Highly sensitive capacitive gas sensing at ionic liquid-electrode interfaces

Details

• Personal Author:
  Guo M ; Insley T ; Král P ; Mason AJ ; Mu X ; Sen S ; Wang Z ; Zeng X
• Description:
  We have developed an ultrasensitive gas-detection method based on the measurement of a differential capacitance of electrified ionic liquid (IL) electrode interfaces in the presence and absence of adsorbed gas molecules. The observed change of differential capacitance has a local maximum at a certain potential that is unique for each type of gas, and its amplitude is related to the concentration of the gas molecules. We establish and validate this gas-sensing method by characterizing SO2 detection at ppb levels with less than 1.8% signal from other interfering species (i.e., CO2, O2, NO2, NO, SO2, H2O, H2, and cyclohexane, tested at the same concentration as SO2). This study opens a new avenue of utilizing tunable electrified IL-electrode interfaces for selective sensing of molecules with a kinetic size resolution of 0.1 angstroms. [Description provided by NIOSH]
• Subjects:
  Chemistry Occupational Health Safety
• Keywords:
  Chemical Properties Gas Detectors Molecular Biology Molecular Structure Sensors
• ISSN:
  0003-2700
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  Illinois ; Michigan ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  88
• Issue:
  3
• NIOSHTIC Number:
  nn:20048655
• Citation:
  Anal Chem 2016 Feb; 88(3):1959-1964
• Email:
  zeng@oakland.edu
• CAS Registry Number:
  Carbon dioxide (CAS RN 124-38-9) ; Hydrogen (CAS RN 1333-74-0) ; Nitric oxide (CAS RN 10102-43-9) ; Nitrogen dioxide (CAS RN 10102-44-0) ; Oxygen (CAS RN 7782-44-7) ; Sulfur dioxide (CAS RN 7446-09-5)
• Federal Fiscal Year:
  2016
• Performing Organization:
  Oakland University, Rochester, Michigan
• Peer Reviewed:
  True
• Start Date:
  20090801
• Source Full Name:
  Analytical Chemistry
• End Date:
  20120731
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:eeab9207dad779dcf3f1824dbb25466ca7fc5822011ef02a78d26ae55660df67526c2edabc3a363b8c0078ac9f74aa4ee364c29b63ffae30db12e9256df32274
• Download URL:
  https://stacks.cdc.gov/view/cdc/203363/cdc_203363_DS1.pdf
• File Type:
  [PDF - 3.40 MB ]