Films of zno and au were deposited separately by ms and pld respectively to compare the. Origin of the surface recombination centers in zno nanorods. The minimum energy needed to extract an electron from the metal equals qf m, where f m is the workfunction. If there is oxidation, then there must be reduction, and vice versa. Repeat for each page excluding advertisement pages of the magazine. Department of science and technology itn, linkoping university, se60174 norrkoping, sweden 2. Request pdf preparation and gassensing properties of pure and nddoped zno nanorods by lowheating solidstate chemical reaction pure and nddoped zno nanorods were prepared by simple low. Osa optimal length of zno nanorods for improving the light. Lasl is a green technique that has been utilized to prepare metal, semiconductor and ceramic nanostructures. Zinc oxide nanoparticles can be synthesized readily with reagents that are inexpensive and relatively benign with regard to student use and waste disposal. Click browse, go to directory where you saved the printed pdfs. The energy of the valenceband maximum vbm was set to zero.
First, the seed layer of gold au has been deposited by plasma sputtering. You can either select the files you want to merge from you computer or drop them on the app using drag. Hal ini dikarenakan adanya cacat kristal alami zno seperti oxygen excess dan atom intersitisi dari zinc. The zno layers with the stm afm apparent height of 3. A comparative study of the stoichiometry of zno films deposited at rt and 300. Local characterization of ultrathin zno layers on ag111 by. Zinc oxide zno as one of the most important semiconductors has attracted significant attention in recent years. Due to its properties, the interest in zno as a photocatalyst has increased, however it has been mainly used.
Dillip kumar bisoyi department of physics national institute of technology, rourkela769008, orissa, india. Recently, the escobedomoraless group has reported a green method to prepare zno nanostructures employing as starting material zno2 prepared by hydrothermal method 17. Darra powder xrd spectra were taken on an xpert pro pw306460 diffractometer with a highthroughput stage and cuk. The photocatalytic efficiency of zno nanopowder, as one of optical properties, was compared with other photocatalysts such as commercial tio2 and. Structureactivity correlations of cu zno catalysts derived from different precursors as a function of aging by ernee noryana binti muhamad thesis submitted to the school of graduate studies, universiti putra malaysia, in fulfilment of the requirement of the degree of master of science february 2006. Selfassembly of densely packed and aligned bilayer zno.
Muthukumarasamy 2 1 svs college of engineering, coimbatore 642 109, india 2coimbatore institute of technology, coimbatore 64 1 014, india. Figure 2 is the experimental zn2p32 and zn2p12 photoelectron peaks of zno films prepared at rt. Preparation of zinc peroxide nanoparticles by laser. Synthesis and characterization of multipod, flowerlike, and shuttle. Karakteristik kristal zno tergantung pada ukuran dan metode preparasinya. Thinfilm transistors with active layers of zinc oxide zno. It is a iivi semiconductor which is highly transparent in the visible region with a wide and direct band gap of about 3. Structure and properties of transparent conductive doped. This webapp provides a simple way to merge pdf files. Synthesis and photoluminescence of zno nanophosphors.
System optical and photocatalytic behaviours of nanoparticles. Osa optimal length of zno nanorods for improving the. Under ambient condition the thermodynamic stable phase of zno nws takes a hexagonal wurtzite structure, which is shown in fig. Measurements and results challanges of quantifying pm emission from solid fuels. Pdf merge combine pdf files free tool to merge pdf online. From these results, the lattice parameters of zno could be determined, and found to be c0.
This model assumes that electrons are free to move within the metal but are confined to the metal by potential barriers as illustrated by figure 2. The schematic structure of the zno psi heterojunction is shown in figure 1. S1 supporting information optical and photocatalytic behaviours of nanoparticles in the ti zno binary system josephine b. Robust nanogenerator based on vertically aligned zno nanorods. Zno is a white powder that is insoluble in water, and it is widely used as an additive in numerous materials and products including rubbers, plastics, ceramics, glass, cement, lubricants, paints, ointments, adhesives, sealants, pigments, foods, batteries, ferrites, fire retardants, and firstaid tapes. Especially, quasionedimensional zno nanostructures e.
Benyoucef urmer, aboubakr belkaid university, 00, tlemcen algeria. Synthesis and characterization of manganese doped zno. We report the growth of wellaligned zno nanorods that were successfully synthesized on copper cu substrate by using a simple hydrothermal method at low temperature leading to a robust large area nanogenerator ng based on cost effective cu electrode which could enable energy harvest from the walking motions. Carbon fullerenes are insoluble and colloidal aggregates in aqueous solutions are stable for months to years, allowing for chronic. Free web app to quickly and easily combine multiple files into one pdf online. Afm when the bias voltage is below the conduction band edge of the zno layers.
Dari berbagai jenis bahan semikonduktor tersebut zinc oxide zno. Local characterization of ultrathin zno layers on ag111. Zno based inorganic photovoltaic materials chem c p p rs 68 15841591 2014 6. Znonaznoli 0 123 45 1 10 100 0 00 02 46 8 20 30 40 50 60 70 80 wt% diameter intensity 2 theta zno with naoh zno with lioh f h figure 1. The upper and lower panels show the top and perspective views of the pt zno contact interface. Crystallite size of the zno powder sample was calculated form the peak width using debye scherrer formula d 0. Print the page and save in some sequential order, for example 001. The schematic diagrams of the heterostructures are also shown in fig. Our pdf merger allows you to quickly combine multiple pdf files into one single pdf document, in just a few clicks. Preparation and gassensing properties of pure and nddoped zno nanorods by lowheating solidstate chemical reaction article in sensors and actuators b chemical 82. Preparasi kristal zno dengan ukuran nano telah dilakukan dengan metode yang berbedabeda seperti aerosol, emulsi mikro, ultrasonik, metode sol gel, evaporasi larutan dan suspensi, evaporasi dekomposisi.
Particularly, it shows an enhanced sensitivity when compared to zno mwcnt, zno swcnt, zno nfau and au zno mwcnt 59,63,64,66, lower lod compared to zno nanorods or zno. Synthesis of zinc oxide nanoparticles and characterization. While it is an oversimplification of the threedimensional potential and bandstructure in an actual semiconductor crystal, it is an instructive tool to demonstrate how the band structure can be calculated for a periodic potential, and how allowed and forbidden. Origin of the surface recombination centers in zno. Artgrowth of horizont al nopillars of cuo on nioito surfaces jo urn al of n anos cien ce icle id 635308 2014 7. We found that cu zno sensors have enhanced rt sensitivity, faster response time, and good selectivity. Xps and raman studies on 002 oriented nanocrystalline zno.
The zn2p spectra obtained from sol a and sol b are sharp and symmetric and have a maximum at fig. It is an inexpensive and environmentally safe host material. Ar andom ly orien ted rec ngu ar shaped nanostructures of cuo on nioito surface dvanced materials l et rs 7 735. The license for this pdf is unlimited except that no part of this digital document may be reproduced, stored in a retrieval system or tr ansmitted commercially in any form or by any but makes no expressed or implied warranty of any kind and assumes no responsibility for any errors or omissions. The free electron model of metals has been used to explain the photoelectric effect see section 1. To enter an ion specify charge after the compound in curly brackets. Goodall,a suela kellici,b derek illsley,c robert lines,c jonathan c knowlesd,e and jawwad a. Fabrication and characterization of zno nanorods on multiple. Synthesis and characterization of zno nanoparticles. Zinc oxide zno is an inexpensive optical material that has attention recently 1,2. Chai4 1department of physics, university of central florida, orlando, florida 32816, usa 2department of mechanical, materials, and aerospace engineering, advanced materials processing and analysis center, university of central florida, orlando, florida 32816, usa.
Atomic layer epitaxy of highly conductive zno layers. Intense research by many different groups has focused on novel nanostructures with different shapes ranging from nanowires to nanobelts and even nanosprings. The reverse breakdown voltages are estimated to be 8. The wurtzite crystal structure of zno with the lattice parameters a and c indicated in a, and the calculated band structure of zno. Request pdf synthesis and characterization of multipod, flowerlike, and shuttle like. Zno juga merupakan semikonduktor tipen dengan lebar pita energi 3,2 ev 3,3 ev pada suhu kamar. Invited paper thinfilm transistors with active layers of zinc oxide zno fabricated by lowtemperature chemical bath method huachi cheng a,b, chiafu chen a, chengchung lee b a department of materials science and engineering, national chiao tung university, taiwan, r. Karena sifatnya yang unik, zno secara luas telah digunakan untuk berbagai aplikasi seperti semikonduktor, sensor gas, spintronik, antibakteribiotik, fotodetektor dan fotokatalis.
Zno memiliki karakteristik 2 tipe yaitu tipep dan tipen. Robust nanogenerator based on vertically aligned zno. Remarkable progresses have been achieved, both theoretically and experimentally. The presence of both mn3o4 and zno was confirmed with xray diffractometry. Please tell about this free chemistry software to your friends. Th e morphology of the fabricated zno thin film was observed in a scanning electron microscope sem. Using this zno nanopowder as a photocatalyst, it was tried to recover silver from the silverplating wastewater that was discharged by noble metal plating industries. Structureactivity correlations of cuzno catalysts derived. Hybrid magnetron sputtering and pulsed laser ablation for. Fabrication and characterization of zno nanorods on. Material semikonduktor sebagai fotokatalis yang baik untuk degradasi polutan maupun senyawa beracun yakni zinc oxide zno, titania tio 2, tungtsen oxide.
Pt zno contact areas at three slidingbending stages ac. Zno na zno li 0 123 45 1 10 100 0 00 02 46 8 20 30 40 50 60 70 80 wt% diameter intensity 2 theta zno with naoh zno with lioh f h figure 1. As these values are a little bit smaller than the literature value c0. Nanosized zno powder was synthesized by solution combustion method scm. Here we investigate the local structure of ultrathin zno layers grown on ag111 using a simultaneous measurement of lowtemperature 5 k stm and noncontact atomic force microscopy ncafm. Zinc oxide zno zinc oxide merupakan sebuah senyawa kimia dengan rumus molekul zno, dan termasuk kedalam material semikonduktor 8. Xps investigation on the surface of zno photocatalytic. Afm phase images of ptb7 and pc 70bm bhj composites deposited on a pristine zno ripple. Optical and photocatalytic behaviours of nanoparticles in the ti zno binary system josephine b. They have performed their experiments with the third harmonic of a nd. Effect of annealing temperature on characterization of zno thin films by solgel method m.
Preparation of zinc peroxide nanoparticles by laser ablation. Nanostructured zinc oxide for water treatment request pdf. Soda pdf is the solution for users looking to merge multiple files into a single pdf document. The observed increase in the activity of the catalysts prepared by hc aging coincides with a decrease in copper crystallite size i. Zno mempunyai karakterisasi ntype semikonduktor, bahkan tanpa adanya pengotor atau dopant. Nilai celah pita energi untuk zno monokristal adalah antara 3,3 ev pada temperatur ruangan dan 3,44 ev pada temperatur 4 k dan untuk film zno polikristal adalah antara 3,28 3,30 ev dengyuan, 2005. Fabrication and characterization of zno nanorods on multiple substrates.
Sem images on the surface of the zno films deposited from sol ac b, sol ad c, sol bc e and sol bd f. Both al and ga diffuse in zno with a substitutional mechanism. Structure and properties of transparent conductive doped zno. Origin of the surface recombination centers in zno nanorods arrays by xray photoelectron spectroscopy l. In the temperature range of 750c the solubility of aluminium in zinc oxide is n 1. Considerable efforts have been made to obtain ptype zno by doping different elements with various techniques. Zno nanostructures, defects, and devices the interest in zno structures has increased drastically in recent years. The dotted lines show the approximate contact boundaries at the interface. Photocatalytic zno nanopowders prepared by solution.
Sifat inilah yang menjadi dasar aplikasi zno dalam teknologi film tipis antara lain adalah penggunaan zno. Xps and raman studies on 002 oriented nanocrystalline. The distance of the cu contacts on zno film is 1 mm. Preparation and gassensing properties of pure and nddoped. Table i xrd data, mn determined by edx and particles size of u zno and mn. Thinfilm transistors with active layers of zinc oxide zno fabricated by lowtemperature chemical bath method huachi cheng a,b, chiafu chen a, chengchung lee b a department of materials science and engineering, national chiao tung university, taiwan, r. Selfassembly of densely packed and aligned bilayer zno nanorod arrays l. Cu for different concentrations of cu and found for 1wt% cu in zinc oxide a higher response and selectivity to h2. To enter an electron into a chemical equation use or e. Zno memiliki struktur kristal wurtzite heksagonal, dengan nilai parameter k. Synthesis and characterization of zno nanoparticles submitted by jayanta kumar behera in partial fulfillment for the award of the degree of master of science in physics under the esteemed guidance of dr. A pair of contacts was made on the backside of a separate piece of the sample to check for ohmic contact formation.
Crystalline zinc oxide is thermochromic, changing from white to yellow when heated and in air reverting to white on cooling. The kronigpenney model demonstrates that a simple onedimensional periodic potential yields energy bands as well as energy band gaps. Zinc oxide is an inorganic compound with the formula zn o. Preparation and gassensing properties of pure and nd. Zno nps affected the growth rate of the algae and suggested that the zno nps were more toxic to the marine algae than bulk zno manzo and others 20. Darra powder xrd spectra were taken on an xpert pro pw306460 diffractometer with a highthroughput stage and. The national institute of engineering, mysore fa culty.
The responses of pure zno and cudoped zno rods studied in exactly the same condition are reported. Zno merupakan bahan semikonduktor tipen yang memiliki lebar pita energi 3,37 ev pada suhu ruang dan 3,34 ev pada temperatur rendah dengan nilai energi ikat eksitonnya sebesar 60 mev takena et al. Optimal length of zno nanorods nrs on blue ingan lightemitting diodes leds was investigated to improve the lightextraction efficiency lee of the led. Zno nanorods based hydrazine sensors article in journal of nanoscience and nanotechnology 98. Zno pertama kali ditemukan oleh ahli kimia dari perancis yang bernama. The electrical properties of na doped zno films are summarized in table 6, indicating that the conduction of na doped zno films transformed from ntype to ptype with the na content in the targets increases and the na doped ptype zno films with a resistivity of.
The crystal structure of zno films were studied using high resolution x ray diffraction technique. Xps spectra of zno films were analysed to investigate the chemical states of zn and o and their percentage in zno film. Electrochemistry before we can talk reactions oxidation state or oxidation number. The xrd pattern zno films, annealed at different temperature is shown in figure 1,2,3. The wurtzite crystal structure of zno with the lattice parameters a and c indicated in a, and the calculated band structure of zno using the hse hybrid functional in b. Sebagai katalis dalam proses fotokatalitik zno lebih baik dibanding dengan tio 2 karena memiliki aktivitas yang lebih tinggi. A hybrid technique that combines magnetron sputtering ms of zinc oxide and pulsed laser deposition pld of gold was used to synthesize zno au composite thin films. Thinfilm transistors with active layers of zinc oxide. On the other hand, mapping the onset of the resonance state of the zno layer by scanning tunneling spectroscopy provides a basis for determining its thickness. Seng oksida adalah semikonduktor dengan celah pita energi langsung direct band gap. We assume that these high values for n arise from the interplay of multiple.
658 327 1406 776 431 1214 563 1187 1321 1409 1265 1047 42 1361 1067 306 1618 300 62 744 1672 89 1492 265 740 704 1450 1291 1400 260 292 969