Article
Chemistry, Multidisciplinary
Shankari Nadupalli, Sergej Repp, Stefan Weber, Emre Erdem
Summary: This study investigates the intrinsic defect structure of ZnO and its influences. The results demonstrate that the concentration and position of intrinsic defects in ZnO can be tuned by changing the nanocrystal size, while emissions can be tuned by post-annealing treatments.
Article
Materials Science, Ceramics
Lutfi Arda, Ozgul Karatas, Mehmet Can Alphan, Ersin Ozugurlu
Summary: Zn0.95-xMg0.05CoxO nanoparticles with varying cobalt concentrations were synthesized using the sol-gel technique. The nanoparticles exhibited a single phase structure and their surface morphology and emission spectra were influenced by synthesis conditions and doping elements. The effect of cobalt concentration on line widths and g-factor of ESR spectra was investigated. Furthermore, it was found that Mg/Co co-doped ZnO nanoparticles exhibited room temperature ferromagnetism, making them potential materials for spin-based technologies.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Nizar Ben Moussa, Mohamed Lajnef, Nessrine Jebari, Cedric Villebasse, Fabien Bayle, Julien Chaste, Ali Madouri, Radouane Chtourou, Etienne Herth
Summary: In this study, low-cost sol-gel spin-coating technique was used to synthesize eco-friendly ZnO multilayer films with excellent optical properties and specific orientation suitable for piezoelectric applications. The ZnO sol-gel thin-films using precursor solutions of molarity 0.75 M exhibited an average optical transparency above 98% and an optical band gap energy of 3.42 eV, showing potential for eco-friendly and cost-effective applications in complementary metal-oxide-semiconductor (CMOS) and integrated circuits (IC).
Article
Engineering, Electrical & Electronic
B. Sankara Reddy, B. Sreenivasulu, N. Koteeswara Reddy, S. Venkatramana Reddy, P. Bharath Kumar
Summary: In this study, energetic ultraviolet light-emitting ZnO nanoparticle powders were developed by co-doping single and bivalent metal ions. The analysis showed that the ZnO nanoparticle powders exhibited an enhanced optical band gap and decreased particle size with increased metal ions doping concentrations.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Nan Wang, Yue Wang, Nan Ding, Yanjie Wu, Lu Zi, Sen Liu, Donglei Zhou, Jinyang Zhu, Xue Bai, Wen Xu, Hongwei Song
Summary: This study synthesized Ag@SiO2@CsPbX3 composites for the first time, achieving remarkable luminescence enhancement for perovskite nanocrystals, especially a more than 1,000 times improvement in blue emitting fluorescence of CsPbCl1.5Br1.5. The manipulation of localized optical fields using metal nanostructures is a promising strategy to boost the luminescence performance of perovskite nanocrystals.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Physics, Condensed Matter
Z. Sh. Shaymardanov, B. N. Rustamova, R. R. Jalolov, Sh. Z. Urolov
Summary: The influence of various native defects on the structural, optical and photocatalytic characteristics of ZnO nanocrystals with homogeneous morphological properties was investigated. It was found that the nature, concentration, and location of defects have a significant impact on the photocatalytic activity of ZnO nanocrystals.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Materials Science, Multidisciplinary
Zhengguang Guo, Shouhong Chen, Ping Yang
Summary: The study revealed that ZnO with different dopants exhibit different optical properties, with Al-ZnO having high light transmittance, while Eu-ZnO and (Al, Eu)-ZnO showing stronger absorption in the visible and ultraviolet regions. This provides theoretical implications for the research on light protection devices.
Article
Chemistry, Physical
Adedayo M. Sanni, Sydney N. Lavan, Zhen-Fei Liu, Aaron S. Rury
Summary: This study demonstrates the formation of color centers capable of emitting narrowband light emission from solution-phase precursors, providing new insights into the design and characterization of single photon emitters for quantum information processors. Experimental and first-principles calculations reveal the underlying electronic states and mechanisms responsible for the narrow peaks observed in the light emission spectra of defective samples of two-dimensional hybrid organic-inorganic perovskite. Additionally, the potential of solution-processed, self-assembled quantum materials in the development of single, near-infrared photon emitters for information processing and storage is highlighted.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Adedayo M. Sanni, Sydney N. Lavan, Zhen-Fei Liu, Aaron S. Rury
Summary: The study demonstrates the formation of defective samples of the two-dimensional hybrid organic-inorganic perovskite, which emit narrow peaks in light emission spectra. The results suggest that the narrow peaks are related to thermal activation and likely stem from defect states caused by iodine and hydrogen vacancies.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Engineering, Electrical & Electronic
Mitesh Chakraborty, Dhritiman Banerjee, Sujeet Singh, Joydip Dutta
Summary: The zinc oxide (ZnO) phosphors co-doped with Gd3+/Yb3+ were synthesized using the solid-state reaction method. The compound ZGYO {Zn(1 1.5x- 1.5y)GdxYbyO} was prepared for different molar concentrations of Yb (y) = 0.00, 0.01, 0.03, 0.05 and Gd (x) fixed at 0.01. XRD analysis confirmed the hexagonal phase of the ZnO wurtzite structure, while EDX and XPS spectra confirmed the successful incorporation of Gd3+ and Yb3+ in the ZnO lattice.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
George Tzvetkov, Martin Tsvetkov, Tony Spassov
Summary: A novel hierarchically-structured edelweiss-like ZnO microparticles were successfully fabricated using a single-step wet-chemical synthetic approach. The photoluminescence properties of the microparticles were analyzed, showing intense UV-violet emission at room temperature and predominant UV-violet-blue co-emission after low-temperature annealing. The relationship between the photoluminescence properties and intrinsic defects in ZnO was examined in this study.
Article
Chemistry, Multidisciplinary
Ali Hassan, Abbas Ahmad Khan, Yeong Hwan Ahn, Muhammad Azam, Muhammad Zubair, Wei Xue, Yu Cao
Summary: Temperature-, excitation wavelength-, and excitation power-dependent photoluminescence spectroscopy was used to investigate the orientation-dependent emissions of ZnO single crystals. The results showed that ZnO crystals with < 0001 > orientation exhibited strong and sharp emission intensity with suppressed deep level defects, indicating better crystallinity. At low temperature, neutral donor-to-bound exciton transition dominated, while free-exciton transition emerged at higher temperatures in all orientations. The intensity dependence on excitation power followed a power-law, with different power-law exponents for different orientations. The comprehensive analysis suggested that < 0001 > orientation had intense excitonic emission in the near band edge region, making it favorable for fabricating highly efficient optoelectronic devices.
Article
Chemistry, Multidisciplinary
Abdolhossein Sa'aedi, Alaa Ahmed Akl, Ahmed Saeed Hassanien
Summary: This article describes the synthesis and characterization of pure ZnO and Rb-doped ZnO nanoparticles using sol-gel technology. The samples were analyzed using X-ray diffraction, energy-dispersive X-ray spectroscopy, and field-emission scanning electron microscopy. The results showed that RbxZn1-xO NPs have a hexagonal wurtzite structure and their properties change with the Rb concentration. The particle size of the NPs decreased with increasing Rb concentration, and the compositions were in agreement with the selected elements.
Article
Physics, Applied
Hossein J. Sharahi, Mohsen Janmaleki, Laurene Tetard, Seonghwan Kim, Hamed Sadeghian, Gerard J. Verbiest
Summary: The development of acoustic subsurface atomic force microscopy has made significant progress since the early 1990s, allowing for three-dimensional imaging at single-digit nanometer resolution. Recent advances provide a quantitative understanding of contrast mechanisms and open the door to future applications. Remaining challenges include the need for new actuators, near-field picosecond ultrasonics, and integration with other techniques to achieve multi-functional non-destructive three-dimensional imaging at the nanoscale.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Brandon J. Furey, Benjamin J. Stacy, Tushti Shah, Rodrigo M. Barba-Barba, Ramon Carriles, Alan Bernal, Bernardo S. Mendoza, Brian A. Korgel, Michael C. Downer
Summary: Colloidal nanocrystalline silicon quantum dots (nc-SiQDs) excited by two-photon in the near-infrared (NIR) range have potential applications in deep biological imaging. The two-photon absorption (2PA) cross section of colloidal nc-SiQDs is measured, and it is found to be smaller for smaller diameter nanocrystals. The efficiencies of nc-SiQDs for bioimaging using two-photon excited photoluminescence (2PE-PL) are compared to other quantum dots and molecular fluorophores and found to be comparable or superior at greater depths.
Article
Biochemical Research Methods
Terri F. Bruce, Tyler J. Slonecki, Lei Wang, Sisi Huang, Rhonda R. Powell, R. Kenneth Marcus
Article
Nanoscience & Nanotechnology
Indushekhar Persaud, Achyut J. Raghavendra, Archini Paruthi, Nasser B. Alsaleh, Valerie C. Minarchick, James R. Roede, Ramakrishna Podila, Jared M. Brown
Article
Biophysics
Bipin Sharma, Prakash Parajuli, Ramakrishna Podila
Article
Nanoscience & Nanotechnology
Shailendra Chiluwal, Nawraj Sapkota, Apparao M. Rao, Ramakrishna Podila
ACS APPLIED MATERIALS & INTERFACES
(2020)
Article
Biophysics
Wren E. Gregory, Bipin Sharma, Longyu Hu, Achyut J. Raghavendra, Ramakrishna Podila
Article
Materials Science, Multidisciplinary
Mahendra K. Sreeramoju, John P. Selegue, Ramakrishna Podila, Apparao M. Rao
Summary: Soluble, oxidized, nanodiamond-derived carbon nano-onions (ON-CNOs) were synthesized by treating nanodiamond-derived carbon nano-onions (N-CNOs) with a mixture of fuming sulfuric acid and concentrated nitric acid. ON-CNOs can dissolve in polar organic solvents and water due to the presence of acidic functional groups and adsorbed CCFs. The structure and distribution of functional groups on ON-CNOs before and after CCF removal were studied using various analytical methods.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Plant Sciences
Tyler J. Slonecki, William B. Rutter, Bode A. Olukolu, G. Craig Yencho, D. Michael Jackson, Phillip A. Wadl
Summary: The genetic diversity and population structure of a sweetpotato germplasm collection were characterized, and six unique genetic groupings were identified across seven geographic regions. Breeder germplasm subsets were established to maintain diversity for future studies linking genotype with phenotype.
FRONTIERS IN PLANT SCIENCE
(2023)
Review
Chemistry, Multidisciplinary
Shailendra Chiluwal, Apparao M. Rao, Ramakrishna Podila
Summary: This article reviews key technological developments in intercalation, conversion, and alloy-type anode and cathode materials of lithium-based rechargeable batteries. It also discusses strategies for improving electrolytes and current collectors, and provides an outlook on misleading battery characteristics, impending challenges, and future directions. Lastly, the importance of lab-based research at the pouch cell level, practical energy densities, and scalability and economic viability of different battery materials and architectures is emphasized.
NANOTECHNOLOGY REVIEWS
(2021)
Article
Nanoscience & Nanotechnology
Fengjiao Liu, Shailendra Chiluwal, Anthony S. Childress, Christopher Etteh, Kymani Miller, Marlena Washington, Apparao M. Rao, Ramakrishna Podila
Summary: Graphene foams (GFs) are shown to be an ideal 3D lightweight current collector for lithium-sulfur batteries (LSBs), enabling high sulfur loading and increased capacity. GF-SPAN cathodes demonstrate capacities of up to 200 mAh g(electrode)(-1) at the electrode level, surpassing conventional Al/C electrodes by 3 times.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Bipin Sharma, Shailendra Chiluwal, Ramakrishna Podila
Article
Toxicology
Nasser B. Alsaleh, Valerie C. Minarchick, Ryan P. Mendoza, Bipin Sharma, Ramakrishna Podila, Jared M. Brown
JOURNAL OF IMMUNOTOXICOLOGY
(2019)
Article
Chemistry, Multidisciplinary
Lakshman K. Ventrapragada, Stephen E. Creager, Apparao M. Rao, Ramakrishna Podila
NANOTECHNOLOGY REVIEWS
(2019)
Article
Chemistry, Physical
Pankaj Kumar Rastogi, Krishna Rani Sahoo, Pallavi Thakur, Rahul Sharma, Sumit Bawari, Ramakrishna Podila, Tharangattu N. Narayanan
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2019)