Ag-ZnO Nanocomposites Research Articles

Green synthesis of bimetallic Ag-ZnO nanocomposite using polyherbal extract for antibacterial and anti-inflammatory activity

The current research has involved to develop nanoparticles (NPs) of zinc oxide (ZnO) doped with silver (Ag) through an eco-friendly method. Eclipta prostrate (EP), Eclipta alba (EA), and Tridax procumbans (TP) are subjected to Soxhlet extraction using ethyl acetate. Alkaloids, flavonoids, and phenols were quantified using standard methods. Polyherbal extract was used to synthesize silver-zinc oxide nanocomposites (Ag-ZnO NCs) via the sol-gel method. The reduction of metal ions was confirmed by UV–visible spectroscopy, scanning electron microscopy, and thermogravimetric analysis. Polyherbal plants are found to have higher concentrations of phenols, flavonoids, and alkaloids than indigenous plants. Ag-ZnO NCs functional group has been identified using Fourier Transform Infrared Spectroscopy (FTIR) spectroscopy. UV–vis spectroscopy revealed the surface plasmon resonance (SPR) of silver nanoparticles at 463–477 nm and zinc oxide nanoparticles at 266–267 nm. For Ag-ZnO NCs, the SPR peak was observed at 450 nm. Scanning electron microscopy confirmed the spherical morphology of the Ag-ZnO NCs. The anti-microbial activity of the formulated Ag-ZnO NCs was more effective than the extract against all tested pathogens. The most effective antimicrobial activities are achieved for Ag-ZnO NCs at 50 µg and 200 µg for extract. Biosynthesized nanoparticles exhibit a significant anti-inflammatory effect of 68% at a low concentration of 500 µg/mL, greater than the efficacy of diclofenac sodium. Additionally, the synthesized Ag-ZnO nanoparticle demonstrated its stability for 90 days and showed strong antimicrobial properties.

Clove mediated synthesis of Ag-ZnO doped fucoidan nanocomposites and their evaluation of antibacterial, antioxidant and cytotoxicity efficacy study

The Ag-ZnO/Fu nanocomposites were successfully synthesized in an environmentally friendly manner using an aqueous Clove buds extract from the Syzygium aromaticum plant. They were then examined for antibacterial activity against bacterium strains of Escherichia coli, Methicillin-resistant Staphylococcus aureus (MRSA), Pseudomonas aeruginosa, and Enterococcus faecalis. The UV–Visible spectrophotometry analysis confirmed the presence of zinc oxide (ZnO) nanoparticles at 334 nm, silver oxide (Ag) nanoparticles at 416 nm, and fucoidan at 589 nm in the synthesized nanocomposites. The FT-IR analysis confirmed the presence of five different functional linkages in the synthesized nanocomposites. The positions of diffraction peaks in pure Ag-ZnO/Fu nanocomposite patterns were identified using XRD analysis. The Ag-ZnO/Fu nanocomposites synthesized are more crystalline (77 %), and less amorphous (22.2 %). Silver, O, and Zn signals were detected in the SEM and EDX spectra of the Ag-ZnO/Fu nanocomposite. Different strains of Ag-ZnO/Fu nanocomposites showed stronger antibacterial properties. The DPPH technique was used to perform the antioxidant assay. Cytotoxicity testing was carried out on zebrafish embryos treated with several groups of Clove Ag ZnO/Fucoidan. The combination Ag-ZnO/Fucoidan (300 mg/mL) showed a marginally significant difference in survival (94 %).

Larvicidal, bactericidal, antioxidant, hypoglycemic effects and anti-proliferative activity of phyto-synthesized Ag-ZnO nanocomposites using Eranthemum roseum (Vahl) R.Br. leaf extract against Aedes aegypti and Culex quinquefasciatus mosquito vectors

This research is conducted using zinc doped silver nanocomposite on Eranthemum roseum leaf extract. E. roseum has its own medicinal properties due its bioactive compounds. Silver and Zinc also has its own medicinal properties due to its microbial properties. Our work is aimed to combine nanoparticles with plant extract to explore the medicinal properties. The synthesized Ag-ZnO NCs is characterized using X-ray powder diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), Scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDAX) and Transmission Electron Microscopy (TEM) analysis. The XRD analysis confirms the crystal nature of the Ag-ZnO NCs. The average shape of the nanocomposite was obtained using SEM as spherical, EDAX analysis confirming the presence of Ag, Zn and Oxygen and TEM conforms the oval shape of nanoparticles Antibacterial activity shows highest level of activity against K. pneumoniae and B. subtilis. DPPH Activity of Ag-ZnO NCs highest inhibition of 52.56 % while the ABTS analysis of Ag-ZnO NCs shows 54.28 %. Hypoglycemic activity α-amylase and α- glucosidase assay of Ag-ZnO NCs obtained good activity with maximum level of inhibition 63 % and 60 %. Anti-proliferative assay shows good activity against cancer causing cells in HepG2 human liver cancer line with 67.11 %. Larvicidal potential of Ag-ZnO NCs recorded good mortality rate against Aedes aegypti and Culex quinquefasciatus. This study confirms the maximum activity of Ag-ZnO NCs and acts as Larvicidal, Anti-proliferative, Antioxidant, Hypoglycemic agents.

Fabrication and evaluation of ZnO–Ag nanocomposites exhibiting enhanced antibacterial properties and their potential applications

Fabrication and evaluation of ZnO–Ag nanocomposites exhibiting enhanced antibacterial properties and their potential applications

Revolutionary composites of silver and zinc oxide nanoparticles from Hardwickia binata: Unleashing their potent antioxidant and anticancer properties

In the present of the study, was utilized the leaf extract of H. binata to synthesize Ag-ZnO nanocomposites. The nanocomposites were characterized using various techniques, including UV, FTIR, XRD and SEM-EDX. Nanocomposites are known for their promising properties, such as mechanical, thermal, electrical and optical characteristics, which have attracted significant attention from both academia and industry, resulting in active research in various fields. The introduction of silver (Ag) into the nanocomposites enabled them to exhibit UV light absorption at 366 nm, while the presence of zinc confirmed the peak at 431 nm. XRD analysis was carried out to determine the crystal structure and composition of the materials. The antibacterial properties of the Ag-ZnO nanocomposites were evaluated using the disc diffusion method, revealing the highest inhibition against the bacteria strain Bacillus subtilis (19 mm) compared to other strains. Furthermore, the nanocomposites demonstrated strong antioxidant activity against DPPH (56%), ABTS (59%) and exhibited anti-inflammatory activity (62%). Additionally, the Ag-ZnO nanocomposites showed promising anti-cancer properties, as evidenced by their effectiveness against a skin cancer cell line (A431-69%). Moreover, the nanocomposites displayed significant photocatalytic activity, resulting in a 70% degradation rate. Overall, this study successfully synthesized Ag-ZnO nanocomposites that exhibited robust antibacterial, antioxidant, anti-inflammatory and anticancer properties. These findings suggest the potential application of these nanocomposites in cancer treatment and environmental studies, particularly in dye degradation.

Effect of Gas Flowrate on the Properties and Photocatalytic Activity of ZnO-Ag Nanocomposite Materials Prepared by Flame Pyrolysis

It is well known that adding the appropriate amount of Ag to semiconductor materials can enhance photocatalytic performance. In our previous study, the addition of Ag nanoparticles to ZnO enhanced the photocatalytic activity. The best photocatalytic performance was obtained when Ag content was 5 wt%. However, the effect of a carrier gas flow rate has not been investigated. The objective of this study is to investigate the effect of carrier gas flow rate on the morphology of the ZnO-Ag nanocomposites as well as the photocatalytic activity of the produced nanocomposites. ZnO-Ag nanocomposite was fabricated by a one-step process using flame pyrolysis and the produced nanocomposites were characterized by a scanning electron microscope (SEM) and X-Ray Diffraction (XRD) analysis. The photocatalytic performance was evaluated by measuring the degradation of methylene blue under UV light irradiation. SEM images indicated that the morphology of ZnO-Ag nanocomposites has a spherical shape with a particle diameter of around 65 nm. Moreover, increasing the flow rate will increase the particle size of the produced nanocomposites. The photocatalytic test was determined based on the rate constant of MB degradation efficiency under UV light irradiation, where the photocatalytic activity decreased when the carrier gas increased. Finally, the produced nanocomposites were also tested several times (recycling test), where photocatalytic performance showed that the degradation value of methylene blue for each recycle did not vary much with the variable before being recycled.

Eco-friendly Synthesis of γ-Fe2 O3–Ag–ZnO Nanocomposite with Antibacterial and RhB Dye Degradation Properties Using Leaf Extract

In this study, the photocatalytic degradation of RhB dye in an aqueous solution using ZnO nanoparticles (NPs), [Formula: see text]-Fe2O3, [Formula: see text]-Fe2O3–ZnO, Ag–ZnO, and [Formula: see text]-Fe2O3–Ag–ZnO nanomaterials generated using poinciana leaf extract is presented. The nanomaterials were prepared utilizing environmentally friendly methods and poinciana leaf extract. The properties of the originally generated nanomaterials, analyzed through techniques such as atomic force microscopy (AFM), UV–visible spectroscopy, X-ray, electron microscopy, and FE-SEM, have been described. The hexagonal structure of ZnO wurtzite was also discovered to align with the XRD findings. Additionally, EDX mapping was employed to analyze the composition of the [Formula: see text]-Fe2O3–Ag–ZnO nanocomposite. A topological investigation confirmed the roughness of the created nanostructures. Regarding the photocatalytic Rhodamine B (RhB) dye degradation studies, the [Formula: see text]-Fe2O3–Ag–ZnO nanocomposite demonstrated superior performance compared to pure ZnO in breaking down dye molecules under visible light exposure. Employing an ideal configuration of 1.0 g/L of photocatalyst, pH 10, and 10 ppm of RhB, an impressive photodegradation effectiveness of nearly 99% was achieved in just 45 min of light exposure. An analysis of reactive species was conducted to determine the photodegradation efficiency of [Formula: see text]-Fe2O3–Ag–ZnO. To investigate the impact of the microorganisms Escherichia coli and Staphylococcus aureus on the [Formula: see text]-Fe2O3–Ag–ZnO nanocomposite, the results indicated that the [Formula: see text]-Fe2O3–Ag–ZnO nanocomposite achieved a high rate of success in neutralizing and eradicating these bacteria.

Synthesis of ZnO–Ag Nanocomposites by Thermal Decomposition Method and Studies on their Antibacterial Activity Against E. coli and S. aureus

Synthesis of ZnO–Ag Nanocomposites by Thermal Decomposition Method and Studies on their Antibacterial Activity Against E. coli and S. aureus

Eco-Friendly Synthesis of Ag-ZnO Nanocomposite Using Aloe-vera, Hibiscus Sabdariffa Plants and Their Antibacterial and Anti-fungi Activities

The current study used extracts from the aloe vera (AV) plant and the hibiscus sabdariffa flower to make Ag-ZnO nanoparticles (NPs) and Ag-ZnO nanocomposites (NCs). Ag/ZnO NCs were compared to Ag NPs and ZnO NPs. They exhibited unique properties against bacteria and fungi that aren't present in either of the individual parts. The Ag-ZnO NCs from AV showed the best performance against E. coli, with an inhibition zone of up to 27 mm, compared to the other samples. The maximum absorbance peaks were observed at 431 nm and 410 nm for Ag NPs, at 374 nm and 377 nm for ZnO NPs and at 384 nm and 391 nm for Ag-ZnO NCs using AV leaf extract and hibiscus sabdariffa flower extract, respectively. Using field emission-scanning electron microscopes (FE-SEM), the green synthesis of the shown NPs and NCs was found. The Ag NPs particle sizes ranged from 16.99 to 26.39 nm for AV and from 13.11 to 29.50 nm for hibiscus sabdariffa flowers, respectively. The particle size of ZnO NPs ranged from 23.04 to 32.58 nm and from 37.99 to 79.59 nm via AV and hibiscus sabdariffa flowers, respectively. Finally, the particle size of the Ag/ZnO nanocomposite ranged from 22.39–40.05 nm and from 59.73–87.05 nm via the AV and hibiscus sabdariffa flowers, respectively.

Facile biosynthesis of Ag–ZnO nanocomposites using Launaea cornuta leaf extract and their antimicrobial activity

The quest to synthesize safe, non-hazardous Ag–ZnO nanoomposites (NCs) with improved physical and chemical properties has necessitated green synthesis approaches. In this research, Launaea cornuta leaf extract was proposed for the green synthesis of Ag–ZnO NCs, wherein the leaf extract was used as a reducing and capping agent. The antibacterial activity of the prepared nanoomposites was investigated against Escherichia coli and Staphylococcus aureus through the disc diffusion method. The influence of the synthesis temperature, pH, and precursor concentration on the synthesis of the Ag–ZnO NCs and antimicrobial efficacy were investigated. The nanoparticles were characterized by ATR-FTIR, XRD, UV–Vis, FESEM, and TEM. The FTIR results indicated the presence of secondary metabolites in Launaea cornuta which assisted the green synthesis of the nanoparticles. The XRD results confirmed the successful synthesis of crystalline Ag–ZnO NCs with an average particle size of 21.51 nm. The SEM and TEM images indicated the synthesized nanoparticles to be spherical in shape. The optimum synthesis conditions for Ag–ZnO NCs were at 70 °C, pH of 7, and 8% silver. Antibacterial activity results show Ag–ZnO NCs to have higher microbial inhibition on E. coli than on S. aureus with the zones of inhibition of 21 ± 1.08 and 19.67 ± 0.47 mm, respectively. Therefore, the results suggest that Launaea cornuta leaf extract can be used for the synthesis of Ag–ZnO NCs.

Black Phosphorus-Based ZnO-Ag Nanocomposite for Antibacterial Activity against Tigecycline-Resistant Acinetobacter baumannii

Acinetobacter baumannii is a critically hard-to-treat gram-negative pathogen responsible for a range of infectious diseases. Tigecycline is a last-resort antibiotic for A. baumannii infection; however, tigecycline-resistant (TIG-R) A. baumannii has been increasingly reported. Therefore, new strategies must be developed to treat these detrimental infections. Nanoantibiotics composed of two-dimensional (2D) black phosphorus (BP) and its derived nanocomposites have emerged as excellent alternatives to current antibiotics. However, the development of unique materials to target specific pathogens is challenging. Here, we report the preparation of a BP-based ZnO-Ag (ZPBA) nanocomposite. A low-temperature solution synthesis method was used to prepare ZnO and Ag nanoparticles immobilized on BP nanosheets. X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy were used to characterize the ZPBA nanocomposite. The antibacterial activity of ZPBA nanocomposite was assessed by determining its minimum inhibitory concentration against type (ATCC 19606, ATCC 15150) and TIG-R (ATCC 19606-R) A. baumannii strains. From the assays, ZPBA showed superior activity against TIG-R A. baumannii strain with MIC of 12.5 µg·mL−1 compared to all other prepared samples. Finally, the combination of bacterial membrane disruption and ROS generation was demonstrated to be a potential antibacterial mechanism of ZPBA. Our results show that ZPBA could be a potential nanoantibiotic platform for eradicating TIG-R A. baumannii.

Eco-Friendly Green Synthesis and Photocatalyst Activity of Ag-ZnO Nanocomposite

The study successfully synthesized Ag NPs, ZnO NPs, and Ag/ZnO nanocomposites using an easy, cost effect and sustainable green synthetic approach. The purpose of synthesizing Ag/ZnO nanocomposites using two different plant extracts was to study their photo-degradation activity on Methylene Blue (MB) dye. (XRD) diffraction analysis confirmed the presence of Ag crystalline size and the wurtzite hexagonal structure of ZnO. (FE-SEM) results indicated spherical, nanorods and there is Clustering of NPs with an irregular shape. The resulting metal/semiconductor oxide nanocomposites possessed unique photo degradation characteristics that were absent in the individual Ag NPs and ZnO NPs.

Comparative study of zinc oxide nanocomposites with different noble metals synthesized by biological method for photocatalytic disinfection of Escherichia coli present in hospital wastewater.

Binary zinc oxide (ZnO) nanocomposites with different noble metals, silver (Ag) and ruthenium (Ru), were prepared from an aqueous leaf extract of Callistemon viminalis. The biosynthesized photocatalysts were characterized and examined for their photocatalytic disinfection against Escherichia coli isolated from hospital wastewater. The influence of the different noble metals showed a difference in physicochemical characteristics and photocatalytic efficiency between Ag-ZnO and Ru-ZnO. The photocatalytic degradation of methylene blue and photocatalytic disinfection were found to be in the order Ag-ZnO > Ru-ZnO > ZnO. The photocatalytic disinfection of Ag-ZnO reached a 75% reduction in 60 min, compared to 34 and 9% reductions of Ru-ZnO and ZnO, respectively. The kinetic reaction rate for the photocatalytic disinfection of Ag-ZnO was found to be 2.8 times higher than that of Ru-ZnO. The outstanding photocatalytic activity of Ag-ZnO over Ru-ZnO was attributed to higher crystallinity, greater UVA adsorption capacity, smaller particle size, and the additional antimicrobial effect of Ag itself. The C. viminalis-mediated Ag-ZnO nanocomposites can be a potential candidate for photocatalytic disinfection of drug-resistant E. coli in hospital wastewater.

Investigation of Antibacterial Activity of Ag-CuO and Ag-ZnO Nanocomposites synthesized by Chemical Precipitation Method

In this present study, the synthesis of Ag-CuO and Ag-ZnO nanocomposites has been conducted. The individual Ag-CuO and Ag-ZnO nanocomposites were synthesized by using chemical precipitation method. The resulting particles were characterized by using UV-Visible, FTIR, XRD and SEM. The optical properties and band gap measurements were explored by UV-Visible spectroscopy. FTIR spectrum of the prepared nanocomposite revealed the presence of vibrational modes which were related to the Cu-O, Zn-O. The XRD analysis confirmed the structural purity of synthesized nanocomposites and the estimated crystallite size is 31.93 nm and 26.62 nm for Ag-CuO and Ag-ZnO nanocomposites respectively. The morphological features were explored by SEM analysis with deposition of Ag nanoparticles on the surface of metal oxide nanoparticles. The antibacterial activities of synthesized nanocomposites were tested on bacteria strains such as Escherichia coli (Gram -ve) and Staphylococcus aureus (Gram +ve) respectively through well diffusion method. The synthesized nanocomposite shows the higher efficacy against E.coli with an average diameter size of 17 mm zone of inhibition. This result suggests that Ag-CuO and Ag-ZnO nanocomposites can be used effectively against microbial growth. Therefore, the synthesized nanocomposite may be promising for the antibacterial agent in pharmaceutical applications.

Development of a novel flexible thin PWO(Er)/ZnO(Ag) nanocomposite for ionizing radiation sensing

Radiation dosimetry is an essential aspect of modern radiotherapy. Optically stimulated luminescence (OSL) dosimetry is a promising technique that uses materials to measure radiation doses. However, current OSL dosimeters are limited in their ability to provide comprehensive validation of spatial dose distributions, particularly in flexibility radiation sensitivity. In this regard, a novel flexible PWO(Er)/ZnO(Ag) nanocomposite sensor has been developed by a solvothermal procedure and its ionization radiation responses were investigated under UV, proton, laser 980 nm, and 241Am sources. The calculated alpha detection efficiency showed that the prepared PWO(Er)/ZnO(Ag) sensor is highly sensitive to alpha radiation (99.6 %) with good stability/repeatability and linear response. According to the Photo/Ionoluminescence study, the doped dual nanocomposite sample showed the strongest blue, green, and yellow emissions at room temperature compared with pure and single doped samples with an exciton lifetime of τ = 143.30 ±0.07 μs. The XRD, FTIR, Raman, and EDX results indicated that the prepared pure and doped nanocomposites have two-phase compositions of PWO and ZnO and related chemical compounds/elements in the nanocomposite structure. The morphologies of the PWO and PWO(Er) nanoparticles (NPs) were mostly cubic and heterogeneous with average particle sizes of 125 and 82 nm. ZnO and ZnO(Ag) had hexagonal, spherical, and rod-shaped particles with typical particle diameters of 130 and 90 nm, respectively. Our results indicate the prepared luminescent nanocomposites are transparent, flexible, highly stable, highly sensitive to ionizing radiation, and have the potential for practical use in optoelectronics and medical imaging in the future.

Eco-Friendly Synthesis of Ag-ZnO Nanocomposite and its Anti-Bacterial Activity, Photocatalysis Toward Degradation of (CB) Dye and Removal Wastewater Pollution

The zinc oxide, silver particles and the nanocomposite Ag-ZnO were prepared in an easy, fast and environmentally friendly nanoscale method, where these nanomaterials were prepared from nitrates using plant leaf extract Albizia lebbeck, and this environmentally friendly method is safe, nontoxic and nonharmful to the environment, it is a system that is not only cost-effective, but also simple to use and efficient. The reduction reaction can regulate the features and qualities of the resultant chemicals. The researchers used a variety of methods to diagnose and investigate the properties of these nanomaterials, including scanning electron microscopy (FE-SEM), X-ray diffraction (XRD) and atomic force microscopy (AFM). The results showed the formation of zinc oxide and silver in the form of nanoparticles with good properties, as well as the formation of the nanocomposite Ag-ZnO, and element analysis EDX, and infrared FT-IR, and the results showed the formation of zinc oxide and silver in the form of nanoparticles with good properties, and the results also showed the growth of Ag particles on the surface of the reduced zinc oxide and formation of nanocomposite Ag-ZnO. The photocatalytic degradation of Cibacron Brilliant Yellow 3G-P (CB) dye in the presence of visible light was investigated using Ag-ZnO nanostructures as a photocatalyst. About 1[Formula: see text]g/L of Ag-ZnO with 20[Formula: see text]ppm of the dye produces a greater efficiency in the photocatalysis of the dye in its aqueous solution. The influence of the catalyst amount was explored within the quantities (0.2–0.4–0.6–0.8–1.0–1.2–1.4[Formula: see text]g/L) of the components affecting the photo-smashing process to evaluate the best weight which was 1(g). A photosynthesis ratio was calculated using HCL and NaOH to modify the pH of solutions at a concentration of 5[Formula: see text]ppm, [Formula: see text], 4, 6, 8 and 10. It was also discovered that the acidic function 10 was the best function for breaking down the dye with a 99.1% success rate, and that the shattering reaction followed the kinetics of the first order (Pseudo first), with five consecutive reuses of the best catalyst agents in breaking down the dye Ag-ZnO, was also investigated. After 120[Formula: see text]min, Ag doping ZnO with 10% loading showed photocatalytic elimination of about 93%. and the impact of Ag-ZnO nanocomposite on Staphylococcus aureus and Escherichia coli bacteria was investigated, which were utilized as illustrative examples of the cream-negative bacterium and the positive bacteria, respectively. The findings indicated that the Ag-ZnO nanocomposite had a high rate of success in eradicating and destroying these germs, demonstrating the viability of using a nanoscale solution to sanitize and eradicate microorganisms.

Antimicrobial activity of plant-extract-mediated synthesis of Silver-Zinc Oxide nanocomposites and their acaricidal efficacy on Hyalomma marginatum ticks

BackgroundNanocomposite materials have received a lot of attention recently, and interest at the academic and industrial levels because they have better qualities than single nanoparticles of metal, particularly the bio-fabricated type that is more environment-friendly. AimThe main goal of this investigation is to determine whether the leaf extract of Lawsonia inermis can be applied as a reducing and stabilizing material in the production of Ag-ZnO nanocomposite (NCs). Additionally, to investigate the probable biological actions of these Ag-ZnO-NCs. MethodologyAg-ZnO nanoparticles were synthesized using L. inermis leaves’ extract. The synthesized nanoparticles were characterised using an Emission-Scanning Electron Microscope (SEM), Energy-Dispersive X-ray spectroscopy and X-ray diffraction. Ag-ZnO-NCs were additionally evaluated for their acaricidal, antibacterial, and antifungal performance, and hemocompatibility properties. ResultsThe findings have proven that the Ag-ZnO-NCs were crystalline at the nanoscale with particle sizes between 20 and 160 nm. The Ag-ZnO-NCs revealed acaricidal activity against Hyalomma marginatum and showed effective antibacterial action as opposed to Escherichia coli, Pseudomonas aeruginosa, and Staphylococcus aureus, minimum inhibitory concentration (100 μg/ml). Moreover, The Ag-ZnO-NCs exhibited significant antifungal activity to Aspergillus flavus as well as A. niger. ConclusionThe present work pointed out that the L. inermis fresh leaf was an effective material for the fabrication of Ag-ZnO-NCs which showed critical biological potency and appeared hemocompatible.

Paper-Based Electrodes Decorated with Silver and Zinc Oxide Nanocomposite for Electro-Chemical Sensing of Methamphetamine

We present the development of an electrochemical paper-based analytical device (ePAD) for the detection of methamphetamine. Methamphetamine is a stimulant that young people use as an addictive narcotic, and it must be detected quickly since it may be hazardous. The suggested ePAD has the advantages of being simple, affordable, and recyclable. This ePAD was developed by immobilizing a methamphetamine-binding aptamer onto Ag-ZnO nanocomposite electrodes. The Ag-ZnO nanocomposites were synthesized via a chemical method and were further characterized via scanning electron microscopy, Fourier transform infrared spectroscopy, and UV-vis spectrometry in terms of their size, shape, and colloidal activity. The developed sensor showed a limit of detection of about 0.1 μg/mL, with an optimum response time of about 25 s, and its extensive linear range was between 0.01 and 6 μg/mL. The application of the sensor was recognized by spiking different beverages with methamphetamine. The developed sensor has a shelf life of about 30 days. This cost-effective and portable platform might prove to be highly successful in forensic diagnostic applications and will benefit those who cannot afford expensive medical tests.

Green synthesis of ZnO-Ag nanocomposite using Stenotaphrum secundatum grass extract: Antibacterial activity and anticancer effect in oral squamous cell carcinoma CAL 27 cells

Green synthesis of ZnO-Ag nanocomposite using Stenotaphrum secundatum grass extract: Antibacterial activity and anticancer effect in oral squamous cell carcinoma CAL 27 cells

Photodegradation of methylene blue by phytosynthesized Ag–ZnO nanocomposites

With the use of pomegranate (Punica granatum) peel extract in the present study, a safe and affordable method of biosynthesizing Ag–ZnO nanocomposites has been developed that follows all green chemistry principles. Different analytical techniques, including X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Energy Dispersive X-Ray (EDX), UV–Vis spectroscopy, and Fourier Transform Infrared (FTIR) Spectroscopy, were utilized to identify the unique properties of synthesized nanocomposites. Based on the characterization results, these nanocomposites have a spherical shape with dimensions ranging from 40 to 77 ​nm and a wurtzite structure with hexagonal facets. Considering the upcoming water crises and the importance of treating water contaminated with industrial and organic dyes, this study investigates how biosynthesized nanocomposites using ultraviolet lamps and sunlight can be used to remove one of the most common organic dyes, methylene blue. In order to identify the most optimal conditions for removing methylene blue from polluted water, this study used two light sources, different nanocatalyst concentrations, and various pH value ranging from 2 to 10. When the ideal conditions for this reaction are met, the prepared nanocomposites can catalyze the pollutant dye within 14 and 50 ​min, when exposed to ultraviolet light and sunlight. In this study, it was determined that plant wastes are biogenic sources capable of providing active ingredients (AI) for the biosynthesis of metal nanocomposites for applications such as decomposition and degradation of organic dyes.