Jing Xiao

NiSe@MoS₂ was prepared using a hydrothermal method. Interfacial effects between the two phases lead to electronic restructuring of the interfacial region, resulting in more active sites.

Infrared (IR) to visible up-conversion devices made by incorporating IR detectors with visible emitting units are able to directly convert IR light into visible light.

The MoS₂/NiFeCr LDH is fabricated by hydrothermal method. Utilizing the mutual coupling of interbonded structure and interfacial coupling effect between the catalyst interface, the intrinsic activity was significantly improved.

Currently, SmFeO ₃ ‐based sensors are an effective platform for detecting acetone gas. However, they require high operating temperatures, which increases energy consumption and safety hazards, and their response is low when the gas concentration is at 10 ^–9 (PPB), which cannot meet the requirements of using exhaled breath to pre‐diagnose diabetes. Herein, Pd–SmFeO ₃ hollow nanotubes with an extremely high specific surface area and porosity were synthesized by electrospinning. After Pd doping, the specific surface area improved by more than two times, and the acetone response improved by more than three times. In addition, the response further improved by more than 1.5 times, and the optimum operating temperature reduced by 100 °C under light irradiation. Moreover, the relative humidity adaptability, long‐term stability, and selectivity of the material were significantly improved after Pd doping or light irradiation. Finally, the acetone concentration in a person’s exhaled breath was detected by a Pd‐SmFeO ₃ ‐based gas sensor, and the error was less than 10% compared to that obtained by gas chromatography–mass spectrometry method.

The H₂S concentration in exhaled breath increases marginally with the progress of periodontal disease, and H₂S is considered to be one of the most important gases related to meat and seafood decomposition; however, the concentration of H₂S is low and difficult to detect in such scenarios. In this study, Au–PrFeO₃ nanocrystalline powders with high specific surface areas and porosities were prepared using an electrospinning method. Our experimental results show that loading Au on the material provides an effective way to increase its gas sensitivity. Au doping can decrease the material’s resistance by adjusting its energy band, allowing more oxygen ions to be adsorbed onto the material’s surface due to a spillover effect. Compared with pure PrFeO₃, the response of 3 wt% Au–PrFeO₃ is improved by more than 10 times, and the response time is more than 10 s shorter. In addition, the concentration of H₂S due to the decomposition of shrimp was detected using the designed gas sensor, where the error was less than 15%, compared with that obtained using a GC-MS method. This study fully demonstrates the potential of Au–PrFeO₃ for H₂S concentration detection.

As a typical p-type semiconductor gas-sensing material, LaFeO₃ has good response stability to H₂S, but its responsiveness is low, and the detection limit is not low enough for large-scale use in the field of gas sensors. To obtain better performance, we synthesized Pd modified LaFeO₃ using the sol–gel method. A total of 3 wt% of Pd–LaFeO₃ with a high specific surface area had the highest response to H₂S (36.29–1 ppm) at 120 °C, with relatively fast response–recovery times (19.62/15.22 s), and it had higher selectivity to H₂S with other gases. Finally, we detected the H₂S concentrations in the air around the shrimps, and the H₂S concentrations that we obtained by the 3 wt% Pd–LaFeO₃ in this study were within 10% of those obtained by GC–MS. According to the experimental results, noble-metal surface modification improves the performance of gas-sensing materials, and Pd–LaFeO₃ has considerable potential in H₂S detection.

Since atomically thin two-dimensional (2D) graphene was successfully synthesized in 2004, it has garnered considerable interest due to its advanced properties. However, the weak optical absorption and zero bandgap strictly limit its further development in optoelectronic applications. In this regard, other 2D materials, including black phosphorus (BP), transition metal dichalcogenides (TMDCs), 2D Te nanoflakes, and so forth, possess advantage properties, such as tunable bandgap, high carrier mobility, ultra-broadband optical absorption, and response, enable 2D materials to hold great potential for next-generation optoelectronic devices, in particular, mid-infrared (MIR) band, which has attracted much attention due to its intensive applications, such as target acquisition, remote sensing, optical communication, and night vision. Motivated by this, this article will focus on the recent progress of semiconducting 2D materials in MIR optoelectronic devices that present a suitable category of 2D materials for light emission devices, modulators, and photodetectors in the MIR band. The challenges encountered and prospects are summarized at the end. We believe that milestone investigations of 2D materials beyond graphene-based MIR optoelectronic devices will emerge soon, and their positive contribution to the nano device commercialization is highly expected.

In this study, a carbon-ion beam irradiation method with energy of 6.0 MeV was employed to prepare single-mode optical waveguide structures in LiF single crystal. The results of this study reveal that the visible light and near-infrared laser beams can be well-confined in the irradiated region that is influenced by the irradiation fluences. An end-face coupling system was used to estimate the propagation loss (1.3 dB cm ⁻¹ ) after annealing treatment. The surface damage of the irradiated regions in LiF was analysed based on the displacements per atom calculation using the stopping and range of ions in matter code.

Intermolecular TADF including bulk and interface exciplexes, can be used as emitters to achieve high efficiency, and also as hosts to extend the device lifetime by reducing the triplet exciton concentration and improving charge balance.