Rapid and facile synthesis of graphene oxide quantum dots with good linear and nonlinear optical properties

Abstract

We herein report a rapid and effective method for the synthesis of graphene oxide quantum dots (GOQDs) with excellent linear and nonlinear optical properties. The GOQDs were prepared by chemical cutting of graphite oxide and characterized using Fourier transform infrared spectroscopy, X-ray diffraction, UV-Vis absorption spectroscopy, Raman spectroscopy and transmission electron microscopy. The Commission International de l'É clairage 1931 chromaticity coordinates for GOQDs (x = 0.21, y = 0.23) demonstrated that highly pure blue-light emission was achieved upon 330 nm excitation wavelength. Optical nonlinearity measurements conducted at 532 nm using 5 ns laser pulses indicated saturable absorption behavior, which tends to the onset of reverse saturable absorption as the input light fluence was increased.

Emission features, surface morphology and optical limiting properties of semiconducting Toluidine Blue O dye-poly(vinyl alcohol) nanocomposite architecture

“…properties of the nanocomposite films, in particular, improved the photo-stability and resistance against environmental degradation, compared to its constituent materials [13,14]. Similar TEM pattern was reported for other material and polymer nanocomposite films [1,32]. Figure 4 illustrates the linear absorption spectra of TBO-PVA nanocomposite films for different concentrations of TBO dye content along with that of unfilled PVA film and TBO dye in aqueous solution.…”

Diethylenetriamine-Doped Graphene Oxide Quantum Dots with Tunable Photoluminescence for Optoelectronic Applications

“…Because of the popularity of graphene in potential applications, similar graphene-based materials have followed the trend in fundamental and industrial research. Graphene quantum dots (GQDs)a new graphene derivativehave been discovered and are catching the attention of various researchers due to their peculiar properties such as edge effects and quantum confinement. − GQDs emit luminescence ranging from the blue to the red spectral region; the range can be controlled by their size, shape, oxygen-related functional groups, and redox potential. − Recently, a high fluorescence quantum yield (QY) has already been achieved and reported in GQDs synthesized by pulsed laser ablation, the microwave sequential bottom-up route, or low-temperature pyrolysis. − …”

“…GO has been attracting significant academic research focus owing to its peculiar physical and/or chemical properties and promising practical applications. − Graphene oxide quantum dots (GOQDs) are minute pieces of GO that emit steady-state blue or yellowish-green luminescence. ,, It is challenging to distinguish GQDs and GOQDs since both of them contain sp 2 carbon domains with oxygen-related functional groups; however, it has been reported that GOQDs reveal better photoluminescence (PL) properties than GQDs because of the reduction in intrinsic luminescence and enhancement in defect luminescence . Moreover, GOQDs may be dissolved more readily in a hydrophilic or hydrophobic solution due to the carboxyl and carbonyl groups . GOQDs are thus a promising candidate for utilization in many applications such as photocatalysts in water splitting and as photosensitizers in photovoltaics …”

“…3 Moreover, GOQDs may be dissolved more readily in a hydrophilic or hydrophobic solution due to the carboxyl and carbonyl groups. 3 GOQDs are thus a promising candidate for utilization in many applications such as photocatalysts in water splitting and as photosensitizers in photovoltaics. 16 Tunable photoluminescence (PL) is important in the fabrication of graphene-based nanostructures since it involves applications in bioimaging, sensing, and optoelectronics.…”

Improving Zr0.5Hf0.5O2-based charge-trapped performance by graphene oxide quantum dots

“…The XRD curve of GOQDs displayed one strong peak at 11.5 ○ , which is attributed to (002) crystallographic plane of hexagonal graphite with an interlayer d-spacing of 7.69 Å. 11,12 Note that since Fig. 1(c) only plots from 5 ○ to 55 ○ , the peak of Si substrate that is located at around 70 ○ does not appear in the figure.…”