Fig. 4: Interference study of Hg2+ detection.
From: Grain-boundary-rich polycrystalline monolayer WS2 film for attomolar-level Hg2+ sensors
GB-based SPR sensor response (∆θ) to Hg2+ at a fixed concentration (10−15 M) with increasing concentration of interfering ions (Pb2+, Ag+, Zn2+, Fe3+, Ca2+, and Mg2+). S0 is the 10−15 M Hg2+ solution as reference. S1(S2) are the solutions of 10−15 M Hg2+ and Pb2+(Ag+), the Pb2+(Ag+) concentration is varied from 10−15 M to 10−12 M. S3–S6 are the solutions of 10−15 M Hg2+ and one of the naturally abundant interfering Zn2+, Fe3+, Ca2+, and Mg2+ ions, the Zn2+, Fe3+, Ca2+, Mg2+ concentration is varied from 10−8 M to 10−5 M. S7 is the solution of 10−15 M Hg2+ ions and mixed interfering ions of Pb2+, Ag+ at 10−12 M and Zn2+, Fe3+, Ca2+, Mg2+ at 10−5 M. All error bars is the standard deviation of SPR angle shift from five repeated measurements.
