Polyaniline/γ-Fe2O3 nanocomposite for room temperature LPG sensing

In the present work, Polyaniline (PANI) and Polyaniline-Titanium dioxide (PANI-TiO 2 ) composite have been synthesized separately by chemical polymerization of aniline without/with TiO 2 . Characteristic absorption bands of PANI and TiO 2 in the composite were confirmed by FT-IR studies, indicating the interaction of PANI with TiO 2 . Comparative study of XRD patterns of PANI and the composite confirmed superficial deposition of PANI on TiO 2 and the average size of the composite particle was found to be 25 nm. The aggregated granular porous morphology of the composite was confirmed by its SEM image. The composite's sensing response to humidity at room temperature was tested and was found to be 84.21 % in the range 25 % -95 % RH. The response and recovery time of the composite at 95 % RH were measured to be 60s and 100s respectively and its sensing stability over a period of one month was also confirmed.

show abstract

“…The sensing response of the composite for various % RH are measured at 100 Hz using fractional base line manipulation method [34] using Eq. (3):…”

Section: Humidity Sensing Response Studiesmentioning

confidence: 99%

Polyaniline-Titanium dioxide composite as humidity sensor at room temperature

Kotresh¹,

Ravikiran²,

Raj³

et al. 2016

Nanosystems: Phys. Chem. Math.

View full text Add to dashboard Cite

show abstract

“…Many reports are available on the development of the LPG sensors that operate at room temperature, the reduction of the MOS size [6,7], and the mixing of MOS with metal nanoparticles [8] including the fabrication of heterojunctions [4,[9][10][11], which is one of the most strategies used. Due to the mixing of MOS and other materials, it formed a variety of the unique properties for sensing material, such as a change in conductance, improved surface catalytic property, increasing surface reaction sites, and producing a high porosity [12].…”

Section: Introductionmentioning

confidence: 99%

Fast-LPG Sensors at Room Temperature by α-Fe₂O₃/CNT Nanocomposite Thin Films

Chaitongrat

Chaisitsak

2018

Journal of Nanomaterials

View full text Add to dashboard Cite

We present performance of a room temperature LPG sensor based on -Fe 2 O 3 /CNT (carbon nanotube) nanocomposite films. The nanocomposite film was fabricated via the metallic Fe catalyst particle on CNTs in which both the catalyst particles and the CNT were simultaneously synthesized by chemical vapor deposition (CVD) synthesis and were subsequently annealed in air to create -Fe 2 O 3 . These methods are simple, inexpensive, and suitable for large-scale production. The structure, surface morphologies, and LPG response of nanocomposite films were investigated. Raman spectroscopy and XPS analysis showed the formation of -Fe 2 O 3 on small CNTs (SWNTs). Morphological analysis using FE-SEM and AFM revealed the formation of the porous surface along with roughness surface. Additionally, the sensing performance of -Fe 2 O 3 /CNTs showed that it could detect LPG concentration at lower value than 25% of LEL with response/recovery time of less than 30 seconds at room temperature. These results suggest that the -Fe 2 O 3 /CNTs films are challenging materials for monitoring LPG operating at room temperature.

show abstract

“…[1][2][3][4][5][6][7] Over the decade, there has been a steady progress in the applications of conjugated conducting polymers (CPs) such as in chemical sensors, electrochemical supercapacitors, electro chromic and photovoltaic devices, light-emitting diodes and batteries. The years in the last decade have also witnessed consistent efforts by researchers in improving the physical and structural properties of CPs.…”

Section: Introductionmentioning

confidence: 99%

“…The years in the last decade have also witnessed consistent efforts by researchers in improving the physical and structural properties of CPs. 1,[5][6][7][8][9][10][11][12] The physical and structural attributes of CPs are generally affected by crucial parameters such as polymerization method, type of the oxidant, pH and temperature conditions during polymerization, etc. In recent times, however, tuning of CPs' properties has also been attempted by use of nanomaterials.…”

Section: Introductionmentioning

confidence: 99%

“…Selection of appropriate nanomaterial for a CP is crucial to the ultimate application of the resulting nanocomposites, which is generally a result of the synergistic effect between the CP and the nanomaterial. 5,7,[12][13][14] Using nanotechnology, various macromolecules and nanomaterials have been used for gas sensing purposes 15,16 and amongst them metal oxides 17,18 and CPs 19 are most widely used. A silver nanocrystal has been reported as a promoter for carbon nanotube-based gas sensors at room-temperature.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Polypyrrole/Metal Sulphide Hybrid Nanocomposites: Synthesis, Characterization and Room Temperature Gas Sensing Properties

et al. 2016

Self Cite

View full text Add to dashboard Cite

The present research work explores the room temperature gas sensing ability of hybrid nanocomposites of metal sulphide nanoparticles with polypyrrole (PPy) matrix. Sonochemically synthesized both silver sulphide (Ag 2 S) and cadmium sulphide (CdS) nanoparticles were mixed in varying ratios with PPy matrix by in-situ oxidative polymerization route. The resulting PPy/(Ag 2 S:CdS) hybrid nanocomposites were analyzed by characterizing them using FTIR and UV-Visible spectroscopy, XRD, SEM, fourprobe conductivity method and gas sensing ability by two-probe gas sensing setup. The current-voltage (I-V) characteristics of the PPy hybrid nanocomposites revealed their semiconducting nature with an electrical conductivity in the range of 10 −4 to 10 −3 S/cm. As compared to pure PPy, their hybrid PPy/ (Ag 2 S:CdS) nanocomposites showed an enhancement in sensitivity towards ammonia gas detection. The results clearly indicated a synergistic effect between the Ag 2 S:CdS nanoparticles and the PPy matrix.

show abstract

Polyaniline/γ-Fe2O3 nanocomposite for room temperature LPG sensing

Cited by 125 publications

References 37 publications

Polyaniline-Titanium dioxide composite as humidity sensor at room temperature

Polyaniline-Titanium dioxide composite as humidity sensor at room temperature

Fast-LPG Sensors at Room Temperature by α-Fe₂O₃/CNT Nanocomposite Thin Films

Polypyrrole/Metal Sulphide Hybrid Nanocomposites: Synthesis, Characterization and Room Temperature Gas Sensing Properties

Contact Info

Product

Resources

About

Polyaniline/γ-Fe2O3 nanocomposite for room temperature LPG sensing

Cited by 125 publications

References 37 publications

Polyaniline-Titanium dioxide composite as humidity sensor at room temperature

Polyaniline-Titanium dioxide composite as humidity sensor at room temperature

Fast-LPG Sensors at Room Temperature by α-Fe2O3/CNT Nanocomposite Thin Films

Polypyrrole/Metal Sulphide Hybrid Nanocomposites: Synthesis, Characterization and Room Temperature Gas Sensing Properties

Contact Info

Product

Resources

About

Fast-LPG Sensors at Room Temperature by α-Fe₂O₃/CNT Nanocomposite Thin Films