Enriching the selectivity of metalloporphyrins chemical sensors by means of optical technique

Ali Umar Akrajas, Muhamad Mat Salleh, Muhammad Yahaya

Research output: Contribution to journalArticle

54 Citations (Scopus)

Abstract

In the electronic nose, the sensing elements must demonstrate high selectivity feature toward various kinds of gases. This paper reports the use of the optical technique to enrich the selectivity of four metallo-octaethyl porphyrins (with the metal atoms of Mn, Fe, Co and Ru) Langmuir-Blodgett (LB) films toward four vapor samples; 2-propanol, ethanol, acetone and cyclohexane. The optical system was developed using these materials as sensing elements and four LED's of different colors; red, yellow, green and blue, as light sources. The sensing sensitivity was based on the change on the light intensity at the peak wavelength of light sources after being reflected by the films. The sensitivity of the films was observed to depend on the wavelength of the light source used and the metal atom at the center of the metalloporphyrins molecules. Each thin film produced four response signals or 16 signals for the whole system for a particular vapor. These 16 signals constituted the pattern of the "signature" of a vapor. The signature of each vapor was found to be different from each other. This work indicated that the amount of the sensing elements used to create a high selectivity gas sensor system may be reduced.

Original languageEnglish
Pages (from-to)191-196
Number of pages6
JournalSensors and Actuators, B: Chemical
Volume85
Issue number3
DOIs
Publication statusPublished - 25 Jul 2002

Fingerprint

Metalloporphyrins
Chemical sensors
selectivity
Vapors
vapors
Light sources
light sources
sensors
Metals
signatures
Wavelength
Atoms
2-Propanol
Langmuir Blodgett films
sensitivity
Porphyrins
Propanol
Cyclohexane
Langmuir-Blodgett films
Acetone

Keywords

  • Langmuir-Blodgett films
  • Metalloporphyrins
  • Optical sensing
  • Selectivity
  • Volatile sensors

ASJC Scopus subject areas

  • Analytical Chemistry
  • Electrochemistry
  • Electrical and Electronic Engineering

Cite this

Enriching the selectivity of metalloporphyrins chemical sensors by means of optical technique. / Akrajas, Ali Umar; Mat Salleh, Muhamad; Yahaya, Muhammad.

In: Sensors and Actuators, B: Chemical, Vol. 85, No. 3, 25.07.2002, p. 191-196.

Research output: Contribution to journalArticle

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