Article
Chemistry, Multidisciplinary
Hao Xu, Wei Zhu, Mingliang Tang, Xiangyuan Wang, Yin Zhang
Summary: This study investigated a multi-component oxide glass consisting of 50B(2)O(3)-(25-x)Al2O3-10Na(2)O-xBi(2)O(3)-15CaF(2)-0.5Dy-0.5Eu (x = 0 , 5 , 10 , 15 , 20 , 25 mol%). The fluoroborate glass exhibited non-crystallinity, as confirmed by X-Ray diffraction. FTIR spectra revealed the structural properties of the glass, characterized by the stretching and vibrating groups of various boric groups. The optical band gap measurements confirmed the presence of unbridged oxygen (NBOs) in the glass samples. The refractive index of the fluoroborate glass increased with the Bi2O3 content, and the glass exhibited strong emission in the blue, yellow, and red range. The emission spectra were analyzed to calculate chromaticity coordinates, color temperature, color rendering index, and color purity. By adjusting the Bi2O3 content and excitation wavelength, the glass was able to emit white light, making it suitable for white light-emitting diodes (WLEDs).
MATERIALS TODAY CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Vidhi, Ankita, Anu, A. S. Rao
Summary: This study presents a detailed spectroscopic analysis of dysprosium ions doped ZnAlNaP glasses, demonstrating their potential for epoxy-free white-light emitting diodes (w-LEDs).
Article
Chemistry, Multidisciplinary
Zhu Meng, Benoit Mahler, Julien Houel, Florian Kulzer, Gilles Ledoux, Andrey Vasil'ev, Christophe Dujardin
Summary: The research found that in CdS/CdSe/CdS spherical quantum wells (SQWs) nanoscintillators, large-size SQWs can generate more excitons under X-ray excitation, but the increased Auger quenching effect makes large SQWs less effective in terms of timing performance.
Article
Chemistry, Physical
Ziqian Lv, Hanyu Xu, Zhiying Wang, Mochen Jia, Yanling Wei, Zuoling Fu
Summary: The research introduces a method to encapsulate CDs on the surface of KLM: Eu3+ to avoid aggregation-induced quenching in the solid state, and achieve the fabrication of a polychromatic nanoplatform emitting white light in multiple colors. By adjusting the proportion of the mixture, warm, neutral, and cold white light can be emitted, and a multi-mode information encryption approach has been designed.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Katherine E. Shulenberger, Sophie C. Coppieters 't Wallant, Megan D. Klein, Alexandra R. McIsaac, Tamar Goldzak, David B. Berkinsky, Hendrik Utzat, Ulugbek Barotov, Troy Van Voorhis, Moungi G. Bawendi
Summary: A spectrally resolved correlation method was developed to study the triply excited state, enabling direct measurements of the recombination pathway for the triexciton. It was found that for core-shell CdSe-CdS nanocrystals, triexciton emission arises exclusively from the band-edge S-like state. Time-dependent density functional theory and extended particle-in-a-sphere calculations show that reduced carrier overlap induced by the core-shell heterostructure can account for the lack of emission observed from the P-like state. These results provide insights for potential control of nanocrystal luminescence using core-shell heterostructures.
Article
Chemistry, Analytical
Hongyi Li, Xiaokun Wen, Yadan Ding, Guorui Wang, Hancheng Zhu, Junping Liu, Huiying Zhao, Xia Hong
Summary: A dual-mode immunoassay strategy based on CdS nanoparticles was developed, which has both photoluminescent and multi-phonon resonance Raman scattering properties. This strategy enables sensitive and specific detection of human immunoglobulin G (HIgG). It demonstrates advantages in detection sensitivity and working range compared to previous methods, with good stability and repeatability.
Article
Materials Science, Ceramics
Ram Gopal, Jairam Manam
Summary: A series of white light emitting Pr3+ activated SrWO4 phosphors with good optical and structural properties were synthesized, which can be used for the fabrication of white LEDs.
CERAMICS INTERNATIONAL
(2022)
Article
Optics
Pengfei Yu, Ruirui Cui, Gangyi Zhang, Jun Zhang, Chaoyong Deng
Summary: A series of Sr3In2WO9:xSm3+ (x = 0.02, 0.03, 0.04, 0.05, and 0.06) and Sr3In2WO9:0.04Sm3+, yEu3+ (y = 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, and 0.35) phosphors were synthesized by solid-state reaction method. Then the microstructure and optical properties of samples were tested by the corresponding means. The results show that the optimal doping concentration of single-doped Sm3+ phosphor is x = 0.04 and the performance of Sm3+/ Eu3+ co-doped phosphors has been improved.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Guan-Zhang Lu, Ya-Jhu Li, Chen-Fu Hou, Rapti Ghosh, Ji-Lin Shen, Meng-Jer Wu, Tai-Yuan Lin, Yang-Fang Chen
Summary: In this work, a cavity-free and stretchable white light laser based on all carbon materials was successfully demonstrated by integrating fluorescent carbon quantum dots and crumpled graphene. The laser exhibits a wide-angle emission and intriguing broadband white-light emission, making it a promising candidate for next-generation optoelectronic devices.
Article
Chemistry, Multidisciplinary
Sagnik Das, Uttam K. Ghorai, Rajib Dey, Chandan K. Ghosh, Mrinal Pal
Summary: This study reports the achievement of highly reproducible, stable, and intense white phosphorescence from phase-pure zinc oxide nanopowder synthesized by a simple, low temperature process. The white light emission has appreciable quantum yield and cool/near cool correlated color temperature, making it suitable for W-LED applications. The presence of zinc interstitial and oxygen interstitial defects responsible for the white phosphorescence was confirmed, and a defect chemistry-based thermodynamic interpretation was proposed to explain the white emission adequately.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Environmental Sciences
Ibrahim Hotan Alsohaimi, Mosaed S. Alhumaimess, Meshal Alzaid, Amr A. Essawy, M. R. El-Aassar, Rasha M. K. Mohamed, Hassan M. A. Hassan
Summary: In this study, CdS quantum dots were successfully confined in a polysulfone membrane to create a photoactive membrane suitable for wastewater treatment under solar illumination. The CdS@PSM membranes were prepared using the nonsolvent induced phase separation approach. Optical measurements showed that 5 wt% loading resulted in the narrowest band gap (2.41 eV) with effective confinement of CdS quantum dots in the PS matrix. The addition of CdS QDs to PSM resulted in blue-shifted emission peaks and improved photodegradation efficiency for methylene blue.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Chemistry, Multidisciplinary
Benjamin T. Diroll, James P. Cassidy, Dulanjan Harankahage, Muchuan Hua, Xiao-Min Lin, Mikhail Zamkov
Summary: This study investigates the two-photon properties of colloidal quantum shells, specifically the CdS/CdSe/CdS quantum shell samples. The results show that these quantum shells exhibit large non-linear absorption cross-sections and advantageous multiexciton physics. They have potential applications in upconversion imaging and can be utilized as excellent gain media for two-photon excitation. Additionally, quantum shell solids support multimodal amplified spontaneous emission due to their broad gain bandwidth and long gain lifetime.
Article
Chemistry, Physical
Tongtong Xuan, Shaoqiang Guo, Wenhao Bai, Tianliang Zhou, Le Wang, Rong-Jun Xie
Summary: This study reports on ultrastable CsPbBr3:Sr/PbBr(OH)/molecular sieve composites with high photoluminescence quantum yield and overall stability. These composites can resist attacks from water, blue light, and heat, and are also suitable for producing high-efficiency Mini-LED backlights.
Article
Materials Science, Multidisciplinary
Marwa M. Sayed, Mohamed A. Osman, Ali A. Osman, Essam R. Shaaban, Samah Shendy, Kamal I. Aly
Summary: This study investigates the structural and optical characteristics of c0-polyarylidene (cyclohexanone/4-tertiary butyl cyclohexanone) CoP6 nanocomposites with cadmium sulfide CdS nanoparticles of various sizes. The optical band gap of the nanocomposites was found to have a slight redshift, while the crystallinity and phase formation studies showed that larger CdS particles retain some crystalline structure. The thermal stability of the nanocomposites varied with the size of the nanoparticles.
Article
Chemistry, Analytical
Hui Xu, Xin You, Yue Lu, Peng Liang, Zhihui Luo, Yiwei Wang, Shaoxiao Zeng, Hongliang Zeng
Summary: A convenient and efficient method using red carbon dots as a fluorescent probe was developed for high-sensitivity detection of Mn and Zn contents in macroalgae. The method showed a good linear relationship and determined the detection limits.
Article
Chemistry, Multidisciplinary
P. Muthukrishnan, P. Prakash, K. Kavi Rasu, P. Sakthivel, A. Muthukrishnaraj
Summary: BPDO is an effective corrosion inhibitor that reduces the corrosion of mild steel in acid conditions. The inhibition efficiency increases with higher BPDO concentration and decreases with elevated temperature. BPDO shows a 98.64% inhibition efficiency at a concentration of only 300 ppm.
JOURNAL OF THE INDIAN CHEMICAL SOCIETY
(2023)
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.
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)
