Figure 9.

(A) Mechanism of PAI for Cu²⁺ detection. (B) Normalized absorbance spectra of acoustogenic probe for Cu²⁺-2 (APC-2) and its hydrolyzed product (20). (C) PA signal responses of APC-2 to various metal ions. Reproduced with permission ¹²⁶. Copyright 2015 American Chemical Society. (D) The principle of PAI for Li⁺ detection. (E) PA signal responses of nanosensor to Li⁺. (F) In vivo dual wavelength PA images of mice. (G) Ratiometric PA signals (515/660) as a function of time post-injection of Li⁺. Reproduced with permission ¹²⁹. Copyright 2015 American Chemical Society.