ZnO2 nanohybrid thin film sensor for the detection of ethanol vapour at room temperature using reflectometric interference spectroscopy

Dániel Sebok, I. Dékány

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Reflectometric interference spectroscopy (RIfS) was used to detect ethanol vapour in 10-100 ppm con-centration on the surface of original and modified ZnO2thin films in a gas flow platform. The interferencepattern shift (δλ) caused by the increase of the effective refractive index (in general terms the opticalthickness) of the thin film due to vapour adsorption into the pores was investigated. The effect of noiselevel was reduced by polynomial fitting, hence the limit of detection (LOD) was improved significantly(by half an order of magnitude). Similarly, by surface functionalization (with butyltrichlorosilane, BTS)the sensitivity to ethanol vapour was increased by one order of magnitude (from 0.038 to 0.331 nm/ppm),and the limit of detection improved three-fold as well. The RIfS method was compared to a gravimet-ric technique (quartz crystal microbalance, QCM), and at the same time the adsorbed vapour amount(ns) that gives rise of δλ was investigated: linear δλ vs. nscurves were determined in the 0-60 ppmconcentration range.

Original languageEnglish
Pages (from-to)435-442
Number of pages8
JournalSensors and Actuators, B: Chemical
Volume206
DOIs
Publication statusPublished - 2014

Fingerprint

Ethanol
ethyl alcohol
Vapors
Spectroscopy
vapors
interference
Thin films
sensors
Sensors
room temperature
thin films
spectroscopy
Temperature
Quartz crystal microbalances
quartz crystals
microbalances
gas flow
Flow of gases
Refractive index
polynomials

Keywords

  • Ethanol sensor
  • QCM
  • Reflectometric interference spectroscopy
  • RIfS

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials
  • Metals and Alloys
  • Surfaces, Coatings and Films
  • Materials Chemistry
  • Instrumentation

Cite this

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abstract = "Reflectometric interference spectroscopy (RIfS) was used to detect ethanol vapour in 10-100 ppm con-centration on the surface of original and modified ZnO2thin films in a gas flow platform. The interferencepattern shift (δλ) caused by the increase of the effective refractive index (in general terms the opticalthickness) of the thin film due to vapour adsorption into the pores was investigated. The effect of noiselevel was reduced by polynomial fitting, hence the limit of detection (LOD) was improved significantly(by half an order of magnitude). Similarly, by surface functionalization (with butyltrichlorosilane, BTS)the sensitivity to ethanol vapour was increased by one order of magnitude (from 0.038 to 0.331 nm/ppm),and the limit of detection improved three-fold as well. The RIfS method was compared to a gravimet-ric technique (quartz crystal microbalance, QCM), and at the same time the adsorbed vapour amount(ns) that gives rise of δλ was investigated: linear δλ vs. nscurves were determined in the 0-60 ppmconcentration range.",
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author = "D{\'a}niel Sebok and I. D{\'e}k{\'a}ny",
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AU - Sebok, Dániel

AU - Dékány, I.

PY - 2014

Y1 - 2014

N2 - Reflectometric interference spectroscopy (RIfS) was used to detect ethanol vapour in 10-100 ppm con-centration on the surface of original and modified ZnO2thin films in a gas flow platform. The interferencepattern shift (δλ) caused by the increase of the effective refractive index (in general terms the opticalthickness) of the thin film due to vapour adsorption into the pores was investigated. The effect of noiselevel was reduced by polynomial fitting, hence the limit of detection (LOD) was improved significantly(by half an order of magnitude). Similarly, by surface functionalization (with butyltrichlorosilane, BTS)the sensitivity to ethanol vapour was increased by one order of magnitude (from 0.038 to 0.331 nm/ppm),and the limit of detection improved three-fold as well. The RIfS method was compared to a gravimet-ric technique (quartz crystal microbalance, QCM), and at the same time the adsorbed vapour amount(ns) that gives rise of δλ was investigated: linear δλ vs. nscurves were determined in the 0-60 ppmconcentration range.

AB - Reflectometric interference spectroscopy (RIfS) was used to detect ethanol vapour in 10-100 ppm con-centration on the surface of original and modified ZnO2thin films in a gas flow platform. The interferencepattern shift (δλ) caused by the increase of the effective refractive index (in general terms the opticalthickness) of the thin film due to vapour adsorption into the pores was investigated. The effect of noiselevel was reduced by polynomial fitting, hence the limit of detection (LOD) was improved significantly(by half an order of magnitude). Similarly, by surface functionalization (with butyltrichlorosilane, BTS)the sensitivity to ethanol vapour was increased by one order of magnitude (from 0.038 to 0.331 nm/ppm),and the limit of detection improved three-fold as well. The RIfS method was compared to a gravimet-ric technique (quartz crystal microbalance, QCM), and at the same time the adsorbed vapour amount(ns) that gives rise of δλ was investigated: linear δλ vs. nscurves were determined in the 0-60 ppmconcentration range.

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