Thermal Stability of Epitaxial Graphene Electrodes for Conductive Polymer Nanofiber Devices

Kim, Kyung Ho; Lara‐Avila, Samuel; He, Hans; Park, Yung Woo; Yakimova, Rositsa; Kubatkin, Sergey

doi:10.3390/cryst7120378

Cited by 4 publications

(4 citation statements)

References 64 publications

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“…Graphene, the most prominent member in the family of 2-D materials, has been a good candidate for nanoelectronics owing to its exceptional electronic behaviour -a characteristic quantum Hall effect, high thermal conductivity, high electron mobility, superior elastic strength https://www.indjst.org/ and optical performance, and exploitable thermal stability. However, it is still far from being an ideal material for small scale transistors, owing to the absence of an electronic band gap (12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22) . Efforts focused on finding an alternate material has led to the enhanced prominence of a whole new variety of 2-D materials, among which transition metal dichalcogenides (TMDCs) such as molybdenum disulphide have been quite popular.…”

Section: Introductionmentioning

confidence: 99%

Structural analysis of the chemical vapour deposition grown molybdenum disulphide nanofilms for multifaceted applications

Saini¹

2020

IJST

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Background/Objectives: In recent years, the research on molybdenum disulphide (MoS 2 ) has gained significance because of its unique properties and ease of incorporation in hybrid structures, which makes it one of the most suitable materials for devices and multifaceted Applications. The objective of the study is to synthesize MoS 2 nanofilms and then to characterize them through X-ray diffraction (XRD) technique. Methods: In this study, MoS 2 nanofilms are synthesized on silicon dioxide substrates by the thermal Chemical Vapour Deposition (CVD) technique, where molybdenum trioxide (MoO 3 ) (VI) powder and sulphur (S) flakes are used as precursors. Findings: X-ray diffraction (XRD) measurements have been carried out for the thermal CVD grown MoS 2 nanofilm samples. Further, the observed XRD data has been analyzed and the structural analysis of synthesized MoS 2 nanofilms is presented in this report. Furthermore, the experimentally observed findings are compared with the standard findings and shown that they are resembling closely. Novelty/Applications: In order to highlight the scope of our work, the important applications, of the molybdenum disulphide nanostructures are also discussed, that make MoS 2 nanostructures attractive candidates in fields as diverse as energy, environmental, biomedical and semiconductors.

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Section: Introductionmentioning

confidence: 99%

Structural analysis of the chemical vapour deposition grown molybdenum disulphide nanofilms for multifaceted applications

Saini¹

2020

IJST

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“…We focus on carbonized polyacetylene (CPA) and polyaniline (CPANI) nanofibers as ES-VRH model systems and investigate their magneto conductance (MC) up to H = 14 T as a function of bias voltage and temperature. The carbonized nanofibers become essentially amorphous carbon fibers after pyrolysis of polymer nanofibers at 800 °C 14 , 17 – 22 and show characteristics of the ES-VRH conduction in the temperature and electric field dependence of conductivity 14 . These nano-materials are advantageous 2 , 5 , 14 to study the crossover from thermal to electric field driven transport due to the possibility of applying very large electric fields in realistic experimental conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, because their polymer chain structure is modified during pyrolysis, polymer nanofibers serve as a test bed to explore the effects of polymer structural changes on MC. For PA and PANI nanofibers, pyrolysis at 800 °C results in dehydrogenation and cross-linking of adjacent polymer chains, yielding quasi amorphous, graphite-like carbon fibers 14 , 17 – 22 . In its pristine form, polyaniline (PANI) nanofibers display a finite and negative MC independent of the magnitude of the applied electric field.…”

Section: Introductionmentioning

confidence: 99%

Probing variable range hopping lengths by magneto conductance in carbonized polymer nanofibers

Kim

Lara‐Avila

et al. 2018

Sci Rep

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Using magneto transport, we probe hopping length scales in the variable range hopping conduction of carbonized polyacetylene and polyaniline nanofibers. In contrast to pristine polyacetylene nanofibers that show vanishing magneto conductance at large electric fields, carbonized polymer nanofibers display a negative magneto conductance that decreases in magnitude but remains finite with respect to the electric field. We show that this behavior of magneto conductance is an indicator of the electric field and temperature dependence of hopping length in the gradual transition from the thermally activated to the activation-less electric field driven variable range hopping transport. This reveals magneto transport as a useful tool to probe hopping lengths in the non-linear hopping regime.

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“…Epigraphene is also compatible with operation at temperatures exceeding common industrial requirements. 18,19 Despite these advantages, epigraphene remains relatively unexplored for Hall sensing in literature, 18 possibly owing to the difficulties in tuning carrier density due to high intrinsic n-doping, pinned by the substrate. [20][21][22] We report the exploration of the performance limits of epigraphene Hall sensors for varying doping levels across the Dirac point.…”

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confidence: 99%

The performance limits of epigraphene Hall sensors doped across the Dirac point

Shetty

Kubatkin

et al. 2020

Applied Physics Letters

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Epitaxial graphene on silicon carbide, or epigraphene, provides an excellent platform for Hall sensing devices in terms of both high electrical quality and scalability. However, the challenge in controlling its carrier density has thus far prevented systematic studies of epigraphene Hall sensor performance. In this work we investigate epigraphene Hall sensors where epigraphene is doped across the Dirac point using molecular doping. Depending on the carrier density, molecular-doped epigraphene Hall sensors reach room temperature sensitivities SV=0.23 V/VT, SI=1440 V/AT and magnetic field detection limits down to BMIN=27 nT/√Hz at 20 kHz. Thermally stabilized devices demonstrate operation up to 150 ˚C with SV=0.12 V/VT, SI=300 V/AT and BMIN~100 nT/√Hz at 20 kHz.Based on the classical Hall Effect, solid-state Hall sensors represent a large portion of magnetometers which are extensively used in automotive, marine and consumer electronics applications. Hall sensors based on silicon see widespread use owing to well-established and lowcost production methods, 1-3 but increasing requirements placed on improved magnetic performance or resilience to harsh conditions like high temperatures, demand the exploration of other, even more suitable materials. 4

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Thermal Stability of Epitaxial Graphene Electrodes for Conductive Polymer Nanofiber Devices

Cited by 4 publications

References 64 publications

Structural analysis of the chemical vapour deposition grown molybdenum disulphide nanofilms for multifaceted applications

Structural analysis of the chemical vapour deposition grown molybdenum disulphide nanofilms for multifaceted applications

Probing variable range hopping lengths by magneto conductance in carbonized polymer nanofibers

The performance limits of epigraphene Hall sensors doped across the Dirac point

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