Influence of surface microstructure on optical response of ruthenium-porphyrins thin films gas sensor

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Abstract

This paper reports an attempt to improve the response of a metalloporphyrin Langmuir-Blodgett films, n-tetraphenyl porphine ruthenium (II) carbonyl, towards several vapor samples by means of surface microstructure modification. Four different surface microstructures were prepared by annealing the thin films samples in air at three different temperatures; 50, 100 and 150°C, for one hour. Three types of vapor samples with different physico-chemical properties, namely saturated vapor of methanol, ethanol and 2-propanol in 15 l/min of air flow, were used. The sensing sensitivity was based on the change in the optical absorption of the film upon exposure towards the gas samples that was measured at a particular wavelength, i.e., 514 nm, of the light source. It was observed that the response of the thin films was influenced by its surface microstructure, which the smoother the surface the higher the response is. The correlation between the microstructure of the films surface and its gas sensing property will be discussed.

Original languageEnglish
Pages (from-to)215-221
Number of pages7
JournalEPJ Applied Physics
Volume29
Issue number3
DOIs
Publication statusPublished - Mar 2005

Fingerprint

Ruthenium
Porphyrins
Chemical sensors
porphyrins
ruthenium
Thin films
microstructure
Microstructure
sensors
thin films
gases
Vapors
vapors
Gases
Metalloporphyrins
2-Propanol
Langmuir Blodgett films
Propanol
air flow
Langmuir-Blodgett films

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

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abstract = "This paper reports an attempt to improve the response of a metalloporphyrin Langmuir-Blodgett films, n-tetraphenyl porphine ruthenium (II) carbonyl, towards several vapor samples by means of surface microstructure modification. Four different surface microstructures were prepared by annealing the thin films samples in air at three different temperatures; 50, 100 and 150°C, for one hour. Three types of vapor samples with different physico-chemical properties, namely saturated vapor of methanol, ethanol and 2-propanol in 15 l/min of air flow, were used. The sensing sensitivity was based on the change in the optical absorption of the film upon exposure towards the gas samples that was measured at a particular wavelength, i.e., 514 nm, of the light source. It was observed that the response of the thin films was influenced by its surface microstructure, which the smoother the surface the higher the response is. The correlation between the microstructure of the films surface and its gas sensing property will be discussed.",
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