Search results for "gas sensitivity"

showing 2 items of 2 documents

Bias and humidity effects on the ammonia sensing of perylene derivative/lutetium bisphthalocyanine MSDI heterojunctions

2016

International audience; In this paper, we prepared and studied sensors based on Molecular Semiconductor-Doped Insulator (MSDI) heterojunctions. These original devices are built with two stacked layers of molecular materials and exhibit very specific electrical and sensing properties. We studied the properties of a MSDI composed of the perylenetetracarboxylic dianhydride, PTCDA, or the fluorinated perylenebisimine derivative, C4F7-PTCDI, as n-type molecular material sublayers, and LuPc2 as a p-type semiconductor top layer. Their response to ammonia was compared to that of a resistor formed of only the top layer of the MSDI (LuPc2). Ammonia increases the current in the MSDIs whereas it causes…

MSDIAir quality monitoringAbsorption spectroscopyInorganic chemistryAnalytical chemistryConductometric sensor02 engineering and technology010402 general chemistrysensors[ CHIM ] Chemical Sciences01 natural sciencesLangmuir–Blodgett filmchemistry.chemical_compoundAmmoniaMaterials Chemistry[CHIM]Chemical SciencesRelative humiditygas sensitivitymolecular semiconductorsElectrical and Electronic EngineeringThin filmPerylenetetracarboxylic dianhydrideInstrumentationelectrical-propertiesabsorption-spectracomplexesbusiness.industryfield-effect transistorsMetals and AlloysHeterojunctionRelative humidity021001 nanoscience & nanotechnologyCondensed Matter Physics0104 chemical sciencesSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsphthalocyanineSemiconductorchemistryOrganic heterojunctionthin-filmslangmuir-blodgett0210 nano-technologybusinessPerylene
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Humidity-enhanced sub-ppm sensitivity to ammonia of covalently functionalized single-wall carbon nanotube bundle layers

2017

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-functionaliz…

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 sensitivity
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