Effect of concentration of SiC on physicochemical properties of CoFe2O4/SiC nanocomposites

Khan, Meenu; Pawar, Hariom; Kumari, Manisha; Patra, Chayan; Patel, G. N.; Dwivedi, Umesh Kumar; Rathore, Deepshikha

doi:10.1016/j.jallcom.2020.155596

Cited by 16 publications

(8 citation statements)

References 13 publications

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“…Further, the (α h ν) 2 versus energy curve was plotted in Figure b to calculate the energy bandgap ( E g ). The Tauc relation is given as α h ν = A ( h ν − E g ) 1 / 2 where the absorption coefficient (α), constant ( A ), incident photon energy ( h ν), and bandgap energy ( E g ) were used. The energy bandgap was estimated to be ∼3.39 eV using the intercept of Figure b.…”

Section: Resultsmentioning

confidence: 99%

p-/n-Type Switching in the Ag/BTO/TiO₂ Nanocomposite as a Gas Sensor toward Ethanol, Liquefied Petroleum Gas, and Ammonia

Paul,

Aamir,

Aslam

et al. 2023

Langmuir

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A novel Ag/BTO/TiO 2 nanocomposite was prepared using chemical reduction and sol−gel techniques followed by sintering at ∼950 °C to grow rutile TiO 2 and remove organic materials and hydroxyl groups. The structural, optical, morphological, dielectric, and gas-sensing properties were investigated using X-ray diffraction, Fourier transform infrared spectroscopy, ultraviolet−visible spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy, and inductance, capacitance, and resistance meter, respectively. The surface plasmon resonance peak of Ag was observed at 428 nm, and the absorption edge of the Ag/BTO/TiO 2 nanocomposite was observed at 235 nm, with an energy bandgap of 5.42 eV. The dielectric constant is lower at 25 °C and becomes highest at 350 °C and low frequency. The percentage response is better toward ammonia than ethanol and liquefied petroleum gas (LPG) at 25 °C, while it is greater, ∼87%, for LPG at a higher temperature. The p-/n-type switching and vice versa were recorded in the whole gas-sensing measurement. During response− recovery time, the device performed as n type for ethanol and ammonia and p type for LPG, with a very fast response time of ∼4 s for all gases. The recovery time for ethanol was achieved at 20−25 s, while for LPG and ammonia, it was ∼60 s. Moreover, the negative and positive activation energies also confirm the switching behavior in the novel Ag/BTO/TiO 2 nanocomposite.

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Section: Resultsmentioning

confidence: 99%

p-/n-Type Switching in the Ag/BTO/TiO₂ Nanocomposite as a Gas Sensor toward Ethanol, Liquefied Petroleum Gas, and Ammonia

Paul,

Aamir,

Aslam

et al. 2023

Langmuir

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“…The dielectric loss as a function of frequency with variation of temperature is depicted in Figures 9C,D. The dielectric loss decreased rapidly as the frequency initially increased until 1 MHz and 0.5 MHz for n-type and p-type Si NWs, respectively, and became constant but as the temperature increased from 30℃ to higher temperatures the dielectric loss increased with an increase in frequency because of the ion exchange anisotropy phenomenon (Khan et al, 2020), where at high temperature the ions tend to move from the barrier and produce polarization at a large scale.…”

Section: Dielectric Propertiesmentioning

confidence: 99%

“…The gas-sensing behavior of the sensors was investigated by observing the change in resistance in air and oxidizing gas atmosphere using the following relationship (Pawar et al, 2020):…”

Section: Gas-sensing Propertiesmentioning

confidence: 99%

Analysis of synthesized doped vertical silicon nanowire arrays for effective sensing of nitrogen dioxide: As gas sensors

et al. 2022

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In the present study, the controllable fabrication of silicon nanowires (Si NWs) with vertical alignment was accomplished using metal assisted chemical etching (MACE). The different characteristics, such as structural, morphological, chemical, optical, and dielectric properties were analyzed using X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), Raman spectroscopy, ultraviolet-visible diffuse reflectance spectroscopy (UV-DRS), and LCR [inductance (L), capacitance (C), and resistance (R)] meter (volume of the gas-sensing chamber is 650 mm3). It was revealed from the morphological study i.e., from the FESEM that p-type Si NWs are smaller in size than n-type Si NWs which is attributable to the energy band gap. The optical band gap (Eg) is observed to increase from 1.64 to 1.89 eV with the decreasing of the crystallite size and the optical reflection spectra of the Si NWs show a shift toward a lower wavelength (blue shift). Moreover, Raman spectra verified the red-shifted, asymmetrically broadened Raman line-shapes, which provides information about the size confinement effect in Si NWs. The MACE approach is excellent for synthesizing nanowire structures for use in gas-sensing applications due to its flexibility. The sensitivity of synthesized Si NWs was tested for NO2 gas. The sensor method is unique based on the testing of the device in the presence of a test gas because the use of the gas-sensing setup has the potential to measure the change in resistance by varying frequency, temperature, and time.

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“…The synthesis of nanoferrites is readily accomplished by "bottom up" approaches such as sol-gel, chemical co-precipitation, hydrothermal, and micro-emulsion techniques. 3 The size of the nanoferrites plays a vital role in sensing technology. Their sensing properties can be enhanced by varying several physical parameters, such as temperature, time, and pressure, and chemical parameters, such as molar ratio, concentration, and the nature of the reaction.…”

Section: Introductionmentioning

confidence: 99%

“…They found that the 10 wt% Ni and 0.2 wt% Sm doped CoFe 2 O 4 showed higher sensitivity and selectivity towards H 2 S gas than other reducing gases. Khan et al 8 studied the synthesis of CoFe 2 O 4 /SiC nanocomposites by a chemical co-precipitation method with various wt% of SiC. They found that the dielectric properties, a.c. conductivity and sensitivity (%) for NH 3 gas were higher for 20 wt% of CFO/SiC nanocomposites than for nanocomposites with other wt%.…”

Section: Introductionmentioning

confidence: 99%

Co_1−xBa_xFe₂O₄ (x = 0, 0.25, 0.5, 0.75 and 1) nanoferrites as gas sensor towards NO₂ and NH₃ gases

et al. 2020

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Effect of concentration of SiC on physicochemical properties of CoFe2O4/SiC nanocomposites

Cited by 16 publications

References 13 publications

p-/n-Type Switching in the Ag/BTO/TiO₂ Nanocomposite as a Gas Sensor toward Ethanol, Liquefied Petroleum Gas, and Ammonia

p-/n-Type Switching in the Ag/BTO/TiO₂ Nanocomposite as a Gas Sensor toward Ethanol, Liquefied Petroleum Gas, and Ammonia

Analysis of synthesized doped vertical silicon nanowire arrays for effective sensing of nitrogen dioxide: As gas sensors

Co_1−xBa_xFe₂O₄ (x = 0, 0.25, 0.5, 0.75 and 1) nanoferrites as gas sensor towards NO₂ and NH₃ gases

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Effect of concentration of SiC on physicochemical properties of CoFe2O4/SiC nanocomposites

Cited by 16 publications

References 13 publications

p-/n-Type Switching in the Ag/BTO/TiO2 Nanocomposite as a Gas Sensor toward Ethanol, Liquefied Petroleum Gas, and Ammonia

p-/n-Type Switching in the Ag/BTO/TiO2 Nanocomposite as a Gas Sensor toward Ethanol, Liquefied Petroleum Gas, and Ammonia

Analysis of synthesized doped vertical silicon nanowire arrays for effective sensing of nitrogen dioxide: As gas sensors

Co1−xBaxFe2O4 (x = 0, 0.25, 0.5, 0.75 and 1) nanoferrites as gas sensor towards NO2 and NH3 gases

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p-/n-Type Switching in the Ag/BTO/TiO₂ Nanocomposite as a Gas Sensor toward Ethanol, Liquefied Petroleum Gas, and Ammonia

p-/n-Type Switching in the Ag/BTO/TiO₂ Nanocomposite as a Gas Sensor toward Ethanol, Liquefied Petroleum Gas, and Ammonia

Co_1−xBa_xFe₂O₄ (x = 0, 0.25, 0.5, 0.75 and 1) nanoferrites as gas sensor towards NO₂ and NH₃ gases