Supplement Number 1, Supplement Number 2, Supplement Number 3, Supplement Number 4, Supplement Number 5, Supplement Number 6

Particle size and absorbance of WS2-PVP NSs, The optical Z-scan results, Schematic illustration of the experiment system, The system lateral resolution, Deep tissue-mimicking PA imaging of monolayer WS2-PVP NSs, In vivo characterization of PA imaging by using monolayer WS2-PVP NSs on mouse models