Functionalization of Au Nanoparticles on ZnO Nanorods through Low-Temperature Synthesis

2016 ◽  
Vol 675-676 ◽  
pp. 45-48 ◽  
Author(s):  
Sukon Kalasung ◽  
A. Kopwitthaya ◽  
M. Horprathum ◽  
J. Kaewkhao ◽  
S. Tuscharoen ◽  
...  
Keyword(s):  
Silicon Wafer ◽  
Au Nanoparticles ◽  
Hydrothermal Reaction ◽  
Zno Nanorods ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Au Nps ◽  
X Ray ◽  
Wafer Substrate ◽  
The Difference

Hybrid nanomaterials exhibit multi-functionalities, which is synergy or enhanced physical and optical properties over their single components with promising potentials for various applications in dye-sensitized solar cell and photocatalytic materials. In this present research, the Au nanoparticles were prepared at HAuCl4 concentration of 0.5 mM on ZnO nanorod templates and silicon wafer substrate by hydrothermal reaction process. The prepared samples were investigated the crystal structure, chemical composition and morphologies by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS) and field-emission scanning electron microscopy (FESEM), respectively. The XRD results shown that ZnO was preferred orientation along the c-axis (002). The FE-SEM images indicated to the difference of size-Au NPs decorated on ZnO nanorods and silicon wafer. The relationship between the surface area and the size of Au NPs of the prepared samples was investigated and possible growing mechanism of Au NPs on ZnO nanorods templates will be discussed.

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.

Preparation and Spectral Properties of PVP-Modified ZnO Nanorods

2008 ◽  
Vol 368-372 ◽  
pp. 329-332 ◽  
Author(s):  
Yang Feng Huang ◽  
Han Ning Xiao ◽  
Shu Guang Chen
Keyword(s):  
Electron Microscopy ◽  
Hydrothermal Reaction ◽  
Uv Spectroscopy ◽  
Zno Nanorods ◽  
X Ray Diffraction ◽  
X Ray ◽  
Uv Emission ◽  
Transmission Electron ◽  
Light Region ◽  
Uv Absorption Spectrum

ZnO nanorods were prepared by a hydrothermal reaction in the presence or absence of PVP (polyvinyl pyrrolidone). The obtained products were characterized by means of X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared, UV-Vis absorption (UV) spectroscopy and photoluminescence (PL) spectroscopy. The results suggest that PVP plays an important role in the preparation of ZnO nanorods. The UV absorption spectrum showed PVP increases the UV-shielding ability but doesn’t influence the transparency in the visible light region. A weak UV emission at 353 nm of PL spectra exhibit the surface of ZnO nanorods is passivated and oxygen-related defects is supplied by PVP.

Influence of Growth Conditions on Morphology of ZnO Nanorods by Low-Temperature Hydrothermal Method

2016 ◽  
Vol 675-676 ◽  
pp. 53-56
Author(s):  
Supawadee Pokai ◽  
Puenisara Limnonthakul ◽  
Mati Horprathum ◽  
Sukon Kalasung ◽  
Pitak Eiamchai ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Hydrothermal Method ◽  
Zno Nanorods ◽  
Cost Effective ◽  
Growth Conditions ◽  
Growth Time ◽  
Thermoelectric Device ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray

Zinc oxide (ZnO) nanorods (NRs) promise high potentials in several applications, such as photovoltaic device, thermoelectric device, sensor and solar cell. In this research, the vertical alignment of ZnO NRs was fabricated by hydrothermal method with various precursor concentrations and growth time on different seed layers (ZnO and Au), which deposited on silicon wafer substrate (100). The crystalline structure and morphology of ZnO NRs have been characterized by x-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM) techniques, respectively. The x-ray diffraction pattern shows that the prepared samples have a strong preferred orientation (002) plane. FE-SEM images of the ZnO NRs, it found that the density and aspect ratio were strongly influenced by the seed layer and precursor concentration. In addition, the aspect ratio of ZnO NRs was increased with increasing growth time. This study provides a cost effective method for the fabrication of well aligned ZnO NRs for nano-electronic devices.

Investigation on structure of BaTi1−x NbxO3 compound prepared by rotary-hydrothermal synthesis methods

2014 ◽  
Vol 32 (3) ◽  
pp. 430-435 ◽  
Author(s):  
Arsia Khanfekr ◽  
Morteza Tamizifar ◽  
Rahim Naghizadeh
Keyword(s):  
Electron Microscope ◽  
Hydrothermal Reaction ◽  
Phase Evolution ◽  
Synthesis Methods ◽  
Structure And Properties ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray ◽  
Transmission Electron ◽  
Diffraction Patterns

AbstractBaTi1−x NbxO3 compounds (with x = 0.0, 0.01, 0.03, 0.06, and 0.09) were synthesized by rotary-hydrothermal (RH) method. The process was conducted at 180 °C for 5 hours in a Teflon vessel that was rotated at a speed of 160 rpm during the hydrothermal reaction. The effects of donor concentration on the structure and properties of BaTi1−x NbxO3 compounds were investigated. The experiments for the BaTiO3±Nb2O3 system produced by a solid state reaction at high temperature at different concentrations of niobium, with the use of RH processing have not been reported in previous works. For the phase evolution studies, X-ray diffraction patterns (XRD) were analyzed and Raman spectroscopy measurements were performed. The transmission electron microscope (TEM) and the field emission scanning electron microscope (FE-SEM) images were taken for the detailed analysis of the grain size, surface and morphology of the compound.

scholarly journals Synthesis of ZnO nanorods on ZnO/ITO seed layer by electrochemical method and its application in solar cell device

2013 ◽  
Vol 16 (4) ◽  
pp. 5-12
Author(s):  
Hoang Cao Son Tran ◽  
Khac Top Le ◽  
Duc Hao Nguyen ◽  
Thi Dong Tri Nguyen ◽  
Kien Quoc Luu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Electrochemical Method ◽  
Zno Nanorods ◽  
Hybrid Solar Cells ◽  
X Ray Diffraction ◽  
Solar Cell Device ◽  
Sem Images ◽  
X Ray ◽  
Stable Flow

In this paper, we study on the effects of ZnO nanorods /seed ZnO on properties of hybrid solar cells. ZnO nanorods fabricated by electrochemical method of two-step stable flow of liquid Zn(NO3)2. 6H2O (0.005 M) and C6H12N4 (0.005 M). Morphology and optoelectronic properties of ZnO nanorods were studied by SEM images, UV-VIS transmission spectra, X-ray diffraction and photoluminescence spectrum. Elaboration of hybrid solar cells by inserting ZnO nanorods on organic photoactive layer of P3HT:PCBM and ITO, as result the solar cell conductivity performance is significantly improved. Experimental results show that ~ 1,392 mA/cm2 Jsc, Voc ~ 0.49 V, FF = 0.32, and PCE = 0.23%.

scholarly journals ZnO (Ag-N) Nanorods Films Optimized for Photocatalytic Water Purification

Coatings ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 767 ◽  
Author(s):  
Luis Sanchez ◽  
Carlos Castillo ◽  
Willy Cruz ◽  
Bryan Yauri ◽  
Miguel Sosa ◽  
...  
Keyword(s):  
Nitrogen Content ◽  
Seed Layer ◽  
Zno Nanorods ◽  
Metallic Silver ◽  
Silver Nanostructures ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray ◽  
Mean Diameter ◽  
The Mean

ZnO nanorods (NRs) films, nitrogen-doped (ZnO:N), and ZnO doped with nitrogen and decorated with silver nanostructures (ZnO:N-Ag) NRs films were vertically supported on undoped and N doped ZnO seed layers by a wet chemical method. The obtained films were characterized structurally by X-ray diffraction. Morphological and elemental analysis was performed by scanning electron microscopy, including an energy dispersive X-ray spectroscopy facility and their optical properties by Ultraviolet-Visible Spectroscopy. Analysis performed in the NRs films showed that the nitrogen content in the seed layer strongly affected their structure and morphology. The mean diameter of ZnO NRs ranged from 70 to 190 nm. As the nitrogen content in the seed layer increased, the mean diameter of ZnO:N NRs increased from 132 to 250 nm and the diameter dispersion decreased. This diameter increase occurs simultaneously with the incorporation of nitrogen into the ZnO crystal lattice and the increase in the volume of the unit cell, calculated using the X-ray diffraction patterns and confirmed by a slight shift in the XRD angle. The diffractograms indicated that the NRs have a hexagonal wurtzite structure, with preferential growth direction along the c axis. The SEM images confirmed the presence of metallic silver in the form of nanoparticles dispersed on the NRs films. Finally, the degradation of methyl orange (MO) in an aqueous solution was studied by UV-vis irradiation of NRs films contained in the bulk of aqueous MO solutions. We found a significant enhancement of the photocatalytic degradation efficiency, with ZnO:N-Ag NRs film being more efficient than ZnO:N NRs film, and the latter better than the ZnO NRs film.

Preparation and Characterization of MoS2 Microsphere by Hydrothermal Method

2013 ◽  
Vol 631-632 ◽  
pp. 306-309 ◽  
Author(s):  
Ya Ru Cui ◽  
Jiang Shan He ◽  
Xiao Ming Li ◽  
Jun Xue Zhao ◽  
Ao Li Chen ◽  
...  
Keyword(s):  
Self Assembly ◽  
Hydrothermal Reaction ◽  
Average Diameter ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Ammonium Heptamolybdate ◽  
X Ray ◽  
Influence Mechanism ◽  
Dispersing Agent

In this work, MoS2 microsphere was synthesized by hydrothermal reaction, in which thiourea (CS(NH2)2) was used as S-source and reducing agent, ammonium heptamolybdate ((NH4)6Mo7O24.4H2O) was used as Mo-source. The influence of temperature, as well as different dispersing agents, on the reaction product’s morphology, structure and phase composition was discussed. X-ray diffraction results show that all the as-synthesized products are the hexagonal 2H-MoS2 without impurity. SEM images of the as-prepared MoS2 samples without adding any dispersing agent present spherical morphology with sheet-like structures shaped on the surface. A possible formation mechanism of the MoS2 microsphere is that of self-assembly growth process; In addition, for the samples adding surfactant CTAB, SDBS or PVP in the reactants, the MoS2 is confined to layered structure. Compared with SDBS and PVP, CTAB has the best dispersion effect which ensure the as-synthesized microsphere with about 300nm average diameter, and the influence mechanism of which can be deduced as electrostatic interaction and stereo-hindrance effect.

Gas Sensor Properties of ZnO Nanorods Grown by Chemical Bath Deposition

2014 ◽  
Vol 975 ◽  
pp. 189-193 ◽  
Author(s):  
Gisane Gasparotto ◽  
Talita Mazon ◽  
Gisele Gasparotto ◽  
Maria Aparecida Zaghete ◽  
Leinig Antonio Perazolli ◽  
...  
Keyword(s):  
Gas Sensor ◽  
Chemical Bath Deposition ◽  
Gas Sensors ◽  
Au Nanoparticles ◽  
Gas Sensing ◽  
Zno Nanorods ◽  
X Ray Diffraction ◽  
X Ray ◽  
Type Semiconductor ◽  
Sensor Properties

The present work shows a study about the growing of ZnO nanorods by chemical bath deposition (CBD) and its application as gas sensor. It was prepared ZnO nanorods and Au decorated ZnO nanorods and the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and gas sensing response measurements. The results obtained by XRD show the growth of ZnO phase. It was possible to observe the formation of uniform dense well-aligned ZnO nanorods. The results obtained also revealed that Ag nanoparticles have decorated the surface of ZnO nanorods successfully. Au nanoparticles with diameter of a few nanometers were distributed over the ZnO surface nanorods. The gas sensing response measurements showed a behavior of n type semiconductor. Furthermore, the Au-functionalized ZnO nanorods gas sensors showed a considerably enhanced response at 250 and 300 °C.

Antiphase Boundaries in Ordered Ni3FE Crystals

1969 ◽  
Vol 27 ◽  
pp. 62-63
Author(s):  
Y. H. Liu
Keyword(s):  
Domain Size ◽  
Antiphase Domain ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hardening Mechanism ◽  
Superlattice Structure ◽  
Disordered Phase ◽  
Domain Boundaries ◽  
Atomic Scattering ◽  
The Difference

Ordered Ni3Fe crystals possess a LI2 type superlattice similar to the Cu3Au structure. The difference in slip behavior of the superlattice as compared with that of a disordered phase has been well established. Cottrell first postulated that the increase in resistance for slip in the superlattice structure is attributed to the presence of antiphase domain boundaries. Following Cottrell's domain hardening mechanism, numerous workers have proposed other refined models also involving the presence of domain boundaries. Using the anomalous X-ray diffraction technique, Davies and Stoloff have shown that the hardness of the Ni3Fe superlattice varies with the domain size. So far, no direct observation of antiphase domain boundaries in Ni3Fe has been reported. Because the atomic scattering factors of the elements in NijFe are so close, the superlattice reflections are not easily detected. Furthermore, the domain configurations in NioFe are thought to be independent of the crystallographic orientations.

scholarly journals Hydrochloric Acid Modification and Lead Removal Studies on Naturally Occurring Zeolites from Nevada, New Mexico, and Arizona

Processes ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 1238
Author(s):  
Garven M. Huntley ◽  
Rudy L. Luck ◽  
Michael E. Mullins ◽  
Nick K. Newberry
Keyword(s):  
New Mexico ◽  
Surface Area ◽  
Bet Surface Area ◽  
Lead Removal ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray ◽  
Naturally Occurring ◽  
27Al Mas Nmr ◽  
Modified Zeolites

Four naturally occurring zeolites were examined to verify their assignments as chabazites AZLB-Ca and AZLB-Na (Bowie, Arizona) and clinoptilolites NM-Ca (Winston, New Mexico) and NV-Na (Ash Meadows, Nevada). Based on powder X-ray diffraction, NM-Ca was discovered to be mostly quartz with some clinoptilolite residues. Treatment with concentrated HCl (12.1 M) acid resulted in AZLB-Ca and AZLB-Na, the chabazite-like species, becoming amorphous, as confirmed by powder X-ray diffraction. In contrast, NM-Ca and NV-Na, which are clinoptilolite-like species, withstood boiling in concentrated HCl acid. This treatment removes calcium, magnesium, sodium, potassium, aluminum, and iron atoms or ions from the framework while leaving the silicon framework intact as confirmed via X-ray fluorescence and diffraction. SEM images on calcined and HCl treated NV-Na were obtained. BET surface area analysis confirmed an increase in surface area for the two zeolites after treatment, NM-Ca 20.0(1) to 111(4) m2/g and NV-Na 19.0(4) to 158(7) m2/g. 29Si and 27Al MAS NMR were performed on the natural and treated NV-Na zeolite, and the data for the natural NV-Na zeolite suggested a Si:Al ratio of 4.33 similar to that determined by X-Ray fluorescence of 4.55. Removal of lead ions from solution decreased from the native NM-Ca, 0.27(14), NV-Na, 1.50(17) meq/g compared to the modified zeolites, 30 min HCl treated NM-Ca 0.06(9) and NV-Na, 0.41(23) meq/g, and also decreased upon K+ ion pretreatment in the HCl modified zeolites.

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