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RESEARCH PRODUCT
Humidity-enhanced sub-ppm sensitivity to ammonia of covalently functionalized single-wall carbon nanotube bundle layers
Ivan I. BobrinetskiyFederica RigoniAleksei V. EmelianovLuigi SangalettiSonia FreddiGiovanni DreraMarcel BouvetJean-moïse SuisseStefania PagliaraA M Malovichkosubject
gas sensingbiasNanoparticle02 engineering and technology01 natural sciencesammoniapolyanilinelaw.inventionchemistry.chemical_compoundAmmonia; breath analysis; carbon nanotubes; environment; gas sensing; humidity; sub-ppmlawPolyanilineGeneral Materials Sciencebreath analysisChemistry (all)[CHIM.MATE]Chemical Sciences/Material chemistry021001 nanoscience & nanotechnologytransductionwirelessMechanics of MaterialsMaterials Science (all)0210 nano-technologyenvironmentMaterials sciencemechanismBioengineeringCarbon nanotubesensor array010402 general chemistrySettore FIS/03 - Fisica della MateriaAdsorptionsub-ppmRelative humidityElectrical and Electronic EngineeringThin filmPolyethylene naphthalateChemiresistorcarbon nanotubesMechanical EngineeringAmmonia; breath analysis; carbon nanotubes; environment; gas sensing; humidity; sub-ppm; Bioengineering; Chemistry (all); Materials Science (all); Mechanics of Materials; Mechanical Engineering; Electrical and Electronic EngineeringhumidityGeneral ChemistrySettore FIS/07 - Fisica Applicata(Beni Culturali Ambientali Biol.e Medicin)0104 chemical sciencesChemical engineeringchemistryadsorptionthin-films[ CHIM.MATE ] Chemical Sciences/Material chemistrynanoparticlesnh3 gas sensitivitydescription
International audience; A low-cost method for carbon nanotubes (CNTs) network production from solutions on flexible polyethylene naphthalate substrates has been adopted to prepare high quality and well characterized SWCNT bundle layers to be used as the active layer in chemiresistor gas sensors. Two types of SWCNTs have been tested: pristine SWCNTs, deposited from a surfactant solution, and covalently functionalized SWCNTs, deposited from a dimethyl-acetamide solution. The humidity effects on the sensitivity of the SWCNTs network to NH3 have been investigated. The results show that relative humidity favors the response to NH3, confirming recent theoretical predictions. The COOH-functionalized sample displays the largest response owing to both its hydrophilic nature, favoring the interaction with H2O molecules, and its largest surface area. Compared to data available in the literature, the present sensors display a remarkable sensitivity well below the ppm range, which makes them quite promising for environmental and medical applications, where NH3 concentrations (mostly of the order of tens of ppb) have to be detected.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-06-23 |