6533b85ffe1ef96bd12c265b
RESEARCH PRODUCT
Two-Dimensional Indium Selenide for Sulphur Vapour Sensing Applications
Rafael Abargues LópezJaume Noguera-gomezJuan F. Sánchez-royoJuan P. Martínez-pastorDaniel Andres-penaresRodolfo Canet-albiachsubject
AnalyteMaterials sciencePhotoluminescencePassivationGeneral Chemical EngineeringDiffusionAnalytical chemistrychemistry.chemical_elementIII-VI semiconductors02 engineering and technology010402 general chemistry01 natural sciencesArticlelcsh:Chemistrychemistry.chemical_compoundPhase (matter)Selenidevapour sensingGeneral Materials ScienceNanosheet021001 nanoscience & nanotechnologytwo-dimensional semiconductors0104 chemical scienceschemistrylcsh:QD1-999InSephotoluminescence0210 nano-technologyIndiumchemical sensordescription
Surface-to-volume ratio in two-dimensional (2D) materials highlights among their characteristics as an inherent and intrinsic advantage taking into account their strong sensitivity to surface effects. For this reason, we have proposed in this work micromechanically exfoliated 2D nanosheets of InSe as an optical vapour sensor. As a proof of concept, we used 2-mercaptoethanol as the chemical analyte in vapour phase to monitor the change of the InSe photoluminescence (PL) before and after exposure to the analyte. For short vapour exposure times (at low analyte concentration), we found a PL enhancement of InSe nanosheets attributed to the surface localization of Se defects. For long vapour exposure times (or higher concentrations) a PL reduction is observed, probably due to the diffusion of molecules within the nanosheet. These results confirm the capability of 2D InSe as a photoluminescent sensor of vapours, because of its sensitivity to surface passivation or volume diffusion of molecules.
year | journal | country | edition | language |
---|---|---|---|---|
2020-07-18 | Nanomaterials |