Synthesis and characterization of zno nanostructures. By engineering the degree of order in various dielectric and metallic nanostructures, i demonstrate that light. Hence, controllable synthesis of zno nanostructures is of great importance to tailor their physical properties and improve device performance 911. Thus, studies on the fabrication and characterization of zno thin lms 912 and nanostructures 16 have been extensively carried out. Figures 4a4d show the zno nanostructure arrays, grown at solution concentrations of 0. Complex and oriented zno nanostructures zhengrong r. Synthesis of zno nanostructures for device applications. Complex and oriented zno nanostructures researchgate. Structural and optical properties of ndoped zno nanorod. Variation in surface morphology was analyzed using transmission electron microscopy tem.
There is no indication of any secondary phase or clusters confirming that the samples are only one single phase. Zno nanorods nrs are potentially ideal for applications such as gas sensors, nanolasers, transparent electrodes in solar cells, as. Surprisingly, very few reports demonstrated ptype doping of zno nanostructures using nitrogen, though initial fabrication methods of ptype zno thin. Mechanism and growth of flexible zno nanostructure arrays. A facile approach to fabricate dyesensitized solar cells dsscs is demonstrated by depositing 001 oriented zinc oxide zno nanostructures. Zinc oxide zno nanostructures such as nanoparticles, nanowires, nanorods, etc. Structural studies of zno nanostructures by varying the.
We provide a brief introduction to different fabrication methods. Growth of zno nanostructures with controllable morphology. Zno nanostructures were grown on metallic zinc nanocones by thermal oxidation. Shape evolution of zno nanostructures modified by trioctylphosphine oxide. Effect of na doping on the nanostructures and electrical. Hierarchical zno nanostructures have been synthesized on in2o3 core nanowires by a vapor transport and condensation process.
Zinc oxide zno nanostructures of various morphologies were produced in an aqueous system, with pyridine as a shapedirecting agent. Experimental results proved that the possible growth mechanism of zno nanostructures was oriented attachment. Nano express open access controllable synthesis of zno. Zno is a typical member of the wurtzite family of structures. The sem images showed the growth of densely oriented zno nanorods with a. As a result of the three fastest growth directions,, and, and polar surface induced phenomena, a diverse group of zno nanostructures has been grown. Some of these applications include biomedical, energy, sensors, and optics.
Zinc oxide nanostructures for no 2 gassensor applications. Direct wafer bonding for nanostructure preparations. Shell nanostructures fabricated by replicating zno nano. We report here an electrodeposition route for the preparation of oriented and welldefined zno nanostructures by kinetically controlling the growth rates of various facets of the deposit by appropriate capping agents. A technique for producing hollow nanostructures of desired shape jun zhou school of materials science and engineering georgia institute of technology atlanta, ga 30332. Here we report a lowtemperature, environmentally benign, solutionbased approach for the preparation of complex and oriented zno nanostructures, and the systematic modification of their crystal morphology. Hydrothermal synthesis of zno nanostructures with controllable. Growth of zno nanostructures with controllable morphology using a facile green antisolvent method jiyao dong, yungjung hsu, david shanhill wong, and shihyuan lu, department of chemical engineering, national tsing hua university, hsinchu, taiwan 300, republic of china, and department of materials science and engineering, national chiao tung university. We developed a lowtemperature, environmentally benign, solutionbased method to prepare complex zno nanostructures. It can be predicted that zno is probably the richest family of nanostructures among all onedimensional. We demonstrated that adsorption of cl takes places preferentially onto the 0001 planes to hinder the crystal growth along the caxis, and results in the formation of platelet. The metallic nanocones are prepared by argon ion beam sputtering utilizing a capillaritron ion source.
Freestanding znocuo composite nanowire array films and. Room temperature deposition of crystalline nanoporous zno. Zinc oxide zno is a provocative material for applications in electronics, photonics, acoustics and sensing. Structural and optical properties of zno nano particles. It is noted that no obvious diffraction signal from the indium compound was observed, although there was about 20. Zinc oxide nanostructures for no gassensor applications. The application of zno nanobelts as nanosensors, nanocantilevers. More importantly, these zno nanostructures exhibit good structural and optical qualities and therefore. 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. Zno nanostructures grown on zinc nanocones by thermal. Zinc oxide nanoparticle is a unique material that exhibits itself as semiconductor and piezoelectricmaterial. The journal is focused on the objects rather than on their applications.
So the patterned seed layer sputtering for 10min is introduced to the hydrothermal growth of highly oriented zno nanostructure arrays. Shell nanostructures fabricated by replicating zno. Intense research by many different groups has focused on novel nanostructures with different shapes ranging from nanowires to nanobelts and even nanosprings. For producing zno nanostructures, a nitratebased precursor reaction with equimolar. Zno nanostructures, defects, and devices the interest in zno structures has increased drastically in recent years.
Other examples can be moths eyes have small bumps on its surface to absorb more visible light. Thus fabrication of zno based qdssc presents unique properties for electronics, optics, or photocatalysis 1215. Zinc oxides zno physical and chemical properties make it a viable and extremely attractive compound to use in a variety of nanotechnology applications. Synthesis and characterization of zno nanoparticles.
Using controlled seeded growth and citrate anions that selectively adsorb on zno basal planes as the structuredirecting agent, we prepared. Zno is an important widebandgap semiconducting ceramic material with many useful properties for. Xray diffraction xrd and selectedarea electron diffraction saed revealed hexagonal wurtzite crystal structure. So far, zno nanostructures have been synthesized by various physical and chemical methods, such as vaporliquidsolid, molecular beam epitaxy, and solution processes. Combination of zno and zns structures might obtain the merits of the two materials. Giri, department of physics, centre for nanotechnology, indian institute of technology guwahati, guwahati781 039, india. A variety of novel hierarchical nanostructures with 6, 4, and 2fold symmetries have been successfully grown by a vapor transport and condensation technique. The nanostructures could have novel applications in optoelectronics, sensors, transducers and biomedical sciences. Zno nanostructures ranging from smoothsurfaced nanorodnanowall networks with nonpolar 1100 and 1120 planes as side faces to corrugated, stacked pyramidstructured nanorods terminated mainly with opolar 1011 and 0001 planes. It was found that the major core nanowires are singlecrystal in2o3 with 6, 4, and 2 facets, and the secondary nanorods are singlecrystal hexagonal zno and grow either perpendicular on or slanted to all the facets of the core in2o3.
Dielectric properties of mn doped zno nanostructures. Zno nanowalls and nanocolumns grown by metalorganic. These unique nanostructures unambiguously demonstrate that zno is probably the richest family of nanostructures among all materials, both in structures and properties. It can be seen that the diffraction peak shows an obvious shift to a smaller angle of about 34. Home solid state phenomena nanoscience and technology shape evolution of zno nanostructures modified by.
Recently, znszno nanostructures emerged as components of novel solar cells and photodetectors. The journal is devoted to novel architectures at the nanolevel with an emphasis on new synthesis and characterization methods. The structures of zno nrs were synthesized by chemical bath deposition cbd method in aqueous solution of n 2 o 6 zn. Hierarchical assembly of sno 2 zno nanostructures for. However,uptonow, effective strategies for reliable and mass fabrication of composite nanostructures still remain a challenge. Nanostructures can be found in other insects, plants and other living organs. Sno2zno hierarchical heterostructures have been successfully synthesized by combining electrospinning technique and hydrothermal method. The aspect ratios of zinc nanocones are found to be dependent on ion beam energy and substrate temperatures. Nano express open access synthesis and field emission properties of different zno nanostructure arrays yaoguo fang1,2, kin mun wong1,2 and yong lei1,2 abstract in this article, zinc oxide zno nanostructures of different shapes were fabricated on silicon substrate. Solution phase synthesis and applications xiaoliang wang 1, mashkoor ahmad 2 and hongyu sun 3, id 1 college of science, hebei university of science and technology, shijiazhuang 050018, china 2 nanomaterials research group, physics division, pakistan institute of nuclear science and technology. Their magnetic properties and interaction with dna 5. The effect of zinc oxide zno thin film on the growth of zno nanorods nrs was investigated.
Zinc oxide zno in its nanostructured form is emerging as a promising material with great potential for the development of many smart electronic devices. Department of science and technology itn, campus norrkoping, linkoping university, se601 74 norrkoping, sweden. Zinc oxide zno nanostructures are one of the most promising photonic materials due to their wide band gap 3. Effect of zno nanopowder source and growth temperature on shape evolution of zno nanostructures soumen dhara and p. Modification at lattice scale for an optimized optical. Graphene oxideassisted morphology and structure of. This indicates that all the nanostructures with a different size and orientation. Various morphologies of the secondary zno nanostructures. Oriented morphogenesis of zno nanostructures from water. Figures 4c and 4d illustrate welloriented zno nanoparticle formed in 30 min when 1 g nh 3 h 2 o was added into the solution. Nano express open access synthesis and field emission. Comparing with previous reports,, in which citrate anions were used as structuredirecting agent to suppress the growth along caxis, our method is more easily operated to get oriented 2d zno nanostructures.
Please refer to the link below for more examples in nature. The core level xps spectra of zno nanostructures and auzno nanocomposites are shown in figure 4. Finetuning the synthesis of zno nanostructures by an alcohol. Crystal growth of nanostructured zinc oxide nanorods from. The strong peak corresponding to zno 002 is observed in each film, which indicates high axis oriented in all samples. Surface of a butterfly wings has multilayer nanoscale patterns which creates optical interferences. As indexed in the spectrum, all diffraction peaks match the hexagonal structure of wurtzite zno. Onedimensional zno nanostructures have great potential applications in the fields of optoelectronic and sensor devices. One of the zno nrs samples was deposited on a zno seed layer coated on a glass substrate to investigate the properties of.
Tian zr1, voigt ja, liu j, mckenzie b, mcdermott mj. Chapter 3 synthesis and characterization of zno nanoparticles. Zno nanowalls and nanocolumns grown by metalorganic chemical vapor deposition sangwoo kim 1,a, shizuo fujita 2, minsu yi3, hanki kim 1, beelyong yang 1, and dae ho yoon 4 1school of advanced materials and system engineering, kumoh national institute of technology, 1 yanghodong, gumi, gyeongbuk 730701, korea. The nanostructures could have novel applications in optoelectronics, sensors. In addition, most of the nanostructures need to be synthesized on the substrate because it provides a platform for deposition of. Multifunctional auzno plasmonic nanostructures for. Toward the optimization of lowtemperature solution. Furthermore, coreshell structured znozns have been proposed to improve physical and.