Structural engineering in multiple scales permits the integration of exotic properties into a single material, which boosts the development of ultracompact multifunctional devices. Layered perovskites are capable of cross-linking efficient carrier transport originating from few-layer perovskite frameworks with extended functionalities contributed by designable bulky organic cations and nanostructures, thus providing a platform for multiscale material engineering. Herein, high-performance Stokes-parameter photodetectors for arbitrary polarized light detection are realized on the basis of solution-processed chiral-perovskite nanowire arrays. The chiral ammonium cations intercalated between the perovskite layers are responsive to circularly polarized light with a maximum anisotropy factor of 0.15, while the strictly aligned nanowires with the anisotropic dielectric function result in a large polarized ratio of 1.6 to linearly polarized light. Single crystallinity and pure crystallographic orientation permit efficient in-plane carrier transport along the nanowires, yielding a responsivity of 47.1 A W –1 and a detectivity of 1.24 × 1013 Jones. By synergy of linear- and circular-polarization response with high optoelectronic performance for providing sufficient photocurrent contrasts, Stokes-parameter photodetection is demonstrated on these nanowires. Our Stokes-parameter photodetectors with a small footprint and high performances present promising applications toward polarization imaging.

Interfacial materials exhibiting superwettability have emerged as important tools for solving the real‐world issues, such as oil‐spill cleanup, fog harvesting, etc. The Janus superwettability of lotus leaf inspires the design of asymmetric interface materials using the superhydrophobic/superhydrophilic binary cooperative strategy. Here, the presented Janus copper sheet, composed of a superhydrophobic upper surface and a superhydrophilic lower surface, is able to be steadily fixed at the air/water interfaces, showing improved interfacial floatability. Compared with the floatable superhydrophobic substrate, the Janus sheet not only floats on but also attaches to the air–water interface. Similar results on Janus sheet are discovered at other multiphase interfaces such as hexane/water and water/CCl4 interfaces. In accordance with the improved stability and antirotation property, the microboat constructed by a Janus sheet shows the reliable navigating ability even under turbulent water flow. This contribution should unlock more functions of Janus interface materials, and extend the application scope of the binary cooperative materials system with superwettability.

between gas and the aqueous solution. [4] Thus, a number of research groups were devoted to designing specific surfaces with specific controllability of bubbles, e.g., superhydrophobic cone, [5] superaerophilic geometry-gradient channel, [6] lubricantinfused slippery surface, [7] elastic liquidinfused material, [8] Janus mesh, [9] etc. Previous studies, to some extent, have realized spontaneous and directional bubble transport underwater, including 1D bubble transport along channels with the assistance of wettability gradient derived from a Janus interconnected structure, [9,10] 2D transport depending on specific inclined planes with the aid of buoyancy or on specific asymmetric surfaces with geometric gradient, [11] demonstrating meaningful but limited bubble transport processes. Further integration of different controlling strategies can diversify the bubble controlling strategy, which should unlock more options for applying such interfaces in extensive fields. [12] For instance, Yong and co-workers demonstrated an effective self-driven gas separation system based on a monolithic photovoltaic-electrolysis device, of which the key idea is gas bubble manipulation by a slippery porous surface and buoyant force. [12b] Zhang et al. incorporated an asymmetric star-shaped slippery track with copper wire cathode, which realized continuous electrolysis and efficient collection of H 2 microbubbles in a pressured environment. [12c] The regulation of bubble transport in aqueous environments is more attractive to broaden the applications of underwater bubble manipulation yet much more challenging because of the increased complexity in dominating bubble transport direction.Water splitting is a promising strategy to produce hydrogen and oxygen synergistically, which is a typical gas-related underwater chemical reaction. [13] The regulation of bubble generation and collection should offer a great opportunity to develop advanced and integrated water-splitting devices toward practical energy production, whereas urgently to be addressed is how to acquire pure product gases. [14] Classical resolutions are introducing ion exchange membranes that prevent the potential gases mixing, but this membrane-based system has demerits in high cost and low durability of membrane modules. [15] Membrane-less electrolysis that gets rid of the membranes from the system and replaces with fluid manipulation to separate the product gases has recently emerged and exhibits superiority Clean energy generated from total water splitting is expected to be an affordable, sustainable, and reliable resource but it remains a challenge to gain pure fuel with a controllable pathway. Here, a simple and economical strategy that enables in situ separation of H 2 /O 2 product by manipulating the generated gas phases with the aid of multi-bioinspired electrodes is proposed. This versatile electrode is based on a Janus asymmetric foam with dual gradients, i.e., the wettability gradient promotes the one-way gas penetration and the geometry gradient boosts the sp...

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Superconductivity is mutually exclusive with ferromagnetism, because the ferromagnetic exchange field is often destructive to superconducting pairing correlation. Well-designed chemical and physical methods have been devoted to realize their coexistence only by structural integrity of inherent superconducting and ferromagnetic ingredients. However, such coexistence in freestanding structure with nonsuperconducting and nonferromagnetic components still remains a great challenge up to now. Here, we demonstrate a molecule-confined engineering in two-dimensional organic-inorganic superlattice using a chemical building-block approach, successfully realizing first freestanding coexistence of superconductivity and ferromagnetism originated from electronic interactions of nonsuperconducting and nonferromagnetic building blocks. We unravel totally different electronic behavior of molecules depending on spatial confinement: flatly lying Co(Cp) molecules in strongly confined SnSe interlayers weaken the coordination field, leading to spin transition to form ferromagnetism; meanwhile, electron transfer from cyclopentadienyls to the Se-Sn-Se lattice induces superconducting state. This entirely new class of coexisting superconductivity and ferromagnetism generates a unique correlated state of Kondo effect between the molecular ferromagnetic layers and inorganic superconducting layers. We anticipate that confined molecular chemistry provides a newly powerful tool to trigger exotic chemical and physical properties in two-dimensional matrixes.

Fabricating ultrathin organic semiconductor nanostructures attracts wide attention towards integrated electronic and optoelectronic applications. However, the fabrication of ultrathin organic nanostructures with precise alignment, tunable morphology and high crystallinity for device integration remains challenging. Herein, an assembly technique for fabricating ultrathin organic single-crystal arrays with different sizes and shapes is achieved by confining the crystallization process in a sub-hundred nanometer space. The confined crystallization is realized by controlling the deformation of the elastic topographical templates with tunable applied pressures, which produces organic nanostructures with ordered crystallographic orientation and controllable thickness from less than 10 nm to ca . 1 μm. The generality is verified for patterning various typical solution-processable materials with long-range order and pure orientation, including organic small molecules, polymers, metal-halide perovskites and nanoparticles. It is anticipated that this technique with controlling the crystallization kinetics by the governable confined space could facilitate the electronic integration of organic semiconductors.

Fabrication of high‐quality organic single‐crystalline semiconductors and their deterministic patterning are core opportunities as well as challenges for large‐scale integration of functional devices with high efficiency and boosted performance. Previous approaches on solution patterning of organic semiconductors have achieved efficient and versatile control of the position, alignment, and size of organic structures. However, the poorly controllable dewetting dynamics of organic solution gives rise to low crystallinity and disordered crystallographic orientation of generated organic architectures that limit their device performance. Here, 1D organic single‐crystal arrays with high crystallinity, strict crystallographic alignment, precise position, tunable, and homogeneous size are fabricated by exploiting an asymmetric‐wettability topographical template. Periodically arranged micropillars with lyophobic sidewalls and lyophilic tops permit the generation of capillary bridges, which enable unidirectional dewetting of organic solution and ordered packing of molecules. The 1D arrays present pure (100) crystallographic orientation with π–π stacking of molecules in the optimal direction of carrier transport, leading to high carrier mobility of 8.7 cm2 V−1 s−1 in the field‐effect transistor measurements. A facile pressure sensor based on the patterned belt arrays is fabricated, exhibiting high sensitivity and long‐term stability.

A facile surface modification strategy on metallic Ni2P nanosheets electrocatalyst greatly enhances water oxidation activity.