scholarly journals Influence of the Physical Properties on the Antibacterial and Photocatalytic Behavior of Ag-Doped Indium Sulfide Film Deposited by Spray Pyrolysis

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 370
Author(s):  
Belgacem Tiss ◽  
Youssef Moualhi ◽  
Noureddine Bouguila ◽  
Mabrouk Kraini ◽  
Sahbi Alaya ◽  
...  
Keyword(s):  
Spray Pyrolysis ◽  
Photocatalytic Performance ◽  
Small Polaron ◽  
Charge Carrier Concentration ◽  
Indium Sulfide ◽  
Biological Applications ◽  
Silver Doping ◽  
Polaron Hopping ◽  
Photodegradation Efficiency ◽  
Sulfide Film

Spray pyrolysis was used to deposit indium sulfide (In2S3) films, with or without silver doping. The films are polycrystalline, and the inclusion of Ag in the In2S3 structure leads to the formation of a solid solution, with the crystallite size of the order of tens of nanometers. In2S3 films exhibit a semiconductive behavior, and the incorporation of Ag leads to an increase of the charge carrier concentration, enhancing the electrical conductivity of the films. The small polaron hopping mechanism, deduced by the fittings according to the double Jonscher variation, explains the evolution of the direct current (dc) conductivity at high temperature of the Ag-doped indium sulfide. From impedance spectroscopy, it was found that the doped film presents dielectric relaxation, and Nyquist diagrams indicate the importance of the grain and the grain boundaries’ contributions to the transport phenomena. The physical characteristics of the films have an influence on the photocatalytic performance, achieving photodegradation efficiency above 80% (85.5% in the case of Ag doping), and on the antibacterial activity. The obtained results indicate that indium sulfide films are good candidates for environmental and biological applications, confirming a multifunctional nature.

Small polaron hopping conduction mechanism in Fe doped LaMnO3

2011 ◽  
Vol 135 (5) ◽  
pp. 054501 ◽  
Author(s):  
Wasi Khan ◽  
Alim H. Naqvi ◽  
Maneesha Gupta ◽  
Shahid Husain ◽  
Ravi Kumar
Keyword(s):  
Conduction Mechanism ◽  
Small Polaron ◽  
Hopping Conduction ◽  
Polaron Hopping ◽  
Small Polaron Hopping

Synthesis and Electrical Transport Property of Sr and Cu-Doped LaFeO3-Based Cathode Material for IT-SOFC

2013 ◽  
Vol 710 ◽  
pp. 33-36
Author(s):  
Jie Zhao ◽  
Jiang Fu ◽  
Yong Fu ◽  
Yong Chang Ma
Keyword(s):  
Cathode Material ◽  
Electrical Transport ◽  
High Performance ◽  
Small Polaron ◽  
Negative Temperature ◽  
Rare Earth Oxide ◽  
Intermediate Temperature ◽  
Charge Balance ◽  
Mixed Conductivity ◽  
Polaron Hopping

In order to accelerate the commercialization of SOFCs technology, the key is the development of high performance cathode materials operated at intermediate temperature. Sr and Cu doped rare earth oxide La1-xSrxFe1-yCu.yO3-δ (x=0.1, 0.3 ; y=0.1, 0.2, denoted as LSFCu-11, LSFCu-31 and LSFCu-32 ) were synthesized by solid state reaction method (SSR). The formation process, phase structure and microstructure of the synthesized samples were characterized using TG/DSC, XRD and SEM. The thermal expansion coefficients (TEC) of the samples were analyzed by thermal dilatometry. The electrical conductivities of the samples were measured with DC four-terminal method from 25 to 950 °C. The results indicate that the samples exhibit a single phase with orthorhombic and hexagonal perovskite structure after sintered at 1200 °C for 4h. The electrical conductivity of the samples increases with temperature up to a maximum value, and then decreases gradually. The small polaron hopping is regarded as the conducting mechanism for synthesized samples at T 550 °C. The negative temperature dependence occurring at higher temperature is due to the creation of oxygen vacancies for charge balance. LSFCu-32 has higher mixed conductivity (> 100 S·cm-1) at intermediate temperature and can meet the demand of cathode material for IT-SOFC. In addition, the average TECs of LSFCu-11, LSFCu-31 and LSFCu-32 are 1.22 × 10-6 K-1 , 1.30 × 10-6 K-1 and 1.34 × 10-6 K-1 respectively.

Adiabatic small polaron hopping in K 2 O–WO 3 –Nb 2 O 5 –P 2 O 5 glasses

2014 ◽  
Vol 255 ◽  
pp. 56-59 ◽  
Author(s):  
Isaias Oliva ◽  
Atsunobu Masuno ◽  
Hiroyuki Inoue ◽  
Motohiro Sakamoto ◽  
Kazuki Morita
Keyword(s):  
Small Polaron ◽  
Polaron Hopping ◽  
Small Polaron Hopping ◽  
Adiabatic Small Polaron

Enhanced Magnetic and DC Electrical Properties of Sm-Doped Bi2Fe4O9 Nanoplates Synthesized by Sol–Gel Method

NANO ◽  
2020 ◽  
Vol 15 (02) ◽  
pp. 2050020 ◽  
Author(s):  
E. M. M. Ibrahim ◽  
G. Farghal ◽  
Mai M. Khalaf ◽  
Hany M. Abd El-Lateef
Keyword(s):  
Magnetic Measurements ◽  
Small Polaron ◽  
Sol Gel ◽  
Electric Transport ◽  
X Ray Diffraction ◽  
Polaron Hopping ◽  
Gel Method ◽  
Sol Gel Method ◽  
High Temperature Measurement ◽  
Ferromagnetic Ordering

In this work, Bi[Formula: see text]SmxFe4O9 ([Formula: see text], 0.02, 0.06, 0.08, 0.1) nanoplates with an average thickness of 62–125[Formula: see text]nm were synthesized using a sol–gel method. The samples were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy. The magnetic measurements show that the nanoplates have weak ferromagnetic ordering. The saturation magnetization of the nanoplates increases as the Sm content increases. The DC electric transport properties were studied by measuring the temperature dependence of the resistivity in the temperature range 300–680[Formula: see text]K. The materials show typical semiconductor features, and the conduction mechanisms are governed by electron and small polaron hopping in the low and high temperature measurement ranges, respectively. The Sm doping results in a significant enhancement in the electrical conductivity of the Bi2Fe4O9 nanoplates.

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