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Three-dimensional (3D) porous architecture enables the high exploration of graphene excellent properties, i.e. large surface area and superior conductivity. Additionally, heteroatoms doping can improve the electrocatalytic activity of graphene by creating abundant defective/active sites. To combine the prominent advantages of 3D porous structure and heteroatoms doping, we reported the facile synthesis of 3D phosphorus (P)-doped graphene (3D-PG) and evaluated its potential application in electrochemical H 2 O 2 sensing. As an efficient metal-free electrocatalyst, 3D-PG modified electrode exhibited exceptional sensing performances for sensitive, selective and stable detection of H 2 O 2 , which was ascribed to the synergistic effects of 3D porous structure and P-doping in significantly enhancing the eletrocatalytic activity for H 2 O 2 reduction reaction. More importantly, the 3D-PG based sensor could be used for real-time tracking H 2 O 2 released from living HeLa cells, hence making 3D-PG a potential high-performance electrocatalyst for practical electrochemical sensing. [ABSTRACT FROM AUTHOR]

• Investigation of the effect of ordered and disordered structure of silica on the gas sensing properties. • Investigation of the adsorption behavior of VOCs and small-molecule gas on the surface of silica with different structure. • Proposed different models to explain the gas adsorption behavior on the surface of silica with different structure. Ordered and disordered structure SiO 2 were fabricated on quartz crystal microbalance (QCM) chips by two different self-assembly methods. Due to the special hexagonal alignment, ordered structure SiO 2 exhibits good gas adsorption property to volatile organic compounds (VOCs) and small-molecule gases. Replacing model and Filling model were employed to explain the sensing mechanism of ordered structure SiO 2. Ordered structure SiO 2 can selectively detect VOCs due to the strong force provided by capillary condensation. While disordered structure SiO 2 exhibits higher adsorption capacity because of the abundant active sites exposed. Adsorption behavior and sensing mechanism of SiO 2 with different structure were discussed. [ABSTRACT FROM AUTHOR]