Fig. 1
Characterization of Ti-PDA@SNP-OGP. a Transmission electron microscopy (TEM) images of PDA, PDA@SNP or PDA@SNP-OGP nanoparticles. Scale bar = 100 nm. b Elemental mappings of PDA and PDA@SNP-OGP nanoparticles. Scale bar = 100 nm. c Scanning electron microscopy (SEM) images of Ti, Ti-PDA, Ti-PDA@SNP or Ti-PDA@SNP-OGP. Scale bar = 1 μm. d Water contact angles (WCA) of Ti, Ti-PDA, Ti-PDA@SNP and Ti-PDA@SNP-OGP. e Heating curves of Ti-PDA@SNP-OGP using NIR irradiation with different power intensities. f Heating curves of Ti, Ti-PDA, Ti-PDA@SNP or Ti-PDA@SNP-OGP with NIR irradiation (808 nm, 1.00 W/cm2). g The cumulative concentrations of NO from Ti-PDA@SNP or Ti-PDA@SNP-OGP with or without NIR irradiation (808 nm, 1.00 W/cm2) for 10 min. **P < 0.01; Ti titanium, PDA polydopamine nanoparticles, SNP sodium nitroprusside, OGP osteogenic growth peptide, NO nitric oxide, NIR near-infrared light