Polydiacetylene rhodaminebased colorimetric chemosensor for Au detection.

A novel platform of a polydiacetylene combined with rhodamine B () colorimetric chemosensor array was prepared from a diacetylene monomer and rhodamine B derivative. Rhodamine B derivative as the ion-recognition element was embedded in the polydiacetylene matrix. To fabricate chemosensor, diacetylene monomer connected rhodamine B derivatives () was coated onto a filter paper surface via drop-casting technique and transformed to polydiacetylene by polymerisation through ultraviolet (UV) irradiation. From the result, exhibited high sensitivity and selectivity for Au and could be monitored directly by naked eyes providing a fast, portable and easy-to-use as a molecular device in the real system. The DFT calculation results showed a stable complex between and Au. We believe that, this method offers a sensitive and accurate process for Au ion detection in real environmental and biological applications.