Preparation and Characterisation of Surface Adsorbed Reduced Graphene Oxide/Polyaniline Nanocomposite on Polymer Membrane for Trimethylamine Sensing

2015 ◽  
Vol 1119 ◽  
pp. 24-28
Author(s):  
Rey Alfred G. Rañola ◽  
Isabella Concina ◽  
Elisabetta Comini ◽  
Fortunato B. Sevilla ◽  
Giorgio Sberveglieri
Keyword(s):  
Self Assembly ◽  
Limit Of Detection ◽  
Polymer Nanocomposite ◽  
Solution Blending ◽  
Flexible Material ◽  
Adsorbed Polymer ◽  
Blending Method ◽  
Reduced Graphene ◽  
Ft Ir

A graphene/polyaniline (rGO/PANi) nanocomposite was synthesized by solution blending method and deposited on to a nylon-6 membrane via vacuum assisted self-assembly (VASA) method to fabricate a flexible material applied as a chemoresistive gas sensor for trimethylamine (TMA). The morphological and structural characterization of surfaced adsorbed polymer nanocomposite was carried out by FT-IR, SEM, UV-Vis and surface profilometry. While, electrical property was carried out by four-point probe measurement. Prepared rGO/PANi nanocomposite has a percolation threshold around 0.40% vol. fraction, with a conductivity of 8.28 S/m (rsd = 3.0%, n=3) and thickness around 38.58 μm (rsd = 7.63%, n=3. The composite sensor exhibited linear range from 45 to 230 mg/L (r2= 0.9962) and the calculated limit of detection was 25.30 mg/L. It exhibited a repeatable response to TMA gas.

Synthesis and Characterization of Reduced Graphene Oxide Film as Electronic Material

2011 ◽  
Vol 287-290 ◽  
pp. 2356-2359
Author(s):  
Juan Yang ◽  
Chuan Liang Zang ◽  
Lei Sun ◽  
Nan Zhao ◽  
Ya Zhou Zhou
Keyword(s):  
Graphene Oxide ◽  
Raw Materials ◽  
Large Area ◽  
Filtration Method ◽  
Vacuum Filtration ◽  
Structure And Morphology ◽  
Reduced Graphene ◽  
Thermal Annealing Process ◽  
Ft Ir

Large area graphene oxide (GO) film was prepared by vacuum filtration method through a membrane with a pore size of 25 nm, using GO sheets suspension as raw materials. The film was thermal treated in Ar/H2 atmosphere at 600°C to make the film electrical conductive. The structure and morphology of the obtained film were investigated by XRD, Raman, FT-IR and SEM. Results showed that most oxygen-containing functional groups in GO film were reduced during the thermal annealing process. The obtained reduced film showed excellent electrical conductivity and the average sheet resistance of the reduced film was 11.3 Ω□-1.

Preparation and properties of reduced graphene oxide/polyimide composite films

2019 ◽  
Vol 32 (1) ◽  
pp. 65-72 ◽  
Author(s):  
Xiaocui Li ◽  
Xiaohong Fang ◽  
Pengbo Zhang ◽  
Jingyuan Yan ◽  
Yigang Chen ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
High Performance ◽  
Coefficient Of Thermal Expansion ◽  
Composite Films ◽  
Graphene Oxides ◽  
Solution Blending ◽  
Blending Method ◽  
Reduced Graphene ◽  
Photoelectric Devices

We have successfully prepared reduced graphene oxide/polyimide (RGO/PI) composite films by solution blending method and thermal annealing. The effects of contents of graphene oxides (GOs) and different anneal temperatures were mainly investigated. The oxygen-containing groups on GOs’ surface can lead to the formation of hydrogen bonds between GO and PI, which are benefit for GO to disperse in PI uniformly and improve PI properties. The coefficient of thermal expansion decreased drastically from 15.46 μm/(m·°C) to 3.94 μm/(m·°C) within the range of 100–300°C, and the glass transition temperature increased. These improvements can help RGO/PI films resist the high temperature when preparing photoelectric devices and get high-performance flexible photoelectric devices. The elastic modulus of RGO/PI films increased slightly, and tensile strength of RGO/PI films remained the same, while the elongation at break decreased.

Preparation, Characterization and Properties of Biodegradable GO/PPC Composites

2013 ◽  
Vol 469 ◽  
pp. 112-116
Author(s):  
Xia He ◽  
Ling Ling Wu ◽  
Jia Jun Wang ◽  
Hai Long Liu
Keyword(s):  
Thermal Properties ◽  
Food Packaging ◽  
Thermo Gravimetric Analysis ◽  
Gravimetric Analysis ◽  
Thermo Gravimetric ◽  
Promising Alternative ◽  
Solution Blending ◽  
Blending Method ◽  
Ft Ir ◽  
Poly Propylene

A novel biodegradable and biocompatible composite of Poly (propylene carbonate) (PPC) and graphenes oxide (GO) was prepared by a solution blending method. The chemical structure, thermal properties and microscopic morphologies of the GO/PPC composites were characterized by Fourier transform infrared spectroscopy (FT-IR), thermo gravimetric analysis (TGA) and scanning electron microscopy (SEM). It was shown that the GO/PPC composites with 0.75 wt% GO performed a significant improvement on mechanical properties and thermal properties, as compared with the neat PPC. This composite could become a promising alternative to non-biodegradable for food packaging materials.

scholarly journals Preparation and characterization of ancient recipe of organic Lime Putty-Evaluation for its suitability in restoration of Padmanabhapuram Palace, India

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
M. Shivakumar ◽  
Thirumalini Selvaraj ◽  
Magesh Peter Dhassaih
Keyword(s):  
Fatty Acids ◽  
Unsaturated Fatty Acids ◽  
Limit Of Detection ◽  
Setting Time ◽  
Aloe Vera ◽  
Water Repellency ◽  
Limit Of Quantification ◽  
Hydraulic Lime ◽  
Ft Ir

AbstractThe study aims at preparation and characterization of six organic lime putty (hydraulic Lime + fermented plant extract) using regionally available plants namely Terminalia Chebula (kadukkai), Rosa Sinensis (hibiscus), Palm jaggery (refined sugar), Xanthorrhoeaceae (aloe vera), and Indigofera Tinctoria (neelamari) as per the methods given in the ancient palm leaf of Padmanabhapuram Palace, India. Advanced analytical techniques like Gas chromatography-mass spectroscopy (GC–MS), UV-Spectrophotometer and carbon dioxide quantification were used to study the fermented plant extracts and Fourier transform-infrared spectroscopy (FT-IR), X-ray Diffraction (XRD), Field emission-scanning electron microscopy (FESEM) to study hydrated phases and microstructure of organic lime putty. GC–MS recorded the phytochemical compounds like fatty acids, traces of proteins, polysaccharides and carbohydrates. Fermented kadukkai and neelamari extracts reported as fatty acid, palm jaggery as carbohydrate, hibiscus as polysaccharide and aloevera rich in all the biomolecules. The detection limit of Quantification:0.013 and limit of detection:0.067 for polysaccharides, 0.026 and 0.088 for unsaturated fatty acids was reported through a U.V spectrophotometer for all the herbs. Aloevera and neelamari fermented extracts recorded the CO2 release around 96,000 and 90,000 ppm on 4th day of fermentation, whereas for other herbs it ranged below the recorded readings. Supply of CO2 has initiated the internal carbonation of the lime putty and precipitation of calcite in three different forms aragonite, calcite and vaterite minerals. The addition of organics resulted in high-intensity portlandite peaks and calcium carbonate polymorphs as reported in XRD graphs in agreement with FT-IR analysis. FESEM morphology validated the early formation of carbonate polymorphs, and EDX. has shown that kadukkai lime putty, jaggery lime putty and reference lime putty. mixes have calcium around 35–45%. From the overall results, 3% addition of eco-friendly biopolymers has altered the properties like setting time, water repellency and higher carbonation rate, which is the main reason behind longevity of the structure.

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