Single-molecule spintronics is an emerging interdisciplinary field that integrates molecular electronics with spin-based information science, offering novel pathways for encoding, manipulating, and detecting spin at the molecular level. This review explores the fundamental principles, advances, and prospects of single-molecule spin devices, emphasizing the manipulation of spin states in various molecular systems, such as single-molecule magnets, spin crossover complexes, organic radicals, and chiral molecules. Due to their intrinsic quantum characteristics and tunable functionalities, these systems serve as ideal platforms for investigating spin-related phenomena including Kondo effects, spin filtering, and thermoelectric effects. The integration of molecular junctions with advanced measurement techniques, such as spin-polarized scanning tunneling microscopy and electron spin resonance, has significantly advanced the understanding of spin transport and coherence in single-molecule configurations. Furthermore, potential applications of these molecules in devices like spin valves, spin switches, and quantum bits are discussed, highlighting their promise for realizing low-power and high-efficiency spintronic technologies. Despite significant progress, several challenges remain in terms of stability, reproducibility, and scalability, necessitating further research into molecular design, interfacial engineering, and quantum coherence to enable practical applications in molecular spintronics and quantum information science.

Graphene with atomically smooth and configuration-specific edges plays the key role in the performance of graphene-based electronic devices. Remote hydrogen plasma etching of graphene has been proven to be an effective way to create smooth edges with a specific zigzag configuration. However, the etching process is still poorly understood. In this study, with the aid of a custom-made plasma-enhanced hydrogen etching (PEHE) system, a detailed graphene etching process by remote hydrogen plasma is presented. Specifically, we find that hydrogen plasma etching of graphene shows strong thickness and temperature dependence. The etching process of single-layer graphene is isotropic. This is opposite to the anisotropic etching effect observed for bilayer and thicker graphene with an obvious dependence on temperature. On the basis of these observations, a geometrical model was built to illustrate the configuration evolution of graphene edges during etching, which reveals the origin of the anisotropic etching effect. By further utilizing this model, armchair graphene edges were also prepared in a controlled manner for the first time. These investigations offer a better understanding of the etching process for graphene, which should facilitate the fabrication of graphene-based electronic devices with controlled edges and the exploration of more interesting properties of graphene.

Metal oxide hollow structures with multilevel interiors are of great interest for potential applications such as catalysis, chemical sensing, drug delivery, and energy storage. However, the controlled synthesis of multilevel nanotubes remains a great challenge. Here we develop a facile interface-modulated approach toward the synthesis of complex metal oxide multilevel nanotubes with tunable interior structures through electrospinning followed by controlled heat treatment. This versatile strategy can be effectively applied to fabricate wire-in-tube and tube-in-tube nanotubes of various metal oxides. These multilevel nanotubes possess a large specific surface area, fast mass transport, good strain accommodation, and high packing density, which are advantageous for lithium-ion batteries (LIBs) and the oxygen reduction reaction (ORR). Specifically, shrinkable CoMn₂O₄ tube-in-tube nanotubes as a lithium-ion battery anode deliver a high discharge capacity of ~565 mAh·g^-1 at a high rate of 2 A·g^-1, maintaining 89% of the latter after 500 cycles. Further, as an oxygen reduction reaction catalyst, these nanotubes also exhibit excellent stability with about 92% current retention after 30, 000 s, which is higher than that of commercial Pt/C (81%). Therefore, this feasible method may push the rapid development of one-dimensional (1D) nanomaterials. These multifunctional nanotubes have great potential in many frontier fields.