Controllable Self-Assembly of 9,10-Diphenylanthracene into Micro-Nanostructures from 0-Dimension to 3-Dimension by Simple Post-Drying Thermal Annealing Method

2014 ◽  
Vol 609-610 ◽  
pp. 266-270
Author(s):  
Jing Wei Sun ◽  
Mi Ouyang ◽  
Cheng Zhang
Keyword(s):  
Thermal Annealing ◽  
Self Assembly ◽  
Annealing Temperature ◽  
Electronic Devices ◽  
Transformation Mechanism ◽  
Surface Deposition ◽  
Supramolecular Architectures ◽  
In Situ Fabrication ◽  
Annealing Method

A post-drying thermal annealing method is proposed to successfully fabricate micro-/nanostructures with 9,10-diphenylanthracene (DPA). Through varying operating temperature, different morphologies from 0-D to 3-D of pure DPA self-assembly were achieved and studied by SEM, XRD and PL spectra. The morphology transformation mechanism was also investigated. These results indicate that varying annealing temperature is an effective way to control the supramolecular architectures of DPA. In addition, such in situ fabrication on a substrate will provide possibility for manufacture of electronic devices which normally require surface deposition of nanomaterials.

In-Situ Study of Ti/TiN Stability under Nitrogen Anneal

1999 ◽  
Vol 564 ◽  
Author(s):  
P. W. DeHaven ◽  
K. P. Rodbell ◽  
L. Gignac
Keyword(s):  
Annealing Temperature ◽  
Time Range ◽  
Second Phase ◽  
Transformation Rate ◽  
Transformation Mechanism ◽  
Second Stage ◽  
Transmission Electron ◽  
Reaction Proceeds ◽  
Two Stages

AbstractThe effectiveness of a TiN capping layer to prevent the conversion of α-titantium to titanium nitride when annealed in a nitrogen ambient has been studied over the temperature range 300–700°C using in-situ high temperature diffraction and transmission electron microscopy. Over the time range of interest (four hours), no evidence of Ti reaction was observed at 300°C. At 450°C. nitrogen was found to diffuse into the Ti to form a Ti(N) solid solution. Above 500°C the titanium is transformed to a second phase: however this reaction follows two different kinetic paths, depending on the annealing temperature. Below 600°C. the reaction proceeds in two stages, with the first stage consisting of Ti(N) formation, and the second stage consisting of the conversion of the Ti(N) with a transformation mechanism characteristic of short range diffusion (grain edge nucleation). Above 600°C, a simple linear transformation rate is observed.

In situ fabrication of multifunctional gold–amino acid superstructures based on self-assembly

2019 ◽  
Vol 55 (27) ◽  
pp. 3967-3970 ◽  
Author(s):  
Xuejiao Yang ◽  
Bohao Yang ◽  
Yuefei Wang ◽  
Wei Qi ◽  
Qiguo Xing ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Amino Acid ◽  
Self Assembly ◽  
Au Nps ◽  
In Situ Fabrication ◽  
Photothermal Effects

Based on self-assembly and biomineralization, Au NPs@ferrocene–tryptophan (Fc-W) superstructures were fabricated, exhibiting efficient photothermal effects and catalytic activity.

Thermodynamics and Phase Constituents of Laser Induced In-Situ-Fabrication of TiB2 Ceramic Coating on Ti-6Al-4V

2013 ◽  
Vol 275-277 ◽  
pp. 2304-2307 ◽  
Author(s):  
Duo Zhang ◽  
Yu Ling Yang ◽  
Yi Ju
Keyword(s):  
Free Energy ◽  
Gibbs Free Energy ◽  
Laser Cladding ◽  
Ceramic Coating ◽  
Transformation Mechanism ◽  
Reaction Equation ◽  
In Situ Fabrication ◽  
Laser Cladding Process ◽  
Energy Theory

In-situ fabrication of TiB ceramic coating by laser cladding technology (LC) was investigated. Pulsed YAG laser with the power of 500 W was used. The mixture of Titanium powder (with the size of 20 m) and B powder (with the size of 140 m) were utilized as the precursor. The reactive transformation mechanism and phase constituents of the in-situ fabricating coating during the laser cladding process were studied by thermodynamics analysis, as well as XRD methods. Gibbs free energy theory was used to calculate the increment of Gibbs free energy at different temperature. The results show that the increment of the Gibbs free energy for the reaction equation to the in-situ fabricate TiB2 keep to be negative within the temperature of 3000K, this indicate that TiB2 can be obtained by laser cladding the mixture powder of Ti and B. XRD results show that the main phases of the coating are TiB2, TiO2 and B2O3 with relative percentage of 67.6%, 18.0% and 14.4%, respectively.

Doped ZnO Nanowires Obtained by Thermal Annealing

2007 ◽  
Vol 7 (2) ◽  
pp. 700-703 ◽  
Author(s):  
C. X. Shan ◽  
Z. Liu ◽  
C. C. Wong ◽  
S. K. Hark
Keyword(s):  
Thermal Annealing ◽  
Doping Concentration ◽  
Annealing Temperature ◽  
Zno Nanowires ◽  
X Ray Diffraction ◽  
X Ray ◽  
Doped Zno ◽  
Znse Nanowires ◽  
Annealing Method ◽  
Scanning Electron

Doped ZnO nanowires were prepared in a very simple and inexpensive thermal annealing method using ZnSe nanowires as a precursor. As doped, P doped, and As/P codoped ZnO nanowires were obtained in this method. X-ray diffraction shows that the zincblende ZnSe nanowires were converted to doped wurtzite ZnO nanowires. The incorporation of the dopants was confirmed by energy dispersive X-ray spectroscopy. The doping concentration could be adjusted by changing the annealing temperature and duration. Scanning electron microscopy indicated that the morphology of the ZnSe nanowires was essentially retained after the annealing and doping process. Photoluminescence spectroscopy also verified the incorporation of the dopants into the nanowires.

scholarly journals Supramolecular architectures of molecularly thin yet robust free-standing layers

2019 ◽  
Vol 5 (2) ◽  
pp. eaav4489 ◽  
Author(s):  
Mina Moradi ◽  
Nadia L. Opara ◽  
Ludovico G. Tulli ◽  
Christian Wäckerlin ◽  
Scott J. Dalgarno ◽  
...  
Keyword(s):  
Self Assembly ◽  
Electronic Devices ◽  
Nanometer Scale ◽  
Electron Radiation ◽  
Free Standing ◽  
Supramolecular Architectures ◽  
Wide Range ◽  
Noncovalent Bonds ◽  
Monomolecular Layers ◽  
Molecular Layers

Stable, single-nanometer thin, and free-standing two-dimensional layers with controlled molecular architectures are desired for several applications ranging from (opto-)electronic devices to nanoparticle and single-biomolecule characterization. It is, however, challenging to construct these stable single molecular layers via self-assembly, as the cohesion of those systems is ensured only by in-plane bonds. We herein demonstrate that relatively weak noncovalent bonds of limited directionality such as dipole-dipole (–CN⋅⋅⋅NC–) interactions act in a synergistic fashion to stabilize crystalline monomolecular layers of tetrafunctional calixarenes. The monolayers produced, demonstrated to be free-standing, display a well-defined atomic structure on the single-nanometer scale and are robust under a wide range of conditions including photon and electron radiation. This work opens up new avenues for the fabrication of robust, single-component, and free-standing layers via bottom-up self-assembly.

Doped ZnO Nanowires Obtained by Thermal Annealing

2007 ◽  
Vol 7 (2) ◽  
pp. 700-703
Author(s):  
C. X. Shan ◽  
Z. Liu ◽  
C. C. Wong ◽  
S. K. Hark
Keyword(s):  
Thermal Annealing ◽  
Doping Concentration ◽  
Annealing Temperature ◽  
Zno Nanowires ◽  
X Ray Diffraction ◽  
X Ray ◽  
Doped Zno ◽  
Znse Nanowires ◽  
Annealing Method ◽  
Scanning Electron

Doped ZnO nanowires were prepared in a very simple and inexpensive thermal annealing method using ZnSe nanowires as a precursor. As doped, P doped, and As/P codoped ZnO nanowires were obtained in this method. X-ray diffraction shows that the zincblende ZnSe nanowires were converted to doped wurtzite ZnO nanowires. The incorporation of the dopants was confirmed by energy dispersive X-ray spectroscopy. The doping concentration could be adjusted by changing the annealing temperature and duration. Scanning electron microscopy indicated that the morphology of the ZnSe nanowires was essentially retained after the annealing and doping process. Photoluminescence spectroscopy also verified the incorporation of the dopants into the nanowires.

Structural Analysis of Silicon Nanostructures Obtained from Thermal Annealing of a-Si:H/SiO2 Superlattices

2014 ◽  
Vol 605 ◽  
pp. 295-298 ◽  
Author(s):  
Solomon Agbo ◽  
Pavel Calta ◽  
P. Šutta ◽  
V. Vavruňková ◽  
M. Netrvalová ◽  
...  
Keyword(s):  
Thermal Annealing ◽  
Vapour Deposition ◽  
Annealing Temperature ◽  
Silicon Oxide ◽  
Chemical Vapour ◽  
Silicon Nanostructures ◽  
X Ray ◽  
Hydrogenated Amorphous

This paper reports the synthesis and characterization of silicon quantum dots (QDs) obtained by thermal annealing of hydrogenated amorphous silicon (a-Si:H)/silicon oxide (SiO2) supperlattices deposited by plasma-enhanced chemical vapour deposition (PE-CVD). The as-deposited supperlattices have been annealed in high-temperature vacuum chamber, at temperatures up to 1100 °C, where in-situ phase transformation was monitored by x-ray diffractometry, XRD. It is shown that onset of crystallization and phase separation occur at different annealing temperature depending on the a-Si:H sub-layer thickness. Complete crystallization of the films and precipitation of the QDs occur at 1000 °C.

scholarly journals The Insulator to Superconductor Transition in Ga-Doped Semiconductor Ge Single Crystal Induced by the Annealing Temperature

2015 ◽  
Vol 2015 ◽  
pp. 1-4 ◽  
Author(s):  
Y. B. Sun ◽  
Z. F. Di ◽  
T. Hu ◽  
X. M. Xie
Keyword(s):  
Single Crystal ◽  
Thermal Annealing ◽  
Rapid Thermal Annealing ◽  
Annealing Temperature ◽  
Transport Measurements ◽  
Annealing Method

We have fabricated the heavily Ga-doped layer in Ge single crystal by the implantation and rapid thermal annealing method. The samples show a crossover from the insulating to the superconducting behavior as the annealing temperature increases. Transport measurements suggest that the superconductivity is from the heavily Ga-doped layer in Ge.

Formation of supramolecular nanostructures via in situ self-assembly and post-assembly modification of a biocatalytically constructed dipeptide hydrazide

2021 ◽  
Author(s):  
Yuki Shintani ◽  
Taku Ohtomi ◽  
Aya Shibata ◽  
Yoshiaki Kitamura ◽  
Koichiro M. Hirosawa ◽  
...  
Keyword(s):  
Self Assembly ◽  
Bond Formation ◽  
Hydrazone Bond ◽  
Supramolecular Architectures ◽  
Aqueous Conditions

The in situ self-assembly of a biocatalytically constructed dipeptide hydrazide gives rise to supramolecular hydrogels, consisting of networks of supramolecular nanoarchitectures, under mild aqueous conditions. Moreover, the post-assembly modification via hydrazone bond formation enables the decoration of the prefabricated supramolecular architectures.

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