DNA - Directed Synthesis of ZnO Nanowires

2008 ◽  
Vol 1094 ◽  
Author(s):  
Micha Jost ◽  
Petia Atanasova ◽  
Peter Gerstel ◽  
Wilfried Sigle ◽  
Peter A. van Aken ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Nitrate Solution ◽  
Zinc Nitrate ◽  
Zno Nanowires ◽  
X Ray Diffraction ◽  
Structure Directing Agent ◽  
Simple Method ◽  
Transmission Electron ◽  
Fish Sperm ◽  
Sperm Dna

AbstractIn this paper, a new and simple method for the synthesis of ZnO nanowires under very mild conditions is presented. The nanowire preparation is based on mineralization from alkaline aqueous zinc nitrate solution in the presence of fish sperm DNA as a structure-directing agent. The morphological features of the obtained structures were investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), while the structural characterization of ZnO was done by X-ray diffraction.

scholarly journals Antimicrobial Bacterial Cellulose-Silver Nanoparticles Composite Membranes

2011 ◽  
Vol 2011 ◽  
pp. 1-8 ◽  
Author(s):  
Hernane S. Barud ◽  
Thaís Regiani ◽  
Rodrigo F. C. Marques ◽  
Wilton R. Lustri ◽  
Younes Messaddeq ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Bacterial Cellulose ◽  
Nitrate Solution ◽  
Composite Membranes ◽  
Silver Nitrate Solution ◽  
Complexing Agent ◽  
X Ray Diffraction ◽  
Gram Positive Bacteria ◽  
Transmission Electron

Antimicrobial bacterial cellulose-silver nanoparticles composite membranes have been obtained by“in situ”preparation of Ag nanoparticles from hydrolytic decomposition of silver nitrate solution using triethanolamine as reducing and complexing agent. The formation of silver nanoparticles was evidenced by the X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and absorption in the UV-Visible (350 nm to 600 nm). Thermal and mechanical properties together with swelling behavior for water were considered. TEA concentration was observed to be important in order to obtain only Ag particles and not a mixture of silver oxides. It was also observed to control particle size and amount of silver contents in bacterial cellulose. The composite membranes exhibited strong antimicrobial activity against Gram-negative and Gram-positive bacteria.

scholarly journals Synthesis of ZnO Nanowires via Hotwire Thermal Evaporation of Brass (CuZn) Assisted by Vapor Phase Transport of Methanol

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Tamil Many K. Thandavan ◽  
Siti Meriam Abdul Gani ◽  
Chiow San Wong ◽  
Roslan Md Nor
Keyword(s):  
Electron Microscopy ◽  
Vapor Phase ◽  
Thermal Evaporation ◽  
Zno Nanowires ◽  
X Ray Diffraction ◽  
Tem Analysis ◽  
Vapor Phase Transport ◽  
Transmission Electron ◽  
Lattice Planes ◽  
Phase Transport

Zinc oxide (ZnO) nanowires (NWs) were synthesized using vapor phase transport (VPT) and thermal evaporation of Zn from CuZn. Time dependence of ZnO NWs growth was investigated for 5, 10, 15, 20, 25, and 30 minutes. Significant changes were observed from the field electron scanning electron microscopy (FESEM) images as well as from the X-ray diffraction (XRD) profile. The photoluminescence (PL) profile was attributed to the contribution of oxygen vacancy, zinc interstitials, and hydrogen defects in the ZnO NWs. Raman scattering results show a significant peak at 143 cm−1and possible functionalization on the wall of ZnO NWs. Growth of ZnO NWs in (0002) with an estimated distance between adjacent lattice planes 0.26 nm was determined from transmission electron microscopy (TEM) analysis.

scholarly journals Curd Mediated Facile Synthesis of ZnO/Ag/NiO Heterostructures and Visible Light Assisted Photodegradation of Methylene Blue

2020 ◽  
Vol 32 (12) ◽  
pp. 3203-3208
Author(s):  
J.P. Shubha ◽  
B.S. Prathibha ◽  
N. Jayalakshmi
Keyword(s):  
Electron Microscopy ◽  
Methylene Blue ◽  
Visible Light ◽  
Analytical Techniques ◽  
Zinc Nitrate ◽  
Blue Dye ◽  
Methylene Blue Dye ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Light Concentration

Green fuel perished curd was used to synthesize ZnO/Ag/NiO ternary heterostructure with zinc nitrate, nickel carbonate and silver nitrate as oxidizers. The obtained nanostructure was characterized by various analytical techniques such as powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (FESEM), transmission electron microscopy (TEM). The particles and flakes composition of ZnO/Ag/NiO nanomaterials was confirmed. Photocatalytic activity of ZnO/Ag/NiO was evaluated with methylene blue dye by source of light, concentration of hydrogen ion, catalyst and dye concentrations. The obtained ZnO/Ag/NiO nanoparticles reveal better catalytic property for the photodegradation of methylene blue dye under visible light.

Synthesis and Characterizations of Metal Oxide-Sulfonic Acid Functionalized ZSM-5 for Photocatalytic Degradation and Adsorption of Dimethylarsenic Acid

2014 ◽  
Vol 699 ◽  
pp. 994-999 ◽  
Author(s):  
Alias Mohd Yusof ◽  
Nur Nadira Sulaiman ◽  
Hadi Nur
Keyword(s):  
Electron Microscopy ◽  
Absorption Band ◽  
Ultra Violet ◽  
Arsenic Species ◽  
Zinc Nitrate ◽  
X Ray Diffraction ◽  
Alkyl Groups ◽  
Transmission Electron ◽  
Stretching Vibration

TiO2 and ZnO were incorporated into ZSM-5 using titanium tetrachloride and zinc nitrate as the precursors respectively. The functional group of ZSM-5 was further modified using mercaptopropyl trimethoxysilane (MPTS). This method was used to produce a two-in-one composite namely TiO2-ZSM5-SH and ZnO-ZSM5-SH which holds the abilities to degrade organic pollutants as well as to remove them from the environment. Determination of the composition and morphology of all synthesized catalyst complexes were characterized using Fourier Transformed Infrared (FTIR), X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and High Resolution Transmission Electron Microscopy (HR-TEM). Results obtained indicated that the average diameters for TiO2-ZSM5-SH particles are 2.398 μm, slightly larger than the diameter of ZnO-ZSM5-SH particles with an average of 1.8067 μm. Both TiO2-ZSM5-SH and ZnO-ZSM5-SH appeared as sphere-like shape and amorphous since both metal oxides were incorporated into the ZSM-5 pores. The compositions of these complexes were proven by the presence of a strong silica absorption band showing the existence of Si-O stretching vibrations and SiO2 asymmetric vibrations in the synthesized complexes. For TiO2-ZSM5-SH, the Ti-O stretching vibration can be seen at 3467.29 cm-1 and at 1637.86 cm-1 while Zn-O absorption band appeared at 455.52 cm-1 in ZnO-ZSM5-SH. The symmetric and asymmetric vibrations of –CH2 and –CH3 indicate the existence of alkyl groups in the ZSM-5. The ability of catalyst complexes synthesized as photocatalyst were applied and tested on the photodegradation of dimethylarsenic acid (DMA) under ultra violet (UV) radiation which showed that these catalyst complexes are proven be able to degrade DMA into less toxic intermediates and are able to adsorb the remaining arsenic species from the aqueous solutions.

scholarly journals Isolation and Characterisation of Cellulose Nanofibre and Lignin from Oil Palm Empty Fruit Bunches

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2290 ◽  
Author(s):  
Saharman Gea ◽  
Amir Hamzah Siregar ◽  
Emma Zaidar ◽  
Mahyuni Harahap ◽  
Denny Pratama Indrawan ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Oil Palm ◽  
Crystallinity Index ◽  
X Ray Diffraction ◽  
Simple Method ◽  
Empty Fruit Bunches ◽  
Chemical Structures ◽  
Transmission Electron ◽  
Nmr Spectrometry ◽  
Soda Pulping

A study on isolation and characterisation of cellulose nanofibre (CNF) and lignin was conducted to expand the application of CNF and lignin from oil palm biomass. CNF was extracted by steam explosion and the by-product was precipitated to obtain lignin by using the soda-pulping method. The concentrations of NaOH used for CNF by-product precipitation were 2%, 4%, and 6%. The morphology of CNF and lignin was characterised using scanning electron microscopy (SEM). The nanofibre of CNF with dimension between 50 nm and 100 nm was investigated using transmission electron microscopy (TEM). The functional group was observed using Fourier-transform infrared (FTIR) spectroscopy, showing that CNF had the structure of cellulose-I. In addition, the chemical structures of isolated and commercial lignin were analysed using 1H-NMR spectrometry. CNF had a 72% crystallinity index characterised by X-ray diffraction (XRD), while lignin showed an amorphous form. The characterisation of isolated lignin was compared with commercial lignin. The two lignins had similar particle size distribution from 1 to 100 μm. From UV-visible analysis, the lignin had aromatic rings/non-conjugated phenolic groups. The morphology of isolated lignin was rough and flaky. Commercial lignin was in powder form with near-spherical morphology. Thermogravimetric analysis (TGA) of CNF showed 30% of residue at 600 °C. The results showed a simple method to isolate CNF and lignin from oil palm empty fruit bunches.

scholarly journals Microwave assisted hydrothermal synthesize of ZnO nanorods and their characterization

2012 ◽  
Vol 05 ◽  
pp. 72-78
Author(s):  
NADI SHOJAEE ◽  
TOURADJ EBADZADEH ◽  
ALIREZA AGHAEI
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Zno Nanorods ◽  
Heating Time ◽  
Zinc Nitrate ◽  
X Ray Diffraction ◽  
X Ray ◽  
Domestic Microwave Oven ◽  
Transmission Electron ◽  
Vis Spectroscopy

In present study ZnO nanorods were synthesized in an aqueous solution using a domestic microwave oven for irradiation. The nanorods have been grown on substrates immersed in an aqueous solution which contains zinc nitrate and hexamethylenetetramine as precursors. Eventually, effect of some parameters such as precursor's concentration and heating time on growth mechanism was characterized. The product phase was detected using X-ray diffraction (XRD). Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) exhibited the resultant structure is uniform and single crystalline. Finally Uv-Vis spectroscopy was used to measure the nanorod's band gap.

scholarly journals Optical Properties of Indium Doeped ZnO Nanowires

2015 ◽  
Vol 2015 ◽  
pp. 1-6
Author(s):  
Tsung-Shine Ko ◽  
Sin-Liang Ou ◽  
Kuo-Sheng Kao ◽  
Tz-Min Yang ◽  
Der-Yuh Lin
Keyword(s):  
Electron Microscopy ◽  
Blue Shift ◽  
Zno Nanowires ◽  
Near Band Edge ◽  
X Ray Diffraction ◽  
Thermal Evaporation Method ◽  
Transmission Electron ◽  
Energy Dispersion Spectrum ◽  
Vapor Liquid Solid Mechanism

We report the synthesis of the ZnO nanowires (NWs) with different indium concentrations by using the thermal evaporation method. The gold nanoparticles were used as the catalyst and were dispersed on the silicon wafer to facilitate the growth of the ZnO NWs. High resolution transmission electron microscopy confirms that the ZnO NWs growth relied on vapor-liquid-solid mechanism and energy dispersion spectrum detects the atomic percentages of indium in ZnO NWs. Scanning electron microscopy shows that the diameters of pure ZnO NWs range from 20 to 30 nm and the diameters of ZnO:In were increased to 50–80 nm with increasing indium doping level. X-ray diffraction results point out that the crystal quality of the ZnO NWs was worse with doping higher indium concentration. Photoluminescence (PL) study of the ZnO NWs exhibited main photoemission at 380 nm due to the recombination of excitons in near-band-edge (NBE). In addition, PL results also indicate the slightly blue shift and PL intensity decreasing of NBE emission from the ZnO NWs with higher indium concentrations could be attributed to more donor-induced trap center generations.

SYNTHESIS, STRUCTURE, AND LUMINESCENCE PROPERTIES OF ZnSnO3 NANOWIRES

NANO ◽  
2012 ◽  
Vol 07 (02) ◽  
pp. 1250013 ◽  
Author(s):  
SOYEON AN ◽  
CHANGHYUN JIN ◽  
HYUNSU KIM ◽  
SANGMIN LEE ◽  
BONGYONG JEONG ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Green Emission ◽  
Blue Shift ◽  
Zno Nanowires ◽  
X Ray Diffraction ◽  
Ultraviolet Emission ◽  
Violet Emission ◽  
X Ray ◽  
Transmission Electron

ZnSnO3 nanowires were synthesized on Si substrates by thermal evaporation of a mixture of ZnO, SnO2 and graphite powders. The nanowires were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and photoluminescence spectroscopy. The ZnSnO3 nanowires varied from 10 to 100 nm in diameter and up to a few hundred of micrometers in length. Transmission electron microscopy and X-ray diffraction revealed that the nanowires are multiphase nanostructures containing ZnSnO3, Zn2SnO4, ZnO, and SnO2 phases. Photoluminescence measurements showed that ZnSnO3 nanowires had a sharp ultraviolet emission peak at approximately 375 nm as well as a broad green emission band centered at approximately 510 nm. The violet emission of ZnSnO3 nanowires exhibits a blue shift by approximately 5 nm compared to that of ZnO nanowires and the visible emission of ZnO nanowires shifted from the orange region to the green region, which should be attributed to the narrowing of Eg. Thermal annealing enhanced the green emission but degraded the ultraviolet emission of the ZnSnO3 nanowires. In addition, the origin of the enhanced luminescence of ZnSnO3 nanowires compared to ZnO and SnO2 nanowires is discussed.

scholarly journals Growth of ZnO Nanowires in Aqueous Solution by a Dissolution-Growth Mechanism

2008 ◽  
Vol 2008 ◽  
pp. 1-5 ◽  
Author(s):  
Shaojing Bu ◽  
Chunxiang Cui ◽  
Qingzhou Wang ◽  
Ling Bai
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Growth Mechanism ◽  
Zno Nanowires ◽  
Film Morphology ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Morphology And Structure ◽  
Scanning Electron

A novel methodology based on the dissolution-growth mechanism was developed to prepare ZnO nanowires films. The film morphology and structure were investigated by using field emission scanning electron microscopy, high-resolution transmission electron microscopy and X-ray diffraction analysis methods. The results show that the ZnO nanowires are single crystallinec-oriented wurtzite. The ZnO rod crystals were eroded to provide the growth primitive of ZnO nanowires, which formed on top of the rod crystals when the erosion reaction got the equilibrium. The length of the resultant nanowires is rather large because the successive erosion of the rod crystals maintains the low concentration ofZn2O(OH)2n−2in the aqueous solution.

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