Article
Materials Science, Multidisciplinary
A. Kadari, R. Chikhaoui, I. A. El-Mesady
Summary: In this study, magnesium borate was synthesized via sol-gel process with Mn2+ and Dy3+ dopants. X-ray diffraction and Fourier Transform Infrared were used to study the properties and absorption spectra. Particle sizes and energy band gap were calculated, showing that doping can increase the energy band gap. These results are important for increasing the utilization of magnesium borate in various industrial applications.
Article
Chemistry, Physical
Wenyong Jia, Qilin Wei, Shuaigang Ge, Chengyu Peng, Tao Huang, Shangfei Yao, Ye Tian, Tong Chang, Ruosheng Zeng, Bingsuo Zou
Summary: Mn2+-doped CsCdBr3 perovskite materials exhibit strong photoluminescence emission and high PLQY after doping, with enhanced nonlinear optical response, suggesting potential significant applications in spintronic or optoelectronic devices.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Parul Sharma, Pankaj Biswas, Prabhakar Singh, Kamni
Summary: A simplistic method was used to synthesize NaSr(1-x)VO4:xMn(2+) nanophosphors with 0.25 <= x <= 3.0 mol% through combustion synthesis route, using urea as an organic fuel. The structural, spectral, and optical properties were examined, revealing the mid gap absorption phenomenon when doping the host with Mn2+ ions. Photoluminescence analysis showed two prominent emissions at 434 nm and 523 nm under excitation at 380 nm, indicating the potential of this phosphor material to be excited by UVA emitting InGaN LEDs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Kartika Maheshwari, A. S. Rao
Summary: Tb3+ doped BZLP glasses were prepared and extensively investigated for their potential use in visible photonic device applications. Spectroscopic techniques including XRD, UV-VIS absorption, and photoluminescence (PL) were employed to study the glass properties. The resulting glasses exhibited intense green emission and relatively weak emission in blue, yellow, and red regions. The PL intensity increased with the concentration of Tb3+ ions. The glasses showed a high thermal stability and suitability as a green emitter for visible photonic devices.
Article
Engineering, Electrical & Electronic
A. Sedky, N. Afify, Abdullah Almohammedi, E. M. M. Ibrahim, Atif Mossad Ali
Summary: We investigated the structural, optical, photoluminescence (PL), and magnetic properties of Zn1-x-yFexMyO nanoparticles. The lattice constants and crystallite size decreased with increasing Fe content, and further decreased up to (Fe + M) = 0.30. Fe doping led to a compressive stress and the particle size ranged from 180 to 277 nm in the order of ZnO, (Fe + Cu), (Fe + Ni), and Fe samples. While pure and Fe-doped ZnO had a single energy gap (E-g), co-doped samples exhibited two energy gaps (E-gh and E-gl). Fe generally increased E-g, followed by a further increase in the Cu-series and a decrease in the Ni-series. Refractive indices n(K) and n(T) decreased with Fe, with a further decrease in both series. Although Fe doping reduced the carrier density (N/m*), it increased again in the co-doped samples. Fe decreased the residual dielectric constant epsilon(L), followed by an increase in the Cu-series but a decrease in the Ni-series. The loss factor tan delta slightly increased with Fe, followed by an increase in the Ni-series and a decrease in the Cu-series. Fe significantly depressed the optical conductivity sigma(opt), followed by a further decrease, particularly in the Cu-series. PL measurements showed four visible emissions, and an infrared emission at around 825 nm was only observed in the co-doped samples. The blue emission (I-blue) was higher than the ultraviolet emission (I-UV), [(I-blue/I-UV) > 1], and the Ni series had a greater blue emission than the Cu series. ZnO exhibited diamagnetic behavior, while Fe and co-doped samples exhibited ferromagnetic behavior, with higher magnetization in the Ni-series than the Cu. Overall, the results suggest that co-doped samples at the nanoscale have potential applications in advanced devices.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Monika Duhan, Shashank Bharadwaj, Anita Gupta, Harminder Kaur
Summary: This study reports the defect induced room temperature ferromagnetism (RTFM) in (La, Gd) codoped SnO2 nanostructures prepared by sol-gel method. The observed RTFM is mainly attributed to the presence of oxygen vacancies, which is supported by Photoluminescence (PL) measurements showing emissions associated with vacancies/defects.
Article
Engineering, Electrical & Electronic
A. Ayana, Neelamma B. Gummagol, Parutagouda Shankaragouda Patil, Pankaj Sharma, B. V. Rajendra
Summary: The Zn1-xLaxO nanofilms were prepared using chemical spray pyrolysis technique at 723K, with La3+ ion doping resulting in the smallest crystalline size and highest dislocation density. Changes in surface morphology were observed with increased dopant concentration. Different properties such as absorption edge shifts and optical coefficients were affected by the La3+ incorporation in the deposits.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Chemistry, Physical
Sapan Kumar Sen, Supria Dutta, Lincoln Paik, Tapash Chandra Paul, M. S. Manir, Mongur Hossain, M. N. Hossain
Summary: This experimental work investigated undoped and Dy-doped MoO3 nanobelts with different doping concentrations synthesized via hydrothermal route. The influence of Dy dopant contents on structural, morphological, elemental, functional, and optical properties of MoO3 nanobelts was studied. The results showed that Dy doping affects the microstructural, morphological, and optical characteristics of MoO3 nanobelts, while having minimal impact on morphology.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
B. Sawicki, E. Tomaszewicz, M. Guzik, T. Gron, M. Oboz, H. Duda, S. Pawlus, P. Urbanowicz
Summary: Ca1-3x-yMny[]xNd2x(MoO4) (1-3x)(WO4) (3x) molybdato-tungstates ([] denotes vacant sites) were synthesized successfully by high-temperature solid-state reaction and exhibited scheelite-type structure within the entire solid solution homogeneity range (x < 0.2000 and y = 0.0200). The morphology and particle size distribution of the materials were studied using SEM and laser diffraction methods. Spectroscopic measurements in the UV-vis range were conducted to determine optical properties, and the magnetic behavior was found to be paramagnetic with long-range ferrimagnetic and short-range antiferromagnetic interactions. The electrical conductivity and thermoelectric power factor of the new materials were strongly influenced by the Nd3+ ion content.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Rajesh Kumar, Jitender Kumar, Ramesh Kumar, Akshay Kumar, Aditya Sharma, S. O. Won, K. H. Chae, Mukhtiyar Singh, Ankush Vij
Summary: In this study, we report the photoluminescence properties of Eu3+ doped HfO2 nanoparticles prepared using co-precipitation method. The results showed that Eu3+ doping can change the phase structure of HfO2 and achieve high color purity red emission spectra, which are suitable for solid state lighting applications.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Materials Science, Ceramics
G. Padmasree, P. Yadagiri Reddy, Ch. Gopal Reddy
Summary: This paper presents investigations on the effect of Dysprosium (Dy) on the structural and electrical properties of polycrystalline Yttrium Iron Oxide (YFeO3). Samples with different Dy concentrations were prepared through the sol-gel process. The results show that the lattice parameter values increase with an increase in Dy concentration, indicating changes in the crystal structure. The morphology of the samples observed through SEM reveals irregular and non-homogeneous grain sizes. The electrical properties analysis suggests an increase in leakage current density up to a certain concentration of Dy, followed by a decrease.
CERAMICS INTERNATIONAL
(2022)
Article
Biochemistry & Molecular Biology
Hubert Fuks, Pawel Kochmanski, Elzbieta Tomaszewicz
Summary: New Gd3+- and Mn2+-co-doped calcium molybdato-tungstates were successfully synthesized using high-temperature solid-state reaction method and combustion route. The obtained ceramic materials have scheelite-type structure and show significant antiferromagnetic interactions. Spectroscopic and SEM studies were conducted to analyze the properties and morphology of the powders.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Materials Science, Multidisciplinary
S. Kurtaran, M. Kellegoz, S. Kose
Summary: CeO2 thin films doped with Gd through spray pyrolysis technique exhibit enhanced optical, structural, and electrical properties, showing high transmittance and promising photoluminescence characteristics. These films may be considered as potential materials for optoelectronic applications.
Article
Chemistry, Physical
Madhavi Jonnalagadda, Vishnu Bhotla Prasad, Anjanapura Raghu
Summary: The fabrication of composite nanopowders with tailored properties has attracted significant attention in various fields. The study focuses on transition metal ions doped ZnS-CdS composite nanopowders, analyzing their preparation, structural and spectral characterizations. The results show unique morphological features and covalent bonding between doped ions and ligands, with emission bands in UV, blue, and green regions.
JOURNAL OF MOLECULAR STRUCTURE
(2021)
Article
Materials Science, Ceramics
Nanchuan Wang, Shibo Guo, Qiaochu Chen, Fengmei Gao, Weiyou Yang, Hui Fu, Jinju Zheng
Summary: The study synthesized a series of Mn2+-doped CsPbCl3 samples with different OAm-Cl contents, finding that the Mn2+ concentration was fixed at 0.65% in the samples and the Mn2+ photoluminescence exhibited an OAm-Cl content-independent lifetime. The excitonic and Mn2+ PL intensities of the NCs were strongly related to the amount of OAm-Cl, with different trends depending on the OAm-Cl content.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Crystallography
Rajesh Raman, Giridharan Nambi Venkatesan, P. Sakthivel, I. B. Shameem Banu
Summary: The structural arrangement of cobalt-doped BiFeO3 is studied to improve its electrical, magnetic, and thermal properties for practical applications. The dielectric behavior of Bi0.9Co0.1FeO3 shows a significant anomaly corresponding to magnetoelectric coupling. Additionally, the maximum magnetization of Bi0.9Co0.1FeO3 is two orders of magnitude higher compared to pure BiFeO3.
Review
Chemistry, Analytical
Durga Prasad Pabba, Mani Satthiyaraju, Ananthakumar Ramasdoss, Pandurengan Sakthivel, Natarajan Chidhambaram, Shanmugasundar Dhanabalan, Carolina Venegas Abarzua, Mauricio J. Morel, Rednam Udayabhaskar, Ramalinga Viswanathan Mangalaraja, Radhamanohar Aepuru, Sathish-Kumar Kamaraj, Praveen Kumar Murugesan, Arun Thirumurugan
Summary: This article presents the superior advantages of 2D MXenes for nanogenerators and reviews the recent progress in this field. The topics covered include the applications of MXenes in nanogenerators, renewable energy, classifications and working principles of nanogenerators, materials for energy harvesting, and combinations of MXene with other active materials. Furthermore, the synthesis and properties of MXene, MXene nanocomposites with polymeric materials, and internal improvement mechanisms of MXenes for nanogenerators using 3D printing technologies are discussed in detail. Finally, the key points of this review are summarized, and some thoughts on potential approaches for better performance of nanogenerators using MXene-based nanocomposite materials are presented.
Review
Chemistry, Physical
Natarajan Chidhambaram, Samuel Jasmine Jecintha Kay, Saravanan Priyadharshini, Rajakantham Meenakshi, Pandurengan Sakthivel, Shanmugasundar Dhanbalan, Shajahan Shanavas, Sathish-Kumar Kamaraj, Arun Thirumurugan
Summary: The conversion of diverse non-petroleum carbon elements into cleaner hydrocarbon fuels and useful chemicals heavily relies on syngas. New catalysts with enhanced activity and adjustable product selectivity are needed for syngas-based technologies. Magnetic nanomaterials have shown promise as catalysts due to their magnetic properties and their ability to be easily separated using a magnetic separation process.
Article
Chemistry, Physical
H. Sirajunisha, T. Balakrishnan, P. Sakthivel, A. Krishnaveni
Summary: In this study, pure Hydroxyapatite (HAp), Titanium-Hydroxyapatite (Ti-HAp), reduced Graphene oxide-Hydroxyapatite (rGO-HAp), and Titanium-reduced Graphene Oxide-Hydroxyapatite (Ti-rGO-HAp) nanocomposites were successfully synthesized using sol-gel technique. The impact of the incorporation of Ti and rGO on properties of the HAp nanopowders, including structural, optical, morphological, corrosion, antibacterial, and biocompatibility, was investigated. The results showed that the Ti-rGO-HAp nanocomposites demonstrated more toxic antibacterial activity and improved biocompatibility, making them potential candidates for biomedical applications.
CHEMICAL PHYSICS IMPACT
(2023)
Article
Chemistry, Physical
A. Sridhar, P. Sakthivel, K. Saravanakumar, R. K. Sankaranarayanan
Summary: ZnO nanoparticles with Ag+ and Al3+ ions doping were synthesized using microwave-assisted chemical synthesis. The Al doping ratio affected the crystallite size and optical band gap, resulting in a blue shift in the band gap. The synthesized nanoparticles showed high photocatalytic activity and no leaching of catalyst into the reaction medium.
APPLIED SURFACE SCIENCE ADVANCES
(2023)
Article
Chemistry, Inorganic & Nuclear
A. Muthukrishnaraj, J. Manokaran, S. S. Kalaivani, P. Sakthivel, P. Muthukrishnan, N. Balasubramanian, Ayyar Manikandan, Anish Khan, Abdullah M. Asiri
Summary: Reported is a greener synthesis method for defect-free graphene by electrochemical exfoliation of graphite in methyl sulfonic acid (MSA), which has vast potential applications in electronics and optoelectronics. The nature of the defects in the synthesized graphene was analyzed by Raman spectroscopy, revealing that Electrochemical graphene (EGp) has fewer defects compared to chemical graphene (CGp).
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
S. Jasmine Jecintha Kay, N. Chidhambaram, Arun Thirumurugan, Shajahan Shanavas, P. Sakthivel, R. S. Rimal Isaac
Summary: This study compares the physicochemical characteristics of perovskite bismuth ferrite nanoparticles synthesized using chemical coprecipitation and biogenic methods. The results show that the biogenic sample does not require non-stoichiometric compensation, unlike the chemical sample. Additionally, the biogenic sample has a smaller bandgap and stronger bonds, and exhibits weak ferromagnetism under an applied magnetic field.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Physical
P. Sakthivel, Pragati Kumar, M. Dhavamurthy, Arun Thirumurugan, S. Sridhar
Summary: The Mn, La dual doped ZnS QDs were synthesized using co-precipitation method. The XRD analysis confirmed the cubic phase and HR-TEM estimated the average crystallite size of 2 nm. FT-IR spectroscopy and EDAX ensured the purity of the samples. Surface morphological examination revealed the surface structure and particle aggregation of the sample. UV-visible spectroscopy showed that La 2% doped Mn: ZnS had a large band gap of 3.98 eV. The size dependence of the Zn0.98-xMn0.02LaxS QDs was confirmed by the shift of absorption and emission peaks. Increased La concentration led to higher optical absorbance. Defect-induced red emission was observed through PL study. Cyclic Voltagram (CV) findings demonstrated enhanced electrical properties of ZnS electrolytes through codoping with an ideal ratio of La3+ and Mn2+ ions.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Materials Science, Multidisciplinary
S. Murugan, M. Ashokkumar, P. Sakthivel
Summary: Pure ZnS and MgS quantum dots were synthesized by co-precipitation method, and ZnS:MgS nanocomposites were prepared in different ratios. The nanocomposites were characterized for their structural, morphological, compositional, and optical properties. The ZnS:MgS nanocomposites exhibited enhanced absorption and a narrowed band gap with increasing MgS concentration. ZnS:MgS (4:1) showed excellent photocatalytic activity for the reduction of methylene blue dye. The reusability of the nanocomposites and the antioxidant activity were also evaluated.
Article
Crystallography
Shanmugam Karuppusamy, Veerappampalayam Easwaramoorthy Sathishkumar, Kanagaraj Dinesh Babu, Pandurengan Sakthivel
Summary: This article discusses the preparation and properties of organic 2-chloro-5 nitroaniline (2C5NA) crystals. The authors optimized the ampoule shape, dimensions, cone angle, and temperature profile to produce high-quality bulk crystals using the vertical Bridgman approach. Various analysis techniques were used to confirm the crystal structure, molecular structure, and presence of functional groups. The article also examines the thermal stability, kinetic parameters, electrical conductivity, and dielectric behavior of the 2C5NA crystal.
Article
Multidisciplinary Sciences
S. Karuppusamy, S. Muralidharan, K. Dinesh Babu, P. Sakthivel, Dongjin Choi
Summary: The 2-amino 4-methylpyridinium 4-nitrophenolate 4-nitrophenol (2A4MPPP) crystal was prepared and its thermal, mechanical, dielectric, and kinetic properties were investigated. The crystal exhibited good thermal stability, making it suitable for applications in thermomechanical, microelectronic, optical communications, and nonlinear optical fields.
Article
Multidisciplinary Sciences
S. Murugan, M. Ashokkumar, P. Sakthivel, Dongjin Choi
Summary: The photocatalyst with antimicrobial activity is a suitable material for treating wastewater that contains microbes, hazardous dyes, and heavy metals. This study examines the photocatalytic and antibacterial activities of pure and Mg-doped ZnS quantum dots (QDs) against Salmonella typhi and Escherichia coli. The incorporation of Mg dopants did not significantly alter the structure of ZnS. However, the QDs showed slight sulfur deficiency and enhanced photocatalytic activity with the presence of Mg dopant.
Article
Materials Science, Multidisciplinary
R. Karthick, P. Sakthivel, C. Selvaraju, Arun Thirumurugan
Summary: Soft chemical methods were used to create magnesium-doped zinc oxide nanoparticles. X-ray diffraction studies showed that the wurtzite hexagonal structure was preserved. The synthesized nanoparticles had no secondary phase and the crystallite size was reduced due to the incorporation of Mg2+ ions. The effects of doping on optical characteristics were examined by computing the band gaps and ultraviolet absorption spectra of the samples. Photoluminescence analysis revealed seven distinct bands due to zinc vacancy, oxygen vacancy, and surface flaws. The antibacterial effects of the synthesized zinc oxide nanopowders were evaluated and exceptionally high efficacy was observed at 7at% Mg doping level.
Article
Spectroscopy
P. Sakthivel, R. V. Mangalaraja, G. Ramalingam, K. Sakthipandi, V. Gowtham
Summary: This paper reports the preparation of Mn-doped ZnS and Mn, Ce co-doped ZnS quantum dots using a facile co-precipitation technique. The synthesized particles were confirmed to have a cubic structure and a particle size of -2 nm through XRD and HR-TEM results. The optical characteristics of the samples were revealed through UV-visible absorbance and transmittance spectra.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Physics, Multidisciplinary
P. Sakthivel, A. Krishnamoorthy, I. Devadoss
Summary: The current study focuses on the impact of Fe3+ dopant on the structural, morphological, optical, and electrochemical characteristics of ZnS quantum dots. Fe3+ ions were doped into ZnS QDs using the co-precipitation technique, with varying doping percentages. X-ray diffraction confirmed the crystalline structure and phase information, with a gradual reduction in crystallite size as Fe3+ doping concentration increased. TEM and SEM data provided structural and morphological validation of Fe3+-doped ZnS QDs. EDAX and FT-IR analyses determined the presence of elements and molecular vibrations. UV-vis optical study revealed maximum transmittance for Fe3+ (5 at.%) doped ZnS quantum dots in the visible region. Initial substitution of Fe3+ ions led to a blue shift in the band gap, while further doping exhibited a red shift. PL emission intensity in the blue region was significantly reduced due to doping ions. Electrochemical study showed that Fe3+ (5 at.%) doped ZnS quantum dots exhibited better electrical response and enhanced specific capacitance.
INDIAN JOURNAL OF PHYSICS
(2023)
