Nunn Elliott J, Tsioumanis Dimitrios, Fisher Tom B, Roberts David A, Quinn Mark K, Natrajan Louise S
Department of Chemistry, University of Manchester Oxford Road M13 9PL UK
School of Engineering, University of Manchester Oxford Road M13 9PL UK
Chem Sci. 2025 Mar 20;16(16):7018-7025. doi: 10.1039/d5sc00810g. eCollection 2025 Apr 16.
Pressure-sensitive paints (PSPs) are an optical surface pressure sensor for aerodynamic measurements that operates through the oxygen dependent luminescence of a luminophore molecule. The luminophore has remained relatively consistent over the past 20 years, with platinum(ii)/palladium(ii)-5,10,15,20-tetrakis-(2,3,4,5,6-pentafluorphenyl)-porphyrin (Pt/PdTFPP) being popular choices due to their well-known photostability. In this work, NIR-emitting Pt(ii) and Pd(ii) complexes of tetraphenyl tetrabenzoporphyrins and new CF substituted tetraphenyl tetrabenzoporphyrins have been investigated as improved luminophores in PSP formulations for the first time. The red shifted NIR emission spectra of the benzoporphyrins offer a wider and more conveniently placed spectral window than Pt/PdTFPP, creating more of a spectral gap for a secondary temperature-sensitive luminophore to be used in future binary PSPs. The CF substituted Pt(ii) and Pd(ii) benzoporphyrins exhibited substantially increased luminescent brightness over PtTFPP and PdTFPP (5× higher), resulting in signficantly brighter PSP formulations. The benzoporphyrins greatly improved the performance of polystyrene based-PSPs, increasing pressure sensitivity by 20% and decreasing temperature sensitivity by 50%, compared to the current gold standard PtTFPP and PdTFPP.
压敏漆（PSPs）是一种用于空气动力学测量的光学表面压力传感器，它通过发光体分子的氧依赖发光来工作。在过去20年里，发光体一直相对稳定，铂（II）/钯（II）-5,10,15,20-四（2,3,4,5,6-五氟苯基）卟啉（Pt/PdTFPP）因其众所周知的光稳定性而成为常用选择。在这项工作中，首次研究了四苯基四苯并卟啉以及新型CF取代的四苯基四苯并卟啉的近红外发射铂（II）和钯（II）配合物，作为压敏漆配方中性能更优的发光体。与Pt/PdTFPP相比，苯并卟啉的红移近红外发射光谱提供了更宽且位置更便利的光谱窗口，为未来用于二元压敏漆的二次温度敏感发光体创造了更大的光谱间隙。CF取代的铂（II）和钯（II）苯并卟啉的发光亮度比PtTFPP和PdTFPP大幅提高（高出5倍），从而使压敏漆配方的亮度显著增加。与当前的金标准PtTFPP和PdTFPP相比，苯并卟啉极大地改善了基于聚苯乙烯的压敏漆的性能，压力灵敏度提高了20%，温度灵敏度降低了50%。
