Fig. 7. AuNPs-based optical sensors for food safety monitoring. Inset pictures: colorimetric sensor: reprinted from ref. 72 Copyright 2021, with permission from Elsevier. Fluorescence sensor: reproduced from ref. 145 with permission from The Royal Society of Chemistry, Copyright 2018. SERS sensor: reproduced from ref. 107 with permission from The Royal Society of Chemistry, Copyright 2015.
