The interaction between silver TNPs and anions has been studied by many researchers, for example, researchers found that Cl−could etch the corners and side faces of the silver TNPs, resulting transformation of silver TNPs to disk-like shape [35]. Further studies showed that not only Cl−, anions such as Br−, I−, H2PO4−, and SCN−could also interact with silver TNPs and shift the SPR band of silver TNPs [36,37]. Therefore, Jiang and Yu demonstrated a simple sensing method to detect inorganic anions by SPR shifts of silver TNPs [36]. Huang’s group studied the time-dependent surface plasmon resonance spectroscopy of silver TNPs in the presence of halide.