Khan Maaz - Academia.edu (original) (raw)
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Papers by Khan Maaz
Materials Chemistry and Physics, 2019
Tungsten oxide (WO 3) nanostructures of controlled morphology were successfully synthesized by hy... more Tungsten oxide (WO 3) nanostructures of controlled morphology were successfully synthesized by hydrothermal method. The size, shape and crystal structure were tuned by varying amount of precursor and structure directing agent. TEM and XRD measurements confirm the formation of hexagonal and monoclinic nanostructures. The synthesized WO 3 nanostructures exhibit excellent photocatalytic and sensing properties. The photocatalysis was performed at room temperature by varying three different organic dyes i.e. Methyl Blue (MB), Methyl Orange (MO) and Rhodamine B (RhB) under UV irradiation. The photocatalytic efficiencies were optimized considering the effects of catalyst amount, dye concentration, calcination temperature and pH. Moreover, the WO 3 nanostructures reveal excellent electrocatalytic properties for sensing of H 2 O 2 and L-Cysteine. The WO 3 /GCE modified electrode shows highly reproducible sensitivity of 4.99 µA µM-1 cm-2 and 0.301 µA µM-1 cm-2 for H 2 O 2 and L-Cysteine, respectively. Moreover, the modified electrode exhibits a low detection limit of about 0.5 µM and wide linear detection range from about 0.5 to 50µM for H 2 O 2 and a low detection limit of about 3 µM and wide linear detection range from about 3 to 50µM for L-cysteine, respectively. Our results demonstrate that WO 3 nanostructures with multifunctional properties can be employed for remediation of environmental issues and sensing applications.
Materials Chemistry and Physics, 2019
Tungsten oxide (WO 3) nanostructures of controlled morphology were successfully synthesized by hy... more Tungsten oxide (WO 3) nanostructures of controlled morphology were successfully synthesized by hydrothermal method. The size, shape and crystal structure were tuned by varying amount of precursor and structure directing agent. TEM and XRD measurements confirm the formation of hexagonal and monoclinic nanostructures. The synthesized WO 3 nanostructures exhibit excellent photocatalytic and sensing properties. The photocatalysis was performed at room temperature by varying three different organic dyes i.e. Methyl Blue (MB), Methyl Orange (MO) and Rhodamine B (RhB) under UV irradiation. The photocatalytic efficiencies were optimized considering the effects of catalyst amount, dye concentration, calcination temperature and pH. Moreover, the WO 3 nanostructures reveal excellent electrocatalytic properties for sensing of H 2 O 2 and L-Cysteine. The WO 3 /GCE modified electrode shows highly reproducible sensitivity of 4.99 µA µM-1 cm-2 and 0.301 µA µM-1 cm-2 for H 2 O 2 and L-Cysteine, respectively. Moreover, the modified electrode exhibits a low detection limit of about 0.5 µM and wide linear detection range from about 0.5 to 50µM for H 2 O 2 and a low detection limit of about 3 µM and wide linear detection range from about 3 to 50µM for L-cysteine, respectively. Our results demonstrate that WO 3 nanostructures with multifunctional properties can be employed for remediation of environmental issues and sensing applications.