Cooperative Multiagent Attentional Communication for Large-Scale Task Space

Acknowledgments This work was supported by the Dalian University Research Platform Project Funding: Dalian Wise Information Technology of Med and Health Key Laboratory, the National Natural Science Foundation of China: Research on the stability of multi-surface high-speed unmanned boat formation and the method of cooperative collision avoidance in complex sea conditions, NO.61673084.Peer reviewedPostprintPublisher PD

Silver-Assisted Thiolate Ligand Exchange Induced Photoluminescent Boost of Gold Nanoclusters for Selective Imaging of Intracellular Glutathione

Metal/ligand exchange is a common strategy for precise assembly of metal nanoclusters (NCs) in organic phases. However, such a case is still not well studied in the aqueous phase. In this work we have demonstrated the silver ions assisted ligand exchange on water-soluble <i>N</i>-acetylcysteine (NAC) stabilized Au NCs. Silver ions may trigger both silver–gold metal exchange and silver addition on Au NCs. Unlike those well-reported silver induced photoluminescent (PL) enhancements, the processes show little changes in PL intensity. The as-obtained AuNAC@Ag NC can further promote the ligand exchange between NAC and glutathione (GSH) and induce a maximum of a 20-fold increase in PL emission at 570 nm. The enhancement was proportional to the concentration of GSH, with a linear range of 0–0.5 mM. For other thiol compounds such as cysteine, NAC, and cysteamine, no significant PL changes were observed. Cytotoxicity evaluation shows that the AuNAC@Ag NCs are biocompatible. Thus, the intracellular GSH can be specially visualized by the formation of stable AuNAC@AgGSH NCs. These results may be helpful to reveal the underlying processes of metal/ligand exchange on NCs in aqueous environment and pave a new avenue for facile design and preparation of efficient imaging probe candidates

Graphene/Graphitized Polydopamine/Carbon Nanotube All-Carbon Ternary Composite Films with Improved Mechanical Properties and Through-Plane Thermal Conductivity

Graphene films (GFs) are promising ultrathin thermally conductive materials for portable electronic devices because of their excellent thermally conductive property, light weight, high flexibility, and low cost. However, the application of GFs is limited due to their poor mechanical properties and through-plane thermal conductivity. Here, a graphene-(graphitized polydopamine)-(carbon nanotube) (G-gPDA-CNT) all-carbon ternary composite film was fabricated by chemical reduction, carbonization, graphitization, and mechanical compaction of the evaporation-assembled (graphene oxide)-PDA@CNT film. The G-gPDA-CNT film exhibited a uniform all-carbon composite structure in which the components of the graphene, gPDA layers, and CNTs were cross-linked by strong covalent bonds. This unique structure promoted the load transfer and energy dissipation between the components by which the mechanical properties of the G-gPDA-CNT film were substantially improved. Furthermore, electron and phonon transfers were also promoted, greatly improving the electrical and thermal conductivities, especially the through-plane thermal conductivity of the G-gPDA-CNT film. The G-gPDA-CNT film showed a tensile strength of 67.5 MPa, 15.1% ultimate tensile strain, toughness of 6.07 MJ/m3, electrical conductivity of 6.7 × 105 S·m-1, in-plane thermal conductivity of 1597 W·m-1·K-1, and through-plane thermal conductivity of 2.65 W·m-1·K-1, which were 2.24, 1.44, 3.16, 1.46, 1.15, and 3.90 times that of the pure GFs, respectively.</p