scholarly journals Green and Economic Fabrication of Zinc Oxide (ZnO) Nanorods as a Broadband UV Blocker and Antimicrobial Agent

Nanomaterials ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 530 ◽  
Author(s):  
Seyedeh-Masoumeh Taghizadeh ◽  
Neha Lal ◽  
Alireza Ebrahiminezhad ◽  
Fatemeh Moeini ◽  
Mostafa Seifan ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Large Scale ◽  
Average Length ◽  
Zno Nanorods ◽  
Waste Product ◽  
Antibacterial Properties ◽  
Xrd Analysis ◽  
Controlled Synthesis ◽  
Vis Spectroscopy ◽  
Prepared Nanorods

Zinc oxide (ZnO) nanoparticles have gained widespread interest due to their unique properties, making them suitable for a range of applications. Several methods for their production are available, and of these, controlled synthesis techniques are particularly favourable. Large-scale culturing of Chlorella vulgaris produces secretory carbohydrates as a waste product, which have been shown to play an important role in directing the particle size and morphology of nanoparticles. In this investigation, ZnO nanorods were produced through a controlled synthesis approach using secretory carbohydrates from C. vulgaris, which presents a cost-effective and sustainable alternative to the existing techniques. Fourier transform infrared (FTIR) spectroscopy, X-ray powder diffraction (XRD) analysis, transmission electron microscopy (TEM), and UV-Vis spectroscopy were used to characterise the nanorods. The prepared nanorods exhibited a broad range of UV absorption, which suggests that the particles are a promising broadband sun blocker and are likely to be effective for the fabrication of sunscreens with protection against both UVB (290–320 nm) and UVA (320–400 nm) radiations. The antimicrobial activity of the prepared nanorods against Gram-positive and Gram-negative bacteria was also assessed. The nanostructures had a crystalline structure and rod-like appearance, with an average length and width of 150 nm and 21 nm, respectively. The nanorods also demonstrated notable antibacterial activity, and 250 μg/mL was determined to be the most effective concentration. The antibacterial properties of the ZnO nanorods suggest its suitability for a range of antimicrobial uses, such as in the food industry and for various biomedical applications.

scholarly journals Decoration of Zinc Oxide Nanorods into the Surface of Activated Carbon Obtained from Agricultural Waste for Effective Removal of Methylene Blue Dye

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5667
Author(s):  
Priyanka Shrestha ◽  
Manoj Kumar Jha ◽  
Jeevan Ghimire ◽  
Agni Raj Koirala ◽  
Rajeshwar Man Shrestha ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Zinc Oxide ◽  
Activated Carbon ◽  
Agricultural Waste ◽  
Chemical Activation ◽  
Zno Nanorods ◽  
Waste Product ◽  
Hydrothermal Process ◽  
Photocatalytic Property ◽  
Zinc Oxide Nanorods

Zinc oxide (ZnO) nanorods incorporated activated carbon (AC) composite photocatalyst was synthesized using a hydrothermal process. The AC was prepared from lapsi (Choerospondias axillaris) seed stone, an agricultural waste product, found in Nepal by the chemical activation method. An aqueous suspension of AC with ZnO precursor was subjected to the hydrothermal treatment at 140 °C for 2 h to decorate ZnO rods into the surface of AC. As-obtained ZnO nanorods decorated activated carbon (ZnO/AC) photocatalyst was characterized by various techniques, such as scanning electron microscopy (SEM), X-ray diffraction (XRD), and photoluminescence (PL) spectroscopy. Results showed that highly crystalline hexagonal ZnO nanorods were effectively grown on the surface of porous AC. The photocatalytic property of the as-prepared ZnO/AC composite was studied by degrading methylene blue (MB) dye under UV-light irradiation. The ZnO/AC composite showed better photocatalytic property than that of the pristine ZnO nanorods. The enhanced photocatalytic performance in the case of the ZnO/AC composite is attributed to the combined effects of ZnO nanorods and AC.

scholarly journals Controlled Synthesis of Gold Nanoparticles UsingAspergillus terreusIF0 and Its Antibacterial Potential against Gram Negative Pathogenic Bacteria

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Eepsita Priyadarshini ◽  
Nilotpala Pradhan ◽  
Lala B. Sukla ◽  
Prasanna K. Panda
Keyword(s):  
Gold Nanoparticles ◽  
Pathogenic Bacteria ◽  
Particle Diameter ◽  
Weight Fraction ◽  
Xrd Analysis ◽  
Controlled Synthesis ◽  
Chloroauric Acid ◽  
Gram Negative ◽  
Fungal Extract ◽  
Vis Spectroscopy

Biosynthesis of monodispersed nanoparticles, along with determination of potential responsible biomolecules, is the major bottleneck in the area of bionanotechnology research. The present study focuses on an ecofriendly, ambient temperature protocol for size controlled synthesis of gold nanoparticles, using the fungusAspergillus terreusIF0. Gold nanoparticles were formed immediately, with the addition of chloroauric acid to the aqueous fungal extract. Synthesized nanoparticles were characterized by UV-Vis spectroscopy, TEM-EDX, and XRD analysis. Particle diameter and dispersity of nanoparticles were controlled by varying the pH of the fungal extract. At pH 10, the average size of the synthesized particles was in the range of 10–19 nm. Dialysis to obtain high and low molecular weight fraction followed by FTIR analysis revealed that biomolecules larger than 12 kDa and having –CH, –NH, and –SH functional groups were responsible for bioreduction and stabilization. In addition, the synthesized gold nanoparticles were found to be selectively bactericidal against the pathogenic gram negative bacteria,Escherichia coli.

scholarly journals Microwave Synthesis of Zinc Oxide/Reduced Graphene Oxide Hybrid for Adsorption-Photocatalysis Application

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Fatin Saiha Omar ◽  
Huang Nay Ming ◽  
Syed Muhamad Hafiz ◽  
Lim Hong Ngee
Keyword(s):  
Zinc Oxide ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Average Length ◽  
Hexagonal Phase ◽  
Zno Nanorods ◽  
Transmission Electron ◽  
Reduced Graphene ◽  
Enhanced Adsorption ◽  
Xrd Patterns

This work reports on synthesis of zinc oxide/reduced graphene oxide (ZnO/rGO) nanocomposites in the presence of diethylenetriamine (DETA) via a facile microwave method. The X-ray diffraction (XRD) patterns of the nanocomposites correspond to the ZnO hexagonal phase wurtzite structure. The high-resolution transmission electron microscopy (HRTEM) images revealed that the ZnO nanorods, with an average length : diameter ratio of 10, were successfully deposited on the rGO sheets. Under the irradiation of sunlight, the nanocomposites showed enhanced adsorption-photocatalysis by more than twofold and photocurrent response by sixfold compared to the ZnO. The excellent photoactivity performance of the nanocomposites is contributed by smaller ZnO nanorod and the presence of rGO that acts as a photosensitizer by transferring electrons to the conduction band of ZnO within the nanocomposite during sunlight illumination.

Preparation of Dandelion-Like Nano/Micro Zinc Oxide Material

2013 ◽  
Vol 652-654 ◽  
pp. 258-261
Author(s):  
Yu Liang
Keyword(s):  
Zinc Oxide ◽  
Large Scale ◽  
Solvothermal Method ◽  
Zno Nanorods ◽  
Three Dimensional ◽  
Kirkendall Effect ◽  
Oxide Material ◽  
Large Scale Preparation ◽  
Scale Preparation ◽  
Composition Structure

The three-dimensional dandelion-like zinc oxide nanostructure composed of single-crystal ZnO nanorods was prepared by means of Kirkendall effect while using solvothermal method and taking Zn powder as the source of zinc. In the paper, the composition, structure and appearance of the sample were studied by means of XRD, SEM, RDS, SEAD, TEM, HRTEM and other methods. The method was widely used as a new method for the large-scale preparation of nano/micro zinc oxide material.

scholarly journals Biosynthesis and characterization of silver nanoparticles using ginger spent and their antibacterial activity

2021 ◽  
pp. 174-179
Author(s):  
Sinthia Ganesan ◽  
Palanichamy Mehalingam ◽  
Govindan Sadasivam Selvam
Keyword(s):  
Silver Nanoparticles ◽  
Waste Product ◽  
Colour Change ◽  
Zingiber Officinale ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
Diffusion Method ◽  
Klebsiella Pneumonia ◽  
Gram Positive Bacteria ◽  
Vis Spectroscopy

Ginger spent is the byproduct of spice industries that remove the essential oils of ginger (Zingiber officinale) for food industry and medicinal purposes. Ginger is a well known spice used often for seasoning in Indian cuisine. The de-oiled ginger has no specific use mostly goes to waste. Hence, we utilized this industrial waste product in the efficient synthesis of silver nanoparticles with the aid of UV irradiation from a solution of 1mM silver nitrate and spent extract in the ratio 9:1. Immediate colour change from pale yellow to dark brown was noted indicating the rapid synthesis of silver nanoparticles. These nanoparticles were centrifuged, dried and well characterized. UV Vis Spectroscopy, XRD analysis, Zeta potential and SEM analysis was carried out. It was commendable that the size of the nanoparticles fell well within the upper limit of 100nm. Agar well diffusion method was used to screen the antimicrobial activity of the well characterized silver nanoparticles. They were tested against seven pathogenic strains of three gram negative bacteria (Escherichia coli, Klebsiella pneumonia and Pseudomonas aeruginosa) three gram positive bacteria(Bacillus subtilis, Staphylococcus aureus and Streptococcus faecalis) and a fungus (Candida  albicans). It was seen that the zone of inhibition(ZOI) in well plate method  increased on increasing the concentration of silver nanoparticles. Further studies could lead to the application of these silver nanoparticles in medicine.

scholarly journals Crystal growth of nanostructured zinc oxide nanorods from the seed layer

2018 ◽  
Vol 36 (3) ◽  
pp. 477-482
Author(s):  
B.O. Adetoye ◽  
A.B. Alabi ◽  
T. Akomolafe ◽  
P.B. Managutti ◽  
N. Coppede ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Absorption Spectrum ◽  
Zno Nanorods ◽  
Zinc Oxide Nanorods ◽  
Visible Range ◽  
Zno Nanostructures ◽  
Sem Images ◽  
Zno Nanostructure ◽  
Vis Spectroscopy ◽  
Fto Glass

AbstractOne-dimensional (1D) zinc oxide (ZnO) nanostructures (nanorods) were synthesized on a glass slide and fluorine-doped tin oxide (SnO2/F or FTO) coated glass (FTO/glass) by a wet chemical method. The structural, morphological and optical analyses of the as-deposited ZnO nanostructures were performed by X-ray diffractometry (XRD), scanning electron microscopy (SEM) and UV-Vis spectroscopy, respectively. The XRD results showed that the nanostructures as-deposited on the glass and the FTO/glass substrates were of ZnO wurtzite crystal structure, and the crystallite sizes estimated from the (0 0 2) planes were 60.832 nm and 64.876 nm, respectively. The SEM images showed the growth of densely oriented ZnO nanorods with a hexagonal-faceted morphology. The UV-Vis absorption spectrum revealed high absorbance properties in the ultraviolet range and low absorbance properties in the visible range. The optical energy band gap of the ZnO nanostructure was estimated to be 3.87 eV by the absorption spectrum fitting (ASF) method.

Morphological, Electrical and Optical Properties of Al-Doped Zinc Oxide Nanorods

2015 ◽  
Vol 1110 ◽  
pp. 218-221 ◽  
Author(s):  
R.R. Kothawale ◽  
R.M. Mohite
Keyword(s):  
Zinc Oxide ◽  
Optical Properties ◽  
Zno Nanorods ◽  
Resistivity Measurement ◽  
Xrd Analysis ◽  
Zinc Oxide Nanorods ◽  
Electrical Resistivity Measurement ◽  
Potential Candidate ◽  
Electrical And Optical Properties ◽  
Oxide Nanorods

We have studied the structural, electrical and optical properties of Al-doped Zinc Oxide (ZnO) nanostructures deposited on glass substrate by chemical bath deposition method. Scanning electrom microscope images clearly reveal that AZO nanorods were successfully grown. The XRD analysis indicates that polycrystalline nature of ZnO nanorods. The calculated grain size is about 84 nm. Electrical resistivity measurement study showes the minimum d.c. resistivity of 3.216×10-4 Ω.cm was obtained for the AZO films sintered at 300°C. It gives AZO can be adopted as a transparant conductive oxide (TCO) material. Optical transmission spectra showes that more than 80% transmission and 3.47 eV optical band gap of harvested AZO films. It is a potential candidate for ligth emitting diodes (LEDs), photonic crystals, TCO and photovoltaic application.

Crystal Structural Studies of ZnO Nanorods and their Band Gaps

2014 ◽  
Vol 938 ◽  
pp. 71-75
Author(s):  
Muhd Firdaus Kasim ◽  
Norlida Kamarulzaman ◽  
Suraya Ahmad Kamil
Keyword(s):  
Electron Microscopy ◽  
Zinc Oxide ◽  
Zno Nanorods ◽  
Chelating Agent ◽  
Band Gaps ◽  
Zinc Oxide Nanostructures ◽  
X Ray Diffraction ◽  
Soft Chemistry ◽  
Oxide Nanostructures ◽  
Vis Spectroscopy

Zinc oxide nanostructures have been done by many scientists but amongst the soft chemistry methods, chelating agents are normally used. In this work zinc oxide nanostructures have been synthesized using a soft chemistry method without using a chelating agent. The precursor were annealed at various temperatures of 400 °C, 500 °C, 600 °C, 700 °C, 800 °C and 1200 °C for 24 h. Nanostructures are found with rod-like shapes and they are compared with larger oval morphology. X-Ray diffraction (XRD), Field emission scanning electron microscopy (FESEM), and UV-Vis spectroscopy were used for characterization. XRD results confirm that all peaks were pure and single phase without the presence of any impurities. It was found from electron microscopy results that the morphology of the materials annealed at 400 °C possesses nanorod shape and as the calcination temperature increases, the material consists of mixed rod, spherical and oval shapes. The aspect ratio of the materials decreases when the annealing temperature increases. The absorption edges of the materials annealed at higher temperatures show a red-shift implying that narrowing of the band gaps occur in the materials. Band gap were evaluated and found to be between 3.32 to 3.19 eV.

Optical and Morphology Changes upon Self-Assembly of Tetrasulphonated Copper Phthalocyanine and Polyaniline Particles on Zinc Oxide Nanorods

2018 ◽  
Vol 916 ◽  
pp. 107-111
Author(s):  
Menandro C. Marquez
Keyword(s):  
Zinc Oxide ◽  
Self Assembly ◽  
Copper Phthalocyanine ◽  
Zno Nanorods ◽  
Linear Increase ◽  
Zinc Oxide Nanorods ◽  
Emeraldine Base ◽  
Layer By Layer ◽  
Vis Spectroscopy ◽  
Xrd Patterns

Zinc oxide (ZnO) nanorods were grown on the pre-seeded substrate using a facile, solution route technique. The multilayer self-assembly of polyaniline (PAni) and tetrasulphonated phthalocyanine (TSCuPc) on ZnO nanorods was monitored by FTIR, UV-Vis SEM and XRD. Infrared spectrum of the assembled layer showed peaks centered at 1589cm-1and 1504 cm-1, confirmed the presence of quinoid and benzenoid structures of PAni, while peaks centered at ~1165cm-1and ~775cm-1 provided evidence for the presence of TSCuPc species. Absorption spectra of the assembled layer show broadened peaks at ~600nm and ~700nm affirmed the presence of PAni and TSCuPc molecules. A linear increase in the absorbance level at these wavelengths was also observed upon increasing the number of bilayers. The surface modification of the ZnO nanorods after self-assembly was confirmed through SEM. The edges of the ZnO nanorods was observed to change from sharp to dull upon employing layer by layer deposition of PAni and TSCuPc. XRD pattern of the assembled layer showed broadened peaks at low 2Θvalues associated to the amorphous nature of the emeraldine base of PAni. Even so, the diffraction peaks in XRD patterns of ZnO nanorods and ZnO/(TSCuPc-PAni) multilayer have been indexed as hexagonally wurtzite structure. The multilayer deposition of PAni and TSCuPc on the surface of ZnO as monitored by UV-Vis spectroscopy and confirmed by FTIR, XRD, and SEM provides a new way of anchoring dye molecules without carboxylic moieties on the surface of metal oxides

Synthesis and Characterization of Zinc Oxide Nanostructures by Different Sonication Period

2014 ◽  
Vol 925 ◽  
pp. 110-114 ◽  
Author(s):  
Nurulnadia Sarip ◽  
Che Ani Norhidayah ◽  
Sharul Ashikin Kamaruddin ◽  
Farhanahani Mahmud ◽  
Siti Nooraya Mohd Tawil ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Zno Nanorods ◽  
Wide Band ◽  
Zinc Nitrate ◽  
Nitrate Hexahydrate ◽  
Zinc Oxide Nanostructures ◽  
Glass Substrates ◽  
Vis Spectroscopy ◽  
Acoustic Wave Devices

Zinc oxide (ZnO) is a wide band gap semiconductor material (3.37 eV) with numerous present applications such as varistors, surface acoustic wave devices and future biomedical applications. ZnO nanorods were grown under specific growth condition by an inexpensive and simple, chemical bath deposition method on ZnO seeded glass substrates. Study of the ZnO nanorods over different precursors, i.e zinc acetate dehydrate and zinc nitrate hexahydrate, and sonication period ranging from 0 to 120 seconds by field emission scanning electron microscope (FESEM), including the nanorod size and the surface morphology, will be demonstrated in this paper. Characterization of the ZnO film using both X-ray diffraction (XRD) and UV-Vis spectroscopy will be established in determining the optimal composition along with the optical properties, respectively.

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