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Switching Behaviors of Graphene-Boron Nitride Nanotube Heterojunctions.

ABSTRACT: High electron mobility of graphene has enabled their application in high-frequency analogue devices but their gapless nature has hindered their use in digital switches. In contrast, the structural analogous, h-BN sheets and BN nanotubes (BNNTs) are wide band gap insulators. Here we show that the growth of electrically insulating BNNTs on graphene can enable the use of graphene as effective digital switches. These graphene-BNNT heterojunctions were characterized at room temperature by four-probe scanning tunneling microscopy (4-probe STM) under real-time monitoring of scanning electron microscopy (SEM). A switching ratio as high as 10(5) at a turn-on voltage as low as 0.5 V were recorded. Simulation by density functional theory (DFT) suggests that mismatch of the density of states (DOS) is responsible for these novel switching behaviors.

SUBMITTER: Parashar V

PROVIDER: S-EPMC4507443 | biostudies-literature | 2015 Jul

REPOSITORIES: biostudies-literature

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Switching Behaviors of Graphene-Boron Nitride Nanotube Heterojunctions.

Parashar Vyom V Durand Corentin P CP Hao Boyi B Amorim Rodrigo G RG Pandey Ravindra R Tiwari Bishnu B Zhang Dongyan D Liu Yang Y Li An-Ping AP Yap Yoke Khin YK

Scientific reports 20150720

High electron mobility of graphene has enabled their application in high-frequency analogue devices but their gapless nature has hindered their use in digital switches. In contrast, the structural analogous, h-BN sheets and BN nanotubes (BNNTs) are wide band gap insulators. Here we show that the growth of electrically insulating BNNTs on graphene can enable the use of graphene as effective digital switches. These graphene-BNNT heterojunctions were characterized at room temperature by four-probe ...[more]

PMID: 26192733

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