A simple method for the reduction of graphene oxide by sodium borohydride with CaCl2 as a catalyst

Yang, Zhenzhen; Zheng, Qingbin; Qiu, Hanxun; Li, Jing; Yang, Jing

doi:10.1016/s1872-5805(15)60174-3

Cited by 121 publications

(49 citation statements)

References 23 publications

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“…The synthesized GO possessed two different absorption peaks at 237 nm for π-π* transition mode of aromatic C–C bond and at 300 nm for n-π* transition mode of C=O bond, respectively [ 40 , 42 ]. Unlike the GO, such characteristic peaks were not observed for the Ag/GO composite in an absorption spectrum, possibly due to their chemical structure change during the synthesis process (e.g., GO to rGO) [ 43 ]. Nevertheless, the particle size was still relatively smaller, and the composite showed a better dispersion under our experimental conditions than those of the thermal-driven method ( Supplementary Figure S2 ).…”

Section: Resultsmentioning

confidence: 99%

“…It was anticipated that the relatively high dispersion characteristics of the prepared Ag/GO composites were contributed from the use of NaBH 4 . In other words, NaBH 4 tends to have excellent reducing power for –C=O groups, but relatively low for –COOH and –OH species [ 43 ]. To understand the tendency of the reducing behavior of NaBH 4 , the prepared NPs were examined via FT-IR ( Supplementary Figure S3 ).…”

Section: Resultsmentioning

confidence: 99%

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Polyacrylonitrile Nanofiber Membrane Modified with Ag/GO Composite for Water Purification System

et al. 2020

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Silver nanoparticle-modified graphene oxide (Ag/GO) was reliably prepared by using sodium borohydride (NaBH4) in the presence of citric acid capping agent via a simple wet chemistry method. This rapidly formed Ag/GO composite exhibited good dispersity in a solution containing hydrophilic polyacrylonitrile (PAN). Subsequent electrospinning of this precursor solution resulted in the successful formation of nanofibers without any notable defects. The Ag/GO-incorporated PAN nanofibers showed thinner fiber strands (544 ± 82 nm) compared to those of GO-PAN (688 ± 177 nm) and bare-PAN (656 ± 59 nm). Subsequent thermal treatment of nanofibers resulted in the preparation of thin membranes to possess the desired pore property and outstanding wettability. The Ag/GO-PAN nanofiber membrane also showed 30% higher water flux value (390 LMH) than that of bare-PAN (300 LMH) for possible microfiltration (MF) application. In addition, the resulting Ag/GO-PAN nanofiber membrane exhibited antibacterial activity against Escherichia coli (Gram-negative) and Staphylococcus aureus (Gram-positive). Furthermore, this composite membrane exhibited outstanding anti-fouling property compared to the GO-PAN nanofiber membrane in the wastewater treatment. Therefore, the simple modification strategy allows for the effective formation of Ag/GO composite as a filler that can be reliably incorporated into polymer nanofiber membranes to possess improved overall properties for wastewater treatment applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Polyacrylonitrile Nanofiber Membrane Modified with Ag/GO Composite for Water Purification System

et al. 2020

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“…The coated green samples were dried overnight at room temperature [29]. The GO coated on copper was then reduced chemically by dipping it in sodium borohydride (NaBH 4 ) solution as the reducing agent [41]. For the purpose of comparison, the GO that was prepared by modified Hummer's method was also chemically reduced by dispersing it in 50 mL of DI water along with 0.57 gm of sodium borohydride (NaBH 4 ) and 0.225 gm of calcium chloride (CaCl 2 ) as the catalyst for about 12 h at room temperature.…”

Section: Methodsmentioning

confidence: 99%

Graphene Coating on Copper by Electrophoretic Deposition for Corrosion Prevention

et al. 2017

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Abstract:In this paper, we report the use of a simple and inexpensive electrophoretic deposition (EPD) technique to develop thin, uniform, and transparent graphene oxide (GO) coating on copper (Cu) substrate on application of 10 V for 1 s from an aqueous suspension containing 0.03 wt % graphene oxide. GO was partially reduced during the EPD process itself. The GO coated on Cu was completely reduced chemically by using sodium borohydride (NaBH 4 ) solution. The coatings were characterized by field emission scanning electron microscope (FESEM), Raman spectroscopy, Fourier-transform infrared spectroscopy (FTIR), XRD, and UV/VIS spectrophotometry. Corrosion resistance of the coatings was evaluated by electrochemical measurements under accelerated corrosion condition in 3.5 wt % NaCl solution. The GO coated on Cu and chemically reduced by NaBH 4 showed more positive corrosion potential (E corr ) (−145.4 mV) compared to GO coated on Cu (−182.2 mV) and bare Cu (−235.3 mV), and much lower corrosion current (I corr ) (7.01 µA/cm 2 ) when compared to 15.375 µA/cm 2 for bare Cu indicating that reduced GO film on copper exhibit enhanced corrosion resistance. The corrosion inhibition efficiency of chemically reduced GO coated Cu was 54.40%, and its corrosion rate was 0.08 mm/year as compared to 0.18 mm/year for bare copper.

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“…Due to the hazardous effect of heavy metals (e.g., Cr, Hg, Pb, Cd) on environment and health, highly sensitive and selective heavy metal sensors have attracted a wide research interests . For example, graphene surface can be functionalized with a self‐assembled 1‐octadecanethiol monolayer for the detection of Hg 2+ at 10 ppm, the sensitivity of which can be attributed to the firm binding between the Hg 2+ and the thiol groups of the 1‐octadecanethiol.…”

Section: Applications Of Graphene Biochemical Sensorsmentioning

confidence: 99%

Ultrasensitive Field‐Effect Biosensors Enabled by the Unique Electronic Properties of Graphene

Zhang

Jing

Shen

et al. 2019

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This review provides a critical overview of current developments on nanoelectronic biochemical sensors based on graphene. Composed of a single layer of conjugated carbon atoms, graphene has outstanding high carrier mobility and low intrinsic electrical noise, but a chemically inert surface. Surface functionalization is therefore crucial to unravel graphene sensitivity and selectivity for the detection of targeted analytes. To achieve optimal performance of graphene transistors for biochemical sensing, the tuning of the graphene surface properties via surface functionalization and passivation is highlighted, as well as the tuning of its electrical operation by utilizing multifrequency ambipolar configuration and a high frequency measurement scheme to overcome the Debye screening to achieve low noise and highly sensitive detection. Potential applications and prospectives of ultrasensitive graphene electronic biochemical sensors ranging from environmental monitoring and food safety, healthcare and medical diagnosis, to life science research, are presented as well.

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A simple method for the reduction of graphene oxide by sodium borohydride with CaCl2 as a catalyst

Cited by 121 publications

References 23 publications

Polyacrylonitrile Nanofiber Membrane Modified with Ag/GO Composite for Water Purification System

Polyacrylonitrile Nanofiber Membrane Modified with Ag/GO Composite for Water Purification System

Graphene Coating on Copper by Electrophoretic Deposition for Corrosion Prevention

Ultrasensitive Field‐Effect Biosensors Enabled by the Unique Electronic Properties of Graphene

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