Abstract
Herein, a carbon nanotubes-based sensor has been grown for the purpose of ethylene detection. The prepared CNTs had a crystalline structure with a smooth surface of 11.0 nm in diameter and 10.0 µm in length. The low-intensity graphite peak (G-band) as compared to the peak of the defect (D-band) characterizes the defects in the CNTs. An MWNTs-gas sensor was fabricated for monitoring the ethylene gas. The highest response was recorded at a low operating temperature of 30 °C. The sensor was also examined at 300 ppb up to 10 ppm and it showed a response of 2% up to 28%. The sensor response and recovery time constants were varied from 60 to 300 s, depending on the gas concentration. The results that were obtained for the synthetic ethylene gas were also compared with the real measurements for banana ripening. The results confirmed that the sensor is appropriate for the monitoring of fruit ripening.
Highlights
The diameter of the CNTs demonstrated that the CNT is combined with multilayers (MWNTS)
The CNTs were fabricated by plasma-enhanced chemical vapor deposition (PE-CVD), where the Si/SiO2 substrate was coated by the Cr layer, followed by the Ni layer as catalysts
CNTs were indexed as defect-induced MWNTs with a high intensity of D-band when compared to the graphitic G-band
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Avoiding food spoilage, such as that seen in fruits and vegetables, is the strategy of the commercial market. The fruits and vegetables are running quickly toward ripeness if they are exposed to more ethylene gas. The people responsible for transporting the product want to know how the product situation is going, and whether they need to take any action to keep it in a safe condition. The condition of the fruit in various distribution chains is controlled by monitoring the ethylene level at every stage of the journey. The level of ethylene gas that is emitted from the products should be controlled when managing long-term storage
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