scholarly journals Synthesis, Optical, Magnetic and Thermodynamic Properties of Rocksalt Li1.3Nb0.3Mn0.4O2 Cathode Material for Li-Ion Batteries

Crystals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 825
Author(s):  
Mohamed Kamel ◽  
Abanoub R. N. Hanna ◽  
Cornelius Krellner ◽  
Rüdiger Klingeler ◽  
Mohamed Abdellah ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Thermodynamic Properties ◽  
Electrochemical Properties ◽  
Transient Absorption ◽  
Lithium Ion ◽  
Transient Absorption Spectroscopy ◽  
Antiferromagnetic Order ◽  
Weiss Temperature ◽  
Charge Carrier Dynamics ◽  
Heat Capacity Measurements

Since the discovery of the reversible intercalation of lithium-ion materials associated with promising electrochemical properties, lithium-containing materials have attracted attention in the research and development of effective cathode materials for lithium-ion batteries. Despite various studies on synthesis, and electrochemical properties of lithium-based materials, fairly little fundamental optical and thermodynamic studies are available in the literature. Here, we report on the structure, optical, magnetic, and thermodynamic properties of Li-excess disordered rocksalt, Li1.3Nb0.3Mn0.4O2 (LNMO) which was comprehensively studied using powder X-ray diffraction, transient absorption spectroscopy, magnetic susceptibility, and low-temperature heat capacity measurements. Charge carrier dynamics and electron–phonon coupling in LNMO were studied using ultra-fast laser spectroscopy. Magnetic susceptibility and specific heat data are consistent with the onset of long-range antiferromagnetic order at the Néel temperatures of 6.5 (1.5) K. The effective magnetic moment of LNMO is found to be 3.60 μB. The temperature dependence of the inverse magnetic susceptibility follows the Curie–Weiss law in the high-temperature region and shows negative values of the Weiss temperature 52 K (3), confirming the strong AFM interactions.

scholarly journals Ultrafast Hyperspectral Transient Absorption Spectroscopy: Application to Single Layer Graphene

Photonics ◽  
2019 ◽  
Vol 6 (3) ◽  
pp. 95 ◽  
Author(s):  
Felice Gesuele
Keyword(s):  
Spectral Range ◽  
Transient Absorption ◽  
Pump Energy ◽  
Single Layer ◽  
Transient Absorption Spectroscopy ◽  
Single Layer Graphene ◽  
Data Set ◽  
Layer Graphene ◽  
Charge Carrier Dynamics ◽  
2D Data

We describe the basic principles and the experimental implementation of the hyperspectral transient absorption technique, based on femtosecond laser sources. In this technique the samples were optically “pumped” using the femtosecond tunable pulse delivered by an Optical Parametric Amplifier, and “probed” for changes in transmission in a broad spectral range with a “white light” laser-generated supercontinuum. The spectra were collected by a pair of multichannel detectors which allowed retrieval of the absorbance change in a wide spectral range in one time. The use of the supercontinuum probe introduced artifacts in the measured 2D data set which could be corrected with a proper calibration of the chirp. The configuration with crossed polarization for pump and probe pulse extended the spectral measured range above and below the pump energy within the same experiment. We showed the versatility of the technique by applying it to the investigation of the charge carrier dynamics in two-dimensional single layer graphene.

scholarly journals Ultrafast photoinduced dynamics of the organolead trihalide perovskite CH3NH3PbI3 on mesoporous TiO2 scaffolds in the 320–920 nm range

2015 ◽  
Vol 17 (29) ◽  
pp. 19238-19246 ◽  
Author(s):  
Oliver Flender ◽  
Johannes R. Klein ◽  
Thomas Lenzer ◽  
Kawon Oum
Keyword(s):  
Charge Carrier ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Carrier Dynamics ◽  
Mesoporous Tio2 ◽  
Transient Absorption Spectroscopy ◽  
Charge Carrier Dynamics ◽  
Nm Range

Ultrafast broadband transient absorption spectroscopy elucidates charge carrier dynamics in the perovskite CH3NH3PbI3.

scholarly journals Charge Carrier Dynamics of Photoexcited Co3O4 in Methanol: Extending High Harmonic Transient Absorption Spectroscopy to Liquid Environments

Nano Letters ◽  
2014 ◽  
Vol 14 (10) ◽  
pp. 5883-5890 ◽  
Author(s):  
L. Robert Baker ◽  
Chang-Ming Jiang ◽  
Stephen T. Kelly ◽  
J. Matthew Lucas ◽  
Josh Vura-Weis ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
High Harmonic ◽  
Carrier Dynamics ◽  
Transient Absorption Spectroscopy ◽  
Charge Carrier Dynamics

scholarly journals In situ charge carrier dynamics of semiconductor nanostructures for advanced photoelectrochemical and photocatalytic applications

Nanophotonics ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 777-795
Author(s):  
Ting-Hsuan Lai ◽  
Ken-ichi Katsumata ◽  
Yung-Jung Hsu
Keyword(s):  
Transient Absorption ◽  
Semiconductor Nanostructures ◽  
Operating Conditions ◽  
Transient Absorption Spectroscopy ◽  
Spectroscopic Techniques ◽  
Charge Dynamics ◽  
Charge Carrier Dynamics ◽  
Solar Energy Harvesting ◽  
Recent Developments

AbstractUsing in situ ultrafast laser spectroscopic techniques to monitor the charge dynamics of semiconductor photocatalysts under operating conditions is essential for digging out the veritable interactions between charge carriers and the reactive species. This real-time observation is desirable for optimizing individual components and their integration in advanced photoelectrochemical (PEC) and photocatalytic systems, which can achieve the “Holy Grail” of solar energy harvesting and solar fuel generation. This Review summarizes the recent developments of employing transient absorption spectroscopy for in situ measurements of charge dynamics on semiconductor nanostructures. The implications in the PEC and photocatalytic reactions toward hydrogen production and carbon dioxide reduction will be discussed, along with future outlooks and perspectives.

scholarly journals Time-resolved terahertz spectroscopy reveals the influence of charged sensitizing quantum dots on the electron dynamics in ZnO

2017 ◽  
Vol 19 (8) ◽  
pp. 6006-6012 ◽  
Author(s):  
Sesha Bamini N. ◽  
Hynek Němec ◽  
Karel Žídek ◽  
Mohamed Abdellah ◽  
Mohammed J. Al-Marri ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Charge Carrier ◽  
Transient Absorption ◽  
Terahertz Spectroscopy ◽  
Carrier Dynamics ◽  
Transient Absorption Spectroscopy ◽  
Cdse Quantum Dots ◽  
Electron Dynamics ◽  
Time Resolved ◽  
Charge Carrier Dynamics

Photoinitiated charge carrier dynamics in ZnO nanoparticles sensitized by CdSe quantum dots is studied using transient absorption spectroscopy and time-resolved terahertz spectroscopy.

scholarly journals Origin of the overall water splitting activity of Ta3N5 revealed by ultrafast transient absorption spectroscopy

2019 ◽  
Vol 10 (20) ◽  
pp. 5353-5362 ◽  
Author(s):  
Dharmapura H. K. Murthy ◽  
Hiroyuki Matsuzaki ◽  
Zheng Wang ◽  
Yohichi Suzuki ◽  
Takashi Hisatomi ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Water Splitting ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Carrier Dynamics ◽  
Transient Absorption Spectroscopy ◽  
Spectroscopy Study ◽  
Overall Water Splitting ◽  
Charge Carrier Dynamics ◽  
Ultrafast Transient Absorption

A detailed transient absorption spectroscopy study efficiently correlates charge carrier dynamics with the overall water splitting efficiency in Ta3N5 photocatalyst.

scholarly journals Charge carrier dynamics of methylammonium lead iodide: from PbI2-rich to low-dimensional broadly emitting perovskites

2016 ◽  
Vol 18 (16) ◽  
pp. 10800-10808 ◽  
Author(s):  
Johannes R. Klein ◽  
Oliver Flender ◽  
Mirko Scholz ◽  
Kawon Oum ◽  
Thomas Lenzer
Keyword(s):  
Charge Carrier ◽  
Transient Absorption ◽  
Carrier Dynamics ◽  
Transient Absorption Spectroscopy ◽  
Lead Iodide ◽  
Charge Carrier Dynamics ◽  
Carrier Recombination ◽  
Recombination Rate Constant ◽  
Low Dimensional ◽  
Methylammonium Lead Iodide

Broadband transient absorption spectroscopy reveals an increased carrier recombination rate constant of low-dimensional perovskites.

scholarly journals Charge carrier dynamics and photocatalytic behavior of TiO2 nanopowders submitted to hydrothermal or conventional heat treatment

RSC Advances ◽  
2015 ◽  
Vol 5 (86) ◽  
pp. 70536-70545 ◽  
Author(s):  
A. O. T. Patrocinio ◽  
J. Schneider ◽  
M. D. França ◽  
L. M. Santos ◽  
B. P. Caixeta ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Photocatalytic Activity ◽  
Transient Absorption ◽  
Carrier Dynamics ◽  
Transient Absorption Spectroscopy ◽  
Electron Hole ◽  
Charge Carrier Dynamics ◽  
Conventional Heat Treatment ◽  
Tio2 Nanopowders

The role of thermal treatment on the electron/hole dynamics and on the photocatalytic activity of TiO2 is investigated by transient absorption spectroscopy.

Transient Absorption Studies on Nanostructured Materials and Composites: Towards the Development of New Photocatalytic Systems

2018 ◽  
Vol 232 (9-11) ◽  
pp. 1469-1493 ◽  
Author(s):  
Christoph Haisch ◽  
Barbara N. Nunes ◽  
Jenny Schneider ◽  
Detlef Bahnemann ◽  
Antonio Otavio T. Patrocinio
Keyword(s):  
Transient Absorption ◽  
Review Paper ◽  
High Photocatalytic Activity ◽  
Carrier Dynamics ◽  
Transient Absorption Spectroscopy ◽  
Sustainable Technologies ◽  
Charge Carrier Dynamics ◽  
Absorption Studies ◽  
Time Regime ◽  
Photocatalytic Processes

AbstractBeing part of the development of environmentally clean and safe sustainable technologies photocatalysis is attracting increasing attention. During the last decade, great attention has been paid to the synthesis of different photocatalysts possessing high photocatalytic activity, whereas fundamental studies concerning the underlying photocatalytic processes have rarely been executed. The knowledge of these processes is, however, of utmost importance for the understanding of the reaction mechanism and thus for a better design of photocatalytic systems. The transient absorption spectroscopy (TAS) is one widely used method to study such fundamental processes. The present review paper focuses on the application of TAS in the UV-Vis-IR regions to investigate the charge carrier dynamics in ultrafast and nano-to-millisecond time regime. Hereby, the photo induced processes occurring in different materials will be discussed. Moreover, further attention is also paid to nanocomposite-based systems, in which different materials are used concomitantly to promote more efficient photocatalytic processes.

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