Highly Green Fluorescent Carbon Dots from Gallic Acid: A Turn-On Sensor toward Pb2+ Ions - Hardeep Kaur; Monika Bhattu; Subhendu Chakroborty; Manpreet Kaur Aulakh; Vishal Mutreja; Meenakshi Verma; Karunesh Tiwari; Chandra Chakraborty; Ibrahim A. Darwish (ACS Omega)