Direct synthesis of metal oxide incorporated mesoporous SBA-15, and their applications in non-enzymatic sensing of glucose

• Published in: Journal of colloid and interface science 2012-09, Vol.381 (1), p.143-151
• Main Authors: Anu Prathap, M.U., Kaur, Balwinder, Srivastava, Rajendra
• Format: Article
• Language: English
• Subjects: ascorbic acid; Catalysis; catalytic activity; Chemistry; cobalt; Colloidal state and disperse state; cupric oxide; detection limit; dopamine; Electrochemistry; Electrochemistry - methods; Electrodes; Exact sciences and technology; General and physical chemistry; glucose; Glucose - analysis; Glucose sensor; iron; Kinetics and mechanism of reactions; Limit of Detection; manganese; Mesoporous material; Metal oxide incorporated SBA-15 materials; Metals, Heavy - chemistry; Microscopy, Electron, Scanning; nickel; nitrogen; Non-enzymatic detection; One-step synthesis; oxidation; Oxidation-Reduction; Oxides; Porous materials; scanning electron microscopy; Scattering, Small Angle; Silicon Dioxide - chemistry; sorption; Spectroscopy, Fourier Transform Infrared; Surface physical chemistry; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; transmission electron microscopy; ultraviolet-visible spectroscopy; uric acid; X-Ray Diffraction
• ISSN: 0021-9797; 1095-7103
• DOI: 10.1016/j.jcis.2012.05.025

[Display omitted] ► Direct synthesis route was developed for metal oxide incorporated SBA-15 (M-SBA-15). ► M-SBA-15 based electrodes were used for the non-enzymatic glucose sensing. ► Cu-SBA-15 exhibited higher electrocatalytic activity than conventional CuO. One-step direct synthetic route is reported for the preparation of M-SBA-15 materials (M=Cu, Ni, Co, Fe, and Mn) with nSi/nM ratios ranging from 100 to 10 under mild acidic condition than conventionally employed for the synthesis of Si-SBA-15. Materials were characterized by a complementary combination of X-ray diffraction, nitrogen sorption, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared, and UV–visible spectroscopy. Experimental evidences show that metal oxides are incorporated in the pore wall of SBA-15 matrices. A non-enzymatic electrochemical sensor device was fabricated for glucose detection based on M-SBA-15 materials. Cyclic voltammetry and linear sweep voltammetry were used to evaluate the catalytic activity of the M-SBA-15 modified electrode toward glucose. It was found that the Cu-SBA-15 (Si/Cu=20) modified electrode showed enhanced electrocatalytic activity toward the oxidation of glucose in alkaline solution compared to that of the conventional CuO and other M-SBA-15 materials investigated in this study. Under the optimal detection conditions, the Cu-SBA-15 (Si/Cu=20) exhibited linear behavior in the concentration range from 10μM to 20mM for the quantification of glucose with a limit of detection of 10μM. Moreover, the Cu-SBA-15 modified electrode was also relatively insensitive to commonly interfering species such as ascorbic acid, uric acid, and dopamine.