Patterned Fabrication of Single ZnO Nanorods and Measurement of Their Optoelectrical Characteristics

2008 ◽  
Vol 8 (9) ◽  
pp. 4377-4381
Author(s):  
Chun-Wei Yu ◽  
Shang-Hung Lai ◽  
Teng-Yi Wang ◽  
Ming-Der Lan ◽  
Mon-Shu Ho
Keyword(s):  
Emission Spectroscopy ◽  
Large Scale ◽  
Zno Nanorods ◽  
Si Substrate ◽  
Field Emission Display ◽  
Conductive Afm ◽  
Uv Emission ◽  
New Process ◽  
Pl Emission ◽  
Hexagonal Nanorods

This work develops a new process of growing well ordered ZnO nanorods in large scale on the Si(111) substrate. Nanosphere lithography (NSL) was adopted to produce a matrix in an extensive area. A pattern with a controlled amount of gold was formed through the nanosphere mask. The ZnO nanorods were then grown on a patterned Au/Si substrate through a metal catalytic vapor-liquid-solid (VLS) process. The structure and characteristics of ZnO nanorods were investigated by XRD, SEM and TEM. The hexagonal nanorods were dominated at (0002) direction with a lattice constant of ∼5.03 Å. The optoelectronical properties were studied by PL emission spectroscopy. A strong UV emission at 380 nm was observed. The band gap of the single ZnO nanorod was directly measured to be 3.36 eV using a conductive AFM. The superiority of patterned ZnO nanorods indicates their great potential in field emission display arrays.

scholarly journals ZnO Nanorod/Graphene Hybrid-Structures Formed on Cu Sheet by Self-Catalyzed Vapor-Phase Transport Synthesis

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 450
Author(s):  
Hak Dong Cho ◽  
Deuk Young Kim ◽  
Jong-Kwon Lee
Keyword(s):  
Vapor Phase ◽  
Zno Nanorods ◽  
Light Illumination ◽  
Neutral Donor ◽  
Vapor Phase Transport ◽  
Uv Emission ◽  
Current Voltage ◽  
Device Applications ◽  
Graphene Glass ◽  
Phase Transport

High crystalline ZnO nanorods (NRs) on Zn pre-deposited graphene/Cu sheet without graphene transfer process have been fabricated by self-catalyzed vapor-phase transport synthesis. Here, the pre-deposited Zn metal on graphene not only serves as a seed to grow the ZnO NRs, but also passivates the graphene underneath. The temperature-dependent photoluminescence spectra of the fabricated ZnO NRs reveal a dominant peak of 3.88 eV at 10 K associated with the neutral-donor bound exciton, while the redshifted peak by bandgap shrinkage with temperature and electron-lattice interactions leads a strong emission at 382 nm at room temperature. The optical absorption of the ZnO NRs/graphene hetero-nanostructure at this ultraviolet (UV) emission is then theoretically analyzed to quantify the absorption amount depending on the ZnO NR distribution. By simply covering the ZnO NR/graphene/Cu structure with the graphene/glass as a top electrode, it is observed that the current-voltage characteristic of the ZnO NR/graphene hetero-nanojunction device exhibits a photocurrent of 1.03 mA at 3 V under a light illumination of 100 μW/cm2. In particular, the suggested graphene/ZnO NRs/graphene hybrid-nanostructure-based devices reveal comparable photocurrents at a bidirectional bias, which can be a promising platform to integrate 1D and 2D nanomaterials without complex patterning process for UV device applications.

Room Temperature Solvent-Free Synthesis of Monodisperse Magnetite Nanocrystals

2006 ◽  
Vol 6 (3) ◽  
pp. 852-856 ◽  
Author(s):  
X. R. Ye ◽  
C. Daraio ◽  
C. Wang ◽  
J. B. Talbot ◽  
S. Jin
Keyword(s):  
Oleic Acid ◽  
Solid State ◽  
Large Scale ◽  
Room Temperature ◽  
Solvent Free ◽  
Two Dimensional ◽  
New Process ◽  
High Boiling Point ◽  
Magnetite Nanocrystals ◽  
Solvent Free Synthesis

We have successfully demonstrated a facile, solvent-free synthesis of highly crystalline and monodisperse Fe3O4 nanocrystallites at ambient temperature avoiding any heating. Solid state reaction of inorganic Fe(II) and Fe(III) salts with NaOH was found to produce highly crystalline Fe3O4 nanoparticles. The reaction, if carried out in the presence of surfactant such as oleic acid–oleylamine adduct, generated monodisperse Fe3O4 nanocrystals extractable directly from the reaction mixture. The extracted nanoparticles were capable of forming self-assembled, two-dimensional and uniform periodic array. The new process utilizes inexpensive and nontoxic starting materials, and does not require a use of high boiling point and toxic solvents, thus is amenable to an environmentally desirable, large-scale synthesis of nanocrystals.

scholarly journals Star formation thresholds derived From THINGS

2006 ◽  
Vol 2 (S237) ◽  
pp. 397-397
Author(s):  
F. Bigiel ◽  
F. Walter ◽  
E. de Blok ◽  
E. Brinks ◽  
B. Madore
Keyword(s):  
Star Formation ◽  
Large Scale ◽  
Gravitational Instability ◽  
Critical Density ◽  
Nearby Galaxy ◽  
Uv Emission ◽  
Radial Profiles ◽  
Wide Range ◽  
First Results ◽  
Type Mass

AbstractWe present first results from THINGS (The HI Nearby Galaxy Survey), which consists of high quality HI maps obtained with the VLA of 34 galaxies across a wide range of galaxy parameters (Hubble type, mass/luminosity). We compare the distribution of HI to the UV emission in our sample galaxies. In particular we present radial profiles of the HI (tracing the neutral interstellar medium) and UV (mainly tracing regions of recent star formation) in our sample galaxies. The azimuthally averaged HI profiles are compared to the predicted critical density above which organized large-scale star formation is believed to start (this threshold is based on the Toomre-Q parameter, which in turn is a measure for local gravitational instability).

Synthesis of ordered ZnO nanorods film on zinc-coated Si substrate and their photoluminescence property

2006 ◽  
Vol 99 (1) ◽  
pp. 50-53 ◽  
Author(s):  
Aiwu Zhao ◽  
Tao Luo ◽  
Luyang Chen ◽  
Yong Liu ◽  
Xiaoguang Li ◽  
...  
Keyword(s):  
Zno Nanorods ◽  
Photoluminescence Property ◽  
Si Substrate

(Invited) High Brightness, Large Scale GaN Based Light-Emitting Diode Grown on 8-Inch Si Substrate

2014 ◽  
Vol 61 (4) ◽  
pp. 71-78
Author(s):  
S.-J. Lee ◽  
H.-J. Park ◽  
J.-B. Park ◽  
D.-W. Jeon ◽  
J. H. Baek ◽  
...  
Keyword(s):  
Large Scale ◽  
Light Emitting Diode ◽  
Si Substrate ◽  
High Brightness ◽  
Light Emitting

scholarly journals ZnO Nanoparticles on Si, Si/Au, and Si/Au/ZnO Substrates by Mist-Atomisation

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Z. Khusaimi ◽  
M. H. Mamat ◽  
N. Abdullah ◽  
M. Rusop
Keyword(s):  
Zno Nanoparticles ◽  
Substrate Surface ◽  
Zno Nanorods ◽  
Zinc Nitrate ◽  
Growth Patterns ◽  
Visible Range ◽  
Si Substrates ◽  
Chemical Equations ◽  
Support Size ◽  
Pl Emission

ZnO nanoparticles were prepared on Si substrates by a mist-atomisation technique. Precursor of aqueous solution zinc nitrate and HMTA were released on substrates heated at 200, 300, and400°Cconfined in chamber box. The surface of Si substrate was varied, that is, gold-seeded Si (Si/Au), ZnO nanorods on Si/Au (Si/Au/ZnO), and just Si. The samples were subsequently analysed by X-ray diffraction, scanning electron microscopy, and photoluminescence (PL) spectroscopy to study their structural, surface morphology, and PL emission properties. Analysis from the XRD patterns of the films showed stronga-andc-axis lattice and of pure ZnO hexagonal wurtzite type. The crystallite size varied from 6 to 43 nm and was found to generally increase with increasing substrates' temperatures (Ts). SEM micrographs revealed granular-like structure throughout. Shifts pattern of PL emission at ultraviolet and visible range was found to support size changes observed. Both substrate surface type and deposition temperature were found to significantly affect crystalline growth of ZnO nanoparticles. Chemical equations and justification for growth patterns are also suggested.

Zero bias UV detection and precursor effect on properties of ZnO nanorods grown by hydrothermal method on SiO2/p-Si substrate

2019 ◽  
Vol 685 ◽  
pp. 343-352 ◽  
Author(s):  
Aniruddh Bahadur Yadav ◽  
P.V.L. Parvathi ◽  
Ruba Thabassum Shaik
Keyword(s):  
Hydrothermal Method ◽  
Zno Nanorods ◽  
Uv Detection ◽  
Si Substrate ◽  
Zero Bias
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