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Titolo:
Tetraphenylporphine-polymer composite films for optochemical HCl gas sensors. Effects of polymer matrix on sensing characteristics
Autore:
Supriyatno, H; Nakagawa, K; Sadaoka, Y;
Indirizzi:
Ehime Univ, Fac Engn, Dept Mat Sci & Engn, Matsuyama, Ehime 7908577, JapanEhime Univ Matsuyama Ehime Japan 7908577 Matsuyama, Ehime 7908577, Japan Niihama Natl Coll Technol, Dept Ind Chem, Niihama 7920805, Japan Niihama Natl Coll Technol Niihama Japan 7920805 , Niihama 7920805, Japan
Titolo Testata:
ELECTROCHEMISTRY
fascicolo: 5, volume: 67, anno: 1999,
pagine: 431 - 437
SICI:
1344-3542(199905)67:5<431:TCFFOH>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
OPTICAL HUMIDITY; AMMONIA GAS; ETHYLCELLULOSE;
Keywords:
optochemical sensor; UV-visible spectrum; porphine; hydrogen chloride;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
13
Recensione:
Indirizzi per estratti:
Indirizzo: Sadaoka, Y Ehime Univ, Fac Engn, Dept Mat Sci & Engn, Matsuyama, Ehime 7908577, Japan Ehime Univ Matsuyama Ehime Japan 7908577 Ehime 7908577, Japan
Citazione:
H. Supriyatno et al., "Tetraphenylporphine-polymer composite films for optochemical HCl gas sensors. Effects of polymer matrix on sensing characteristics", ELECTROCH, 67(5), 1999, pp. 431-437

Abstract

Changes in the UV-Visible spectra of HCl-sorbed tetraphenylporphine (TPPH42+)-polymer composite films were examined for detection of ppm levels of HCl gas. On exposing the films to HCl gas, the following reversible reaction takes place; TPPH2+2HCl(film) reversible arrow TPPH42+. 2Cl(-). Due to the formation of the dicationic form, the concentration of HCl gas was considered to be determined by the measurement of the absorbance changes. The sensitivity to HCl was discussed on the bases of the sorption models of Freundlich / Langmuir-type, clustering type and Henry's type. Freundlich / Langmuir-type sorption model was applied for the polymer with a higher glass transition temperature. Changes from Freundlich / Langmuir type sorption to clustering type sorption and then Henry's type sorption was observed with a decrease in the glass transition temperature.

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Documento generato il 28/03/20 alle ore 14:06:40