Au/graphene hydrogel: synthesis, characterization and its use for catalytic reduction of 4-nitrophenol

Li, Jing; Liu, Chunyan; Yun, Liu

doi:10.1039/c2jm16386a

Cited by 833 publications

(464 citation statements)

References 38 publications

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“…A sharp peak at 2h = 26.6°was noted. Graphene oxide has a peak centered on 2h = 10.4°and graphene peak is centered around 2h = 24°-26° Wang et al 2009;Mondal et al 2012;Li et al 2012). This is attributed to the (002) crystal plane (Li et al 2012).…”

Section: Resultsmentioning

confidence: 99%

“…Graphene oxide has a peak centered on 2h = 10.4°and graphene peak is centered around 2h = 24°-26° Wang et al 2009;Mondal et al 2012;Li et al 2012). This is attributed to the (002) crystal plane (Li et al 2012). The absence of any peak around 10.4°in the present case shows that the material synthesized is predominantly graphene, and the reduction of GO was mostly complete.…”

Section: Resultsmentioning

confidence: 99%

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A study on corrosion resistant graphene films on low alloy steel

Pavan

Ramanan

2016

Appl Nanosci

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Graphene nanosheets were produced after synthesizing graphene oxide via Hummer's method and a modified Hummer's method. The obtained graphene after reduction was dispersed in 1-propanol to get a coating solution. Mild steel coupons were coated with the graphene solution via dip coating method. Corrosion studies were carried out at different environments like water (pH 6.0), HCl (0.1 N), NaCl (3.5 wt%) and NaOH (1 M). Tafel analysis showed a reduction in the corrosion rate up to 99 % after three layer deposition with the graphene developed using the modified Hummer's method. X-ray diffraction and Raman Spectroscopy confirmed the presence of graphene.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

A study on corrosion resistant graphene films on low alloy steel

Pavan

Ramanan

2016

Appl Nanosci

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“…In this experiment, an amperometric immunoassay for enolase (NSE) was identified as a label-free tumor marker neuron by binding to a hydrogel and resulted in a high detection limit ranging from 100 pg·mL -1 to 1 pg·mL -1 . Li et al synthesized a cylindrical Au/graphene hydrogel under hydrothermal conditions through the self-assembly of catalyst reduction of 4-nitrophenol (4-NP) that was about 90 times higher catalyst performance than the AuNP sponge type and exhibited 14 times the increased catalyst performance compared with an AuNP catalyst-based polymer [117] It promoted electron absorption by 4-NP molecules by the high adsorption power of graphene 4-NP and electron transfer of graphene to AuNPs.…”

Section: Hybrid Materialsmentioning

confidence: 99%

Incorporation of Conductive Materials into Hydrogels for Tissue Engineering Applications

Min¹,

Koh²

2018

Preprint

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In the field of tissue engineering, conductive hydrogels have been the most effective biomaterials to mimic the biological and electrical properties of tissues in the human body. The main advantages of conductive hydrogel include not only its physical properties, but also its adequate electrical properties, thus providing electrical signals to cells efficiently. However, when introducing a conductive material into a non-conductive hydrogel, a conflicting relationship between the electrical and mechanical properties may develop. This review examines the strengths and weaknesses of the generation of conductive hydrogels using various conductive materials and introduces the use of these conductive hydrogels in tissue engineering applications.

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“…39 4-AP was usually prepared by reduction of 4-NP with NaBH 4 in the presence of catalysts. 40,41 The catalytic reduction process can be represented as, It is interesting that the synthesized Ni 3 B and Ni 2 B powders are ferromagnetic as shown in Fig. 9a.…”

Section: Catalytic Performance Of the Crystalline Ni-b Alloy Powders-mentioning

confidence: 99%

Electrochemical Preparation of Fine Powders of Nickel-Boron Alloys in Molten Chlorides for Magnetic Hydrogenation Catalysts

Peng

Tan

et al. 2015

J. Electrochem. Soc.

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Fine powders of magnetic nickel-boron alloys were prepared for the first time by direct electrochemical reduction of the 2Ni 3 (BO 3 ) 2 /B 2 O 3 , Ni 3 (BO 3 ) 2 /NiO and Ni 3 (BO 3 ) 2 /3NiO composite precursors in molten CaCl 2 -NaCl at 700• C. Precursors with different nickel to boron atomic ratios (R Ni/B = 1, 2 or 3) were synthesized by the sol-gel process followed by thermal annealing at 750• C. The reduction pathway, phase transformation and morphology of the samples electrolyzed at different voltages and times were analyzed by XRD, SEM, and EDX. When the applied voltage reached to 3.0 V, pure Ni 3 B can be obtained from the oxide precursor with R Ni/B = 3. However, the oxide precursors with R Ni/B = 1 and 2 both resulted in mainly Ni 2 B. Metal borides with a boron covalent framework have interesting physical properties, such as high hardness, superconductivity, thermal stability, oxidation resistance, high melting points and outstanding permanent magnetism. They are widely used in various high-tech industries.1 Metal borides also possess high catalytic activity to the hydrogenation reactions and hydrogen production.2-4 Metal borides are prepared in three forms, namely, the bulk materials, the amorphous or crystalline powders. Each of them has its applied advantages. For example, nano-amorphous nickel borides have shown much higher activity and selectivity in the catalytic hydrogenation of organic substances such as benzene, p-chloronitrobenzene, and furfural. [5][6][7] The crystalline nickel borides can be used as diffusion barrier for Cu integrated circuit, 8 and also used as surface coating for the strengthening or corrosion prevention of the substrate. 9-10Although nickel borides can be easily prepared by the high temperature reaction between Ni and B, 11 it is quite difficult to convert the obtained bulk borides into fine powders. Nanometer Ni-B can be prepared by reaction between the borohydride and the nickel ions in a solution. For example, nano-amorphous Ni-B was synthesized in aqueous solutions, 12-13 and nano-crystalline Ni 3 B was prepared at 300• C in tetraethylene glycol. 14 Alternatively, the solvothermal method in benzene resulted in nano-crystalline Ni-B as well.15 However, these methods need expensive and toxic borohydrides serving both as the reducing agent and boron source.Since late 1990s, it has been reported that metal, alloy and intermetallic powders can be directly prepared by electrolysis of solid precursors of metal compounds (e.g. oxides or sulfides) and mixed metal compounds respectively in high temperature molten salts. [16][17][18][19][20][21][22][23][24] This method is also capable of processing and production of nanomaterials for various applications such as enhancing catalytic and photoresponsive performances 17,25-28. Metal borides could be also prepared by this process. However, the melting point of B 2 O 3 (450 • C) is much lower than the working temperatures (600• C ∼900 • C) of the commonly used molten chloride salts such as CaCl 2 and LiCl. Therefore, B 2 O 3 c...

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Au/graphene hydrogel: synthesis, characterization and its use for catalytic reduction of 4-nitrophenol

Cited by 833 publications

References 38 publications

A study on corrosion resistant graphene films on low alloy steel

A study on corrosion resistant graphene films on low alloy steel

Incorporation of Conductive Materials into Hydrogels for Tissue Engineering Applications

Electrochemical Preparation of Fine Powders of Nickel-Boron Alloys in Molten Chlorides for Magnetic Hydrogenation Catalysts

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