A New Polymeric pH Sensor Based on Photophysical Property of Gold Nanoparticle and pH Sensitivity of Poly(sulfadimethoxine methacrylate)

作者：Hong Seok Hwan; Hong Sung Woo; Jo Won Ho^*

来源：Macromolecular Chemistry and Physics, 2010, 211(9): 1054-1060.

DOI：10.1002/macp.200900601

• gold nanoparticle
• pH
• quenching
• sensor
• sulfonamide

A new pH sensor, which consists of a fluorophore and gold nanoparticle (AuNP) attached to each chain end of a pH-sensitive polysulfonamide, respectively, is synthesized, and its pH sensitivity is investigated in terms of the fluorescent quenching efficiency of AuNP. Since the pH-sensitive polymeric linker exhibits a pH-induced coil-globule transition that is rapid enough to show a typical two-state transition, it shows drastic on-and-off quenching efficiency with variation of pH due to the change in the distance between fluorophore and AuNP. This AuNP-based pH sensor exhibits a well-defined on-and-off behavior at a small change in pH, and therefore can be used for an ideal alarm-type sensor.

• 出版日期2010-5-3