Preparation and characterization of silylated graphite oxide

Matsuo, Yoshiaki; Tabata, Takeshi; Fukunaga, Takahiro; Fukutsuka, Tomokazu; Sugie, Yosohiro

doi:10.1016/j.carbon.2005.06.006

Cited by 105 publications

(43 citation statements)

References 21 publications

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“…Recently, graphite oxide (GO), also called graphitic acid, attracts the attention of many researcher groups owing to its promising applications as an adsorbent, 1, 2 a component in composite materials with photochemical, conductive, electric or adsorptive properties, [3][4][5][6] or a precursor in the formation of graphene layers. [7][8][9] As an adsorbent, GO has been tested in the retention of NO, NO 2 and NH 3 .…”

Section: Introductionmentioning

confidence: 99%

Revisiting the chemistry of graphite oxides and its effect on ammonia adsorption

2009

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Graphical content entryThe mechanism of ammonia adsorption on graphite oxide (GO) is strongly related to the GO preparation and chemical features, especially to the sulfur-containing groups present on its surface. SummaryGraphite oxide (GO) was synthesized using two different methods: one with sulfuric acid as part of the oxidizing mixture (Hummers-Offeman method), and another one without the sulfurcontaining compound involved in the oxidation process (Brodie method). They were both tested for ammonia adsorption in dynamic conditions, at ambient temperature, and characterized before 2 and after exposure to ammonia by X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, potentiometric titration, energy-dispersive X-ray (EDX) spectroscopy, X-ray photoelectron spectroscopy (XPS) and elemental analysis. Analyses of the initial materials showed that besides epoxy, hydroxyl and carboxylic groups, a significant amount of sulfur is incorporated as sulfonic group for GO prepared by the Hummers-Offeman method. The process of ammonia adsorption seems to be strongly related to the type of GO. For GO prepared by the Brodie method, ammonia is mainly retained via intercalation in the interlayer space of GO and by reaction with the carboxylic groups present at the edges of the graphene layers. On the contrary, when GO prepared by the Hummers method is used, ways of retention are different: not only does the intercalation of ammonia is observed but also its reaction with the epoxy, carboxylic and sulfonic groups present. In particular, during the ammonia adsorption process, sulfonic groups are converted to sulfates in presence of superoxide anions O 2 -* . These sulfates can then react with ammonia to form ammonium sulfates. For both GOs, an incorporation of a significant part of the ammonia adsorbed as amines in their structure is observed as a result of reactive adsorption.

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Section: Introductionmentioning

confidence: 99%

Revisiting the chemistry of graphite oxides and its effect on ammonia adsorption

2009

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“…The composition of the resulting GO www.frontiersin.org was C 8 H 3.0 O 4.5 . GO was silylated as follows (Matsuo et al, 2004(Matsuo et al, , 2005. GO (100 mg) was mixed with n-butylamine [C 4 H 9 NH 2 , hereafter abbreviated as C 4 , 2 ml; 32 mol/GO unit (C 8 H 3.0 O 4.5 )] as an exfoliating reagent in a sealed glass vial under an Argon atmosphere and the resulting solution was sonicated for 15 min (VELVO-CLEAR, VS-150; 50 kHz, 150 W), then heated at 60°C for 1 h. Dry toluene (5 ml, water content <30 ppm) was added to this solution and the solution was again sonicated.…”

Section: Methodsmentioning

confidence: 99%

“…The obtained silylated GO samples were then silylated with C 1 Si in the same manner as described above for 1 day for 1-4 times. The composition of silylated GO was determined from the weight of residual SiO 2 after thermogravimetric analysis, assuming that 0.4 n-butylamine molecules per GO were included (Matsuo et al, 2005). The resulting silylating GO was heated at 500°C under dynamic vacuum.…”

Section: Methodsmentioning

confidence: 99%

Porous Properties of Pillared Carbons Prepared from the Thermal Reduction of Graphite Oxide Repeatedly Silylated with Methyltrichlorosilanes

2015

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Pillared carbons with interlayer spacings of 1.27-1.37 nm were obtained from graphite oxide repeatedly silylated with methyltrichlorosilane, when the content of it was higher than 1.5/GO unit. The BET surface area of the resulting pillared carbons reached 723 m 2 /g and decreased with the increase in the content of Si because of the increase in the density of pillar. Based on the intercalation behaviors of n-alkylamine molecules into pillared carbons, it has been concluded that the entrance for organic molecules between pillars and length of pillars were almost independent of the pillar density. The molecular length of n-butylamine molecule added during the silylation of graphite oxide seems to determine the length of the pillars.

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“…[15] This oxidation procedure was repeated for five times, and the composition was 55.58% carbon, 2.66% hydrogen and 41.76% oxygen, based on the elemental analysis of hydrogen and carbon. The obtained GO was silylated by MPTS in a similar manner as reported by Matsuo et al [16] GO (100 mg) and butylamine (1 ml) were mixed in a sealed glass vial in the presence of dry toluene (10 ml). The mixture was sonicated and then heated at 60 • C under nitrogen.…”

Section: Methodsmentioning

confidence: 99%

Surface‐enhanced Raman scattering of silylated graphite oxide sheets sandwiched between colloidal silver nanoparticles and silver piece

Fu¹,

Bei²,

Wang³

et al. 2009

J Raman Spectroscopy

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Graphite oxide (GO) was successfully silylated by 3-mercaptopropyltrimethoxysilane. The surface-enhanced Raman scattering spectrum of the silylated GO sheets sandwiched between colloidal silver nanoparticles and silver piece is presented. The Raman signal shows a 10 4 enhancement compared to that of bulk GO. The large Raman enhancement is most likely a result of electromagnetic (EM) coupling between the colloidal silver nanoparticles (localized surface plasmon) and the silver piece (surface plasmon polariton), creating large localized EM fields at their interface, where the silylated GO sheets reside in this sandwich architecture.

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Preparation and characterization of silylated graphite oxide

Cited by 105 publications

References 21 publications

Revisiting the chemistry of graphite oxides and its effect on ammonia adsorption

Revisiting the chemistry of graphite oxides and its effect on ammonia adsorption

Porous Properties of Pillared Carbons Prepared from the Thermal Reduction of Graphite Oxide Repeatedly Silylated with Methyltrichlorosilanes

Surface‐enhanced Raman scattering of silylated graphite oxide sheets sandwiched between colloidal silver nanoparticles and silver piece

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