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Anions effect on the low temperature growth of ZnO nanostructures
Linköpings universitet, Institutionen för teknik och naturvetenskap, Fysik och elektroteknik. Linköpings universitet, Tekniska högskolan.
National Centre for Physics, Quaid-e-Azam University Campus, Islamabad, Pakistan .
Linköpings universitet, Institutionen för teknik och naturvetenskap. Linköpings universitet, Tekniska högskolan.
Linköpings universitet, Institutionen för teknik och naturvetenskap, Fysik och elektroteknik. Linköpings universitet, Tekniska högskolan.
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2012 (Engelska)Ingår i: Vacuum, ISSN 0042-207X, E-ISSN 1879-2715, Vol. 86, nr 12, s. 1998-2001Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Seed mediated aqueous chemical growth (ACG) route was used for the growth of ZnO nanostructures on Si substrate in four different growth mediums. The growth medium has shown to affect the morphology and the size of the different nanostructures. We observed that the medium containing zinc nitrate anions yields the nanorods, in a medium containing zinc acetate anions nano-candles are obtained. While in a medium containing zinc chloride anions ZnO nano-discs were obtained and in a medium containing zinc sulfate anions nano-flakes are achieved. Growth in these different mediums has also shown effect on the optical emission characteristics of the different ZnO nanostructures.

Ort, förlag, år, upplaga, sidor
Elsevier , 2012. Vol. 86, nr 12, s. 1998-2001
Nyckelord [en]
ZnO, Chemical growth, Nanostructures, Optical properties
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
URN: urn:nbn:se:liu:diva-84909DOI: 10.1016/j.vacuum.2012.05.020ISI: 000308672000041OAI: oai:DiVA.org:liu-84909DiVA, id: diva2:562901
Tillgänglig från: 2012-10-26 Skapad: 2012-10-26 Senast uppdaterad: 2018-02-16
Ingår i avhandling
1. The synthesis, characterization and device fabrication of ZnO, NiO and their composite nanostructures
Öppna denna publikation i ny flik eller fönster >>The synthesis, characterization and device fabrication of ZnO, NiO and their composite nanostructures
2014 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Electronics industry has been revolutionized since last few decades because of the fabrication of electronic devices by using nanoscale based materials. But the more innovative feature in the electronic devices is the use of transparent materials, which makes the transparent electronic devices as one of the most interesting research field in nanoscience and nano-technology now a days. In order to have high performance electronic devices based on the wide band gap compound semiconductors, a selection of right transparent material is crucial step. Among all the transparent metal oxides, ZnO is one of the potential candidates due to the ease in the synthesis process, wide bandgap of 3.37 eV, a high exciton binding energy of 60 meV and diverse morphologies. Since p-type ZnO based nanodevices are still difficult to fabricate due to the instability and unreliability of p-type ZnO nanomaterial, therefore several p-type semiconductors are used for the development of p-n junctions. Among those NiO is suitable p-type compound semiconductor to make p-n junction with ZnO because of its wide band gap of 3.7 eV and environment friendly conditions for its synthesis. Keeping these attractive properties of n-type ZnO and p-type NiO, the synthesis of composite nanostructures of these two transparent oxides and fabrication of their electronic devices is presented in this dissertation work.

I started my work with the synthesis of ZnO nanostructures focusing on the effect of different anions of zinc salts on the morphology and crystallinity of ZnO nanostructures. Then I grow honey-comb like NiO nanostructures on 3D nickel foam and used these nanostructures for the detection of Zinc ion. After that synthesized NiO and ZnO based composite nanostructures and characterized them, having main focus on the luminescence properties of ZnO when decorated with NiO nanostructures. The composite nanostructures of p-type NiO and n-type ZnO showed enhancement in the luminescence properties. Since pn junction is the back bone of electronic devices so working on the designing of band alignment along with the current transport properties of p-type NiO/n-type ZnO composite structures, an attempt was put forwarded to explain the phenomenon of these compound semiconducting materials. Different devices based on these two compound semiconducting materials are fabricated and designed in the present dissertation work, however still more work is required to improve the efficiency of devices like LEDs and UV detectors.

Ort, förlag, år, upplaga, sidor
Linköping: Linköping University Electronic Press, 2014. s. 55
Serie
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1562
Nyckelord
Zinc oxide; Nickel Oxide; Composite nanostructures; Wide band gap; Low temperature growth; Luminescence, Photo-detector; Light emitting diode
Nationell ämneskategori
Naturvetenskap
Identifikatorer
urn:nbn:se:liu:diva-103343 (URN)
Disputation
2014-01-24, Kåkenhus, Campus Norrköping, Linköpings universitet, Norrköping, 10:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2014-01-17 Skapad: 2014-01-17 Senast uppdaterad: 2014-09-18Bibliografiskt granskad

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