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

Authors

Krishna Prasad Gannavarapu, Sri Sathya Sai Institute of Higher Learning
V. Ganesh, Central Electrochemical Research Institute India
Megha Thakkar, New Jersey Institute of Technology
Somenath Mitra, New Jersey Institute of Technology
Rajesh Babu Dandamudi, Sri Sathya Sai Institute of Higher Learning

Document Type

Article

Publication Date

6-1-2019

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.

Identifier

85062808655 (Scopus)

Publication Title

Sensors and Actuators B Chemical

External Full Text Location

https://doi.org/10.1016/j.snb.2019.03.036

ISSN

09254005

First Page

611

Last Page

617

Volume

288

Grant

R01ES023209

Fund Ref

National Institute of Environmental Health Sciences

Recommended Citation

Gannavarapu, Krishna Prasad; Ganesh, V.; Thakkar, Megha; Mitra, Somenath; and Dandamudi, Rajesh Babu, "Nanostructured Diatom-ZrO2 composite as a selective and highly sensitive enzyme free electrochemical sensor for detection of methyl parathion" (2019). Faculty Publications. 7557.
https://digitalcommons.njit.edu/fac_pubs/7557