Facile fabrication of multilayer films of graphene oxide/copper phthalocyanine with high dielectric properties

Wang, Zicheng; Wei, Renbo; Liu, Xiaobo

doi:10.1039/c5ra20022a

Cited by 13 publications

(7 citation statements)

References 40 publications

(63 reference statements)

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“…The three-dimensional (3D) layer-by-layer multilayer films of GO/ CuPc composites with a thickness of ∼0.1 mm were successfully fabricated by self-assembling in the orientation liquid crystalline state as a precursor and immobilizing the ordered structure upon simple casting and drying as reported by our previous work. 17 A compact layer-by-layer configuration can be confirmed by scanning electron microscopy (SEM) as shown in Figure 1a and b. To prepare highly fluffy ordered layer-by-layer nitrogen-doped graphene multilayer films, indispensable thermal annealing for achieving the effective reduction of GO nanosheets and pyrolysis of nitrogen-enriched CuPc molecules were employed at high temperature.…”

Section: Resultsmentioning

confidence: 91%

“…Multilayer films of graphene oxide/copper phthalocyanine were prepared as reported. 17 The homogeneous liquid crystal dispersions of GO/CuPc (100 mg of GO and 50 mg of CuPc) in NMP were cast on a clean preheated glass of quartz plate (30 mm × 30 mm), and the solvent was evaporated using a sequential mode of temperature programmed at 80, 100, 120, 140, 160, 180, and 200 °C for 2 h, respectively. The obtained layer-by-layer GO/CuPc multilayer films (labeled as GO/CuPc) loaded on the quartz plate were annealed at a higher temperature of 800 °C for 3, 6, and 9 h under the nitrogen atmosphere, which can be marked as NG-3h, NG-6h, and NG-9h, respectively.…”

Section: Methodsmentioning

confidence: 99%

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Fluffy and Ordered Graphene Multilayer Films with Improved Electromagnetic Interference Shielding over X-Band

Wang

Wei

Liu

2017

ACS Appl. Mater. Interfaces

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Highly ordered nitrogen-doped graphene multilayer films with large interlayer void are successfully fabricated by thermal annealing of the compact stacking graphene oxide/copper phthalocyanine (GO/CuPc) multilayer films. Scanning electron microscopic (SEM), X-ray diffraction (XRD), Raman, X-ray photoelectron spectroscopic (XPS), and electrical conductivity measurements indicate that the breakaway of oxygen functional groups on/in the GO sheets at high temperature and the in situ pyrolysis of CuPc molecules in the interlayer of graphene sheets synergistically facilitate the restoration of GO in graphitization, the effective nitrogen doping by replacing carbon atoms in graphene frameworks, the retention of layer-by-layer stacking structure of graphene sheets in plane, and the formation of interlayer voids, leading to the enhancement in the electrical conductivity (3.64 × 10 S/m). In addition, due to the formation of a Fabry-Pérot resonance cavity in the unique layer-by-layer stacking structure with larger interlayer voids, constructive interference of internal reflections aligned between parallel reflecting planes endows the fluffy graphene multilayer films with excellent electromagnetic interference (EMI) shielding effectiveness (exceeds 25 dB in all X-bands). The optimal shielding effectiveness is up to 55.2 dB with a smaller thickness of 0.47 mm, which makes it possible to become a practical EMI shielding material with a distinct competitive advantage.

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Section: Resultsmentioning

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Fluffy and Ordered Graphene Multilayer Films with Improved Electromagnetic Interference Shielding over X-Band

Wang

Wei

Liu

2017

ACS Appl. Mater. Interfaces

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“…Graphene shows a wide range of applications: composite materials, , catalysis, energy, electromagnetic protection, etc. Macroscopic paper-like graphene sheets with exceptional mechanical properties and electrical conductivity have received significant attention, which is expected to be used in the fields of aerospace and flexible electronics, , such as supercapacitors, , nanogenerators, water treatment, − lithium ion batteries, , sensors, − and electromagnetic wave shielding. , However, the mechanical properties of two-dimensional graphene materials are poor due to the weak mutual bonding force, which limits their application. Therefore, enhancing the properties of paper-like graphene sheets is particularly important, which is mainly solved by optimizing the assembly of graphene sheets.…”

Section: Introductionmentioning

confidence: 99%

Ultrastrong Carbon Nanotubes/Graphene Papers via Multiple π–π Cross-Linking

Wang

Meng

Huang

et al. 2020

ACS Appl. Mater. Interfaces

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Considering the extraordinary properties of graphene nanosheets, graphene-based materials from a molecular level to a macroscopic level as paper-like graphene films have recently grown for promising applications in many fields. However, there is still a major challenge in the design of the interface between adjacent graphene nanosheets so as to achieve high strength, high toughness, and high conductivity. Herein, we construct the highperformance graphene-based papers by using graphene as the matrix, carbon nanotubes (CNTs) as the reinforcement, and a long-chain molecule (1-pyrenylbutyric acid−linear diamine−1pyrenylbutyric acid, PBA-diamine-PBA) as the bridging agent. The multiple π−π interactions between the fused rings, graphene nanosheets, and CNTs are generated among the aromatic rings of PBA, rGO, and CNTs, which significantly improve the mechanical properties and electrical properties of the cross-linked composite papers (abbreviated to CLP-X, where X is the carbon chain length). Furthermore, the linear diamines with different lengths of carbon chain affect the properties of papers after cross-linking. Especially, the as-obtained graphene-based paper (CLP-6) shows a high tensile strength (625.2 MPa), high toughness (28.5 MJ/m 3 ), and high electrical conductivity (233.4 S/cm) as well as high solvent stability, which maintains the premium stability in different solvents. The improvement of strengthening and toughening mainly comes from the effective stress transfer and the reduction of slipping distance between rGO and CNTs during the stretching, with the help of multiple π−π cross-linking by in situ Raman analysis and simulation calculations. In addition, the high electrical conductivity leads to an excellent electromagnetic interference shielding capability (44,502 dB•cm 2 /g). The distinguished electric heating performance with rapid response to temperature changes is also recognized. Therefore, the proposed interface design is demonstrated as an effective way for developing a graphene-based paper with superior properties.

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“…Most Pc derivatives are susceptible to energy or electron transfer processes due to the presence of π‐electron conjugated ring system and consequently exhibit exceptionally high dielectric constant with an order corresponding to 10 4 , which finds useful as a dielectric filler for dielectric composites. Recently, Pc‐grafted CNTs have been reported to exhibit outstanding dielectric properties as conductive fillers for composites, in which Pc were decorated with either amino or hyper branched substituents with respect to their approaches …”

Section: Introductionmentioning

confidence: 99%

“…Recently, Pc-grafted CNTs have been reported to exhibit outstanding dielectric properties as conductive fillers for composites, in which Pc were decorated with either amino or hyper branched substituents with respect to their approaches. [20][21][22][23][24][25][26] There have previously reported that the solubility and compatibility of Pcs are effectively modulated when solubilityenhancing substituents were introduced into the peripheral of a Pc ring as a result of reduced intermolecular aggregation effect. [27][28][29][30][31] Herein, following this line of thought, we present the synthesis and applications of alkylated and perfluorinated Pc derivatives for covalent functionalization of CNTs, in order to further address such critical requirements for dispersion and adhesive properties of CNTs inside the polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Alkylated and Perfluorinated ZnPc‐modified Carbon Nanotubes and their Application as Conductive Fillers for Poly(vinylidene fluoride) Composite Dielectrics

Hong

Mutyala

Joo

et al. 2017

Bulletin Korean Chem Soc

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This study includes the synthesis and application of unsymmetrical zinc phthalocyanines (ZnPcs) 1 and 2 with three tertiary‐butylated (tBu) and hexyl‐tridecafluoro (C6F13) groups that are further connected with carbon nanotubes (CNTs) through an amide bonding to yield Pc‐functionalized CNTs 3 and 4, respectively. The properties of the resulting Pc‐CNT complexes are thoroughly investigated using various analytical techniques, revealing that 3 and 4 enhanced the dispersion and adhesion properties of the CNTs to poly(vinylidene fluoride) (PVDF) matrix, and thereby improved the electrical and dielectric properties. Particularly, the presence of long and fluorinated substituents in 4 allowed for better interfacial compatibility compared to alkylated Pc‐CNT 3, leading to more stable dielectric behaviors. Our work has demonstrated that perfluorinated and alkylated Pc‐CNT complex could be facile and effective approach toward high‐performance polymer‐based dielectrics.

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Facile fabrication of multilayer films of graphene oxide/copper phthalocyanine with high dielectric properties

Abstract: Novel multilayer films of graphene oxide/copper phthalocyanine (GO/CuPc) were fabricated by self-assembling in the orientational ordered liquid crystalline state and immobilizing of the ordered structure upon casting and drying.

Cited by 13 publications

References 40 publications

Fluffy and Ordered Graphene Multilayer Films with Improved Electromagnetic Interference Shielding over X-Band

Fluffy and Ordered Graphene Multilayer Films with Improved Electromagnetic Interference Shielding over X-Band

Ultrastrong Carbon Nanotubes/Graphene Papers via Multiple π–π Cross-Linking

Preparation of Alkylated and Perfluorinated ZnPc‐modified Carbon Nanotubes and their Application as Conductive Fillers for Poly(vinylidene fluoride) Composite Dielectrics

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