Ratiometric Photoacoustic Chemical Sensor for Pd<sup>2+</sup> Ion
Jingjing Xiang, Chuangjun Liu, Lihua Zhou, Yang Xing, Ying Li, Yingchun Jiang, Tariq Mahmood, Pengfei Zhang, Ping Gong, Lintao Cai
Abstract
Recently, small molecule photoacoustic sensors have emerged prominently in chem/biosensing owing to their excellent performance of high contrast, high resolution, and deep penetration depth. However, there has been little report on a photoacoustic sensor for Pd2+ detection so far. Herein, a ratiometric photoacoustic Pd2+ sensor, Cy-DPA, based on cyanine fluorophore has been developed. The absorbance peak of Cy-DPA shifts from 710 to 770 nm after the interaction with Pd2+, thus producing a strong PA signal output at 770 nm. As-prepared Cy-DPA could sensing palladium with high sensitivity (27 nM) and selectivity in a fast response (<30 s), which opened new avenue for Pd2+ real-time detection in vivo.