scholarly journals Stretchable and self-healable organometal halide perovskite nanocrystal-embedded polymer gels with enhanced luminescence stability

Nanophotonics ◽  
2018 ◽  
Vol 7 (12) ◽  
pp. 1949-1958 ◽  
Author(s):  
Minjie Fang ◽  
Sihui Huang ◽  
Dong Li ◽  
Chunli Jiang ◽  
Pei Tian ◽  
...  
Keyword(s):  
Blue Emission ◽  
Polymer Gels ◽  
Optical Devices ◽  
Self Healing ◽  
Organometal Halide Perovskite ◽  
Enhanced Luminescence ◽  
Halide Perovskite ◽  
The One ◽  
Photoluminescent Materials ◽  
Luminescent Polymer

AbstractStretchable and self-healing polymer gels with luminescent property are very promising materials for next generation soft optical devices. This work presents the preparation of self-healing and luminescent polymer gels by simply blending organometal halide perovskite nanocrystals (OHP NCs) with poly(dimethylsiloxane)-urea copolymer (PDMS-urea). On the one hand, the obtained luminescent gels are not only flexible, stretchable and relatively transparent, they also exhibit excellent self-healing capability due to the reversible hydrogen bonding network in the PDMS-urea copolymer. On the other hand, the embedding of OHP NCs (MAPbBr3 and MAPbI3 NCs) inside the hydrophobic PDMS-urea gel greatly improved the photoluminescence stability of OHP NCs against water. Their applications as phosphors for LEDs have been demonstrated. Both the MAPbBr3/PDMS-urea gel and MAPbI3/PDMS-urea gel can fully convert the blue emission of GaN chip to green and red emissions, respectively. These gels can be used as photoluminescent materials in flexible optical devices with good self-healing capability.

Self-Healing and Repairing Concrete Cracks Based on Bio-Mineralization

2014 ◽  
Vol 629-630 ◽  
pp. 494-503 ◽  
Author(s):  
Chun Xiang Qian ◽  
Mian Luo ◽  
Li Fu Ren ◽  
Rui Xing Wang ◽  
Rui Yang Li ◽  
...  
Keyword(s):  
Concrete Surface ◽  
Cellular Respiration ◽  
Self Healing ◽  
Capillary Suction ◽  
Water Permeation ◽  
Carbonate Ions ◽  
Micro Cracks ◽  
Small Cracks ◽  
The Common ◽  
The One

In this paper, three bio-mineralization mechanisms were proposed to repair cement-based materials cracks. The common feature is that the three are all induced by bacterial. A type of bacterial which can decompose urea and release carbonate ions could be applied to repair micro cracks on concrete surface when combining calcium ions. But what need to be noted is that the way of repairing cracks is passive. Some alkaliphilic bacterial spores could be added to concrete when casted and two different types of bacterial were used to realize the function of self-healing. The sources of carbonate ions made them different, the one release carbonate dioxide through its own cellular respiration, the other could transfer carbon dioxide in air to bicarbonate. Coefficient of capillary suction, apparent water permeation coefficient and area repairing rate were applied to characterize the repairing effectiveness. The tests results were that all three bio-mineralization mechanisms showed excellent repair effect to small cracks formed at early ages. When the bacteria were immobilized by ceramsite, the self-healing effect could be improved for the cracks formed at late ages.

Thermally Stable Copper(II)-Doped Cesium Lead Halide Perovskite Quantum Dots with Strong Blue Emission

2019 ◽  
Vol 10 (5) ◽  
pp. 943-952 ◽  
Author(s):  
Chenghao Bi ◽  
Shixun Wang ◽  
Qiang Li ◽  
Stephen V. Kershaw ◽  
Jianjun Tian ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Blue Emission ◽  
Thermally Stable ◽  
Perovskite Quantum Dots ◽  
Strong Blue Emission ◽  
Halide Perovskite ◽  
Lead Halide

An organometal halide perovskite photocathode integrated with a MoS2 catalyst for efficient and stable photoelectrochemical water splitting

2021 ◽  
Author(s):  
Hojoong Choi ◽  
Sehun Seo ◽  
Ju-Hyeon Kim ◽  
Jong-Hoon Lee ◽  
Seungkyu Kim ◽  
...  
Keyword(s):  
Water Splitting ◽  
Conversion Efficiency ◽  
Photoelectrochemical Water Splitting ◽  
Half Cell ◽  
Organometal Halide Perovskite ◽  
Halide Perovskite ◽  
Mos2 Catalyst

An organometal halide perovskite (OHP) photocathode integrated with a MoS2 catalyst achieved long-term photoelectrochemical (PEC) stability and high half-cell solar-to-hydrogen conversion efficiency (HC-STH).

Size Dependence of Charge Carrier Dynamics in Organometal Halide Perovskite Nanocrystals: Deciphering Radiative Versus Nonradiative Components

2019 ◽  
Vol 123 (7) ◽  
pp. 4610-4619 ◽  
Author(s):  
Sara Bonabi Naghadeh ◽  
Binbin Luo ◽  
Ying-Chih Pu ◽  
Zachary Schwartz ◽  
William R. Hollingsworth ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Size Dependence ◽  
Carrier Dynamics ◽  
Perovskite Nanocrystals ◽  
Charge Carrier Dynamics ◽  
Organometal Halide Perovskite ◽  
Halide Perovskite

Screening of Different Encapsulated Polymer-Based Healing Agents for Chloride Exposed Self-Healing Concrete Using Chloride Migration Tests

2018 ◽  
Vol 761 ◽  
pp. 152-158 ◽  
Author(s):  
Philip van den Heede ◽  
Bjorn van Belleghem ◽  
Maria Adelaide Araújo ◽  
João Feiteira ◽  
Nele de Belie
Keyword(s):  
Service Life ◽  
High Viscosity ◽  
Cementitious Materials ◽  
Self Healing ◽  
Polymer Precursor ◽  
Marine Environments ◽  
Steel Reinforced Concrete ◽  
Low Viscosity ◽  
Chloride Migration ◽  
The One

The service life of steel reinforced concrete in aggressive marine environments could be increased substantially by embedding a self-healing mechanism that ensures autonomous healing of cracks upon their occurrence. Previous proof-of-concept experiments have shown that the incorporation of encapsulated polymer-based healing agents (HAs) counts as a very appropriate way to achieve this goal. Over the years, several polymer-precursor-capsule systems have been developed in that perspective at our laboratory. Cementitious materials containing either commercial or in-house developed encapsulated HAs have been subjected to preliminary feasibility tests (water absorption, permeability tests, etc.). However, these experiments did not yet allow for a fast and straightforward assessment of the self-healing efficiency (SHE) in relation to the expected durability and service life performance of the material. This approach would have many advantages when having to select the most suitable polymer-precursor-capsule system for a particular concrete application. In this paper, a modified chloride migration test based on the one prescribed in NT Build 492 has been proposed to support the development of self-healing concrete for marine environments. Four polymer-based HAs have been screened that way, i.e. an in-house developed high-viscosity polyurethane (PU) precursor, a commercial low-viscosity PU precursor, the same commercial PU precursor with addition of accelerator and benzoyl peroxide (BPO), and an in-house developed 2-component acrylate-endcapped precursor + cross-linker. For now, a highly repeatable SHE value of 100% could only be obtained for the second option.

Cs incorporation via sequential deposition for stable and scalable organometal halide perovskite solar cells

2022 ◽  
Vol 520 ◽  
pp. 230783
Author(s):  
Dae Woo Kim ◽  
Eui Dae Jung ◽  
Chung Hyeon Jang ◽  
Ji A. Hong ◽  
Hye Seung Kim ◽  
...  
Keyword(s):  
Solar Cells ◽  
Perovskite Solar Cells ◽  
Sequential Deposition ◽  
Organometal Halide Perovskite ◽  
Halide Perovskite
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