A novel electrochemical comparative sensing interface of MgO nanoparticles synthesized by different methods

Recent advancements in nanotechnology, for the biosynthesis of metal nanoparticles through enormous techniques, showed multidimensional developments. One among many facets of nanotechnology is to procure and adopt new advancements for green technology over chemical reduction synthesis. This adaptation for acquiring green nanotechnology leads us to a new dimension of nanobiotechnology. In order to imply one such efforts, in this study the emphasis is being laid on the synthesis of MgO nanoparticles using green technology and eliminating chemical reduction methods. Different characterization techniques such as UV–Vis spectroscopy, transmission electron microscopy, and dynamic light scattering were used to carry out the experiments. The average size of MgO nanoparticles were obtained in the range of 85–95 nm, when synthesized by various sources. The extracts of plants were capable of producing MgO nanoparticles efficiently and exhibited good results during cyclic voltammetry and electrochemical impedance spectroscopy study. The electrode modified with MgO nanoparticles (plant extract) showed good stability (90 days) and high conductivity. This study reports cost-effective and environment-friendly method for synthesis of MgO nanoparticles using plant extracts. The process is rapid, simple, and convenient and can be used as an alternative to chemical method.

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Green Synthesis of Silver Nanoparticles Using Astragalus tribuloides Delile. Root Extract: Characterization, Antioxidant, Antibacterial, and Anti-Inflammatory Activities

Nanomaterials ◽

10.3390/nano10122383 ◽

2020 ◽

Vol 10 (12) ◽

pp. 2383

Author(s):

Majid Sharifi-Rad ◽

Pawel Pohl ◽

Francesco Epifano ◽

José M. Álvarez-Suarez

Keyword(s):

Silver Nanoparticles ◽

Green Synthesis ◽

Total Phenolics ◽

Cost Effective ◽

Root Extract ◽

Transmission Electron ◽

Vis Spectroscopy ◽

High Efficient ◽

Anti Inflammatory ◽

Average Size

Today, the green synthesis of metal nanoparticles is a promising strategy in material science and nanotechnology. In this research, silver nanoparticles (AgNPs) were synthesized through the high-efficient, cost-effective green and facile process, using the Astragalus tribuloides Delile. root extract as a bioreduction and capping agent at room temperature. UV–Vis spectroscopy was applied for the investigation of the reaction proceedings. To characterize the greenly synthesized AgNPs, Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction spectroscopy (XRD), and transmission electron microscopy (TEM) analyses were utilized. In addition, the total phenolics and flavonoids contents, antioxidant, antibacterial, and anti-inflammatory activities of the greenly synthesized AgNPs and the A. tribuloides root extract were evaluated. The results indicated that the AgNPs had spherical morphology and crystalline structure with the average size of 34.2 ± 8.0 nm. The total phenolics and flavonoids contents of the greenly synthesized AgNPs were lower than those for the A. tribuloides root extract. The resultant AgNPs exhibited the appropriate antioxidant activity (64%) as compared to that for the A. tribuloides root extract (47%). The antibacterial test approved the higher bactericidal activity of the resulting AgNPs on the Gram-positive and Gram-negative bacteria in comparison to the A. tribuloides root extract. Considering the anti-inflammatory activity, the greenly synthesized AgNPs showed a stranger effect than the A. tribuloides root extract (82% versus 69% at 500 μg/mL). Generally, the AgNPs that were fabricated by using the A. tribuloides root extract had appropriate antioxidant, antibacterial, and anti-inflammatory activities and, therefore, can be considered as a promising candidate for various biomedical applications.

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Facile synthesis of water-soluble graphene-based composite: Non-covalently functionalized with chitosan-ionic liquid conjugation

Functional Materials Letters ◽

10.1142/s1793604716500454 ◽

2016 ◽

Vol 09 (03) ◽

pp. 1650045 ◽

Cited By ~ 7

Author(s):

Pei-Ying Li ◽

Kai-Yu Cheng ◽

Xiu-Cheng Zheng ◽

Pu Liu ◽

Xiu-Juan Xu

Keyword(s):

Electron Microscopy ◽

Ionic Liquid ◽

Chemical Reduction ◽

Water Soluble ◽

X Ray Diffraction ◽

Facile Synthesis ◽

X Ray ◽

Transmission Electron ◽

Vis Spectroscopy ◽

Text Interaction

Chitosan-ionic liquid conjugation (CILC), which was prepared through the reaction of 1-(4-bromobutyl)-3-methylimidazolium bromide (BBMIB) with chitosan, was firstly used to prepare functionalized graphene composite via the chemical reduction of graphene oxide (GO). The obtained water soluble graphene-based composite was characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), ultraviolet-visible (UV–Vis) spectroscopy and so on. CILC-RGO showed excellent dispersion stability in water at the concentration of 2.0 mg/mL, which was stable for several months without any precipitate. This may be ascribed to the electrostatic attraction and [Formula: see text]–[Formula: see text] interaction between CILC and graphene.

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Green Synthesis of Silver Nanoparticles Using Aqueous Floral Extract of Nelumbo Nucifera

Materials Science Forum ◽

10.4028/www.scientific.net/msf.756.106 ◽

2013 ◽

Vol 756 ◽

pp. 106-111 ◽

Cited By ~ 3

Author(s):

Selvaraj Arokiyaraj ◽

Udaya Prakash Nyayiru Kannaian ◽

Vijay Elakkya ◽

T. Kamala ◽

S. Bhuvaneswari ◽

...

Keyword(s):

Silver Nanoparticles ◽

Green Synthesis ◽

Chemical Reduction ◽

Colour Change ◽

Cost Effective ◽

Nelumbo Nucifera ◽

Resonance Band ◽

Afm Analysis ◽

Reduction Methods ◽

Physical And Chemical

The aim of the present study is to synthesize silver nanoparticles, using an aqueous floral extract of common Lotus, i.e Nelumbo nucifera. The synthesized nanoparticles were characterized using UV, TEM, EDX, AFM & XRD. The synthesized AgNPs were confirmed due to the colour change from colourless to reddish brown just after the addition of the aqueous floral extract of Nelumbo nucifera. The UV results of AgNPs showed the excitation of surface Plasmon resonance band at 427 nm. TEM results showed that the synthesized AgNPs were uniformed; monodispersed,spherical in shape and the particle size were found to be 77.81 ± 3.54 nm. EDX spectrum of AgNPs confirms strong signals from Ag (64%) and other elements such as C, O and Cl. The morphology of the synthesized AgNPs by AFM analysis resembled the TEM micrograph. The crystalline nature of the AgNPs was confirmed by XRD. The present study concludes that the aqueous floral extract of Nelumbo nucifera could be used as an effective reducing agent for the synthesis of AgNP. The green synthesis ofsilver nanoparticles is non-toxic and cost-effective and thus remains to be an alternative method to other physical and chemical reduction methods.

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Bactericidal Silver Nanoparticles by Atmospheric Pressure Solution Plasma Processing

Nanomaterials ◽

10.3390/nano10050874 ◽

2020 ◽

Vol 10 (5) ◽

pp. 874 ◽

Cited By ~ 3

Author(s):

Janith Weerasinghe ◽

Wenshao Li ◽

Rusen Zhou ◽

Renwu Zhou ◽

Alexander Gissibl ◽

...

Keyword(s):

Silver Nanoparticles ◽

Atmospheric Pressure ◽

Chemical Reduction ◽

Cost Effective ◽

Pressure Solution ◽

Gram Negative Bacteria ◽

Promising Alternative ◽

Gram Negative ◽

Transmission Electron ◽

Solution Plasma Processing

Silver nanoparticles have applications in plasmonics, medicine, catalysis and electronics. We report a simple, cost-effective, facile and reproducible technique to synthesise silver nanoparticles via plasma-induced non-equilibrium liquid chemistry with the absence of a chemical reducing agent. Silver nanoparticles with tuneable sizes from 5.4 to 17.8 nm are synthesised and characterised using Transmission Electron Microscopy (TEM) and other analytic techniques. A mechanism for silver nanoparticle formation is also proposed. The antibacterial activity of the silver nanoparticles was investigated with gram-positive and gram-negative bacteria. The inhibition of both bacteria types was observed. This is a promising alternative method for the instant synthesis of silver nanoparticles, instead of the conventional chemical reduction route, for numerous applications.

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Optimization of biogenic synthesis of silver nanoparticles from flavonoid-rich Clinacanthus nutans leaf and stem aqueous extracts

Royal Society Open Science ◽

10.1098/rsos.200065 ◽

2020 ◽

Vol 7 (7) ◽

pp. 200065 ◽

Cited By ~ 1

Author(s):

Siti Nur Aishah Mat Yusuf ◽

Che Nurul Azieyan Che Mood ◽

Nor Hazwani Ahmad ◽

Doblin Sandai ◽

Chee Keong Lee ◽

...

Keyword(s):

Silver Nanoparticles ◽

Functional Groups ◽

Silver Ions ◽

Cost Effective ◽

Aqueous Extracts ◽

Tem Analysis ◽

Transmission Electron ◽

Vis Spectroscopy ◽

The Face ◽

Clinacanthus Nutans

Background : Silver nanoparticles (AgNPs) are widely used in food industries, biomedical, dentistry, catalysis, diagnostic biological probes and sensors. The use of plant extract for AgNPs synthesis eliminates the process of maintaining cell culture and the process could be scaled up under a non-aseptic environment. The purpose of this study is to determine the classes of phytochemicals, to biosynthesize and characterize the AgNPs using Clinacanthus nutans leaf and stem extracts. In this study, AgNPs were synthesized from the aqueous extracts of C. nutans leaves and stems through a non-toxic, cost-effective and eco-friendly method. Results : The formation of AgNPs was confirmed by UV-Vis spectroscopy, and the size of AgNP-L (leaf) and AgNP-S (stem) were 114.7 and 129.9 nm, respectively. Transmission electron microscopy (TEM) analysis showed spherical nanoparticles with AgNP-L and AgNP-S ranging from 10 to 300 nm and 10 to 180 nm, with average of 101.18 and 75.38 nm, respectively. The zeta potentials of AgNP-L and AgNP-S were recorded at −42.8 and −43.9 mV. X-ray diffraction analysis matched the face-centred cubic structure of silver and was capped with bioactive compounds. Fourier transform infrared spectrophotometer analysis revealed the presence of few functional groups of phenolic and flavonoid compounds. These functional groups act as reducing agents in AgNPs synthesis. Conclusion : These results showed that the biogenically synthesized nanoparticles reduced silver ions to silver nanoparticles in aqueous condition and the AgNPs formed were stable and less toxic.

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One-Pot Hydrothermal Synthesis of Sulfur-Doped SnO2 Nanoparticles and their Enhanced Photocatalytic Properties

NANO ◽

10.1142/s1793292016500351 ◽

2016 ◽

Vol 11 (03) ◽

pp. 1650035 ◽

Cited By ~ 6

Author(s):

Lin Ma ◽

Limei Xu ◽

Xuyao Xu ◽

Xiaoping Zhou ◽

Lingling Zhang

Keyword(s):

Visible Light ◽

Photoelectron Spectroscopy ◽

Electrochemical Impedance ◽

Sno2 Nanoparticles ◽

Light Response ◽

One Pot ◽

X Ray ◽

Transmission Electron ◽

Light Region ◽

Vis Spectroscopy

Sulfur-doped SnO2 nanoparticles with ultrafine sizes have been successfully prepared by a one-pot hydrothermal method. The obtained samples are characterized by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), high resolution transmission electron microscopy (HRTEM), thermogravimetric (TG), analyzer UV-Vis spectroscopy, photoluminescence (PL) and electrochemical impedance spectroscopy (EIS). The experimental results indicate that the doping level of sulfur element as well as the bandgaps of SnO2 can be controlled to a certain extent by varying the amount of L-cysteine (L-cys). When evaluated as photocatalysts in the degradation of rhodamine B (RhB) and reduction of Cr(VI) under visible light region, the resultant sulfur-doped SnO2 nanoparticles demonstrate obviously enhanced photocatalytic activities due to the markedly improved visible light response and effective separation of the photo-generated electron–hole pairs.

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Ultrasound-assisted green synthesis of silver nanoparticles and their incorporation in antibacterial cellulose packaging

Green Processing and Synthesis ◽

10.1515/gps-2014-0085 ◽

2015 ◽

Vol 4 (2) ◽

Cited By ~ 2

Author(s):

Vladimir Popov ◽

Ivaylo Hinkov ◽

Svetlomir Diankov ◽

Maria Karsheva ◽

Yordan Handzhiyski

Keyword(s):

Antimicrobial Activity ◽

Silver Nanoparticles ◽

Surface Area ◽

Reduction Method ◽

Cost Effective ◽

Antimicrobial Efficiency ◽

Transmission Electron ◽

Vis Spectroscopy ◽

Ultrasound Assisted ◽

Strong Antimicrobial Activity

AbstractThe antimicrobial activity of nanoparticles (NPs) depends of the surface area in contact with microorganisms. The large surface area of the nanoparticles enhances their interaction with the microbes. In this work, a green, simple, rapid, and efficient ultrasound-assisted reduction method for silver nanoparticles (AgNP) synthesis is presented. For the synthesis, an aqueous solution of silver nitrate, ethanol, and ammonia was used. The adopted method can be easily implemented for any kind of scientific or industrial application due to its cost-effective nature. The effect of sonication time on the nanoparticle formation was investigated. Silver nanoparticles were analyzed through transmission electron microscopy and UV-vis spectroscopy. Antimicrobial additives can be incorporated in mass in different matrixes (polymeric or cellulosic), which is a convenient methodology to achieve antimicrobial activity. In this work, silver nanoparticles were incorporated in cellulose using an ultrasonic bath technique. The most important aspect of cellulose containing silver nanoparticles prepared by this method is its high antimicrobial efficiency. The microbiological study was carried out by a standard agar technique. The analysis showed that cellulose with incorporated silver nanoparticles exhibited strong antimicrobial activity against

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A Facile and TGA Free Hydrothermal Synthesis of SnS Nanoparticles

NANO ◽

10.1142/s179329201750120x ◽

2017 ◽

Vol 12 (10) ◽

pp. 1750120 ◽

Cited By ~ 3

Author(s):

M. Gurubhaskar ◽

Narayana Thota ◽

M. Raghavender ◽

Y. P. Venkata Subbaiah ◽

G. Hema Chandra ◽

...

Keyword(s):

Electron Microscopy ◽

Reaction Temperature ◽

Life Time ◽

Cost Effective ◽

Dual Band ◽

X Ray Diffraction ◽

Chloride Dihydrate ◽

Transmission Electron ◽

Absorber Material ◽

Vis Spectroscopy

In this paper, we employed a simple and cost-effective thioglycolic acid (TGA) free hydrothermal method, based on thiourea hydrolysis of stannous chloride dihydrate [SnCl2.2H2O] at 160[Formula: see text]C–190[Formula: see text]C for 6[Formula: see text]h, for the synthesis of SnS nanoparticles. The effect of hydrothermal autoclave reaction temperature on various properties of SnS nanoparticles have been examined at length using X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), field-emission scanning electron microscopy attached with EDAX (FE-SEM), transmission electron microscopy (TEM) and ultraviolet-visible (UV-Vis) spectroscopy. The results suggest that the crystallization of orthorhombic SnS nanoparticles, with size varying from 3[Formula: see text]nm to 5[Formula: see text]nm, formed at R[Formula: see text]C. Further, the formation of SnS phase was confirmed by an IR Sn-S characteristic bands around 2350[Formula: see text]cm[Formula: see text], 1041[Formula: see text]cm[Formula: see text] and 570[Formula: see text]cm[Formula: see text], and four distinguished Raman peaks at 95[Formula: see text]cm[Formula: see text], 160[Formula: see text]cm[Formula: see text], 189[Formula: see text]cm[Formula: see text] and 220[Formula: see text]cm[Formula: see text]. The mechanism for the formation of SnS nanoparticles have been proposed and discussed. The SnS nanoparticles have exhibited reaction temperature dependent morphological features like nanoflowers, nanoflakes, spherical nanoparticles and nanogranules. The absorbance studies indicated both strong direct and weak indirect allowed transitions for SnS nanoparticles and the associated band gaps were found to be 1.5[Formula: see text]eV and 1.19[Formula: see text]eV, respectively. The dual band gap combination of SnS would favor strong direct absorption of carriers and improved minority carrier life time due to indirect nature, which means the grown particles are suitable for ideal absorber material for solar cell applications.

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A COST-EFFECTIVE MAGNETIC PHOTOCATALYST PALYGORSKITE–TiO2–FexOy WITH EXCELLENT PERFORMANCE FOR DYE PHOTODEGRADATION UNDER VISIBLE LIGHT

NANO ◽

10.1142/s1793292014500635 ◽

2014 ◽

Vol 09 (06) ◽

pp. 1450063

Author(s):

JIAHUI ZHANG ◽

LILI ZHANG ◽

JIN HUANG ◽

SHOUYONG ZHOU ◽

HAIQUN CHEN ◽

...

Keyword(s):

Visible Light ◽

Photoelectron Spectroscopy ◽

Cost Effective ◽

Magnetic Photocatalyst ◽

X Ray ◽

Transmission Electron ◽

Light Region ◽

Reaction Solution ◽

Excellent Photocatalytic Activity ◽

Average Size

Palygorskite (denoted as Pal) was used as an economical carrier of hybrid photocatalyst TiO 2– Fe x O yvia an in situ depositing technique (marked as Pal– TiO 2– Fe x O y). The samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), brunner-emmet-teller (BET) measurements, X-ray photoelectron spectroscopy (XPS) and UV-Vis diffuse reflectance spectra measurements. Results showed that TiO 2– Fe x O y composite particles with average size of about 10 nm were loaded onto the Pal fibers' surface. Fe x O y acted not only as magnetic source but also took part in the formation of TiO 2– Fe x O y heterojunction structure, which resulted in the obvious absorption in visible light region for the obtained Pal– TiO 2– Fe x O y composite photocatalyst. The obtained Pal– TiO 2– Fe x O y shows excellent photocatalytic activity toward photodegradation of Methyl orange (MO) under visible light irradiation and the degradation ratio reached 94% within 180 min. Moreover, Pal– TiO 2– Fe x O y could be readily recovered from the reaction solution by the magnet. Possible mechanism for the enhancement was also proposed.

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Preparation and characterization of highly blue emitting fluorescent carbon nano-dots using Pongammia pinnata fresh leaves

10.21203/rs.3.rs-874336/v1 ◽

2021 ◽

Author(s):

Govindaraju K ◽

K. Vijai Anand ◽

S. Muthamilselvan ◽

M. Kannan ◽

M. Elanchezhiyan

Keyword(s):

Electron Microscopy ◽

Water Soluble ◽

Hydrothermal Technique ◽

Transmission Electron ◽

Vis Spectroscopy ◽

Ft Ir ◽

Average Size ◽

Soluble Carbon ◽

Ft Ir Spectroscopy

Abstract In this study, a simple environmental benign approach have been adopted for the preparation of highly luminescent (blue emitting) water soluble carbon nano-dots using Pongammia pinnata (Pp) leaves via hydrothermal technique. The prepared Pp-carbon nano- dots were characterized using UV-vis spectroscopy, fluorescence spectroscopy, Fourier transform infrared (FT-IR) spectroscopy, transmission electron microscopy (TEM) and dynamic light scattering (DLS) measurements. The Pp-carbon nano-dots are spherical in shape with an average size of 32 nm.

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