Al2O3 Nanoparticles Synthesized Using Plant Extracts: Characterization and Application to Glucose Sensing
Source abstract
Abstract
α-Al2O3 nanoparticles (NPs) were sustainably and cost-effectively synthesized using Cinnamomum verum and laurel (Laurus nobilis) leaf extracts (samples J1 and J2, respectively) and characterized in terms of their structural, morphological, optical, and electrochemical properties. Both samples featured the desired hexagonal crystal structure, and the average crystallite sizes of pure Al2O3 , J1, and J2 were determined as approximately 16.90, 32.42, and 32.44 nm, respectively. The X-ray diffraction patterns of J1 and J2 matched the standard diffraction pattern of pure Al2O3. Scanning electron microscopy measurements revealed that J1 and J2 contained well-dispersed uniform-morphology particles with average sizes of 26.33 and 27.9 nm, respectively. Diffuse reflectance spectroscopy measurements revealed that J1 and J2 comprised spherical particles and featured optical band gaps of 4.4 and 4.5 eV, respectively. The Fourier transform infrared spectra of J1 and J2 featured Al–O bond peaks in the range of 500–650 cm−1, and cyclic voltammetry measurements performed for an α-Al2O3 NP electrode revealed its responsiveness to glucose, which was ascribed to a surface-controlled adsorption process. The peak broadening, changes in potential, and charge transfer enhancement observed with increasing glucose concentration suggested that electrochemical behavior was controlled by interfacial contact rather than diffusion. The estimated limit of detection (6 mM) revealed moderate sensitivity to glucose, suggesting the potential utility of α-Al2O3 NPs as an electrode material for electrochemical glucose sensing.
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Research context
OpenAlex topics: Electrochemical sensors and biosensors · Supercapacitor Materials and Fabrication · Carbon and Quantum Dots Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Physics, College of Science, University of Baghdad, 10070 Baghdad, Iraq
Department of Physics, College of Science, Wasit University, 52001 Kut, Iraq
References (37)
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