scholarly journals Highly Luminescent Ternary Nanocomposite of Polyaniline, Silver Nanoparticles and Graphene Oxide Quantum Dots

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Azza Shokry ◽  
M. M. A. Khalil ◽  
Hesham Ibrahim ◽  
Moataz Soliman ◽  
Shaker Ebrahim
Keyword(s):  
Quantum Dots ◽  
Silver Nanoparticles ◽  
Graphene Oxide ◽  
Chemical Reduction ◽  
Oxidative Polymerization ◽  
Sensing Applications ◽  
Ternary Nanocomposite ◽  
Average Size ◽  
Graphene Oxide Quantum Dots ◽  
20 Nm

AbstractQuantum dots (QDs) with photostability show a potential application in optical sensing and biological imaging. In this work, ternary nanocomposite (NC) of high fluorescent polyaniline (PANI)/2-acrylamido-2-methylpropanesulfonic acid (AMPSA) capped silver nanoparticles (NPs)/graphene oxide quantum dots (PANI/Ag (AMPSA)/GO QDs) have been synthesized by in situ chemical oxidative polymerization of aniline in the presence of Ag (AMPSA) NPs and GO QDs. Ag (AMPSA) NPs and GO QDs were prepared by AgNO3 chemical reduction and glucose carbonization methods, respectively. The prepared materials were characterized using UV-visible, Fourier transform infrared (FTIR), photoluminescence and Raman spectroscopies, X-Ray diffractometer (XRD) and high- resolution transmission electron microscopy (HRTEM). HRTEM micrographs confirmed the preparation of GO QDs with an average size of 15 nm and Ag (AMPSA) NPs with an average size of 20 nm. PANI/Ag (AMPSA)/GO QDs NC showed high and stable emission peak at 348 nm. This PANI/Ag (AMPSA)/GO QDs NC can emerge as a new class of fluorescence materials that could be suitable for practical sensing applications.

scholarly journals The development of a ternary nanocomposite for the removal of Cr(vi) ions from aqueous solutions

RSC Advances ◽  
2019 ◽  
Vol 9 (67) ◽  
pp. 39187-39200 ◽  
Author(s):  
Azza Shokry ◽  
Ayman El Tahan ◽  
Hesham Ibrahim ◽  
Moataz Soliman ◽  
Shaker Ebrahim
Keyword(s):  
Quantum Dots ◽  
Silver Nanoparticles ◽  
Graphene Oxide ◽  
Aqueous Solutions ◽  
Hexavalent Chromium ◽  
Polluted Water ◽  
Ternary Nanocomposite ◽  
Graphene Oxide Quantum Dots ◽  
Efficient Adsorbent

The aim is to develop a ternary nanocomposite of polyaniline/2-acrylamido-2-methylpropanesulfonic acid-capped silver nanoparticles/graphene oxide quantum dots as an efficient adsorbent for the removal of the highly toxic hexavalent chromium (Cr(vi)) from polluted water.

scholarly journals Antimicrobial activity of graphene oxide quantum dots: impacts of chemical reduction

2020 ◽  
Vol 2 (3) ◽  
pp. 1074-1083
Author(s):  
Mauricio D. Rojas-Andrade ◽  
Tuan Anh Nguyen ◽  
William P. Mistler ◽  
Juan Armas ◽  
Jia En Lu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Antimicrobial Activity ◽  
Graphene Oxide ◽  
Chemical Reduction ◽  
Differential Toxicity ◽  
Graphene Oxide Quantum Dots

The design and engineering of graphene-based nanomaterials for antimicrobial applications is attracting extensive interest. Here, we highlight the differential toxicity and phototoxicity of graphene oxide quantum dots after NaBH4 reduction.

Antimicrobial and Cytotoxic Activity of Silver Nanoparticles Stabilized by Natural Biopolymer Arabinogalactan

2020 ◽  
Vol 19 (04) ◽  
pp. 1950029
Author(s):  
A. G. Demchenko ◽  
V. S. Sadykova ◽  
A. V. Lyundup ◽  
N. E. Sedyakina ◽  
T. I. Gromovykh ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antifungal Activity ◽  
Cytotoxic Activity ◽  
Chemical Reduction ◽  
Antitumor Agent ◽  
Escherichia Coli Bacteria ◽  
Trichoderma Citrinoviride ◽  
Average Size ◽  
Antibacterial And Antifungal ◽  
Dose Dependent

Silver nanoparticles were synthesized by chemical reduction of silver nitrate using arabinogalactan polysaccharide as a reducing agent and a stabilizer. The average size of nanoparticles, obtained by analyzing TEM-images, was 10.8[Formula: see text]nm; zeta potential [Formula: see text][Formula: see text]mV. A study of the sol by electron diffraction showed that silver in the sample is in metallic form. The resulting preparation of silver nanoparticles showed both antibacterial and antifungal activity. A pronounced antibacterial activity of silver nanoparticles was demonstrated both in relation to conditionally pathogenic gram-positive (Bacillus subtilis and B. coagulans) and gram-negative (Escherichia coli) bacteria. Silver nanoparticles also possess antifungal activity against macromycete Fomitopsis sp., as well as two strains of micromycetes Trichoderma citrinoviride and Fusarium sporotrichioides. Using the methods of light and fluorescence microscopy, MTT-analysis and Real-time cell analysis, the cytotoxic activity of silver nanoparticles was investigated on HepG2 human hepatocellular carcinoma cells. It was demonstrated that nanoparticles cause a suppression of cell metabolic and proliferative activity, as well as dose-dependent induction of cell death (average relative EC[Formula: see text] value was [Formula: see text]g/ml). The preparation of silver nanoparticles stabilized by arabinogalactan can be used in medicine, as a potential antimicrobial and antitumor agent.

Heterogeneity in the fluorescence of graphene and graphene oxide quantum dots

2017 ◽  
Vol 184 (3) ◽  
pp. 871-878 ◽  
Author(s):  
Siobhan J. Bradley ◽  
Renee Kroon ◽  
Geoffry Laufersky ◽  
Magnus Röding ◽  
Renee V. Goreham ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Graphene Oxide Quantum Dots
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