Detail publikace

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

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

Originální název

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

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

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.

Klíčová slova

graphite oxide; chemiresistive gas sensor; sensitivity; ammonia

Autoři

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

Vydáno

9. 2. 2017

Nakladatel

MDPI AG

Místo

Switzerland

ISSN

1424-8220

Periodikum

SENSORS

Ročník

17

Číslo

2

Stát

Švýcarská konfederace

Strany od

320

Strany do

329

Strany počet

10

URL

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

Plný text v Digitální knihovně

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"
}