Development of chromogenic reactands for optical sensing of alcohols

Gerhard J. Mohr, Daniel Citterio, Ursula E. Spichiger-Keller

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

A new class of chromogenic reactands (or `chromoreactands') has been synthesized that reversibly interact with alcohols resulting in a change in absorbance. When embedded in plasticized PVC membranes, 4-(N,N-dioctylamino)-4′-trifluoroacetyl-azobenzene (ETHT 4001) shows a significant signal change on exposure to aqueous ethanol solution with a decrease in absorbance at around 490 nm and an increase in absorbance at around 430 nm wavelength. The sensor layer exhibits a dynamic range from 2 to 50 vol% ethanol with highest sensitivity in the 5-35 vol% range. The unit of detection is 1.5 vol%. The absorbance of the sensor membrane is virtually insensitive to changes in pH, however, the magnitude of the relative signal change between plain buffer and buffer containing ethanol is pH dependent. A similar response is observed for 1-(N,N-dioctylamino)-4-(4-trifluoroacetylphenylazo)-naphthalene (ET 4002), however, with the absorbance shifted to longer wavelengths. The behaviour of the reactands dissolved in alcohols correlates with the selectivity of the dyes in the sensor membranes.

Original languageEnglish
Pages (from-to)226-234
Number of pages9
JournalSensors and Actuators, B: Chemical
VolumeB49
Issue number3
Publication statusPublished - 1998 Jul 1
Externally publishedYes

Fingerprint

Chromogenics
alcohols
Alcohols
Ethanol
ethyl alcohol
membranes
Membranes
sensors
Sensors
Buffers
buffers
Wavelength
Azobenzene
Naphthalene
plains
Polyvinyl Chloride
naphthalene
Polyvinyl chlorides
wavelengths
dynamic range

ASJC Scopus subject areas

  • Analytical Chemistry
  • Electrochemistry
  • Electrical and Electronic Engineering

Cite this

Development of chromogenic reactands for optical sensing of alcohols. / Mohr, Gerhard J.; Citterio, Daniel; Spichiger-Keller, Ursula E.

In: Sensors and Actuators, B: Chemical, Vol. B49, No. 3, 01.07.1998, p. 226-234.

Research output: Contribution to journalArticle

Mohr, Gerhard J. ; Citterio, Daniel ; Spichiger-Keller, Ursula E. / Development of chromogenic reactands for optical sensing of alcohols. In: Sensors and Actuators, B: Chemical. 1998 ; Vol. B49, No. 3. pp. 226-234.
@article{da2b6497e92e4629856422b277d1a374,
title = "Development of chromogenic reactands for optical sensing of alcohols",
abstract = "A new class of chromogenic reactands (or `chromoreactands') has been synthesized that reversibly interact with alcohols resulting in a change in absorbance. When embedded in plasticized PVC membranes, 4-(N,N-dioctylamino)-4′-trifluoroacetyl-azobenzene (ETHT 4001) shows a significant signal change on exposure to aqueous ethanol solution with a decrease in absorbance at around 490 nm and an increase in absorbance at around 430 nm wavelength. The sensor layer exhibits a dynamic range from 2 to 50 vol{\%} ethanol with highest sensitivity in the 5-35 vol{\%} range. The unit of detection is 1.5 vol{\%}. The absorbance of the sensor membrane is virtually insensitive to changes in pH, however, the magnitude of the relative signal change between plain buffer and buffer containing ethanol is pH dependent. A similar response is observed for 1-(N,N-dioctylamino)-4-(4-trifluoroacetylphenylazo)-naphthalene (ET 4002), however, with the absorbance shifted to longer wavelengths. The behaviour of the reactands dissolved in alcohols correlates with the selectivity of the dyes in the sensor membranes.",
author = "Mohr, {Gerhard J.} and Daniel Citterio and Spichiger-Keller, {Ursula E.}",
year = "1998",
month = "7",
day = "1",
language = "English",
volume = "B49",
pages = "226--234",
journal = "Sensors and Actuators, B: Chemical",
issn = "0925-4005",
publisher = "Elsevier",
number = "3",

}

TY - JOUR

T1 - Development of chromogenic reactands for optical sensing of alcohols

AU - Mohr, Gerhard J.

AU - Citterio, Daniel

AU - Spichiger-Keller, Ursula E.

PY - 1998/7/1

Y1 - 1998/7/1

N2 - A new class of chromogenic reactands (or `chromoreactands') has been synthesized that reversibly interact with alcohols resulting in a change in absorbance. When embedded in plasticized PVC membranes, 4-(N,N-dioctylamino)-4′-trifluoroacetyl-azobenzene (ETHT 4001) shows a significant signal change on exposure to aqueous ethanol solution with a decrease in absorbance at around 490 nm and an increase in absorbance at around 430 nm wavelength. The sensor layer exhibits a dynamic range from 2 to 50 vol% ethanol with highest sensitivity in the 5-35 vol% range. The unit of detection is 1.5 vol%. The absorbance of the sensor membrane is virtually insensitive to changes in pH, however, the magnitude of the relative signal change between plain buffer and buffer containing ethanol is pH dependent. A similar response is observed for 1-(N,N-dioctylamino)-4-(4-trifluoroacetylphenylazo)-naphthalene (ET 4002), however, with the absorbance shifted to longer wavelengths. The behaviour of the reactands dissolved in alcohols correlates with the selectivity of the dyes in the sensor membranes.

AB - A new class of chromogenic reactands (or `chromoreactands') has been synthesized that reversibly interact with alcohols resulting in a change in absorbance. When embedded in plasticized PVC membranes, 4-(N,N-dioctylamino)-4′-trifluoroacetyl-azobenzene (ETHT 4001) shows a significant signal change on exposure to aqueous ethanol solution with a decrease in absorbance at around 490 nm and an increase in absorbance at around 430 nm wavelength. The sensor layer exhibits a dynamic range from 2 to 50 vol% ethanol with highest sensitivity in the 5-35 vol% range. The unit of detection is 1.5 vol%. The absorbance of the sensor membrane is virtually insensitive to changes in pH, however, the magnitude of the relative signal change between plain buffer and buffer containing ethanol is pH dependent. A similar response is observed for 1-(N,N-dioctylamino)-4-(4-trifluoroacetylphenylazo)-naphthalene (ET 4002), however, with the absorbance shifted to longer wavelengths. The behaviour of the reactands dissolved in alcohols correlates with the selectivity of the dyes in the sensor membranes.

UR - http://www.scopus.com/inward/record.url?scp=0032121072&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0032121072&partnerID=8YFLogxK

M3 - Article

VL - B49

SP - 226

EP - 234

JO - Sensors and Actuators, B: Chemical

JF - Sensors and Actuators, B: Chemical

SN - 0925-4005

IS - 3

ER -