Tuning the Mechanical, Electrical, and Optical Properties of Flexible and Free-Standing Functionalized Graphene Oxide Papers Having Different Interlayer <i>d</i> Spacing

Márquez-Lamas, Uriel; Martínez‐Guerra, Eduardo; Toxqui-Terán, Alberto; Aguirre-Tostado, F. S.; Lara-Ceniceros, Tania E.; Bonilla‐Cruz, José

doi:10.1021/acs.jpcc.6b09961

Cited by 12 publications

(8 citation statements)

References 55 publications

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“…BFRGO exhibited a shift of the principal peak up to 6.8°, which indicates an increase in the interplanar distance up to d 002 = 13.2 Å. This exfoliation level was attributed to the presence of new nitrogen-centered functional groups . Also, a broad pick of low intensity at 22 and 13.2° ( d 002 = 4 and 6.7 Å, respectively) was observed and attributed to the restructuration of the basal plane during the functionalization and reduction process.…”

Section: Resultsmentioning

confidence: 93%

“…This exfoliation level was attributed to the presence of new nitrogen-centered functional groups. 43 Also, a broad pick of low intensity at 22 and 13.2°(d 002 = 4 and 6.7 Å, respectively) was observed and attributed to the restructuration of the basal plane during the functionalization and reduction process. Atomic force microscopy (AFM) analysis (Figure S3, Supporting Information) reveals the BFRGO decrease in the layer number compared to GO, owing to GO platelets having d 002 = 8 Å, and AFM reveals 5 nm as height.…”

Section: ■ Results and Discussionmentioning

confidence: 97%

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Super-Anticorrosive Materials Based on Bifunctionalized Reduced Graphene Oxide

Ramírez-Soria

León-Silva

Rejón-García

et al. 2020

ACS Appl. Mater. Interfaces

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The design of new materials with two or more functional groups must be strongly considered to achieve multifunctional coatings with outstanding properties such as active−passive protection against corrosion, low-friction, antifouling, and sensing, among others. In this sense, nanocomposites based on solvent-free epoxy resin/bifunctionalized reduced graphene oxide layers with NH 2 and NH 3 + groups (ER/BFRGO) with super-anticorrosive properties are for the first time reported here. The amine groups (−NH 2 ) act as cross-linker agents, which react with epoxy terminal groups from resin, thus closing the gap between the BFRGO layers and the polymeric matrix. Meanwhile, the ammonium ions (−NH 3 + ) are effective trapping agents of negatively charged atoms or molecules (e.g., Cl − ). This novel combination enables us to obtain nanocomposite coatings with passive−active protection against corrosion. ER/BFRGO deposited onto A36 mild steel exhibited a remarkably enhanced barrier against corrosion into a saline medium (1 M NaCl; 58.4 g/L), wherein the corrosion current density (i corr ) was diminished 6 orders of magnitude (i corr = 5.12 × 10 −12 A/ cm 2 ), with respect to A36 mild steel coated only with ER (i corr = 2.34 × 10 −6 A/cm 2 ). Also, the highest polarization resistance R p = 6.04 × 10 7 Ω/cm 2 was obtained, which represents the lowest corrosion rate and corresponds to 3 orders of magnitude higher than A36 mild steel coated with ER (R p = 1.43 × 10 4 Ω/cm 2 ). The strategy of bifunctionalization proposed herein to obtain bifunctionalized reduced GO with NH 2 and NH 3 + groups has not been disclosed in the literature before; in consequence, this work opens a new pathway toward the design of smart materials based on multifunctional nanomaterials.

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Section: Resultsmentioning

confidence: 93%

Section: ■ Results and Discussionmentioning

confidence: 97%

Super-Anticorrosive Materials Based on Bifunctionalized Reduced Graphene Oxide

Ramírez-Soria

León-Silva

Rejón-García

et al. 2020

ACS Appl. Mater. Interfaces

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“…Also, a thin sharp vibration at 1664 cm –1 was observed and assigned to the CN bond from the imine group. GO exhibited their characteristic O–H vibration appearing at 3300 cm –1 as a broad and intense signal. Stretching vibrations of CO and CC (unoxidized sp 2 bonds) were observed at 1733 and 1620 cm –1 , respectively.…”

Section: Resultsmentioning

confidence: 87%

“…The level of exfoliation corresponding to GO and bifunctionalized GO (AGOL, AGOM, and AGOH) was analyzed by X-ray diffraction (XRD), as shown in Figure b. In the case of GO, it is possible to observe the principal peak (2θ Bragg angle) in 11.1° (corresponding to an interplane distance of d 002 = 0.8 nm), which is in good agreement with the previous reports in the literature. , Further, when GO has been functionalized with 6 μmol/m 2 , a shift of the principal peak up to 6.8° was observed, which indicates an exfoliation of the functionalized layers, thus increasing their interplanar distance up to d 002 = 1.32 nm. Also, a broad pick of low intensity was observed at 22 ° ( d 002 = 0.4 nm) and was attributed to a restructuration of the basal plane during the functionalization process.…”

Section: Resultsmentioning

confidence: 99%

On the Effect of Ultralow Loading of Microwave-Assisted Bifunctionalized Graphene Oxide in Stereolithographic 3D-Printed Nanocomposites

Ramírez-Soria

Bonilla‐Cruz

Flores-Amaro

et al. 2020

ACS Appl. Mater. Interfaces

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Surface functionalization of graphene oxide (GO) is one of the best ways to achieve homogeneous dispersions of GO within polymeric matrices and composites. Nonetheless, studies regarding how the level of GO functionalization affects the macroscopic properties of three-dimensional (3D) printed nanocomposites are still few. Furthermore, the bifunctionalization of GO with the NH 2 /NH 3 + groups to obtain improved thermomechanical macroscopic properties at ultralow loads has not been reported. In this paper, fast and straightforward surface bifunctionalization of GO with a controlled ratio of NH 2 /NH 3 + groups at low, medium, and high functionalization levels (AGOL, AGOM, and AGOH) in a one-step microwave-assisted synthesis is reported for the first time. The functionalization mechanism was disclosed, wherein three graft densities (G φ ) were obtained. A plateau of maximum functionalization (G φ = 4.9 μmol/m 2 = 2.9 molecules/nm 2 ) was reached, suggesting that full coverage of the GO surface is achievable. Also, an increase in the exfoliation of functionalized layers was obtained, ranging from d 002 = 8.6 Å up to d 002 = 15.8 Å. X-ray photoelectron spectroscopy (XPS) reveals the successful functionalization of GO, as well as an atomic relationship NH 2 /NH 3 + of about 50/50% in all functionalized samples. Stereolithographic (SLA) 3D-printed nanocomposites (AGOL/R, AGOM/R, and AGOH/R) were obtained using ultralow loads (0.01 wt %) of each bifunctionalized material. This ultralow amount was sufficient to enhance thermal stability (up to 4 °C) and a significant increase in the glass transition temperature (93 °C ≤ T g ≤ 120 °C). Interestingly, we found that low and medium grafting density promotes a ductile material (ε > 5%); meanwhile, a high graft density produces brittle materials. Also, we observe that the toughness can be tuned as a function of the graft density (AGOH: 24 MPa, AGOM: 342 MPa, AGOL: 562 MPa) at ultralow loadings. The 3D-printed nanocomposites using GO with low graft density (AGOL) increase their tensile strain by 90% in comparison with the control sample (without filler). Finally, the underlying mechanisms were discussed to explain the findings.

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“…Moreover, the atmospheric humidity affects the mechanical property of the GO paper, increase in the relative humidity to 100%, the GO colloidal solution absorbs water from moisture and it bulges to 70% which decreases the tensile strength [34]. The functionalization on graphene surface also affects the mechanical properties depending on the functional moieties as well as the bonding nature [38][39][40]. The electrical properties of GO papers depend on the synthetic methods as several changes were observed in structures and reduction ratios of C/O.…”

Section: Free-standing Graphene: Synthesis and Its Propertiesmentioning

confidence: 99%

Progress on Free-Standing Graphene Hybrid: Advantages and Future Scenario

Ramalingam¹,

Chen²

2019

Energy Storage Devices

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Free-standing graphene (FSG) paper like electrodes has paid attention to the energy storage device application in the past decade. It befits to fabricate flexible devices due to its remarkable mechanical strength and offers high electrical conductivity. In this chapter, we explore the advantages and future prospects of FSG fresh candidate in rechargeable batteries. Herein, we summarized the synthetic strategies used for FSG fabrication and its properties, followed by its application in rechargeable batteries. Extensively, this chapter deals with fabrication of FSG hybrid composite papers for battery applications to understand the overall device performance. Specifically, we discuss the benefits of FSG electrodes over conventional electrode material and its fabrication in battery system. Ultimately, we conclude with the significance of FSG paper in battery application and forthcoming advantage for recycling purposes.

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Tuning the Mechanical, Electrical, and Optical Properties of Flexible and Free-Standing Functionalized Graphene Oxide Papers Having Different Interlayer d Spacing

Cited by 12 publications

References 55 publications

Super-Anticorrosive Materials Based on Bifunctionalized Reduced Graphene Oxide

Super-Anticorrosive Materials Based on Bifunctionalized Reduced Graphene Oxide

On the Effect of Ultralow Loading of Microwave-Assisted Bifunctionalized Graphene Oxide in Stereolithographic 3D-Printed Nanocomposites

Progress on Free-Standing Graphene Hybrid: Advantages and Future Scenario

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