Matter最新文献

Covalent organic framework (COF)-based Z-scheme heterostructures are great potential photocatalysts, while they are usually limited by the sluggish photo-induced dynamic behavior at the interface of the heterostructure. Herein, a COF-based Z-scheme heterostructure monolithic aerogel, consisting of hydroxy-functionalized COFs (OH−COF) and poly(terpyridine)metal complex (Re-CP), is designed. Benefiting from the perfect match between the size of terpyridine unit and the pore aperture of OH−COF, the CH···O interactions between OH−COF and Re-CP are achieved. Meanwhile, chemical bonds can be formed between Re ions of Re-CP and C=N groups of OH−COF. The construction of multiple interactions at the heterojunction interface can provide multiple charge transport pathways, increase the strength of the built-in electric field, and minimize the exciton binding energy, which achieves ultrafast charge transfer and generates more long-lived free charge carriers (up to 46.9 ns of the average life) for photoredox reactions. The heterostructural aerogel exhibits a high photocatalytic activity in gas-solid CO₂ reduction.

Microwave gas sensors (MGSs) have attracted the interest of researchers because of their low power consumption, non-contact operation, and room temperature detection capabilities. However, the practical use of sensitive circuits is currently inadequate. In this context, we propose a reconfigurable rectangular waveguide microwave gas sensor (RWMGS). This RWMGS is achieved by designing a high Q-factor waveguide sensitive circuit and employing an In₂O₃/Al₂O₃ monolith as the sensitive material. The prepared RWMGS exhibited an ultra-low detection limit of 10 ppb, high selectivity for NH₃, and a remarkable sensitivity of 116.1 dB ppm⁻¹ for concentrations lower than 50 ppb. Importantly, we introduce a chip-type sensor mode that can be used for complex system detection. This simplifies the sensing system and provides significant advantages in MGS design. These advantages can be attributed to the unique hierarchical porous structure of the monolith and the high Q-factor waveguide resonator.

Cells, as the fundamental units of life, possess unique and essential functionalities. To harness their full potential and modulate specific phenotypes for challenging diseases treatment, engineered cells have emerged as a promising clinical approach. A recent study published in Nature Biomedical Engineering demonstrates a strategy to engineer drug-free “cell backpacks” onto neutrophil surfaces using bioorthogonal techniques. This innovation enables sustained activation of neutrophils into an anticancer phenotype, facilitating systemic immune regulation for tumor suppression.

Brain-computer interface (BCI) technology enables innovative communication between the brain and machines, extending its impact beyond healthcare to various daily activities. Electrodes play a pivotal role in electroencephalogram (EEG)-based BCIs, serving as the crucial link between brain electrical activity and technology for signal acquisition and transmission. The conducting polymer poly(3,4-ethylenedioxythiophene):poly(styrenesulfonic acid) (PEDOT:PSS) has emerged as an optimal material for electrode modification due to its exceptional electron-ion conductivity and biocompatibility. However, ensuring high-quality and stable signal transmission in BCIs requires multifaceted efforts. This review comprehensively explores BCI construction techniques and applications, covering performance metrics, established electrode types, operational principles, and recent advancements in PEDOT:PSS-based electrodes. System design aspects, including connection methods, circuit design, and algorithms, are detailed, along with explanations of prevalent EEG-based BCI tests—P300, motor imagery, and steady-state visual evoked potential. The conclusion outlines specific BCI applications and briefly addresses the prospects and challenges of this emerging technology.