scholarly journals Amorphous Sb2S3 Nanospheres In-Situ Grown on Carbon Nanotubes: Anodes for NIBs and KIBs

Nanomaterials ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 1323 ◽  
Author(s):  
Meng Li ◽  
Fengbin Huang ◽  
Jin Pan ◽  
Luoyang Li ◽  
Yifan Zhang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Self Assembly ◽  
Diffraction Field ◽  
Charge Capacity ◽  
High Charge ◽  
Assembly Method ◽  
Transmission Electron ◽  
One Step ◽  
A Charge

Antimony sulfide (Sb2S3) with a high theoretical capacity is considered as a promising candidate for Na-ion batteries (NIBs) and K-ion batteries (KIBs). However, its poor electrochemical activity and structural stability are the main issues to be solved. Herein, amorphous Sb2S3 nanospheres/carbon nanotube (Sb2S3/CNT) nanocomposites are successfully synthesized via one step self-assembly method. In-situ growth of amorphous Sb2S3 nanospheres on the CNTs is confirmed by X-ray diffraction, field-emission scanning electron microscopy, and transmission electron microscopy. The amorphous Sb2S3/CNT nanocomposites as an anode for NIBs exhibit excellent electrochemical performance, delivering a high charge capacity of 870 mA h g−1 at 100 mA g−1, with an initial coulomb efficiency of 77.8%. Even at 3000 mA g−1, a charge capacity of 474 mA h g−1 can be achieved. As an anode for KIBs, the amorphous Sb2S3/CNT nanocomposites also demonstrate a high charge capacity of 451 mA h g−1 at 25 mA g−1. The remarkable performance of the amorphous Sb2S3/CNT nanocomposites is attributed to the synergic effects of the amorphous Sb2S3 nanospheres and 3D porous conductive network constructed by the CNTs.

scholarly journals Zig-zag Self-assembly of Magnetic Octahedral Fe3O4 Nanocrystals using in situ Liquid Transmission Electron Microscopy

2016 ◽  
Vol 22 (S5) ◽  
pp. 36-37
Author(s):  
Arnaud Demortiere ◽  
Charudatta Phatak ◽  
Andras Kovacs ◽  
Jan Caron ◽  
Nikita Repnin ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Self Assembly ◽  
Transmission Electron

scholarly journals Functionality of TERGO Powders during the Synthesis of PANI-Based Composites for Electrical Devices

2019 ◽  
Vol 2019 ◽  
pp. 1-17
Author(s):  
M. A. Domínguez-Crespo ◽  
A. B. López-Oyama ◽  
A. M. Torres-Huerta ◽  
A. R. Hernández-Basilio ◽  
D. Palma-Ramírez ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Fine Particles ◽  
In Situ Polymerization ◽  
Hybrid Composites ◽  
Physical Interaction ◽  
Step Potential ◽  
Transmission Electron ◽  
Electrochemically Reduced Graphene Oxide ◽  
One Step

In this work, hybrid composites were prepared using polyaniline (PANI) and electrochemically reduced graphene oxide (ERGO) by in situ polymerization. ERGO powders were obtained by a two-way route, Hummer’s method, and one-step potential (−2 V) followed by annealing process at 400°C (TERGO powders): different quantities of TERGO fine particles (10, 20, and 30 wt%) were added to the in situ PANI polymerization in order to produce the hybrid composites. The morphology and structure of the PANI/TERGO compounds were characterized by Raman spectroscopy, ultraviolet-visible spectroscopy (UV-Vis), X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Thermal treatment of ERGO powders pointed out high-defect surfaces with a wrinkle-type morphology (ID/IG ratio~0.90). The emeraldine phase of PANI was obtained with a maximum value of 61%, which decreases with the amount of TERGO powders. It is also seen that composites displayed a combined morphology between PANI matrix and TERGO powders, confirming a physical interaction between both morphologies. The amount of TERGO particles into the polymeric matrix also modifies the sample microstructure from a semispherical shape to extend sheets, where PANI is sandwiched between TERGO layers. Electrical conductivity of composites slightly increases independent of the TERGO amount (30 S/m and 39 S/m) due to the rough TERGO surface that conditioned the homogeneous nucleation of a large amount of polymer (PANI) reducing the area to move the electrical charge.

Synthesis, Characterization and Catalytic Properties of Monometal/SiO2 and Bimetal/SiO2 Hollow Spheres with Mesoporous Structure

NANO ◽  
2017 ◽  
Vol 12 (12) ◽  
pp. 1750148 ◽  
Author(s):  
Xinzhi Sun ◽  
Fanglin Du
Keyword(s):  
Electron Microscopy ◽  
Hollow Spheres ◽  
Mesoporous Structure ◽  
Hydrogen Atmosphere ◽  
Hydrothermal Conditions ◽  
Reaction Conditions ◽  
Transmission Electron ◽  
One Step ◽  
Temperature Programmed

Monometallic M1(M[Formula: see text] Ni/Cu/Fe/Co) silicates and bimetallic Ni–M2(M[Formula: see text] Cu/Fe/Co) silicates hollow spheres with mesoporous structure and the controllable morphology have been synthesized successfully via one-step sacrificial template method under hydrothermal conditions. The catalysts were obtained by reducing the corresponding silicates in situ under the hydrogen atmosphere at a certain temperature. All the silicates and the catalysts M1/SiO2 and Ni–M2/SiO2 hollow spheres have been characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET) and temperature-programmed reduction (TPR) thoroughly and systematically. The morphology and reaction conditions of bimetallic Ni–M2 silicates hollow spheres depend on the second metal M2, which has been verified by SEM, TEM and XRD. From the results, it can be concluded that bimetallic silicates possess better physical properties in favor of the catalytic activity. Bimetallic Ni–M2/SiO2 hollow spheres had higher catalytic property than the monometallic M1/SiO2 and the conversion of nitrobenzene could reach 100% within 3[Formula: see text]h using Ni–Cu/SiO2 and Ni–Fe/SiO2 hollow spheres as catalysts.

Quantitative in situ hot-stage high-resolution Transmission Electron Microscopy

1994 ◽  
Vol 52 ◽  
pp. 758-759
Author(s):  
J. M. Howe
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Interfacial Structure ◽  
Interface Motion ◽  
Charge Coupled Device ◽  
Transmission Electron ◽  
Interface Theory ◽  
A Charge

In situ hot-stage high-resolution transmission electron microscopy (HRTEM) provides unique capabilities for quantifying the dynamics of interfaces at the atomic level. Such information complements detailed static observations and calculations of interfacial structure, and is essential for understanding interface theory and solid-state phase transformations. This paper provides a brief description of particular requirements for performing in situ hot-stage HRTEM and illustrates the use of this technique to obtain quantitative data on the atomic mechanisms and kinetics of interface motion during precipitation of {111} θ phase in an Al-Cu-Mg-Ag alloy.The specimen and microscope requirements for in situ hot-stage HRTEM are not much different from those of static HRTEM, except that one must have a heating holder and equipment for recording and analyzing dynamic images. At present, most HRTEMs are equipped with a TV-rate camera, possibly combined with a charge-coupled device camera. An inexpensive way to record in situ HRTEM images is to send the output from the TV-rate camera directly into a standard VHS format videocassette recorder (VCR).

Synthesis and Characterization of Polyaniline Microspheres Doped with Ferrocene Sulfonic Acid

2007 ◽  
Vol 121-123 ◽  
pp. 215-218
Author(s):  
Dan Ming Chao ◽  
J.Y. Chen ◽  
Xiao Feng Lu ◽  
Wan Jin Zhang
Keyword(s):  
Electron Microscopy ◽  
Self Assembly ◽  
Sulfonic Acid ◽  
Average Diameter ◽  
Ammonium Persulfate ◽  
Molar Ratio ◽  
Assembly Method ◽  
Transmission Electron ◽  
Backbone Structure

With an average diameter of 300-500 nm, conducting microspheres of polyaniline (PANI) were synthesized successfully by a self-assembly method in the presence of ferrocene sulfonic acid (FcSO3H) as the dopant, and ammonium persulfate ((NH4)2S2O8) as the oxidant. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) proved that the microspheres of PANI- FcSO3H synthesized by a self-assembly process were hollow ones. And the backbone structure of obtained PANI- FcSO3H was characterized by FTIR spectrum. The effect of synthetic conditions, such as the molar ratio of FcSO3H to aniline (An) and the reaction temperature, on the morphology and size was also investigated.

Fabrication and Characterization of Perovskite Nanocube Ordering Structures via Capillary-Force-Assisted Self-Assembly Process

2013 ◽  
Vol 566 ◽  
pp. 285-288 ◽  
Author(s):  
Kenichi Mimura ◽  
Feng Dang ◽  
Kazumi Kato ◽  
Hiroaki Imai ◽  
Satoshi Wada ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Self Assembly ◽  
Capillary Force ◽  
Piezoresponse Force Microscopy ◽  
X Ray Diffraction ◽  
Ordered Structures ◽  
Force Microscopy ◽  
Assembly Method ◽  
Transmission Electron

Barium titanate (BT) and strontium titanate (ST) nanocubes which have been synthesized by hydrothermal method with surfactants were assembled in order directly on the substrates by using capillary-force-assisted self-assembly method. The ordered structures, crystallinity and orientation of the nanocubes were evaluated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), scanning probe microscopy (SPM) and X-ray diffraction (XRD). The piezoresponse properties of the nanocubes ordering structures characterized by Piezoresponse Force Microscopy (PFM) seemed to depend on the constituents and their interface.

In Situ WetSTEM Observation of Gold Nanorod Self-Assembly Dynamics in a Drying Colloidal Droplet

2014 ◽  
Vol 20 (2) ◽  
pp. 385-393 ◽  
Author(s):  
Filip Novotný ◽  
Petr Wandrol ◽  
Jan Proška ◽  
Miroslav Šlouf
Keyword(s):  
Electron Microscopy ◽  
Self Assembly ◽  
Direct Method ◽  
Local Heating ◽  
Ex Situ ◽  
Transmission Electron ◽  
Nanoparticle Interactions ◽  
Scanning Transmission ◽  
Important Challenge

AbstractDirect in situ visualization of nanoparticles in a liquid is an important challenge of modern electron microscopy. The increasing significance of bottom-up methods in nanotechnology requires a direct method to observe nanoparticle interactions in a liquid as the counterpart to the ex situ electron microscopy and indirect scattering and spectroscopy methods. Especially, the self-assembly of anisometric nanoparticles represents a difficult task, and the requirement to trace the route and orientation of an individual nanoparticle is of highest importance. In our approach we utilize scanning transmission electron microscopy under environmental conditions to visualize the mobility and self-assembly of cetyltrimethylammonium bromide (CTAB)-capped gold nanorods (AuNRs) in an aqueous colloidal solution. We directly observed the drying-mediated AuNR self-assembly in situ during rapid evaporation of a colloidal droplet at 4°C and pressure of about 900 Pa. Several types of final AuNR packing were documented including side-by-side oriented chains, tip-to-tip loosely arranged nanorods, and domains of vertically aligned AuNR arrays. The effect of local heating by electron beam is used to qualitatively asses the visco-elastic properties of the formed AuNR/CTAB/water membrane. Local heating induces the dehydration and contraction of a formed membrane indicated either by its rupture and/or by movement of the embedded AuNRs.

Fabrication and characterization of hydroxyapatite/collagen bone-like nanocomposite through a self-assembly method

2012 ◽  
Vol 19 (2) ◽  
pp. 177-182 ◽  
Author(s):  
Zhenlin Wang ◽  
Yuhua Yan ◽  
Tao Wan
Keyword(s):  
Electron Microscopy ◽  
Self Assembly ◽  
Chemical Interaction ◽  
Precipitation Method ◽  
Native Bone ◽  
Assembly Method ◽  
Assembly Mechanism ◽  
Transmission Electron ◽  
Large Numbers ◽  
Co Precipitation

AbstractBased on a self-assembly mechanism, a co-precipitation method was utilized to fabricate bone-like biomimetic nanocomposite with a simplified preparation approach and accessible materials to investigate in depth some characteristics of hydroxyapatite/collagen(HAp/Col) nanocomposite for the elucidation of performances in some respects. The as-prepared composite was characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Fourier transformation infrared spectroscopy, and thermal analysis. The results show that HAp nanocrystals formed as preferentially oriented slender needles 50–100 nm in length on a felt-like Col matrix which is composed of large numbers of randomly oriented Col fibers and showed polycrystalline behavior. The as-prepared cellular composites are analogous in both composition and nanostructured architecture to native bone, longer aging time promotes the growth and purification of nano-HAp on Col, and characterization confirms that chemical interaction occurs and causes intimate bonding between HAp and Col.

Antibacterial Activity and Stability of the Electrospun Antibacterial Polymer/Silver Nanoparticle Nanohybrid Mats

2016 ◽  
Vol 848 ◽  
pp. 538-542
Author(s):  
Jin Hui Wu ◽  
Run Ze Wang ◽  
Li Mei Hao ◽  
Ying Yi ◽  
Ming Zhao ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Poly Vinyl Alcohol ◽  
Spectroscopy Analysis ◽  
Spectra Analysis ◽  
Transmission Electron ◽  
Bactericidal Effects ◽  
One Step ◽  
Scanning Electron

In our previous work, silver nanoparticles (AgNPs) with ultrasmall sizes (4.3 ± 0.7 nm) can be in-situ obtained within the poly (vinyl alcohol) (PVA) fibers by mediating the electro-spun conditions. The obtained AgNPs “trapped” within the electro-spun PVA nanofibers were believed to be stable in the dry state, as the abundant PVA molecules could protect the dispersed AgNPs from agglomerating with each other. In this study, based on former study, aging tests about the nanohybrid mats were performed. Through ATR-FTIR spectra analysis, the formation mechanism of AgNPs within the PVA nanofiber by one-step electro-spun was confirmed. Atomic Absorption Spectroscopy analysis of the as-prepared PVA-Ag samples was performed in 14 h and the release of Ag+ was believed to be the main cause of its bactericidal effects. Scanning electron microscopy and transmission electron microscopy were used to characterize the nanofibers with AgNPs. After 4-month storage, the size of AgNPs doped in the PVA nanofiber became twice larger and the content of AgNPs was almost doubled.

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