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
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
Engineering, Electrical & Electronic
Cecilia I. Vazquez, Felipe Montero Bruni, Ana Maria Baruzzi, Rodrigo A. Iglesias
Summary: A non-enzymatic photoelectrochemical method using a CdS|TiO2 nanotubes photoanode is proposed for the detection of aqueous sulfide and ascorbic acid. The sensitivity of both the CdS|TiO2 and CdS|Pt photoanodes is high in the visible range, allowing for detection at micromolar levels for sulfide and ascorbic acid. However, the detection of H2O2 leads to the degradation of CdS and the release of Cd2+ ions into the analyte solution.
IEEE SENSORS JOURNAL
(2023)
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
Materials Science, Multidisciplinary
J. I. Contreras-Rascon, J. Diaz-Reyes, A. Flores-Pacheco, R. Lozada Morales, M. E. Alvarez-Ramos, J. A. Balderas-Lopez
Summary: This work investigates the modifications of the crystalline structure and properties of nanostructured cadmium sulphide (CdS) thin films by introducing gold quantum dots to form a hybrid metal-semiconductor system. Various characterization techniques such as XPS, XRD, and TEM were used to study the structural changes, showing a significant impact on properties in the CdS-Au samples, indicating a strong quantum confinement effect.
RESULTS IN PHYSICS
(2021)
Article
Chemistry, Analytical
Luping Tang, Yangyang Zhang, Chen Liao, Yingqing Guo, Yingtao Lu, Yixuan Xia, Yiwei Liu
Summary: In this study, the temperature-dependent photoluminescence (PL) properties of CdS/ZnS core/shell quantum dots (QDs) were investigated. The results showed that the band-edge emission (BEE) intensity decreased with increasing temperature, while the surface-state emission (SSE) intensity first increased and then decreased. The PL spectra exhibited a redshift in peak energies and an increase in full width at half-maximum (FWHM) as the temperature increased. Furthermore, the CIE chromaticity coordinates showed a dramatic change with temperature. These findings suggest that CdS/ZnS core/shell QDs have potential applications as temperature sensors.
Article
Materials Science, Multidisciplinary
Alexey S. Lipatiev, Georgiy Yu Shakhgildyan, Maxim P. Vetchinnikov, Hojeong Lee, Jong Heo, Sergey Lotarev, Vladimir N. Sigaev
Summary: In this study, the structure of microdomains containing CdS nanoparticles in glass written by laser was examined using transmission electron microscopy. CdS nanocrystals had a size distribution with multiple peaks, with quantum dots of minimal size near the edges. The CdS nanocrystals showed a significant increase in size from the periphery to the center of the laser-written microdomain, with potential applications in advanced optical data encoding and security tagging.
Article
Biochemistry & Molecular Biology
Ilia Litvinov, Anna Salova, Nikolay Aksenov, Elena Kornilova, Tatiana Belyaeva
Summary: In this study, the photophysical characteristics of core/shell InP/ZnS quantum dots (InP-QDs) were analyzed in cell culture medium, salt solutions, and directly in the cells. It was found that InP-QDs were internalized into endolysosomes in HeLa and A549 cells with similar dynamics to Cd-based QDs, but the two cell lines accumulated them differently. InP-QDs were reliably detected in the endosomes despite their low quantum yields. Factors such as cell culture medium, acidic pH, and salt solutions were found to affect the photoluminescence lifetime of InP-QDs. The scatter between endosomes in the same cell was observed, indicating the complex impact of these factors on the state of InP-QDs. The toxicity of InP-QDs for both cell lines at concentrations higher than 20 nM was demonstrated.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Inorganic & Nuclear
Chuqiao Wu, Shuting Zhang, Yuhui Zheng, Aiqi Wang, Qiming Zhao, Wenjie Sun, Wanqiang Liu, Chenggang Long, Qianming Wang
Summary: In this article, a solvent-type passivation (STP) strategy is introduced to achieve better control and reproducibility of sulfur dots by using short-chain molecular species instead of polyethylene glycol (PEG) as the capping agent. The strategy does not require PEG or any other capping agent, and the surface defects of sulfur dots are passivated by sodium ethoxide generated through the direct reaction of ethanol with NaOH. The sulfur dots obtained through this strategy show self-quenching resistant feature in the solid state and an extended fluorescence band up to 645 nm.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Physical
Igor P. Vorona, Bella D. Shanina, Volodymyr M. Dzhagan, Galyna Yu. Rudko, ValentynaV Nosenko, Oleksandra Ye. Raievska, Oleksandr L. Stroyuk
Summary: In this study, the quasi-white photoluminescence emission of colloidal CdS nanocrystals embedded in a polymer matrix was investigated using optically detected magnetic resonance spectroscopy. The results showed that the registered ODMR spectra were complex, consisting of both positive and negative signals. The positive signal was found to depend on both particle size and the range of the photoluminescence wavelength, and it was attributed to complex paramagnetic centers formed by electron-and hole-trapping species coupled by an exchange interaction. The sharp negative signal, however, was independent of the nanocrystal size and was assigned to a sulfur vacancy acting as a center of nonradiative recombination.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Physics, Applied
Xiaorui Wang, Tao Wang, Dapeng Yu, Shijie Xu
Summary: The article observes large negative thermal quenching of the yellow luminescence in non-polar InGaN/GaN quantum well samples when carriers are optically excited in the quantum well layers. A simple model considering the thermal transfer of carriers is proposed to interpret this phenomenon and the thermal activation energy of carriers is determined through data fitting.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Brijlata Sharma, Rajesh Lalwani, Ruby Das, Devi Singh Raghuwanshi
Summary: Undoped and Ni-doped nanocrystalline CdS thin films were successfully fabricated using the sol-gel spin coating technique. The films exhibited polycrystalline structure with cubic orientation and an average crystallite size ranging from 6 to 12 nm. The optical band gap of the films was found to be in the range of 2.48-2.70 eV, indicating blue shifting in band edge due to quantum confinement effect. Additionally, the low temperature resistivity of the films decreased with increasing Ni concentration as observed from dc two probe measurements.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Multidisciplinary
Hui Zhang, Xiaohu Mi, Bowen Kang, Yunkai Wu, Tingting Zhang, Pai Liu, Xiaowei Sun, Zhenglong Zhang, Ning Liu, Hongxing Xu
Summary: Colloidal nanocrystals play a significant role in optoelectronic devices and their properties can be improved through ligand modification, which can enhance charge transport and emission characteristics in LEDs.
Article
Chemistry, Multidisciplinary
Adi Harchol, Yahel Barak, Kira E. Hughes, Kimberly H. Hartstein, Huygen J. Jobsis, P. Tim Prins, Celso de Mello Donega, Daniel R. Gamelin, Efrat Lifshitz
Summary: This study elucidates the recombination processes and spin properties of copper-doped CdSe/CdS and CuInS2 colloidal quantum dots (CQDs) using optically detected magnetic resonance spectroscopy. The findings support different models for the magneto-optical properties of these important materials.
Article
Chemistry, Physical
Fang Yao, Ruiming Li, Zhenglin Jia, Songxue Bai, Yujie Yang, Yanyan Li, Yalun Xu, Guojia Fang, Qianqian Lin
Summary: Chalcogenide-based semiconductors are highly promising for optoelectronic devices due to their low toxicity, cost-effectiveness, stability, and tunable properties. However, limited understanding of charge recombination mechanisms and trap states hinders their development. A comprehensive study on bismuth-based chalcogenide thin films was conducted to investigate the influence of post-treatments. The key findings were that post-treatment with Bi enhanced crystallinity and mobility but also increased carrier density, while post-treatment with sulfur increased carrier lifetime and mobility by passivating trap states.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Sheo K. Mishra, U. K. Tripathi, Rajesh Kumar, R. K. Shukla
Summary: The study reveals that Ag-doped ZnO NPs can effectively enhance defect-mediated visible emissions and suggest that Ag doping may result in red-shift of UV peak. Pure ZnO exhibits anomalous UV sensing, while Ag-doped ZnO NPs do not have this characteristic. ZnO NPs doped with 7 wt% Ag demonstrate efficient UV photoresponsive behavior.
Article
Materials Science, Multidisciplinary
Susheel K. Singh, R. K. Shukla, Rajesh Kumar, U. K. Tripathi, Sheo K. Mishra
Summary: A simple chemical polymerization method was utilized to prepare PANI/CuO composites at room temperature, and their sensing characteristics were studied through optical and structural analysis, demonstrating faster response time and suitability for gas sensors.
Review
Materials Science, Multidisciplinary
Raghvendra Singh Yadav, Anju, Ivo Kuritka
Summary: In this article, recent advances on spinel ferrite and MXene-based innovative nanocomposites for electromagnetic interference shielding and microwave absorption are systematically reviewed. The development strategies of nanocomposites with various components are discussed, along with the challenges and future prospects of MXene and spinel ferrite-based nanocomposites. This article lays the foundation for designing an outstanding next-generation electromagnetic wave absorber.
CRITICAL REVIEWS IN SOLID STATE AND MATERIALS SCIENCES
(2022)
Article
Biochemistry & Molecular Biology
Raghvendra Singh Anju, Raghvendra Singh Yadav, Petra Potschke, Juergen Pionteck, Beate Krause, Ivo Kuritka, Jarmila Vilcakova, David Skoda, Pavel Urbanek, Michal Machovsky, Milan Masar, Michal Urbanek
Summary: Nanocomposites consisting of CuxCo1-xFe2O4-rGO-TPU exhibit highly efficient electromagnetic interference shielding, with maximum shielding effectiveness values of 42.9 dB, 46.2 dB, and 58.8 dB. This performance is attributed to good impedance matching, conductivity, dielectric properties, and magnetic loss. These materials are promising candidates for lightweight, flexible, and highly efficient EMI shielding.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Chemistry, Multidisciplinary
Indresh Kumar, Chinky Gangwar, Bushra Yaseen, Pradeep Kumar Pandey, Sheo K. Mishra, Radhey Mohan Naik
Summary: In this study, silver nanoparticles (SNPs) in the size range of 6-10 nm were successfully synthesized using a chemical reduction method. The formation of SNPs was studied spectrophotometrically, and a plausible mechanism for the formation of SNPs colloid was proposed based on experimental findings. SNPs showed remarkable catalytic activity for the reduction of the cationic dye methylene blue.
Article
Crystallography
Ajay Kumar Tiwari, Saket Jha, Abhimanyu Kumar Singh, Sheo Kumar Mishra, Ashok Kumar Pathak, Rudra Prakash Ojha, Raghvendra Singh Yadav, Anupam Dikshit
Summary: Dental caries is a global concern affecting people of all ages. This study synthesized zinc oxide nanoparticles (NPs) as filling agents for tooth decay, using both chemical and biological methods. The results showed that these NPs have inhibitory effects on tooth decay-causing bacteria, and the biologically synthesized NPs are more environmentally friendly and less toxic to human health.
Article
Chemistry, Multidisciplinary
Indresh Kumar, Rashmi Nayak, Lal Babu Chaudhary, Vashist Narayan Pandey, Sheo K. Mishra, Narendra Kumar Singh, Abhishek Srivastava, Surendra Prasad, Radhey Mohan Naik
Summary: In this study, iron nanoparticles in the alpha-Fe2O3 phase were successfully synthesized using L-ascorbic acid as a reducing agent. The synthesized nanoparticles exhibited good morphology and stability, and showed promising biological adaptability against human carcinoma A549 lung cancer cells.
Editorial Material
Biochemistry & Molecular Biology
Raghvendra Singh Yadav
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Editorial Material
Crystallography
Raghvendra Singh Yadav, Anju
Review
Materials Science, Multidisciplinary
Raghvendra Singh Yadav, Ivo Kuritka
Summary: This study discusses the use of carbon nanotube and spinel ferrite-based nanocomposites for effective electromagnetic interference shielding and microwave absorption. The fundamental mechanism of EMI shielding and microwave absorption is described. The research thoroughly examines the EMI shielding and microwave absorption properties of various components such as graphene, MXene, semiconductor nanoparticles, polymer, rubber, etc., and discusses potential problems and solutions for creating new nanocomposites for future shielding applications.
CRITICAL REVIEWS IN SOLID STATE AND MATERIALS SCIENCES
(2023)
Editorial Material
Biochemistry & Molecular Biology
Raghvendra Singh Yadav
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Nanoscience & Nanotechnology
David Skoda, Jarmila Vilcakova, Raghvendra Singh Yadav, Barbora Hanulikova, Tereza Capkova, Marek Jurca, Michal Urbanek, Petr Machac, Lucie Simonikova, Jan Antos, Ivo Kuritka
Summary: Nickel nanoparticle-decorated reduced graphene oxide nanocomposites (NiG) were prepared using a one-step microwave-assisted solvothermal method. NiG nanocomposites were further heated up to 800°C under an inert atmosphere to modify their structural and electromagnetic properties. These NiG nanocomposites were then used as nanofillers in a SEBS polymer matrix to create NiG-800(50)-SEBS and NiG-800(70)-SEBS nanocomposites. The addition of NiG-800 to SEBS resulted in an increase in Young's modulus and high-performance electromagnetic wave absorption.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2023)
Article
Chemistry, Physical
Rajesh Kumar, Sheo K. Mishra
Summary: In this study, dysprosium doped zinc oxide (DZO) nanoluminophores were successfully prepared using a simple, one-step, and mass-scale productive solid-state reaction method. The structural, morphological, and optical properties of the synthesized nanoluminophores were characterized. The results showed that the synthesized rare-earth doped ZnO nanoluminophores have potential applications in optoelectronic devices.
APPLIED SURFACE SCIENCE ADVANCES
(2022)
Proceedings Paper
Materials Science, Multidisciplinary
Sheo K. Mishra, U. K. Tripathi, R. R. Awasthi, K. C. Dubey, R. K. Shukla, Indresh Kumar, Radhey Mohan Naik, D. P. Mishra
Summary: Undoped and Al-doped ZnO nanoplates were synthesized via sol-gel method and characterized for their structural, morphological, and optical properties. The incorporation of Al led to a blue shift in absorption peak and a significant enhancement in photoluminescence intensity. This study demonstrates the potential of Al-doped ZnO nanoplates for optical applications.
MATERIALS TODAY-PROCEEDINGS
(2021)
Proceedings Paper
Materials Science, Multidisciplinary
Sheo K. Mishra, U. K. Tripathi, R. R. Awasthi, R. K. Shukla, Indresh Kumar, Radhey Mohan Naik, D. P. Mishra
Summary: In this study, a series of CTAB-mediated ZnO nanoparticles were synthesized using a solid-state reaction method. The addition of CTAB improved the surface morphology and resulted in enhanced blue-green emission peaks, indicating a good crystalline structure with rarer oxygen vacancies. Structural analysis showed a hexagonal wurtzite crystalline structure for the CTAB-assisted ZnO NPs.
MATERIALS TODAY-PROCEEDINGS
(2021)