Correction to: J Nanobiotechnol (2021) 19:284 https://doi.org/10.1186/s12951-021-01018-9

Following publication of the original article [1] the authors have identified an error in Fig. 8 and 9. The correct version of figures are shown below.

Fig. 8
figure 8

X-Ray radiotherapy studies on H1299 tumor models. Animals received one session of treatment on Day 0. a Tumor growth curves. Tumors were measured by monitoring tumor diameter changes at different time points. Compared to X-Ray irradiation alone and pPD-Gd@C-dots injection only, significant tumor suppression was found with animals injected with pPD-Gd@C-dots and X-ray irradiation. b Body weight curves

Fig. 9
figure 9

X-Ray radiotherapy studies on H1299 tumor models. Animals received two doses of treatment on Days 0 and Day 3. a Tumor growth curves. Tumors were measured by monitoring tumor dimension changes at different time points. Compared to X-Ray irradiation alone and pPD-Gd@C-dots injection only, significant tumor suppression was found with animals treated with pPD-Gd@C-dots plus irradiation. b Body weight curves

The authors apologise for this error.