In-plane impedancemetric ammonia sensing of solution-deposited, highly semiconductor-enriched single-wall carbon nanotube submonolayer network gas sensors

Hyun Pyo Hong, Joon Hyub Kim, Cheol Jin Lee, Nam Ki Min

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

We present the impedancemetric operation of ammonia gas sensors based on drop-deposited, 99% semiconductor-enriched single-walled carbon nanotube networks. Impedance spectroscopic data for these devices exhibit a complex impedance over a range of frequencies (0.5 Hz to 300 kHz) and are well fit with a proposed equivalent electrical circuit model. The effect of NH<inf>3</inf> on the high-frequency arc resistance is described by a linear law at all NH<inf>3</inf> concentrations, indicating the possibility of utilizing the impedance spectra as the main sensing signal. The impedancemetric operation mode demonstrates a sensitivity of 3.70%/ppm at 3.6-41.4 NH<inf>3</inf> concentration, which is equivalent to an improvement in sensitivity of 2.1 times compared to conventional direct current (dc) measurement. Furthermore, impedancemetric sensing is much less susceptible than conventional dc to noise problems in the very low frequency or dc due to ionic contamination or dissociated NH<inf>3</inf> molecules.

Original languageEnglish
Pages (from-to)27-32
Number of pages6
JournalSensors and Actuators, B: Chemical
Volume220
DOIs
Publication statusPublished - 2015 Jun 8

Fingerprint

Carbon Nanotubes
Electric current measurement
Single-walled carbon nanotubes (SWCN)
Chemical sensors
Ammonia
ammonia
Carbon nanotubes
Contamination
direct current
carbon nanotubes
impedance
Semiconductor materials
Molecules
Networks (circuits)
sensors
gases
very low frequencies
sensitivity
contamination
arcs

Keywords

  • Gas sensor
  • Impedance spectroscopy
  • Impedancemetric detection
  • Semiconductor-enriched SWCNT
  • Sensing mechanism

ASJC Scopus subject areas

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

Cite this

In-plane impedancemetric ammonia sensing of solution-deposited, highly semiconductor-enriched single-wall carbon nanotube submonolayer network gas sensors. / Hong, Hyun Pyo; Kim, Joon Hyub; Lee, Cheol Jin; Min, Nam Ki.

In: Sensors and Actuators, B: Chemical, Vol. 220, 08.06.2015, p. 27-32.

Research output: Contribution to journalArticle

@article{527a92cd1b6e41a899737096e85c0ebf,
title = "In-plane impedancemetric ammonia sensing of solution-deposited, highly semiconductor-enriched single-wall carbon nanotube submonolayer network gas sensors",
abstract = "We present the impedancemetric operation of ammonia gas sensors based on drop-deposited, 99{\%} semiconductor-enriched single-walled carbon nanotube networks. Impedance spectroscopic data for these devices exhibit a complex impedance over a range of frequencies (0.5 Hz to 300 kHz) and are well fit with a proposed equivalent electrical circuit model. The effect of NH3 on the high-frequency arc resistance is described by a linear law at all NH3 concentrations, indicating the possibility of utilizing the impedance spectra as the main sensing signal. The impedancemetric operation mode demonstrates a sensitivity of 3.70{\%}/ppm at 3.6-41.4 NH3 concentration, which is equivalent to an improvement in sensitivity of 2.1 times compared to conventional direct current (dc) measurement. Furthermore, impedancemetric sensing is much less susceptible than conventional dc to noise problems in the very low frequency or dc due to ionic contamination or dissociated NH3 molecules.",
keywords = "Gas sensor, Impedance spectroscopy, Impedancemetric detection, Semiconductor-enriched SWCNT, Sensing mechanism",
author = "Hong, {Hyun Pyo} and Kim, {Joon Hyub} and Lee, {Cheol Jin} and Min, {Nam Ki}",
year = "2015",
month = "6",
day = "8",
doi = "10.1016/j.snb.2015.05.014",
language = "English",
volume = "220",
pages = "27--32",
journal = "Sensors and Actuators, B: Chemical",
issn = "0925-4005",
publisher = "Elsevier",

}

TY - JOUR

T1 - In-plane impedancemetric ammonia sensing of solution-deposited, highly semiconductor-enriched single-wall carbon nanotube submonolayer network gas sensors

AU - Hong, Hyun Pyo

AU - Kim, Joon Hyub

AU - Lee, Cheol Jin

AU - Min, Nam Ki

PY - 2015/6/8

Y1 - 2015/6/8

N2 - We present the impedancemetric operation of ammonia gas sensors based on drop-deposited, 99% semiconductor-enriched single-walled carbon nanotube networks. Impedance spectroscopic data for these devices exhibit a complex impedance over a range of frequencies (0.5 Hz to 300 kHz) and are well fit with a proposed equivalent electrical circuit model. The effect of NH3 on the high-frequency arc resistance is described by a linear law at all NH3 concentrations, indicating the possibility of utilizing the impedance spectra as the main sensing signal. The impedancemetric operation mode demonstrates a sensitivity of 3.70%/ppm at 3.6-41.4 NH3 concentration, which is equivalent to an improvement in sensitivity of 2.1 times compared to conventional direct current (dc) measurement. Furthermore, impedancemetric sensing is much less susceptible than conventional dc to noise problems in the very low frequency or dc due to ionic contamination or dissociated NH3 molecules.

AB - We present the impedancemetric operation of ammonia gas sensors based on drop-deposited, 99% semiconductor-enriched single-walled carbon nanotube networks. Impedance spectroscopic data for these devices exhibit a complex impedance over a range of frequencies (0.5 Hz to 300 kHz) and are well fit with a proposed equivalent electrical circuit model. The effect of NH3 on the high-frequency arc resistance is described by a linear law at all NH3 concentrations, indicating the possibility of utilizing the impedance spectra as the main sensing signal. The impedancemetric operation mode demonstrates a sensitivity of 3.70%/ppm at 3.6-41.4 NH3 concentration, which is equivalent to an improvement in sensitivity of 2.1 times compared to conventional direct current (dc) measurement. Furthermore, impedancemetric sensing is much less susceptible than conventional dc to noise problems in the very low frequency or dc due to ionic contamination or dissociated NH3 molecules.

KW - Gas sensor

KW - Impedance spectroscopy

KW - Impedancemetric detection

KW - Semiconductor-enriched SWCNT

KW - Sensing mechanism

UR - http://www.scopus.com/inward/record.url?scp=84930685505&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84930685505&partnerID=8YFLogxK

U2 - 10.1016/j.snb.2015.05.014

DO - 10.1016/j.snb.2015.05.014

M3 - Article

AN - SCOPUS:84930685505

VL - 220

SP - 27

EP - 32

JO - Sensors and Actuators, B: Chemical

JF - Sensors and Actuators, B: Chemical

SN - 0925-4005

ER -