Open AccessExploring optical and electrical gas detection based on zinc–tetra-phenyl-porphyrin sensitizer
Author(s) -
Gulimire Tuerdi,
Abliz Yimit,
Xiaoyan Zhang
Publication year - 2022
Publication title -
analytical sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 73
eISSN - 1348-2246
pISSN - 0910-6340
DOI - 10.1007/s44211-022-00103-9
Subject(s) - chemistry , porphyrin , absorbance , ultraviolet , analytical chemistry (journal) , zinc , analyte , infrared , spectrophotometry , adsorption , spectral line , photochemistry , optoelectronics , optics , chromatography , organic chemistry , materials science , physics , astronomy
We developed optical waveguide (OWG), ultraviolet-visible spectrophotometry (UV-vis), and electrically operated gas sensors utilizing zinc-tetra-phenyl-porphyrin (ZnTPP) as sensitizer. Strikingly, ZnTPP thin-film/K + -exchanged glass OWG sensing element exhibits a superior signal-to-noise ratio of 109.6 upon 1 ppm NO 2 gas injection, which is 29.5 and 3.8 times larger than that of UV-vis (absorbance at wavelength of 438 nm) and ZnTPP electrical sensing elements prepared on an alumina ceramic tube, respectively. Further results on Fourier infrared spectra and UV-vis spectra, confirm a strong chemical adsorption of NO 2 gas on ZnTPP. Therefore, our studies highlight the selection of suitable detection technique for analyte sensing with ZnTPP.