Doping of Polymers with ZnO Nanostructures for Optoelectronic and Sensor Applications

Aga,; Mu,

doi:10.5772/39487

Cited by 6 publications

(4 citation statements)

References 43 publications

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“…The fabrication of nanoorganized catalyst provides an effective way to overcome the relatively wide band gap as well as the high recombination rates of electron-hole pairs, photogenerated in ZnO [17,18]. There are many different procedures used for synthesis of ultrafine oxide nanoparticles such as hydrothermal, sol-gel, solvothermal, emulsion precipitation, flame combustion, fungus mediated biosynthesis, etc [19,20,21,22,23,24,25,26,27]. A new, environmentally friendly and promising approach in the metal oxide synthesis is the involvement of polysaccharides [28].…”

Section: Introductionmentioning

confidence: 99%

Novel starch-mediated synthesis of Au/ZnO nanocrystals and their photocatalytic properties

Peychev

Vasileva

2021

Heliyon

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A novel solution-solid synthesis method for preparation of ZnO and Au/ZnO composite nanocrystals using starch matrix has been developed and optimized. The process is characterized by simplicity, environmental compatibility and good performance. Nanocomposite samples with different gold content have been synthesized and studied with respect to their structure, size and shape of nanocrystals, thermal behavior, surface characteristics and optical properties, as well as their photocatalytic activity. We have found that modification of nanocrystalline ZnO with gold nanocrystals strongly influences the porosity of nanocomposites -less micro-and mesopores are formed, which results in a reduced specific surface area. The synthesized ZnO and Au/ZnO nanocrystals are active photocatalysts for the photocatalytic degradation of methylene blue (MB), as a model pollutant dye, in the UV region. There is a decrease in photocatalytic activity with an increase of the gold content in the nanocomposite photocatalyst. The degree of MB degradation obtained with a pure ZnO sample is comparable to that with the Au/ ZnO photocatalyst with the lowest gold content 0.05 at. %. New and interesting result has been obtained relating to maximum specific (intrinsic) photocatalytic activity of 0.05 at. % Au/ZnO nanocrystals.

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Section: Introductionmentioning

confidence: 99%

Novel starch-mediated synthesis of Au/ZnO nanocrystals and their photocatalytic properties

Peychev

Vasileva

2021

Heliyon

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“…The discovery of conductive polymers has led to new technology. When interesting properties of material are observed in the laboratory, efforts are made to understand their mechanisms, which lead to the fine control of the fabrication process of this new and potentially important material [1]. Conducting polymers have been a popular area of investigation because of their potential application areas.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Thermal Stability of Poly (O–phenylenediamine) (PoPD) by Thermogravimetric Analysis (TGA)

Juliana¹,

Chibuike²,

Josiah³

2019

AJN

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The poly (o-phenylenediamine) (PoPD) was synthesized from the monomer o-phenylenediamine in hydrochloric acid (HCl) using potassium dichromate as an oxidant by chemical oxidation method. The prepared PoPD sample was characterized by thermogravimetric analyzer (TGA) and scanning electron microscopy (SEM). The thermogravimetric analysis (TGA) results showed that a weight loss occurred. The weight loss as a result of the thermal energy applied to the polymer sample is 9.649mg which is 85.0% of the original polymer sample. The point of the greatest rate of change on the weight loss curve (point of inflection) is found to be 275°C and is the peak temperature of the degradation of the PoPD. SEM analysis showed that the PoPD sample has particle sizes ranging from 200µm-50µm at 360 magnification, 500µm-50µm at 1000 magnification, 200µm-50µm at 1550 magnification and 500µm-150µm at 2000 magnification which revealed more unevenly dispersed particles of the poly (o-phenylenediamine) polymer at different magnifications. Therefore poly (ophenylenediamine) has different particle sizes and is also thermally stable at a higher temperature of 150°C.

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“…Particle dopants can be of different shapes, such as spheri-cal [1,2,4], fiber-like [6], or flake-platelets and with dimensions from nano- [2,6,8] to micronsized particles [1,3,4]. These heterogeneous mixtures exhibit improvements in their properties compared to those of the neat polymer host in terms of mechanical, electrical, and thermal properties, tailoring them to a variety of applications [1,3,6,[9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Inorganic dopants in polymer cholesteric liquid crystals

Trajkovska

2015

Maced. J. Chem. Chem. Eng.

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A variety of dopants are used for different types of polymers to change their properties. Inorganic dopants are usually used to change the dielectric properties of the polymers. These compositions find different applications especially in electronic systems due to ease of polymer processing, increased functionality and low cost of novel materials that are with relatively high dielectric constant compared to the base polymer material.In this study, polymer cholesteric liquid crystal (PCLC) is used as a host material that is doped by different inorganic dopants, BaTiO3 and TiO2, all of them affected the dielectric constant of the polymer matrix. This is important from the fact that doped PCLC can be used for a variety of electro-optical applications, e.g. display applications and low energy consuming e-book application. The behaviour of inorganic dopants in PCLC is calculated by various existing mixing models; the best fit is observed by use of logarithmic equation.

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Doping of Polymers with ZnO Nanostructures for Optoelectronic and Sensor Applications

Cited by 6 publications

References 43 publications

Novel starch-mediated synthesis of Au/ZnO nanocrystals and their photocatalytic properties

Novel starch-mediated synthesis of Au/ZnO nanocrystals and their photocatalytic properties

Evaluation of the Thermal Stability of Poly (O–phenylenediamine) (PoPD) by Thermogravimetric Analysis (TGA)

Inorganic dopants in polymer cholesteric liquid crystals

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