Carbon dots (CDots)‐based solid‐state luminescent materials have important applications in light‐emitting devices owing to their outstanding optical properties. However, it still remains a challenge to develop multiple‐color‐emissive solid‐state CDots, due to the serious self‐quenching of the CDots in the aggregation or solid state. Herein, a one‐step synthesis of multiple‐color‐emissive solid‐state silica‐coated CDots (silica/CDots) composites by controlling CDots loading fraction and composite morphology to realize the adjustment of emitting color is reported. The emission of resultant silica/CDots composites shifts from blue to orange with the photoluminescence quantum yields of 57.9%, 34.3%, and 32.7% for blue, yellow, and orange emitting, respectively. Furthermore, the yellow emitting silica/CDots composites exhibit an excellent fluorescence thermal stability, and further have been applied to fabricate white‐light‐emitting devices with a high color rendering index of above 80.
Polydopamine is a synthetic analogue of natural melanin (eumelanin) produced from oxidative polymerization of dopamine. Owing to its strong adhesion ability, versatile chemical reactivity, biocompatibility and biodegradation, polydopamine is commonly applied as a versatile linker to synthesize colloidal materials with diverse structures, unique physicochemical properties and tunable functions, which allow for a broad scope of applications including biomedicine, sensing, catalysis, environment and energy. In this personal account, we discuss first about the different synthetic approaches of polydopamine, as well as its polymerization mechanism, and then with a comprehensive overview of recent progress in the synthesis and applications of polydopamine-based colloidal materials. Finally, we summarize this personal account with future perspectives.
By adopting polydopamine chemistry, a single‐step approach is introduced toward hierarchical surfaces with tunable surface wetting properties via adjusting the reaction temperature. After the hydrophobic surface decoration, the tunable superhydrophobicity of the surfaces is achieved. This tunability has been realized on a series of materials with different surface geometries, including silica nanospheres and microrods, silicon wafer, stainless steel mesh, and melamine‐formaldehyde sponge. These superhydrophobic mesh and sponge are ideal candidates for collecting various oils/organic solvents from water, because not only they exhibit high absorption/separation capacity, excellent selectivity, and extraordinary recyclability, but also they are highly chemically resistant, environmentally stable and mechanically durable. This whole procedure is straightforward, cost‐effective, green, and material‐ and surface geometry‐independent, more importantly, the obtained surface morphology is tunable, providing more opportunities to cater the demands from fundamental and practical fields.
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