Facile hydrothermal preparation of titanium dioxide decorated reduced graphene oxide nanocomposite

Chang, Betty Yea Sze; Huang, N. M.; An’amt, M.N.; Marlinda, Ab Rahman; Yusoff, Norazriena; Muhamad, Muhamad Rasat; Harrison, I. R.; Lim, Hong Ngee; Chia, Chin Hua

doi:10.2147/ijn.s28189

Cited by 36 publications

(33 citation statements)

References 60 publications

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“…Therefore, no other TiO 2 phases were detected. Additionally, the absence of RGO peak at 25.2 ∘ in the RGO-TiO 2 composite was probably due to the relatively low diffraction intensity of RGO that was shielded by the (101) crystal peak of TiO 2 [30].…”

Section: Resultsmentioning

confidence: 99%

Improved Synthesis of Reduced Graphene Oxide-Titanium Dioxide Composite with Highly Exposed{001}Facets and Its Photoelectrochemical Response

Thien

Omar

Blya

et al. 2014

International Journal of Photoenergy

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Crystal facet engineering has attracted worldwide attention, particularly in facet manipulation of titanium dioxide (TiO2) surface properties. An improved synthesis by solvothermal route has been employed for the formation of TiO2with highly exposed001facets decorated on reduced graphene oxide (RGO) sheets. The RGO-TiO2composite could be produced with high yield by following a stringently methodical yet simple approach. Field emission scanning electron microscope and high resolution transmission electron microscope imaging reveal that the structure consists of TiO2nanoparticles covered with TiO2nanosheets of exposed001facets on a RGO sheet. The photocurrent response of the RGO-TiO2composite was discovered to outperform that of pure TiO2, as a ~10-fold increase in photocurrent density was observed for the RGO-TiO2electrodes. This may be attributed to rapid electron transport and the delayed recombination of electron-hole pairs due to improved ionic interaction between titanium and carbon.

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Section: Resultsmentioning

confidence: 99%

Improved Synthesis of Reduced Graphene Oxide-Titanium Dioxide Composite with Highly Exposed{001}Facets and Its Photoelectrochemical Response

Thien

Omar

Blya

et al. 2014

International Journal of Photoenergy

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“…The mass decrease from 150 to 300 °C was attributed to the loss of the oxygen-containing groups. The last mass loss step started around 500 °C and was assigned to the pyrolysis of the GO carbon skeleton [ 51 ]. For bare TiO 2 , the initial mass loss was attributed to the adsorbed water in the material.…”

Section: Resultsmentioning

confidence: 99%

Performance of rGO/TiO2 Photocatalytic Membranes for Hydrogen Production

et al. 2020

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Although there are promising environmental and energy characteristics for the photocatalytic production of hydrogen, two main drawbacks must be overcome before the large- scale deployment of the technology becomes a reality, (i) the low efficiency reported by state of the art photocatalysts and, (ii) the short life time and difficult recovery of the photocatalyst, issues that need research and development for new high performance catalysts. In this work 2% rGO/TiO2 composite photocatalysts were supported over Nafion membranes and the performance of the photocatalytic membrane was tested for hydrogen production from a 20% vol. methanol solution. Immobilization of the composite on Nafion membranes followed three different simple methods which preserve the photocatalyst structure: solvent-casting (SC), spraying (SP), and dip-coating (DP). The photocatalyst was included in the matrix membrane using the SC method, while it was located on the membrane surface in the SP and DP membranes showing less mass transfer limitations. The performance of the synthesized photocatalytic membranes for hydrogen production under UVA light irradiation was compared. Leaching of the catalytic membranes was tested by measuring the turbidity of the solution. With respect to catalyst leaching, both the SC and SP membranes provided very good results, the leaching being lower with the SC membrane. The best results in terms of initial hydrogen production rate (HPR) were obtained with the SP and DP membrane. The SP was selected as the most suitable method for photocatalytic hydrogen production due to the high HPR and the negligible photocatalyst leaching. Moreover, the stability of this membrane was studied for longer operation times. This work helps to improve the knowledge on the application of photocatalytic membranes for hydrogen production and contributes in facilitating the large-scale application of this process.

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“…Graphene oxide (GO) was synthesized by simplified Hummers method [13,16] using commercially procured pristine graphite powder (Superior Graphite. Co).…”

Section: Experimental Details 21 Synthesis Of Rgo-mos 2 and Rgo-mosmentioning

confidence: 99%

Nanoscale heterojunctions of rGO-MoS₂ composites for nitrogen dioxide sensing at room temperature

et al. 2020

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Chemiresistive sensors, employing binary and ternary hybrids of reduced graphene oxide (rGO), are developed to detect nitrogen dioxide (NO 2 ) gas at parts per billion level (ppb) at room temperature. The sensors based on hierarchical structures of molybdenum disulphide (MoS 2 ) sheets decorated rGO and further integration of it with silver nanoparticles (Ag NPs) exhibit improved sensing responses with lower detection limits than the unary counterpart (rGO). An increase of nearly 500% in sensing response is observed in the ternary hybrid device over rGO alone at a concentration of 1 ppm and a 1145% increase in response is observed at 104 ppm. The ternary hybrid device outperforms the binary and the unary counterparts in terms of sensitivity to NO 2 over a wide concentration range from 1 ppm to 104 ppm. Additionally, the ternary hybrid device is highly selective to NO 2 amongst other atmospheric pollutants like ammonia, sulphur dioxide and carbon monoxide. An experimental detection limit of 50 ppb is further achieved with this device which is lesser than the 53 ppb permissible limit declared by Environmental Protection Agency (EPA). A synergistic effect was achieved with the binary and the ternary hybrids with the electronic modulations at the nanoscale interfaces at the nanoheterojunctions playing a key role in selective and enhanced adsorption of NO 2 at room temperature.

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Facile hydrothermal preparation of titanium dioxide decorated reduced graphene oxide nanocomposite

Cited by 36 publications

References 60 publications

Improved Synthesis of Reduced Graphene Oxide-Titanium Dioxide Composite with Highly Exposed{001}Facets and Its Photoelectrochemical Response

Improved Synthesis of Reduced Graphene Oxide-Titanium Dioxide Composite with Highly Exposed{001}Facets and Its Photoelectrochemical Response

Performance of rGO/TiO2 Photocatalytic Membranes for Hydrogen Production

Nanoscale heterojunctions of rGO-MoS₂ composites for nitrogen dioxide sensing at room temperature

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Facile hydrothermal preparation of titanium dioxide decorated reduced graphene oxide nanocomposite

Cited by 36 publications

References 60 publications

Improved Synthesis of Reduced Graphene Oxide-Titanium Dioxide Composite with Highly Exposed{001}Facets and Its Photoelectrochemical Response

Improved Synthesis of Reduced Graphene Oxide-Titanium Dioxide Composite with Highly Exposed{001}Facets and Its Photoelectrochemical Response

Performance of rGO/TiO2 Photocatalytic Membranes for Hydrogen Production

Nanoscale heterojunctions of rGO-MoS2 composites for nitrogen dioxide sensing at room temperature

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Product

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Nanoscale heterojunctions of rGO-MoS₂ composites for nitrogen dioxide sensing at room temperature