Editorial Material
Chemistry, Physical
Salmon Landi
Summary: Two papers in Journal of Molecular Liquids mistakenly named the same equation differently. This comment clarifies these errors to prevent misunderstanding regarding determining band gap energy from diffuse reflectance measurements using Kubelka Munk model and Tauc plot.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Physical
Eike S. Welter, Seema Garg, Roger Glaeser, Michael Goepel
Summary: This study investigates the influence of different evaluation methods on the determination of band gap energy (E-g) in semiconductors. By evaluating 32 literature sources and conducting their own experiments, the authors find that the choice of evaluation method can lead to differences in E-g up to 0.87 eV. In the case of P25 loaded with CuO, contradictive effects of metal loading on E-g are observed using different methods. Different phase compositions of TiO2 also yield EM-dependent results. The paper provides recommendations for the use of evaluation methods and highlights common pitfalls in determining E-g via UV/Vis DRS.
Article
Chemistry, Physical
Isha Gupta, Devender Singh, Sitender Singh, Pawan Kumar, Shri Bhagwan, Vinod Kumar
Summary: Urea-assisted solution combustion method was used to synthesize yellowish-white light emitting Dy3+ doped Gd4Al2O9 phosphors. Rietveld refinement analysis showed that all the doped samples have a monoclinic crystal structure. The crystallite size was determined using Scherrer's formula and Williamson-Hall linear fitting method. The optical energy band gap of the optimized sample was calculated to be 5.11 eV. TEM micrograph revealed the presence of non-uniform agglomerated particles. Photoluminescence excitation and emission profiles of the doped phosphors were analyzed and found to have intense excitation peak at 351 nm and sharp emission lines at 481, 573, and 667 nm. The chromaticity coordinates and correlated color temperature values indicated that the doped samples can be used in single-phase phosphor converted WLEDs.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Physics, Condensed Matter
Salmon Landi Jr, Iran Rocha Segundo, Catia Afonso, Orlando Lima Jr, Manuel F. M. Costa, Elisabete Freitas, Joaquim Carneiro
Summary: The determination of band gap energy of semiconductors powder materials can be achieved through diffuse reflectance spectroscopy. In this study, the classical theory proposed by Kubelka and Munk as well as the Tauc plot method are investigated. The results show that the samples treated with a mechaniochemical process exhibit lower band gap energy compared to previous studies.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Physics, Condensed Matter
Salmon Landi, Iran Rocha Segundo, Elisabete Freitas, Mikhail Vasilevskiy, Joaquim Carneiro, Carlos Jose Tavares
Summary: The authors demonstrate how to use the K-M function and apply it to determine the E-g of TiO2 semiconductor powder, highlighting drawbacks and misconceptions in the procedure of E-g determination from the K-M theory and DRS data, emphasizing that directly determining E-g from the K-M function is inadequate.
SOLID STATE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Mohd Rehan Ansari, Anamika Kem, Priya Agrohi, Prashant Kumar Mallick, Pritty Rao, Koteswara Rao Peta
Summary: Spinel structured zinc ferrite (ZF) was synthesized using a green method with microwave-assisted solution combustion and a non-toxic reducing agent from hibiscus leaves extract. Analysis confirmed the cubic spinel structure of ZF with an average crystallite size of 10.47 nm. Scanning electron microscopy revealed agglomerated spherical shapes and transmission electron microscopy imaging estimated an average particle size of 11.52 nm. Zn, Fe, and O were the main elements present in the spinel ZF, as analyzed by energy dispersion X-ray analysis. Fourier transform infrared and Raman spectra showed the presence of tetrahedral and octahedral lattice sites related to Zn-O and Fe-O bonds. Diffuse reflectance spectroscopy indicated an optical energy bandgap of 2.17 eV for spinel ZF. Vibrating sample magnetometer results demonstrated the superparamagnetic nature of spinel ZF at room temperature. Antibacterial tests showed complete inhibition of bacterial growth of Escherichia coli DH5α after 24 hours.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Chemistry, Physical
John Samuel, Joseph Eugin Shaji, Sathiya Dhas Sahaya Jude Dhas, Savarimuthu Suresh, Varghese Sherlin Vinita, Chellaswamy Saraswathy Biju
Summary: A highly efficient Cd, Ba co-doped ZnO nanomaterial with integrated performances of widespread polychromatic UV-visible luminescent emission, wide band gap, and enhanced UV absorbance has been prepared. It shows a positive UV-blocking execution and better bacterial inhibition, making it a promising alternative UV-blocking material for biomedical applications.
SURFACE AND INTERFACE ANALYSIS
(2023)
Article
Engineering, Chemical
Yun Ma, Hanqi Xu, Xiaofang Shen, Yuehong Pang
Summary: In this study, silver nanoparticles stabilized with L-Cysteine were successfully synthesized and shown to possess antimicrobial activity. Analysis using various techniques revealed that the L-Cys capped AgNPs were pure and spherical in shape.
ADVANCED POWDER TECHNOLOGY
(2021)
Article
Chemistry, Physical
Sajjad Hussain Parrey, Irshad Ahamad, Tasneem Fatima, Rabia Ahmad, Salim Manoharadas, Mohammad Altaf, Abdulwahed Fahad Alrefaei, Ahmed Yacine M. Badjah Hadj, Abbul Bashar Khan
Summary: The study on silver nanoparticles synthesized using leaf extract of Acacia leucophloea showed that in the presence of CTAB, the nanoparticles are smaller in size, more uniform in shape, and exhibit higher antibacterial efficacy.
COLLOID AND POLYMER SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Nishant T. Tayade, Manish P. Tirpude
Summary: This article investigates the microstructure of PbS nanomaterial and analyzes its grain size through X-ray diffraction and scanning electron microscope. It compares different models and methods, including the Balzar approach, UDM, USDM, UDEDM, mWHP model, E-hkl/E-0 ratio model, direct fitting of simplified WH model with introducing new approach, and the modified Kibasomba-WH model. Additionally, it examines the applicability of other non-WH methods such as the Scherrer formula method, modified Scherrer method, stress-strain methods, and Halder-Wagner method in different structures.
BULLETIN OF MATERIALS SCIENCE
(2023)
Article
Biotechnology & Applied Microbiology
Xiao Chen, Sheng Dai, Luying Liu, Peng Liu, Peng Ye, Yuzhen Liao, Ansha Zhao, Ping Yang, Nan Huang, Jiang Chen
Summary: This study proposes a simple UV-photo-functionalization strategy to improve the hemocompatibility of silver nanoparticles (AgNPs) by utilizing the anticoagulant properties of titanium dioxide (TiO2) nanoparticles. The modified Ag@TiO(2)NPs coating showed excellent antibacterial properties and desirable hemocompatibility.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Kun Li, Zhaoxi Liu, Xiaoyu Liu, Lei Wang, Jiayu Zhao, Xunlian Zhang, Yun Kong, Min Chen
Summary: A new method for rapid synthesis of nano silver chloride with anti-biofilm activity is proposed, utilizing bacterial extracellular polysaccharides to adsorb silver ions and induce the formation of small-sized nano silver chloride. The novel complex demonstrates highly effective anti-biofilm and bactericidal activity, suggesting its potential as a long-term antibacterial material due to the high stability of nano silver chloride.
Article
Crystallography
Faheem Ahmed, Suliman Yousef AlOmar, Fadwa Albalawi, Nishat Arshi, Sourabh Dwivedi, Shalendra Kumar, Nagih Mohammed Shaalan, Naushad Ahmad
Summary: The silver nanoparticles synthesized using a one-step microwave irradiation technique exhibited a single-phase face-centered cubic structure with an absorption maximum at 420 nm, confirming their formation. Transmission electron microscopy analysis revealed the nanoparticles to be spherical with an average diameter of approximately 6 nm. These nanoparticles showed strong antibacterial properties against various microorganisms, with the highest zone of inhibition observed against Pseudomonas aeruginosa.
Article
Crystallography
Pratishtha Kushwaha, Pratima Chauhan
Summary: The synthesis of iron oxide nanoparticles using ferric nitrate and ethylene glycol was investigated through X-ray diffraction at different calcination temperatures. The analysis showed variations in crystallite size with temperature and differences in calculated sizes using various methods. FE-SEM and HR-TEM confirmed the spherical shape of the synthesized nanoparticles.
Article
Materials Science, Paper & Wood
Wenjing Liu, Wei Cheng, Man Zhou, Bo Xu, Ping Wang, Qiang Wang, Yuanyuan Yu
Summary: In this study, silver/melanin-like nanoparticles (Ag-SMNPs) were synthesized and successfully modified on fabrics, which demonstrated excellent anti-ultraviolet radiation, photothermal, and antibacterial properties while maintaining outstanding air and moisture permeability.
Article
Polymer Science
R. Singaravelan, M. Shanmugam, A. Abdul Salam, P. Vasanthi, M. Magesh, Durai Mani, Young-Ho Ahn
Summary: This study investigates the preparation of monodispersed nano brass using a facile electrochemical technique, exploring its size and surface morphology through various analytical methods. The results demonstrate its potential applications in photocatalysis and antimicrobial efficacy, showing promising properties for environmental and biomedical fields.
JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS
(2021)
Article
Chemistry, Inorganic & Nuclear
R. Singaravelan, A. Abdul Salam, Nirmala Krishnan, P. Vasanthi
Summary: This study investigates the electrocatalytic behavior, organic waste degradation, and antimicrobial properties of copper nanocubes synthesized through a inexpensive electrodeposition process. The results demonstrate the improved electrocatalytic efficiency of CuNCs modified glassy carbon electrodes and their high effectiveness in removing harmful microbial contaminants.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Chemistry, Inorganic & Nuclear
V. Gopalakrishnan, R. Singaravelan
Summary: This study describes the biosynthesis of gold nanoparticles using neem blossom extract, resulting in enhanced in vitro anti-diabetic and antioxidant properties. The formation and characteristics of the nanoparticles were confirmed using various methods, such as surface plasmon resonance and Fourier-transform infrared spectroscopy. The particles showed crystalline nature and demonstrated high antioxidant efficiency and enzyme inhibition in assays. The nanoparticles also exhibited exceptional microbicidal efficacy against both gram-positive and gram-negative bacteria, suggesting their potential for biomedical applications.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
A. Abdul Salam, R. Singaravelan, P. Vasanthi, S. Bangarusudarsan Alwar
JOURNAL OF NANOSTRUCTURE IN CHEMISTRY
(2015)
Article
Chemistry, Multidisciplinary
R. Singaravelan, S. Bangaru Sudarsan Alwar
JOURNAL OF NANOSTRUCTURE IN CHEMISTRY
(2014)