solid-state reaction. Its electrochemical properties as an anode material for sodium-ion batteries (SIBs) have been comprehensively examined by means of galvanostatic charge-discharge cycling, cyclic voltammetry, and rate performance measurements. At operating voltages between 3.0 and 0.01 V, the electrode delivered a reversible capacity of nearly 190 mA h g(-1) at a current density of 20 mA g(-1) after 70 cycles. Ag2 Mo2 O7 also demonstrated a good rate capability and long-term cycle stability, the capacity reaching almost 100 mA h g(-1) at a current density of 500 mA g(-1) , with a capacity retention of 55 % over 1000 cycles. Moreover, the sodium storage process of Ag2 Mo2 O7 has been investigated by means of ex situ XRD, Raman spectroscopy, and HRTEM. Interestingly, the anode decomposes into Ag metal and Na2 MoO4 during the initial discharge process, and then Na(+) ions are considered to be inserted into/extracted from the Na2 MoO4 lattice in the subsequent cycles governed by an intercalation/deintercalation mechanism. Ex situ HRTEM images revealed that Ag metal not only remains unchanged during the sodiation/desodiation processes, but is well dispersed throughout the amorphous matrix, thereby greatly improving the electronic conductivity of the working electrode. The "in situ" decomposition behavior of Ag2 Mo2 O7 is distinct from that of chemically synthesized, metal-nanoparticle-coated electrode materials, and provides strong supplementary insight into the mechanism of such new anode materials for SIBs and may set a precedent for the design of further materials.

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“…As an interesting inorganic functional material, molybdates have attracted special attention because of their wide use in catalysis, luminescent materials, pigments, and so on. [11][12][13][14][15][16] Molybdate phosphors have broad and intense absorption bands due to charge transfer (CT) from oxygen to metal in the near-UV region. [17][18][19][20][21] For example, trivalent rare earth molybdate phosphors, such as Y 2 (MoO 4 ) 3 :Eu 3+ and Gd 2 (MoO 4 ) 3 :Dy 3+ , have been investigated because they are good hosts for red and green emitting phosphors for solid-state lighting based on InGaN diodes.…”

Section: Introductionmentioning

confidence: 99%

Bilayer stabilized Ln³⁺-doped CaMoO₄ nanocrystals with high luminescence quantum efficiency and photocatalytic properties

et al. 2014

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In this article, we discuss the microwave synthesis of sodium dodecyl sulphate (SDS) stabilized Ln(3+)-doped CaMoO4 nanocrystals (Ln(3+) = Eu(3+), Er(3+)/Yb(3+)). The nanocrystals are quite monodispersed with an average size close to 100 nm. FTIR and TGA analyses suggest strong binding of the SDS molecules to the CaMoO4 nanocrystals surface. The high dispersibility of the nanocrystals in water implies that SDS stabilizes the nanocrystals as a bilayer structure. The SDS coating also assists in the easy dispersion of the nanocrystals in toluene without any additional surface chemistry. The Eu(3+) ions doped in the CaMoO4 nanocrystals display very strong red luminescence with a quantum yield close to 40%. Under 980 nm excitation, Er(3+)/Yb(3+)-doped CaMoO4 nanocrystals display Er(3+) emissions at 550 and 650 nm. In addition, interestingly, a NIR peak at around 833 nm is observed, which occurred via a three photon process. Furthermore, the CaMoO4 nanocrystals exhibit photocatalytic activity which is studied through the degradation of Rhodamine B (RhB) dye in neutral conditions. The RhB dye is significantly degraded by ~80% under UV illumination within 4 h and the rate of degradation is comparable to that observed for well known ZnO nanoparticles. The high luminescence quantum efficiency and strong photocatalytic activity of the Ln(3+)-doped CaMoO4 nanocrystals make them a potential material for dual applications such as bio-imaging and photocatalysis.

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Solid state electrical conductivity and humidity sensing studies on metal molybdate–molybdenum trioxide composites (M = Ni2+, Cu2+ and Pb2+)

Cited by 74 publications

References 19 publications

Synthesis of metal ferrite (MFe₂O₄, M = Co, Cu, Mg, Ni, Zn) nanoparticles as humidity sensor materials

Synthesis of metal ferrite (MFe₂O₄, M = Co, Cu, Mg, Ni, Zn) nanoparticles as humidity sensor materials

Electrochemical Properties and Sodium‐Storage Mechanism of Ag₂Mo₂O₇ as the Anode Material for Sodium‐Ion Batteries

Bilayer stabilized Ln³⁺-doped CaMoO₄ nanocrystals with high luminescence quantum efficiency and photocatalytic properties

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Solid state electrical conductivity and humidity sensing studies on metal molybdate–molybdenum trioxide composites (M = Ni2+, Cu2+ and Pb2+)

Cited by 74 publications

References 19 publications

Synthesis of metal ferrite (MFe2O4, M = Co, Cu, Mg, Ni, Zn) nanoparticles as humidity sensor materials

Synthesis of metal ferrite (MFe2O4, M = Co, Cu, Mg, Ni, Zn) nanoparticles as humidity sensor materials

Electrochemical Properties and Sodium‐Storage Mechanism of Ag2Mo2O7 as the Anode Material for Sodium‐Ion Batteries

Bilayer stabilized Ln3+-doped CaMoO4 nanocrystals with high luminescence quantum efficiency and photocatalytic properties

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Product

Resources

About

Synthesis of metal ferrite (MFe₂O₄, M = Co, Cu, Mg, Ni, Zn) nanoparticles as humidity sensor materials

Synthesis of metal ferrite (MFe₂O₄, M = Co, Cu, Mg, Ni, Zn) nanoparticles as humidity sensor materials

Electrochemical Properties and Sodium‐Storage Mechanism of Ag₂Mo₂O₇ as the Anode Material for Sodium‐Ion Batteries

Bilayer stabilized Ln³⁺-doped CaMoO₄ nanocrystals with high luminescence quantum efficiency and photocatalytic properties