Plasmonic Ag ‐ ZnO : Charge Carrier Mechanisms and Photocatalytic Applications*

Hierarchical nanostructures of ZnO/CuO and the effects of amine ligands on their structure, formation and photocatalytic applications were investigated.

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Review on bimetallic-deposited TiO2: preparation methods, charge carrier transfer pathways and photocatalytic applications

Chemical Papers ◽

10.1007/s11696-019-00995-4 ◽

2019 ◽

Vol 74 (3) ◽

pp. 717-756 ◽

Cited By ~ 7

Author(s):

R. Kavitha ◽

S. Girish Kumar

Keyword(s):

Charge Carrier ◽

Preparation Methods ◽

Carrier Transfer ◽

Photocatalytic Applications

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Tungsten-based nanomaterials (WO 3 & Bi 2 WO 6 ): Modifications related to charge carrier transfer mechanisms and photocatalytic applications

Applied Surface Science ◽

10.1016/j.apsusc.2015.07.003 ◽

2015 ◽

Vol 355 ◽

pp. 939-958 ◽

Cited By ~ 187

Author(s):

S. Girish Kumar ◽

K.S.R. Koteswara Rao

Keyword(s):

Charge Carrier ◽

Carrier Transfer ◽

Photocatalytic Applications ◽

Transfer Mechanisms

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Synthesis of ZnO/ZnFe2O4 nanocomposites in organic-free media and their photocatalytic activity under natural sunlight

JOURNAL OF MECHANICAL ENGINEERING AND SCIENCES ◽

10.15282/jmes.14.2.2020.20.0532 ◽

2020 ◽

Vol 14 (2) ◽

pp. 6801-6810

Author(s):

Rahmayeni Rahmayeni ◽

Zulhadjri Zulhadjri ◽

Yeni Stiadi ◽

Agusnar Harry ◽

Syukri Arief

Keyword(s):

Electron Microscopy ◽

Hexagonal Wurtzite Structure ◽

Rice Grain ◽

X Ray Diffraction ◽

Homogeneous Sphere ◽

Natural Sunlight ◽

Transmission Electron ◽

Photocatalytic Activities ◽

Free Media ◽

Photocatalytic Applications

Nanocomposite ZnO/ZnFe2O4 photocatalysts with different proportions of ZnFe2O4 were synthesized in organic-free media using metal nitric as precursors. The ZnO phase with hexagonal wurtzite structure and low crystallinity of ZnFe2O4 was confirmed using XRD (X-Ray diffraction). Different morphologies of the nanocomposites were obtained ranging from rice grain-like with a porous surface to homogeneous sphere-like nanoparticles as shown in Scanning Electron Microscopy (SEM) and TEM Transmission Electron Microscopy (TEM) studies. Magnetic properties measured by Visible Sampler Magnetometer (VSM) showed diamagnetic and paramagnetic behavior for the nanocomposites. Analysis with Diffuse Reflectance Spectrophotometer (DRS) UV-vis showed an increase the composition of ferrite in composites increasing its ability to absorb visible light. Photocatalytic activities of ZnO/ZnFe2O4 nanocomposites on the degradation of Rhodamine B dye reached 95.6% after 3 h under natural sunlight suggesting their suitability for sunlight driven photocatalytic applications.

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Charge Carrier Scattering Mechanisms in Thermoelectric PbTe:Sb

Ukrainian Journal of Physics ◽

10.15407/ujpe59.07.0706 ◽

2014 ◽

Vol 59 (7) ◽

pp. 706-711 ◽

Cited By ~ 5

Author(s):

D.M. Freik ◽

◽

S.I. Mudryi ◽

I.V. Gorichok ◽

R.O Dzumedze ◽

...

Keyword(s):

Charge Carrier ◽

Scattering Mechanisms ◽

Carrier Scattering ◽

Charge Carrier Scattering

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Ti3C2-MXene/Bismuth Ferrite Nanohybrids for Efficient Degradation of Organic Dye and Colorless Pollutant

10.26434/chemrxiv.8192375.v1 ◽

2019 ◽

Author(s):

Ayesha Tariq ◽

M. Abdullah Iqbal ◽

S. Irfan Ali ◽

Muhammad Z. Iqbal ◽

Deji Akinwande ◽

...

Keyword(s):

Surface Area ◽

Low Cost ◽

Bismuth Ferrite ◽

Organic Dye ◽

Two Dimensional ◽

Electron Hole ◽

Photocatalytic Application ◽

Electron Hole Pair ◽

Pair Generation ◽

Photocatalytic Applications

Nanohybrids, made up of Bismuth ferrites/Carbon allotropes, are extensively used in photocatalytic applications nowadays. Our work proposes a nanohybrid system composed of Bismuth ferrite nanoparticles with two-dimensional (2D) MXene sheets namely, the BiFeO3 (BFO)/Ti3C2 (MXene) nanohybrid for enhanced photocatalytic activity. We have fabricated the BFO/MXene nanohybrid using simple and low cost double solvent solvothermal method. The SEM and TEM images show that the BFO nanoparticles were attached onto the MXene surface and in the inter-layers of two-dimensional (2D) MXene sheets. The photocatalytic application is tested for the visible light irradiation which showed the highest efficiency among all pure-BFO based photocatalysts, i.e. 100% degradation in 42 min for organic dye (Congo Red) and colorless aqueous pollutant (acetophenone) in 150 min, respectively. The present BFO-based hybrid system exhibited the large surface area of 147 m2g-1measured via Brunauer-Emmett-Teller (BET) sorption-desorption technique, and is found to be largest among BFO and its derivatives. Also, the photoluminescence (PL) spectra indicate large electron-hole pair generation. Fast and efficient degradation of organic molecules is supported by both factors; larger surface area and lower electron-hole recombination rate. The BFO/MXene nanohybrid presented here is a highly efficient photocatalyst compared to other nanostructures based on pure BiFeO3 which makes it a promising candidate for many future applications.

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The Influence of Nitrogen Position on Charge Carrier Mobility in Enantiopure Aza[6]helicene Crystals

10.26434/chemrxiv.7458719.v1 ◽

2018 ◽

Author(s):

Francesco Salerno ◽

Beth Rice ◽

Julia Schmidt ◽

Matthew J. Fuchter ◽

Jenny Nelson ◽

...

Keyword(s):

Solid State ◽

Charge Carrier ◽

Carrier Mobility ◽

Chemical Structure ◽

Crystal Packing ◽

Charge Carrier Mobility ◽

Individual Factor ◽

Charge Mobility ◽

Order Of Magnitude ◽

Small Change

The properties of an organic semiconductor are dependent on both the chemical structure of the molecule involved, and how it is arranged in the solid-state. It is challenging to extract the influence of each individual factor, as small changes in the molecular structure often dramatically change the crystal packing and hence solid-state structure. Here, we use calculations to explore the influence of the nitrogen position on the charge mobility of a chiral organic molecule when the crystal packing is kept constant. The transfer integrals for a series of enantiopure aza[6]helicene crystals sharing the same packing were analysed in order to identify the best supramolecular motifs to promote charge carrier mobility. The regioisomers considered differ only in the positioning of the nitrogen atom in the aromatic scaffold. The simulations showed that even this small change in the chemical structure has a strong effect on the charge transport in the crystal, leading to differences in charge mobility of up to one order of magnitude. Some aza[6]helicene isomers that were packed interlocked with each other showed high HOMO-HOMO integrals (up to 70 meV), whilst molecules arranged with translational symmetry generally afforded the highest LUMO-LUMO integrals (40 - 70 meV). As many of the results are not intuitively obvious, a computational approach provides additional insight into the design of new semiconducting organic materials.

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Lead-Free Metal Halide Perovskite Nanocrystals for Photocatalysis in Water

10.26434/chemrxiv.9794270 ◽

2019 ◽

Author(s):

Subhajit Bhattacharjee ◽

Sonu Pratap Chaudhary ◽

Sayan Bhattacharyya

Keyword(s):

Charge Carrier ◽

Wide Spectrum ◽

Real Life ◽

Metal Halide ◽

Lead Free ◽

Water Medium ◽

Type I ◽

Type Ii ◽

Perovskite Layer ◽

Halide Perovskites

Metal halide perovskites with high absorption coefficient, direct generation of free charge carriers, excellent ambipolar charge carrier transport properties, point-defect tolerance, compositional versatility and solution processability are potentially transforming the photovoltaics and optoelectronics industries. However their limited ambient stability, particularly those of iodide perovskites, obscures their use as photocatalysts especially in aqueous medium. In an unprecedented approach we have exploited the photo-absorption property of the less toxic lead-free Cs3Bi2X9 (X = Br, I) nanocrystals (NCs) to catalyse the degradation of water pollutant organic dye, methylene blue (MB) in presence of visible light at room temperature. After providing a proof-of-concept with bromide perovskites in isopropanol, the perovskites are employed as photocatalysts in water medium by designing perovskite/Ag2S and perovskite/TiO2 composite systems, with Type I (or quasi Type II) and Type II alignments, respectively. Ag2S and TiO2 coatings decelerate penetration of water into the perovskite layer while facilitating charge carrier extraction. With a minimal NC loading, Cs3Bi2I9/Ag2S degrades ~90% MB within an hour. Our approach has the potential to unravel the photocatalytic properties of metal halide perovskites for a wide spectrum of real-life applications.

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