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Chemically Functionalized Single-Walled Carbon Nanotubes as Ammonia Sensors
- Source :
- The Journal of Physical Chemistry B. 108:19717-19720
- Publication Year :
- 2004
- Publisher :
- American Chemical Society (ACS), 2004.
-
Abstract
- This study demonstrates a novel approach toward development of advanced chemical sensors based on chemically functionalized single-walled carbon nanotubes (SWNTs). SWNTs with covalently attached poly(m-aminobenzene sulfonic acid), SWNT-PABS, have shown improved sensor performance for detection of NH3. Compared to purified SWNTs, devices fabricated with SWNT-PABS have shown more than 2 times higher change of resistance upon exposure to NH3. Importantly, the SWNT-PABS sensors rapidly recover their resistance when NH3 is replaced with nitrogen. Exposure to NH3 induces significant changes in the electronic structure of SWNT-PABS, which allow detection of NH3 at concentrations as low as 5 ppm. Thin film deposited between interdigitated electrodes was explored as a device configuration for development of gas sensors.
- Subjects :
- inorganic chemicals
chemistry.chemical_classification
Materials science
chemistry.chemical_element
Nanotechnology
Carbon nanotube
Electronic structure
Sulfonic acid
Nitrogen
Surfaces, Coatings and Films
law.invention
Ammonia
chemistry.chemical_compound
chemistry
Covalent bond
law
parasitic diseases
Materials Chemistry
Interdigitated electrode
Physical and Theoretical Chemistry
Thin film
Subjects
Details
- ISSN :
- 15205207 and 15206106
- Volume :
- 108
- Database :
- OpenAIRE
- Journal :
- The Journal of Physical Chemistry B
- Accession number :
- edsair.doi...........2d9766ebe00877bc1ea03344f682ec8c