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Open Access Research Article

Gas sensor for NH3 and NO2 gases : Analyzing optical dielectric constants in real and imaginary domains

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pp. 183–193Vol. 28Issue 1February 2025DOI: 10.47974/JIM-1848XML
Received:
05 Jun 2024
Published Online:
13 Feb 2025
Article type:
Research Article
Language:
EN
Article no.:
JIM-1848
Pages:
183–193

Abstract

In this work, thin-film sample preparation was performed using the pulse laser deposition method used pressure around 5 tons of CZTS to make pellets. We prepared the films using a neodymium-YAG laser with an energy of 700 mJ. We created the plasma plume by using a number of pulses (200, 250, 300, 350, and 400) at a rate of 6 Hz. calculated the optical constants, including the refractive index, extinction coefficient, and dielectric constant, for the prepared films. The extinction coefficient and refractive index both go up. The behavior of (εr) is similar to that of the refractive index (n) because (k2) is less than (n2), but (εi) is mostly affected by the value of the extinction coefficient (k). At operational temperatures (250 oC), the films were tested as gas sensors against NH3 and NO2 gases. Additionally, the sensitivity of films to these gases decreases with increasing temperatures. The fluctuation in the operating temperature of the films has significantly reduced the sensor’s sensitivity, causing this alteration. At its operational temperature, the gas sensor displayed a gradual increase in response time but a steady decrease in recovery time.

Keywords

Subject Classifications

34A25

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