Fig. 6 Efficiency of SDT improved by constructing heterojunction or introducing defects on piezoelectric semiconductor nanomaterials[42-43]
(a) i: Schematic diagram of the preparation and SDT treatment with Au@BP, ii: Time-dependent fluorescence of singlet oxygen sensor green (SOSG) under ultrasound irradiation, iii: Intracellular ROS level after different treatments[42] with (1-6) indicate blank, ultrasound, BP nanosheets, Au@BP nanohybrids, BP nanosheets with ultrasound, and Au@BP nanohybrids with ultrasound, respectively; (b) i: Schematic illustration of D-ZnOx:Gd under ultrasound irradiation, ii: Strucure of defect-free ZnO and defect-rich D-ZnOx:Gd and their adsorption energies with O2 and H2O [43] BP: Black phosphorus; CB: Conduction band; VB: Valence band
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