Article
Engineering, Electrical & Electronic
Yun Lei, Yongqin Wang, Peng Du, Yuncui Wu, Can Li, Beibei Du, Linhui Luo, Zhengguang Sun, Bingsuo Zou
Summary: Nitrogen-doped graphene quantum dots modified SnO2 composites were synthesized using a solvothermal method. The addition of N-GQDs significantly improved the photoelectric properties of the composites, increasing the photocurrent density and generating more carriers under UV illumination.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Polymer Science
Tatiana P. Dyachkova, Yulian A. Khan, Elena A. Burakova, Evgeny V. Galunin, Gulnara N. Shigabaeva, Dmitry N. Stolbov, Georgy A. Titov, Nikolay A. Chapaksov, Alexey G. Tkachev
Summary: This paper discusses the development of fillers made from mixtures of carbon nanotubes and graphene materials to modify epoxy resin. The effects of different types and contents of graphene on the particle sizes of the dispersed phase in aqueous suspensions and the resin were analyzed. The optimal dispersions were achieved at a mass ratio of 1:4 between carbon nanotubes and graphene oxide, with particle sizes of 75-100 nm. The composites showed increased tensile strength and modulus when containing 0.15-0.20 wt.% of carbon nanotubes/graphene oxide at a ratio of 1:1.
Article
Chemistry, Physical
Guangjing Hou, Yatao Pan, Lulu Qiao, Xia Ran, Tianfeng Li, Zhen Chi, Pingan Liu, Yulu He, Yanmin Kuang, Lijun Guo
Summary: This study demonstrates the enhanced photoelectric properties of Au nanoclusters (Au NCs) and graphene quantum dots (GQDs) composites. The Au NCs act as electron donors to sensitize the GQDs, resulting in improved light absorption and photoelectric performance. The efficient electron transfer from Au NCs to GQDs quenches the fluorescence of Au NCs and enhances the charge separation. The type-II band alignment of Au NCs and GQDs promotes the electron transfer and enhances the photoelectric current.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Composites
Fabrizia Cilento, Alfonso Martone, Maria Giovanna Pastore Carbone, Costas Galiotis, Michele Giordano
Summary: Nanocomposites based on biomimetic brick and mortar architecture have attracted great attention due to their excellent mechanical and functional properties, with a key feature being a regular nanostructure consisting of alternating nanoplatelets and matrix layers. The bottom-up manufacturing processes, which control the alternation of the two phases at the nanoscale, are different from top-down manufacturing processes and show better potential for developing and improving this new class of engineering materials.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Multidisciplinary Sciences
Zahra Ebrahim Nataj, Youming Xu, Dylan Wright, Jonas O. Brown, Jivtesh Garg, Xi Chen, Fariborz Kargar, Alexander A. Balandin
Summary: In this study, the authors investigate the thermal conductivity of graphene composites at different temperatures. They find that the thermal conductivity can be both higher and lower than that of pure epoxy, depending on the graphene filler loading and temperature. They explain this counter-intuitive trend by the increasing effect of thermal boundary resistance at cryogenic temperatures and the anomalous thermal percolation threshold.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Chandrasekar Perumal Veeramalai, Pratap Kollu, Guochen Lin, Xiaoming Zhang, Chuanbo Li
Summary: The integration of graphene with semiconducting quantum dots (QDs) in high-performance optoelectronic devices is demonstrated in this article. The device based on graphene: CdSe QDs/CdS nanorod heterostructures shows excellent operating characteristics, including a maximum photoresponsivity and specific detectivity under 530 nm light illumination. The study also investigates the enhancement of performance in the heterojunction photodetector with graphene nanosheets, showing that enhanced energy transfer and exciton generation contribute to increased light absorption and photocurrent density.
Article
Construction & Building Technology
Xiangqing Kong, Rongzheng Wang, Tingting Zhang, Ruoxi Sun, Ying Fu
Summary: This study investigates the effect of reduced graphene oxides (rGO) with different oxygen concentrations on the durability and microstructure of cement-mortar composites. The results show that rGO with mild oxygen group level can significantly enhance the durability of the composites by reducing water absorption and promoting cement hydration reaction. The presence of mild oxygen acid groups on the surface of rGO acts as a neutralizer and improves the compactness of the matrix by forming calcium carbonate precipitation.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Luca Lavagna, Daniele Massella, Emanuele Priola, Matteo Pavese
Summary: The oxygen content of graphene-based materials significantly affects the performance of cement composites, with reinforcements containing higher oxygen content tending to aggregate, while functionalized graphene with 5% oxygen ensures proper dispersion and interaction with the cement.
CEMENT & CONCRETE COMPOSITES
(2021)
Article
Materials Science, Ceramics
Yun Lei, Beibei Du, Peng Du, Yuncui Wu, Yongqin Wang, Can Li, Linhui Luo, Bingsuo Zou
Summary: CdSxSe1-x/N-GQDs composites with tunable composition were synthesized via a simple hydrothermal process, and their photoelectric properties were investigated. The composites exhibited optimal photocurrent response and lowest interfacial impedance at a specific Se/S ratio. The excellent performance of the composites can be attributed to the mechanism involved in the excitation and electron-transfer process.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Composites
Guangyuan Lin, Yifei Peng, Zhilei Dong, Ding-Bang Xiong
Summary: In this study, high-content graphene-reinforced nanograined Cu matrix composites were prepared by hot-pressing. The results showed a significant reduction in coefficient of friction and specific wear rate. The microstructural evolution of the composites during friction process played a key role in influencing their tribology properties.
COMPOSITES COMMUNICATIONS
(2021)
Article
Polymer Science
Borys M. Gorelov, Oleksandr Mischanchuk, Nadia Sigareva, Sergey Shulga, Alla M. Gorb, Oleksiy Polovina, Volodymyr O. Yukhymchuk
Summary: Multilayered graphene nanoplatelets (MLGs) were prepared using an electrochemical technique from thermally expanded graphite flakes. The morphological characterization and studies on DGEBA-epoxy-based nanocomposites filled with MLGs showed enhancements in compression strength, Young's modulus, thermal stability, and dielectric properties at varying loadings. Discussions on the physical mechanisms of MLG-epoxy interactions underlying the observed effects were also included in the study.
Article
Green & Sustainable Science & Technology
Shudan Li, Man Li, Mingjian Xu, Xueying Li, Kun Gao
Summary: In this study, C spheres were synthesized via a hydrothermal method and used as a C source to obtain C-LaFeO3 composites with different C contents (5%, 10%, 15%, and 20%). The effects of C content on the structure, morphology, and photoelectric properties of LaFeO3 were investigated experimentally. The results showed that proper C doping improved the photocatalytic and electrochemical activities of the composites, while excessive C reduced their activities. Among the different C contents, the 15% C-LaFeO3 composite exhibited the best photocatalytic performance, with a degradation efficiency of 97% for methylene blue solution under visible light. Moreover, C doping significantly enhanced the redox reaction capacity and specific capacitance of the composites, with the 15% C-LaFeO3 composite having a specific capacitance about 2.5 times that of LaFeO3.
Article
Engineering, Electrical & Electronic
Jun Su, Caihong Li
Summary: The study shows that adding graphene platelets can significantly increase the dielectric constant and decrease the complex viscosity of EPDM-based elastomers, with 0.5% graphene increasing the relative ratio of dielectric constant to Young's modulus by 180%.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Fang Yang, Hao Huang, Wei Dong
Summary: Graphene plays a crucial role in the field of energy conversion, and the study of its by-products is becoming increasingly urgent. In this study, NiS/GR composite was successfully synthesized using graphene residual carbon, with the best electrochemical performance observed at 5% graphene residual carbon content.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Cheng-Fang Liu, He Lin, Shuang-Shuang Li, Hui Xie, Jia-Ling Zhang, Dong-Zhou Ji, Yu Yan, Xu Liu, Wen-Yong Lai
Summary: This study creates a smart responsive integrated photoelectric organic modulator, which can efficiently and reversibly tune light emission by combining conjugated polymers and photochromic molecules, leading to intelligent integration of optoelectronic characteristics.
ADVANCED FUNCTIONAL MATERIALS
(2022)
