Graphene oxide as a substrate for Raman enhancement

Liang, Weifang; Chen, Xiaoyun; Sa, Yu; Feng, Yuanming; Wang, Yan; Wang, Lin

doi:10.1007/s00339-012-7051-y

Cited by 16 publications

(17 citation statements)

References 42 publications

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“…Due to the powerful p-p interactions, hydrogen bonding, and electrostatic interactions, MA exhibits strong affinity for GO [29][30][31]. MA can be intercalated into the interlayer region of GO, and its surface characteristic is modified.…”

Section: Resultsmentioning

confidence: 99%

Enhanced flame retardancy of polypropylene by melamine-modified graphene oxide

Yuan

Huang

et al. 2015

J Mater Sci

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Graphene oxide (GO) is modified by melamine (MA) via the strong p-p interactions, hydrogen bonding, and electrostatic attraction. PP composites are prepared by melt compounding method, and GO/functionalized graphene oxide (FGO) is in situ thermally reduced during the processing. The results of scanning electron microscopy and transmission electron microscopy indicate that FGO nanosheets are homogeneously dispersed in polymer matrix with intercalation and exfoliation microstructure. The FGO/PP nanocomposite exhibits higher thermal stability and flame retardant property than those of the GO counterpart. During the thermal decomposition, the intercalated MA is condensed to graphitic carbon nitride (g-C 3 N 4 ) in the confined micro-zone created by GO nanosheets. This in situ formed g-C 3 N 4 provides a protective layer to graphene and enhances its barrier effect. The heat release rate and the escape of volatile degradation products are reduced in the FGO-based nanocomposites.

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Section: Resultsmentioning

confidence: 99%

Enhanced flame retardancy of polypropylene by melamine-modified graphene oxide

Yuan

Huang

et al. 2015

J Mater Sci

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“…29 Besides graphene, its other two derivatives, graphene oxide (GO) and rGO, have also been studied as promising substrates for SERS. A study used GO-based SERS substrate to acquire Raman spectra of rodamine, melamine, and cephalexin, 21 but the results showed a weak enhancement of SERS due to CM of graphene. 21 This same conclusion was also reached in another study by Yu et al 28 In our study, we observed that the main SERS enhancer still relied on the EM of noble metal nanostructures.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…A study used GO-based SERS substrate to acquire Raman spectra of rodamine, melamine, and cephalexin, 21 but the results showed a weak enhancement of SERS due to CM of graphene. 21 This same conclusion was also reached in another study by Yu et al 28 In our study, we observed that the main SERS enhancer still relied on the EM of noble metal nanostructures. This is consistent with another study 30 using fabricated Ag or AuNPsdecorated rGO on Si substrate as an efficient SERS substrate to detect aromatic molecules with a low detection limit at the nanomolar level.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Use of Graphene and Gold Nanorods as Substrates for the Detection of Pesticides by Surface Enhanced Raman Spectroscopy

Nguyen

Zhong

Mustapha

et al. 2014

J. Agric. Food Chem.

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This study aimed to use gold nanorods and graphene as key materials to fabricate high-performance substrates for the detection of pesticides by surface enhanced Raman spectroscopy (SERS). Three types of pesticides (azinphos-methyl, carbaryl, and phosmet) were selected. Gold nanorods have great potential to be used as a SERS substrate because it is easy to tune the surface plasmon resonance of the nanorods to the laser excitation wavelength of Raman spectroscopy. Graphene is a promising nanoscale material that can be used for supporting metal nanostructures. Three types of novel SERS substrates were fabricated, including graphene-gold film-gold nanorod (G-Au-AuNR) substrate, gold film-gold nanorod (Au-AuNR) substrate, and graphene coupled with gold nanorods (G-AuNR). The results demonstrate that G-Au-AuNR substrates exhibited the strongest Raman signals of the selected pesticides, followed by the Au-AuNR substrates. G-AuNR exhibited the weakest Raman signals, and no characteristic spectral features of the analytes were obtained. A partial least-squares method was used to develop quantitative models for the analysis of spectral data (R = 0.94, 0.87, and 0.86 for azinphos-methyl, carbaryl, and phosmet, respectively). The G-Au-AuNRs substrate was able to detect all three types of pesticides at the parts per million level with limits of detection at around 5, 5, and 9 ppm for azinphos-methyl, carbaryl, and phosmet, respectively. These results indicate that combining gold nanorods and graphene has great potential in the fabrication of sensitive, lightweight, and flexible substrates for SERS applications to improve food safety.

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“…Therefore, a Raman spectrum similar to graphene oxide is formed because the D and the G peaks signicantly overlap. 24 It has been demonstrated that measuring the D peak intensity helps quantitatively analyze the defect density of graphene. 25 The ratio of the intensity of the D-G peaks (I D /I G ) is oen used as an important parameter to characterize the defect density of graphene.…”

Section: Raman Spectroscopy Analysismentioning

confidence: 99%