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Synthesis and characterization of ZnO/Graphene nanostructures for electronics and photocatalysis / Ebrahim Chalangar.

Chalangar, Ebrahim, 1984- (författare)
Pettersson, Håkan (preses)
Willander, Magnus, 1948- (preses)
Nour, Omer (preses)
Falconi, Christian (opponent)
Linköpings universitet. Institutionen för teknik och naturvetenskap (utgivare)
Alternativt namn: Linköping University. Department of Science and Technology
Alternativt namn: ITN
Linköpings universitet Tekniska fakulteten (utgivare)
Publicerad: Norrköping : Department of Science and Technology, Linköping University, 2021
Engelska 1 onlineresurs (xv, 128 sidor)
Serie: Linköping Studies in Science and Technology. Dissertations, 0345-7524 ; 2130
Läs hela texten (Sammanfattning och ramberättelse från Linköping University Electronic Press)
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  • E-bokAvhandling(Diss. (sammanfattning) Linköping : Linköpings universitet, 2021)
Sammanfattning Ämnesord
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  • Recent rapid development of electronics and electro-optical devices demands affordable and reliable materials with enhanced performance. Forming nanocomposites of already well-known materials is one possible route towards novel functional materials with desirable synergistic enhanced properties. Incompatible chemical properties, mismatched crystal structures and weak bonding interactions between the substances, however, often limit the number of possible nanocomposites. Moreover, using an inexpensive, facile, large-area and flexible fabrication technique is crucial to employ the new composites in industrially viable applications. This thesis focuses on the synthesis and characterization of different zinc oxide/graphene (ZnO/GR) nanocomposites, well suited for optoelectronics and photocatalysis applications. Two different approaches of i) substrate-free random synthesis, and ii) template-assisted selective area synthesis were studied in detail. In the first approach, ZnO nanoparticles/rods were grown on GR. The obtained nanocomposites were investigated for better GR dispersity, electrical conductivity and optical properties. Besides, by adding silver iodide to the nanocomposite, an enhanced plasmonic solar-driven photocatalyst was synthesized and analyzed. In the second approach, arrays of single, vertically aligned ZnO nanorods were synthesized using a colloidal lithography-patterned sol-gel ZnO seed layer. Our demonstrated nanofabrication technique with simple, substrate independent, and large wafer-scale area compatibility improved the alignment and surface density of ZnO nanorods over large selective growth areas. Eventually, we found a novel method to further enhance the vertical alignment of the ZnO nanorods by introducing a GR buffer layer between the Si substrate and the ZnO seed layer, together with the mentioned patterning technique. The synthesized nanocomposites were analyzed using a large variety of experimental techniques including electron microscopy, photoelectron spectroscopy, x-ray diffraction, photoluminescence and cathodoluminescence spectroscopy for in-depth studies of their morphology, chemical and optical properties. Our findings show that the designed ZnO/GR nanocomposites with vertically aligned ZnO nanorods of high crystalline quality, synthesized with the developed low-cost nanofabrication technique, can lead to novel devices offering higher performance at a significantly lower fabrication cost. 

Ämnesord

Kompositmaterial  (sao)
Nanoteknik  (sao)
Grafen  (sao)
Engineering and Technology  (hsv)
Materials Engineering  (hsv)
Composite Science and Engineering  (hsv)
Teknik och teknologier  (hsv)
Materialteknik  (hsv)
Kompositmaterial och -teknik  (hsv)
Nano Technology  (hsv)
Nanoteknik  (hsv)
Natural Sciences  (hsv)
Chemical Sciences  (hsv)
Materials Chemistry  (hsv)
Naturvetenskap  (hsv)
Kemi  (hsv)
Materialkemi  (hsv)
Physical Sciences  (hsv)
Condensed Matter Physics  (hsv)
Fysik  (hsv)
Den kondenserade materiens fysik  (hsv)
Nanotechnology  (lcsh)
Composite materials  (lcsh)
Graphene  (lcsh)

Genre

government publication  (marcgt)

Indexterm och SAB-rubrik

zinc oxide
graphene
nanostructure
nanocomposite
conjugated electronics
photocatalysis
nanofabrication
colloidal lithography
chemical bath deposition
sol-gel

Klassifikation

620.115 (DDC)
P.01 (kssb/8 (machine generated))
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