Academic Research Journal•2026•DOI: 10.26599/NR.2026.94908666
Low-dimensional semiconductors have attracted widespread attention in next-generation broadband infrared photodetectors due to their tunable band structures, strong light-matter interactions, and compatibility with mixed-dimensional integration. Among them, tellurium (Te) and bismuth selenide (Bi2O2Se) are ideal candidates for high-performance detection owing to their inherent anisotropy, high carrier mobility, and broad spectral response. Constructing heterojunction photodetectors based on these materials enables self-powered operation and suppresses dark current. Heterojunction interface engineering and band structure design are crucial for high-performance Te/Bi2O2Se heterojunction photodetectors. Here, we in-situ construct a one-dimensional (1D) Te/two-dimensional (2D) Bi2O2Se heterojunction via a two-step chemical vapor deposition method, achieving a clear interface and type-II band alignment. The photodetector based on the Te/Bi2O2Se heterojunction, operating in self-driven mode, exhibits high performance: a responsivity of ~0.89 A·W−1 and a fast response time of ~29/41 μs under 1550 nm light irradiation. Furthermore, owing to the optical absorption anisotropy of tellurium, the device demonstrates a high polarization ratio of 2.8 and successfully enables polarization optical communication and polarization imaging applications. This work provides new insights into the in-situ construction strategy for high-quality mixed-dimensional van der Waals heterojunctions and advances high-performance photodetectors and their applications.
Nano-Micro Letters•2025•DOI: 10.1007/s40820-024-01645-5
The integration of dual-mesoporous structures, the construction of heterojunctions, and the incorporation of highly concentrated oxygen vacancies are pivotal for advancing metal oxide-based gas sensors. Nonetheless, achieving an optimal design that simultaneously combines mesoporous structures, precise heterojunction modulation, and controlled oxygen vacancies through a one-step process remains challenging. This study proposes an innovative method for fabricating zinc stannate semiconductors featuring dual-mesoporous structures and tunable oxygen vacancies via a direct solution precursor plasma spray technique. As a proof of concept, the resulting zinc stannate-based coatings are applied to detect 2-undecanone, a key biomarker for rice aging. Remarkably, the zinc oxide/zinc stannate heterojunctions with a well-defined secondary pore structure exhibit exceptional gas-sensing performance for 2-undecanone at room temperature. Furthermore, practical experiments indicate that the developed sensor effectively identifies adulteration in various rice varieties. These results underscore the potential of this method for designing metal oxides with tailored properties for high-performance gas sensors. The enhanced adsorption capacity and dual-mesoporous features of this semiconductor make it a promising candidate for sensing applications in agricultural food safety inspections.
Transactions of Nonferrous Metals Society of China (中国有色金属学报)•2025•DOI: 10.1016/S1003-6326(25)67014-2
The effects of adding a novel Al−3Ti−4.35La master alloy and Nd and heat treatment on the microstructure and mechanical properties of Al−7Si alloy were investigated. The results showed that the secondary dendrite arm spacing of α-Al in the as-cast Al−7Si alloy was refined from 18.3 to 11.9 μm after modification with 0.2 wt.% Al−Ti−La and 0.03 wt.% Nd, and the length of eutectic Si was reduced from 8.6 to 5.0 μm. After heat treatment at 535 °C for 3 h followed by 165 °C for 3 h, the morphology of the eutectic Si became more rounded, and the size decreased. The microhardness, ultimate tensile strength, and elongation were HV 66.1, 184.9 MPa, and 24.4%, respectively, which increased by 24.2%, 11.6%, and 194.0% compared to the as-cast state. The addition of Al−3Ti−4.35La master alloy and Nd can reduce the nucleation temperature of eutectic Si in Al−7Si, thereby suppressing its growth. Notably, the Ti2(Al,Si)20(La,Nd) phase formed in the Al−7Si alloy after the addition of Al−Ti−La and Nd adhered to or coexisted near the eutectic Si particles, inhibiting their growth.
Chinese Journal of Mechanical Engineering•2025•DOI: 10.1186/s10033-025-01237-3
Electronic control suspension (ECS) systems are of significance to ride comfort and handling stability of ground vehicles. However, ECS systems may pose unreasonable safety risks due to performance inadequacies or improper use by drivers, which are referred to as safety of the intended functionality (SOTIF) issues. Aiming to address the inadequate performance of the ECS system, this study proposes a model predictive control (MPC) method, with a particular focus on ensuring SOTIF. First, Systems theoretic process analysis (STPA) is utilized to assess the SOTIF of the ECS system and the ECS system control architecture is built. Then, Models including the input model, lateral and vertical coupled dynamics model, and nonlinear actuator model are established. In addition, an MPC strategy with explicit dynamic constraints is designed, incorporating the dynamic mechanical performance boundaries of ECS actuators into the constraints of the controller. Subsequently, a hardware-in-the-loop testing platform is constructed for the ECS system to conduct simulation experiments under various operating conditions. Results demonstrate that the designed control strategy effectively mitigates performance inadequacies of the suspension system, significantly enhancing its overall functionality and safety.