scholarly journals MXenes for future nanophotonic device applications

Nanophotonics ◽  
2020 ◽  
Vol 9 (7) ◽  
pp. 1831-1853
Author(s):  
Jaeho Jeon ◽  
Yajie Yang ◽  
Haeju Choi ◽  
Jin-Hong Park ◽  
Byoung Hun Lee ◽  
...  
Keyword(s):  
Solar Cells ◽  
Transition Metal ◽  
Wide Spectrum ◽  
Building Blocks ◽  
Optoelectronic Device ◽  
High Yield ◽  
Saturable Absorption ◽  
Nanophotonic Device ◽  
Wide Range ◽  
Device Applications

AbstractTwo-dimensional (2D) layers of transition metal carbides, nitrides, or carbonitrides, collectively referred to as MXenes, are considered as the new family of 2D materials for the development of functional building blocks for optoelectronic and photonic device applications. Their advantages are based on their unique and tunable electronic and optical properties, which depend on the modulation of transition metal elements or surface functional groups. In this paper, we have presented a comprehensive review of MXenes to suggest an insightful perspective on future nanophotonic and optoelectronic device applications based on advanced synthesis processes and theoretically predicted or experimentally verified material properties. Recently developed optoelectronic and photonic devices, such as photodetectors, solar cells, fiber lasers, and light-emitting diodes are summarized in this review. Wide-spectrum photodetection with high photoresponsivity, high-yield solar cells, and effective saturable absorption were achieved by exploiting different MXenes. Further, the great potential of MXenes as an electrode material is predicted with a controllable work function in a wide range (1.6–8 eV) and high conductivity (~104 S/cm), and their potential as active channel material by generating a tunable energy bandgap is likewise shown. MXene can provide new functional building blocks for future generation nanophotonic device applications.

scholarly journals Direct Synthesis of Oxynitride Nanowires through Atmospheric Pressure Chemical Vapor Deposition

Nanomaterials ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 2507
Author(s):  
Babak Adeli ◽  
Fariborz Taghipour
Keyword(s):  
Solid Solution ◽  
Vapor Deposition ◽  
Atmospheric Pressure ◽  
Wide Spectrum ◽  
Direct Synthesis ◽  
Chemical Vapor ◽  
Building Blocks ◽  
Operating Conditions ◽  
Wide Range ◽  
Pressure Chemical

Binary and ternary oxynitride solid alloys were studied extensively in the past decade due to their wide spectrum of applications, as well as their peculiar characteristics when compared to their bulk counterparts. Direct bottom-up synthesis of one-dimensional oxynitrides through solution-based routes cannot be realized because nitridation strategies are limited to high-temperature solid-state ammonolysis. Further, the facile fabrication of oxynitride thin films through vapor phase strategies has remained extremely challenging due to the low vapor pressure of gaseous building blocks at atmospheric pressure. Here, we present a direct and scalable catalytic vapor–liquid–solid epitaxy (VLSE) route for the fabrication of oxynitride solid solution nanowires from their oxide precursors through enhancing the local mass transfer flux of vapor deposition. For the model oxynitride material, we investigated the fabrication of gallium nitride and zinc oxide oxynitride solid solution (GaN:ZnO) thin film. GaN:ZnO nanowires were synthesized directly at atmospheric pressure, unlike the methods reported in the literature, which involved multiple-step processing and/or vacuum operating conditions. Moreover, the dimensions (i.e., diameters and length) of the synthesized nanowires were tailored within a wide range.

Transition Metal Catalyst, Solvent, Base Free Synthesis of Diaryl Diselenides under Mechanical Ball Milling

2021 ◽  
Vol 19 ◽  
Author(s):  
Debasish Kundu ◽  
Anup Roy ◽  
Subir Panja
Keyword(s):  
Transition Metal ◽  
Ball Milling ◽  
Room Temperature ◽  
General Procedure ◽  
Cross Coupling ◽  
High Yield ◽  
Metal Catalyst ◽  
Transition Metal Catalyst ◽  
Wide Range ◽  
Mechanical Ball Milling

Abstract: A convenient, efficient, and general procedure for the synthesis of diaryl diselenides has been developed by the reaction of aryl diazonium tetrafluoroborates and Potassium Selenocyanate on the surface of alumina under ball-milling in absence of any solvent, transition metal catalyst and base in room temperature. A wide range of functionalized diaryl diselenides are obtained in high purity and high yield by this procedure. Background: Synthesis of diaryl diselenides was restricted into only few Cu-catalyzed C-Se Cross coupling protocol where use of ligands, high reaction temp, long reaction time were required Objective: To achieve a sustainable protocol for the synthesis of diaryl diselenides Method: Reaction of aryl diazonium fluoroborate with KSeCN was successfully performed under ball milling in absence of any ransition metal catalyst, ligands, base and external heating to get diaryl diselenides. Results: A library of diaryl diselenides were obtained in good yields with different functional groups. Conclusion: First transition metal free protocol for the synthesis of diaryl diselenides has been developed successfully.

scholarly journals Electrochemical Exfoliation of 2D Advanced Carbon Derivatives

2020 ◽  
Author(s):  
Muhammad Ikram ◽  
Ali Raza ◽  
Sarfraz Ali ◽  
Salamat Ali
Keyword(s):  
Carbon Materials ◽  
Wide Spectrum ◽  
Low Cost ◽  
Chemical Properties ◽  
Building Blocks ◽  
Industrial Applications ◽  
High Yield ◽  
Electrochemical Exfoliation ◽  
2D Semiconductors ◽  
Comprehensive Survey

Advanced 2D carbon materials such as graphene and derivatives are basic building blocks for future nanostructured generation in electronics and energy horizons owing to their remarkable physical and chemical properties. In this context, production scalability of 2D materials having high purity with distinctive and multi-functionalities, that facilitate in fundamental research and advanced studies as well as in industrial applications. A variety of techniques have been employed to develop 2D advanced carbon materials, amongst state-of-the-art synthetic protocols, electrochemical is deliberated as a promising approach that provides high yield, great performance, low cost, and excellent up-scalability. Notably, playing with electrochemical parameters not only allows tunable properties but also enhances the content variety from graphene to a wide spectrum of 2D semiconductors. In this chapter, a succinct and comprehensive survey of recent progress in electrochemical exfoliation routes and presents the processing techniques, strategic design for exfoliations, mechanisms, and electrochemistry of graphene.

scholarly journals Transition Metal Catalyzed Azidation Reactions

Catalysts ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1173
Author(s):  
Roberto Sala ◽  
Camilla Loro ◽  
Francesca Foschi ◽  
Gianluigi Broggini
Keyword(s):  
Transition Metal ◽  
Materials Science ◽  
Building Blocks ◽  
Organic Azides ◽  
Wide Range ◽  
Carbon Carbon Bonds ◽  
Transition Metal Catalyzed ◽  
Vinyl Azides ◽  
Catalyzed Reactions ◽  
Metal Catalyzed

A wide range of methodologies for the preparation of organic azides has been reported in the literature for many decades, due to their interest as building blocks for different transformations and their applications in biology as well as in materials science. More recently, with the spread of the use of transition metal-catalyzed reactions, new perspectives have also materialized in azidation processes, especially concerning the azidation of C–H bonds and direct difunctionalization of multiple carbon-carbon bonds. In this review, special emphasis will be placed on reactions involving substrates bearing a leaving group, hydroazidation reactions and azidation reactions that proceed with the formation of more than one bond. Further reactions for the preparation of allyl and vinyl azides as well as for azidations involving the opening of a ring complete the classification of the material.

High-yield synthesis of “oriented attachment” TiO2 nanorods as superior building blocks of photoanodes in quantum dot sensitized solar cells

RSC Advances ◽  
2016 ◽  
Vol 6 (40) ◽  
pp. 33713-33722 ◽  
Author(s):  
Wenjun Zhang ◽  
Xianwei Zeng ◽  
Huan Wang ◽  
Rui Fang ◽  
Yao Xu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Hydrothermal Synthesis ◽  
Quantum Dot ◽  
Building Blocks ◽  
Tio2 Nanorods ◽  
Oriented Attachment ◽  
High Yield ◽  
Sensitized Solar Cells

In this paper, a high-yield hydrothermal synthesis of “oriented attachment” TiO2 nanorods (TiO2-NRs) and their application as a superior photoanode material in a quantum-dot (QD) sensitized solar cell have been reported.

Oxygen-Induced Defect-Healing and Photo-Brightening of Halide Perovskite Semiconductors: Science and Application

2021 ◽  
Author(s):  
Like Huang ◽  
Ziyi Ge ◽  
Xiaoli Zhang ◽  
Yuejin Zhu
Keyword(s):  
Solar Cells ◽  
Quantum Yield ◽  
Optoelectronic Device ◽  
Defect States ◽  
Defect Healing ◽  
Photoluminescence Quantum Yield ◽  
Metal Halide Perovskite ◽  
Device Applications ◽  
Halide Perovskite ◽  
Density Of Defect States

Solution-processed metal halide perovskite (MHP) semiconductors, have exhibited remarkable success in diverse optoelectronic device applications, especially in solar cells, despite having non-negligible density of defect states. The photoluminescence quantum yield...

scholarly journals 2D tellurene/black phosphorus heterojunctions based broadband nonlinear saturable absorber

Nanophotonics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 2593-2602 ◽  
Author(s):  
Bingzheng Yan ◽  
Guoru Li ◽  
Bingnan Shi ◽  
Junting Liu ◽  
Hongkun Nie ◽  
...  
Keyword(s):  
Continuous Wave ◽  
Building Blocks ◽  
Photonic Devices ◽  
Black Phosphorus ◽  
Laser Generation ◽  
Saturable Absorption ◽  
Solid State Lasers ◽  
Saturable Absorbers ◽  
Nonlinear Optical Absorption ◽  
Wide Range

AbstractTwo-dimensional (2D) mono-elemental materials (Xenes) show remarkable potential in the fields of fundamental science and technology, have been regarded as a wide range of building blocks for electronic technologies due to their unique chemical, physical, electrical, and optical properties. Here, 2D tellurene/black phosphorus (Te/BP) heterojunctions are successfully fabricated through liquid-phase exfoliation (LPE) method. Their nonlinear optical absorption properties at 1.0, 2.0, and 2.8 μm have been studied by an open-aperture Z-scan method. The results revealed the excellent broadband saturable absorption responses of the prepared BP/Te heterojunctions, which are further confirmed by using them as saturable absorbers (SAs) for passively Q-switched all-solid-state lasers operating at 1.0, 2.0, and 2.8 μm, respectively. In particular, 1.04 μm continuous-wave (CW) mode-locked lasers with a pulse width of 404 fs is realized for the first time, to our best knowledge. Our work indicates that 2D Xenes especially 2D Xenes based heterojunctions have great potential in the fields of pulsed laser generation/modulation and other optoelectronic and photonic devices.

scholarly journals A review on optoelectronic device applications of 2D Transition Metal Carbides and Nitrides

2021 ◽  
pp. 109452
Author(s):  
Xiwei Zhang ◽  
Jiahua Shao ◽  
Chenxi Yan ◽  
Ruijie Qin ◽  
Zhihui Lu ◽  
...  
Keyword(s):  
Transition Metal ◽  
Optoelectronic Device ◽  
Metal Carbides ◽  
Transition Metal Carbides ◽  
Device Applications

scholarly journals CuH-Catalyzed Enantioselective Ketone Allylation with 1,3-Dienes: Scope, Mechanism, and Applications

2018 ◽  
Author(s):  
Chengxi Li ◽  
Richard Liu ◽  
Luke T. Jesikiewicz ◽  
Yang Yang ◽  
Peng Liu ◽  
...  
Keyword(s):  
Density Functional ◽  
Building Blocks ◽  
Biologically Active ◽  
High Yield ◽  
Organometallic Reagents ◽  
Carbon Nucleophiles ◽  
Homoallylic Alcohols ◽  
Alcohol Synthesis ◽  
Wide Range ◽  
Pharmaceutical Agents

<p>Chiral tertiary alcohols are important building blocks for the synthesis of pharmaceutical agents and biologically active natural products. The addition of carbon nucleophiles to ketones is the most common approach to tertiary alcohol synthesis, but traditionally relies on stoichiometric organometallic reagents that are difficult to prepare, sensitive, and uneconomical. We describe a mild and efficient method for the copper-catalyzed allylation of ketones, using widely available 1,3-dienes as allylmetal surrogates. Homoallylic alcohols bearing a wide range of functional groups are obtained in high yield and with good regio-, diastereo-, and enantioselectivity. Mechanistic investigations using density functional theory (DFT) implicate the in situ formation of a rapidly equilibrating mixture of isomeric copper(I) allyl complexes, from which Curtin-Hammett kinetics determine the major isomer of product. A stereochemical model is provided to explain the high diastereo- and enantioselectivity of this process. Finally, this method was applied toward the preparation of an important drug, (R)-Procyclidine, and a key intermediate in the synthesis of several pharmaceuticals.</p> <br>

Chemoselective and Metal-Free Synthesis of Aryl Esters from the Corresponding Benzylic Alcohols in Aqueous Medium Using TBHP/TBAI as an Efficient Catalytic System

Synlett ◽  
2018 ◽  
Vol 29 (16) ◽  
pp. 2208-2212
Author(s):  
Sanjay Bhar ◽  
Sneha Nandy ◽  
Avishek Ghatak ◽  
Asit Das
Keyword(s):  
Transition Metal ◽  
Catalytic Amount ◽  
High Yield ◽  
Primary Alcohols ◽  
Benzylic Alcohols ◽  
Metal Free ◽  
Tishchenko Reaction ◽  
Tert Butyl Hydroperoxide ◽  
Wide Range ◽  
Tetrabutylammonium Iodide

A novel and transition-metal-free strategy has been developed for the synthesis of aryl esters starting from corresponding benzylic primary alcohols as the exclusive substrates using tert-butyl hydroperoxide (TBHP) as a terminal oxidant in the presence of catalytic amount of tetrabutylammonium iodide (TBAI) and imidazole, where the aliphatic alcohols remained unaffected. These reactions are highly chemoselective and associated with high yield and wide applicability accommodating a wide range of substituents. Excellent chemoselectivity has also been demonstrated through intramolecular competition experiments. This protocol can be considered as an important analogue of Tishchenko reaction using benzylic alcohols as the substrates instead of benzaldehydes.

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