Publication detail

Investigation of pristine graphite oxide as room-temperature chemiresistive ammonia gas sensing material

BANNOV, A. PRÁŠEK, J. JAŠEK, O. ZAJÍČKOVÁ, L.

Original Title

Investigation of pristine graphite oxide as room-temperature chemiresistive ammonia gas sensing material

Type

journal article in Web of Science

Language

English

Original Abstract

Graphite oxide has been investigated as a possible room-temperature chemiresistive sensor of ammonia in a gas phase. Graphite oxide was synthesized from high purity graphite using the modified Hummers method. The graphite oxide sample was investigated using scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, thermogravimetry and differential scanning calorimetry. Sensing properties were tested in a wide range of ammonia concentrations in air (10–1000 ppm) and under different relative humidity levels (3%–65%). It was concluded that the graphite oxide–based sensor possessed a good response to NH3 in dry synthetic air (ΔR/R0 ranged from 2.5% to 7.4% for concentrations of 100–500 ppm and 3% relative humidity) with negligible cross-sensitivity towards H2 and CH4. It was determined that the sensor recovery rate was improved with ammonia concentration growth. Increasing the ambient relative humidity led to an increase of the sensor response. The highest response of 22.2% for 100 ppm of ammonia was achieved at a 65% relative humidity level.

Keywords

graphite oxide; chemiresistive gas sensor; sensitivity; ammonia

Authors

BANNOV, A.; PRÁŠEK, J.; JAŠEK, O.; ZAJÍČKOVÁ, L.

Released

9. 2. 2017

Publisher

MDPI AG

Location

Switzerland

ISBN

1424-8220

Periodical

SENSORS

Year of study

17

Number

2

State

Swiss Confederation

Pages from

320

Pages to

329

Pages count

10

URL

http://www.mdpi.com/1424-8220/17/2/320

Full text in the Digital Library

http://hdl.handle.net/11012/63896

BibTex

@article{BUT133632,
  author="Alexander G. {Bannov} and Jan {Prášek} and Ondřej {Jašek} and Lenka {Zajíčková}",
  title="Investigation of pristine graphite oxide as room-temperature chemiresistive ammonia gas sensing material",
  journal="SENSORS",
  year="2017",
  volume="17",
  number="2",
  pages="320--329",
  doi="10.3390/s17020320",
  issn="1424-8220",
  url="http://www.mdpi.com/1424-8220/17/2/320"
}