Tunneling-induced negative permittivity in Ni/MnO nanocomposites by a bio-gel derived strategy

Xie, Peitao; Li, Yifan; Hou, Qing; Sui, Kunyan; Liu, Chun-Zhao; Fu, Xueyan; Zhang, Jiaoxia; Murugadoss, Vignesh; Fan, Jincheng; Wang, Yanpeng; Fan, Runhua; Guo, Zhanhu

doi:10.1039/c9tc06378a

Cited by 176 publications

(72 citation statements)

References 77 publications

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“…Thus, as can be seen in Table 3 , for all nanocomposites, the exponential parameter n lies in the range of 0 ≤ n ≤ 1, which is typical for disperse systems with a hopping mechanism of charge transfer [ 43 , 56 , 57 , 58 , 59 , 60 ]. Since the frequency dependence on the AC conductivity of nanocomposites shows an increase with the growth in current frequency, it can be argued that the effect of tunneling is minimal.…”

Section: Resultsmentioning

confidence: 88%

“…Frequency dependence on the AC conductivity of Fe 3 O 4 /SWCNT/PDPAC nanocomposites was studied in the frequency range of 0.1 Hz–1.0 MHz ( Figure 9 ). According to [ 56 , 57 , 58 ], the frequency dependence on the conductivity (σ ac ) is described by evaluation: σ ac = σ dc + Aω n , where ω = 2πf is the angular frequency, σ dc —the frequency independent (dc) part of conductivity, n —the exponential parameter (0 ≤ n ≤ 1), A —the thermally activated quantity. A and n depend on the temperature and the volume fraction of the conducting component.…”

Section: Resultsmentioning

confidence: 99%

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Hybrid Electromagnetic Nanomaterials Based on Polydiphenylamine-2-carboxylic Acid

et al. 2020

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Hybrid ternary nanomaterials based on conjugated polymer polydiphenylamine-2-carboxylic acid (PDPAC) (poly-N-phenylanthranilic acid), Fe3O4 nanoparticles and single-walled carbon nanotubes (SWCNT) were prepared for the first time. Polymer–metal–carbon Fe3O4/SWCNT/PDPAC nanocomposites were synthesized via in situ oxidative polymerization of diphenylamine-2-carboxylic acid (DPAC) by two different ways: in an acidic medium and in the interfacial process in an alkaline medium. In an alkaline medium (pH 11.4), the entire process of Fe3O4/SWCNT/PDPAC-1 synthesis was carried out in one reaction vessel without intermediate stages of product extraction and purification. In an acidic medium (pH 0.3), to prepare the Fe3O4/SWCNT/PDPAC-2 nanocomposites, prefabricated magnetite nanoparticles were deposited on the surface of obtained SWCNT/PDPAC-2. The phase composition of the nanocomposites does not depend on the synthesis reaction medium pH. The influence of the reaction medium pH on the structure, morphology, thermal, magnetic, and electrical properties of the obtained ternary nanocomposites was studied.

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Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Hybrid Electromagnetic Nanomaterials Based on Polydiphenylamine-2-carboxylic Acid

et al. 2020

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“…3g and Supplementary Movie 2), the conductivity and stiffness of the carbon N-net membranes (pyrolysis at 1000°C) remained almost unchanged, maintaining high levels of~900 S cm −1 and 8.8 mN (Fig. 3h), indicating promising application for flexible metacomposites [44][45][46] .…”

Section: Resultsmentioning

confidence: 96%

Multi-functional flexible 2D carbon nanostructured networks

Zhang

Liu

et al. 2020

Nat Commun

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Two-dimensional network-structured carbon nanoscale building blocks, going beyond graphene, are of fundamental importance, and creating such structures and developing their applications have broad implications in environment, electronics and energy. Here, we report a facile route, based on electro-spraying/netting, to self-assemble two-dimensional carbon nanostructured networks on a large scale. Manipulation of the dynamic ejection, deformation and assembly of charged droplets by control of Taylor cone instability and micro-electric field, enables the creation of networks with characteristics combining nanoscale diameters of one-dimensional carbon nanotube and lateral infinity of two-dimensional graphene. The macro-sized (meter-level) carbon nanostructured networks show extraordinary nanostructural properties, remarkable flexibility (soft polymeric mechanics having hard inorganic matrix), nanoscale-level conductivity, and outstanding performances in distinctly different areas like filters, separators, absorbents, and wearable electrodes, supercapacitors and cells. This work should make possible the innovative design of high-performance, multi-functional carbon nanomaterials for various applications.

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“…This abrupt augmentation of thermal conductivity is definitely unambiguous evidence of the percolation threshold, which was situated in the range of 0.5-1.0 wt% of filler loading. [13,27] 3.4 | Mechanical behavior…”

Section: Thermal Properties Of the Synthesized Nanocompositesmentioning

confidence: 99%

Synthesis and design of polyurethane and its nanocomposites derived from canola‐castor oil: Mechanical, thermal and shape memory properties

Dehghan

Noroozi

Sadeghi

et al. 2020

Journal of Polymer Science

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The recent global pandemic and its tremendous effect on the price fluctuations of crude oil illustrates the side effects of petroleum dependency more evident than ever. Over the past decades, both academic and industrial communities spared endless efforts in order to replace petroleum-based materials with bioderived resources. In the current study, a series of shape memory polymer composites (SMPC's) was synthesized from epoxidized vegetable oils, namely canola oil and castor oil fatty acids (COFA's) as a 100% bio-based polyol and isophorone diisocyanate (IPDI) as an isocyanate using a solvent/catalyst-free method in order to eventuate polyurethanes (PU's). Thereafter, graphene oxide (GO) nanoplatelets were synthesized and embedded in the neat PU in order to overcome the thermomechanical drawbacks of the neat matrix. The chemical structure of the synthesized components, as well as the dispersion and distribution levels of the nanoparticles, was characterized. In the following, thermal and mechanical properties as well as shape memory behavior of the specimens were comprehensively investigated. Likewise, the thermal conductivity was determined. This study proves that synthesized PU's based on vegetable oil polyols, including graphene nanoparticles, exhibit proper thermal and mechanical properties, which make them stand as a potential candidate to compete with traditional petroleum-based SMPC's.

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Tunneling-induced negative permittivity in Ni/MnO nanocomposites by a bio-gel derived strategy

Abstract: Tunneling-induced negative permittivity is attributed to the low frequency plasmonic state in tunneling networks, where nickel nanoparticles are still isolated geometrically but connected electrically.

Cited by 176 publications

References 77 publications

Hybrid Electromagnetic Nanomaterials Based on Polydiphenylamine-2-carboxylic Acid

Hybrid Electromagnetic Nanomaterials Based on Polydiphenylamine-2-carboxylic Acid

Multi-functional flexible 2D carbon nanostructured networks

Synthesis and design of polyurethane and its nanocomposites derived from canola‐castor oil: Mechanical, thermal and shape memory properties

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