Room-temperature BTEX sensing characterization of nanostructured ZnO thin films

Nagaraju, P.; Vijayakumar, Y.; Reddy, M.V. Ramana

doi:10.1080/21870764.2019.1579401

Cited by 22 publications

(10 citation statements)

References 25 publications

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“…The 3 wt % Cr-doped sensor responds significantly more to xylene than the other gases. It is due to the lower bond dissociation energy of xylene, and it can easily break its bonds to interact with the sensing material; subsequently, a considerable number of free electrons are released at the time of the reaction, which leads to a change in the resistance of the sensor element and a high sensitivity toward xylene. − …”

Section: Resultsmentioning

confidence: 99%

Facile Synthesis of Pure and Cr-Doped WO₃ Thin Films for the Detection of Xylene at Room Temperature

Sriram

Parne

Nagaraju³

et al. 2022

ACS Omega

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This paper focused on the preparation of pure and Crdoped tungsten trioxide (WO 3 ) thin films using the spray pyrolysis method. Different techniques were adopted to analyze these films' structural and morphological properties. The X-ray detection analysis showed that the average crystallite size of the WO 3 -nanostructured thin films increased as the Cr doping concentration increased. The atomic force microscopy results showed that the root-mean-square roughness of the films increased with Cr doping concentration up to 3 wt % and then decreased. The increased roughness is favorable for gas-sensing applications. Surface morphology and elemental analysis of the films were studied by field emission scanning electron microscopy with energydispersive X-ray spectroscopy measurements. The 3 wt % Cr-WO 3 has a large nanoflake-like structure with high surface roughness and porous morphology. Gas-sensing characteristics of undoped and Cr-doped WO 3 thin films were investigated with various gases at room temperature. The results showed that 3 wt % Cr-doped WO 3 film performed the maximum response toward 50 ppm of xylene with excellent selectivity at room temperature. We believe that increased lattice defects, surface morphology, and roughness due to Cr doping in the WO 3 crystal matrix might be responsible for increased xylene sensitivity.

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Section: Resultsmentioning

confidence: 99%

Facile Synthesis of Pure and Cr-Doped WO₃ Thin Films for the Detection of Xylene at Room Temperature

Sriram

Parne

Nagaraju³

et al. 2022

ACS Omega

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“…Further, the sensing area and operating temperature (room temperature) are maintained steady for room-temperature studies. The sensitivity of the sensor element can be determined using the following equation Sensitivity = R air R gas …”

Section: Gas-sensing Characterizationmentioning

confidence: 99%

Investigattions on ZnO Thin Films Modified with Urea: An Approach as Ammonia Sensor

Vaddadi

Parne

Nagaraju³

et al. 2023

ACS Omega

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Pure and urea-modified zinc oxide thin films are prepared using the spray pyrolysis technique on microscopic glass substrates. We have added different urea concentrations as a modifier to the zinc acetate precursor for obtaining urea-modified ZnO thin films and investigated the effect of the urea concentration on the structural, morphological, optical, and gas-sensing properties. The gas-sensing characterization of pure and urea-modified ZnO thin films is tested in the static liquid distribution technique with 25 ppm of ammonia gas at an operating temperature of 27 °C. The prepared film with a concentration of 2 wt % of urea has shown the best sensing properties toward ammonia vapors due to more active sites for the reaction between chemiabsorbed oxygen and the target vapors.

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“…In order to study the optical properties of pure and Ce-doped SnO 2 nanoparticles, the energy bandgap (Eg) was determined for these samples with the help of Tauc plots which is depicted in Figure 7. It can be determined using Equation ( 6) [36]. Where ν is photon frequency, A is a constant, α is the absorption coefficient, h is Planck's constant, and Eg is the bandgap.…”

Section: Optical Propertiesmentioning

confidence: 99%

Low-cost ultra-sensitive SnO₂-based ammonia sensor synthesized by hydrothermal method

Gavaskar

Nagaraju

Vijayakumar

et al. 2020

Journal of Asian Ceramic Societies

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Tin oxide (SnO 2 ) and 2 mol% Ce-doped SnO 2 nanoparticles synthesized by the hydrothermal method to detect ammonia vapors at room temperature. X-ray diffraction investigations have been confirmed that the synthesized nanoparticles are polycrystalline in nature with tetragonal rutile phase. The particle size is determined using Scherrer's formula and it is found to increase with the "Ce" dopant. Scanning electron microscopy observations reveal that these samples have spherical morphology composed of fine crystallites. The EDX spectra reveal the dominant presence of Sn and O in the case of pure SnO 2 nanoparticles. Whereas in the case of doped sample, the EDX reveals the existence of Ce in lesser percentage in comparison with the Sn and O. Atomic force microscopy studies reveals that the root mean square roughness of the nanoparticles is increased from 4.4 nm to 15.3 nm due to the Ce dopant in the SnO 2 matrix. Optical bandgap is calculated with the Tauc plot and it is increased with the doping of cerium atoms and it is due to the Burstein-Moss effect. Gas-sensing characterization has been performed using static liquid distribution technique against various volatile organic compounds (VOCs) such as ammonia, ethanol, methanol and toluene in the range of 1 to 25ppm at room temperature.

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Room-temperature BTEX sensing characterization of nanostructured ZnO thin films

Cited by 22 publications

References 25 publications

Facile Synthesis of Pure and Cr-Doped WO₃ Thin Films for the Detection of Xylene at Room Temperature

Facile Synthesis of Pure and Cr-Doped WO₃ Thin Films for the Detection of Xylene at Room Temperature

Investigattions on ZnO Thin Films Modified with Urea: An Approach as Ammonia Sensor

Low-cost ultra-sensitive SnO₂-based ammonia sensor synthesized by hydrothermal method

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Room-temperature BTEX sensing characterization of nanostructured ZnO thin films

Cited by 22 publications

References 25 publications

Facile Synthesis of Pure and Cr-Doped WO3 Thin Films for the Detection of Xylene at Room Temperature

Facile Synthesis of Pure and Cr-Doped WO3 Thin Films for the Detection of Xylene at Room Temperature

Investigattions on ZnO Thin Films Modified with Urea: An Approach as Ammonia Sensor

Low-cost ultra-sensitive SnO2-based ammonia sensor synthesized by hydrothermal method

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Product

Resources

About

Facile Synthesis of Pure and Cr-Doped WO₃ Thin Films for the Detection of Xylene at Room Temperature

Facile Synthesis of Pure and Cr-Doped WO₃ Thin Films for the Detection of Xylene at Room Temperature

Low-cost ultra-sensitive SnO₂-based ammonia sensor synthesized by hydrothermal method