Mohammed M. Rahman, Sher Bahadar Khan, A. Jamal, M. Faisal, Abdullah M. Asiri, Khalid A. Alamry, Anish Khan, Aftab Aslam Parwaz Khan, Malik Abdul Rub, Naved Azum and Abdulrahman O. Al-Youbi Pages 3 - 13 ( 11 )
Iron oxide nanoparticles (NPs) have been prepared in large-scale by wet-chemical method (150.0 oC and pH 8.33) using ferric chloride and urea as a starting materials in aqueous-alkaline medium. The structural, physical, and optical properties are characterized using FT-IR, UV–vis spectroscopy, Raman spectroscopy, powder X-ray diffraction, Fieldemission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS), and Electron diffraction system (EDS). The NPs size (average dia. 45 ± 5 nm) was measured by FE-SEM while the single phase of NPs were exemplified using powder X-ray diffraction technique. As-grown nanoparticles were applied for the photocatalytic degradation using acridine orange (ACR) and chemical sensing of aqueous ammonia. Almost 58.38% degradation with ACR was observed in presence of nanoparticles under UV sources (250 W). The silver electrode (AgE, surface area, 0.0216 cm2) was immobilized with NPs which enhanced ammonia-sensing performances in their electrical response (I-V characterization) for detecting and quantifying the ammonia in aqueous system. The analytical performances of NPs sensor were investigated that the sensitivity and stability of the sensor improved extensively using NPs thin-film on active silver surface. The calibration plot was linear (R =0.9337) over the large range of 5.0 μM to 0.5 M. The sensitivity was calculated as 4.6154 μAcm-2mM-1 with detection limit (2.5±0.2 μM), based on a signal/noise ratio (3N/S). This study has introduced a novel way for efficient chemical sensor development as well as active photo-catalyst using low-dimensional NPs for the detection of environmental carcinogenic and hazardous compounds.
Iron oxide nanoparicles, Chemi-sensors, Sensitivity, Solution method, Optical properties
Center of Excellence for Advanced Materials Research (CEAMR) & Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia.