Robust self-cleaning effects of cotton fabrics coated with reduced graphene oxide (RGO)-titanium dioxide (TiO2) nanocomposites

The self-cleaning textiles coated with reduced graphene oxide-titanium dioxide (TiO2) nanocomposites have enhanced photocatalytic activities and could have great potential in practical applications. However, it is still problematic regarding how to avoid aggregation of reduced graphene oxide nanosheets in producing reduced graphene oxide-TiO2 nanocomposites. In this research article, we propose a new method to reduce the aggregation of reduced graphene oxide nanosheets in producing cotton fabrics coated with reduced graphene oxide-TiO2 nanocomposites by combining vibration-assisted ball milling and hydrothermal synthesis process. The microstructure and photocatalytic-related properties of the resultant reduced graphene oxide-TiO2 nanocomposites and their coating cotton fabrics were characterized by using a series of techniques including field emission scanning electron microscope (FESEM), atomic force microscope (AFM), X-ray diffraction spectroscopy (XRD), Raman, particle size distribution, Brunauer-Emmett-Teller,(BET), transmission electron microscope (TEM), X-ray photoelectron spectrometer (XPS), diffuse reflectance spectra (DRS), ultraviolet photoelectron spectroscope (UPS), and photoluminescence (PL). It was indicated that the aggregation of reduced graphene oxide nanosheets in reduced graphene oxide-TiO2 nanocomposites was successfully avoided via ball milling in the presence of tetrabutyl titanate. After hydrothermal treatment, the resulting reduced graphene oxide-TiO2 nanocomposites were firmly immobilized on cotton fabric. It was demonstrated in the self-cleaning experiments that the resultant self-cleaning cotton fabrics are hydrophilic and could directly decompose color contaminants such as methylene blue, Congo red, and coffee stains under simulated sunlight irradiation due to the photo-degradation reactions of the reduced graphene oxide-TiO2 nanocomposite coating. The reduced graphene oxide-TiO2 nanocomposite-modified cotton fabric also exhibited excellent performance in both robust abrasion resistance and soap-washing resistance. The fabric photocatalytic self-cleaning capability was not found to decrease significantly after being repeatedly used for five times.

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Reduced Graphene Oxide-Wrapped Super Dense Fe3O4 Nanoparticles with Enhanced Electromagnetic Wave Absorption Properties

Nanomaterials ◽

10.3390/nano9060845 ◽

2019 ◽

Vol 9 (6) ◽

pp. 845

Author(s):

Qi Yu ◽

Yiyi Wang ◽

Ping Chen ◽

Weicheng Nie ◽

Hanlin Chen ◽

...

Keyword(s):

Graphene Oxide ◽

Electromagnetic Wave ◽

Electron Microscope ◽

Reduced Graphene Oxide ◽

Fe3o4 Nanoparticles ◽

Absorption Properties ◽

Electromagnetic Wave Absorption ◽

X Ray ◽

Wave Absorption ◽

Reduced Graphene

The efficient preparation of electromagnetic wave absorbing materials with low density and excellent electromagnetic wave absorption remains a considerable challenge. In this study, reduced graphene oxide (RGO) wrapped Fe3O4 nanoparticles (NPs) were synthesized based on one-step reaction by the reduction of graphene oxide (GO), and the generation of super-fine Fe3O4 NPs was achieved. The phase structure, chemical composition, micromorphology, and magnetism were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscope (XPS), scanning electron microscope (SEM), transmission electron microscope (TEM), and vibrating sample magnetometer (VSM), respectively. The electromagnetic characteristics were evaluated on a vector network analyzer by the coaxial line method. The results showed that super-fine Fe3O4 NPs with an average size of 6.18 nm are densely distributed on the surface of graphenes. The RGO/Fe3O4 nanocomposites exhibited excellent microwave absorption properties with a minimum reflection loss (RL) of up to −55.71 dB at 6.78 GHz at 3.5 mm thickness and the highest effective absorption bandwidth with RL values exceeding −10 dB is 4.76 GHz between 13.24 and 18 GHz at 1.7 mm thickness. This work provides a concise method for the development of RGO supported super dense Fe3O4 nanocomposites for high performance electromagnetic absorption applications.

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Reduced graphene oxide/TiO2 nanocomposites coating of cotton fabrics with antibacterial and self-cleaning properties

Journal of Industrial Textiles ◽

10.1177/1528083718779447 ◽

2018 ◽

Vol 49 (3) ◽

pp. 277-293 ◽

Cited By ~ 13

Author(s):

Miruna S Stan ◽

Ionela C Nica ◽

Marcela Popa ◽

Mariana C Chifiriuc ◽

Ovidiu Iordache ◽

...

Keyword(s):

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Large Scale ◽

Color Change ◽

Water Repellency ◽

Cotton Fabrics ◽

Hydrothermal Conditions ◽

Antimicrobial Efficiency ◽

Reduced Graphene ◽

Self Cleaning

Textile materials can be easily used as a support for the nano-decoration with active particles in order to gain new features such as self-cleaning, antimicrobial efficiency, water repellency, mechanical strength, color change and protection against ultraviolet radiations. In this context, our present research reports the fabrication and characterization (physico-chemical analysis and surface morphology) of cotton fabrics treated with reduced graphene oxide decorated with two types of TiO2 nanoparticles co-doped with 1% iron and nitrogen atoms (TiO2/rGO NPs) and synthesized in different hydrothermal conditions by a simultaneous precipitation of Ti3+ and Fe3+ ions to achieve their uniform distribution or after a sequential precipitation of these two cations for obtaining a higher concentration of iron on the surface of Ti4+ oxyhydroxide. Further, the antimicrobial efficiency of these TiO2/rGO-treated textiles and their influence on human cells were assessed. We demonstrated the successful development of TiO2/rGO coating of cotton fabrics which are harmless for human skin cells and inhibit the growth of Staphylococcus aureus and Enterococcus faecalis. These findings confirm their great potential as novel graphene-based materials for biomedical and photocatalytic applications and this approach could be used for the large-scale fabrication of innovative self-cleaning and antimicrobial textiles.

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Photocatalytic self-cleaning electrochemical sensor for honokiol based on a glassy carbon electrode modified with reduced graphene oxide and titanium dioxide

Microchimica Acta ◽

10.1007/s00604-017-2239-7 ◽

2017 ◽

Vol 184 (7) ◽

pp. 2299-2305 ◽

Cited By ~ 2

Author(s):

Yan Lei ◽

Fan Yang ◽

Yu-Tao Li ◽

Lina Tang ◽

Keli Chen ◽

...

Keyword(s):

Titanium Dioxide ◽

Graphene Oxide ◽

Electrochemical Sensor ◽

Reduced Graphene Oxide ◽

Glassy Carbon Electrode ◽

Glassy Carbon ◽

Carbon Electrode ◽

Reduced Graphene ◽

Self Cleaning

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Novel Composite Electrode of the Reduced Graphene Oxide Nanosheets with Gold Nanoparticles Modified by Glucose Oxidase for Electrochemical Reactions

Catalysts ◽

10.3390/catal9090764 ◽

2019 ◽

Vol 9 (9) ◽

pp. 764 ◽

Cited By ~ 1

Author(s):

Dong ◽

Yu ◽

Liu ◽

Shao ◽

...

Keyword(s):

Electron Microscopy ◽

Gold Nanoparticles ◽

Graphene Oxide ◽

Glucose Oxidase ◽

Reduced Graphene Oxide ◽

Direct Electron Transfer ◽

Cyclic Voltammograms ◽

Graphene Oxide Nanosheets ◽

X Ray ◽

Reduced Graphene

Graphene-based composites have been widely explored for electrode and electrocatalyst materials for electrochemical energy systems. In this paper, a novel composite material of the reduced graphene oxide nanosheets (rGON) with gold nanoparticles (NPs) (rGON-AuNP) is synthesized, and its morphology, structure, and composition are characterized by scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), energy dispersive X-ray (EDX), Fourier transform infrared spectroscopic (FTIR), Raman, and UV-Vis techniques. To confirm this material’s electrochemical activity, a glucose oxidase (GOD) is chosen as the target reagent to modify the rGON-AuNP layer to form GOD/rGON-AuNP/glassy carbon (GC) electrode. Two pairs of distinguishable redox peaks, corresponding to the redox processes of two different conformational GOD on AuNP, are observed on the cyclic voltammograms of GOD/rGON-AuNP/GC electrode. Both cyclic voltammetry and electrochemical impedance spectroscopy are employed to study the mechanism of direct electron transfer from GOD to GC electrode on the rGON-AuNP layer. In addition, this GOD/rGON-AuNP/GC electrode shows catalytic activity toward glucose oxidation reaction.

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Improved Synthesis of Reduced Graphene Oxide-Titanium Dioxide Composite with Highly Exposed{001}Facets and Its Photoelectrochemical Response

International Journal of Photoenergy ◽

10.1155/2014/650583 ◽

2014 ◽

Vol 2014 ◽

pp. 1-9 ◽

Cited By ~ 16

Author(s):

Gregory S. H. Thien ◽

Fatin Saiha Omar ◽

Nur Ily Syuhada Ahmad Blya ◽

Wee Siong Chiu ◽

Hong Ngee Lim ◽

...

Keyword(s):

Titanium Dioxide ◽

Graphene Oxide ◽

Electron Microscope ◽

Reduced Graphene Oxide ◽

Fold Increase ◽

Photocurrent Density ◽

High Yield ◽

Crystal Facet ◽

Reduced Graphene ◽

Microscope Imaging

Crystal facet engineering has attracted worldwide attention, particularly in facet manipulation of titanium dioxide (TiO2) surface properties. An improved synthesis by solvothermal route has been employed for the formation of TiO2with highly exposed001facets decorated on reduced graphene oxide (RGO) sheets. The RGO-TiO2composite could be produced with high yield by following a stringently methodical yet simple approach. Field emission scanning electron microscope and high resolution transmission electron microscope imaging reveal that the structure consists of TiO2nanoparticles covered with TiO2nanosheets of exposed001facets on a RGO sheet. The photocurrent response of the RGO-TiO2composite was discovered to outperform that of pure TiO2, as a ~10-fold increase in photocurrent density was observed for the RGO-TiO2electrodes. This may be attributed to rapid electron transport and the delayed recombination of electron-hole pairs due to improved ionic interaction between titanium and carbon.

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Silver Nanocomposites Decorated Reduced Graphene Oxide Nanosheets for Electrochemical Sensor Applications

Oriental Journal Of Chemistry ◽

10.13005/ojc/340626 ◽

2018 ◽

Vol 34 (6) ◽

pp. 2872-2877 ◽

Cited By ~ 5

Author(s):

V. Rama Lakshmi ◽

J. Balavijayalakshmi

Keyword(s):

Silver Nanoparticles ◽

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Carbon Nanostructures ◽

Electrochemical Techniques ◽

X Ray Diffraction ◽

Graphene Oxide Nanosheets ◽

Detection Range ◽

X Ray ◽

Reduced Graphene

Recently, metal nanoparticles incorporated carbon nanostructures have tremendous applications in the field of nanosensor and technologies. In the proposed work, silver nanoparticles (Ag) decorated reduced graphene oxide nanosheets (rGONS) (rGONS-Ag) are synthesized and developed for the sensitive detection of ortho-Nitrophenol (o-NP) using electrochemical techniques. The rGONS-Ag nanocomposites are synthesized through chemical reduction method. The physical and electrochemical behaviour of the synthesized rGONS-Ag nanocomposites are characterized by using Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), Scanning electron microscope (SEM), Energy dispersive X-ray spectroscopy (EDAX), Transmission electron microscopy (TEM) and Cyclic voltammetry (CV) techniques. The X-ray diffraction analysis reveals the formation of well crystalline silver nanoparticles (AgNp’s) on the surface of rGO nanosheets with the crystallite size of about 22.775 nm. The morphological analysis reveals the formation of well distributed cubic shape AgNp’s on the surface of rGO nanosheets. The rGONS‐Ag nanocomposites modified glassy carbon electrode (GCE) shows the good electrochemical detection performance for ortho-Nitrophenol (o-NP) with the linear detection range from 2 mM to 8 mM and with the sensitivity of about 0.221 mA mM-1 cm-2.

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Optimum Reduced Graphene Oxide (rGO) Volume for Hydrothermal Synthesis of Titanium Dioxide (TiO2) Nanostructure Direct Growth on Fluorine-Doped Tin Oxide (FTO)/rGO Substrate

Journal of Computational and Theoretical Nanoscience ◽

10.1166/jctn.2020.8736 ◽

2020 ◽

Vol 17 (2) ◽

pp. 886-892

Author(s):

A. Talib ◽

M. K. Ahmad ◽

N. Ahmad ◽

N. Nafarizal ◽

F. Mohamad ◽

...

Keyword(s):

Titanium Dioxide ◽

Graphene Oxide ◽

Solar Cells ◽

Solar Cell ◽

Reduced Graphene Oxide ◽

Dye Sensitized Solar Cells ◽

X Ray ◽

Dye Sensitized ◽

Reduced Graphene ◽

Sensitized Solar Cells

Titanium dioxide or titania shows a great interest in solar cell application due to its morphology and crystalline structure. Moreover, it is an affordable compound that could make solar cells more cost economical than traditional silicon solar cells. In this study, the influence of rutile Titanium Dioxide (TiO2) deposit on reduced Graphene Oxide (rGO) as photoanode through one-step hydrothermal technique is demonstrated to synthesis rutile TiO2 nanorods (NRs) and nanoflowers (NFs) morphology in nanoscale dimension with different rGO volume for Dye-sensitized solar cells (DSSCs) application. The successful synthesis of TiO2 on FTO/rGO was confirmed using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray (EDX) spectroscopy, ultraviolet-visible (UV-Vis) spectrophotometry and incident photon-to-current conversion efficiency (IPCE) spectra. The performance of dye-sensitized solar cells as outcome of rGO contents in solar cell was also examined. The optimal performance result in contrast with liquid electrolyte based solar cell has been approved over photovoltaic performance study in terms characteristics of open circuit voltage (Voc), short circuit current (Jsc) and solar conversion efficiency.

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