Defect Mediated W₁₈O₄₉ Nanorods Bundle for Nonenzymatic Amperometric Glucose Sensing Application

In this work, we have successfully proclaimed the importance of defect prone nanostructure on to the electrode surface for the promising glucose sensing applications. Oxygen-deficient W₁₈O₄₉ moieties with multiple valences W⁶⁺ and W⁵⁺ have been investigated as an efficient electrocatalyst for the nonenzymatic glucose sensing. In order to highlight the importance of the defect, WO₃ nanomaterial's electrode has also been synthesized and tested for glucose sensing. W₁₈O₄₉ delivers a larger Brunauer-Emmett-Teller (BET) surface area and mesoporous pores which have contributed to the high sensitivity performances. The oxygen vacant W₁₈O₄₉ nanostructure has been synthesized by a facile solvothermal route and has retained interconnected nanorods morphology. Compared with non-oxygen-deficient WO₃, this defect prone version of tungsten oxide (W₁₈O₄₉) possesses a doubled linearity range up to 1.6 mM maximum electrooxidation toward glucose by giving a 1.6 times higher sensitivity of 167 μA mM^-1 cm^-2, 0.5 times lower detection limit of 0.02 μM (S/N = 3), and a swift response time of 5 s.