Preparation of nitrogen and sulphur Co-doped reduced graphene oxide (rGO-NS) using N and S heteroatom of thiourea

Rochman, Refada Adyansya; Wahyuningsih, Sayekti; Ramelan, Ari Handono; Hanif, Qonita Awliya

doi:10.1088/1757-899x/509/1/012119

Cited by 95 publications

(53 citation statements)

References 25 publications

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“…From the TiO 2 spectrum, several peaks at 467 cm −1 , 1345 cm −1 , 1629 cm −1 , and 3396 cm −1 can be observed. To the best of our understanding, the broad peak in the range of 500–1000 cm −1 region is ascribed to the Ti-O and Ti-O-Ti bridging stretching modes while the peak is denoted as anatase titania [ 39 ]. In the rGO-TiO 2 samples, most of the rGO peaks did not appear in nanocomposite samples except 80 °C and 200 °C in the range between 1600–1750 cm −1 , which indicated high C=C content.…”

Section: Resultsmentioning

confidence: 99%

Influence of Sputtering Temperature of TiO2 Deposited onto Reduced Graphene Oxide Nanosheet as Efficient Photoanodes in Dye-Sensitized Solar Cells

et al. 2020

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Renewable solar energy is the key target to reduce fossil fuel consumption, minimize global warming issues, and indirectly minimizes erratic weather patterns. Herein, the authors synthesized an ultrathin reduced graphene oxide (rGO) nanosheet with ~47 nm via an improved Hummer’s method. The TiO2 was deposited by RF sputtering onto an rGO nanosheet with a variation of temperature to enhance the photogenerated electron or charge carrier mobility transport for the photoanode component. The morphology, topologies, element composition, crystallinity as well as dye-sensitized solar cells’ (DSSCs) performance were determined accordingly. Based on the results, FTIR spectra revealed presence of Ti-O-C bonds in every rGO-TiO2 nanocomposite samples at 800 cm–1. Besides, XRD revealed that a broad peak of anatase TiO2 was detected at ~25.4° after incorporation with the rGO. Furthermore, it was discovered that sputtering temperature of 120 °C created a desired power conversion energy (PCE) of 7.27% based on the J-V plot. Further increase of the sputtering temperature to 160 °C and 200 °C led to excessive TiO2 growth on the rGO nanosheet, thus resulting in undesirable charge recombination formed at the photoanode in the DSSC device.

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Section: Resultsmentioning

confidence: 99%

Influence of Sputtering Temperature of TiO2 Deposited onto Reduced Graphene Oxide Nanosheet as Efficient Photoanodes in Dye-Sensitized Solar Cells

et al. 2020

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“…The slanted line corresponds to the diffusion resistance of lithium ions within the electrode active material. The diffusion resistance is correspondingly expressed as Warburg impedance (ZW) [24,47,49]. As shown in the figure 8(d), the RCT of Si@N-doped rGO/CNF composite material is only 195.0 Ω, which is much lower than Si@Ndoped rGO composite material (295.6 Ω) and Si/rGO/CNF composite material (683.5 Ω).…”

Section: Electrochemical Performancementioning

confidence: 99%

“…For the FTIR spectrum of GO (Figure 6b), the absorption peaks at 1715 and 1078 cm −1 are attributed to the stretching vibration of the -C=O bond in -COOH and the -C-O bond in -C-OH, respectively. By comparing the spectra of GO with the other two samples, it can be observed that the relative intensity of the absorption peak at 1715 cm −1 in Si@APTES/N-doped GO and Si@APTES/N-doped GO/CNF samples is significantly improved, and the peak at 1645 cm −1 disappeared, which was attributed to the stretching vibration of the -C=O bond and -C=N bond of the amide [45][46][47][48]. Based on the above analysis, we can conclude that a chemical cross-linking reaction with strong hydrogen bond interaction occurred between Si @ APTES and GO.…”

Section: Structure and Morphologymentioning

confidence: 99%

Synthesis and Electrochemical Performance of Electrostatic Self-Assembled Nano-Silicon@N-Doped Reduced Graphene Oxide/Carbon Nanofibers Composite as Anode Material for Lithium-Ion Batteries

Cong¹,

Park²,

Jo³

et al. 2021

Preprint

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We report a self-assembly synthesis of silicon nanoparticles/nitrogen-doped reduced graphene oxide/ carbon nanofiber (Si@N-doped rGO/CNF) composites as potential high-performance anodes for rechargeable lithium-ion batteries (LIB) through the electrostatic attraction between amino and carboxyl groups. Nitrogen atoms generate a large number of vacancies or defects on the graphite plane, providing additional transmission channels for the diffusion of lithium ions, and improving the conductivity of the electrode. Carbon nanofiber (CNF) can help maintain the stability of the electrode structure and prevent silicon nanoparticles from falling off the electrode, prevent silicon nanoparticles from being directly exposed to the electrolyte, and can form a stable solid electrolyte interface (SEI) film. The three-dimensional conductive structure composed of Si, nitrogen atom-doped reduced graphene oxide (N-doped rGO), and CNF can effectively buffer the volume changes of silicon nanoparticles, shorten the transmission distance of lithium ions (Li+) and electrons, and make the electrode have good conductivity and stability in mechanical properties. In addition, compared with the Si@N-doped rGO and Si/rGO/CNF composite electrode, the Si@N-doped rGO/CNF composite electrode shows good cycle performance and rate capability, and its reversible specific capacity can reach 1418.8 mAh/g. The capacity retention rate is 64.7%, and the coulomb efficiency is 95%.

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“…The intense bands at 1400 cm À1 may be attributed to NH 4 + vibration while the weaker band at 1165 cm À1 indicates the existence of C-N/C-S vibrations. 22 Fig. 6 The calibration curves for the biosensor modified with hemin for L-Asp (a) and D-Asp (b).…”

Section: Samplesmentioning

confidence: 99%

Stochastic biosensors based on N- and S-doped graphene for the enantioanalysis of aspartic acid in biological samples

et al. 2021

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Preparation of nitrogen and sulphur Co-doped reduced graphene oxide (rGO-NS) using N and S heteroatom of thiourea

Cited by 95 publications

References 25 publications

Influence of Sputtering Temperature of TiO2 Deposited onto Reduced Graphene Oxide Nanosheet as Efficient Photoanodes in Dye-Sensitized Solar Cells

Influence of Sputtering Temperature of TiO2 Deposited onto Reduced Graphene Oxide Nanosheet as Efficient Photoanodes in Dye-Sensitized Solar Cells

Synthesis and Electrochemical Performance of Electrostatic Self-Assembled Nano-Silicon@N-Doped Reduced Graphene Oxide/Carbon Nanofibers Composite as Anode Material for Lithium-Ion Batteries

Stochastic biosensors based on N- and S-doped graphene for the enantioanalysis of aspartic acid in biological samples

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