Plasmonic Semiconductor Nanocrystals as Chemical Sensors: Pb2+ Quantitation via Aggregation-Induced Plasmon Resonance Shift Moran Guo§, Wing-Cheung Law§, Xin Liu§, Hongxin Cai, Liwei Liu, Mark T. Swihart, Xihe Zhang, Paras N. Prasad Figure S1. Other metal ions (Cu2+, Gd3+, Mg2+, Zn2+, Cd2+ and Hg2+, 10 µM) were introduced to the Cu2-xS sensor. It shows the selectivity of our design towards heavy-metals.