Nanostructured Diatom-ZrO2 composite as a selective and highly sensitive enzyme free electrochemical sensor for detection of methyl parathion

Krishna Prasad Gannavarapu, V. Ganesh, Megha Thakkar, Somenath Mitra, Rajesh Babu Dandamudi

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

In the current work we report a simple and scalable technique for synthesis of ordered nanoporous Si-ZrO2 composite derived from the diatom Phaeodactylum tricornutum. The composite was well characterized using SEM, TEM-EDX, FTIR, TGA, BET and DLS. The diatom-ZrO2 was found to have a specific surface area of 140 m2/g, Si:Zr ratio of 1:4 and a particle size of 80 ± 2 nm. This composite was evaluated as an enzyme free electrochemical sensor towards the detection of methyl parathion (MP) and showed excellent sensing ability at extremely low detection limits of 54.3 pM and a linear concentration range of 3.4 nM to 64 μM. The diatom-ZrO2 composite was also found to be highly selective towards MP as shown by its response even in the presence of high concentrations of other interfering molecules and ions.

Original languageEnglish (US)
Pages (from-to)611-617
Number of pages7
JournalSensors and Actuators, B: Chemical
Volume288
DOIs
StatePublished - Jun 1 2019

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

Keywords

  • Differential pulse voltammetry
  • Electrochemical sensor
  • Methyl parathion
  • Nanoporous diatom-ZrO

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