Layer-by-Layer Thin Films of Carbon Nanotubes

2005 ◽  
Vol 901 ◽  
Author(s):  
Marco Palumbo ◽  
Kye Ung Lee ◽  
Byung Tae Ahn ◽  
Anil Suri ◽  
Karl Coleman ◽  
...  
Keyword(s):  
Thin Films ◽  
Carbon Nanotubes ◽  
Self Assembly ◽  
Thin Layers ◽  
Single Wall Carbon Nanotubes ◽  
Layer By Layer ◽  
Force Microscopy ◽  
Atomic Force ◽  
Out Of Plane ◽  
Conductive Thin Films

AbstractLayer-by-layer films incorporating single-wall carbon nanotubes (SWNTs) with anionic or cationic coatings have been prepared. The process of self-assembly was monitored using the quartz microbalance technique, while the morphology of the resulting thin layers was studied with atomic force microscopy. A variety of different architectures have been built up. The dc conductivities of the thin films, in-plane and out-of-plane, were measured at room temperature and contrasted with reference architectures. The results show clearly that the incorporation of SWNTs into the multilayers resulted in electrically conductive thin films.

Layer-by-Layer Thin Films of Alginate/Chitosan and Hyaluronic Acid/Chitosan with Tunable Thickness and Surface Roughness

2014 ◽  
Vol 783-786 ◽  
pp. 1226-1231 ◽  
Author(s):  
Thiago Bezerra Taketa ◽  
Marisa Masumi Beppu
Keyword(s):  
Thin Films ◽  
Hyaluronic Acid ◽  
Self Assembly ◽  
Polymer Chains ◽  
Layer By Layer ◽  
Natural Polymers ◽  
Force Microscopy ◽  
Atomic Force ◽  
Polyelectrolyte Solutions ◽  
Oppositely Charged

Layer-by-layer (LbL) is a bottom-up technique used for construction of films with self-assembly and self-organizing properties. In most cases, the fundamental driving force for the formation of these films is originated from the electrostatic interaction between oppositely charged species. The charged segments of polyelectrolytes behave as small building units and their orientation and position can be designed to target structures of great complexity. Furthermore, the technique enables the use of various materials, including natural polymers. In this work, we chose the cationic biopolymer chitosan (CHI) and the negative polyelectrolytes sodium alginate (ALG) and hyaluronic acid (HA). The aim of this study was to evaluate the effect of ionic strength (0 versus 200 mM) and pH (3 versus 5) on ALG/CHI and HA/CHI nanostructured multilayered thin films properties. From profilometry and atomic force microscopy (AFM) analyses, changes in thickness and roughness of the coatings were monitored. The presence of salt in polyelectrolyte solutions induced the polymer chains to adopt conformations with more loops and tails and this arrangement in solution was transmitted to films, resulting in rougher surfaces. Furthermore, the film thickness can be precisely controlled by adjusting the pH of the polyelectrolyte solution. The variation of these parameters shows that it is possible to molecularly control chemical and structural properties of nanostructured coatings, thus opening up new possibilities of application (e.g. cell adhesion).

High transmittance, photoluminescence properties of PANI: PSS multilayer thin films to develop a hole transport layer for OLED application

10.26524/jap9 ◽  
2016 ◽  
Vol 1 (2) ◽  
Author(s):  
Jayamurugan P ◽  
Manoharan D ◽  
Ramadevi K ◽  
Upendar Reddy K ◽  
Subba Rao Y V
Keyword(s):  
Thin Films ◽  
Self Assembly ◽  
Hole Transport ◽  
Transport Layer ◽  
Hole Transport Layer ◽  
Multilayer Thin Films ◽  
Layer By Layer ◽  
Force Microscopy ◽  
Atomic Force ◽  
Assembly Technique

The nanocolloidal solution has been spin coated on the substrate layer-by-layer, a self-assembly technique has used to form the multilayer thin films. The optical and structural properties of self-assembled multilayer thin films were characterized by UV-visible, photoluminescence, X-ray diffraction and atomic force microscopy

In Situ Atomic Force Microscopy Tip-Induced Deformations and Raman Spectroscopy Characterization of Single-Wall Carbon Nanotubes

Nano Letters ◽  
2012 ◽  
Vol 12 (8) ◽  
pp. 4110-4116 ◽  
Author(s):  
P. T. Araujo ◽  
N. M. Barbosa Neto ◽  
H. Chacham ◽  
S. S. Carara ◽  
J. S. Soares ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectroscopy ◽  
Atomic Force Microscopy ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon ◽  
Force Microscopy ◽  
Atomic Force

Self-assembly layer-by-layer fabrication using porphyrin dye anion and polycation

2009 ◽  
Vol 13 (07) ◽  
pp. 774-778 ◽  
Author(s):  
Byung-Soon Kim ◽  
Young-A Son
Keyword(s):  
Ultrathin Films ◽  
Self Assembly ◽  
Film Surface ◽  
Layer By Layer ◽  
Preparation Technique ◽  
Force Microscopy ◽  
Atomic Force ◽  
Diallyldimethylammonium Chloride ◽  
Afm Analysis ◽  
Progressive Growth

In this study, self-assembled alternating film using poly(diallyldimethylammonium chloride) (PDDAC) and meso-tetrakis(4-carboxyphenyl)porphyrin (MTCP) was prepared as a multilayer deposition on glass substrate. This preparation technique for dye deposition may provide new feasibilities to achieve the manufacture of ultrathin films for nanotechnology application. The deposition films were characterized by UV-vis spectrophotometer and Atomic Force Microscopy (AFM) analysis. The results of UV-vis spectra showed that the absorbance characteristic of the multilayer films linearly increased with an increased number of PDDAC and MTCP bilayers. AFM analysis showed the film surface was relatively uniform and the progressive growth of layers was determined.

Transparent conductive thin films of single-wall carbon nanotubes encapsulating dopant molecules

2012 ◽  
Vol 100 (6) ◽  
pp. 063121 ◽  
Author(s):  
Naoki Kishi ◽  
Ikuma Miwa ◽  
Toshiya Okazaki ◽  
Takeshi Saito ◽  
Toshihisa Mizutani ◽  
...  
Keyword(s):  
Thin Films ◽  
Carbon Nanotubes ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon ◽  
Conductive Thin Films

scholarly journals Fabrication and Characterization of Antibacterial-active Multilayer Films Based on Keggin Polyoxometalates and Methylene Blue

2010 ◽  
Vol 65 (2) ◽  
pp. 140-146 ◽  
Author(s):  
Dan Chen ◽  
Jun Peng ◽  
Haijun Pang ◽  
Pengpeng Zhang ◽  
Yuan Chen ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Self Assembly ◽  
Multilayer Films ◽  
Photoelectron Spectra ◽  
Layer By Layer ◽  
Force Microscopy ◽  
Atomic Force ◽  
Assembly Technique ◽  
Lbl Films ◽  
Cv Measurements

Two kinds of multilayer films based on Keggin polyoxometalates α-[SiW12O40]4−/α- [PMo12O40]3− and methylene blue have been prepared via the layer-by-layer (LBL) self-assembly technique. The multilayer films were characterized by UV/Vis spectra, atomic force microscopy (AFM) and X-ray photoelectron spectra (XPS). The cyclic voltammetry (CV) measurements have demonstrated that the electrochemical properties of POMs are maintained in the LBL films. The antibacterial activity of the LBL films has also been investigated, which shows a distinct antibacterial effect against Escherichia coli.

Two conductive mechanisms in LaMnO3 thin film: Adiabatic and nonadiabatic small polaronic hopping

2021 ◽  
pp. 2150310
Author(s):  
Weiyuan Wang ◽  
Jiyu Fan ◽  
Huan Zheng ◽  
Jing Wang ◽  
Hao Liu ◽  
...  
Keyword(s):  
Thin Films ◽  
Theoretical Models ◽  
Magnetic Phase Transitions ◽  
Epitaxial Thin Films ◽  
X Ray Diffraction ◽  
Epitaxial Relationship ◽  
Reciprocal Space Mapping ◽  
Force Microscopy ◽  
Atomic Force ◽  
Out Of Plane

We have presented the structural, surface morphology, magnetic and resistivity data for perovskite LaMnO3 epitaxial thin films which are fabricated on well-oriented (001) LaAlO3 substrates by pulsed laser deposition technique. X-ray diffraction [Formula: see text]–[Formula: see text] linear scans and reciprocal space mapping measurement confirm that the out-of-plane and in-plane epitaxial relationship are LMO(001)/LAO(001) and LMO(110)/LAO(110), respectively. Surface roughness determined by atomic force microscopy was no more than 0.3 nm. In the whole studied temperature range, all films only show a paramagnetic behavior instead of any magnetic phase transitions. Correspondingly, the electron transport behaviors always exhibit an insulting state as the temperature changes from high to low. However, we find that none of theoretical models can individually be used to understand their conductive mechanisms. Further studies indicated that charge carries of high and low temperature region obey adiabatic and nonadiabatic small polaronic hopping mechanisms, respectively. This finding offers new ways of exploiting the abnormal ferromagnetism in LaMnO3 multilayer thin films.

THICKNESS DEPENDENCE OF THIRD-HARMONIC GENERATION FROM SELF-ASSEMBLED REGIOREGULAR POLY(3-HEXYLTHIOPHENE) THIN FILMS ON QUARTZ GLASSES WITH DIFFERENT SURFACES

2008 ◽  
Vol 17 (04) ◽  
pp. 451-463 ◽  
Author(s):  
XIN WANG ◽  
JIASHENG RU ◽  
SHIZUYASU OCHIAI ◽  
YUU YAMADA ◽  
YOSHIYUKI UCHIDA ◽  
...  
Keyword(s):  
Thin Films ◽  
Visible Absorption ◽  
Force Microscopy ◽  
Glass Substrates ◽  
Atomic Force ◽  
Cast Films ◽  
Regioregular Poly ◽  
Out Of Plane ◽  
Self Assembled ◽  
Quartz Glasses

Regioregular poly(3-hexylthiophene) [RR-P3HT] thin films were prepared on fused quartz glasses by spin-coating and drop-casting from the chloroform solutions. Film structures and morphologies were characterized by UV-visible absorption spectra, out-of-plane X-ray diffraction (XRD) and atomic force microscopy (AFM). Drop-cast films showed increased χ(3) of about three times higher than that of the spin-coated ones when the film thicknesses were both around 140 nm, and the magnitude of the increase was different for different thickness. The magnitudes of χ(3) for drop-cast RR-P3HT films were calculated in the range of 10-11 esu, and the phases of χ(3) lay in the range from 230 to 300° which were consistent with the contributions from two-photon absorptions (TPA). Hexamethyldisilazane (HMDS) treatment of the glass substrates could increase the χ(3) of drop-cast films further from about ten percent to several times higher. This also depended on the film thickness. These results revealed the deposition method and surface modification effects on the self-assembled RR-P3HT film structures, and the importance of higher-ordering and increased crystallinity for the enhancement of the χ(3) of the polymeric films for their applications in NLO devices.

scholarly journals Epitaxial Stabilization of Single-Crystal Multiferroic YCrO3 Thin Films

Nanomaterials ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 2085
Author(s):  
Yogesh Sharma ◽  
Elizabeth Skoropata ◽  
Binod Paudel ◽  
Kyeong Tae Kang ◽  
Dmitry Yarotski ◽  
...  
Keyword(s):  
Thin Films ◽  
Single Crystal ◽  
Magnetic Transition ◽  
Close Correlation ◽  
Layer By Layer ◽  
Epitaxial Thin Films ◽  
X Ray Diffraction ◽  
Magnetic Transition Temperature ◽  
Force Microscopy ◽  
Atomic Force

We report on the growth of stoichiometric, single-crystal YCrO3 epitaxial thin films on (001) SrTiO3 substrates using pulsed laser deposition. X-ray diffraction and atomic force microscopy reveal that the films grew in a layer-by-layer fashion with excellent crystallinity and atomically smooth surfaces. Magnetization measurements demonstrate that the material is ferromagnetic below 144 K. The temperature dependence of dielectric permittivity shows a characteristic relaxor-ferroelectric behavior at TC = 375–408 K. A dielectric anomaly at the magnetic transition temperature indicates a close correlation between magnetic and electric order parameters in these multiferroic YCrO3 films. These findings provide guidance to synthesize rare-earth, chromite-based multifunctional heterostructures and build a foundation for future studies on the understanding of magnetoelectric effects in similar material systems.

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