Abstract
The study demonstrates the fabrication of magnetite (Fe3O4) microspheres (MS) based magneto resistor (MR), for the detection of as low as 10 parts per billion (ppb) nitric oxide (NO) at room temperature. The Fe3O4 MS with a diameter of nearly 430 nm, have been synthesized by a solvothermal method. The MR based gas sensor shows excellent sensitivity, fast response, and high recovery to NO at room temperature. Moreover after the interaction with NO, Fe3O4 MS show an enhanced magnetic moment due to the increase in spin value from Fe $^{2+}$ (s = 2) to Fe $^{3+}$ (s = 5/2). MR sensor exhibits a limit of detection of 1.69 ppb with the highest sensitivity of 14.43% for the detection of 500 ppb of NO, with a response time of 10 to 20 seconds. The work aims to develop a proof-of-concept for the detection of NO using a simple method, and more effort would be needed to refine the device for a biological application.
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