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Novel Green Synthesis of Graphene Layers using Zante Currants and Graphene Oxide
摘要： The present work shows a facile route for the preparation of graphene layers and for the first time Zante currants extract used for the effective deoxygenation of graphene oxide has been reported. Zante currants (ZC) extract reduce effectively GO into few layered structures of graphene (FLG). The morphology of few layers graphene and graphene oxide (GO) were investigated by SEM and TEM. Reduction effect on graphene oxide confirm by other technique like Raman, FTIR, XRD and UV spectrophotometry. This procedure keep away the use of hazardous chemicals, thus providing a new hope for large scale production of chemically reduced graphene.
关键词： Graphene oxide (GO),Few layers graphene (FLG),Zante currants (ZC),Green synthesis
更新于2025-09-23 15:23:52
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In-Situ covalent synthesis of gold nanorods on GO surface as ultrasensitive Raman probe
摘要： In this paper, using thiolated graphene oxide (GO‐O‐SH) as substrate, gold nanorods (AuNRs) covalently linked to the GO surface by in‐situ seed growth method were first reported. The as‐prepared composites were characterized by UV–vis spectrum, transmission electron microscopy (TEM), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT‐IR). Experimental results indicated that the introduction of short flexible organic chain between GO and AuNRs contributed to the homogenous synthesis of gold rods, and uniform gold nanorods with aspect ratio within 3~8 were covalently linked to the surface of GO with high stability and yield. The strategy represented an outstanding improvement in comparison to the traditional route for fabricating the two GO@AuNRs composites. Furthermore, based on coupling of nanomaterials, the composites could act as high sensitive Raman probe with limit of detection (LOD) reaching 1 × 10?12 M.
关键词： covalent synthesis,Raman probe,graphene oxide (GO),gold nanorods
更新于2025-09-23 15:23:52
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Silver Nanostructures on Graphene Oxide as the Substrate for Surface-Enhanced Raman Scattering (SERS)
摘要： Nanosized surface-enhanced Raman scattering (SERS) substrates fabricated by the controlled growth of metal nanostructures on water-dispersed two-dimensional nanomaterials can open a new avenue for SERS analysis of liquid samples in biological fields. In this work, regular and uniform Ag nanostructures were grown on the surface of graphene oxide (GO) through a microwave-assisted hydrothermal method. Polyamidoamine (PAMAM) dendrimers were assembled on the surface of GO to form GO/PAMAM templates for growing Ag nanostructures, which are primarily comprised of Ag dimers and trimers. The prepared Ag/GO nanocomposites are highly dispersed and stable in aqueous solution and may be used as substrates for enhanced Raman detection of rhodamine 6 G (R6G) in aqueous solution. This special substrate provides high-performance SERS and suppresses R6G fluorescence in aqueous solution and is promising as a nanosized material for the enhanced Raman detection of liquid samples in biological diagnostics.
关键词： graphene oxide (GO),Surface-enhanced Raman scattering (SERS),polyamidoamine (PAMAM) dendrimers,transmission electron microscopy (TEM),Fourier transform infrared (FTIR) spectroscopy,rhodamine 6G (R6G)
更新于2025-09-23 15:23:52
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Fiber temperature and humidity sensor based on photonic crystal fiber coated with graphene oxide
摘要： A temperature and humidity sensor based on photonic crystal fiber(PCF) coated with graphene oxide (GO) cascaded with two spherical structures is presented and demonstrated. The principle of this sensor is based on Mach–Zehnder interferometer (MZI), and the interference spectrum is sensitive to the change of temperature and humidity. Because of the hydrophilic property of GO, refractive index (RI) of the fiber surface changes significantly with the variation of humidity. Therefore, the GO film deposited on the PCF surface can improve the humidity sensitivity of the sensor. Experimental results show that the temperature sensitivities are 0.063 nm/?C and 0.086 nm/?C from 10?C to 70?C. The humidity sensitivities are 0.128 nm/%RH and 0.159 nm/%RH from 30% to 70%. Moreover, it also contains the following advantages: low cost, simple construction, and high sensitivity.
关键词： Photonic crystal fiber (PCF),Graphene Oxide (GO),Optical fiber sensor,Humidity,Temperature
更新于2025-09-23 15:21:01
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Immunosensor Based On Cladding-etched Excessively Tilted Fiber Grating Coated With Graphene Oxide
摘要： In this work, a bovine serum albumin (BSA) immunosensor based on graphene oxide (GO) modified cladding-etched excessively tilted fiber grating (ExTFG) is proposed, and the basic principle and sensing characteristics of the sensor are analyzed. Refractive index (RI) sensitivity of ExTFG is increased by 77.17% by etching to 80μm. The cladding-etched ExTFG is coated with GO, and then BSA anti-monoclonal antibody (anti-MABs) are immobilized on its surface, so as to realize the special detection for BSA. Experimental results show that the sensitivity is about five times of that of the un-etched GO-coated ExTFG, the limit of detection (LOD) is ~0.165 nM by using optical spectrum analyzer with a resolution of 0.03nm.
关键词： Graphene oxide (GO),Cladding etching,Excessively tilted fiber grating (ExTFG),Immunosensor
更新于2025-09-16 10:30:52
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Handbook of Graphene || Quantitative Real‐Time Evaluation of C/O Ratios and Stepwise Control of Deoxidization of Graphene Oxide Using Plasmonic‐Based Electrochemical Spectroscopy
摘要： Graphene oxide (GO) is composed of carbon and oxygen functional groups. It has been the subject of extensive research because these oxygen functional groups can be readily processed for various applications. A novel technique to deoxidize GO to reduced graphene oxide (rGO) sheets to enable the stepwise control of surface oxygen content and maximize the quality of carbon-based composites at low cost is needed. This chapter introduces new technology using the electrochemical (EC) technique of cyclic voltammetry to reduce GO, and shows that surface plasmon resonance (SPR) technology can be used to detect refractive index variations of dielectric materials near the metal surface while simultaneously using surface plasmon waves (SPWs) to detect the reduction of GO. It is important to understand the mechanisms of the atomic construction of GO surface oxygen-containing functional groups so that they can be developed in bulk for biosensor and optoelectronic applications. Directions for future research in the field of rGO film-based composites include increasing the stability of the electrodes, improving charge carrier mobility, tuning the dielectric layer and its optical band-gap properties, enhancing the binding interaction to improve the sensitivity of biosensors using the film, and modulating the SP resonance energy.
关键词： cyclic voltammetry (CV),reduced graphene oxide (rGO),Graphene oxide (GO),electrochemical surface plasmon resonance (EC-SPR)
更新于2025-09-11 14:15:04
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Study on the thermal, dielectric, dynamic, mechanical analysis of graphene decorated with Graphene Quantum Dots (GDGQD) reinforced epoxy nanocomposite
摘要： The thermal conductivity, dielectric properties and Dynamic Mechanical Analysis (DMA) were studied for Graphene Decorated with Graphene Quantum Dots (GDGQD)-epoxy nanocomposite. A maximum thermal conductivity enhancement of 19 % registered for 0.75 wt. % GDGQD sample where a low acoustic impedance mismatch between the interface of GDGQD fillers and the epoxy matrix occur and a dielectric constant increase of 6 % due to the better charge accumulation at the conductive filler/ insulating polymer interface of the composite. Further DMA is performed using the cantilever mode. The loss modulus peak obtained for 0.75 wt. % GDGQD-epoxy sample given a maximum value due to the interface interaction and the corresponding storage modulus shown a maximum increment of 21%, due to the molecular dynamics and cross-linking density of the epoxy matrix with GDGQD. The thermal stability of the samples evaluated using Thermal Gravimetric Analysis (TGA) shown an improvement in glass transition temperature (Tg) of nanocomposite for 0.75 wt. % GDGQD by 11°C where a greater dispersion of the fillers and efficient functional groups interaction are responsible factors.
关键词： Dynamic Mechanical Analysis (DMA),Graphene Oxide (GO),Thermal gravimetric analysis (TGA),GDGQD
更新于2025-09-11 14:15:04
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NaYF4@Yb,Ho,Au/GO-nanohybrid materials for SERS applications –Pb(II) detection and prediction
摘要： Nowadays, nano hybrid materials (NHMs) with latent applications have been employed in different fields, particularly for sensor applications. Among NHMs, GO based - upconversion NHMs system is an emerging area for the rapid detection of different hazardous materials either as an aptamer based or free-labeled sensing techniques. For the detection of Pb(II) in water, NaYF4@Yb,Ho,Au/GO-NaYF4@Yb,Ho,Au NHMs system was developed. The synthesized NHMs were characterized by XRD, FT-IR, SEM with EDS, TEM and Raman characterization techniques for observation and confirmation. NaYF4@Yb,Ho,Au/GO-NaYF4@Yb,Ho,Au NHMs fabricated sensors were observed to detect and quantify on real-time basis Pb(II) via surface-enhanced-Raman spectroscopy within the dynamic linear range of 98 – 99%, with detection limits of 1.16 × 10-9 g/mL and 1.15×10-8 g/mL obtained respectively for NaYF4@Yb,Ho,Au and GO- NaYF4@Yb,Ho,Au NHMs.. The relative standard deviation (RSD) value achieved for both were less than ~10%, indicative of reproducibility in the quantification results for Pb(II) traces in water when combined with genetic algorithm partial least square (GA-PLS). Results suggest that the GO-NHMs better enhanced the SERS Pb (II) vis-à-vis NaYF4@Yb,Ho,Au. The GO-wrapped NHMs exhibited a further better SERS performance because the heterostructure of GO-NHMs could be potentially useful for SERS-based immunoassay due to the much easier charge transfer between graphene and the metal ions and molecules so the homogeneity of the SERS probe was improved simultaneously (chemical enhancement) by GO-NHMs.
关键词： Graphene Oxide (GO),Pb(II),Nano hybrid materials (NHMs),Chemometric algorithms modeling (GAPLS),SERS
更新于2025-09-09 09:28:46