pH sensitive multiwalled carbon nanotubes

Kyongsoo Lee, Jae Hong Kwon, Seung ll Moon, Woo Sung Cho, Byeong Kwon Ju, Yun Hi Lee

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


The CNTs-based sensors have received considerable attention because of their outstanding properties, such as faster response, higher sensitivity, and lower operating temperature. And we expect that CNTs-based electrochemical sensors offer substantial improvements in the performance of pH sensing device. This letter reports experimental results that demonstrate the pH sensing capability of the multiwalled carbon nanotubes (MWCNTs) film by using the thermal chemical vapor deposition (thermal CVD). It was found that electronic properties of MWCNTs can be changed by the introduction of different pH value solutions. The absorption of the hydroxide in pH buffer solution changes conductivity of the MWCNTs. We observed in situ measurement of electrical conductivity by cycling solution range from acid to base.

Original languageEnglish
Pages (from-to)3201-3203
Number of pages3
JournalMaterials Letters
Issue number14-15
Publication statusPublished - 2007 Jun

Bibliographical note

Funding Information:
The project is funded by the ‘Leading edge R&D Program’ of IITA (Institute for Information Technology Advancement) in MIC (Ministry of Information and Communication).


  • Carbon nanotube
  • Chemical vapor deposition
  • Sensor

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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