scholarly journals Effects of Crystallinity on the Photocatalytic Polymerization of 3,4-Ethylenedioxythiophene over CsPbBr3 Inverse Opals

Catalysts ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1331
Author(s):  
Siwei Zhao ◽  
Shaohua Jin ◽  
Huanmin Liu ◽  
Shengfu Li ◽  
Kun Chen
Keyword(s):  
Colloidal Crystal ◽  
Three Dimensional ◽  
Inverse Opal ◽  
Porous Structures ◽  
Novel Approach ◽  
Transmission Electron ◽  
Hierarchical Porous ◽  
Antisolvent Crystallization ◽  
Colloidal Crystal Templating ◽  
High Absorption Coefficient

Due to their high absorption coefficient and long carrier lifetime, halide perovskites are promising candidates for photocatalysts. For this study, the antisolvent crystallization protocol and the colloidal crystal templating approach were combined to fabricate the highly crystalline cesium lead bromide perovskite with inverse opal morphology (IO-CsPbBr3). Scanning electron microscopy and transmission electron microscope images demonstrate the three-dimensional well-ordered porous structures of the IO-CsPbBr3 and their single-crystalline features. The presented approach not only provides hierarchical porous structures but also enhances overall crystallinity. When used as catalysts to promote the polymerization of 2,2′,5′,2″-ter-3,4-ethylenedioxythiophene, the highly crystalline IO-CsPbBr3 exhibits a superior photocatalytic performance compared to its polycrystalline counterpart. Furthermore, the morphology and the crystalline structure of the highly crystalline IO-CsPbBr3 are well preserved under photocatalytic conditions. This novel approach enables the preparation of a halide perovskite inverse opal with high crystallinity.

Fabrication of nitrogen-doped hierarchical porous carbons from Sargassum as advanced electrode materials for supercapacitors

2021 ◽  
Author(s):  
Feiqiang Guo ◽  
Yinbo Zhan ◽  
Xiaopeng Jia ◽  
Huiming Zhou ◽  
Shuang Liang ◽  
...  
Keyword(s):  
High Performance ◽  
Nitrogen Doping ◽  
Electrode Materials ◽  
Three Dimensional ◽  
Koh Activation ◽  
Porous Carbons ◽  
Nitrogen Doped ◽  
Novel Approach ◽  
Hierarchical Porous ◽  
Hierarchical Porous Carbons

Using Sargassum as the precursor, a novel approach was developed to synthesize three-dimensional porous carbons as high-performance electrode materials for supercapacitors via KOH activation and subsequent nitrogen-doping employing melamine as...

scholarly journals CTAB-Assisted Hydrothermal Synthesis of WO3Hierarchical Porous Structures and Investigation of Their Sensing Properties

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Dan Meng ◽  
Guosheng Wang ◽  
Xiaoguang San ◽  
Yanbai Shen ◽  
Guodong Zhao ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Nitrogen Adsorption ◽  
Fast Response ◽  
Photoelectron Spectra ◽  
Porous Structures ◽  
X Ray ◽  
Transmission Electron ◽  
Hierarchical Porous ◽  
Adsorption Desorption ◽  
Higher Sensitivity

WO3hierarchical porous structures were successfully synthesized via cetyltrimethylammonium bromide- (CTAB-) assisted hydrothermal method. The structure and morphology were investigated using scanning electron microscope, X-ray diffractometer, transmission electron microscopy, X-ray photoelectron spectra, Brunauer-Emmett-Teller nitrogen adsorption-desorption, and thermogravimetry and differential thermal analysis. The result demonstrated that WO3hierarchical porous structures with an orthorhombic structure were constructed by a number of nanoparticles about 50–100 nm in diameters. The H2gas sensing measurements showed that well-defined WO3hierarchical porous structures with a large specific surface area exhibited the higher sensitivity compared with products without CTAB at all operating temperatures. Moreover, the reversible and fast response to H2gas and good selectivity were obtained. The results indicated that the WO3hierarchical porous structures are promising materials for gas sensors.

Structure and Nanocrystallites of Ni and NiO Three Dimensional Ordered Macromeshes

2001 ◽  
Vol 703 ◽  
Author(s):  
W.L. Zhou ◽  
L. Xu ◽  
A.A. Zakhidov ◽  
R.H. Baughman ◽  
J.B. Wiley
Keyword(s):  
Electron Microscope ◽  
Three Dimensional ◽  
Temperature Treatment ◽  
Inverse Opal ◽  
Preferential Growth ◽  
Transmission Electron ◽  
Higher Temperature ◽  
Ordered Macroporous ◽  
Nio Nanocrystals ◽  
20 Nm

ABSTRACTThree dimensional Ni and NiO inverse opal macromeshes were characterized by scanning electron microscope (SEM) and transmission electron microscope (SEM). The octahedral cubes of the macroporous Ni were found mostly grown as single crystals with staking faults and microtwins. There was no preferential growth of these cubes as determined by selected area diffraction pattern (SADP). Some NiO nanocrystals with size of about 5 nm were formed on the surface of inverse Ni opal membrane during etching away of silica spheres. The oxidation of Ni mesh turned it into NiO macromesh with grain size of about 20 nm at 550°C. The nanocrystalline NiO mesh is suitable for further fabrication of three dimensional nanobeads. By annealing the meshes at 650°C, the NiO nanograins grew to a size of over 50 nm. This three dimensional ordered macroporous structure with higher temperature treatment is considered as stable and important for further application.

Preparation of three-dimensional inverse opal SnO2/graphene composite microspheres and their enhanced photocatalytic activities

2015 ◽  
Vol 3 (6) ◽  
pp. 2991-2998 ◽  
Author(s):  
Lechen Chen ◽  
Lizhao Xie ◽  
Mozhen Wang ◽  
Xuewu Ge
Keyword(s):  
Colloidal Crystal ◽  
Three Dimensional ◽  
Inverse Opal ◽  
Graphene Composite ◽  
Composite Microspheres ◽  
Photocatalytic Activities

3D inverse opal SnO2/graphene composite microspheres with enhanced photocatalytic activities were first prepared using polystyrene colloidal crystal balls as a template.

MORPHOLOGICALLY CONTROLLED ELECTRODEPOSITION OF ZnO AND Cu2O BY THE COLLOIDAL CRYSTAL TEMPLATE METHOD

2009 ◽  
Vol 18 (04) ◽  
pp. 611-616 ◽  
Author(s):  
MING FU ◽  
AILUN ZHAO ◽  
JI ZHOU ◽  
DAWEI HE ◽  
YONGSHENG WANG
Keyword(s):  
Electrochemical Method ◽  
Colloidal Crystal ◽  
Colloidal Crystals ◽  
Template Method ◽  
Inverse Opal ◽  
Macroporous Materials ◽  
Colloidal Crystal Template ◽  
Colloidal Crystal Templating

This paper presents a versatile method for fabricating 3D macroporous materials using colloidal crystals as the templates. ZnO and Cu2O were deposited by the electrochemical method via the colloidal crystal template. Not only were 3D inverse opal structures and 2D nanobowls fabricated, but nanoparticles with a controlled shape were also prepared. Morphological controls via colloidal crystal templating are discussed.

Chitosan bionanocomposites prepared in the self-organized regime

2015 ◽  
Vol 87 (8) ◽  
pp. 793-803 ◽  
Author(s):  
Irina Postnova ◽  
Sergei Sarin ◽  
Vladimir Silant’ev ◽  
Chang-Sik Ha ◽  
Yury Shchipunov
Keyword(s):  
Three Dimensional ◽  
Multiwall Carbon Nanotubes ◽  
The Self ◽  
Clay Nanoparticles ◽  
Self Organized ◽  
X Ray Scattering ◽  
Novel Approach ◽  
Transmission Electron ◽  
Dimensional Network ◽  
Multiwall Carbon

AbstractBionanocomposites in the self-organized regime are prepared when chitosan is gradually charged in the course of progressive change of pH by hydrolyzing D-glucono-δ-lactone in solutions of nanoparticles bearing negative charges on their surface. This novel approach is applicable to the formation of monolithic hydrogels and films. Here bionanocomposites of chitosan with clay nanoparticles of saponite and sepiolite having various geometry and with oxidized multiwall carbon nanotubes are considered. Structural organization of hydrogels and films is studied by scanning and transmission electron microscopy as well as small angle X-ray scattering. Jellification is caused by generation of three-dimensional network from fibrils, whereas films have pronounced stratified layer (nacre-like) structure from stacked nanoparticles and aligned chitosan macromolecules. Special attention is paid to mechanical properties of films that are improved drastically with introducing nanoparticles.

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