Erratum: Redox-Activatable and Acid-Enhanced Nanotheranostics for Second Near-Infrared Photoacoustic Tomography and Combined Photothermal Tumor Therapy (ACS Nano (2019) 13:5 (5816-5825) DOI: 10.1021/acsnano.9b01411)

Page 5822. In the section "Modification and TMB/HRP Loading of MSNs" in the Methods section, there is a typo with the concentration of TMB water solution in the description of TMB loading in MSNs. The correct procedure is as follows: For the TMB loading, 1 mL of FAMSN suspension (10 mg/mL) was added in 1 mL of 0.01 M TMB water solution with 10% DMSO, which was sonicated for 10 min and then stirred for 12 h under a N₂ gas atmosphere. The mixture was washed with 50% ethanol and then DI water two times to produce TMB-loaded MSNs. This correction does not influence any of the discussion and conclusions reported in the paper. The authors apologize for any inconvenience caused to the readers.