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Gomaa, Hosam M., et al. Optics & Laser Technology 156 (2022): 108452.
In a recent study, graphene nanopowder has been successfully employed as a dopant in the synthesis of phosphate glass composites, yielding a new class of graphene-phosphate glasses (G-PbO/CaO@P₂O₅). These materials were prepared by introducing varying concentrations of graphene nanopowder into a conventional lead-calcium phosphate glass matrix.
Structural analyses using X-ray diffraction confirmed the amorphous nature of the resulting composites, while FTIR spectroscopy indicated the chemical incorporation of graphene through the formation of C-O bonds. Notably, increased graphene content led to a reduction in terminal oxygen atoms, implying enhanced glass network connectivity. Optical studies further revealed that graphene addition induces a blue shift in the absorption edge and boosts the optical transmittance, highlighting the role of graphene in tuning the electronic transitions within the glass matrix.
Advanced modeling using the Hydrogenic Excitonic Model (HEM) and Drude-Lorentz approximation provided valuable insights into the absorption behavior and dielectric loss characteristics. The determined plasma frequency falls within the terahertz range, supporting the potential application of these materials in electromagnetic shielding and telecommunication devices.
Overall, this work demonstrates that graphene nanopowder is a functional additive for tailoring the optical and electronic properties of phosphate glasses, paving the way for its use in photonic and optoelectronic applications.
Bu, Yuan, et al. Journal of energy chemistry 22.5 (2013): 685-689.
Graphene nanopowder has been effectively utilized in the fabrication of a high-performance electrochemical sensor for the simultaneous detection of dopamine and uric acid, even in the presence of ascorbic acid. In this study, a glassy carbon (GC) electrode modified with graphene nanopowder (GN) was prepared via a simple drop-casting method. The GN suspension, formed by ultrasonication of 5 mg GN in ethanol, was coated onto a pre-polished GC electrode and dried under ambient conditions to yield a stable and active sensing platform.
Electrochemical techniques including cyclic voltammetry, linear polarization, and chronoamperometry revealed that the GN-modified electrode significantly enhanced the electrocatalytic oxidation of dopamine and uric acid in phosphate buffer (pH 7.0), compared to the unmodified electrode. The sensor displayed linear response ranges of 3.3-249.1 μmol/L for dopamine and 6.7-386.3 μmol/L for uric acid, with detection limits of 1.5 μmol/L and 2.7 μmol/L, respectively (S/N = 3). Rapid response times of <2 seconds for dopamine and <3 seconds for uric acid were also recorded.
These results confirm that graphene nanopowder is a powerful electroactive material for enhancing sensitivity and selectivity in biosensor applications, particularly for the detection of key neurological and metabolic biomarkers. This work highlights its promise for use in advanced electrochemical sensing platforms.
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