Biominerals doped nanocrystalline nickel oxide as efficient humidity sensor: A green approach

Kennedy, L. John; Magesan, P.; Vijaya, J. Judith; Umapathy, M. J.; Aruldoss, Udaya

doi:10.1016/j.mseb.2014.07.008

Cited by 13 publications

(6 citation statements)

References 30 publications

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“…By using the same fabrication method, it can be said that this NiO nanoflower has a very high sensitivity value if compared with the ZnO-based humidity sensor produced by Ismail et al [13]. It might be due to the availability of the large surface area that intensified the diffusion of water vapors as well as facilitates the adsorption of water molecules during the sensing activity [14]. S = I max / I min (5) where I max and I min are the current values at 90%RH (highest humidity level) and 40%RH (initial humidity level), respectively.…”

Section: E Humidity Sensing Performancementioning

confidence: 91%

Highly Porous NiO Nanoflower based Humidity Sensor Grown on Seedless Glass Substrate via One Step Simplistic Immersion Method

Parimon¹,

Mamat²,

Ahmad³

et al. 2019

IJEAT

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A highly porous nickel oxide (NiO) nanoflower was deposited directly onto glass substrates by the simplistic immersion method. The nanostructural property of the NiO was studied by X-ray diffraction pattern and obtained high crystal quality after annealing at 500 °Ϲ with an average crystallite size of 15.5 nm. The optical characterization was measured by ultraviolet-visible spectroscopy, with an average transmittance of 58 %. The value of 3.63 eV was estimated and confirmed as NiO bandgap energy. The current-voltage measurement result indicates that the NiO nanoflower has good electrical properties with resistance, resistivity, and conductivity value of 2.31 MΩ, 2.12 Ω.cm, and 4.71 × 10-1 S.cm-1 , respectively. The NiO is capable of performing satisfactorily as humidity sensor with a sensitivity of 138 with the response and recovery time were estimated at 389 s and 172 s, respectively. Besides, this sensor has stability at a humidity level of 40 - 90% relative humidity.

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Section: E Humidity Sensing Performancementioning

confidence: 91%

Highly Porous NiO Nanoflower based Humidity Sensor Grown on Seedless Glass Substrate via One Step Simplistic Immersion Method

Parimon¹,

Mamat²,

Ahmad³

et al. 2019

IJEAT

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show abstract

“…Therefore, the surface area of the nanosheets is expected to provide more adsorption of water molecules when exposed to humidity sensing activity. According to clarification from Kennedy et al [13], the enhancement of sensing properties strongly depends on the surface properties which works on the principle of chemical and physical adsorption of water on the surface. For this reason, different annealing temperature plays an important role in determining the morphology and structural properties of NiO nanosheet films thus determining different performance against humidity sensors.…”

Section: Surface Morphological Characterizationmentioning

confidence: 99%

“…NiO exhibits the p-type conductivity and can be characterized by its high thermal stability and good chemical stability [3,11,12]. It shows the characteristics of high surface to volume ratio, and good optical transparency and electrical conductivity [3,13]. Besides, the unique structure of nanostructured NiO substances could facilitate interesting characteristics and performance of the fabricated sensor.…”

Section: Introductionmentioning

confidence: 99%

Influence of annealing temperature on the sensitivity of nickel oxide nanosheet films in humidity sensing applications

Parimon

Mamat

Ismail

et al. 2020

IJEECS

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Nickel oxide (NiO) nanosheet films were successfully grown onto NiO seed-coated glass substrates at different annealing temperatures for humidity sensing applications. NiO seed layers and NiO nanosheet films were prepared using a sol-gel spin coating and sonicated sol-gel immersion techniques, respectively. The properties of NiO nanosheet films at as-deposited, 300 ℃, and 500 ℃-annealed were examined by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), ultraviolet-visible (UV-vis) spectroscopy, and humidity sensor measurement system. The XRD patterns demonstrate that the grown NiO films have crystalline cubic structures at temperature of 300 ℃ and 500 ℃. The FESEM images show that the large porous nanosheet network spread over the layers as the annealing temperature increased. The UV-vis spectra revealed that all the nanosheet films have the average transmittance below than 50% in the visible region, with absorption edges ~ 350 nm. The optical band gap energy was evaluated in ranges of 3.39 to 3.61 eV. From the obtained humidity sensing results, it shows that 500 ℃-annealed film exhibited the best sensitivity of 257, as well as the slowest response time, and the fastest recovery time compared with others.

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“…The average crystallite size, lattice parameters and strain values obtained from the XRD pattern and Williamson-Hall plots are given in Table 1. The negative value of strain implies a compressive strain in lattice [27,28] which decreases (in magnitude) with increasing Co co-doping concentration. As the doping concentration increases, the decrease of the full width half maxima of the diffraction peaks results in the decrease of slope, indicating the strain in the SnO 2 :Cr host lattice decreases gradually.…”

Section: Methodsmentioning

confidence: 99%

Influence of Co co-doping on structural, optical and magnetic properties of SnO2:Cr nanoparticles

Subramanyam

Sreelekha

Reddy

et al. 2015

Superlattices and Microstructures

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Biominerals doped nanocrystalline nickel oxide as efficient humidity sensor: A green approach

Cited by 13 publications

References 30 publications

Highly Porous NiO Nanoflower based Humidity Sensor Grown on Seedless Glass Substrate via One Step Simplistic Immersion Method

Highly Porous NiO Nanoflower based Humidity Sensor Grown on Seedless Glass Substrate via One Step Simplistic Immersion Method

Influence of annealing temperature on the sensitivity of nickel oxide nanosheet films in humidity sensing applications

Influence of Co co-doping on structural, optical and magnetic properties of SnO2:Cr nanoparticles

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