In this study, we revealed trap states' impact on MoS₂ photodetector photocurrent changes during optical ON/OFF cycles. Results show trap states significantly affect performance, providing a basis to optimize 2D material-based photodetectors.

A dual-gated WSe ₂ /MoS ₂ phototransistor is fabricated and investigated. Its conduction and rectification characteristics can be tuned by dual gates showing p–i, p–n, i–n and n–n states, due to the charging and depletion of WSe ₂ and MoS ₂ .

This paper investigated the preparation of phosphate glass fibres (PGFs) in the following systems: i) 45P₂O₅-5B₂O₃-5Na₂O-(29-x)CaO-16MgO-(x)Fe₂O₃ and ii) 45P₂O₅-5B₂O₃-5Na₂O-24CaO-(21-x)MgO-(x)Fe₂O₃ (where x = 5, 8 and 11 mol%) for biomedical applications. Continuous fibres of 23 ± 1 μm diameter were prepared via a meltdraw spinning process. Compositions with higher Fe₂O₃ content and higher MgO/CaO ratio required higher melting temperature and longer heating time to achieve glass melts for fibre pulling. The effects of Fe2O3 addition and annealing treatment on mechanical properties and degradation behaviours were also investigated. Adding Fe2O3 was found to increase the tensile strength from 523 ± 63 (Ca-Fe5) to 680 ± 75 MPa (Ca-Fe11), improve the tensile modulus from72 ± 4 (Ca-Fe5) to 78 ± 3 GPa (Ca-Fe11) and decrease the degradation rate from 4.0 (Mg-Fe5) to 1.9 × 10⁻⁶ kg m⁻² s⁻¹ (Mg-Fe11). The annealing process reduced the fibre tensile strength by 46% (Ca-Fe5), increased the modulus by 19.6%(Ca-Fe8) and decreased the degradation rate by 89.5% (Mg-Fe11) in comparison to the corresponding as drawn fibres. Additionally, the annealing process also impeded the formation of precipitate shells and revealed coexistence of the precipitation and the pitting corrosion as fibre degradation behaviours.