Optoelectronic properties of ZnO nanowires deposited under different zinc nitrate/hexamine ratio concentrations

We report the synthesis of ZnO nanowires grown on several substrates (PET, glass, and Si) using a two-step process: (a) preparation of the seed layer on the substrate by spin coating, from solutions of zinc acetate dihydrate and 1-propanol, and (b) growth of the ZnO nanostructures by dipping the substrate in an equimolar solution of zinc nitrate hexahydrate and hexamethylenetetramine. Subsequently, films were thermally treated with a commercial microwave oven (350 and 700 W) for 5, 20, and 35 min. The ZnO nanowires obtained were characterized structurally, morphologically, and optically using XRD, SEM, and UV-VIS transmission, respectively. XRD patterns spectra revealed the presence of Zn(OH)2on the films grown on glass and Si substrates. A preferential orientation alongc-axisdirections for films grown on PET substrate was observed. An analysis by SEM revealed that the growth of the ZnO nanowires on PET and glass is better than the growth on Si when the same growth parameters are used. On glass substrates, ZnO nanowires less than 50 nm in diameter and between 200 nm and 1200 nm in length were obtained. The ZnO nanowires band gap energy for the films grown on PET and glass was obtained from optical transmission spectra.

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Template Assisted Growth of Zinc Oxide-Based Nanowires and Piezoelectric Properties

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.829.757 ◽

2013 ◽

Vol 829 ◽

pp. 757-761 ◽

Cited By ~ 1

Author(s):

Nooshin Sadat Ayati ◽

Elahe Akbari ◽

Seyed Pirooz Marashi ◽

Shahyar Saramad

Keyword(s):

Zinc Oxide ◽

Zinc Nitrate ◽

Zno Nanowires ◽

Structure Characterization ◽

X Ray Diffraction ◽

Contact Mode ◽

Oxide Nanowires ◽

Nitrate Precursor ◽

Potentiostatic Electrodeposition

In this paper, we report on the synthesis of ZnO nanowires via templated electrochemical deposition. ZnO nanowire arrays were fabricated by potentiostatic electrodeposition in track-etched polycarbonate (PC) membrane. The electrolyte was aqueous solution containing zinc nitrate precursor. The electrodeposition process involves the electroreduction of nitrate ions to alter the local pH and precipitation of the metal oxide within the pores. The morphology analysis and structure characterization of the ZnO nanowires were carried out using conventional scanning electron microscopy (SEM) and X-Ray diffraction. To check the piezoelectric characteristics of the zinc oxide nanowires, the AFM microscope is used in contact mode. The scanned area was 5µm*5µm and the affected force was 30nN. In result of scanning each nanowire with conductive AFM tip in contact mode, a current peak which had a width smaller than topography peak was fabricated. This is due to semi-conductivity and piezoelectricity characteristics of Nanowires.

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Effect of Hydrothermal Solutions on Optical and Electrical Properties of ZnO Nanowires Grown on a ZnO:Al Seed Layer for Improved Mechanical Performance

Journal of Nanoelectronics and Optoelectronics ◽

10.1166/jno.2020.2748 ◽

2020 ◽

Vol 15 (3) ◽

pp. 307-315

Author(s):

H. Tugral Arslan ◽

Cuneyt Arslan ◽

N. Baydogan

Keyword(s):

Seed Layer ◽

Mechanical Performance ◽

Sol Gel ◽

Soda Lime ◽

Zinc Nitrate ◽

Zno Nanowires ◽

Hydrothermal Growth ◽

Optimal Size ◽

Zno Nanowire ◽

Seed Layers

ZnO nanowire arrays were fabricated by hydrothermal growth on Al-doped ZnO (ZnO:Al) seed layers coated on soda-lime silicate glass by sol–gel coating. The properties of the ZnO:Al seed layer were evaluated to obtain ZnO nanowires with the optimal size and length and to realize suitable adhesion of the ZnO:Al grains to the substrate. The optimal mechanical performance (adhesion and abrasion resistance) of the ZnO:Al seed layer was obtained at Al 1 at.%. The seed layers annealed between 400 and 500 C exhibited enhanced ZnO nanowire growth. Increasing the annealing temperature within this range improved the electrical and optical properties of the nanowires. Additionally, two chemical compounds, zinc acetate (ZA) and zinc nitrate (ZN), were used to compare the effects of the solution type on the hydrothermal growth. The nanowires grown in the ZA solution were thicker and had higher electrical conductivity compared to the ZN solution. The gamma transmission technique was used to determine the agglomeration of ZnO:Al nanospheres and to examine the crystallite size and density of the ZnO:Al seed layers.

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ZnO nanowires growth direction and parameters affecting their surface morphology

10.5772/intechopen.80538 ◽

2021 ◽

Author(s):

Shrok Allami

Keyword(s):

Surface Morphology ◽

Material Properties ◽

Bath Temperature ◽

Growth Direction ◽

Nucleation And Growth ◽

Zinc Nitrate ◽

Zno Nanowires ◽

Growth Solution ◽

Nanowires Growth ◽

Unique Material

ZnO nanowires (or nanorods) have been widely studied due to their unique material properties and remarkable performance in electronics, optics, and photonics. This chapter presents a review of the current research of ZnO nanowires (or nanorods) synthesized by hydrothermal method. We discussed the mechanism of its nucleation and growth taking the effect of different parameters on its growth direction and their final morphology into account. A mixture of zinc nitrate and hexamine as precursor is the most popular. We reported the effect of precursor type and concentration, pH of the growth solution, bath temperature, substrate type and seeded layer, and duration time.

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DNA - Directed Synthesis of ZnO Nanowires

MRS Proceedings ◽

10.1557/proc-1094-dd03-08 ◽

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.

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Enhanced optoelectronic properties of thermally evaporated Sb-doped ZnO nanowires via defect structures

AIP Advances ◽

10.1063/1.5118813 ◽

2019 ◽

Vol 9 (12) ◽

pp. 125019 ◽

Cited By ~ 1

Author(s):

Chih-Chiang Wang ◽

Wei-Chen Lin ◽

Fuh-Sheng Shieu ◽

Han C. Shih

Keyword(s):

Zno Nanowires ◽

Optoelectronic Properties ◽

Defect Structures ◽

Doped Zno

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Impact of seed layer annealing on the optoelectronic properties of double-step CBD grown n-ZnO nanowires/p-Si heterojunctions

Optik ◽

10.1016/j.ijleo.2020.166141 ◽

2021 ◽

Vol 228 ◽

pp. 166141

Author(s):

Somdatta Paul ◽

Jenifar Sultana ◽

Nayan Ranjan Saha ◽

Goutam K. Dalapati ◽

Anupam Karmakar ◽

...

Keyword(s):

Seed Layer ◽

Zno Nanowires ◽

Optoelectronic Properties ◽

Double Step

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Synthesis and Characterization of Zinc Oxide Nanowires Grown Hydrothermally on Glass Substrate

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.787.427 ◽

2013 ◽

Vol 787 ◽

pp. 427-431

Author(s):

Concepción Mejía-García ◽

Elvia Díaz-Valdéz ◽

M.A. Ayala-Torres ◽

J. Romero-Labias ◽

M.G. de La Cruz-Vicencio ◽

...

Keyword(s):

Seed Layer ◽

Zinc Nitrate ◽

Microwave Oven ◽

Zno Nanowires ◽

Bandgap Energy ◽

Nitrate Hexahydrate ◽

Oxide Nanowires ◽

Electron Microscopy Analysis ◽

Microscopy Analysis ◽

Xrd Patterns

We report the synthesis of ZnO nanowires grown on glass using a two-step process: (a) preparation of the seed layer, and (b) growth of the nanostructures. First step:solutions of zinc acetate dehydrate and 1-propanol of 10 mM concentrationwere spin coated on glass at 2000 rpm for 58 s. A seed layer was obtained after three layers of spin coating. Second step: vertical ZnO nanowires were grown by dipping the substrate in a 25 mMequimolarsolution of zinc nitrate hexahydrate and hexamethylenetetramine. Subsequently, films were thermally treated with a commercial microwave oven at different power settings (350 and 700 W) for 5, 20 and 35 min. The ZnO nanowires obtained were characterized optical and morphologically. Scanning electron microscopy analysis showed that the size of ZnO nanowires was less than 50 nm in diameter and around 500 nm in length. XRD patterns revealed that when low power in the microwave oven was utilized, the presence of Zn (OH)2 on the films is observed. The ZnO nanowires bandgap energy was obtained from optical transmission spectra.

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