Abstract
Enhanced sensitivity towards volatile carboxylic acid vapors is obtained when the basic, amine-containing polymer, linear poly(ethylenimine), l-PEI, is used as the insulating component in a carbon black-polymer composite vapor detector. Specifically, at a partial pressure of analyte corresponding to 1% of its vapor pressure at room temperature, the signal-to-noise ratio for detection of acetic acid is 103 times larger than that for non-acidic organic vapors. Measurements of the mass uptake, thickness change, and electrical conductivity of such composites have been performed to elucidate the mechanism of this sensitivity enhancement towards volatile carboxylic acid vapors. These data have allowed quantification of the relative contributions of electrical percolation effects, increases in analyte sorption, and charge-induced swelling effects in determining the response characteristics of l-PEI composites.
| Original language | English |
|---|---|
| Pages (from-to) | 329-342 |
| Number of pages | 14 |
| Journal | Sensors and Actuators, B: Chemical |
| Volume | 96 |
| Issue number | 1-2 |
| DOIs | |
| Publication status | Published - Nov 15 2003 |
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Keywords
- Amine-containing
- Analyte
- Percolation effects
ASJC Scopus subject areas
- Analytical Chemistry
- Electrochemistry
- Electrical and Electronic Engineering
Cite this
Mechanism of enhanced sensitivity of linear poly(ethylenimine)-carbon black composite detectors to carboxylic acid vapors. / Tillman, Eric S.; Lewis, Nathan S.
In: Sensors and Actuators, B: Chemical, Vol. 96, No. 1-2, 15.11.2003, p. 329-342.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Mechanism of enhanced sensitivity of linear poly(ethylenimine)-carbon black composite detectors to carboxylic acid vapors
AU - Tillman, Eric S.
AU - Lewis, Nathan S
PY - 2003/11/15
Y1 - 2003/11/15
N2 - Enhanced sensitivity towards volatile carboxylic acid vapors is obtained when the basic, amine-containing polymer, linear poly(ethylenimine), l-PEI, is used as the insulating component in a carbon black-polymer composite vapor detector. Specifically, at a partial pressure of analyte corresponding to 1% of its vapor pressure at room temperature, the signal-to-noise ratio for detection of acetic acid is 103 times larger than that for non-acidic organic vapors. Measurements of the mass uptake, thickness change, and electrical conductivity of such composites have been performed to elucidate the mechanism of this sensitivity enhancement towards volatile carboxylic acid vapors. These data have allowed quantification of the relative contributions of electrical percolation effects, increases in analyte sorption, and charge-induced swelling effects in determining the response characteristics of l-PEI composites.
AB - Enhanced sensitivity towards volatile carboxylic acid vapors is obtained when the basic, amine-containing polymer, linear poly(ethylenimine), l-PEI, is used as the insulating component in a carbon black-polymer composite vapor detector. Specifically, at a partial pressure of analyte corresponding to 1% of its vapor pressure at room temperature, the signal-to-noise ratio for detection of acetic acid is 103 times larger than that for non-acidic organic vapors. Measurements of the mass uptake, thickness change, and electrical conductivity of such composites have been performed to elucidate the mechanism of this sensitivity enhancement towards volatile carboxylic acid vapors. These data have allowed quantification of the relative contributions of electrical percolation effects, increases in analyte sorption, and charge-induced swelling effects in determining the response characteristics of l-PEI composites.
KW - Amine-containing
KW - Analyte
KW - Percolation effects
UR - http://www.scopus.com/inward/record.url?scp=0242657619&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0242657619&partnerID=8YFLogxK
U2 - 10.1016/S0925-4005(03)00567-7
DO - 10.1016/S0925-4005(03)00567-7
M3 - Article
AN - SCOPUS:0242657619
VL - 96
SP - 329
EP - 342
JO - Sensors and Actuators, B: Chemical
JF - Sensors and Actuators, B: Chemical
SN - 0925-4005
IS - 1-2
ER -