Supramolecular self-assembly of three-dimensional polyaniline and polypyrrole crystals

2014 ◽  
Vol 50 (84) ◽  
pp. 12757-12760 ◽  
Author(s):  
Yulun Tao ◽  
Juchuan Li ◽  
Anjian Xie ◽  
Shikuo Li ◽  
Ping Chen ◽  
...  
Keyword(s):  
Self Assembly ◽  
Room Temperature ◽  
Conductive Polymer ◽  
Three Dimensional ◽  
Polymer Crystals ◽  
Solvent Environment

Supramolecular self-assembly of 3D conductive polymer crystals in a suitable solvent environment at room temperature.

Self-assembly of a Novel Three-dimensional Silver(I) Supramolecular Framework from Cationic Chains and Anionic Sheets

2010 ◽  
Vol 65 (2) ◽  
pp. 152-156
Author(s):  
Di Sun ◽  
Cheng-Feng Yang ◽  
Zhan-Hua Wei ◽  
Geng-Geng Luo ◽  
Na Zhang ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Hydrogen Bonds ◽  
Self Assembly ◽  
Room Temperature ◽  
Three Dimensional ◽  
Supramolecular Framework ◽  
Π Interactions ◽  
Π Stacking ◽  
Benzenedicarboxylic Acid

A new three-dimensional (3D) supramolecular framework, [Ag2(bipy)2(bdc)·4H2O]n 1, has been synthesized by the ultrasonic reaction of Ag2O, bipy and H2bdc (H2bdc = 1,4-benzenedicarboxylic acid; bipy = 4,4’-bipyridine) at room temperature. It exhibits a new 3D supramolecular framework which is built from cationic Ag-bipy chains and anionic bdc-H2O sheets through hydrogen bonds, π · · ·π stacking and C-H· · ·π interactions. Additionally, the photoluminescent and thermal properties of 1 were investigated.

3D Photonic Structures by Sol-Gel Imprint Lithography

2007 ◽  
Vol 1002 ◽  
Author(s):  
Marc Verschuuren ◽  
Hans Van Sprang
Keyword(s):  
Self Assembly ◽  
Room Temperature ◽  
Sol Gel ◽  
Three Dimensional ◽  
Imprint Lithography ◽  
Replication Process ◽  
Simple Process ◽  
Excellent Quality ◽  
Photonic Structures ◽  
Silica Material

ABSTRACTWe present a new and relatively simple process to manufacture three-dimensional sub-micron structures over square centimeter areas using a soft stamp imprinting process. The room-temperature replication process shows excellent quality in transferring features directly into inorganic silica material with pattern distortion smaller than 0.03% over an area of 15×15mm2. Using a self assembly planarization method the imprinting process can be repeated to form three-dimensional structures. As a demonstration, a multilayer stack of four crossed gratings is shown.

Scanning Tunneling Microscopy Study of α,ω-Dihexylsexithiophene Adlayers on Au(111): A Chiral Separation Induced by a Surface

2012 ◽  
Vol 18 (4) ◽  
pp. 885-891 ◽  
Author(s):  
Yonghai Song ◽  
Yu Wang ◽  
Lingli Wan ◽  
Shuhong Ye ◽  
Haoqing Hou ◽  
...  
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Self Assembly ◽  
Room Temperature ◽  
Three Dimensional ◽  
Microscopy Study ◽  
Molecular Structures ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Left Handed ◽  
Bulk Structure

AbstractThe self-assembly of α,ω-dihexylsexithiophene molecules on an Au(111) surface was examined by using scanning tunneling microscopy at room temperature, revealing the internal molecular structures of the sexithiophene backbones and the hexyl side chains. The α,ω-dihexylsexithiophene formed a large and well-ordered monolayer in which the molecule lay flatly on the Au(111) surface and was separated into two chiral domains. A detailed observation reveals that the admolecules were packed in one lamellae with their molecular axis aligned along the main axis of the Au(111) substrate with their hexyl chains deviated from ⟨110⟩ direction of the Au(111) substrate by 12 ± 0.5°. In contrast to the behavior in the three-dimensional bulk structure, flat-lying adsorption introduced molecular chirality: right- and left-handed molecules separate into domains of two different orientations, which are mirror symmetric with respect to the ⟨121⟩ direction of the Au(111) substrate. Details of the adlayer structure and the chiral self-assembly were discussed here.

Template-Free Synthesis and Properties of Polyaniline Nanostructures Doped with Different Oxidants

2011 ◽  
Vol 688 ◽  
pp. 334-338 ◽  
Author(s):  
He Yang ◽  
Yun Ze Long ◽  
Hang Jun Ding
Keyword(s):  
Self Assembly ◽  
Room Temperature ◽  
Three Dimensional ◽  
Ammonium Persulfate ◽  
Molar Ratio ◽  
Temperature Conductivity ◽  
Room Temperature Conductivity ◽  
Assembly Method ◽  
Temperature Dependence Of Conductivity ◽  
Template Free

In this work, we report on conducting polyaniline (PANI) nanostructures synthesized by a simplified template-free self-assembly method, which are doped with different oxidants such as ammonium persulfate (APS), FeCl3, Fe(NO3)3, and Fe2(SO4)3. It is found that the morphologies of the as-prepared PANI nanowires are dependent on the oxidant and the molar ratio of aniline to oxidant. The PANI nanostructures are semiconducting with room-temperature conductivity ranging from 10-2to 100S/cm, and the temperature dependence of conductivity follows three-dimensional Mott variable range hopping (3D Mott-VRH) model. In addition, the PANI pellets exhibit hydrophilic behavior.

Direct observation of monomer image of poly(p-xylylene) crystal

1992 ◽  
Vol 50 (1) ◽  
pp. 380-381
Author(s):  
Weiping Zhang ◽  
Edwin L. Thomas
Keyword(s):  
Electron Irradiation ◽  
Room Temperature ◽  
Three Dimensional ◽  
High Resolution Electron Microscopy ◽  
Chain Scission ◽  
Polymer Crystals ◽  
Resolution Electron ◽  
Chain Axis ◽  
Dimensional Reconstruction ◽  
Short Time

Poly(p-xylylene) (PPX) single crystals have been studied recently with high-resolution electron microscopy (HREM) by two groups. The resolution achieved to date is 0.26 nm for the α-form and 0.25 nm for the β-form. Polymer crystals are generally very sensitive to electron irradiation since the molecular chains become crosslinked or are decomposed (chain scission) in a short time upon electron irradiation. Individual chain stems in a polymer crystal can be resolved in micrographs if the electron beam is introduced into die crystal along the chain axis. Obtaining structural images from different crystal orientations is very useful in three dimensional reconstruction. Most HREM studies on polymer crystals have focused on taking images along the polymer chain direction. The present work demonstrates that monomer images can be obtained from other directions, and a 0.18 nm resolution is achieved for α-form PPX crystals at room temperature.

Self-Assembly of a Three-Dimensional Supramolecular Structure Based on Carboxyl-Bridged Tetrameric Water Clusters

2008 ◽  
Vol 2008 (10) ◽  
pp. 584-586 ◽  
Author(s):  
Fayan Meng ◽  
Yuanhong Jiao ◽  
Xuemei Chen ◽  
Lei Teng
Keyword(s):  
Thermogravimetric Analysis ◽  
Hydrogen Bonds ◽  
Water Loss ◽  
Self Assembly ◽  
Water Cluster ◽  
Room Temperature ◽  
Water Clusters ◽  
Three Dimensional ◽  
X Ray Diffraction ◽  
X Ray

A self-assembled, tetrameric water cluster stabilised by carboxyl-bridging has been characterised by X-ray diffraction studies and thermogravimetric analysis. Every water cluster is connected strongly via hydrogen bonds to four carboxyl oxygens of a terephthalate anion. The water rings are stable at room temperature, but when thermally decomposed, the water loss is irreversible.

3D Cd–MoS2 Porous Monolith Fabricated Through a Self-Assembly Between Cd2+ Cations and MoS2 Nanoflakes

NANO ◽  
2016 ◽  
Vol 11 (05) ◽  
pp. 1650053 ◽  
Author(s):  
Tianhao Ji ◽  
Lifeng Zou ◽  
Hongkun Xia ◽  
You Wu
Keyword(s):  
Self Assembly ◽  
Mesoporous Material ◽  
Room Temperature ◽  
Three Dimensional ◽  
High Adsorption ◽  
Adsorption Behaviors ◽  
Strong Adsorption ◽  
Measurement Results ◽  
Porous Monolith ◽  
Adsorption Capability

Three-dimensional (3D) Cd–MoS2 monolith was fabricated at room temperature using 2D MoS2 nanoflakes as precursor and Cd[Formula: see text] cations through an interaction between the S atoms on the surface of the MoS2 nanoflakes and the Cd[Formula: see text] cations. Then, the Cd–MoS2 was measured by various techniques. The measurement results show that, to some extent, the Cd–MoS2 structure is still amorphous like that of the MoS2 nanoflakes, and it is also a kind of mesoporous material with a mean diameter of 15.70[Formula: see text]nm and specific surface area of 22.01[Formula: see text]m2/g. The adsorption results of Rhodamine B and Cu[Formula: see text] solutions demonstrate that such material exhibits relatively strong adsorption behaviors and high adsorption capability, and also it can be reused for the adsorption after the adsorbates are taken out.

scholarly journals Conformal Self-Assembly of Nanospheres for Light-Enhanced Airtightness Monitoring and Room-Temperature Gas Sensing

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1829
Author(s):  
Qirui Liu ◽  
Yinlong Tan ◽  
Renyan Zhang ◽  
Yan Kang ◽  
Ganying Zeng ◽  
...  
Keyword(s):  
Plasma Treatment ◽  
Self Assembly ◽  
Room Temperature ◽  
Gas Sensing ◽  
Three Dimensional ◽  
Hydroxyl Groups ◽  
Universal Method ◽  
Feature Size ◽  
Simple Method ◽  
Hierarchical Architectures

The fabrication of conformal nanostructures on microarchitectures is of great significance for diverse applications. Here a facile and universal method was developed for conformal self-assembly of nanospheres on various substrates including convex bumps and concave holes. Hydrophobic microarchitectures could be transferred into superhydrophilic ones using plasma treatment due to the formation of numerous hydroxyl groups. Because of superhydrophilicity, the nanosphere suspension spread on the microarchitectures quickly and conformal self-assembly of nanospheres can be realized. Besides, the feature size of the conformal nanospheres on the substrates could be further regulated by plasma treatment. After transferring two-dimensional tungsten disulfide sheets onto the conformal nanospheres, the periodic nanosphere array was demonstrated to be able to enhance the light harvesting of WS2. Based on this, a light-enhanced room-temperature gas sensor with a fast recovery speed (<35 s) and low detecting limit (500 ppb) was achieved. Moreover, the WS2-covered nanospheres on the microarchitectures were very sensitive to the changes in air pressure due to the formation of suspended sheets on the convex bumps and concave holes. A sensitive photoelectronic pressure sensor that was capable of detecting the airtightness of vacuum devices was developed using the WS2-decorated hierarchical architectures. This work provides a simple method for the fabrication of conformal nanospheres on arbitrary substrates, which is promising for three-dimensional microfabrication of multifunctional hierarchical microarchitectures for diverse applications, such as biomimetic compound eyes, smart wetting surfaces and photonic crystals.

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