Growth of Vertically Aligned ZnO Nanowires on Iron Oxide Layer

2011 ◽  
Vol 378-379 ◽  
pp. 740-743
Author(s):  
Swee Yong Pung ◽  
Kwang Leong Choy
Keyword(s):  
Iron Oxide ◽  
Low Cost ◽  
Chemical Vapor ◽  
Good Alternative ◽  
Zno Nanowires ◽  
Synthesis Process ◽  
Iron Film ◽  
Si Substrates ◽  
Vertically Aligned ◽  
Iron Oxide Films

A low cost and substrate-independent method has been established to synthesize vertically aligned ZnO nanowires (NWs) on iron oxide films coated silicon substrates via low pressure Chemical Vapor Deposition (CVD) method at 650oC. In this study, Si substrates were dipped into the iron (III) nitrate nonahydrate solution prior to the synthesis process. This oxidized iron film facilitated the growth of highly oriented (002) ZnO seed layer, which allowed subsequent vertically aligned ZnO NWs to be grown on top of it during the synthesis. This approach has provided a good alternative to grow vertically aligned ZnO NWs without the need of considering the epilayer relationship between the ZnO and the material to be used as substrate.

Low-Cost Sputtering Process for Carbon Nanotubes Synthesis

2019 ◽  
Vol 891 ◽  
pp. 195-199
Author(s):  
Theerapol Thurakitseree ◽  
Chupong Pakpum
Keyword(s):  
Carbon Nanotubes ◽  
Low Cost ◽  
Chemical Vapor ◽  
Thin Film Deposition ◽  
Deposition Process ◽  
Film Deposition ◽  
Synthesis Process ◽  
Metal Thin Films ◽  
Si Substrates ◽  
Custom Made

According to their wonderful properties, carbon nanotubes (CNTs) have been well known for decades. The synthesis process and catalyst deposition method have also drawn attention to control the nanotube structure and properties. Sputtering method is then one promising option to grow the nanotubes in mass production. This method is, however, still costly. Here, we have presented a simple low-cost custom-made DC magnetron sputtering for catalyst thin film deposition. Three different metal thin films (Fe, Ni, Cu) deposited on Si substrates have been employed to investigate nanotube production. Prior to deposition of the catalysts, Al was used as supporting layer. (Al/Fe, Al/Ni, Al/Cu). CNTs were grown by chemical vapor deposition process at 800°C. Ethanol was preliminary used as a carbon source. It was found that CNTs could be successfully grown from only Al/Ni catalysts in our system with the diameter of approximately 200 nm, where the rest of samples were not observed. In addition, vertical-aligned CNTs with the thickness of about 10 μm could be obtained when acetylene was replaced instead of ethanol with reducing partial pressure of the feedstock. A large D-band at 1338 cm-1 with broader G-band at 1582 cm-1 from Raman spectra give a rise to multi layers growth of sp2 carbon walls. Such dimension suggests that it is the characteristic of multi-walled carbon nanotubes.

Synthesis of Nano Structured Membrane from Carbon Nanotube for Waste Water Treatment

2013 ◽  
Vol 829 ◽  
pp. 386-390 ◽  
Author(s):  
Mehri Imani ◽  
Alimorad Rashidi ◽  
Mojtaba Shariaty-Niassar ◽  
Elahe Sarlak ◽  
Amir Zarghan
Keyword(s):  
Waste Water ◽  
Carbon Nanotube ◽  
Metal Ion ◽  
Low Cost ◽  
Waste Water Treatment ◽  
Chemical Vapor ◽  
Morphological Properties ◽  
Carbon Membranes ◽  
Vertically Aligned ◽  
Simple Technology

Carbon membranes have high adsorption capacitiy with respect to its incredible properties such as unique structural, electronic, optoelectronic, semiconductor, mechanical, chemical and physical. Carbon nanotube (CNT) membranes because of its high permeance have been recently developed.Great attention has been currently paid to the field of fabrication methods capable of producing uniform, well-aligned and monodispersed CNT array. Current research concerns with fabrication of vertically aligned CNT membrane in order to remove heavy metal ion presents in waste water. For this purpose, CNTs are vertically grown up through the holes of anodic aluminium oxide (AAO); as a template, by chemical vapor deposition (CVD) of acetylene gas.In this work a few heavy metals such as Pb (II), Cu (II) and Cd (II) has been examined for checking the perfomance of membrane in aqueous solution. The morphological properties of the aligned CNT membrane were investigated with scanning electron microscopy (SEM). The method has simple technology, low cost, and easy reproduction.

scholarly journals MECHANICAL RESPONSE TO DEEP-CRYOGENIC TREATMENT OF ZnO NANOWIRES GROWN ON BULK ZnO COATING

2016 ◽  
Vol 19 (2) ◽  
Author(s):  
MARCELLO CABIBBO ◽  
DANIELE CICCARELLI
Keyword(s):  
Mechanical Response ◽  
Cryogenic Treatment ◽  
Chemical Vapor ◽  
Zno Nanowires ◽  
Organic Chemical ◽  
Deep Cryogenic Treatment ◽  
Buckling Stress ◽  
Metal Organic ◽  
Vertically Aligned ◽  
Application Fields

ZnO nanowires are currently used in many application fields. Thermal stability is often a concern in terms of the mechanical response and, in particular, for the elasticity of the nanowires. Literature works focused, to a certain degree, on the nanowires heating response. Anyhow, no experimental data are nowadays available in literature on the low- and very low-temperature exposures. In the present study, deep-cryogenic treatment was performed on vertically aligned ZnO nanowires produced by metal organic chemical vapor deposition. The critical buckling stress and strain of individual nanowires was not significantly influenced by the cryogenic exposure, while the bulk ZnO halved.

The large response current of a vacuum pressure sensor based on a vertically-aligned ZnO nanowires array

RSC Advances ◽  
2016 ◽  
Vol 6 (115) ◽  
pp. 114566-114571 ◽  
Author(s):  
Ding Wang ◽  
Xuejun Zheng ◽  
Xinchao Cao ◽  
Xianying Wang ◽  
Tong Zhang
Keyword(s):  
Pressure Sensor ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Zno Nanowires ◽  
Vacuum Pressure ◽  
Vertically Aligned ◽  
Sensitive Characteristics ◽  
Response Current ◽  
Nanowires Array ◽  
Large Response

A vertically-aligned ZnO nanowires (VA-ZnO-NWs) array was prepared via chemical vapor deposition, which was used to fabricate a vacuum pressure sensor and its sensitive characteristics were measured using a semiconductor parameter tester.

Towards high-performance, low-cost quartz sensors with high-density, well-separated, vertically aligned ZnO nanowires by low-temperature, seed-less, single-step, double-sided growth

2013 ◽  
Vol 24 (35) ◽  
pp. 355503 ◽  
Author(s):  
Andrea Orsini ◽  
Pier Gianni Medaglia ◽  
David Scarpellini ◽  
Roberto Pizzoferrato ◽  
Christian Falconi
Keyword(s):  
Low Temperature ◽  
High Performance ◽  
Low Cost ◽  
Single Step ◽  
Zno Nanowires ◽  
High Density ◽  
Vertically Aligned

Vertically Aligned Carbon Nanotubes from Palm Oil Precursor

2013 ◽  
Vol 667 ◽  
pp. 542-548 ◽  
Author(s):  
A.B. Suriani ◽  
A.A. Azira ◽  
S.F. Nik ◽  
M.H. Taib ◽  
F. Mohamed ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Palm Oil ◽  
Ambient Pressure ◽  
Complex Structure ◽  
Chemical Vapor ◽  
Synthesis Process ◽  
Annealing Duration ◽  
Vertically Aligned Carbon Nanotubes ◽  
Aligned Carbon Nanotubes ◽  
Vertically Aligned

This paper reports a study on vertically aligned carbon nanotubes (VACNTs) synthesized by thermal chemical vapor deposition (TCVD) method using eco-friendly carbon source; palm oil. Palm oil vaporized at 450oC in argon atmosphere at ambient pressure. For better decomposition of palm oil complex structure, ferrocene were added into palm oil and stirred for 20 minutes prior to synthesis process. The synthesis and annealing duration took 30 and 10 minutes respectively. The field emission scanning electron microscopy (FESEM) and infrared spectroscopy analysis were systematically studied on CNTs produced. The detailed of CNTs properties will be discussed further.

Patterned Growth of Long and Clean Boron Nitride Nanotubes on Substrates

2009 ◽  
Vol 1204 ◽  
Author(s):  
Chee Huei Lee ◽  
Ming Xie ◽  
Jiesheng Wang ◽  
Russell E. Cook ◽  
Yoke Khin Yap
Keyword(s):  
Boron Nitride ◽  
Chemical Vapor ◽  
Boron Nitride Nanotubes ◽  
Device Fabrication ◽  
Critical Parameters ◽  
Synthesis Process ◽  
High Quality ◽  
Patterned Growth ◽  
Si Substrates ◽  
First Time

AbstractFor the first time, patterned growth of boron nitride nanotubes (BNNTs) on Si substrates has been achieved by catalytic chemical vapor deposition (CCVD). Following the boron oxide chemical pathway and our growth vapor trapping approach, high quality and quantity BNNTs can be produced. Effective catalysts have been found to facilitate the growth of BNNTs, while some critical parameters of the synthesis have also been identified to control the quality and density. The success of patterned growth of high quality BNNTs not only explains the roles of the effective catalysts during the synthesis process, but could also be of technologically important for future device fabrication.

Formation and characterization of crystalline iron oxide films on self-assembled organic monolayers and their in situ patterning

2001 ◽  
Vol 16 (2) ◽  
pp. 564-569 ◽  
Author(s):  
Hyunjung Shin ◽  
Jong Up Jeon ◽  
Y. Eugene Pak ◽  
Hyejin Im ◽  
Eung Soo Kim
Keyword(s):  
Iron Oxide ◽  
Microcontact Printing ◽  
Oxide Films ◽  
Thin Layers ◽  
Organic Monolayers ◽  
Selective Deposition ◽  
Si Substrates ◽  
Self Assembled ◽  
Iron Oxide Films

Crystalline and pore-free films of α–Fe2O3 were prepared on hydrophilic self-assembled organic monolayers (DTT-SAMs) at 80 °C. Subsequently, Fe3O4 and γ–Fe2O3 films were synthesized via post annealing of as-deposited α–Fe2O3. In situ patterning of crystalline iron oxide thin layers was achieved via microcontact printing (μCP) and selective deposition. μCP was used to pattern two different surface moieties of self-assembled organic monolayers (SAMs) on Au–Cr–Si substrates. An elastomeric stamp was used to transfer either hexadecanethiol (HDT) SAMs, which are to sustain deposition of iron oxide precipitates, or hydrophilic SAMs [e.g., dithiothreitol (DTT)]. Selective deposition was realized through precipitation of iron oxide phases. Iron oxide films were deposited onto hydrophilic SAMs, but not onto HDT surfaces. Line (width of <1 μm) patterns in crystalline α–Fe2O3 thin films were obtained.

Study of the Electrical Characteristics of the CNT/SiC Interface

2009 ◽  
Vol 615-617 ◽  
pp. 231-234
Author(s):  
Micaela Castellino ◽  
Stefano Bianco ◽  
Denis Perrone ◽  
Simone Musso ◽  
Mauro Giorcelli ◽  
...  
Keyword(s):  
Vapor Deposition ◽  
Preliminary Analysis ◽  
Multiwall Carbon Nanotubes ◽  
Chemical Vapor ◽  
Electrical Characteristics ◽  
Thermal Chemical Vapor Deposition ◽  
Si Substrates ◽  
Structure And Morphology ◽  
Vertically Aligned ◽  
Multiwall Carbon

Vertically aligned multiwall carbon nanotubes were directly grown by means of thermal Chemical Vapor Deposition onto epitaxial and bulk double side polished 4H-SiC substrates. Their structure and morphology have been examined through Field Emission Scanning Electron Microscopy and Raman spectroscopy. The results have been compared with CNTs carpets grown in the same conditions on Si substrates. Preliminary analysis of their electrical properties has been performed using the four-point probe technique in order to evaluate their resistivity.

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