Surface oxygen-containing defects of graphene nanosheets with tunable nonlinear optical absorption and refraction

Zhu, Baohua; Wang, Fangfang; Li, Peng; Wang, Chong; Gu, Yuzong

doi:10.1039/c8cp04940h

Cited by 26 publications

(14 citation statements)

References 44 publications

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“…Recently, Zhu et al studied the effect of synergy between CdS and graphene on nonlinear optical properties [19]. Zhu et al researched the nonlinear optical properties of oxygen-containing defects in CdS/graphene [20,21]. Yin et al invented a nonlinear optical imaging technique by nonlinear optical symmetry [22].…”

Section: Introductionmentioning

confidence: 99%

A Facile Method to Synthesize CdSe-Reduced Graphene Oxide Composite with Good Dispersion and High Nonlinear Optical Properties

Zhu

Zhang

et al. 2019

Nanomaterials

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CdSe-reduced graphene oxide (CdSe/RGO) composites were synthesized by a hydrothermal method. CdSe/RGO composites with different mass ratios were prepared. The structure and morphology of CdSe/RGO composites were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The synthesis of CdSe/RGO complexes was successfully demonstrated by Fourier infrared (FT-IR) and Raman spectra. CdSe nanoparticles in the CdSe/RGO composite were uniformly dispersed on the graphene surface. The study found that oxygen-containing functional groups such as hydroxyl (-OH) and carboxyl (-COOH) groups in graphene played a decisive role in the dispersion of CdSe. The third-order nonlinear optical properties of CdSe/RGO composites were measured by a single beam Z-scan technique. The experimental results showed that composites exhibited two-photon absorption and self-focusing nonlinear refraction properties. Additionally, the third-order nonlinear susceptibility of the composite material was obviously enhanced, which was mainly due to the good dispersion of CdSe nanoparticles on graphene.

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Section: Introductionmentioning

confidence: 99%

A Facile Method to Synthesize CdSe-Reduced Graphene Oxide Composite with Good Dispersion and High Nonlinear Optical Properties

Zhu

Zhang

et al. 2019

Nanomaterials

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“…Figure 6 shows the UV-Vis absorption peak position of the sample. The absorption peak of GO was at 228.96 nm, which might be mainly derived from the π-π* transition of C-C and C=C in sp 2 hybridization [ 30 ]. For ZrO 2 /RGO nanocomposites, with the increase of ZrO 2 concentration, the absorption peaks were located at 262.79 nm, 264.16 nm, 266.07 nm, and 275.15 nm, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…With the increase of ZrO 2 concentration, the nonlinear refraction firstly decreased and then increased, which indicated that the combination of ZrO 2 and RGO had a synergistic effect on the nonlinearity. The normalized CA/OA Z-scan experimental data were fitted by the following equation [ 30 ]:

where x = z/z 0 ,

was the on-axis phase shift at the focus, defined as

, k = 2

/λ was the wave vector, λ was the laser wavelength,

was the nonlinear refractive index coefficient in m 2 /W,

represented the difference between the normalized transmitted peaks and valleys of the open/closed Z-scan trace, S was the fluence of the aperture. Then, the nonlinear refraction index was calculated by

.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Third-Order Nonlinear Synergistic Effect of ZrO2/RGO Composites

Zhao

Wang

et al. 2021

Nanomaterials

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Tuning the third-order nonlinear properties of graphene by hybrid method is of great significance in nonlinear optics research. ZrO2/reduced graphene oxide (RGO) composites with different ZrO2 concentrations were prepared by a simple hydrothermal method. The morphology and structure show that ZrO2 nanoparticles were uniformly dispersed on the surface of graphene nanosheets. The nonlinear optical (NLO) characteristics of composites with different ZrO2 concentrations were studied by the Z-scan technique of 532 nm picosecond pulsed laser. The results showed that ZrO2/RGO composites had saturated absorption and positive nonlinear refraction characteristics. Meanwhile, the third-order nonlinear susceptibility of the ZrO2/RGO composite with a 4:1 mass ratio of ZrO2 to graphene oxide could reach 23.23 × 10−12 esu, which increased tenfold compared to RGO, and the nonlinear modulation depth reached 11.22%. Therefore, the NLO characteristics could be effectively adjusted by controlling the concentration of ZrO2, which lays a foundation for further research on the application of ZrO2/RGO composites in NLO devices.

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“…The peaks located at 1251 and 956 cm −1 are ascribed to the stretching vibrations of the epoxy groups (C‒O‒C) [33,34,35]. The peaks at 1147 and 1070 cm −1 are attributed to C‒O vibrational mode for alkoxy groups [36,37,38]. The small peak at 1766 cm −1 corresponds to the C=O stretching vibration mode [39].…”

Section: Resultsmentioning

confidence: 99%

Voltammetric Detection of Caffeine in Beverages at Nafion/Graphite Nanoplatelets Layer-by-Layer Films

et al. 2019

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We report for the first time a procedure in which Nafion/Graphite nanoplatelets (GNPs) thin films are fabricated using a modified layer-by-layer (LbL) method. The method consists of dipping a substrate (quartz and/or glassy carbon electrodes) into a composite solution made of Nafion and GNPs dissolved together in ethanol, followed by washing steps in water. This procedure allowed the fabrication of multilayer films of (Nafion/GNPs)n by means of hydrogen bonding and hydrophobic‒hydrophobic interactions between Nafion, GNPs, and the corresponding solid substrate. The average thickness of each layer evaluated using profilometer corresponds to ca. 50 nm. The as-prepared Nafion/GNPs LbL films were characterized using various spectroscopic techniques such as X-ray photoelectron spectroscopy (XPS), energy-dispersive X-ray spectroscopy (EDS), FTIR, and optical microscopy. This characterization highlights the presence of oxygen functionalities that support a mechanism of self-assembly via hydrogen bonding interactions, along with hydrophobic interactions between the carbon groups of GNPs and the Teflon-like (carbon‒fluorine backbone) of Nafion. We showed that Nafion/GNPs LbL films can be deposited onto glassy carbon electrodes and utilized for the voltammetric detection of caffeine in beverages. The results showed that Nafion/GNPs LbL films can achieve a limit of detection for caffeine (LoD) of 0.032 μM and linear range between 20‒250 μM using differential pulse voltammetry, whereas, using cyclic voltammetry LoD and linear range were found to be 24 μM and 50‒5000 μM, respectively. Voltammetric detection of caffeine in beverages showed good agreement between the values found experimentally and those reported by the beverage producers. The values found are also in agreement with those obtained using a standard spectrophotometric method. The proposed method is appealing because it allows the fabrication of Nafion/GNPs thin films in a simple fashion using a single-step procedure, rather than using composite solutions with opposite electrostatic charge, and also allows the detection of caffeine in beverages without any pre-treatment or dilution of the real samples. The proposed method is characterized by a fast response time without apparent interference, and the results were competitive with those obtained with other materials reported in the literature.

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Surface oxygen-containing defects of graphene nanosheets with tunable nonlinear optical absorption and refraction

Abstract: Nonlinear optical response of graphene is weakened whether surface oxygen-containing content is too large or too small.

Cited by 26 publications

References 44 publications

A Facile Method to Synthesize CdSe-Reduced Graphene Oxide Composite with Good Dispersion and High Nonlinear Optical Properties

A Facile Method to Synthesize CdSe-Reduced Graphene Oxide Composite with Good Dispersion and High Nonlinear Optical Properties

Synthesis and Third-Order Nonlinear Synergistic Effect of ZrO2/RGO Composites

Voltammetric Detection of Caffeine in Beverages at Nafion/Graphite Nanoplatelets Layer-by-Layer Films

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