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Correct Answer :   Both 1 and 2


Recently, the Nanomaterials and Nanoelectronics Laboratory, Department of Physics, Guwahati University, Assam has developed a cost-effective formalin sensor that can effectively detect the presence of formalin in adulterated fishes.

Materials used : Tin oxide-reduced graphene oxide composite (rGO- SnO2).

* While reduced graphene oxide (rGO) has been used to detect various toxic gases and VOCs, tin oxide (SnO2) has been extensively investigated for formaldehyde detection in pristine form and by incorporating it with various compounds, including graphene, due to its high stability and high sensitivity toward low concentrations of formaldehyde.

Process : The Graphene oxide (GO) was processed through wet chemical approach and tin oxide-reduced graphene oxide composite (rGO- SnO2) was synthesized by hydrothermal route followed by calcination of the obtained product.

* They found that the sensor made of tin oxide decorated reduced graphene oxide effectively sensed formaldehyde vapor at room temperature.

* The sensor shows long-term stability with a low detection limit.

* A new low-cost sensor made of metal oxide nanoparticles reduced graphene oxide composite can detect formalin adulteration in fishes at room temperature in a non-invasive way.

* The research for this supported by DST-PURSE (Promotion of University Research and Scientific Excellence).


What is Formaldehyde?

* It is a colourless, pungent gas that is used in a variety of industrial processes, including as a preservative in some foods, commonly in fish in developing countries..

Source : DST

Published On : December 28, 2023
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