Fabrication of ultrasensitive hexagonal disc structured ZnO thin film sensor to trace nitric oxide

Bhat, Pratima; K, Naveen Kumar S; Nagaraju, P.

doi:10.1080/21870764.2020.1848036

Cited by 10 publications

(4 citation statements)

References 52 publications

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“…11 The optical band gap (E g ) of indium oxide thin films sprayed at various substrate temperatures is determined by adopting the Tauc expression using the absorption spectra. 37…”

Section: ■ Introductionmentioning

confidence: 99%

Nanostructured Indium Oxide Thin Films as a Room Temperature Toluene Sensor

Dasari

Nagaraju²,

Vijayakumar

et al. 2021

ACS Omega

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Toluene gas is the most toxic and affects the respiratory system of humans, and thereby, its detection at lower levels is an important task. Herein, we report a room temperature-operatable indium oxide-based chemiresistive gas sensor, which detects 50 ppm toluene vapors. Nanocrystalline indium oxide (In 2 O 3 ) films were sprayed on a precleaned glass substrate using a cost-effective spray pyrolysis method at different substrate temperatures in the range of 350−500 °C. The X-ray diffraction studies confirmed that the sprayed thin films, which were deposited at different substrate temperatures, exhibit a cubic structure. The preferred orientation was aligned along the (222) orientation. Average crystallite size calculation based on the Scherrer formula indicates that the crystallite size increases with the enhancement of substrate temperature. FESEM analysis showed that the indium oxide thin films possess uniform grain distribution, which persists over the entire substrate. As the substrate temperature is increased, a partial agglomeration in the film morphology was observed. The deposited film's nanostructured nature was confirmed by transmission electron microscopy, and the polycrystalline nature was confirmed from the selected area electron diffraction pattern. Root mean square roughness of the samples was determined from the atomic force microscopy studies. From the Raman spectra, characteristic vibrational modes appeared at 558.61, 802.85, and 1097.18 cm −1 in all the samples, which confirms the cubic structure of indium oxide thin films. Photoluminescence emission spectra have been recorded with an excitation wavelength of 280 nm. The optical band gap was measured using the Tauc plot. The band gap was found to decrease with an increase in the substrate temperature. The gas-sensing performance of indium oxide films sprayed at various substrate temperatures has demonstrated a better response toward 50 ppm toluene gas at room temperature with good stability, and the response and recovery times were determined using a transient response curve.

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“…11 The optical band gap (E g ) of indium oxide thin films sprayed at various substrate temperatures is determined by adopting the Tauc expression using the absorption spectra. 37…”

Section: ■ Introductionmentioning

confidence: 99%

Nanostructured Indium Oxide Thin Films as a Room Temperature Toluene Sensor

Dasari

Nagaraju²,

Vijayakumar

et al. 2021

ACS Omega

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“…This shift represents a strain produced on the host lattice during the deposition. Strain caused by crystal imperfections and distortion has been determined by the Williamson-Hall relation . The calculated strain is tabulated in Table . ε = βcosθ 4 …”

Section: Resultsmentioning

confidence: 99%

“…Strain caused by crystal imperfections and distortion has been determined by the Williamson-Hall relation. 37 The calculated strain is tabulated in Table 2 . …”

Section: Resultsmentioning

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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“…Synthesis, deposition, fabrication of ZnO sensor and the characterization study of ZnO as thin-film sensing layer is discussed in detail in our previous paper [8,9].…”

Section: Resultsmentioning

confidence: 99%

Real-time detection of 1-butanol VOCin an indigenously developed Gas chamber

Bhat

Kumar

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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In this paper, we discuss the sensing studies of 1-butanol volatile organic compound (VOC) in an indigenously developed gas chamber. Designing of the portable gas chamber is discussed with the integration of thin-film ZnO sensor on an Inter-digitated electrodefabricated on a flexible Teflon substrate. Exposure of 1-butanol VOC inside the chamber causes a change in the resistance of the ZnO thin film. This change in the resistance is converted to voltage with a Wheatstone bridge network and an instrumentation amplifier circuit designed using precision components.The sensitivity of the sensor for 50 ppm and 100 ppm of 1-butanol is tested at room temperature (27°C) and the results are compared with our early studies using Keithley instruments.

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Fabrication of ultrasensitive hexagonal disc structured ZnO thin film sensor to trace nitric oxide

Cited by 10 publications

References 52 publications

Nanostructured Indium Oxide Thin Films as a Room Temperature Toluene Sensor

Nanostructured Indium Oxide Thin Films as a Room Temperature Toluene Sensor

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

Real-time detection of 1-butanol VOCin an indigenously developed Gas chamber

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