scholarly journals Prediction of Surface Plasmon Resonsnce and More Accurate Representation of Absorption Features Both Below and Above the Bandgap in ZnO Nanorods array – Au Heterostructures

2021 ◽  
Author(s):  
Mahla Qaemi ◽  
Abdollah Hasanzadeh
Keyword(s):  
Optical Absorption ◽  
Surface Plasmon ◽  
Wide Spectrum ◽  
Zno Nanorods ◽  
Green Laser ◽  
Blue Laser ◽  
Zinc Oxide Nanorods ◽  
Bandgap Energy ◽  
Laser Exposure ◽  
X Ray

Abstract Well-oriented zinc oxide nanorods (ZnO NRs) arrays have been grown by low temperature chemical bath deposition on seeded substrates. A gold thin film has obliquely been deposited by DC magnetron sputtering on the ZnO NRs array. The structure, mophology/ chemical identity, vibrational identity have been studied by X-ray diffraction (XRD), field effect- scanning electron microscope/ energy dispersive X-ray spectroscopy (FE-SEM/EDX) and Raman spectroscopy, respectively. The FCC structure of Au is formed on vertically oriented ZnO NRs-array. The wavelength dependent photocurrent of ZnO NRs array-Au heteronanostructure (HNS) was evaluated by photogain response under red, green and blue laser illuminations. Surface plasmon excitation activates selective response to green laser exposure. An analytical dispersion formalism has been constructed to fit experimental absorption spectrum over wide spectrum range and to extract precise bandgap energy, subband tailing, dielectric constant and carrier effective mass. The proposed model exploits the Frouhi–Bloomer (FB) parameterization and Gaussian oscillator dispersion to the complex dielectric function for Au decorated ZnO NRs array. Sharp variation in the optical absorption around the bandgap edge and the absorption behavior beyond the bandgap edge are covered as well. It is surprising that the surface plasmon resonance (SPR) is included without new formalism. The new model has been satisfactorily tested on CuO optical absorption.

Fabrication and Material Analysis of Zinc Oxide Nanorods Grown on Gallium Nitride Substrate

2016 ◽  
Vol 19 (4) ◽  
pp. 181-183 ◽  
Author(s):  
Tzu-Yi Yu ◽  
Yi Cian Chen ◽  
Wang Ting Chiu ◽  
Yang Luo ◽  
Sheng Shin Wang ◽  
...  
Keyword(s):  
Au Nanoparticles ◽  
Zno Nanorods ◽  
Nano Particles ◽  
Zinc Oxide Nanorods ◽  
X Ray Diffraction ◽  
Thermal Methods ◽  
X Ray ◽  
Oxide Nanorods ◽  
Different Temperatures ◽  
Multiple Material

In this study, we address process how the ZnO nanorods were deposited on GaN substrates with spin-coating by using the hydro-thermal methods. After ZnO was spin coated, the samples were annealed with different temperatures to incorporate with Au nano particles. Multiple material analyses, such as the field emission scanning electron microscopy (FESEM), the energy dispersive X-ray spectroscopy (EDX) and the X-ray diffraction (XRD) analyses were carried out to characterize the Au nanoparticles/ZnO nanorods/GaN nanocomposites.

Zinc Oxide Nanorods Characteristics Prepared by Sol-Gel Immersion Method Immersed at Different Times

2013 ◽  
Vol 667 ◽  
pp. 375-379 ◽  
Author(s):  
M. Awalludin ◽  
Mohamad Hafiz Mamat ◽  
Mohd Zainizan Sahdan ◽  
Z. Mohamad ◽  
Mohamad Rusop
Keyword(s):  
Electron Microscopy ◽  
Zinc Oxide ◽  
Immersion Time ◽  
Sol Gel ◽  
Zno Nanorods ◽  
Zinc Oxide Nanorods ◽  
Immersion Method ◽  
X Ray ◽  
Oxide Nanorods ◽  
Scanning Electron

This paper focus on zinc oxide (ZnO) nanorods prepared using sol-gel immersion method immersed at different time. Immersion times have been varied 1~24 hr and the characteristics of each sample have been observed. The effects of immersion time on ZnO nanorods thin films have been studied in surface morphology and structural properties using Scanning Electron Microscopy (SEM) and X-ray diffractometer (XRD), respectively.

Enhanced Antibacterial Activity by Au Nanoparticle Decorated ZnO Nanorods

2016 ◽  
Vol 675-676 ◽  
pp. 113-116
Author(s):  
Kanya Sornsanit ◽  
Mati Horprathum ◽  
Pitak Eiamchai ◽  
Chanunthorn Chananonnawathorn ◽  
Sukon Kalasung ◽  
...  
Keyword(s):  
Antibacterial Effect ◽  
Zno Nanorods ◽  
Average Diameter ◽  
Zinc Oxide Nanorods ◽  
Au Nanoparticle ◽  
Dc Magnetron Sputtering ◽  
Au Nps ◽  
X Ray ◽  
Oxide Nanorods ◽  
Scanning Electron

Gold nanoparticles (Au NPs) decorated on zinc oxide nanorods (ZnO NRs) arrays by combining hydrothermal method toward ZnO nanorods template and subsequent decoration on Au NPs on the ZnO surfaces by DC magnetron sputtering. The hybrids Au NPs-ZnO NRs were characterized using field-emission scanning electron microscopy and energy-dispersive X-ray spectroscopy. The average diameter and length of ZnO NRs template were estimate at 80 and 430 nm, respectively. In addition, antibacterial tests confirmed that adding Au NPs enhances antibacterial effect.

scholarly journals Structural and Optical Properties of ZnO Nanorods Thin Films Prepared Using Hydrothermal Technique and Effect of growth time

2020 ◽  
Vol 12 (02) ◽  
pp. 76-88
Author(s):  
Ahmed S. Abed ◽  
◽  
Sattar J. Qasim ◽  
Abbas F. Abbas ◽  
Keyword(s):  
Optical Properties ◽  
Zno Nanorods ◽  
Band Gap Energy ◽  
Zinc Oxide Nanorods ◽  
Morphological Properties ◽  
Growth Time ◽  
X Ray Diffraction ◽  
Hydrothermal Technique ◽  
X Ray ◽  
Oxide Nanorods

This paper describes, Synthesis of zinc oxide nanorods (ZnO NRs) using hydrothermal technique at different growth time. The structural and morphological properties were characterized by X-ray diffraction (XRD), Energy Dispersive X-Ray (EDX) and Field Emission Scanning Electron Microscope (FE-SEM). The ZnO NRs were obvious hexangular wurtzite structure and preferentially oriented along the c-axis (002) and growth vertically to the substrates. The optical properties were studied. From UV-Visible spectrophotometer and Photoluminescence (PL), the optical band gap energy of all ZnO NRs samples (S1, S2 and S3) were calculated to be (3.425 eV, 3.4 eV, 3.425 eV) respectively. Also, the effect of growth time on ZnO nanorods was studied.

scholarly journals Pengamatan Surface Plasmon Resonance pada ZnO Nanorods dengan Menggunakan Konfigurasi Prisma/Au/ZnO

2020 ◽  
Vol 23 (1) ◽  
pp. 27
Author(s):  
Rina Dewi Mayasari ◽  
Ajeng Novita Sari ◽  
Aditya Eka Mulyono ◽  
Agus Setyo Budi ◽  
Ratno Nuryadi
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Zno Nanorods ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
X Ray Diffraction ◽  
X Ray ◽  
20 Nm ◽  
Scanning Electron

Pengamatan fenomena surface plasmon resonance (SPR) telah berhasil dilakukan pada ZnO nanorods yang ditumbuhkan di atas lapisan tipis emas. Sistem SPR menggunakan konfigurasi Kretschmann termodifikasi dimana permukaan prisma dideposisi dengan lapisan tipis emas dan ZnO nanorods (prisma/Au/ZnO). Penumbuhan ZnO nanorods menggunakan metode hidrotermal dengan dua tahapan, yaitu pelapisan ZnO seed dan penumbuhan rods. Waktu penumbuhan divariasikan selama 5 menit, 2 jam, dan 4 jam, pada suhu 95 °C yang diikuti dengan annealing pada suhu 500 °C selama 1 jam. Struktur ZnO dikarakterisasi dengan X-ray diffraction (XRD), field emission scanning electron microscope - energy dispersive X-ray spectroscopy (FESEM-EDS), serta diamati fenomena SPR melalui grafik attenuated total reflection (ATR). Hasil karakterisasi menunjukkan bahwa ZnO nanorods (2 jam dan 4 jam) memiliki struktur kristal heksagonal dengan distribusi ukuran diameter pada rentang 20 nm – 60 nm. Fenomena SPR hanya teramati pada nanopartikel ZnO (5 menit) pada sudut SPR (θSPR) 58,2°. Fenomena SPR tidak terlihat pada ZnO nanorods (2 jam dan 4 jam) dikarenakan panjang rods melebihi 100 nm.

Application of cadmium-doped ZnO for the solar photocatalytic degradation of phenol

2019 ◽  
Vol 79 (2) ◽  
pp. 375-385 ◽  
Author(s):  
Behzad Shahmoradi ◽  
Farzaneh Farahani ◽  
Shadi Kohzadi ◽  
Afshin Maleki ◽  
Mohammadamin Pordel ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Irradiation Time ◽  
Zno Nanorods ◽  
Bandgap Energy ◽  
Phenol Removal ◽  
Operational Parameters ◽  
Sem Images ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Ft Ir

Abstract In this study, photocatalysis of phenol was studied using Cd-ZnO nanorods, which were synthesized by a hydrothermal method. The Cd-ZnO photocatalyst was characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy, and Fourier transform infrared (FT-IR) and UV-Vis spectroscopy. XRD patterns exhibit diffraction peaks indexed to the hexagonal wurtzite structures with the P63mc space group. SEM images showed that the average size of the Cd-ZnO nanorods was about 90 nm. Moreover, the nanorods were not agglomerated and were well-dispersed in the aqueous medium. FT-IR analysis confirmed that a surface modifier (n-butylamine) did not add any functional groups onto the Cd-ZnO nanorods. The dopant used in this study showed reduction of the bandgap energy between valence and conduction of the photocatalyst. In addition, effect of various operational parameters including type of photocatalyst, pH, initial concentration of phenol, amount of photocatalyst, and irradiation time on the photocatalytic degradation of phenol has been investigated. The highest phenol removal was achieved using 1% Cd-ZnO for 20 mg/l phenol at pH 7, 3 g/l photocatalyst, 120 min contact time, and 0.01 mole H2O2.

Influence of Solution Temperature for Hydrothermally Grown Zinc Oxide Nanorods

2014 ◽  
Vol 925 ◽  
pp. 385-389
Author(s):  
Kalyani Nadarajah ◽  
Yern Chee Ching
Keyword(s):  
Zno Nanorods ◽  
Growth Direction ◽  
Emission Peak ◽  
Zinc Oxide Nanorods ◽  
Solution Temperature ◽  
X Ray Diffraction ◽  
X Ray ◽  
Aligned Arrays ◽  
Uv Emission ◽  
Oxide Nanorods

Well-aligned arrays of vertically oriented ZnO nanorods were synthesized using hydrothermal method using equal molar concentration of zinc acetate hexahydrate (Zn (CH3COO)2.6H2O) and hexamethylenetetramine (C6H12N4) at various deposition temperatures. The resulting nanorods were analyzed by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), photoluminescence (PL), and UV-vis spectrophotometer. XRD and FESEM results indicate that the crystallinity improved for nanorods grown at 85 °C. The preferred growth direction of these nanorods is in (002) direction. However, the nanorods were grown at 55 °C shows poor crystalline characteristics. Typically, these nanorods have grown up to 1000 nm with the diameter range of 25-50 nm. The obtained ZnO nanorods exhibit a weaker UV emission peak located around ~380-390 nm and a relatively stronger yellow-red emission band located at 625 nm to 675 nm.

scholarly journals Orange/Red Photoluminescence Enhancement Upon SF6 Plasma Treatment of Vertically Aligned ZnO Nanorods

Nanomaterials ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 794 ◽  
Author(s):  
Amine Achour ◽  
Mohammad Islam ◽  
Sorin Vizireanu ◽  
Iftikhar Ahmad ◽  
Muhammad Aftab Akram ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Plasma Treatment ◽  
Zno Nanorods ◽  
Hydrothermal Process ◽  
Zinc Oxide Nanorods ◽  
Hydroxyl Group ◽  
Yellow Emission ◽  
X Ray ◽  
Vertically Aligned ◽  
Pl Emission

Although the origin and possible mechanisms for green and yellow emission from different zinc oxide (ZnO) forms have been extensively investigated, the same for red/orange PL emission from ZnO nanorods (nR) remains largely unaddressed. In this work, vertically aligned zinc oxide nanorods arrays (ZnO nR) were produced using hydrothermal process followed by plasma treatment in argon/sulfur hexafluoride (Ar/SF6) gas mixture for different time. The annealed samples were highly crystalline with ~45 nm crystallite size, (002) preferred orientation, and a relatively low strain value of 1.45 × 10−3, as determined from X-ray diffraction pattern. As compared to as-deposited ZnO nR, the plasma treatment under certain conditions demonstrated enhancement in the room temperature photoluminescence (PL) emission intensity, in the visible orange/red spectral regime, by a factor of 2. The PL intensity enhancement induced by SF6 plasma treatment may be attributed to surface chemistry modification as confirmed by X-ray photoelectron spectroscopy (XPS) studies. Several factors including presence of hydroxyl group on the ZnO surface, increased oxygen level in the ZnO lattice (OL), generation of F–OH and F–Zn bonds and passivation of surface states and bulk defects are considered to be active towards red/orange emission in the PL spectrum. The PL spectra were deconvoluted into component Gaussian sub-peaks representing transitions from conduction-band minimum (CBM) to oxygen interstitials (Oi) and CBM to oxygen vacancies (VO) with corresponding photon energies of 2.21 and 1.90 eV, respectively. The optimum plasma treatment route for ZnO nanostructures with resulting enhancement in the PL emission offers strong potential for photonic applications such as visible wavelength phosphors.

Synchrotron x-ray scattering of ZnO nanorods: Periodic ordering and lattice size

2005 ◽  
Vol 20 (4) ◽  
pp. 1033-1041 ◽  
Author(s):  
Zuoming Zhu ◽  
Tamar Andelman ◽  
Ming Yin ◽  
Tsung-Liang Chen ◽  
Steven N. Ehrlich ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Small Angle ◽  
Self Assembly ◽  
Zno Nanorods ◽  
Zinc Oxide Nanorods ◽  
Wide Angle ◽  
Zinc Oxide Nanostructures ◽  
Synthesis Time ◽  
X Ray ◽  
Precursor Ratio

We demonstrate that synchrotron x-ray powder diffraction (XRD) is a powerful technique for studying the structure and self-organization of zinc-oxide nanostructures. Zinc-oxide nanorods were prepared by a solution-growth method that resulted in uniform nanorods with 2-nm diameter and lengths in the range 10–50 nm. These nanorods were structurally characterized by a combination of small-angle and wide-angle synchrotron XRD and transmission electron microscopy (TEM). Small-angle XRD and TEM were used to investigate nanorod self-assembly and the influence of surfactant/precursor ratio on self-assembly. Wide-angle XRD was used to study the evolution of nanorod growth as a function of synthesis time and surfactant/precursor ratio.

OPTICAL ABSORPTION OF SOLID NEON AND ARGON IN THE SOFT X-RAY REGION

1971 ◽  
Vol 32 (C4) ◽  
pp. C4-236-C4-240 ◽  
Author(s):  
R. HAENSEL ◽  
G. KEITEL ◽  
N. KOSUCH ◽  
U. NIELSEN ◽  
P. SCHREIBER
Keyword(s):  
Optical Absorption ◽  
X Ray
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