Spindle-like Co3O4-ZnO Nanocomposites Scaffold for Hydrazine Sensing and Photocatalytic Degradation of Rhodamine B Dye

Ramesh Kumar,1

Ahmad Umar,2,3*Email

Rajesh Kumar,4

M. S. Chauhan,5*Email

Girish Kumar4 

Suvarcha Chauhan5

1Government College, Rajgarh District, Sirmaur-173101, Himachal Pradesh, India.

2Department of Chemistry, Faculty of Science and Arts, Najran University, Najran-11001, Kingdom of Saudi Arabia.

3Promising Centre for Sensors and Electronic Devices (PCSED), Najran University, Najran-11001, Kingdom of Saudi Arabia.

4Department of Chemistry, JCDAV College Dasuya, Hoshiarpur, Panjab, India, 144205.

5Department of Chemistry, Himachal Pradesh University, Gyan Path, Summer Hill, Shimla-5 India

Abstract

Spindle-like cobalt oxide (Co3O4)-zinc Oxide (ZnO) nanocomposites were synthesized by a facile low-temperature (~60 °C) solution process and well-characterized by several techniques which revealed the presence of Co3O4 along with ZnO in Spindle-like Co3O4-ZnO nanocomposites. The as-synthesized Spindle-like Co3O4-ZnO nanocomposites were analyzed for their photocatalytic and sensing properties. The photocatalytic degradation of the aqueous solution of Rhodamine B (RhB) was evaluated in the presence of Ultraviolet (UV) radiations. About 98% degradation of RhB was observed within just 50 min. The synthesized Co3O4-ZnO nanocomposites displayed prevalent photocatalytic behavior towards the photocatalytic dissociation of RhB under optimal experimental conditions than pure ZnO particles. The sensing studies were carried out by using Co3O4-ZnO nanocomposites modified gold electrode for hydrazine. The modified sensor exhibited good sensitivity of 23.15 µA µM−1cm−2and a low-detection limit of 0.05 µM with a short response time of 2 s for hydrazine. The improved photocatalytic and sensing activities of the Co3O4-ZnO nanocomposites toward photodegradation of RhB and sensing of hydrazine were credited to the associated effects of improved surface area and charge separation efficiencies.

Spindle-like Co3O4-ZnO Nanocomposites Scaffold for Hydrazine Sensing and Photocatalytic Degradation of Rhodamine B Dye