Integrated Gas Sensing System of SWCNT and Cellulose Polymer Concentrator for Benzene, Toluene, and Xylenes
An integrated cellulose polymer concentrator/single-walled carbon nanotube (SWCNT) sensing system is demonstrated to detect benzene, toluene, and xylenes (BTX) vapors. The sensing system consists of functionalized cellulose as a selective concentrator disposed directly on top of a conductive SWCNT s...
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MDPI AG
2018
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| Online Access: | http://hdl.handle.net/1721.1/113585 https://orcid.org/0000-0002-0512-8236 |
| _version_ | 1826206376366440448 |
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| author | Im, Jisun Sterner, Elizabeth Surles Swager, Timothy M |
| author2 | Massachusetts Institute of Technology. Department of Chemistry |
| author_facet | Massachusetts Institute of Technology. Department of Chemistry Im, Jisun Sterner, Elizabeth Surles Swager, Timothy M |
| author_sort | Im, Jisun |
| collection | MIT |
| description | An integrated cellulose polymer concentrator/single-walled carbon nanotube (SWCNT) sensing system is demonstrated to detect benzene, toluene, and xylenes (BTX) vapors. The sensing system consists of functionalized cellulose as a selective concentrator disposed directly on top of a conductive SWCNT sensing layer. Functionalized cellulose concentrator (top layer) selectively adsorbs the target analyte and delivers the concentrated analyte as near as possible to the SWCNT sensing layer (bottom layer), which enables the simultaneous concentrating and sensing within a few seconds. The selectivity can be achieved by functionalizing cellulose acetate with a pentafluorophenylacetyl selector that interacts strongly with the target BTX analytes. A new design of the integrated cellulose concentrator/SWCNT sensing system allows high sensitivity with limits of detection for benzene, toluene, and m-xylene vapors of 55 ppm, 19 ppm, and 14 ppm, respectively, selectivity, and fast responses ( < 10 s to reach equilibrium), exhibiting the potential ability for on-site, real-time sensing applications. The sensing mechanism involves the selective adsorption of analytes in the concentrator film, which in turn mediates changes in the electronic potentials at the polymer-SWCNT interface and potentially changes in the tunneling barriers between nanotubes. Keywords: cellulose; SWCNT; gas sensor; benzene; concentrator |
| first_indexed | 2024-09-23T13:28:54Z |
| format | Article |
| id | mit-1721.1/113585 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T13:28:54Z |
| publishDate | 2018 |
| publisher | MDPI AG |
| record_format | dspace |
| spelling | mit-1721.1/1135852022-10-01T15:31:21Z Integrated Gas Sensing System of SWCNT and Cellulose Polymer Concentrator for Benzene, Toluene, and Xylenes Im, Jisun Sterner, Elizabeth Surles Swager, Timothy M Massachusetts Institute of Technology. Department of Chemistry Im, Jisun Sterner, Elizabeth Surles Swager, Timothy M An integrated cellulose polymer concentrator/single-walled carbon nanotube (SWCNT) sensing system is demonstrated to detect benzene, toluene, and xylenes (BTX) vapors. The sensing system consists of functionalized cellulose as a selective concentrator disposed directly on top of a conductive SWCNT sensing layer. Functionalized cellulose concentrator (top layer) selectively adsorbs the target analyte and delivers the concentrated analyte as near as possible to the SWCNT sensing layer (bottom layer), which enables the simultaneous concentrating and sensing within a few seconds. The selectivity can be achieved by functionalizing cellulose acetate with a pentafluorophenylacetyl selector that interacts strongly with the target BTX analytes. A new design of the integrated cellulose concentrator/SWCNT sensing system allows high sensitivity with limits of detection for benzene, toluene, and m-xylene vapors of 55 ppm, 19 ppm, and 14 ppm, respectively, selectivity, and fast responses ( < 10 s to reach equilibrium), exhibiting the potential ability for on-site, real-time sensing applications. The sensing mechanism involves the selective adsorption of analytes in the concentrator film, which in turn mediates changes in the electronic potentials at the polymer-SWCNT interface and potentially changes in the tunneling barriers between nanotubes. Keywords: cellulose; SWCNT; gas sensor; benzene; concentrator 2018-02-12T16:47:49Z 2018-02-12T16:47:49Z 2016-02 2015-12 2018-02-08T18:11:37Z Article http://purl.org/eprint/type/JournalArticle 1424-8220 http://hdl.handle.net/1721.1/113585 Im, Jisun et al. “Integrated Gas Sensing System of SWCNT and Cellulose Polymer Concentrator for Benzene, Toluene, and Xylenes.” Sensors 16, 12 (February 2016): 183 © 2016 The Author(s) https://orcid.org/0000-0002-0512-8236 http://dx.doi.org/10.3390/S16020183 Sensors Creative Commons Attribution 4.0 International License http://creativecommons.org/licenses/by/4.0/ application/pdf MDPI AG MDPI |
| spellingShingle | Im, Jisun Sterner, Elizabeth Surles Swager, Timothy M Integrated Gas Sensing System of SWCNT and Cellulose Polymer Concentrator for Benzene, Toluene, and Xylenes |
| title | Integrated Gas Sensing System of SWCNT and Cellulose Polymer Concentrator for Benzene, Toluene, and Xylenes |
| title_full | Integrated Gas Sensing System of SWCNT and Cellulose Polymer Concentrator for Benzene, Toluene, and Xylenes |
| title_fullStr | Integrated Gas Sensing System of SWCNT and Cellulose Polymer Concentrator for Benzene, Toluene, and Xylenes |
| title_full_unstemmed | Integrated Gas Sensing System of SWCNT and Cellulose Polymer Concentrator for Benzene, Toluene, and Xylenes |
| title_short | Integrated Gas Sensing System of SWCNT and Cellulose Polymer Concentrator for Benzene, Toluene, and Xylenes |
| title_sort | integrated gas sensing system of swcnt and cellulose polymer concentrator for benzene toluene and xylenes |
| url | http://hdl.handle.net/1721.1/113585 https://orcid.org/0000-0002-0512-8236 |
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