Plasmonic welded single walled carbon nanotubes on monolayer graphene for sensing target protein

Journal Article · Mon May 16 04:00:00 EDT 2016 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4952397· OSTI ID:22590679

Kim, Jangheon; Kim, Soohyun ^[1]; Kim, Gi Gyu; Jung, Wonsuk ^[2]

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1. Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong, Yuseong, Daejeon 305-806 (Korea, Republic of)
2. Department of Mechanical and Automotive Engineering, Wonkwang University, Iksan, Jeonbuk 570-749 (Korea, Republic of)

We developed plasmonic welded single walled carbon nanotubes (SWCNTs) on monolayer graphene as a biosensor to detect target antigen molecules, fc fusion protein without any treatment to generate binder groups for linker and antibody. This plasmonic welding induces atomic networks between SWCNTs as junctions containing carboxylic groups and improves the electrical sensitivity of a SWCNTs and the graphene membrane to detect target protein. We investigated generation of the atomic networks between SWCNTs by field-emission scanning electron microscopy and atomic force microscopy after plasmonic welding process. We compared the intensity ratios of D to G peaks from the Raman spectra and electrical sheet resistance of welded SWCNTs with the results of normal SWCNTs, which decreased from 0.115 to 0.086 and from 10.5 to 4.12, respectively. Additionally, we measured the drain current via source/drain voltage after binding of the antigen to the antibody molecules. This electrical sensitivity of the welded SWCNTs was 1.55 times larger than normal SWCNTs.

• OSTI ID: 22590679
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 20 Vol. 108; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIBODIES
ANTIGENS
ATOMIC FORCE MICROSCOPY
CARBON NANOTUBES
ELECTRIC POTENTIAL
ELECTRON SCANNING
FIELD EMISSION
GRAPHENE
MOLECULES
RAMAN SPECTRA
SCANNING ELECTRON MICROSCOPY
SENSITIVITY
SUPERCONDUCTING JUNCTIONS
WELDED JOINTS
WELDING