Response versus chain length of alkanethiol-capped Au nanoparticle chemiresistive chemical vapor sensors

Edgardo García-Berríos, Ting Gao, Marc D. Woodka, Stephen Maldonado, Bruce S. Brunschwig, Mark W. Ellsworth, Nathan S Lewis

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Au nanoparticles capped with a homologous series of straight chain alkanethiols (containing 4-11 carbons in length) have been investigated as chemiresistive organic vapor sensors. The series of alkanethiols was used to elucidate the mechanisms of vapor detection by such capped nanoparticle chemiresistive films and to highlight the molecular design principles that govern enhanced detection. The thiolated Au nanoparticle chemiresistors demonstrated rapid and reversible responses to a set of test vapors (n-hexane, n-heptane, n-octane, iso-octane, cyclohexane, toluene, ethyl acetate, methanol, ethanol, isopropanol, and 1-butanol) that possessed a variety of analyte physicochemical properties. The resistance sensitivity to nonpolar and aprotic polar vapors systematically increased as the chain length of the capping reagent increased. Decreases in the nanoparticle film resistances, which produced negative values of the differential resistance response, were observed upon exposure of the sensor films to alcohol vapors. The response signals became more negative with higher alcohol vapor concentrations, producing negative values of the sensor sensitivity. Sorption data measured on Au nanoparticle chemiresistor films using a quartz crystal microbalance allowed for the measurement of the partition coefficients of test vapors in the Au nanoparticle films. This measurement assumed that analyte sorption only occurred at the organic interface and not the surface of the Au core. Such an assumption produced partition coefficient values that were independent of the length of the ligand. Furthermore, the value of the partition coefficient was used to obtain the particle-to-particle interfacial effective dielectric constant of films upon exposure to analyte vapors. The values of the dielectric constant upon exposure to alcohol vapors suggested that the observed resistance response changes observed were not significantly influenced by this dielectric change, but rather were primarily influenced by morphological changes and by changes in the interparticle spacing.

Original languageEnglish
Pages (from-to)21914-21920
Number of pages7
JournalJournal of Physical Chemistry C
Volume114
Issue number50
DOIs
Publication statusPublished - Dec 23 2010

Fingerprint

Chain length
Vapors
vapors
Nanoparticles
nanoparticles
sensors
Sensors
partitions
alcohols
Alcohols
octanes
sorption
Sorption
Permittivity
coefficients
permittivity
1-Butanol
2-Propanol
Quartz crystal microbalances
Toluene

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

García-Berríos, E., Gao, T., Woodka, M. D., Maldonado, S., Brunschwig, B. S., Ellsworth, M. W., & Lewis, N. S. (2010). Response versus chain length of alkanethiol-capped Au nanoparticle chemiresistive chemical vapor sensors. Journal of Physical Chemistry C, 114(50), 21914-21920. https://doi.org/10.1021/jp101331g

Response versus chain length of alkanethiol-capped Au nanoparticle chemiresistive chemical vapor sensors. / García-Berríos, Edgardo; Gao, Ting; Woodka, Marc D.; Maldonado, Stephen; Brunschwig, Bruce S.; Ellsworth, Mark W.; Lewis, Nathan S.

In: Journal of Physical Chemistry C, Vol. 114, No. 50, 23.12.2010, p. 21914-21920.

Research output: Contribution to journalArticle

García-Berríos, E, Gao, T, Woodka, MD, Maldonado, S, Brunschwig, BS, Ellsworth, MW & Lewis, NS 2010, 'Response versus chain length of alkanethiol-capped Au nanoparticle chemiresistive chemical vapor sensors', Journal of Physical Chemistry C, vol. 114, no. 50, pp. 21914-21920. https://doi.org/10.1021/jp101331g
García-Berríos E, Gao T, Woodka MD, Maldonado S, Brunschwig BS, Ellsworth MW et al. Response versus chain length of alkanethiol-capped Au nanoparticle chemiresistive chemical vapor sensors. Journal of Physical Chemistry C. 2010 Dec 23;114(50):21914-21920. https://doi.org/10.1021/jp101331g
García-Berríos, Edgardo ; Gao, Ting ; Woodka, Marc D. ; Maldonado, Stephen ; Brunschwig, Bruce S. ; Ellsworth, Mark W. ; Lewis, Nathan S. / Response versus chain length of alkanethiol-capped Au nanoparticle chemiresistive chemical vapor sensors. In: Journal of Physical Chemistry C. 2010 ; Vol. 114, No. 50. pp. 21914-21920.
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