Nanotube-on-graphene heterostructures for three-dimensional nano/bio-interface

Sun Sang Kwon, Jae Hyeok Shin, Jonghyun Choi, SungWoo Nam, Won Il Park

Research output: Contribution to journalArticle

Abstract

We report the synthesis, fabrication, and characterization of a nanotube-on-graphene (NT-on-Gr) field-effect sensor array for electrical detection of the biological activity of living cells. In order to form vertical nanotubes on a graphene surface, Ge/Si core-shell nanowires were vertically grown on graphene, followed by cap opening and Ge core-etching processes. Source-drain current versus water-gate potential measurements in electrolyte solutions with various pH values showed typical gate-dependent ambipolar characteristics with a decrease in pH sensitivity versus that of a flat graphene field-effect sensor. This is associated with limited solution gating of Si nanotubes that form nanoscale fluidic channels and thus interconnect the solution with the graphene field-effect sensor. The Si nanotubes also bridged interconnections between cells and the graphene field effect sensors, which were then able to record electrical spike peaks caused by cell networks.

LanguageEnglish (US)
Pages16-20
Number of pages5
JournalSensors and Actuators, B: Chemical
Volume254
DOIs
StatePublished - Jan 1 2018

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Graphene
Nanotubes
Heterojunctions
nanotubes
graphene
sensors
Sensors
water currents
fluidics
Drain current
Sensor arrays
Fluidics
activity (biology)
Bioactivity
cells
spikes
caps
Electrolytes
Nanowires

Keywords

  • Core-shell nanowire
  • Electrochemical recording
  • Graphene FET
  • Heterostructure
  • Nanotube-on-graphene

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

Cite this

Nanotube-on-graphene heterostructures for three-dimensional nano/bio-interface. / Kwon, Sun Sang; Shin, Jae Hyeok; Choi, Jonghyun; Nam, SungWoo; Park, Won Il.

In: Sensors and Actuators, B: Chemical, Vol. 254, 01.01.2018, p. 16-20.

Research output: Contribution to journalArticle

Kwon, Sun Sang ; Shin, Jae Hyeok ; Choi, Jonghyun ; Nam, SungWoo ; Park, Won Il. / Nanotube-on-graphene heterostructures for three-dimensional nano/bio-interface. In: Sensors and Actuators, B: Chemical. 2018 ; Vol. 254. pp. 16-20.
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