Detection of ammonia, 2,4,6-trinitrotoluene, and common organic vapors using thin-film carbon black-metalloporphyrin composite chemiresistors

Edgardo García-Berríos, Jordan C. Theriot, Marc D. Woodka, Nathan S Lewis

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Thin-film chemiresistive composites of octaethylporphine-based transition-metal complexes (Ph(M), M = Co, Cu and Zn) and carbon black (CB) have been fabricated and tested as chemical vapor sensors. The sensing performance of such sensor composites was compared to the sensing performance of composites of metallophthalocyanines (Phtc(M)) and CB. The relative differential resistance response of Ph(M)/CB sensor films upon exposure to organic vapors, such as n-hexane, n-heptane, n-octane, iso-octane, cyclohexane, toluene, ethyl acetate and ethanol, was dependent on the nature of the metal center. An array of chemiresistive Ph(M)/CB vapor sensors therefore provided discrimination between the organic vapor analytes that had different polarities, specifically classifying non-polar vapors, aprotic polar vapors and protic polar vapors. However, discrimination was not observed for analytes that had mutually similar polarities. The Ph(M)/CB sensors showed reversible responses toward ammonia, NH3(g), at concentrations below the 8 h permissible exposure level (50 ppm). Ph(M)/CB composites exhibited a slightly larger resistance response than Phtc(M)/CB composites, consistent with the Ph(M) species having less π-stacked molecular aggregates, resulting in an increase in the number of adsorption sites relative to the Phtc(M)/CB composites. Resistance responses with a signal-to-noise ratio value of ∼900 were obtained upon exposure to vapor pulses saturated with 2,4,6-trinitrotoluene.

Original languageEnglish
Pages (from-to)761-767
Number of pages7
JournalSensors and Actuators, B: Chemical
Volume188
DOIs
Publication statusPublished - 2013

Fingerprint

Metalloporphyrins
Trinitrotoluene
Soot
trinitrotoluene
Carbon black
Ammonia
ammonia
Vapors
vapors
Thin films
composite materials
carbon
Composite materials
thin films
sensors
Sensors
octanes
discrimination
polarity
Coordination Complexes

Keywords

  • 2,4,6-Trinitrotoluene
  • Carbon black composites
  • Electronic nose
  • Porphyrins
  • Principal components analysis (PCA)

ASJC Scopus subject areas

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

Cite this

Detection of ammonia, 2,4,6-trinitrotoluene, and common organic vapors using thin-film carbon black-metalloporphyrin composite chemiresistors. / García-Berríos, Edgardo; Theriot, Jordan C.; Woodka, Marc D.; Lewis, Nathan S.

In: Sensors and Actuators, B: Chemical, Vol. 188, 2013, p. 761-767.

Research output: Contribution to journalArticle

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