Article
Chemistry, Physical
Ahmet Yavas, Saadet Giller, Gilnnur Onak, Mustafa Erol, Merve Torman Kayalar, Ozan Karaman, Irmak Dogan Tunc, Sibel Oguzlar
Summary: Li-doped ZnO nanowires were grown on flexible carbon fiber substrates by hydrothermal route to create hybrid antibacterial structures. The antibacterial effect of ZnO nanowires doped with 3% Li was observed to be the most effective against both Escherichia coli and Staphylococcus aureus.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Inorganic & Nuclear
Chun Sun, Jiachen Han, Yiwei Zhao, Xiaohui Liu, Chao Fan, Kai Lian
Summary: A facile in situ hydrolysis method using different solvents is proposed to synthesize blue, green, and yellow phosphorescence ZnO/SiO2 composites. The solvents not only introduce impurities to ZnO but also affect the position of defect energy levels, leading to the variation in luminescent performance. The ZnO/SiO2 composites exhibit stable phosphorescence under extreme conditions, making them suitable for information encryption, fingerprint identification, and white LEDs.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Chun Sun, Jiachen Han, Yiwei Zhao, Xiaohui Liu, Chao Fan, Kai Lian
Summary: A facile method is proposed for achieving high stability and multicolor room temperature phosphorescence of ZnO-based composite materials. These materials can be applied in information encryption, fingerprint identification, and white LEDs.
DALTON TRANSACTIONS
(2023)
Article
Engineering, Environmental
Jung Hoon Kim, Junho Ahn, Han -Min Kim, Joon Young Cho, Do Geun Lee, Youngseok Oh, Jong Hwan Park, Jin Soo Kim, Jung-Keun Yoo, Joong Tark Han
Summary: Researchers successfully debundle and mildly oxidize single-walled carbon nanotubes (SWCNTs) in liquid crystalline phase paste, allowing them to be dispersed in organic solvents and used as conductive additives for lithium-ion batteries (LIBs). The inclusion of SWCNTs in LIB electrodes improves conductivity, electrode integrity, and capacity retention after 100 cycles.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Materials Science, Composites
Junjie Ma, Huilei Jiang, Shujie Hu, Jinwei Song, Xuanhe Zhang, Te Hu, Huijian Ye, Lixin Xu
Summary: This study reports a simple method for preparing high-performance polymer-based graphene electrothermal materials from liquid-phase exfoliated graphene. By combining graphene with multi-walled carbon nanotubes (MWCNTs), PTFE-supported UV-crosslinked graphene/MWCNT hybrid films were successfully prepared. The presence of MWCNTs increases the density of the films and the formation of perfect hybrid networks significantly enhances the electrothermal performance.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Inorganic & Nuclear
Chenyang Zhan, Haomiao Zhu, Sisi Liang, Yingping Huang, Zihao Wang, Maochun Hong
Summary: A strategy to improve the absorption of Mn2+-activated phosphors is proposed by selecting a suitable host, resulting in a high doping concentration of Mn2+. The prepared LAO:0.30Mn(2+) phosphor exhibits intense narrowband green emission, high color purity, and high efficiency, making it suitable for wide-color gamut LCD backlight applications.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Physical
K. C. Sushma, R. B. Basavaraj, D. P. Aarti, M. B. Madhusudana Reddy, G. Nagaraju, M. S. Rudresha, H. M. Suresh Kumar, K. N. Venkatachalaiah
Summary: Intense red light emitting SrZrO3:Eu3+ nanopowders were successfully fabricated using a low-cost eco-friendly hydrothermal route with Aloe vera gel as a surfactant. The nanopowders exhibited a pure single-phase tetragonal structure with no impurity peaks. The energy band gap was calculated to be around 3.98 - 4.27 eV and the particle size was observed to be approximately 42 nm. The powders showed intense red emission under excitation at 395 nm and exhibited good luminescence properties.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Chemistry, Physical
Xiaohui Li, Lei Wang, Xiao Li, Jie Zhang, Min Wang, Renchao Che
Summary: This study successfully synthesized ZnO@MWCNTs with unique multi-dimensional architecture by controlling the pyrolysis time of MOF-5. The ZnO@MWCNTs-4h, consisting of different dimensional components, exhibit strong reflection loss at different frequencies and exceptional microwave absorption performance.
Article
Biochemistry & Molecular Biology
Christos Fragkogiannis, Apostolos Koutsioukis, Vasilios Georgakilas
Summary: This study successfully developed a flexible and low-cost strain sensor by combining commercial melamine sponge with a graphene/carbon nanotubes hybrid. The sensor exhibited excellent piezoresistive behavior and high sensitivity, making it suitable for a wide range of detection.
Article
Materials Science, Multidisciplinary
Zixuan Wu, Xinxin Han, Juan Wang, Yayun Zhou, Ke Xing, Sheng Cao, Jialong Zhao, Bingsuo Zou, Ruosheng Zeng
Summary: Researchers have fabricated a highly efficient and thermally stable broadband NIR emitting phosphor Cs2KGaF6:Cr3+, and successfully developed a high photoelectric conversion efficiency NIR pc-LED. The pc-LED shows excellent performances in night vision security inspection, non-destructive testing, intelligent identification, and biomedical imaging.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Haibo Li, Yi Lv, Zhennan Zhou, Hua Tong, Wei Liu, Gangfeng Ouyang
Summary: The study demonstrates a novel and facile strategy for designing and synthesizing highly luminescent copper halide hybrid structures by fabricating coordinated anionic inorganic modules in ionic species. These structures exhibit high internal quantum yields up to 98% and combine luminescence from ionic and covalent bonds, making them ideal candidates for light-emitting materials in optoelectronic devices as alternative to rare-earth elements.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Materials Science, Composites
Nasim Jan Mohammadi Dashtaki, Amir Hossein Nassajpour-Esfahani, Morteza Bayareh, Pouya Rezai, Ali Doostmohammadi
Summary: The study found that the properties of nanocomposites were dependent on the concentration of CNTs. Nanocomposites fabricated in a quasi-AC electric field showed more uniform and non-agglomerated characteristics. With 1 wt% of CNT, the nanocomposite exhibited suitable electrical conductivity and mechanical properties for microfluidic devices.
JOURNAL OF COMPOSITE MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Yining Wang, Mengmeng Shang, Yixin Sun, Minliang Deng, Xiaole Xing, Peipei Dang, Jun Lin
Summary: By synthesizing Cr3+ doped Ca3Sc2Ge3O12 (CSGG) broadband NIR phosphors, efficient and intelligent NIR light sources are obtained. CSGG:Cr3+ has an emission peak at 785 nm with a FWHM of 106 nm under excitation of 480 nm. Low temperature photoluminescence spectra confirm the broadband NIR emission from two Cr3+ luminescence centers. CSGG:Cr3+ exhibits excellent thermal stability (97% at 100 °C) and low internal quantum efficiency (IQE = 22%). The introduction of Ce3+ enhances IQE from 22% to 61% due to energy transfer and lattice distortion. The mechanism of excellent luminescence thermal stability is explained based on thermal activation energy, Huang-Rhys factor, and thermal ionization effect. The excellent performance of CSGG:Cr3+,Ce3+ NIR phosphors enables their potential applications in night vision security, biological imaging, and nondestructive testing.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Engineering, Environmental
Shangwei Wang, Haiyan Wu, Yufan Fan, Qi Wang, Tao Tan, Ran Pang, Su Zhang, Da Li, Lihong Jiang, Chengyu Li, Hongjie Zhang
Summary: Developing innovative and efficient phosphors with narrow-band emission is crucial for improving the performance of white light-emitting diodes in liquid-crystal display backlight applications. In this study, a near-ultraviolet excitable narrow-band blue-emitting Ba3Lu2B6O15:Bi3+ phosphor was successfully synthesized, demonstrating outstanding photoluminescence properties.
CHEMICAL ENGINEERING JOURNAL
(2022)
Review
Chemistry, Multidisciplinary
Meina Yu, Mohsin Hassan Saeed, Shuaifeng Zhang, Huiyun Wei, Yanzi Gao, Cheng Zou, Lanying Zhang, Huai Yang
Summary: Quantum dots, semiconductor nanoparticles with unique optoelectronic properties, have gained significant interest in academia and industry. However, fabricating quantum dots into solid devices with desired patterns and high efficiency remains a challenge. Recent progress in efficiency improvement and device fabrication of quantum dot-based displays has been achieved through the development of both materials and device engineering.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Physical
Pargam Vashishtha, Lalit Goswami, Shubhendra K. Jain, Neha Aggarwal, Govind Gupta
Summary: This study presents a novel GaN pyramids of Djoser ultraviolet photodetector that operates at high temperature and demonstrates high performance, including the ability to detect weak optical signals and exhibit self-powered behavior. The device's unique Djoser-pyramidal structure contributes to its extraordinary performance, providing decreased surface stress and dislocations.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Electrical & Electronic
Anuj Vinod, Anuj Krishna, N. Vijayan, Ravinder Kumar, S. Kiran, Subhasis Das, S. Swarupa Tripathy, Govind Gupta, Nahar Singh
Summary: Vitamin C, also known as L-ascorbic acid, is essential for living organisms. It has high water solubility and nonlinear optical properties. Single crystal of the titled material was grown using slow evaporation solution technique. The crystal's structure was characterized and found to be in accordance with literature with good crystallinity. Optical performance, functional groups, surface morphology, and mechanical strength of the crystal were evaluated, indicating its potential for nonlinear optical applications.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Physics, Condensed Matter
Pargam Savita, Pargam Vashishtha, Govind Gupta, Ankush Vij, Anup Thakur
Summary: In this work, intense red-NIR emission and color tuning are achieved for broad UV/blue/green excitation range in Cr-doped MgAl2O4 nanocrystals. The defect centers induced by Cr dopants and cation inversion in the crystal structure play a critical role in the emission. The red-NIR emission is enhanced under UV excitation and the emission color can be tuned from red purple to bluish purple and then to red with increasing doping concentration.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Materials Science, Multidisciplinary
Anuj Sharma, Urvashi Varshney, Aditya Yadav, Pargam Vashishtha, Preetam Singh, Govind Gupta
Summary: This article introduces a ultra-sensitive gas sensor based on WSe2 nanorods, which can detect low concentrations (ppb level) of nitric oxide. The sensor shows high selectivity and stability, with fast response and recovery time. The device has potential applications in environmental monitoring, biomedical field, and wearable devices for real-time nitric oxide tracking.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Sonali Mehra, Jyoti Saroha, Ekta Rani, Vikash Sharma, Lalit Goswami, Govind Gupta, A. K. Srivastava, Shailesh Narain Sharma
Summary: Semiconductor photocatalysts, such as SrTiO3 nanoparticles, are widely used for degrading organic pollutants in water through photocatalysis. This study focuses on the photocatalytic degradation of methyl orange and methylene blue using SrTiO3 as a photocatalyst in de-ionized and hard water. The addition of Ag and Au nanoparticles to SrTiO3 enhanced its photocatalytic activity, with Au yielding better results. However, bare SrTiO3 and its composites did not show any degradation of methyl orange in both de-ionized and hard water.
Article
Engineering, Electrical & Electronic
Ravinder Kumar, N. Vijayan, Neha Gupta, Naghma Khan, Mahesh Kumar, Govind Gupta, Khushboo Singh, Aparajita Bandyopadhyay, Amartya Sengupta
Summary: Lithium sulphamate single crystals were grown by slow evaporation solution growth method and analyzed using various spectroscopic techniques to assess their structural and optical properties. Powder-X-ray diffraction and FT-IR were used to determine the structural parameters, while Raman spectroscopic analysis described the Raman bands assignments. UV-vis spectroscopy thoroughly investigated the transmittance percentage, and Tauc's plot was used to calculate the bandgap. Photoluminescence spectroscopy determined the emission spectrum, and time-resolved photoluminescence observed the decay rate. Z-scan technique examined the nonlinear optical behavior, THz spectroscopy analyzed the absorbance behavior in THz region, and DSC and TGA/DTA analysis examined the thermal characteristics of the crystal.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Analytical
Aamir Bashir, Sriraj S. Mestry, Pargam Vashishtha, Govind Gupta, Gaurav A. Bhaduri
Summary: In this study, alpha-Bi2O3 and beta-Bi2O3 were synthesized using a novel one-step solid-solid combustion technique. The use of microwaves as a molecular heating method increased the reaction rate compared to direct or indirect heating. There was a strong relationship between the fuel, polymorphic structure, shape, and optical properties of the synthesized Bi2O3. Photoluminescence studies showed two major visible emissions for all samples, with a broad peak in blue and a narrow peak in green. The intensity of the green characteristic emission depended strongly on the heating method used for synthesis and was more pronounced in samples synthesized with microwaves.
Article
Engineering, Electrical & Electronic
Pargam Vashishtha, Manoj Kumar, Pukhraj Prajapat, Jahangeer Ahmed, Vidya Nand Singh, Govind Gupta
Summary: By utilizing ultraviolet-responsive gallium nitride (GaN) and infrared-activated tin selenide (SnSe), a broadband heterojunction-based optical detector was fabricated, combining the detection capabilities of GaN in the ultraviolet to visible range and SnSe in the visible to shortwave-infrared range. The detector exhibited high responsivity, low dark current, and edge contact geometry for direct access to the heterostructure interface of both materials. The device showed excellent performance across the ultraviolet-C to shortwave-infrared region, with a maximum responsivity of 128 AW-1, a noise equivalent power of 5.2 x 10-14 WHz- 1/2, and a quantum efficiency of 5 x 104% for ultraviolet illumination, and a maximum responsivity of 6.06 AW-1 and noise equivalent power of 1 x 10-12 WHz- 1 for infrared illumination. This research opens up new possibilities for wideband detection in optoelectronic applications utilizing heterostructure-based devices.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Radhe Shyam, Deepak Negi, Komal Shekhawat, Fouran Singh, Devarani Devi, Pargam Vashishtha, Govind Gupta, Subingya Pandey, Pamu Dobbidi, Srinivasa Rao Nelamarri
Summary: The present study demonstrates the tuning of structural, topography, and luminescence properties of 30 keV Li-ion implanted (K, Na)NbO3 thin films synthesized using RF sputtering. The results show that the crystallinity and morphology of the films are affected by Li-ion implantation, with a decrease in crystallinity and a change in the morphology. The transmittance of the films is minimally improved, while the optical band gap and the relative PL intensity in the ultraviolet region are increased with the ion fluence. The carrier lifetime is also increased after ion implantation.
RESULTS IN PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Pargam Vashishtha, Pukhraj Prajapat, Anuj Sharma, Preeti Goswami, Sumeet Walia, Govind Gupta
Summary: Transition-metal-dichalcogenides-based near-infrared photodetectors are widely studied due to their applications in various sectors. However, the thermal stability of these detectors hampers their commercialization. In this study, we have solved this problem by depositing a nano fence-like Molybdenum di-sulphide thin film on a Silicon-Nitride substrate. The fabricated device shows self-driven behavior and exhibits enormous photo-response and thermal stability.
MATERIALS RESEARCH BULLETIN
(2023)
Review
Materials Science, Multidisciplinary
Pukhraj Prajapat, Deependra Kumar Singh, Govind Gupta
Summary: III-nitrides are versatile materials that have the potential to be used in a wide range of interdisciplinary applications. However, the quality and performance of conventional III-nitride devices are constrained due to lattice and thermal mismatches with the substrate. This issue can be addressed by growing III-nitrides on unconventional substrates, which have significantly reduced mismatches and potential advantages such as wavelength tunability and lower efficiency droop. This perspective critically examines recent advances in III-nitride epitaxy on unconventional substrates and explores the challenges and constraints of practical implementation.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Anchal Rana, Aditya Yadav, Govind Gupta, Abhimanyu Rana
Summary: We present an efficient method of growing infrared (IR) sensitive mixed phase of V7O16 and V2O5 thin films at low temperatures. The mixed phase can be stabilized by annealing amorphous VxOy at 300-400 degrees C, and is fully converted into V2O5 after annealing at 450 degrees C. The optical transmission of the films increases with the content of V2O5, while the electrical conductivity and optical bandgap decrease. The IR sensitivity is explained by plasmonic absorption by the V7O16 degenerate semiconductor.
Article
Materials Science, Multidisciplinary
Vishnu Aggarwal, Sudhanshu Gautam, Aditya Yadav, Rahul Kumar, Bipul Kumar Pradhan, Brajesh S. Yadav, Govind Gupta, Senthil Kumar Muthusamy, Sumeet Walia, Sunil Singh Kushvaha
Summary: Recently, there has been a great demand for highly responsive photodetectors that can detect a wide range of wavelengths. Researchers have successfully fabricated a broadband metal-semiconductor-metal photodetector by integrating sputtered Bi2Se3 with laser molecular beam epitaxy grown GaN film. This photodetector shows high responsivity in both the ultraviolet and near-infrared regions.
MATERIALS RESEARCH BULLETIN
(2024)
Article
Materials Science, Multidisciplinary
Ankita Rawat, Nitesh K. Chourasia, Saurabh K. Saini, Gaurav Rajput, Aditya Yadav, Ritesh Kumar Chourasia, Govind Gupta, P. K. Kulriya
Summary: The rapid advancement of nanomaterials has paved the way for technological breakthroughs. MXenes have gained attention due to their unique properties. This study validates the synthesis of MXene and investigates the influence of centrifugation speed on its structure and optical properties.
MATERIALS ADVANCES
(2023)
Article
Optics
Pargam Vashishtha, Ajit Dash, Kapil Kumar, Pukhraj Prajapat, Mahesh Kumar, Sumeet Walia, Govind Gupta
Summary: This study presents a high-performance photodetector based on antimony selenide, which exhibits fast and high response as well as thermal stability across a wide range of wavelengths. The findings provide insights for designing high thermal stability detectors and promoting the use of such materials in photodetector applications.
OPTICS AND LASER TECHNOLOGY
(2024)
