Synthesis and characterization of nanostructured MnO<sub>2</sub>–CoO and its relevance as an opto-electronic humidity sensing device

Sikarwar, Samiksha; Yadav, B. C.; Джардималиева, Г. И.; Golubeva, N. D.; Srivastava, Pankaj

doi:10.1039/c8ra01975d

Cited by 19 publications

(4 citation statements)

References 40 publications

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“…This study can have a general validity for all the nanostructured metal oxides used for RH sensors, for which chemosorption is followed by multilayer physisorption and, finally, by water condensation in the micropores or mesopores. As already said, TiO 2 was selected as a subject of the study due to its well-known capability of adsorbing water vapor but also because TiO 2 nanoparticles have the advantage of a low cost and large availability since they are used for many other applications [2,[12][13][14][15]. Moreover, the effect of the addition of Au nanoparticles (5 nm) is investigated, which are selected to improve the water adsorption and to obtain improved transient response in terms of response and recovery times.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Au Nanoparticle Addition on Humidity Sensing with Ultra-Small TiO2 Nanoparticles

et al. 2021

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In this paper, we investigate humidity sensing through impedance measurements with TiO2 nanoparticles (about 6 nm in diameter). The transient behavior and the impedance spectra are measured and interpreted from the theoretical point of view. Large responses are shown especially in the relative humidity range from 30% to 80%, which are essentially explained by condensation in the nanopores. The effect of the addition of Au nanoparticles is investigated and as expected, the Au/TiO2 interfaces allow for dramatically reducing the sensing film response time and above all, its recovery time; moreover, it seems to favor condensation when the relative humidity overcomes 70%.

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Section: Introductionmentioning

confidence: 99%

The Effect of Au Nanoparticle Addition on Humidity Sensing with Ultra-Small TiO2 Nanoparticles

et al. 2021

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“…Metal oxide nanomaterials as a semiconductor material have unique physical and chemical properties and high sensitivity − and are often used in various sensor applications. Especially for cobalt oxide nanomaterials, due to their better hydrophilicity and optimized doping performance for composite materials, the use of cobalt oxide for humidity sensors has been reported. − Zhang et al introduced a flexible humidity sensor featuring three-dimensional hollow-structured cobalt oxide particles, which exhibited an impressive response time of 1 s and a recovery time of 13.5 s . Nonetheless, the intricate fabrication procedure associated with this sensor poses challenges for commercial-scale production.…”

Section: Introductionmentioning

confidence: 99%

Flexible Humidity Sensor Based on a Graphene Oxide–Carbon Nanotube-Modified Co₃O₄ Nanoparticle-Embedded Laser-Induced Graphene Electrode

Li,

Zhang,

Song

et al. 2024

ACS Appl. Mater. Interfaces

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To meet evolving humidity monitoring needs, the development of flexible, high-performance humidity sensors is crucial. This study introduces an innovative flexible humidity sensor using a single-step laser scribing technique to fabricate a flexible in situ Co 3 O 4 nanoparticle-embedded laser-induced graphene (Co 3 O 4 −LIG) composite electrode. Compared to conventional LIG electrodes, the Co 3 O 4 −LIG electrode exhibits improved conductivity and hydrophilicity, enhancing charge transfer and water molecule affinity. The unique two-dimensional structure and exceptional water permeability of graphene oxide (GO) combine with the rapid water response and high specific surface area of carboxylated multiwalled carbon nanotubes (MWCNTs), thereby assuming a crucial function in the modification and optimization of the performance of humidity sensors. Through the application of a homogenously blended aqueous solution comprising GO and MWCNTs in precise proportions onto the Co 3 O 4 −LIG composite electrode, an excellent humidity-responsive layer is established, culminating in the realization of a cutting-edge GO−MWCNTs@Co 3 O 4 −LIG flexible humidity sensor. Noteworthy attributes of this sensor include a heightened sensitivity [959.1% (ΔR/R 0 )], rapid response and recovery times (within 5 and 26 s, respectively), and a noteworthy linearity (R 2 = 0.994) across a relative humidity range of 14 to 95%. The findings presented herein offer valuable insights and a practical blueprint for the design and production of flexible humidity sensors.

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“…The results elucidated a linear behavior throughout a humidity range of 10 and 95% RH 52 . MnO 2 -CaO was also studied for humidity sensing and reporting an average sensitivity of ∼2.225 μW/% RH with a nominal response and recovery times of 47 and 59 s, respectively 53 .…”

Section: Introductionmentioning

confidence: 99%

Ternary nanocomposite comprising MnO2, GQDs, and PANI as a potential structure for humidity sensing applications

Morsy,

Gomaa,

Abd Elhamid

et al. 2023

Sci Rep

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Humidity sensing has been offering a noticeable contribution in different industrial, medical, and agricultural activities. Here, graphene quantum dots doped with polyaniline (PANI) and MnO2 were successfully prepared. The synthesized system is exposed to a set of structural, morphological, and optical investigations. The apparent crystallite size is less than 30 nm, reflecting the nanoscale of the structure, and thus validating the preparation route as evident on XRD pattern. SEM images show a fibrous structure where polyaniline dominates and covers most of the structure’s surface. The evident bands of the FTIR spectrum are designated to the component used in synthesis confirming the chemical structure of the fabricated system. The humidity sensing study of the synthesized structure is carried out through a wide range of relative humidity (RH) levels range of 11–97%. The response and recovery times of the fabricated structure are found to be around 120 and 220s, respectively.

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Synthesis and characterization of nanostructured MnO₂–CoO and its relevance as an opto-electronic humidity sensing device

Abstract: Metal carboxylates are widely used in science and technology and have been the subject of intense studies due to the practical importance of their products.

Cited by 19 publications

References 40 publications

The Effect of Au Nanoparticle Addition on Humidity Sensing with Ultra-Small TiO2 Nanoparticles

The Effect of Au Nanoparticle Addition on Humidity Sensing with Ultra-Small TiO2 Nanoparticles

Flexible Humidity Sensor Based on a Graphene Oxide–Carbon Nanotube-Modified Co₃O₄ Nanoparticle-Embedded Laser-Induced Graphene Electrode

Ternary nanocomposite comprising MnO2, GQDs, and PANI as a potential structure for humidity sensing applications

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Synthesis and characterization of nanostructured MnO2–CoO and its relevance as an opto-electronic humidity sensing device

Abstract: Metal carboxylates are widely used in science and technology and have been the subject of intense studies due to the practical importance of their products.

Cited by 19 publications

References 40 publications

The Effect of Au Nanoparticle Addition on Humidity Sensing with Ultra-Small TiO2 Nanoparticles

The Effect of Au Nanoparticle Addition on Humidity Sensing with Ultra-Small TiO2 Nanoparticles

Flexible Humidity Sensor Based on a Graphene Oxide–Carbon Nanotube-Modified Co3O4 Nanoparticle-Embedded Laser-Induced Graphene Electrode

Ternary nanocomposite comprising MnO2, GQDs, and PANI as a potential structure for humidity sensing applications

Contact Info

Product

Resources

About

Synthesis and characterization of nanostructured MnO₂–CoO and its relevance as an opto-electronic humidity sensing device

Flexible Humidity Sensor Based on a Graphene Oxide–Carbon Nanotube-Modified Co₃O₄ Nanoparticle-Embedded Laser-Induced Graphene Electrode