Preparation Of ZnO Nanorods Research Articles

Preparation of ZnO nanorods or SiO2 nanoparticles grafted onto basalt ceramic membrane and the use for E. coli removal from water

This article addresses the fabrication of a novel and eco-friendly ceramic membrane based on basalt powder via press and sintering methods with a pore size of 1.5–2 μm. The basalt ceramic membrane (BCM) was grafted by SiO2 nanoparticles (50–60 nm) and ZnO nanorods (2.2 μm). The water permeability for the prepared membranes was measured 345.3, 701.4, and 801.9 L/m2 h bar for bare BCM, SiO2-BCM, and ZnO-BCM, respectively. The prepared membranes were used in Escherichia coli (E. coli) removal, and 100% E. coli removal efficiency was achieved at a transmembrane pressure of 0.5 bar for all membranes. The antimicrobial activities of the solid surfaces for BCM, SiO2-BCM, and ZnO-BCM were also studied using E. coli as a model test microorganisms. The antimicrobial activities for bare BCM, SiO2-BCM, and ZnO-BCM were 20.57%, 74.90%, and 100%, respectively. The results are of great importance in terms of the reusability of membranes and the prevention of biofilm formation in wastewater treatment processes.

The Cell Performances of DSSCs with ZnO Nanorod Electrodes

To date, dye-sensitized solar cells (DSSCs) based on TiO2 nanoparticles have been widely investigated due to their high conversion efficiency. However, constructing TiO2 into a structure of nanorods with a high aspect ratio is difficult to be achieved. On the other hand, nanorod/nanowire arrays may provide some advantages, such as an efficient pathway for electron transport and a larger surface area for dye absorption. ZnO is one kind of metal oxides that can be formed into nanorods easily with various methods. Here, we reported our works on the preparation of ZnO nanorods and investigate its DSSC performance. We found that the cell performance was very affected by the diameter of the nanorods, which may then indicate that charge transfer and charge extraction processes are more effective in the cell with a smaller nanorod diameter.

Preparation of ZnO Nanorods with Lattice Vacancies and Their Application in Ni-Zn Battery

Preparation of ZnO Nanorods with Lattice Vacancies and Their Application in Ni-Zn Battery

Preparation of ZnO Nanorods by Hydrothermal Process at Different Temperatures

The International Scientific Research Organization for Science, Engineering and Technology (ISROSET) is a Non-Profit Organization; The ISROSET is dedicated to improvement in academic sectors of Science (Chemistry, Bio-chemistry, Zoology, Botany, Biotechnology, Pharmaceutical Science, Bioscience, Bioinformatics, Biometrics, Biostatistics, Microbiology, Environmental Management, Medical Science, Forensic Science, Home Science, Library Science, Material Science Military Science, Physical Science, Physical Education Science, Educational Science, Fisheries, seed technology, Agriculture, Forestry Science, Mathematics, Physics, Statistics and Geology/Earth Science), Computer Science, Engineering and Information Technology, Commerce, Management, Economics Sociology and Social Science.

Preparation of ZnO Nanorods by Hydrothermal Process at Different Temperatures

The International Scientific Research Organization for Science, Engineering and Technology (ISROSET) is a Non-Profit Organization; The ISROSET is dedicated to improvement in academic sectors of Science (Chemistry, Bio-chemistry, Zoology, Botany, Biotechnology, Pharmaceutical Science, Bioscience, Bioinformatics, Biometrics, Biostatistics, Microbiology, Environmental Management, Medical Science, Forensic Science, Home Science, Library Science, Material Science Military Science, Physical Science, Physical Education Science, Educational Science, Fisheries, seed technology, Agriculture, Forestry Science, Mathematics, Physics, Statistics and Geology/Earth Science), Computer Science, Engineering and Information Technology, Commerce, Management, Economics Sociology and Social Science.

Preparation of ZnO nanorods on conductive PET-ITO-Ag fibers

We studied the vertical ZnO nanorods grown on conductive conventional polyethylene terephthalate (PET) fibers which are prepared by electroless silver depositing on tin-doped indium oxide (ITO) coated PET fibers through an efficient and low-cost green approach. The PET fibers were firstly functionalized with a layer of ITO gel synthesized through a sol–gel process at rather low temperature, simply by immersing the fibers into ITO sol for several minutes followed by gelation at 120°C. Once the ITO gel layer surface was activated by SnCl2, a continuous, uniform, and compact layer of silver was carried out on the surface of the PET-ITO fibers through electroless plating operation at room temperature. The as-prepared PET-ITO-Ag fibers had good electrical conductivity, with surface resistivity as low as 0.23mΩcm. The overall procedure is simple, efficient, nontoxic, and controllable. The conductive PET-ITO-Ag fiber was used successfully as a flexible basal material to plant vertical ZnO nanorods through controlling the seeding and growth processes. The morphology of the PET-ITO, PET-ITO-Ag, and PET-ITO-Ag-ZnO fibers were observed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Undergone the whole process, although the tensile strength of the fiber decreased slightly, they may still exert their applications in flexible electronic such as photovoltaic and piezoelectric devices.

The Role of Polyvinylpyrrolidone in Hydrothermally Synthesized Ag/ZnO Nanocomposites and Their Photocatalytic Activities.

Here we present a simple hydrothermal route for the preparation of photoactive ZnO and Ag/ZnO nanoparticles (NPs) synthesized in the presence and absence of polyvinylpyrrolidone (PVP). The low temperature synthesis is carried out in ethylene glycol (EG) medium at 180 degrees C, where EG is used as a reducing agent for the Ag+ ions. PVP is exploited as a size confining matrix for the Ag NPs. The present synthetic protocol allows the preparation of ZnO nanorods (NRs) with typical lengths of -200 nm and Ag/ZnO NPs with typical sizes of -100 nm. The photocatalytic activity of the as-prepared nanomaterials was tested for degradation of model pollutant methyl orange (MO) dye and terephthalic acid (TPA). We found that the Ag/ZnO NPs synthesized in PVP showed higher photoactivity than the commercial TiO2 (P25) powder or ZnO and Ag/ZnO NPs synthesized without PVP.

English

The Dip coating method was used for the preparation of ZnO nano rods and their structural, morphological, optical and photoluminescence properties were taken for study. ZnO seed layer thin films were prepared by dip coating method on well cleaned glass substrates. ZnO seed-coated glass substrates were immersed in aqueous solution of zinc nitrate and hexamethylenetetramine (HMT) at three different growth time of 3, 4 and 5 hours at low temperature of 90°C. 0.02 mol of Zinc nitrate and 0.2 mol of Hexamethylenetetramine (HMT) on 1:10 molar concentration were used for the growth of Zinc oxide nano rods. The growth time influence on the surface morphology of the films was examined. The structure of the ZnO nano rod was studied with X-ray diffraction. The surface morphology was studied with Scanning Electron Microscope. The absorption and transmittance was studied with UVVis spectrophotometer. The excitation studies were examined with photoluminescence spectroscopy. Experimental results have shown that prepared ZnO nano rods by this method have increase in c-axis orientation due to increase in growth time.

Preparation of ZnO nanorods on cellulose fiber paper and their charge‐generating application for waste paper recycling

AbstractZinc oxide (ZnO) nanorod arrays (NRAs) were well integrated on the cellulose fibers (CFs) of waste paper via a facile hydrothermal method. By mechanically blending the waste paper with de‐ionized water, abundant CFs were obtained and used as a sufficient platform for integrating ZnO NRAs. After coating a thin ZnO seed layer onto the surface of CFs and subsequent thermal treatment, the ZnO NRAs were densely grown, exhibiting high crystallinity and good photoluminescence properties. Their sizes were readily controlled by changing the concentration of the growth solution. To test the feasibility of an energy harvesting application using the prepared samples, the piezoelectric charge generation was explored under an external pushing force for the fabricated devices with polydimethylsiloxane‐shielded ZnO NRAs on CFs for good contact to two electrodes (i.e., gold and indium tin oxide). This nanotechnology of recycling waste paper could be considered as a promising candidate for implementation in cost‐effective and environment‐friendly advanced materials and energy production. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Optical and Structural Properties of ZnO Nanorods Prepared by Chemical Bath Deposition Method

Abstract The Chemical bath deposition method was used for the preparation of ZnO nanorods and their optical and structural properties were studied. ZnO seed layer thin films were prepared by chemical bath deposition technique on to well cleaned glass substrates. ZnO seed-coated glass substrates were immersed in aqueous solution of zinc nitrate and hexamethylenetetramine (HMT) on 1:10 molar concentration at 90°C for 4 hours and annealed at different temperatures. The effect of annealing temperatures on the surface morphology and optical properties of the films was studied. The structure of the ZnO nano rod was studied by X-ray diffractometer and scanning electron microscopy. The optical property was studied by UV-Vis spectroscopy and photoluminescence spectroscopy. Experimental results have shown that prepared ZnO nanorods by this method have higher photoluminescence

Preparation of ZnO nanorods via aqueous solution process and their PL properties

Highly crystalline ZnO with hexagonal rod-like morphology was fabricated by a carboxylate-modified PS (polystyrene)-assisted hydrothermal process. The reactions could be carried out under mild conditions in an inexpensive and environmentally-friendly way, and was suitable for large scale production. The as-prepared ZnO nanorods, with lengths of 200–280nm and diameters of 100–130nm, possessed a single-crystal hexagonal structure and grew along the [001] direction. Furthermore, the results revealed that the carboxylate-modified PS played a vital role in the synthesis of rod-like structure ZnO. In addition, photoluminescence (PL) spectrum showed a strong UV emission peak of ZnO samples at room temperature.

Preparation of ZnO nanorods by microemulsion synthesis and their application as a CO gas sensor

Zinc oxide nanorods with different surface area were synthesized by surfactant assisted microemulsion method. The alkyl chain length of surfactant would affect aspect ratio of ZnO nanorods. ZnO nanorods synthesized by ethyl benzene acid sodium salt (EBS), which is surfactant with short alkyl chain length, show higher aspect ratio than ones by dodecyl benzene sulfonic acid sodium salt (DBS). These nanorods had diameters in the range of 80–300 nm and length of up to several microns. The Brunauer–Emmett–Teller (BET) surface area of the ZnO nanorods was strongly affected by the morphology of the nanorods. The BET surface area of the nanorods synthesized with EBS was higher than the surface area of the nanorods synthesized with DBS (20.2 and 14.1 m 2/g for EBS and DBS, respectively). The response of ZnO nanorods to CO in air was strongly affected by surface area, defects and oxygen vacancies. The results demonstrate that the microemulsion synthesis is an easy and useful method to synthesize ZnO nanorods with large aspect ratio, which may enhance their gas sensing properties.

Preparation of ZnO Nanorods in the Presence of Nano Preyssler as a Green and Eco-Friendly Polyoxometalate and its Photocatalytic Activity in the Photodegradation of Methyl Orange

A novel and simple approach is reported to fabricate ZnO nanorods in the presence of nano Preyssler polyoxometalate. The morphology and size of these nanorods were characterized using transmission electron microscopy and X-ray diffraction. The performance of nano form of Preyssler was compared with bulk form. Results showed that both Preyssler and nano Preyssler produce ZnO nanorods via a solvothermal route. In a designed photo reactor, the photocatalytic degradation of methyl orange as common azo dye pollutants was selected as a test reaction to estimate the catalytic activity of the synthesized ZnO nanorods and found to be excellent.

Preparation and Spectral Properties of PVP-Modified ZnO Nanorods

ZnO nanorods were prepared by a hydrothermal reaction in the presence or absence of PVP (polyvinyl pyrrolidone). The obtained products were characterized by means of X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared, UV-Vis absorption (UV) spectroscopy and photoluminescence (PL) spectroscopy. The results suggest that PVP plays an important role in the preparation of ZnO nanorods. The UV absorption spectrum showed PVP increases the UV-shielding ability but doesn’t influence the transparency in the visible light region. A weak UV emission at 353 nm of PL spectra exhibit the surface of ZnO nanorods is passivated and oxygen-related defects is supplied by PVP.

Preparation of ZnO nanorods through wet chemical method

The different morphologies of nanorods have been obtained via a simple wet chemical method in the present of polyethylene glycol (PEG, M w = 4000) by using zinc nitrate hexahydrate (Zn(NO 3) 2·6H 2O) and ammonium hydroxide (NH 3·H 2O) as the starting materials. Samples were characterized by XRD, EDS, TEM, SEM, ED and PL. XRD results prove the formation of ZnO with wurtzite structure. The ED and HRTEM reveal that single ZnO nanorod is single crystal and preferentially grows up along the [001] direction. The PL spectra showed that the ZnO nanorods have blue emission at 466 nm and green–yellow emission at 542 nm. The influence of reaction temperature, pH in system and evaporation of ammonia on the morphology has been investigated. A possible growth mechanism of ZnO with various morphologies is discussed.

Preparation of ZnO nanorods and special lath-like crystals by aqueous chemical growth (ACG) method

Special lath-like ZnO crystals and arrays of well-aligned ZnO nano/micro-composite rods were synthesized on ZnO seed-coated glass substrates by aqueous chemical growth (ACG) method. PEG was added into the seed precursor solution to obtain seed layers with different textures, on which nano/micro-composite rods were formed. Special lath-like crystals were fabricated by prolonging the growth time to 48 h. X-ray diffraction and scanning electron microscopy analyses reveal that highly c-oriented rod crystals grow vertically from the substrate. The possible growth mechanism concerning special lath-like crystals and nano/micro-composite rods has been discussed.

Preparation of ZnO Nanorods and optical characterizations

Single crystalline ZnO nanorods have been prepared by hydrothermal method with synthesized ZnCl 2·4Zn(OH) 2 as precursors. Morphologies of the nanorods were controlled by various reaction conditions with cetyltrimethylammonium bromide (CTAB) as modifying agent. The nanorods were characterized by techniques such as XRD, TEM, UV–Vis spectra, IR and PL spectra. Microstructure of holes in nanosize was observed on the surface of the nanorod. The UV–Vis spectra indicated that the as-prepared ZnO nanorods have absorption of visible light as well as ultraviolet light. Therefore, these nanorods may be good candidate for visible-light photocatalysis materials from the viewpoint of practical applications. The reason for visible-light absorption was discussed. The photoluminescence property of the nanorod was also investigated.