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1. Design of highly porous Fe ₃ O ₄ @reduced graphene oxide via a facile PMAA-induced assembly

   https://doi.org/10.1039/c9ra04980k  

   Wang, Huan; Kalubowilage, Madumali; Bossmann, Stefan H.; Amama, Placidus B. (September 2019, RSC Advances)

   Advances in the synthesis and processing of graphene-based materials have presented the opportunity to design novel lithium-ion battery (LIB) anode materials that can meet the power requirements of next-generation power devices. In this work, a poly(methacrylic acid) (PMAA)-induced self-assembly process was used to design super-mesoporous Fe 3 O 4 and reduced-graphene-oxide (Fe 3 O 4 @RGO) anode materials. We demonstrate the relationship between the media pH and Fe 3 O 4 @RGO nanostructure, in terms of dispersion state of PMAA-stabilized Fe 3 O 4 @GO sheets at different surrounding pH values, and porosity of the resulted Fe 3 O 4 @RGO anode. The anode shows a high surface area of 338.8 m 2 g −1 with a large amount of 10–40 nm mesopores, which facilitates the kinetics of Li-ions and electrons, and improves electrode durability. As a result, Fe 3 O 4 @RGO delivers high specific-charge capacities of 740 mA h g −1 to 200 mA h g −1 at various current densities of 0.5 A g −1 to 10 A g −1 , and an excellent capacity-retention capability even after long-term charge–discharge cycles. The PMAA-induced assembly method addresses the issue of poor dispersion of Fe 3 O 4 -coated graphene materials—which is a major impediment in the synthesis process—and provides a facile synthetic pathway for depositing Fe 3 O 4 and other metal oxide nanoparticles on highly porous RGO. 

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2. FeS ₂ Nanoparticles Embedded in Reduced Graphene Oxide toward Robust, High-Performance Electrocatalysts

   https://doi.org/10.1002/aenm.201700482  

   Chen, Yanan; Xu, Shaomao; Li, Yuanchang; Jacob, Rohit Jiji; Kuang, Yudi; Liu, Boyang; Wang, Yilin; Pastel, Glenn; Salamanca-Riba, Lourdes G.; Zachariah, Michael R.; et al (October 2017, Advanced Energy Materials)
3. Zinc oxide: reduced graphene oxide nanocomposite film for heterogeneous photocatalysis

   https://doi.org/10.1007/s11082-019-2132-1  

   Toporovska, L.; Turko, B.; Savchak, M.; Seyedi, M.; Luzinov, I.; Kostruba, A.; Kapustianyk, V.; Vaskiv, A. (January 2020, Optical and Quantum Electronics)
4. One-Pot Synthesis of Reduced Graphene Oxide/Metal (Oxide) Composites

   https://doi.org/10.1021/acsami.7b12539  

   Wu, Xu; Xing, Yuqian; Pierce, David; Zhao, Julia Xiaojun (October 2017, ACS Applied Materials & Interfaces)
5. Mechanical Characterization of Reduced Graphene Oxide Using AFM

   https://doi.org/10.1155/2019/8713965  

   Teklu, Alem; Barry, Canyon; Palumbo, Matthew; Weiwadel, Collin; Kuthirummal, Narayanan; Flagg, Jason (January 2019, Advances in Condensed Matter Physics)

   Nanoindentation coupled with Atomic Force Microscopy was used to study stiffness, hardness, and the reduced Young’s modulus of reduced graphene oxide. Oxygen reduction on the graphene oxide sample was performed via LightScribe DVD burner reduction, a cost-effective approach with potential for large scale graphene production. The reduction of oxygen in the graphene oxide sample was estimated to about 10 percent using FTIR spectroscopic analysis. Images of the various samples were captured after each reduction cycle using Atomic Force Microscopy. Elastic and spectroscopic analyses were performed on the samples after each oxygen reduction cycle in the LightScribe, thus allowing for a comparison of stiffness, hardness, and the reduced Young’s modulus based on the number of reduction cycles. The highest values obtained were after the fifth and final reduction cycle, yielding a stiffness of 22.4 N/m, a hardness of 0.55 GPa, and a reduced Young’s modulus of 1.62 GPa as compared to a stiffness of 22.8 N/m, a hardness of 0.58 GPa, and a reduced Young’s modulus of 1.84 GPa for a commercially purchased graphene film made by CVD. This data was then compared to the expected values of pristine single layer graphene. Furthermore, two RC circuits were built, one using a parallel plate capacitors made of light scribed graphene on a kapton substrate (LSGC) and a second one using a CVD deposited graphene on aluminum (CVDGC). Their RC time constants and surface charge densities were compared. 

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