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Toward Large Arrays of Multiplex Functionalized Carbon Nanotube Sensors for Highly Sensitive and Selective Molecular Detection
- Source :
- Nano letters. 3(3)
- Publication Year :
- 2022
-
Abstract
- Arrays of electrical devices with each comprising multiple single-walled carbon nanotubes (SWNT) bridging metal electrodes are obtained by chemical vapor deposition (CVD) of nanotubes across prefabricated electrode arrays. The ensemble of nanotubes in such a device collectively exhibits large electrical conductance changes under electrostatic gating, owing to the high percentage of semiconducting nanotubes. This leads to the fabrication of large arrays of low-noise electrical nanotube sensors with 100% yield for detecting gas molecules. Polymer functionalization is used to impart high sensitivity and selectivity to the sensors. Polyethyleneimine coating affords n-type nanotube devices capable of detecting NO2 at less than 1 ppb (parts-per-billion) concentrations while being insensitive to NH3. Coating Nafion (a polymeric perfluorinated sulfonic acid ionomer) on nanotubes blocks NO2 and allows for selective sensing of NH3. Multiplex functionalization of a nanotube sensor array is carried out by microspotti...
- Subjects :
- Nanotube
Materials science
Mechanical Engineering
Bioengineering
Nanotechnology
General Chemistry
Chemical vapor deposition
Carbon nanotube
engineering.material
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
Condensed Matter Physics
law.invention
Condensed Matter::Materials Science
chemistry.chemical_compound
Coating
chemistry
Electrical resistance and conductance
law
Nafion
Electrode
engineering
Surface modification
General Materials Science
Subjects
Details
- ISSN :
- 15306992
- Volume :
- 3
- Issue :
- 3
- Database :
- OpenAIRE
- Journal :
- Nano letters
- Accession number :
- edsair.doi.dedup.....f49ebdceeb73987b3bc31d316df6abcb