Expression of concern: One-step synthesis of biomass-based carbon dots for detection of metal ions and cell imaging

An expression of concern on "One-step Synthesis of Biomass-Based Carbon Dots for Detection of Metal Ions and Cell Imaging" by Citation: Huang X, Liu J, Zhao B, Bai Y, Peng Z, Zhou J, Wang C, Zhao X, Han S and Zhang C (2022) One-step Synthesis of Biomass-Based Carbon Dots for Detection of Metal Ions and Cell Imaging. Front. Energy Res. 10:871617. doi: 10.3389/fenrg.2022.871617 With this notice, Frontiers wishes to alert readers that this article has been identified as being outside the journal's stated scope. In accordance with our publishing policies, we have initiated an investigation. This notice is published for transparency and readers are advised to interpret this work in light of the scope concern. Further editorial action will be determined by the outcome of this investigation, and this notice will be updated when the process concludes.