Platinum porphyrin and luminescent polymer for two-color pressure- and temperature-sensing probes

Abstract

Pressure- and temperature-sensitive paint (two-color PSP) using a luminescent polymer of poly[1-(trimethylsilyl)phenyl-2-phenylacetylene] (PTMST) and platinum(II) tetrakis (pentafluorophenyl) porphyrin (PtTFPP) is presented. This polymer uses poly(1-trimethylsilyl-1-propyne) based polymer, which is known as one of the highest gas permeable polymer. The preparation procedure of the PSP is simply to mix PTMST and PtTFPP. The resultant PSP gives two-color luminescence, and provides the pressure and temperature information. The PTMST-dominant peak lies around 500nm, which is temperature-sensitive. The PtTFPP-dominant peak lies around 650nm, which is both pressure- and temperature-sensitive. Spectral analysis as well as the steady- and unsteady-state characterizations is included in this study. Even though a clear spectral separation of the two luminescent peaks is not obtained, the PTMST-dominant peak is only related to the temperature. Due to a high gas permeated polymer, the time response characterized by the time delay of a step change of pressure is roughly said to be on the order of 10ms.