Microwave assisted facile synthesis of reduced graphene oxide-silver (RGO-Ag) nanocomposite and their application as active SERS substrate

Wadhwa, Heena; Kumar, Devender; Mahendia, Suman; Kumar, S.

doi:10.1016/j.matchemphys.2017.03.045

Cited by 46 publications

(6 citation statements)

References 68 publications

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“…This unique absorption pattern is attributed to the strong interaction between the irregular Ag NPs and incident light. [ 38 ] Besides, AFM image in Figure 5b indicates that the average topographic height of the prepared carbon nanostructure was 50 ± 0.5 nm, which is also confirmed by the cross‐section SEM image (Figure S2). And combining with the surface profile of SEM image (Figure 3b(ii)), it can be seen that Ag NPs (average size of 240 nm, Figure S3) were embedded within the nanopores, which is isolated by the carbon walls.…”

Section: Resultssupporting

confidence: 58%

Facile synthesis of noble metal decorated carbon nanostructure for SERS detection

Lai

Chen³

et al. 2021

J Raman Spectroscopy

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Surface enhanced Raman scattering (SERS) is a highly sensitive spectral analysis technique for ultra‐low trace molecule detection. Conventionally, noble metals like silver (Ag) and gold (Au) are used to prepare the SERS substrates; however, it usually requires careful experiment design and accurate process control, which defers their wide applications in practice. In this paper, a one‐step and low‐cost approach to prepare silver decorated porous carbon (Ag NPs/PCN) films for SERS application is reported. Experimentally, gelatin‐silver nitrate mixed solution was first spin‐coated on the Si substrates to form the thin films, and then, the substrates were carbonized at the different temperatures to obtain the Ag NPs/PCN films. The SERS performance of the Ag NPs/PCN films was evaluated by using the R6G as Raman reporter. Results reveal that the SERS activity is closely related to the spin‐coating rate and carbonization temperature. And detection limit of 10−8 M with the Raman enhancement factor of 1.64 × 106 (10−4‐M R6G) can be obtained on the most optimal substrate. Moreover, large‐scale mapping measurement further evidences that excellent Raman signal uniformity with the RSD of 6.93% also can be achieved.

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Section: Resultssupporting

confidence: 58%

Facile synthesis of noble metal decorated carbon nanostructure for SERS detection

Lai

Chen³

et al. 2021

J Raman Spectroscopy

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“…Smaller peak was detected at 796-650 cm −1 , which belong to Ag-halide stretching, proving the formation of rGO@Ag x% nanoparticles [32]. These results may be due to the interaction between the functional groups which containing oxygen in rGO NPs with Ag NPs [39].…”

Section: Characterizationmentioning

confidence: 79%

A facile method for synthesis rGO/Ag nanocomposite and its uses for enhancing photocatalytic degradation of Congo red dye

et al. 2022

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The enhancing breakdown of dyes using facile, novel and eco-friendly photocatalyst without remaining any hazards secondary intermediates from the dye species regarded one of the most challenges to the healthy world. A novel facile method was used to synthesize reduced graphene oxide (rGO) with various doping ratios of silver nanoparticles (Ag NPs) and applied as photocatalyst to enhancing removal of Congo red (CR) dye using UV light irradiation from aqueous solution. Some characterization features such as UV-diffuse reflectance spectra, TEM, SEM, FTIR, X-ray diffraction, and EDX were measured to demonstrate the energy gap, morphology, size distribution, crystalline nature, phase structure, and elemental compositions of as-synthesized nanoparticles. The effect of some important factors such as pH of solution, initial CR concertation (Co), amount of rGO@Ag (g) and contact time (t) were studied to detect the optimum adsorption condition. The results indicated that, the maximum CR dye photodegradation is obtained at pH 7, 120 min, 50 mg/L initial CR concentration and 0.4 g/L photocatalyst dosage. The photodegradation data declared that, the higher the Ag doping ratio, the higher the degrading efficiency. Isotherm and kinetic studies showed that Langmuir and Freundlich models and the pseudo-second-order model are well fitting the adsorption process with maximum CR adsorption values ranging between 86.95 and 98.04 mg/L with corresponding R2 > 0.99.

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“…Optical absorption performance of β‐Sn/RGO has been characterized along with two reference samples, inferring pure β‐Sn and pure RGO, and the results are shown in Figure . Clearly, for pure RGO, there is only one broad absorption peak at around 261 nm, which belongs to the π–π* transition of RGO . As for pure β‐Sn, an absorption peak at around 217 nm can be seen (to be clear, the position has been pointed out by an arrow in the inset of Figure ), which is due to the excitation of surface plasmons in the NPs, and the surface charge distribution of β‐Sn shown in Figure S2 (Supporting Information) indicates that the absorption can be assigned to the dipole resonance of β‐Sn.…”

Section: Resultsmentioning

confidence: 95%

“…On one hand, after contacting, hot electrons will transfer from β‐Sn NPs to RGO nanosheets because of the difference of work functions between β‐Sn (4.42 eV) and RGO (4.8 eV) . Such electron transition could promote charge transfer from R6G dye molecules to β‐Sn NPs, and eventually will intensify electron transfer to RGO, indicating the realization of chemical enhancement of SERS in β‐Sn/RGO . On the other hand, the existence of RGO could lead to stronger local electric field confinement, which will promote the enhancement of the Raman signals from R6G dye molecules as well…”

Section: Resultsmentioning

confidence: 99%

The Surface Plasmon Performance of β‐Sn/RGO Hybrid Nanostructure

Peng

et al. 2020

Adv Materials Inter

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A hybrid nanostructure composing of β‐Sn nanoparticles and reduced graphene oxide (RGO) nanosheets is successfully prepared through an effective and low‐cost solvothermal method. Both optical absorption measurements and finite element simulations confirm that the dominating plasmonic resonance frequency of such hybrid nanostructure is tunable in ultraviolet region and the near‐field enhancement effect can be achieved under broadband excitations ranging from ultraviolet to visible, which can be attributed to the coupling between β‐Sn and RGO. In addition, surface enhanced Raman scattering (SERS) determinations and corresponding calculations confirm that such all‐IV hybrid nanostructure can serve as an SERS platform and can be an alternative candidate for other plasmonic applications.

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Microwave assisted facile synthesis of reduced graphene oxide-silver (RGO-Ag) nanocomposite and their application as active SERS substrate

Cited by 46 publications

References 68 publications

Facile synthesis of noble metal decorated carbon nanostructure for SERS detection

Facile synthesis of noble metal decorated carbon nanostructure for SERS detection

A facile method for synthesis rGO/Ag nanocomposite and its uses for enhancing photocatalytic degradation of Congo red dye

The Surface Plasmon Performance of β‐Sn/RGO Hybrid Nanostructure

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