Modified CuO surface appropriate for selective CO gas sensing at CuO/ZnO heterocontact

Sang Jin Jung, Yoshinobu Nakamura, Akira Kishimoto, Hiroaki Yanagida

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The surface properties of copper oxide (CuO) were discussed for considering the working mechanism of a CuO/ZnO heterocontact gas sensor having carbon monoxide(CO) gas selectivity. We focused on p-type semiconducting CuO, using sodium as a dopant, which is a key material for selective CO gas sensing and its surface properties were characterized by XPS, TPD and FT-IR analyses. It was found that the Cu/O ratio of the 1 mol% Na2CO3-added CuO surface was higher than that of pure CuO surface by XPS analysis. By TPD analysis, it was found that CO was adsorbed more strongly on 1 mol% Na2CO3-added CuO than on pure CuO. By the in situ IR measurement of CO adsorbed on the surface of 1 mol% Na2CO3-added CuO specimen under 300°C, we found two asymmetric bands of CO, whereas an asymmetric streching CO2 band was found on IR measurement of pure CuO specimen. It was confirmed that Cu atoms on pure CuO surface exposed to CO at 300°C changed from Cu2+ to Cu1+ + or Cu0, in contrast to Cu atoms on 1 mol% Na2CO3-added CuO surface, which changed to Cu2+. The electrical conductivity was measured as a function of temperature for pure CuO, CuO with 1 mol% Na2CO3 and ZnO specimens. The resistivity of ZnO was larger than that of pure CuO and CuO with 1 mol% Na2CO3 by three and six orders of magnitude at 250°C, respectively. A working mechanism of CuO (Na)/ZnO heterocontact gas sensor was elucidated in order to explain its high CO selectivity.

Original languageEnglish
Pages (from-to)415-421
Number of pages7
JournalNippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
Volume104
Issue number5
Publication statusPublished - 1996
Externally publishedYes

Fingerprint

Carbon Monoxide
Carbon monoxide
carbon monoxide
Gases
gases
Temperature programmed desorption
Chemical sensors
surface properties
Surface properties
X ray photoelectron spectroscopy
selectivity
Atoms
electrical resistivity
Copper oxides
sensors
copper oxides
atoms
Sodium
Doping (additives)
sodium

Keywords

  • Carbon monoxide
  • Copper oxide
  • Gas selectivity
  • Gas sensor
  • Heterocontact
  • Zinc oxide

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Modified CuO surface appropriate for selective CO gas sensing at CuO/ZnO heterocontact. / Jung, Sang Jin; Nakamura, Yoshinobu; Kishimoto, Akira; Yanagida, Hiroaki.

In: Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan, Vol. 104, No. 5, 1996, p. 415-421.

Research output: Contribution to journalArticle

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abstract = "The surface properties of copper oxide (CuO) were discussed for considering the working mechanism of a CuO/ZnO heterocontact gas sensor having carbon monoxide(CO) gas selectivity. We focused on p-type semiconducting CuO, using sodium as a dopant, which is a key material for selective CO gas sensing and its surface properties were characterized by XPS, TPD and FT-IR analyses. It was found that the Cu/O ratio of the 1 mol{\%} Na2CO3-added CuO surface was higher than that of pure CuO surface by XPS analysis. By TPD analysis, it was found that CO was adsorbed more strongly on 1 mol{\%} Na2CO3-added CuO than on pure CuO. By the in situ IR measurement of CO adsorbed on the surface of 1 mol{\%} Na2CO3-added CuO specimen under 300°C, we found two asymmetric bands of CO, whereas an asymmetric streching CO2 band was found on IR measurement of pure CuO specimen. It was confirmed that Cu atoms on pure CuO surface exposed to CO at 300°C changed from Cu2+ to Cu1+ + or Cu0, in contrast to Cu atoms on 1 mol{\%} Na2CO3-added CuO surface, which changed to Cu2+. The electrical conductivity was measured as a function of temperature for pure CuO, CuO with 1 mol{\%} Na2CO3 and ZnO specimens. The resistivity of ZnO was larger than that of pure CuO and CuO with 1 mol{\%} Na2CO3 by three and six orders of magnitude at 250°C, respectively. A working mechanism of CuO (Na)/ZnO heterocontact gas sensor was elucidated in order to explain its high CO selectivity.",
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N2 - The surface properties of copper oxide (CuO) were discussed for considering the working mechanism of a CuO/ZnO heterocontact gas sensor having carbon monoxide(CO) gas selectivity. We focused on p-type semiconducting CuO, using sodium as a dopant, which is a key material for selective CO gas sensing and its surface properties were characterized by XPS, TPD and FT-IR analyses. It was found that the Cu/O ratio of the 1 mol% Na2CO3-added CuO surface was higher than that of pure CuO surface by XPS analysis. By TPD analysis, it was found that CO was adsorbed more strongly on 1 mol% Na2CO3-added CuO than on pure CuO. By the in situ IR measurement of CO adsorbed on the surface of 1 mol% Na2CO3-added CuO specimen under 300°C, we found two asymmetric bands of CO, whereas an asymmetric streching CO2 band was found on IR measurement of pure CuO specimen. It was confirmed that Cu atoms on pure CuO surface exposed to CO at 300°C changed from Cu2+ to Cu1+ + or Cu0, in contrast to Cu atoms on 1 mol% Na2CO3-added CuO surface, which changed to Cu2+. The electrical conductivity was measured as a function of temperature for pure CuO, CuO with 1 mol% Na2CO3 and ZnO specimens. The resistivity of ZnO was larger than that of pure CuO and CuO with 1 mol% Na2CO3 by three and six orders of magnitude at 250°C, respectively. A working mechanism of CuO (Na)/ZnO heterocontact gas sensor was elucidated in order to explain its high CO selectivity.

AB - The surface properties of copper oxide (CuO) were discussed for considering the working mechanism of a CuO/ZnO heterocontact gas sensor having carbon monoxide(CO) gas selectivity. We focused on p-type semiconducting CuO, using sodium as a dopant, which is a key material for selective CO gas sensing and its surface properties were characterized by XPS, TPD and FT-IR analyses. It was found that the Cu/O ratio of the 1 mol% Na2CO3-added CuO surface was higher than that of pure CuO surface by XPS analysis. By TPD analysis, it was found that CO was adsorbed more strongly on 1 mol% Na2CO3-added CuO than on pure CuO. By the in situ IR measurement of CO adsorbed on the surface of 1 mol% Na2CO3-added CuO specimen under 300°C, we found two asymmetric bands of CO, whereas an asymmetric streching CO2 band was found on IR measurement of pure CuO specimen. It was confirmed that Cu atoms on pure CuO surface exposed to CO at 300°C changed from Cu2+ to Cu1+ + or Cu0, in contrast to Cu atoms on 1 mol% Na2CO3-added CuO surface, which changed to Cu2+. The electrical conductivity was measured as a function of temperature for pure CuO, CuO with 1 mol% Na2CO3 and ZnO specimens. The resistivity of ZnO was larger than that of pure CuO and CuO with 1 mol% Na2CO3 by three and six orders of magnitude at 250°C, respectively. A working mechanism of CuO (Na)/ZnO heterocontact gas sensor was elucidated in order to explain its high CO selectivity.

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