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

Cadore, Alisson R.; Mania, Edrian; Alencar, Ananias B; Rezende, Natália P.; Oliveira, Sabrynna Brito; Watanabe, Kenji; Taniguchi, Takashi; Chacham, H.; Campos, Leonardo; Lacerda, Rodrigo G.

doi:10.1016/j.snb.2018.03.164

Cited by 81 publications

(76 citation statements)

References 52 publications

(51 reference statements)

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“…[18][19][20] Recently, LDHs have received great attention as gas sensitive materials due to their high specic surface area and short carrier transport diffusion length. [21][22][23] However, application of pristine LDHs has been hindered due to their low electrical conductivity and tendency to stack easily in the solid state. 24 To overcome these problems, in the present work, EG and LDHs were combined to synthesize a nanomaterial with the advantages of enhanced gas sensitivity, ultra-low detection limit, and improved response and response time, all of which were benecial for practical and commercial application of composite materials.…”

Section: Introductionmentioning

confidence: 99%

Expanded graphite/NiAl layered double hydroxide nanowires for ultra-sensitive, ultra-low detection limits and selective NO_x gas detection at room temperature

Zhang

Ikram

et al. 2019

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

Expanded graphite/NiAl layered double hydroxide nanowires for ultra-sensitive, ultra-low detection limits and selective NO_x gas detection at room temperature

Zhang

Ikram

et al. 2019

RSC Adv.

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“…Also, we observe a dependency of the device recovering time with temperature. [7,14] The sensor response is generally defined as = S I I I . The inset in Figure 2b shows the recovery percentage of intrinsic properties of the MoS 2 FET (Rec) after 1 h of H 2 desorption as a function of the temperature, where the red curve is used only as a guide to the eyes.…”

Section: Resultsmentioning

confidence: 99%

“…[7] Before carrying out electrical measurements under hydrogen exposure, an annealing procedure was performed in all devices presented in this work in Ar atmosphere at 473 K for 12 h. This thermal treatment is known to promote the removal of contaminating gases and humidity. A heater was used to control the temperature inside the chamber in the range of 300-473 K. The H 2 flow was determined by a mass flow controller and dilution with ultrahigh pure argon (Ar) was used to obtain different H 2 concentrations.…”

Section: Methodsmentioning

confidence: 99%

Probing the Electronic Properties of Monolayer MoS₂ via Interaction with Molecular Hydrogen

Rezende

Cadore

Gadelha

et al. 2018

Adv Elect Materials

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This work presents a detailed experimental investigation of the interaction between molecular hydrogen (H2) and monolayer MoS2 field effect transistors (MoS2 FET), aiming for sensing application. The MoS2 FET exhibits a response to H2 that covers a broad range of concentration (0.1–90%) at a relatively low operating temperature range (300–473 K). Most important, H2 sensors based on MoS2 FETs show desirable properties such as full reversibility and absence of catalytic metal dopants (Pt or Pd). The experimental results indicate that the conductivity of MoS2 monotonically increases as a function of the H2 concentration due to a reversible charge transferring process. It is proposed that such process involves dissociative H2 adsorption driven by interaction with sulfur vacancies in the MoS2 surface (VS). This description is in agreement with related density functional theory studies about H2 adsorption on MoS2. Finally, measurements on partially defect‐passivated MoS2 FETs using atomic layer deposited aluminum oxide consist of an experimental indication that the VS plays an important role in the H2 interaction with the MoS2. These findings provide insights for future applications in catalytic process between monolayer MoS2 and H2 and also introduce MoS2 FETs as promising H2 sensors.

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“…Regarding applications in 2D electronics, talc is a compelling insulator media, with a band gap ≈5.3 eV (Figure d) as predicted from density functional theory (DFT), directly competing with well‐established insulators SiO 2 and hBN. Recently, in graphene‐talc devices, spontaneous high p‐type doping of graphene has been observed, as well as excellent charge mobility and the quantum Hall effect …”

Section: Hybrid Polaritons In Graphene‐talc 2d Heterostructuresmentioning

confidence: 99%

Probing Polaritons in 2D Materials with Synchrotron Infrared Nanospectroscopy

Barcelos

Bechtel

Matos

et al. 2019

Advanced Optical Materials

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Polaritons, which are quasiparticles composed of a photon coupled to an electric or magnetic dipole, are a major focus in nanophotonic research of van der Waals (vdW) crystals and their derived 2D materials. For the variety of existing vdW materials, polaritons can be active in a broad range of the electromagnetic spectrum (meVs to eVs) and exhibit momenta much higher than the corresponding free‐space radiation. Hence, the use of high momentum broadband sources or probes is imperative to excite those quasiparticles and measure the frequency‐momentum dispersion relations, which provide insights into polariton dynamics. Synchrotron infrared nanospectroscopy (SINS) is a technique that combines the nanoscale spatial resolution of scattering‐type scanning near‐field optical microscopy with ultrabroadband synchrotron infrared radiation, making it highly suitable to probe and characterize a variety of vdW polaritons. Here, the advances enabled by SINS on the study of key photonic attributes of far‐ and mid‐infrared plasmon‐ and phonon‐polaritons in vdW and 2D crystals are reviewed. In that context the SINS technique is comprehensively described and it is demonstrated how fundamental polaritonic properties are retrieved for a range of atomically thin systems including hBN, MoS2, graphene and 2D heterostructures.

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

Cited by 81 publications

References 52 publications

Expanded graphite/NiAl layered double hydroxide nanowires for ultra-sensitive, ultra-low detection limits and selective NO_x gas detection at room temperature

Expanded graphite/NiAl layered double hydroxide nanowires for ultra-sensitive, ultra-low detection limits and selective NO_x gas detection at room temperature

Probing the Electronic Properties of Monolayer MoS₂ via Interaction with Molecular Hydrogen

Probing Polaritons in 2D Materials with Synchrotron Infrared Nanospectroscopy

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

Cited by 81 publications

References 52 publications

Expanded graphite/NiAl layered double hydroxide nanowires for ultra-sensitive, ultra-low detection limits and selective NOx gas detection at room temperature

Expanded graphite/NiAl layered double hydroxide nanowires for ultra-sensitive, ultra-low detection limits and selective NOx gas detection at room temperature

Probing the Electronic Properties of Monolayer MoS2 via Interaction with Molecular Hydrogen

Probing Polaritons in 2D Materials with Synchrotron Infrared Nanospectroscopy

Contact Info

Product

Resources

About

Expanded graphite/NiAl layered double hydroxide nanowires for ultra-sensitive, ultra-low detection limits and selective NO_x gas detection at room temperature

Expanded graphite/NiAl layered double hydroxide nanowires for ultra-sensitive, ultra-low detection limits and selective NO_x gas detection at room temperature

Probing the Electronic Properties of Monolayer MoS₂ via Interaction with Molecular Hydrogen