Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : ZnO NRs


Ethanol Gas Sensor Fabrication Based on ZnO Flower Like Nanorods

Abdulqader D. Faisal; Mofeed A. Jaleel; Fahad Z. Kamal

Engineering and Technology Journal, 2020, Volume 38, Issue 3B, Pages 85-97
DOI: 10.30684/etj.v38i3B.279

Zinc oxide flower-like nanorods (ZnO NRs) was successfully synthesized via the hydrothermal method. The growth process was conducted with seed layer concentrations of 20mM. The as-synthesized nanostructures were characterized by x-ray diffraction (XRD), scanning electron microscope (SEM), atomic force microscope (AFM), and ultraviolet-visible (UV-VIS) spectrophotometer. The analysis results revealed a pure Wurtzite ZnO hexagonal nanostructures with preferred orientation (002) along the c-direction. The calculated band gap of average crystallite size is 3.2eV and 25 nm respectively. New designed, constructed and successfully calibrated for ethanol gas sensing was found. The ethanol gas sensor was fabricated at room temperature based on the ZnO NRs film. The synthesized materials proved to be a good candidate for the ethanol gas sensor. The optimum results of the gas sensor measurements of the synthesized gas sensor are as follows, the sensitivity, response time, and recovery time at 25 °C are 60%, 80 Seconds and 80 seconds respectively, and at 200 °C are 70%, 60 seconds and 50 seconds respectively.

Synthesis and Fabrication of ZnO Nanorods on Silicon for Methanol Gas Sensor

Abdulqader D. Faisal; Mofeed A. Jaleel; Fahad Z. Kamal

Engineering and Technology Journal, 2019, Volume 37, Issue 3B, Pages 74-81
DOI: 10.30684/etj.37.3B.2

Zinc Oxide nanorods (ZnO NRs) were successfully synthesized via hydrothermal method. The growth process was conducted with seed layer concentration of 30 mM. The as-synthesized nanostructures were characterized by x-ray diffraction (XRD), scanning electron microscope (SEM), atomic force microscope (AFM), and ultraviolet-visible (UV-VIS) spectrophotometer. The analysis results revealed a pure Wurtzite ZnO hexagonal nanostructures with preferred orientation (002) along c-direction. The calculated band gap and crystallite size are 3.2 eV and 53.18 nm respectively.  A methanol gas sensor was fabricated based on the annealed ZnO NRs on the silicon substrate. Optimized sensitivity at 250 ppm methanol vapor with fast response and recovery time was achieved. So, ZnO NRs film can serve as a good candidate for a methanol gas sensing device.