Nanjing University of Science and Technology

About: Nanjing University of Science and Technology is a education organization based out in Nanjing, China. It is known for research contribution in the topics: Catalysis & Computer science. The organization has 31581 authors who have published 36390 publications receiving 525474 citations. The organization is also known as: Nánjīng Lǐgōng Dàxué & Nánlǐgōng.

6G Internet of Things: A Comprehensive Survey

Abstract: The sixth generation (6G) wireless communication networks are envisioned to revolutionize customer services and applications via the Internet of Things (IoT) towards a future of fully intelligent and autonomous systems. In this article, we explore the emerging opportunities brought by 6G technologies in IoT networks and applications, by conducting a holistic survey on the convergence of 6G and IoT. We first shed light on some of the most fundamental 6G technologies that are expected to empower future IoT networks, including edge intelligence, reconfigurable intelligent surfaces, space-air-ground-underwater communications, Terahertz communications, massive ultra-reliable and low-latency communications, and blockchain. Particularly, compared to the other related survey papers, we provide an in-depth discussion of the roles of 6G in a wide range of prospective IoT applications via five key domains, namely Healthcare Internet of Things, Vehicular Internet of Things and Autonomous Driving, Unmanned Aerial Vehicles, Satellite Internet of Things, and Industrial Internet of Things. Finally, we highlight interesting research challenges and point out potential directions to spur further research in this promising area.

2D V-V Binary Materials: Status and Challenges.

Abstract: 2D phosphorene, arsenene, antimonene, and bismuthene, as a fast-growing family of 2D monoelemental materials, have attracted enormous interest in the scientific community owing to their intriguing structures and extraordinary electronic properties. Tuning the monoelemental crystals into bielemental ones between group-VA elements is able to preserve their advantages of unique structures, modulate their properties, and further expand their multifunctional applications. Herein, a review of the historical work is provided for both theoretical predictions and experimental advances of 2D V-V binary materials. Their various intriguing electronic properties are discussed, including band structure, carrier mobility, Rashba effect, and topological state. An emphasis is also given to their progress in fabricated approaches and potential applications. Finally, a detailed presentation on the opportunities and challenges in the future development of 2D V-V binary materials is given.

Graphene quantum dots as a fluorescent sensing platform for highly efficient detection of copper(II) ions

Abstract: Graphene quantum dots (GQDs) have been attractive due to their optical properties with the change of the size. The stable blue fluorescent GQDs are prepared via the hydrothermal method using reoxidized graphene oxide. Based on the quenching of as-prepared GQDs fluorescence by Cu(II) in water, a facile and direct fluorescence sensor for the detection of Cu2+ ions has been studied. It exhibits an extraordinarily high sensitivity and selectivity to Cu2+ ions compared to other metal ions in aqueous solution. The fluorescence intensity is inversely proportional to the concentration of Cu2+ ions, and the calibration curve displays linear regions over the range of 0-15 μM, with a detection limit of 0.226 μM. These results indicate that GQDs, as a fluorescent sensing platform, could meet the selective requirements for biomedical and environmental application and be sensitive enough to detect Cu2+ ions in environmental water samples, even in drinking water, which has a limit of 20 μM defined by the U.S. Environmental Protection Agency. The possible mechanism of Cu(II)-induced fluorescence quenching of GQDs was also discussed. The fluorescence lifetime experimental result demonstrates that the quenching mechanism appears to be predominantly of the static (rather than dynamic) type.