2022
DOI: 10.1021/acsanm.2c01993
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Coatings Comprised of Graphene Oxide Decorated with Helical Polypyrrole Nanofibers for Microwave Absorption and Corrosion Protection

Abstract: In recent years, microwave absorbing (MA) materials have developed rapidly and made good progress. However, MA materials with thin thickness and light weight are still a huge challenge. Furthermore, the application of single-function MA materials is severely restricted due to poor environmental adaptability in actual use, especially in harsh marine environments. Herein, we prepared graphene oxide/chiral polypyrrole hybrid (GO/CPPy) materials, which showed microwave absorbing properties combined with anticorros… Show more

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Cited by 15 publications
(9 citation statements)
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“…In order to further study, MA properties and electromagnetic characteristics of multiscale‐chiral hybrid materials, all PC x H‐ y ( x represents for concentration of chiral acids, x = 0.5, 1.0, and 2.0; y represents for weight ratio of ANi to HPPy, y = 0.5, 0.7, 1.0, and 1.3) samples were mixed with wax to obtain the frequency dependence of EM parameters through coaxial method. According to the transmission line theory, the relative data of complex permittivity (ε r = ε′‐jε′′) and complex permeability ( µ r = µ ′‐j µ ′′) could be further handled to calculate the reflection loss (RL) and effective absorption bandwidth (EAB), depending on the following formulas (Equations () and ()) [ 36–38 ] RLbadbreak=20log|ZinZ0Zin+Z0|\[ \begin{array}{*{20}{c}}{RL = 20\log \left| {\frac{{{Z_{{\rm{in}}}} - {Z_0}}}{{{Z_{{\rm{in}}}} + {Z_0}}}} \right|}\end{array} \] Zinbadbreak=Z0μr/εrtanh[j(2πfd/c)μrεr]\[ \begin{array}{*{20}{c}}{{Z_{{\rm{in}}}} = {Z_0}\sqrt {{\mu _{\rm{r}}}/{\varepsilon _{\rm{r}}}} \tanh \left[ {j\left( {2\pi fd/c} \right)\sqrt {{\mu _{\rm{r}}}{\varepsilon _{\rm{r}}}} } \right]}\end{array} \] where Z in and Z 0 , respectively, represent the input characteristic impedance at the interface between free space and absorbers and the impedance of free space. µ r and ε r refer to the relative complex permeability and permittivity.…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…In order to further study, MA properties and electromagnetic characteristics of multiscale‐chiral hybrid materials, all PC x H‐ y ( x represents for concentration of chiral acids, x = 0.5, 1.0, and 2.0; y represents for weight ratio of ANi to HPPy, y = 0.5, 0.7, 1.0, and 1.3) samples were mixed with wax to obtain the frequency dependence of EM parameters through coaxial method. According to the transmission line theory, the relative data of complex permittivity (ε r = ε′‐jε′′) and complex permeability ( µ r = µ ′‐j µ ′′) could be further handled to calculate the reflection loss (RL) and effective absorption bandwidth (EAB), depending on the following formulas (Equations () and ()) [ 36–38 ] RLbadbreak=20log|ZinZ0Zin+Z0|\[ \begin{array}{*{20}{c}}{RL = 20\log \left| {\frac{{{Z_{{\rm{in}}}} - {Z_0}}}{{{Z_{{\rm{in}}}} + {Z_0}}}} \right|}\end{array} \] Zinbadbreak=Z0μr/εrtanh[j(2πfd/c)μrεr]\[ \begin{array}{*{20}{c}}{{Z_{{\rm{in}}}} = {Z_0}\sqrt {{\mu _{\rm{r}}}/{\varepsilon _{\rm{r}}}} \tanh \left[ {j\left( {2\pi fd/c} \right)\sqrt {{\mu _{\rm{r}}}{\varepsilon _{\rm{r}}}} } \right]}\end{array} \] where Z in and Z 0 , respectively, represent the input characteristic impedance at the interface between free space and absorbers and the impedance of free space. µ r and ε r refer to the relative complex permeability and permittivity.…”
Section: Resultsmentioning
confidence: 99%
“…In order to further study, MA properties and electromagnetic characteristics of multiscale-chiral hybrid materials, all PCxH-y (x represents for concentration of chiral acids, x = 0.5, 1.0, and 2.0; y represents for weight ratio of ANi to HPPy, y = 0.5, 0.7, 1.0, and 1.3) samples were mixed with wax to obtain the frequency dependence of EM parameters through coaxial method. According to the transmission line theory, the relative data of complex permittivity (ε r = ε′-jε′′) and complex permeability (µ r = µ′-jµ′′) could be further handled to calculate the reflection loss (RL) and effective absorption bandwidth (EAB), depending on the following formulas (Equations ( 1) and ( 2)) [36][37][38] 20 log in 0 in 0…”
Section: Broadband Absorption Performance Of Multiscale-chiral Hybridsmentioning
confidence: 99%
“…The formation of asymmetric structures, such as twisted shapes, can often increase the energy of a system by exposing high-index facets, , which may lead to an unstable state of chiral inorganic NMs. Based on the chirality transfer strategy, it is also possible to explore ingenious protection designs, e.g., coating a robust protection layer, to ensure the stability of asymmetric structures within chiral inorganic NMs during the photo­(electro)­catalytic process, as well as the expression of chirality through the heterojunction from internal to external. Despite these exciting possibilities, constructing chiral hybrids presents significant challenges that need to be addressed.…”
Section: Challenges and Perspectivesmentioning
confidence: 99%
“…Meanwhile, the CNCs with low conductivity make the EMWs more likely to enter the absorber instead of being reflected. Also, it is the icing on the cake that in addition to the traditional forms of dielectric loss, the coupling between spiral CNCs and EMWs provides novel cross-polarization, giving a new inspiration to upgrade the absorption performance …”
Section: Introductionmentioning
confidence: 99%