Shuanglong Yuan

Electronic copper paste, as a key material for fabricating electronic components, exhibits performance that is governed by the synergistic interaction between copper powder morphology and the thermal behavior of the glass phase. This study systematically investigated the sintering behavior of three copper powder morphologies (e.g. spherical, coral-like, and flake) paired with two types of glass powders-barium-zinc-boron glass (MCA1) and high-zinc-boron glass (MCB1)-and their mixture (A1B1). By analyzing the microstructure and conductive properties of the sintered bodies, combined with the thermal characteristics of the glass phases, the matching mechanism between the materials was elucidated. The results indicate that spherical copper powder requires matching with low-viscosity, high-fluidity MCB1 glass to establish a highly connected continuous conductive network. Coral-like copper powder needs to be paired with A1B1 glass, which combines low-temperature fluidity and controlled expansion, to infiltrate and fill its complex pores. Flake copper powder, however, should be matched with high-viscosity, high-hemispherical-point MCA1 glass to obtain structural support and maintain the stability of its two-dimensional conductive network. This study establishes a matching model linking copper powder morphology–sintering requirement with glass thermal behavior-functional response, providing a theoretical basis for the rational design of high-performance electronic copper pastes.

A seed-mediated growth method was used to synthesize copper nanoplates (Cu NPs) under mild conditions. By selecting pre-synthesized silver nanoplates as seeds, the synthesis efficiency and size controllability of Cu NPs have been greatly improved.

Perovskite‐based photodetectors (PDs) are broadly utilized in optical communication, non‐destructive testing, and smart wearable devices due to their ability to convert light into electrical signals. However, toxicity and instability hold back their mass production and commercialization. The lead‐free Cs₂AgBiBr₆ double perovskite film, promised to be an alternative, is fabricated by electrophoretic deposition (EPD), which compromises film quality. Herein, we improved the quality of the Cs₂AgBiBr₆ films and the performance of PDs by adding N‐acetylethylenediamine (DEAC) to Cs₂AgBiBr₆ perovskite precursor for EPD, in which the ligand DEAC provides a pair of lone electrons to Bi³⁺, forming coordinate covalent bonds. The optimized PDs have high detectivity, up to 4.4×10¹² Jones, and high stability in the air. The high‐performance, flexible Cs₂AgBiBr₆ perovskite PDs were fabricated on this basis, it also achieved the detectivity up to 3.2×10¹² Jones with excellent bending cycle stability. These results propose a feasible approach to improving the crystallization of double perovskite thin films by introducing ligands during the EPD process. Furthermore, they demonstrate enhanced optoelectronic performance, indicating that this method is also applicable to halide perovskites, offering an effective strategy to improve their film quality.

Artificial sensory afferent nerves that emulate receptor nanochannel perception and synaptic ionic information processing in chemical environments are highly desirable for bioelectronics. However, challenges persist in achieving life-like nanoscale conformal contact, agile multimodal sensing response, and synaptic feedback with ions. Here, a precisely tuned phase transition poly(N-isopropylacrylamide) (PNIPAM) hydrogel is introduced through the water molecule reservoir strategy. The resulting hydrogel with strongly cross-linked networks exhibits excellent mechanical performance (∼2000% elongation) and robust adhesive strength. Importantly, the hydrogel's enhanced ionic conductance and heterogeneous structure of the temperature-sensitive component enable highly sensitive strain information perception (GF_max = 7.94, response time ∼ 87 ms), temperature information perception (TCR_max = -1.974%/°C, response time ∼ 270 ms), and low energy consumption synaptic plasticity (42.2 fJ/spike). As a demonstration, a neuromorphic sensing-synaptic system is constructed integrating iontronic strain/temperature sensors with fiber synapses for real-time information sensing, discrimination, and feedback. This work holds enormous potential in bioinspired robotics and bioelectronics.

CsPbBr ₃ perovskite nanocrystals have potential applications in fingerprint identification due to their excellent optical properties. Unfortunately, the current synthesis methods need harsh conditions as well as large quantities of expensive and toxic organic solvents. Attention has been considerably attracted for the preparation of all inorganic perovskite nanocrystals with ethanol and water as solvents. However, due to the strong polarity of ethanol, the ligands have been dissolved and thus the perovskite nanocrystals have been destroyed. Here, we employed a remarkably simple strategy, using the adsorption of Br ⁻ by N ⁺ and the formation of the spatial network structure of polyvinyl pyrrolidone (PVP) and the polish of perovskite surface defects by trace water, successfully prepared CsPbBr ₃ nanocrystals in ethanol. The effects of PVP molecular weight and its concentration and the amount of water on the luminescence properties have been studied by XRD, FTIR, ultraviolet‐visible absorption and photoluminescence spectra. The prepared CsPbBr ₃ nanocrystals sol maintained 70 % of the initial photoluminescence intensity after 110 days of storage. By adding alcohol‐soluble thermoplastic acrylic resin, the fingerprint identification films have been prepared simply and quickly, and the three‐level structure of fingerprint can be clearly emerged. This strategy offered a great application prospect in the field of fast and high‐resolution fingerprint identification.

Cesium lead halide perovskite nanocrystals (CLHP NCs) have drawn considerable attention because of their promising optoelectrical properties. However, owing to the extreme vulnerability of CLHP NCs to water and polar alcohols, until now most synthesis approaches inevitably adopted ecounfriendly solvents. It is still a challenge to employ green polar alcohol (ethanol) as a solvent to synthesize CLHP NCs. In this work, we realized the room-temperature in situ synthesis of CsPbBr₃/SiO₂ sol entirely in ethanol by innovatively constructing amine-functionalized silica micelles, which originated from the synergistic effect of 3-aminopropyltriethoxysilane and tetraethylorthosilicate (TEOS) during an acid-catalyzed sol–gel process. The sol exhibited high stability and an absolute photoluminescence quantum yield of 61.9% in ethanol without a further modification process. The light-emitting intensity of the sol preserved for 34 days merely declined to 62.1%. This work sheds light on the less common strategy of directly synthesizing CsPbBr₃ NCs and long-term stable preservation in a strongly polar solvent.