- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Improving the Wear Life of a-C:H Film in High Vacuum by Self-Assembled Reduced Graphene Oxide Layers
摘要： As an energy-e?cient surface modi?cation method, self-assembly has been the subject of extensive research. However, its application on carbon ?lm has been rarely reported. In the present work, a novel self-assembled reduced graphene oxide (RGO) was prepared on a-C:H ?lm by a controllable self-assembly method, and the friction behavior of the RGO/a-C:H ?lm was investigated under vacuum environment. Interestingly, the RGO/a-C:H ?lm exhibited signi?cant improvement of anti-wear ability in vacuum conditions under a high applied load of 5 N. As expected, the synergy lubrication e?ect of the RGO layer and a-C:H ?lm should account for the excellent friction reduction and anti-wear ability of a RGO/a-C:H multilayer ?lm.
关键词： vacuum,wear,reduced graphene oxide,a-C:H ?lm,carbon materials,self-assembly
更新于2025-09-16 10:30:52
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Engineering carbon quantum dots for enhancing the broadband photoresponse in a silicon process-line compatible photodetector
摘要： Realization of heterojunction based broadband photodetectors (ultraviolet to near-infrared) compatible with existing silicon process technology has great promise for advanced optoelectronic applications. In this report, we demonstrate the application of carbon quantum dots (CQDs) synthesized from organic waste via a facile fabrication technique as a potential broadband photodetector in a hybrid (organic–inorganic) heterostructure with Si. The broadband photoresponse is further improved by impregnating the CQDs with reduced graphene oxide (rGO) and silver nanoparticles (AgNPs). The results show that the optimized incorporation of rGO aids in enhancing the photoresponse due to effective carrier transport, whereas AgNPs intensify the optical absorption due to localized surface plasmon resonance. The maximum responsivity and detectivity for the engineered CQDs are found to be around 1 A W?1 and 2 × 1012 Jones, respectively. This work demonstrates an economic, effective and feasible approach to harness natural resources for technological purposes, which can efficiently be adopted with presently available industry scale technologies.
关键词： silver nanoparticles,reduced graphene oxide,carbon quantum dots,silicon process technology,broadband photodetector
更新于2025-09-16 10:30:52
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The transparent Schottky junction of reduced graphene oxide/SnO <sub/>2</sub> nanoarrays towards enhanced broadband photoresponse
摘要： The rGO/SnO2 nanoarrays (rGO/SnO2 NAs) Schottky junction is synthesized by a series of RF magnetron sputtering, hydrothermal and electrochemical deposition. The unique transparent junction exhibits the broadband photoelectric responses from the ultraviolet to visible light. As shown, the proper rGO/SnO2 NAs display highly transparency of about ~60% and dramatically enhance photoelectric conversion of about ~100 times than that of the initial Schottky junction. Finally, the mechanism of the Schottky junction is investigated.
关键词： reduced graphene oxide,broadband photoresponse,transparent Schottky junction,SnO2 nanoarrays
更新于2025-09-16 10:30:52
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Study of the photocatalytic performance and carrier migration of reduced graphene oxide-modified infrared-responsive photocatalyst β-NaYF4:Yb3+, Er3+@BiOCl-rGO
摘要： To further enhance the photocatalytic performance of BiOCl, a facile hydrothermal reduction reaction was used to synthesize the reduced graphene oxide- (rGO-) modified ternary compound photocatalyst β-NaYF4:Yb3+, Er3+@BiOCl-rGO (NYF–Bi-rGO). rGO prepared using a hydrothermal method showed good conductivity. Furthermore, the specific surface area of NYF-Bi-rGO was 20-fold larger than that of NYF, which is a quality that could prove highly advantageous for use in pollutant adsorption. In addition, the ternary photocatalytic system produced by rGO increased the absorption intensity of NYF-Bi in the visible light region, and caused a red-shift of the entire absorption cross-section. In particular, analysis of carrier migration showed the introduction of rGO promoted the separation of the photoelectron-hole pairs of BiOCl, inhibited its recombination and improved the photocatalytic efficiency of the ternary photocatalyst NYF-Bi-rGO.
关键词： Photocatalytic degradation,Characterization,BiOCl nanosheets,Reduced graphene oxide (rGO)
更新于2025-09-16 10:30:52
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The fabrication of graphene-polypyrrole composite for application with dye-sensitized solar cells
摘要： This research is to study the preparation of graphene-monodispersed polypyrrole composite materials for uses as a counter electrode in dye-sensitized solar cells (DSSCs). The preparation started with the synthesis of graphene oxide (GO), followed by the preparation of composite films by polymerization method and the GO reduction process by ascorbic acid. The characterizations included thermal-gravimetric analysis (TGA), fourier transform infrared spectroscopy (FTIR), raman spectroscopy, X-ray diffraction (XRD), field-emission electron microscopy (FESEM) and cyclic voltammetry (CV). The DSSCs’ efficiency tests were also conducted and analyzed. Based on the test results, it was found that DSSCs prepared from PPy/RGO-5 composite films with 5% by weight of reduced graphene oxide (RGO) could give an optimal efficiency. Nevertheless, the efficiency of such solar cells was much less than that of DSSCs with platinum counter electrode. This could be due to incomplete reduction of graphene oxide, resulting low electron transfer ability and electrocatalytic activity toward the reduction of electrolyte solution.
关键词： Reduced graphene oxide,Polypyrrole,Dye-sensitized solar cells,Counter electrode
更新于2025-09-16 10:30:52
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Investigating the Role of Reduced Graphene Oxide as a Universal Additive in Planar Perovskite Solar Cells
摘要： In this work we present the effects of the incorporation of reduced graphene oxide (rGO) nanoflakes into the titania compact layer, the methylammonium lead iodide (CH3NH3PbI3) absorber and the Spiro-MeOTAD hole transporter which are typical components of a planar perovskite solar cell (PSC). The addition of rGO within the TiO2 electron transport layer (ETL) offers fast electron transport rates toward the anode and favors the growth of large, uniform perovskite crystals. When added in MAPbI3, rGO further increases the perovskite grains size and creates a more homogenous and smooth film with enhanced crystallinity, thus improving the power conversion efficiency (PCE) of the corresponding PSC. On the contrary, its presence in Spiro-MeOTAD is detrimental for the cells performance. For the first time in the literature a graphene derivative favors the performance of a MAPbI3–based PSC when incorporated as an additive in both the ETL and the perovskite absorber. As a result, we obtained devices with optimized electrical characteristics, resulting to stabilized 13.6% PCE, outperforming by 20% the reference (rGO-free) ones. Moreover, the presence of rGO offered additional stability to the solar cells which retained 40% of their initial PCE after 50 days of storage in mildly humid, dark environment.
关键词： Reduced graphene oxide,Lead acetate,Planar perovskite solar cells,MAPbI3 absorber,Titania compact layer
更新于2025-09-16 10:30:52
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Fabrication of Titanium Dioxide-reduced Graphene Oxide (TiO <sub/>2</sub> /rGO) nanocomposites as the Photoanode in Dye Sensitized Solar Cells
摘要： One of the photovoltaic cells generation promising for low-cost fabrication is dye-sensitized solar cell (DSSC). However, it has a drawback─low efficiency because of electron recombination occurrence and low transparency of photoanode. Graphene-based materials show the potential to overcome this problem. In this work, we have investigated the integration of reduced graphene oxide (rGO) into the titanium dioxide (TiO2) photoanode in DSSC. A simple Hummer’s method has been used to synthesize graphene oxide flakes. The nanocomposite of rGO/TiO2 has been formed by varying the percentage of rGO between 1% and 5%. The result shows that the percentage of rGO in nanocomposite affected device performance. The efficiency decreases along with the increase in rGO. The best result was obtained with 2 wt% addition of rGO into TiO2 photoanode that resulted in 0.9 % efficiency.
关键词： Dye-sensitized solar cell,titanium dioxide,nanocomposite,reduced graphene oxide,photoanode
更新于2025-09-16 10:30:52
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Laser synthesis of magnetite-partially reduced graphene oxide nanocomposites for arsenate removal from water
摘要： Herein, we report the development of a facile process for the synthesis of magnetite-partially reduced graphene oxide (Mag-PRGO) without the use of chemical reducing agents or solvents for the efficient removal of arsenate As(V) ions from contaminated water. The Mag-PRGO is synthesized using the laser vaporization-controlled condensation method where a compressed target consisting of metallic iron (Fe) powder and solid graphene oxide (GO) is laser vaporized in an O2–He atmosphere resulting in the simultaneous oxidation of the Fe nanoparticles and the partial reduction of the GO to form the Mag-PRGO nanocomposite where the magnetic Fe3O4 nanoparticles are anchored to the surface of the PRGO nanosheets. FTIR, Raman, XPS, XRD, TEM, and SEM confirm the successful attachment of the magnetic Fe3O4 nanoparticles to the PRGO nanosheets. The Mag-PRGO (50 wt% Fe) adsorbent shows exceptional selectivity for the extraction of As(V) ions with a capacity of 132 mg/g with no leaching of Fe ions into the solution, placing it among the best carbon-based materials for the efficient removal of As(V) from aqueous solutions. The Mag-PRGO displays a 100% removal of As(V) at concentrations up to 100 ppm with 98% and 100% removal within 15 min and 30 min, respectively, at 50 ppm concentration. The excellent agreement of the experimental sorption isotherms with the Langmuir model suggests a monolayer adsorption behavior. The mechanism of As(V) removal is based on surface complexation between the protonated hydroxyl groups on the surface of Mag-PRGO and the monobasic and dibasic arsenate anions forming (Fe–O–As) bonds as confirmed by FTIR and XPS. The Mag-PRGO is easily regenerated with the desorption of the As(V) ions reaching 99% from their maximum sorption capacities using NaOH. The efficient magnetic separation and high chemical stability of Mag-PRGO are demonstrated over six adsorption–desorption cycles of As(V). The Mag-PRGO is proposed as an excellent remediation adsorbent for the extraction of As(V) from contaminated water.
关键词： Magnetite-partially reduced graphene oxide,Arsenate removal,Water remediation,Adsorption,Laser vaporization-controlled condensation
更新于2025-09-16 10:30:52
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Fabrication of architectural structured polydopamine-functionalized reduced graphene oxide/carbon nanotube/PEDOT:PSS nanocomposites as flexible transparent electrodes for OLEDs
摘要： High performance, flexible transparent conductive films with a structure similar to that of reinforced concrete and constructed by sandwiching single-walled carbon nanotubes (SWCNT) between poly (3,4-ethylene dioxythiophene):poly (styrene sulfonate) (PEDOT:PSS) and polydopamine functionalized reduced graphene oxide (PDA-RGO) were fabricated using simple spray coating. Mussel-inspired polydopamine was introduced as a graphene oxide reducing agent and modifier; the obtained PDA-RGO improved the interfacial adhesion between the conductive coating layers and substrate, and an effective post fabrication treatment method was performed on the hybrid film to achieve better conductivity. It was found that the resulting electrode exhibited a low sheet resistance of 52.2 Ω/sq. with a high optical transmittance of 88.7% at 550 nm. Moreover, the transparent film exhibited long-term stability with a relatively low roughness (ca. 2.41 nm), and its architectural structure sustained the flexibility of the film during bending. The organic light emitting diodes which using PDA-RGO/SWCNT/PEDOT:PSS film as anode was successfully fabricated, the luminance of the device was 2032 cd/cm2 at 15 V and the maximum current efficiency was 2.13 cd/A at 14 V, indicating the strong potential of this type of transparent electrode for flexible electroluminescent devices.
关键词： OLEDs,Polydopamine Functionalized Reduced Graphene Oxide,PEDOT:PSS,Flexible transparent conductive films,Carbon nanotubes
更新于2025-09-16 10:30:52
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In situ thermal conversion of graphene oxide films to reduced graphene oxide films for efficient dye-sensitized solar cells
摘要： Severe aggregation of reduced graphene oxide nanosheets and their weak adhesion to the conductive substrate largely restricts the electrocatalytic property. To overcome this flaw, we propose a simple strategy for fabrication of efficient reduced graphene oxide film through in-situ thermal conversion of graphene oxide film that is first adsorbed onto the conductive substrate. As compared to the reduced graphene oxide film prepared from the direct adsorption of reduced graphene oxide nanosheets, the reduced graphene oxide film obtained from the in-situ thermal conversion of graphene oxide film exhibits much higher electrocatalytic activity on the reduction of I3? due to the stronger adhesion to the conductive substrate and better film quality without aggregation. The thermal-converted reduced graphene oxide cathode produces much higher power conversion efficiency (6.35%) than that (1.20%) for the directly adsorbed reduced graphene oxide cathode. This work opens up a new avenue for preparation of simple and low-cost cathodes.
关键词： Reduced graphene oxide,Counter electrode,Graphene oxide,In situ thermal conversion,Dye-sensitized solar cell
更新于2025-09-12 10:27:22