One-step synthesis, electromagnetic and microwave absorbing properties of α-FeOOH/polypyrrole nanocomposites

Xiao, Hong‐Mei; Zhang, Weidong; Fu, Shao‐Yun

doi:10.1016/j.compscitech.2010.02.002

Cited by 45 publications

(9 citation statements)

References 31 publications

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“…In this case, RL value around −44 dB at 8 GHz was observed for samples with thickness of 4 mm. A similar methodology was also employed to prepare PPy/PEDOT@α-FeOOH [91]. The best calculated RL value of −16.9 at 15.8 GHz was observed for the hybrid prepared with [Py]/[Fe 2+ ] of 1.0.…”

Section: Emi Se Of Icps-based Hybrid Materialsmentioning

confidence: 99%

Conducting Polymeric Composites Based on Intrinsically Conducting Polymers as Electromagnetic Interference Shielding/Microwave Absorbing Materials—A Review

2021

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The development of sophisticated telecommunication equipment and other electro-electronic devices resulted in a kind of electromagnetic pollution that affects the performance of other equipment as well as the health of human beings. Intrinsically conducting polymers (ICP), mainly polyaniline and polypyrrole, have been considered as promising candidates for applications in efficient electromagnetic interference shielding (EMI) due to their ease of preparation, light weight, good conductivity and corrosion resistance. One of the important advantages of these materials is the capability to interact with the EM radiation through both absorption and reflection mechanisms thus enlarging the field of application. In this context, this review article describes a recent overview of the existing methods to produce intrinsically conducting polymers and their blends for electromagnetic shielding application. Additionally, it highlights the relationship between preparation methods reported in the literature with the structure and properties, such as electrical conductivity, electromagnetic shielding effectiveness (EMI SE), complex permittivity and permeability of these materials. Furthermore, a brief theory related to the electromagnetic mechanism and techniques for measuring the microwave absorbing properties are also discussed.

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Section: Emi Se Of Icps-based Hybrid Materialsmentioning

confidence: 99%

Conducting Polymeric Composites Based on Intrinsically Conducting Polymers as Electromagnetic Interference Shielding/Microwave Absorbing Materials—A Review

2021

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“…Additionally, the mechanical force, provided by the compressed air flow through the inner part of the dual-nozzle, broke up the mixed PPy solution drops into small nanosized droplets; this reduced the likelihood of particle aggregation (Figure a,b). Finally, the Fe 3+ ions reacted with the hydroxide ions in the collector; thus, when the electrosprayed particles were collected in a solution containing NaOH, the Fe 3+ ions reacted with the hydroxide ions to form FeOOH particles, as described by the following reaction: , Fe 3 + + 3 OH − → FeOOH + normalH 2 normalO …”

Section: Resultsmentioning

confidence: 99%

Multidimensional Polypyrrole/Iron Oxyhydroxide Hybrid Nanoparticles for Chemical Nerve Gas Agent Sensing Application

et al. 2013

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Multidimensional FeOOH nanoneedle-decorated hybrid polypyrrole nanoparticles (PFFs) were fabricated using dual-nozzle electrospray and heat stirring process. To decorate metal oxide nanoneedles on the polypyrrole (PPy) surface, metal oxide particle-decorated PPys (E_PPy) were fabricated as starting materials. The E_PPy particles were prepared by dual-nozzle electrospray because ferric ions (Fe(3+)) dispersed on the surface reacted with hydroxide (OH(-)) ions in the collector solution without aggregation of each particles. Multidimensional hybrid PFFs with maximized surface area were then formed by heat stirring reaction in the aqueous metal precursor contained solutions. The decoration morphology of the metal oxide nanoneedles could be controlled by precursor concentration in the aqueous solution. These multidimensional hybrid PPFs were applied to nerve gas agent (DMMP) chemical sensor at room temperature with excellent sensitivity. The minimum detectable level (MDL) of PFFs was as low as 0.1 ppb, which is higher than that for a chemical sensor based on hybrid materials. This is because the metal oxide nanoneedles increase surface area and affinity to DMMP vapor.

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“…where Z is a complex number, " and m are the complex permittivity and permeability, respectively, is the wave length, t is the thickness of specimen, and j ¼ ffiffiffiffiffiffi ffi À1 p . [23][24][25] The conductivity of PPy synthesized at a high pH is superior, but has no good for the reflection loss in the experimental ranges. This is mainly because that a high conductivity is not beneficial to the formation of dipole and dielectric loss.…”

Section: Reflection Loss Analysismentioning

confidence: 99%

Control of morphology and electromagnetic properties of polypyrrole synthesized by the template method

Jiang

et al. 2015

High Performance Polymers

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This article presents a contribution to a better understanding of the effects of pH value on the morphology, conductivity, and reflection loss of polypyrrole (PPy) prepared at different pH values using indigo carmine (IC) as the synthesis template. The results indicate that the morphology of PPy changes from spiral rods to nonspiral rods, then to particles, which is attributed to the gradual morphological change of IC micelle templates from prismatic structure to rugby-like structure, and finally to spherical structure. Further study demonstrates that the conductivity of PPy decreases with the gradual decrease of the pH value, as a result of gradually increased contact resistance and the degree of electron delocalization. With the decrease of the pH value, the maximum reflection loss of PPy gradually increases and the corresponding loss peak moves to higher frequency points simultaneously.

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One-step synthesis, electromagnetic and microwave absorbing properties of α-FeOOH/polypyrrole nanocomposites

Cited by 45 publications

References 31 publications

Conducting Polymeric Composites Based on Intrinsically Conducting Polymers as Electromagnetic Interference Shielding/Microwave Absorbing Materials—A Review

Conducting Polymeric Composites Based on Intrinsically Conducting Polymers as Electromagnetic Interference Shielding/Microwave Absorbing Materials—A Review

Multidimensional Polypyrrole/Iron Oxyhydroxide Hybrid Nanoparticles for Chemical Nerve Gas Agent Sensing Application

Control of morphology and electromagnetic properties of polypyrrole synthesized by the template method

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