Gas and humidity sensors based on iron oxide–polypyrrole nanocomposites

Suri, Komilla; Annapoorni, S.; Sarkar, Anirban; Tandon, R. P.

doi:10.1016/s0925-4005(01)00966-2

Cited by 214 publications

(81 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Using the definition of sensitivity given by Suri et al, a sensitivity of 100 is obtained for a RH change of 65%. This compares favorably with those obtained in previous works, ~100 for a RH change of 75% in [33] and 138 for a RH change of 78% in [32] ( Table 2). Table 3 shows a comparison of the sensing performance of this sensor against other graphene-based humidity Reduced-GO 50 0.514 84 [19] GO-silicon bilayer 19 1.016 53 [20] sensors.…”

Section: Humidity Sensing Experimentssupporting

confidence: 90%

See 1 more Smart Citation

Room-Temperature Humidity Sensing Using Graphene Oxide Thin Films

Naik¹,

Krishnaswamy²

2016

Graphene

View full text Add to dashboard Cite

In this article, we report on a room-temperature humidity sensing device using graphene oxide (GO) thin films synthesized by chemical exfoliation. Changes in the device conductivity are measured for varying relative humidity in the experimental chamber. Experiments are carried out for relative humidity varying from 30% to 95%. We observe a difference in the results obtained for low relative humidity (<50%) and high relative humidity (>50%), and propose a sensing mechanism to explain this difference. Although the sensor exhibits some hysteresis at high relative humidities, a method to "reset" the sensor is also proposed. The sensing device has high sensitivity and fast response time.

show abstract

Section: Humidity Sensing Experimentssupporting

confidence: 90%

“…It is observed that the experimental data closely fits an exponential curve. Suri et al define sensitivity S as the ratio of resistance before humidity exposure and at a given RH [33]. This does not take in to account the actual change in RH for a given change in resistance.…”

Section: Humidity Sensing Experimentsmentioning

confidence: 99%

Room-Temperature Humidity Sensing Using Graphene Oxide Thin Films

Naik¹,

Krishnaswamy²

2016

Graphene

View full text Add to dashboard Cite

show abstract

“…In nonsurgical treatments of cancerous tumors, the heating is mainly achieved via magnetization relaxation in superparamagnetic state [2,3] or hysteresis-loss heating [4]. The sensing capability of iron oxide (especiallyFe 2 O 3 and organic -Fe 2 O 3 hybrid materials) in different gas sensors is a current research interest of many researchers [5][6][7][8][9][10]. The most common and interesting class of iron oxide are magnetite (Fe 3 O 4 ), maghemite ( -Fe 2 O 3 ), and hematite ( -Fe 2 O 3 ).…”

Section: Introductionmentioning

confidence: 99%

Simple Hydrolysis Synthesis of Uniform Rice-Shaped β-FeOOH Nanocrystals and Their Transformation to α-Fe₂O₃ Microspheres

Singh

Sharma

Kumar

et al. 2015

Indian Journal of Materials Science

View full text Add to dashboard Cite

In the synthesis of nanostructure materials a specific emphasis has been focused on the control of shape and orientation of nanocrystals to obtain prerequisite properties of the materials. Nanorice is a new hybrid nanoparticle prolate geometry of nanoshells with reduced symmetry having new exciting optical behavior. Rice-shaped -FeOOH nanocrystals have been synthesized by a simple hydrolysis chemical method using ferric aqueous solution and urea as surfactant. The successive calcination of -FeOOH nanocrystals at 650 ∘ C results in the formation of the porous -Fe 2 O 3 (hematite) microspheres. The as-synthesized yield ofFeOOH nanocrystals was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX), and optical spectroscopy. The successive transformation of rice-shaped -FeOOH nanostructures into porous -Fe 2 O 3 (hematite) microspheres through calcination process was confirmed by XRD, SEM, and EDAX studies. The water contact angle of as-prepared -Fe 2 O 3 microspheres shows hydrophobic behavior of the material.

show abstract

“…magnetic as well as conducting, have proved to be a useful material for many applications like electromagnetic shielding, gas and humidity sensors etc. [10]. Magnetic investigations on γ − F e 2 O 3 -PPY nanocomposites [11] reveal that the size and hence the magnetic properties can be controlled by varying the PPY content in the nanocomposite.…”

Section: Introductionmentioning

confidence: 99%

Composition dependent magnetic properties of iron oxide-polyaniline nanoclusters

Sharma

Lamba

Annapoorni

et al. 2004

Journal of Applied Physics

Self Cite

View full text Add to dashboard Cite

γ − F e2O3 prepared by sol gel process was used to produce nanocomposites with polyaniline of varying aniline concentrations. TEM shows the presence of chain like structure for lower polyaniline concentration. The room temperature hysteresis curves show finite coercivity of ∼ 160 Oe for all the composites, while the saturation magnetization was found to decrease with increasing polymer content. ZFC -FC magnetization measurements indicate high blocking temperatures. It is believed that this indicates a strongly interacting system, which is also shown by our TEM results. Monte Carlo simulations performed on a random anisotropy model with dipolar and exchange interactions match well with experimental results.

show abstract

Gas and humidity sensors based on iron oxide–polypyrrole nanocomposites

Cited by 214 publications

References 20 publications

Room-Temperature Humidity Sensing Using Graphene Oxide Thin Films

Room-Temperature Humidity Sensing Using Graphene Oxide Thin Films

Simple Hydrolysis Synthesis of Uniform Rice-Shaped β-FeOOH Nanocrystals and Their Transformation to α-Fe₂O₃ Microspheres

Composition dependent magnetic properties of iron oxide-polyaniline nanoclusters

Contact Info

Product

Resources

About

Gas and humidity sensors based on iron oxide–polypyrrole nanocomposites

Cited by 214 publications

References 20 publications

Room-Temperature Humidity Sensing Using Graphene Oxide Thin Films

Room-Temperature Humidity Sensing Using Graphene Oxide Thin Films

Simple Hydrolysis Synthesis of Uniform Rice-Shaped β-FeOOH Nanocrystals and Their Transformation to α-Fe2O3 Microspheres

Composition dependent magnetic properties of iron oxide-polyaniline nanoclusters

Contact Info

Product

Resources

About

Simple Hydrolysis Synthesis of Uniform Rice-Shaped β-FeOOH Nanocrystals and Their Transformation to α-Fe₂O₃ Microspheres