Photoluminescence emission behavior on the reduced band gap of Fe doping in CeO2-SiO2 nanocomposite and photophysical properties

Farrukh, Muhammad Akhyar; Butt, Komal Mehmood; Chong, Kok‐Keong; Chang, Wen-Kuei

doi:10.1016/j.jscs.2018.10.002

Cited by 79 publications

(39 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The excited electrons decayed to surface‐states (non‐radiatively) and then to valence band (radiatively), thereby emitting photons of lower energy. These lower energy photons correspond to

h ν

∼2.65 eV (468 nm), which is blue light in the visible region [38, 39], Figure 10.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterisation of cerium sulphide over optical fiber and its gas sensing application

Theoderaj

Jacob

Chitra

2021

Materialwissenschaft Werkst

View full text Add to dashboard Cite

In this study, a cladding‐modified optical fiber‐based gas sensor is proposed for detection of carbon dioxide gas. Cerium disulphide (CeS2) is synthesised and coated by chemical bath deposition (CBD) route over the region in which cladding is removed. This synthesised cerium disulphide is characterised by x‐ray diffraction (XRD), photoluminescence spectrum (PL), ultra violet‐visible absorption spectrum, ultra violet ‐visible reflectance and transmittance spectrum, scanning electron microscope images (SEM) and energy dispersive x‐ray spectrum (EDX). The response of the sensor is recorded for different concentrations of test gases (nitrogen dioxide and carbon dioxide) and the sensor's selectivity is compared and analysed. It is observed that cerium disulphide is more sensitive to carbon dioxide compared to nitrogen dioxide.

show abstract

“…The excited electrons decayed to surface‐states (non‐radiatively) and then to valence band (radiatively), thereby emitting photons of lower energy. These lower energy photons correspond to

h ν

∼2.65 eV (468 nm), which is blue light in the visible region [38, 39], Figure 10.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterisation of cerium sulphide over optical fiber and its gas sensing application

Theoderaj

Jacob

Chitra

2021

Materialwissenschaft Werkst

View full text Add to dashboard Cite

show abstract

“…here, C ij and d ij are specific constants having values 0.49 and 1.26 Å, [47] and k represents the force constant in Mdynes cm À1 . k relates to the rigidity of the bond and can be found using Hook's law basic harmonic equation which can be rearranged to give Equation ( 5).…”

Section: Calculation Of Bond Lengthsmentioning

confidence: 99%

“…Kinetic and thermodynamic parameters like half-life, rate constants, activation energy, spontaneity, enthalpy change, and Gibbs-free energy were calculated for every phase of each sample by using TGA data. To calculate the rate constant and half-life, all reactions were considered to be first-order reactions and subsequently, Equation (7) [47] was used for the first-order reaction.…”

Section: Calculation Of Kinetic and Thermodynamic Parametersmentioning

confidence: 99%

Neodymium oxide nanoparticles synthesis using phytochemicals of leaf extracts of different plants as reducing and capping agents: Growth mechanism, optical, structural and catalytic properties

Ahmed

Rizvi

Shahzad

et al. 2022

J Chinese Chemical Soc

Self Cite

View full text Add to dashboard Cite

The main idea of this research is to synthesize the neodymium oxide (Nd2O3) nanoparticles with a particle size of less than 10 nm and to investigate the influence of leaf extracts of different plants. Leaf extracts of three plants namely Phyllanthus emblica, Citrus limetta, and Citrus paradisi, were used for the fabrication of Nd2O3 via the sol–gel and green synthesis methods, and the mechanism for the synthesis of neodymium oxide has been investigated. All prepared samples were subjected to UV–Visible Spectroscopy, Fourier Transform Infrared spectroscopy (FTIR), Thermogravimetric analysis (TGA), X‐ray diffraction (XRD) analysis, and Scanning Electron Microscopy (SEM) and Energy Dispersive X‐ray (EDX) analysis to study the optical and structural properties. The band gap of the neodymium oxide nanoparticles was observed between 4.45 and 5.26 eV. The bond length of Nd‐O for the neodymium oxide samples as‐synthesized was calculated as 2.18 and 2.24 Å by using FTIR data. Furthermore, kinetic and thermodynamic parameters were calculated using TGA. XRD patterns showed the formation of cubic, monoclinic, and hexagonal structures of Nd2O3. The Nd2O3 nanoparticles were used as photocatalysts for the degradation of methylene blue under irradiation of sunlight, and the maximum percentage degradation of 74.8% was observed.

show abstract

“…The shape and size distribution of the nanoparticles were investigated using Field emission scanning electron microscope (FESEM, model Quanta 250). The prepared samples were analyzed through TGA/DTG with heating rate of 20 o C/min in the temperature range of 25-1000 o C. In addition, the thermodynamic parameters were determined using 1st order reaction rate equation as given in the following relation [12]: where x is the fracture of sample decomposed at time t, k is rate constant of reaction, wi is the initial weight, wf is final weight and wt is weight of sample at particular time t.…”

Section: Characterization Of Ferrite Nanoparticlesmentioning

confidence: 99%

“…The Coats and Redfern model can be used to detect the kinetics parameters as designated in the following formula [12]:…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

Synthesis and Characterization of Non-Stoichiometric Li1.1Co0.3Fe2.1O4 Ferrite Nanoparticles For Humidity Applications

ElFarhatey

Ateia

Mosry³

et al. 2021

Preprint

View full text Add to dashboard Cite

Humidity sensor plays a crucial role in determining the efficiency of materials and the precision of apparatuses. To measure and control humidity, a non-stoichiometric Li1.1Co0.3Fe2.1O4 mesopores sensor is synthesized by a modified citrate auto combustion technique. The XRD study confirms that prepared nanoparticles are cubic spinel structures having Fd3m space group. The crystallite size is approximate 36 nm. Thermal analyses measurements confirm that the samples become thermally stable starting from 600 °C. Additionally, the kinetic studies of the prepared samples are calculated via a pseudo-first-order kinetic model. The temperature dependence of AC conductivity is found to increase with increasing the temperature. These observations are explained in various models. The resistivity mechanism of humidity sensors is studied via Complex impedance spectroscopy (CIS). Its impedance data is fitting to a corresponding circuit, to achieve a simulation of the sample under study. This fitting is detected by the Nyquist plot (Cole-Cole). The obtained data confirms that the studied samples are very sensitive to humidity and can be commercially used as a humidity sensing element.

show abstract

Photoluminescence emission behavior on the reduced band gap of Fe doping in CeO2-SiO2 nanocomposite and photophysical properties

Cited by 79 publications

References 51 publications

Synthesis and characterisation of cerium sulphide over optical fiber and its gas sensing application

Synthesis and characterisation of cerium sulphide over optical fiber and its gas sensing application

Neodymium oxide nanoparticles synthesis using phytochemicals of leaf extracts of different plants as reducing and capping agents: Growth mechanism, optical, structural and catalytic properties

Synthesis and Characterization of Non-Stoichiometric Li1.1Co0.3Fe2.1O4 Ferrite Nanoparticles For Humidity Applications

Contact Info

Product

Resources

About