Synthesis of ZnO Nanowires by Pulsed Laser Deposition in Furnace

2005 ◽  
Vol 900 ◽  
Author(s):  
Kyung Ah Jeon ◽  
Hyo Jeong Son ◽  
Jong Hoon Kim ◽  
K. H. Yoo ◽  
Sang Yeol Lee
Keyword(s):  
Pulsed Laser Deposition ◽  
Deep Level ◽  
Average Length ◽  
Green Light ◽  
Pulsed Laser ◽  
Zno Nanowires ◽  
Laser Deposition ◽  
Near Band Edge ◽  
Vacuum Furnace ◽  
Sem Images

ABSTRACTZnO nanowires (NWs) were fabricated on Au coated sapphire (0001) substrates by using a pulsed laser deposition (PLD) system in vacuum furnace with a Q-switched Nd:YAG laser. ZnO NWs have various size and shape with a substrate position inside a furnace, and their morphologic construction is reproducible. Scanning electron microscopy (SEM) images indicate that the diameters of ZnO NWs ranged from 100 to 150 nm and the average length was greater than 3 μm. Room-temperature photoluminescence spectra of the NWs show the near band-edge emissions and the deep-level green light emissions. The formation mechanism of the NWs is discussed.

Pulsed-laser deposition and characterization of ZnO nanowires with regular lateral arrangement

2007 ◽  
Vol 88 (1) ◽  
pp. 31-34 ◽  
Author(s):  
A. Rahm ◽  
M. Lorenz ◽  
T. Nobis ◽  
G. Zimmermann ◽  
M. Grundmann ◽  
...  
Keyword(s):  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Zno Nanowires ◽  
Laser Deposition

scholarly journals Development of Pd/TiO2 Porous Layers by Pulsed Laser Deposition for Surface Acoustic Wave H2 Gas Sensor

Nanomaterials ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 760 ◽  
Author(s):  
Izabela Constantinoiu ◽  
Cristian Viespe
Keyword(s):  
Acoustic Wave ◽  
Frequency Shift ◽  
Pulsed Laser Deposition ◽  
Surface Acoustic Wave ◽  
Limit Of Detection ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
High Porosity ◽  
Porous Films ◽  
Sem Images

The influence of sensitive porous films obtained by pulsed laser deposition (PLD) on the response of surface acoustic wave (SAW) sensors on hydrogen at room temperature (RT) was studied. Monolayer films of TiO2 and bilayer films of Pd/TiO2 were deposited on the quartz substrates of SAW sensors. By varying the oxygen and argon pressure in the PLD deposition chamber, different morphologies of the sensitive films were obtained, which were analyzed based on scanning electron microscopy (SEM) images. SAW sensors were realized with different porosity degrees, and these were tested at different hydrogen concentrations. It has been confirmed that the high porosity of the film and the bilayer structure leads to a higher frequency shift and allow the possibility to make tests at lower concentrations. Thus, the best sensor, Pd-1500/TiO2-600, with the deposition pressure of 600 mTorr for TiO2 and 1500 mTorr for Pd, had a frequency shift of 1.8 kHz at 2% hydrogen concentration, a sensitivity of 0.10 Hz/ppm and a limit of detection (LOD) of 1210 ppm. SAW sensors based on such porous films allow the detection of hydrogen but also of other gases at RT, and by PLD method such sensitive porous and nanostructured films can be easily developed.

scholarly journals The Properties of Zn-Doped AlSb Thin Films Prepared by Pulsed Laser Deposition

Coatings ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 136
Author(s):  
Ping Tang ◽  
Weimin Wang ◽  
Bing Li ◽  
Lianghuan Feng ◽  
Guanggen Zeng
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Pulsed Laser Deposition ◽  
Band Gap ◽  
Photovoltaic Effect ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Sem Images ◽  
Glass Substrates ◽  
Substrate Temperatures

Aluminum antimony (AlSb) is a promising photovoltaic material with a band gap of about 1.62 eV. However, AlSb is highly deliquescent and not stable, which has brought great difficulties to the applications. Based on the above situation, there are two purposes for preparing our Zn-doped AlSb (AlSb:Zn) thin films: One is to make P-type AlSb and the other is to find a way to suppress the deliquescence of AlSb. The AlSb:Zn thin films were prepared on glass substrates at different substrate temperatures by using the pulsed laser deposition (PLD) method. The structural, surface morphological, optical, and electrical properties of AlSb:Zn films were investigated. The crystallization of AlSb:Zn thin films was enhanced and the electrical resistivity decreased as the substrate temperature increased. The scanning electron microscopy (SEM) images indicated that the grain sizes became bigger as the substrate temperatures increased. The Raman vibration mode AlSb:Zn films were located at ~107 and ~142 cm−1 and the intensity of Raman peaks was stronger at higher substrate temperatures. In the experiment, a reduced band gap (1.4 eV) of the AlSb:Zn thin film was observed compared to the undoped AlSb films, which were more suitable for thin-film solar cells. Zn doping could reduce the deliquescent speed of AlSb thin films. The fabricated heterojunction device showed the good rectification behavior, which indicated the PN junction formation. The obvious photovoltaic effect has been observed in an FTO/ZnS/AlSb:Zn/Au device.

scholarly journals Synthesis of Vertically-Aligned ZnO Nanowires by Nanoparticle- Assisted Pulsed Laser Deposition and Their Application to Photo-Devices

2008 ◽  
Vol 36 (APLS) ◽  
pp. 1230-1233
Author(s):  
Tatsuo OKADA ◽  
Ruqian GUO ◽  
Jun NISHIMURA ◽  
Masato MATSUMOTO ◽  
Mitsuhiro HIGASHIHATA ◽  
...  
Keyword(s):  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Zno Nanowires ◽  
Laser Deposition ◽  
Vertically Aligned

scholarly journals Tailoring the Grain Size of Bi-Layer Graphene by Pulsed Laser Deposition

Nanomaterials ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 885 ◽  
Author(s):  
Jin Wang ◽  
Xuemin Wang ◽  
Jian Yu ◽  
Tingting Xiao ◽  
Liping Peng ◽  
...  
Keyword(s):  
Grain Size ◽  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Photoelectron Spectra ◽  
Laser Deposition ◽  
Stable Region ◽  
Thermoelectric Efficiency ◽  
Sem Images ◽  
Hybrid State ◽  
Layer Graphene

Improving the thermoelectric efficiency of a material requires a suitable ratio between electrical and thermal conductivity. Nanostructured graphene provides a possible route to improving thermoelectric efficiency. Bi-layer graphene was successfully prepared using pulsed laser deposition in this study. The size of graphene grains was controlled by adjusting the number of pulses. Raman spectra indicated that the graphene was bi-layer. Scanning electron microscopy (SEM) images clearly show that graphene changes from nanostructured to continuous films when more pulses are used during fabrication. Those results indicate that the size of the grains can be controlled between 39 and 182 nm. A detailed analysis of X-ray photoelectron spectra reveals that the sp2 hybrid state is the main chemical state in carbon. The mobility is significantly affected by the grain size in graphene, and there exists a relatively stable region between 500 and 800 pulses. The observed phenomena originate from competition between decreasing resistance and increasing carrier concentration. These studies should be valuable for regulating grains sizes for thermoelectric applications of graphene.

Influence of Sb on a controlled-growth of aligned ZnO nanowires in nanoparticle-assisted pulsed-laser deposition

2011 ◽  
Vol 103 (4) ◽  
pp. 959-963 ◽  
Author(s):  
D. Nakamura ◽  
K. Okazaki ◽  
I. A. Palani ◽  
M. Higashihata ◽  
T. Okada
Keyword(s):  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Zno Nanowires ◽  
Laser Deposition ◽  
Controlled Growth
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