Study of nonlinear absorption properties of reduced graphene oxide by Z-scan technique
23 May 2017-Vol. 1832, Iss: 1, pp 140010
TL;DR: In this article, the structural and nonlinear absorption properties of reduced graphene oxide (rGO) synthesized by Modified Hummer's method were explored with the help of Fourier transform infrared spectroscopy (FTIR) and Raman spectrograms (Raman) using a continuous wave (CW) laser.
Abstract: Graphene has generated enormous research interest during the last decade due to its significant unique properties and wide applications in the field of optoelectronics and photonics This research studied the structural and nonlinear absorption properties of reduced graphene oxide (rGO) synthesized by Modified Hummer’s method Structural and physiochemical properties of the rGO were explored with the help of Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy (Raman) Nonlinear absorption property in rGO, was investigated by open aperture Z-scan technique by using a continuous wave (CW) laser The Z-scan results demonstrate saturable absorption property of rGO with a nonlinear absorption coefficient, β, of −262 × 10−4 cm/W, making it suitable for applications in Q switching, generation of ultra-fast high energy pulses in laser cavity and mode lockers
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TL;DR: In this paper, coal-based carbon nanoscrolls (CNS) were prepared through improved Hummers oxidation method using Xinjiang Wucaiwan coal as a carbon source, after removing impurities by acid treatment and graphitizing pretreatment.
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TL;DR: In this article , the authors investigated the nonlinear optical properties of defect enriched graphene oxide and reduced graphene oxide (rGO) by performing a single beam z-scan experiment using a continuous-wave (CW) laser at 532 nm.
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01 Mar 2023
TL;DR: In this paper , a double perovskite was synthesized via modified combustion route, and its structure was verified using XRD with Rietveld refinement with space group of P21/n.
Abstract: La2CoMnO6 double perovskite was synthesized via modified combustion route. XRD with Rietveld refinement confirms monoclinic structure with space group of P21/n. Irregular shaped porous morphology was determined from FE-SEM and elemental analysis was done using EDAX spectra. Existence of mixed valence state of Co and Mn were verified by XPS spectra and its bandgap was determined using Tauc plot. Vibrational analysis validates the formation of perovskite phase and degeneracy in Raman modes/thermal broadening provides signature vibrational bands corresponding to stretching and bending motions of MnO6 and CoO6. Supercapacitor performance using La2CoMnO6 as electrode material exhibits 84% of cyclic stability after 500 cycles. The material exhibits a combined saturable and reverse saturable absorption behaviour under open aperture and self-defocusing nature due to thermal effect under closed aperture measurements with Z-scan method, using continuous wave irradiation. These findings confirmed that La2CoMnO6 manganite can be used for energy storage and photonic applications.
5 citations
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TL;DR: Owing to its unusual electronic spectrum, graphene has led to the emergence of a new paradigm of 'relativistic' condensed-matter physics, where quantum relativistic phenomena can now be mimicked and tested in table-top experiments.
Abstract: Graphene is a rapidly rising star on the horizon of materials science and condensed-matter physics. This strictly two-dimensional material exhibits exceptionally high crystal and electronic quality, and, despite its short history, has already revealed a cornucopia of new physics and potential applications, which are briefly discussed here. Whereas one can be certain of the realness of applications only when commercial products appear, graphene no longer requires any further proof of its importance in terms of fundamental physics. Owing to its unusual electronic spectrum, graphene has led to the emergence of a new paradigm of 'relativistic' condensed-matter physics, where quantum relativistic phenomena, some of which are unobservable in high-energy physics, can now be mimicked and tested in table-top experiments. More generally, graphene represents a conceptually new class of materials that are only one atom thick, and, on this basis, offers new inroads into low-dimensional physics that has never ceased to surprise and continues to provide a fertile ground for applications.
35,293 citations
26,456 citations
TL;DR: In this paper, a model and theoretical understanding of the Raman spectra in disordered and amorphous carbon is given, and the nature of the G and D vibration modes in graphite is analyzed in terms of the resonant excitation of \ensuremath{\pi} states and the long-range polarizability of the long range bonding.
Abstract: The model and theoretical understanding of the Raman spectra in disordered and amorphous carbon are given. The nature of the G and D vibration modes in graphite is analyzed in terms of the resonant excitation of \ensuremath{\pi} states and the long-range polarizability of \ensuremath{\pi} bonding. Visible Raman data on disordered, amorphous, and diamondlike carbon are classified in a three-stage model to show the factors that control the position, intensity, and widths of the G and D peaks. It is shown that the visible Raman spectra depend formally on the configuration of the ${\mathrm{sp}}^{2}$ sites in ${\mathrm{sp}}^{2}$-bonded clusters. In cases where the ${\mathrm{sp}}^{2}$ clustering is controlled by the ${\mathrm{sp}}^{3}$ fraction, such as in as-deposited tetrahedral amorphous carbon (ta-C) or hydrogenated amorphous carbon (a-C:H) films, the visible Raman parameters can be used to derive the ${\mathrm{sp}}^{3}$ fraction.
12,593 citations
TL;DR: In this paper, a single-beam technique for measuring both the nonlinear refractive index and nonlinear absorption coefficient for a wide variety of materials is reported, including a comprehensive theoretical analysis.
Abstract: A sensitive single-beam technique for measuring both the nonlinear refractive index and nonlinear absorption coefficient for a wide variety of materials is reported. The authors describe the experimental details and present a comprehensive theoretical analysis including cases where nonlinear refraction is accompanied by nonlinear absorption. In these experiments, the transmittance of a sample is measured through a finite aperture in the far field as the sample is moved along the propagation path (z) of a focused Gaussian beam. The sign and magnitude of the nonlinear refraction are easily deduced from such a transmittance curve (Z-scan). Employing this technique, a sensitivity of better than lambda /300 wavefront distortion is achieved in n/sub 2/ measurements of BaF/sub 2/ using picosecond frequency-doubled Nd:YAG laser pulses. >
7,717 citations
TL;DR: Graphene and its derivatives are being studied in nearly every field of science and engineering as mentioned in this paper, and recent progress has shown that the graphene-based materials can have a profound impact on electronic and optoelectronic devices, chemical sensors, nanocomposites and energy storage.
3,118 citations