Highly exposed {001} facets of titanium dioxide modified with reduced graphene oxide for dopamine sensing

Abstract

Titanium dioxide (TiO2) with highly exposed {001} facets was synthesized through a facile solvo-thermal method and its surface was decorated by using reduced graphene oxide (rGO) sheets. The morphology and chemical composition of the prepared rGO/TiO2 {001} nanocomposite were examined by using suitable characterization techniques. The rGO/TiO2 {001} nanocomposite was used to modify glassy carbon electrode (GCE), which showed higher electrocatalytic activity towards the oxidation of dopamine (DA) and ascorbic acid (AA), when compared to unmodified GCE. The differential pulse voltammetric studies revealed good sensitivity and selectivity nature of the rGO/TiO2 {001} nanocomposite modified GCE for the detection of DA in the presence of AA. The modified GCE exhibited a low electrochemical detection limit of 6 μM over the linear range of 2–60 μM. Overall, this work provides a simple platform for the development of GCE modified with rGO/TiO2 {001} nanocomposite with highly exposed {001} facets for potential electrochemical sensing applications.

Room-temperature embedment of anatase titania nanoparticles into porous cellulose aerogels

“…The peak located at 284.8 eV was ascribed to carbon atoms in C-C, C=C, and C-H bonds. The peak at 286.4 eV was assigned to the C-O bond, and the peak at 287.8 eV was attributed to the C=O bond [36]. Therefore, the XPS results further confirmed the formation of TiO 2 via the aforementioned preparation approach.…”

Dual-functional photocatalysis using a ternary hybrid of TiO2 modified with graphene oxide along with Pt and fluoride for H2-producing water treatment

“…Although the D band position in Pt/GO/TiO 2 remains unchanged, the G band of Pt/GO/TiO 2 was downshifted (from around 1600 to 1587 cm À1 ) compared with that of GO/TiO 2 , owing to the partial reduction of GO during the photocatalytic deposition of Pt. Partially reduced GO restores the hexagonal network of carbon atoms with defects [42]. The Raman analysis supports the TEM result that TiO 2 nanoparticles are hybridized with exfoliated graphene oxides.…”

Efficient gaseous toluene photoconversion on graphene–titanium dioxide nanocomposites with dominate exposed {0 0 1} facets

“…Many works put the emphasis on increasing the proportion of exposed {0 0 1} facets to achieve better photocatalytic performance in applications until Nitish Roy demonstrated that the presence of both the high-energy {0 0 1} oxidative and low-energy {1 0 1} reductive facets in an optimum proportion is necessary to reduce the charge recombination and thereby enhance the photocatalytic activity [22,23]. Therefore, the positive synergies effect of Gn and high reactive {0 0 1} facets are expected to be very effective in enhancing the photocatalytic efficiency of TiO 2 nanocrystals (NCs) [9][10][11][12][13]. Baojiang et al [9] had synthesized graphene/TiO 2 with exposed {0 0 1} facets and explained the electron transfer mechanisms of the enhanced photocatalytic activity.…”

“…Graphene (Gn), a 2 D carbonaceous material, has attracted much attention recently for its high thermal conductivity (5000 W m À1 K À1 ), excellent mobility of charge carriers (200,000 cm 2 V À1 s À1 ), large specific surface area (2630 m 2 g À1 ) and good mechanical stability [7,[9][10][11][12]. The combination of TiO 2 and Gn is effective in increasing the charge carrier mobility, improving the adsorptivity of pollutant molecules and extending the absorption range of light [13][14][15][16][17]25].…”