Enhanced Tunneling in a Hybrid of Single-Walled Carbon Nanotubes and Graphene

Yongping Liao; Kimmo Mustonen; Semir Tulić; Viera Skákalová; Sabbir A. Khan; Patrik Laiho; Qiang Zhang; Changfeng Li; Mohammad R.A. Monazam; Jani Kotakoski; Harri Lipsanen; Esko I. Kauppinen

doi:10.1021/acsnano.9b05049

Enhanced Tunneling in a Hybrid of Single-Walled Carbon Nanotubes and Graphene

Yongping Liao
, Kimmo Mustonen^*
, Semir Tulić
, Viera Skákalová
, Sabbir A. Khan
, Patrik Laiho
, Qiang Zhang
, Changfeng Li
, Mohammad R.A. Monazam
, Jani Kotakoski
, Harri Lipsanen
, Esko I. Kauppinen

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

25 Citations (Scopus)

Abstract

Transparent and conductive films (TCFs) are of great technological importance. Their high transmittance, electrical conductivity, and mechanical strength make single-walled carbon nanotubes (SWCNTs) a good candidate for the raw material for TCFs. Despite the ballistic transport in individual SWCNTs, electrical conductivity of SWCNT networks is limited by low efficiency of charge tunneling between the tube elements. Here, we demonstrate that the nanotube network sheet resistance at high optical transmittance is decreased by more than 50% when fabricated on graphene. This is a comparable improvement as that obtained through gold chloride (AuCl₃) doping. However, while Raman spectroscopy reveals substantial changes in spectral features of AuCl₃ doped nanotubes, this does not occur with graphene. Instead, temperature-dependent transport measurements indicate that a graphene substrate reduces the tunneling barrier heights, while its parallel conductivity contribution is almost negligible. Finally, we show that combining the graphene substrate and AuCl₃ doping, brings the SWCNT thin film sheet resistance down to 36 ω/.

Original language	English
Pages (from-to)	11522-11529
Number of pages	8
Journal	ACS Nano
Volume	13
Issue number	10
Early online date	1 Jan 2019
DOIs	https://doi.org/10.1021/acsnano.9b05049
Publication status	Published - 9 Sept 2019
MoE publication type	A1 Journal article-refereed

Funding

This work was supported by the Academy of Finland via projects 286546-DEMEC, 292600-SUPER, 298297-LAMP, 320167-PREIN and 316572-CNTstress, by TEKES Finland via projects 3303/31/2015 (CNT-PV) and 1882/31/2016 (FEDOC), and the Aalto Energy Efficiency (AEF) Research Program through the MOPPI project. The authors also thank the Austrian Science Fund (FWF) for funding under project nos. P 25721-N20, I1283-N20, P 28322-N36, I 2344-N36 and I3181-N36, and K.M. acknowledges support from the Finnish Foundations’ Post Doc Pool. J.K. acknowledges funding from Wiener Wissenschafts-Forschungs- und Technologiefonds through project MA14-009.

Keywords

conductivity
graphene
SWCNT
transparent and conductive films
transport

Access to Document

10.1021/acsnano.9b05049

Cite this

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title = "Enhanced Tunneling in a Hybrid of Single-Walled Carbon Nanotubes and Graphene",

abstract = "Transparent and conductive films (TCFs) are of great technological importance. Their high transmittance, electrical conductivity, and mechanical strength make single-walled carbon nanotubes (SWCNTs) a good candidate for the raw material for TCFs. Despite the ballistic transport in individual SWCNTs, electrical conductivity of SWCNT networks is limited by low efficiency of charge tunneling between the tube elements. Here, we demonstrate that the nanotube network sheet resistance at high optical transmittance is decreased by more than 50\% when fabricated on graphene. This is a comparable improvement as that obtained through gold chloride (AuCl3) doping. However, while Raman spectroscopy reveals substantial changes in spectral features of AuCl3 doped nanotubes, this does not occur with graphene. Instead, temperature-dependent transport measurements indicate that a graphene substrate reduces the tunneling barrier heights, while its parallel conductivity contribution is almost negligible. Finally, we show that combining the graphene substrate and AuCl3 doping, brings the SWCNT thin film sheet resistance down to 36 ω/.",

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AU - Liao, Yongping

AU - Mustonen, Kimmo

AU - Tulić, Semir

AU - Skákalová, Viera

AU - Khan, Sabbir A.

AU - Laiho, Patrik

AU - Zhang, Qiang

AU - Li, Changfeng

AU - Monazam, Mohammad R.A.

AU - Kotakoski, Jani

AU - Lipsanen, Harri

AU - Kauppinen, Esko I.

PY - 2019/9/9

Y1 - 2019/9/9

N2 - Transparent and conductive films (TCFs) are of great technological importance. Their high transmittance, electrical conductivity, and mechanical strength make single-walled carbon nanotubes (SWCNTs) a good candidate for the raw material for TCFs. Despite the ballistic transport in individual SWCNTs, electrical conductivity of SWCNT networks is limited by low efficiency of charge tunneling between the tube elements. Here, we demonstrate that the nanotube network sheet resistance at high optical transmittance is decreased by more than 50% when fabricated on graphene. This is a comparable improvement as that obtained through gold chloride (AuCl3) doping. However, while Raman spectroscopy reveals substantial changes in spectral features of AuCl3 doped nanotubes, this does not occur with graphene. Instead, temperature-dependent transport measurements indicate that a graphene substrate reduces the tunneling barrier heights, while its parallel conductivity contribution is almost negligible. Finally, we show that combining the graphene substrate and AuCl3 doping, brings the SWCNT thin film sheet resistance down to 36 ω/.

AB - Transparent and conductive films (TCFs) are of great technological importance. Their high transmittance, electrical conductivity, and mechanical strength make single-walled carbon nanotubes (SWCNTs) a good candidate for the raw material for TCFs. Despite the ballistic transport in individual SWCNTs, electrical conductivity of SWCNT networks is limited by low efficiency of charge tunneling between the tube elements. Here, we demonstrate that the nanotube network sheet resistance at high optical transmittance is decreased by more than 50% when fabricated on graphene. This is a comparable improvement as that obtained through gold chloride (AuCl3) doping. However, while Raman spectroscopy reveals substantial changes in spectral features of AuCl3 doped nanotubes, this does not occur with graphene. Instead, temperature-dependent transport measurements indicate that a graphene substrate reduces the tunneling barrier heights, while its parallel conductivity contribution is almost negligible. Finally, we show that combining the graphene substrate and AuCl3 doping, brings the SWCNT thin film sheet resistance down to 36 ω/.

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KW - transport

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Enhanced Tunneling in a Hybrid of Single-Walled Carbon Nanotubes and Graphene

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PREIN: Photonics Research and Innovation

CNTstress: Using Carbon Nanotube Materials to Improve the Stress Grading System of an Electrical Machine

2D Layered Materials for Photonics

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Enhanced Tunneling in a Hybrid of Single-Walled Carbon Nanotubes and Graphene

Abstract

Funding

Keywords

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Projects

PREIN: Photonics Research and Innovation

CNTstress: Using Carbon Nanotube Materials to Improve the Stress Grading System of an Electrical Machine

2D Layered Materials for Photonics

Cite this