Crumpled graphene oxide decorated sno2 nanocolumns for the electrochemical detection of free chlorine

Thiagarajan Soundappan, Kelsey Haddad, Shalinee Kavadiya, Ramesh Raliya, Pratim Biswas

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


A crumpled graphene oxide–SnO2 nanocolumn (CGO–SnO2) composite electrode was fabricated using aerosol-based techniques. First, SnO2 nanocolumn thin films were fabricated using an aerosol chemical vapor deposition (ACVD) technique. The surface of the nanocolumn was then decorated with CGO by electrospray deposition. The CGO– SnO2 electrode was utilized for the electrochemical detection and determination of the free chlorine concentration in aqueous solutions using linear sweep voltammetry (LSV) and amperometric i–t curve techniques. The CGO–SnO2 electrodes worked through the direct electrochemical reduction of hypochlorite ions (ClO-) on the surface of the electrode, which was used to determine the free chlorine concentration. The electrodes operate over a wide linear range of 0.1–10.08 ppm, with a sensitivity of 2.69 lA lM-1 cm-2. Further, selectivity studies showed that these electrodes easily conquer the electrochemical signals of other common ions in drinking water distribution systems, and only shows the electrochemical reduction signals of free chlorine. Finally, the CGO–SnO2 electrodes were successfully employed for the detection of free chlorine in tap water solutions (St. Louis, MO 63130, USA) with a sensitivity of 5.86 lA lM-1 cm-2. Overall, the sensor fabricated using simple and scalable aerosol-based techniques showed a comparable performance to previous studies on amperometric chlorine sensing using carbon-based electrodes.

Original languageEnglish (US)
Pages (from-to)645-653
Number of pages9
JournalApplied Nanoscience (Switzerland)
Issue number8
StatePublished - Nov 2017
Externally publishedYes


  • Aerosol chemical vapor deposition
  • Chlorine detection
  • Graphene oxide
  • SnO

ASJC Scopus subject areas

  • Biotechnology
  • Atomic and Molecular Physics, and Optics
  • Materials Science (miscellaneous)
  • Physical and Theoretical Chemistry
  • Cell Biology
  • Electrical and Electronic Engineering


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