Enhancing the response of NH3 graphene-sensors by using devices with different graphene-substrate distances

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dc.creatorAlisson Ronieri Cadore
dc.creatorRodrigo Gribel Lacerda
dc.creatorEdrian Mania
dc.creatorAnanias Borges Alencar
dc.creatorNatália Pereira Rezende
dc.creatorSergio de Oliveira
dc.creatorKenji Watanabe
dc.creatorT. Taniguchi
dc.creatorHelio Chacham
dc.creatorLeonardo Cristiano Campos
dc.date.accessioned2024-02-19T17:20:31Z
dc.date.accessioned2025-09-08T23:37:19Z
dc.date.available2024-02-19T17:20:31Z
dc.date.issued2018
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
dc.description.sponsorshipFAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais
dc.description.sponsorshipCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
dc.description.sponsorshipINCT – Instituto nacional de ciência e tecnologia (Antigo Instituto do Milênio)
dc.identifier.doihttps://doi.org/10.1016/j.snb.2018.03.164
dc.identifier.issn1873-3077
dc.identifier.urihttps://hdl.handle.net/1843/64237
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofSensors and Actuators B: Chemical
dc.rightsAcesso Restrito
dc.subjectAmônia
dc.subjectGrafeno
dc.subject.otherAmmonia detection
dc.subject.otherGraphene
dc.subject.otherGas sensor
dc.subject.otherSubstrate engineering
dc.titleEnhancing the response of NH3 graphene-sensors by using devices with different graphene-substrate distances
dc.typeArtigo de periódico
local.citation.epage446
local.citation.spage438
local.citation.volume266
local.description.resumoGraphene (G) is a two-dimensional material with exceptional sensing properties. In general, graphene gas sensors are produced in field effect transistor configuration on several substrates. The role of the substrates on the sensor characteristics has not yet been entirely established. To provide further insight on the interaction between ammonia molecules (NH3) and graphene devices, we report experimental and theoretical studies of NH3 graphene sensors with graphene supported on three substrates: SiO2, talc and hexagonal boron nitride (hBN). Our results indicate that the charge transfer from NH3 to graphene depends not only on extrinsic parameters like temperature and gas concentration, but also on the average distance between the graphene sheet and the substrate. We find that the average distance between graphene and hBN crystals is the smallest among the three substrates, and that graphene-ammonia gas sensors based on a G/hBN heterostructure exhibit the fastest recovery times for NH3 exposure and are slightly affected by wet or dry air environment. Moreover, the dependence of graphene-ammonia sensors on different substrates indicates that graphene sensors exhibit two different adsorption processes for NH3 molecules: one at the top of the graphene surface and another at its bottom side close to the substrate. Therefore, our findings show that substrate engineering is crucial to the development of graphene-based gas sensors and indicate additional routes for faster sensors.
local.identifier.orcidhttps://orcid.org/0000-0003-1081-0915
local.identifier.orcidhttps://orcid.org/0000-0003-4777-7370
local.identifier.orcidhttps://orcid.org/0000-0002-9060-534X
local.identifier.orcidhttps://orcid.org/0000-0002-9146-733X
local.identifier.orcidhttps://orcid.org/0000-0003-3701-8119
local.identifier.orcidhttps://orcid.org/0000-0001-5041-9094
local.identifier.orcidhttps://orcid.org/0000-0001-6792-7554
local.publisher.countryBrasil
local.publisher.departmentICX - DEPARTAMENTO DE FÍSICA
local.publisher.initialsUFMG
local.url.externahttps://www.sciencedirect.com/science/article/pii/S0925400518306622

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