Antibiotics are a widely used and effective treatment for bacterial infections. However, bacteria can gradually evolve during infection, leading to developing resistance to antibiotics, which renders previously effective treatments ineffective. Finding a useful and convenient manner to treat bacterial infections is a great challenge. Here, we report a flexible hydrogen-bond-bridged phosphorene film with photodynamic antibacterial properties and excellent mechanical properties, fabricated from electrochemical exfoliation of black phosphorus (BP). When illuminated under 700 nm light, the hydrogen bond-bridged phosphorene flexible film is capable of converting ground-state triplet oxygen (O₂) into excited-state singlet oxygen (¹O₂), destroying the structure of the membrane of Staphylococcus aureus, and eventually leading to bacterial death, via breaking the C=C of unsaturated fatty acids within the bacterial cell membrane after the reaction between ¹O₂ and unsaturated fatty acids, thus realizing a highly efficient antibacterial approach, which is supported by gas chromatography-mass spectrometry (GC-MS) technique. This work establishes an effective phototherapy platform for treating bacterial traumatic infections.

Composite Bi@Bi₂O₃ microspheres have been synthesized via a microwave-assisted solvothermal route. The Bi@Bi₂O₃ microspheres had a narrow size distribution in the range 1.2-2.8 mm. Glucose was selected as the reductant, BiCl₃ as the bismuth source, and ethylene glycol (EG) as the solvent in the synthesis system. The as-synthesized sample was characterized by X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), particle diameter distribution, energy dispersive X-ray spectroscopy (EDS), ultraviolet-visible (UV-vis) spectroscopy, and photoluminescence (PL) spectroscopy. The photocatalytic activities of the Bi@Bi₂O₃ microspheres were evaluated by the photodegradation of rhodamine B (RhB) and methyl orange (MO) dyes under UV light irradiation. The degradation reached ~96.6% for RhB and 100% for MO after 4 h reaction in the presence of the as-synthesized Bi@Bi₂O₃ microspheres.

Single-crystalline Ag₂Se complex nanostructures have been synthesized via a solvothermal route in which selenophene (C₄H₄Se) as a selenylation source reacts with AgNO₃ at a temperature of 240 ℃. An orthorhombic phase β-Ag₂Se nanostructure was identified by X-ray diffraction (XRD), Raman spectroscopy, field emission scanning electron microscopy (FE-SEM), high resolution transmission electron microscopy (HRTEM), and photoluminescence (PL) spectroscopy. The wettability of the as-synthesized β-Ag₂Se nanostructure was studied by measurement of the water contact angle (CA). Static water CA values of over 150° were obtained, which can be attributed to the β-Ag₂Se complex nanostructure having a combination of micro- and nanostructures. The superhydrophobic Ag₂Se nanostructure may find applications in self-cleaning. Additionally, the photocatalytic activity of the as-synthesized β-Ag₂Se nanostructure was evaluated by photodegradation of rhodamine B (RhB) dye under ultraviolet (UV) light irradiation.