Effect of tungsten doping on the ammonia vapour sensing ability of ZnO thin films prepared by a cost effective simplified spray technique

Ravichandran, K.; Santhosam, A. Jansi; Sridharan, M.

doi:10.1016/j.surfin.2019.100412

Cited by 24 publications

(8 citation statements)

References 39 publications

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“…Among these, chemoreceptive-based metal oxide semiconductors (MO x ) have received tremendous interest in gas sensing due to their high surface/volume ratio, as the gas reaction process is a surface phenomenon. Different MO x , such as ZnO, SnO 2 , WO 3 , and TiO 2 [4,5] have been extensively studied for gas-sensing applications. Tungsten oxide (WO 3 ) has emerged as a potential MO x to detect the gases, such as NH 3 , H 2 , NO 2 , CO, and alcohol vapors, because of their inherent properties, including excellent electrical conductivity, sensitivity, and selectivity [6,7].…”

Section: Introductionmentioning

confidence: 99%

Impact of Ag on the Limit of Detection towards NH3-Sensing in Spray-Coated WO3 Thin-Films

Anusha

Ani

Poornesh

et al. 2022

Sensors

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Ag-doped WO3 (Ag–WO3) films were deposited on a soda-lime glass substrate via a facile spray pyrolysis technique. The surface roughness of the films varied between 0.6 nm and 4.3 nm, as verified by the Atomic Force Microscopy (AFM) studies. Ammonia (NH3)-sensing measurements of the films were performed for various concentrations at an optimum sensor working temperature of 200 °C. Enrichment of oxygen vacancies confirmed by X-ray Photoelectron Spectroscopy (XPS) in 1% Ag–WO3 enhanced the sensor response from 1.06 to 3.29, approximately 3 times higher than that of undoped WO3. Limit of detection (LOD) up to 500 ppb is achieved for 1% Ag–WO3, substantiating the role of Ag in improving sensor performance.

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Section: Introductionmentioning

confidence: 99%

Impact of Ag on the Limit of Detection towards NH3-Sensing in Spray-Coated WO3 Thin-Films

Anusha

Ani

Poornesh

et al. 2022

Sensors

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“…The QCM method offers high sensitivity and selectivity with a diverse range of appropriate coatings . The ammonia sensors based on QCM have been well studied by utilizing various sensing materials, e.g., polymers and metal oxides. − In this case, nanostructured materials are often preferable for their extremely high specific surface-area-to-volume ratios. , …”

Section: Introductionmentioning

confidence: 99%

Quartz Crystal Microbalances Functionalized with Citric Acid-Doped Polyvinyl Acetate Nanofibers for Ammonia Sensing

Roto

Rianjanu

Rahmawati

et al. 2020

ACS Appl. Nano Mater.

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We fabricated highly sensitive and selective ammonia gas sensors based on quartz crystal microbalance (QCM) platforms that were functionalized with electrospun polyvinyl acetate (PVAc) nanofibers and doped with various organic acids (i.e., oxalic, tartaric, and citric acids). The structural and chemical surface conditions of the nanofiber-based active layers on top of the QCMs were confirmed by scanning electron microscopy (SEM), atomic force microscopy (AFM), and Fourier-transform infrared (FTIR) spectroscopy. The sensitivity of the PVAc nanofiber-based QCM sensor doped with citric acid was found to be the highest (2.95 Hz/ppm) among others with a limit of detection (LOD) of down to the subppm level (550 ppb). It also exhibited good selectivity, rapid response, short recovery time, and decent repeatability. This simple yet low-cost alternative solution based on chemical modification of nanofibers could improve the performance of QCM-based ammonia gas sensors in many areas including for smart electronic nose applications.

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“…Therefore, exploring the physical nature behind, it may provide some effective strategies for optimizing optical and electrical performance of ZnO-based TCO material. Studies on ZnO thin film prepared by atomic layer deposition [18], sol-gel [19], spray pyrolysis [20], chemical vapor deposition [21] and sputtering [22] strongly support the relationship between the deposition technique and the quality of the film. Amongst them, sputtering is the most efficient method of producing high quality and low cost ZnO-based thin films.…”

Section: Introductionmentioning

confidence: 86%

Ca-Doped ZnO:Al Thin Films: Synthesis and Characterization

et al. 2021

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We unveiled the effect of doping on the morpho-structural and opto/electrical properties of Ca-doped ZnO:Al thin films obtained by RF magnetron sputtering. Scanning electron microscopy (SEM) was performed to reveal the surface morphology, while the composition and crystal structure were investigated by energy dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD). The correlation between the microstructure and the electrical conductivity identifies an increase in electrical conductivity up to 145 × 10−3 Ω−1·m−1 at 5 wt.% Ca doping level with the decrease in the grain size. Furthermore, the presence of Ca dopant triggers the occurrence of the emission peak at 430 nm and an increase of the green emission peak in PL spectra. Corroborating the electrical measurements with X-ray diffraction and optical measurements, one can infer that the electrical conductivity is dominated by intrinsic defects developed during deposition and by the existence of dopants.

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Effect of tungsten doping on the ammonia vapour sensing ability of ZnO thin films prepared by a cost effective simplified spray technique

Cited by 24 publications

References 39 publications

Impact of Ag on the Limit of Detection towards NH3-Sensing in Spray-Coated WO3 Thin-Films

Impact of Ag on the Limit of Detection towards NH3-Sensing in Spray-Coated WO3 Thin-Films

Quartz Crystal Microbalances Functionalized with Citric Acid-Doped Polyvinyl Acetate Nanofibers for Ammonia Sensing

Ca-Doped ZnO:Al Thin Films: Synthesis and Characterization

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