In this work, we report the first hybrid nanosized photoinitiators with low cytotoxicity and migration by coupling of polyhedral oligomeric silsesquioxanes (POSS) to benzophenone derivatives. This new series of photoinitiators were fully characterized and showed many favorable properties such as uniform sizes, extremely low tendency to migrate, less effect on resin viscosity, enhanced thermal stability and mechanical strength, increased photoactivity, and significantly lower cell toxicity compared to their corresponding benzophenone molecules. The utility of these hybrid nanosized photoinitiators in 3D printing was demonstrated in printing of various 3D structures with high resolution and accuracy.

Sphere‐like Fe3O4 aggregates were solvothermally prepared with ethylene glycol, sodium acetate and FeCl3·6H2O as raw materials. The sphere‐like Fe3O4 aggregates provided heterogeneous growth sites for Au nanoparticles. These were obtained by reduction of HAuCl4 by sodium citrate under mild reaction conditions and the Fe3O4‐Au nanocomposites were subsequently formed. The peroxidase‐like activity of nanocomposites was studied with H2O2 and 3,3′,5,5′‐tetramethylbenzidine as substrates. Fe3O4‐Au nanocomposites exhibited better catalytic activity than pure Fe3O4 aggregates, mainly resulting from the special electronic structure at the interfaces between the sphere‐like Fe3O4 aggregates and the gold nanoparticles.

Poly(vinyl alcohol) (PVA) networks cross‐linked by inorganic nanofillers‐boehmite (AlOOH) nanowires via strong hydrogen bonding was prepared by a facile strategy. These PVA‐AlOOH composites displayed significantly enhanced mechanical and thermal properties due to the excellent mechanical property and high heat resistant of AlOOH nanowires, as well as the strong hydrogen bonding formed between PVA and AlOOH. Interestingly, it was worth mentioning that the PVA‐AlOOH composites exhibited excellent shape memory behavior. The strong hydrogen bonding between PVA matrix and AlOOH nanowires acted as the hard segments to maintain the permanent shape, while the weak one between PVA chains served as switching segments to fix the temporary shape and recover to the permanent shape. This physical cross‐linked system provided a simple and efficient strategy to obtain smart shape memory materials.

Rational design and construction of interface heterostructures, which can simultaneously accelerate the photoinduced carrier separation and enhance the surface water oxidation kinetics, is of great necessity for photoelectrochemical (PEC) water oxidation. Herein, we report a new strategy for boosting the PEC water oxidation by introducing Schottky junction and semiconductor/water oxidation cocatalysts (SC/WOCs) junction into the TaON photocatalyst. Compared with pristine TaON photoanode, the hierarchical TaON/Au/ZnCo-LDH (LDH = layered double hydroxide) photoanode reveals a cathodic shift of 156 mV for the onset potential and 17.3-fold photocurrent density enhancement at 1.23 V vs RHE, as well as improved long-term stability. Diagnostic efficiencies of the TaON/ Au/ZnCo-LDH photoanode demonstrate that the enhanced PEC performance is not dominated by surface electrochemical water oxidation kinetics but largely contributed by the improved charge separation and transfer, indicative of synergistic effects of Au and ZnCo-LDH. Theoretical calculations further reveal that the midgap states introduced by Au and ZnCo-LDH in TaON electronic structures bring about photoexcited electrons concentrated on TaON, while holes accumulated on ZnCo-LDH to achieve efficiently spatial charge separation, which is responsible for the boosted PEC water oxidation performance. The present work highlights the importance and elucidates the mechanism of interface heterojunction in PEC water oxidation, which can provide an efficient approach to design and fabricate a new structural photoanode.

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