Model of Vapor-Induced Resistivity Changes in Gold-Thiolate Monolayer-Protected Nanoparticle Sensor Films

Details

• Personal Author:
  Rowe MP ; Steinecker WH ; Zellers ET
• Description:
  An investigation of the modulation of charge transport through thin films of n-octanethiolate monolayer-protected gold nanoparticles (MPN) induced by the sorption of organic vapors is presented. A model is derived that allows predictions of MPN-coated chemiresistor (CR) responses from vapor-film partition coefficients, and analyte densities and dielectric constants. Calibrations with vapors of 28 compounds collected from an array of CRs and a parallel thickness-shear-mode resonator are used to verify assumptions inherent in the model and to assess its performance. Results afford insights into the nature of the vapor-MPN interactions, including systematic variations in apparent film swelling efficiencies, and show that the model can predict CR responses typically to within 24%. Using CRs of different dimensions, vapor sensitivities are found to be virtually independent of the MPN film volume over a range of 104 (device-area × MPN layer thickness). Sensitivities vary inversely with analyte vapor pressure similarly for the two sensor types, but the CR sensor affords significantly greater signal-to-noise ratios, yielding calculated detection limits in the low-part-per-billion concentration range for several of the analytes tested. The implications of these results for implementing MPN-coated CR arrays as detectors in microanalytical systems are considered. [Description provided by NIOSH]
• Subjects:
  Environmental Monitoring Occupational Health Safety Solvents Volatilization
• Keywords:
  Air-quality-measurement Air-quality-monitoring Analytical-instruments Analytical-processes Nanotechnology Organic-compounds Sampling-equipment Sampling-methods Vapor-volume Vapors Volumetric-analysis

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• ISSN:
  0003-2700
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  Michigan ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  79
• Issue:
  13
• NIOSHTIC Number:
  nn:20032525
• Citation:
  Anal Chem 2007 Jul; 79(13):4977-4986
• Contact Point Address:
  Center for Wireless Integrated MicroSystems, Department of Chemistry, and Department of Environmental Health Sciences, University of Michigan, 109 South Observatory Street, Ann Arbor, Michigan 48109
• Federal Fiscal Year:
  2007
• Performing Organization:
  University of Michigan, Ann Arbor
• Peer Reviewed:
  True
• Start Date:
  19980930
• Source Full Name:
  Analytical Chemistry
• End Date:
  20060531
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:864c81d5271ced1a4462711a3c3fb30811dbb11b00208b88af96e76ee1956b6c61708373ea8efd6b7b6532529835ffa3172b39464d19541975a26315fdda88b2
• Download URL:
  https://stacks.cdc.gov/view/cdc/186462/cdc_186462_DS1.pdf
• File Type:
  [PDF - 156.63 KB ]