@article {Itagaki:2008:1546-198X:864,
title = "Optical pH Determination Using Porphyrin Immobilized Polystyrene Composites",
journal = "Sensor Letters",
parent_itemid = "infobike://asp/senlet",
publishercode ="asp",
year = "2008",
volume = "6",
number = "6",
publication date ="2008-12-01T00:00:00",
pages = "864-867",
itemtype = "ARTICLE",
issn = "1546-198X",
eissn = "1546-1971",
url = "https://www.ingentaconnect.com/content/asp/senlet/2008/00000006/00000006/art00020",
doi = "doi:10.1166/sl.2008.519",
keyword = "SENSOR STABILITY, OPTICAL FIBER, PORPHYRIN IMMOBILIZATION, PH SENSING",
author = "Itagaki, Y. and Yamanaka, S. and Sadaoka, Y.",
abstract = "Optical pH sensors with porphyrin molecules, 5,10,15,20-tetrakis(4-aminophenyl)-21H,23H-porphine (TAPP) and 5,10,15,20-tetra(4-pyridyl)-21H,23H-porphine (TPyP), immobilized on a polystyrene cuvette were fabricated and their sensing properties to the solutions with a pH range of 1.012.5 were examined. The characteristic Soret- (460 nm) and Q-bands (680 nm) of the porphyrin molecules were sensitively changed in its intensity with the change in pH. High sensitivities were obtained for the TAPP sensor both in the Soret- and Q-band regions at pH < 8. The TPyP sensor started to respond in its Soret-band at pH < 6 but significantly high sensitivity was obtained at pH < 3. The TAPP sensor exhibited a fast response and good reproducibility in the pH region. On the other hand, the TPyP sensor was lack of reproducibility in acidic region. Both the sensors exhibited a good stability at pH = 1 owing to the immobilization of the porphyrins.",
}