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...