المؤلفون: Liu, Yuanyue¹ yuanyue.liu.microman@gmail.com, Stradins, Pauls¹, Wei, Su ‐ Huai^1,2 suhuaiwei@csrc.ac.cn

المصدر: Angewandte Chemie. 1/18/2016, Vol. 128 Issue 3, p977-980. 4p.

مصطلحات موضوعية: *PASSIVATION, *CHALCOGENS, *SEMICONDUCTORS, *COMPUTATIONAL chemistry, *NANOTECHNOLOGY

مستخلص: Defects play important roles in semiconductors (SCs). Unlike those in bulk SCs, defects in two-dimensional (2D) SCs are exposed to the surrounding environment, which can potentially modify their properties/functions. Air is a common environment, yet its impact on the defects in 2D SCs still remains elusive. Here we study the interaction between air and chalcogen vacancies (VX), the most typical defects in 2D SCs. Although the interaction is weak for most molecules in air, O2 can be chemisorbed at VX with a barrier that correlates with the SC cohesive energy and can be overcome even at room temperature for certain SCs. Importantly, the chemisorbed O2 changes the VX from commonly believed harmful carrier-traps to electronically benign sites. This unusual behavior originates from the isovalence between O2 and X when bonded with metal. Based on these findings, af acile approach is proposed to improve the performance of 2D SCs by using air/O2 to passivate the defects. [ABSTRACT FROM AUTHOR]

المؤلفون: Saif M. H. Qaid, Hamid M. Ghaithan, Bandar Ali Al‐Asbahi, Abdullah S. Aldwayyan

مصطلحات موضوعية: Perovskite Solar Cell Technology, Electrical and Electronic Engineering, FOS Electrical engineering, electronic engineering, information engineering, Engineering, Physical Sciences, Applications of Quantum Dots in Nanotechnology, Materials Chemistry, Materials Science, Laser Cooling of Solids to Cryogenic Temperatures, Atomic and Molecular Physics, and Optics, Physics and Astronomy, Perovskite Solar Cells, Passivation, Materials science, Perovskite structure, Thin film, Evaporation, Photoluminescence, Layer electronics, Nucleation, Chemical engineering, FOS Chemical engineering, Crystallization, Composite material, Optoelectronics, Nanotechnology, FOS Nanotechnology, Chemistry, Organic chemistry, Physics

الوصف: High-quality inorganic cesium lead halide perovskite CsPb(Br0.5Cl0.5)3 thin films were successfully achieved through evaporation of the precursors and deposition sequentially by a single-source thermal evaporation system. The different melting points of the precursors were enabled us to evaporate precursors one by one in one trip. The resulting films through its fabrication were smooth and pinhole-free. Furthermore, this technique enabled complete surface coverage by high-quality perovskite crystallization and more moisture stability oppositely of that produce by solution-processed. Then the perovskite films were encapsulated by evaporated a polymethyl methacrylate (PMMA) polymer as a specialized surface passivation approach with various thicknesses. The blue emission, high photoluminescence quantum yield (PLQY), stable, and low threshold of amplified spontaneous emission (ASE) properties of CsPb(Br0.5Cl0.5)3 films in the bulk structure at room temperature were achieved. The effects of the ... : تم تحقيق 3 أغشية رقيقة عالية الجودة من رصاص السيزيوم غير العضوي بيروفسكايت CsPb (Br0.5Cl0.5) بنجاح من خلال تبخير السلائف والترسيب بالتتابع بواسطة نظام تبخير حراري أحادي المصدر. مكنتنا نقاط الانصهار المختلفة للسلائف من تبخر السلائف واحدة تلو الأخرى في رحلة واحدة. كانت الأفلام الناتجة من خلال تصنيعها سلسة وخالية من الثقوب. علاوة على ذلك، مكنت هذه التقنية من تغطية السطح بالكامل من خلال تبلور البيروفسكايت عالي الجودة والمزيد من استقرار الرطوبة بشكل معاكس لتلك التي تنتجها المعالجة بالمحلول. ثم تم تغليف أغشية البيروفسكايت بواسطة بوليمر بولي ميثيل ميثاكريلات (PMMA) المتبخر كنهج تخميل سطحي متخصص بسماكات مختلفة. تم تحقيق الانبعاثات الزرقاء، وارتفاع العائد الكمومي للتلألؤ الضوئي (PLQY)، ومستقرة، وعتبة منخفضة من خصائص الانبعاثات التلقائية المضخمة (ASE) من CsPb (Br0.5Cl0.5)3 أفلام في البنية السائبة في درجة حرارة الغرفة. تم فحص تأثيرات طبقة التخميل السطحي وسمكها على الاستجابة البصرية. تم إجراء تحليل مفصل لاعتماد خصائص بورصة عمان على سمك طبقة التخميل السطحي، وتم تحديد أن هذا يحقق تحسين الأداء. تأثرت خصائص بورصة عمان ...

العلاقة: https://dx.doi.org/10.60692/28dgb-89215Test

الإتاحة: https://doi.org/10.60692/hpxf3-47z4410.60692/28dgb-89215Test

المصدر: Drug Week; 12/29/2023, p2064-2064, 1p

مصطلحات موضوعية: RESEARCH personnel, NANOSTRUCTURED materials, FULLERENES, METHICILLIN-resistant staphylococcus aureus, PASSIVATION

مصطلحات جغرافية: HEFEI Shi (China), ASIA

مستخلص: Researchers at the University of Science and Technology China have developed a new method to enhance the antimicrobial properties of black phosphorus nanosheets (BPNSs) using fullerene C70. BPNSs have emerged as potential non-antibiotic antimicrobial agents, but their limited stability and antibacterial activity have hindered their widespread use. By covalently passivating BPNSs with fullerene C70, the researchers were able to overcome these challenges and significantly enhance the antibacterial performance of the nanosheets. The improved antimicrobial properties were attributed to the increased generation of reactive oxygen species, resulting in boosted efficacy against methicillin-resistant Staphylococcus aureus (MRSA). [Extracted from the article]

: Copyright of Drug Week is the property of NewsRx and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

المؤلفون: Kristopher O. Davis, Pieter G. Kik, Mengdi Sun, Gregory S. Doerk, Mohammad Jobayer Hossain

المصدر: Nanophotonics, Vol 10, Iss 18, Pp 4611-4621 (2021)

مصطلحات موضوعية: Materials science, Nanostructure, Passivation, Silicon, QC1-999, chemistry.chemical_element, Nanotechnology, Self assembled, Atomic layer deposition, Photovoltaics, nanostructures, Electrical and Electronic Engineering, surface passivation, business.industry, Physics, Photon management, photon management, self-assembly, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, chemistry, atomic layer deposition, solar cells, multifunctional materials, Self-assembly, business, Biotechnology

الوصف: This work reports the fabrication and characterization of multifunctional, nanostructured passivation layers formed using a self-assembly process that provide both surface passivation and improved light trapping in crystalline silicon photovoltaic (PV) cells. Scalable block copolymer self-assembly and vapor phase infiltration processes are used to form arrays of aluminum oxide nanostructures (Al2O3) on crystalline silicon without substrate etching. The Al2O3 nanostructures are characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), and spectroscopic ellipsometry. Injection-level dependent photoconductance measurements are used to determine the effective carrier lifetime of the samples to confirm the nanostructures successfully passivate the Si surface. Finite element method simulations and reflectance measurement show that the nanostructures increase the internal rear reflectance of the PV cell by suppressing the parasitic optical losses in the metal contact. An optimized morphology of the structures is identified for their potential use in PV cells as multifunctional materials providing surface passivation, photon management, and carrier transport pathways.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ffa10c7a6efb11c65b60dc6b38f31010Test
https://doi.org/10.1515/nanoph-2021-0472Test

المؤلفون: Bae, S., Collins, R.N., Waite, T.D., Hanna, K.

المساهمون: Konkuk University Seoul, University of New South Wales Sydney (UNSW), Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie - CNRS Chimie (INC-CNRS)-Centre National de la Recherche Scientifique (CNRS), Campus France, NRF-2017K1A3A1A21013653, National Research Foundation of Korea

المصدر: ISSN: 0013-936X.

مصطلحات موضوعية: Byproducts, Chemicals removal (water treatment), Groundwater, Impurities, Iron, Nanotechnology, Oxidation, Redox reactions, Remediation, Wastewater treatment, Contaminant degradation, Corrosion phenomena, Nanoscale zero-valent iron, Oxidative transformations, Positive and negative effect, State-of-the-art techniques, Surface passivation, Synthesis procedure, Passivation, [CHIM]Chemical Sciences, [CHIM.MATE]Chemical Sciences/Material chemistry

الوصف: International audience ; Nanoscale zerovalent iron (NZVI) is one of the most extensively studied nanomaterials in the fields of wastewater treatment and remediation of soil and groundwater. However, rapid oxidative transformations of NZVI can result in reduced NZVI reactivity. Indeed, the surface passivation of NZVI is considered one of the most challenging aspects in successfully applying NZVI to contaminant degradation. The oxidation of NZVI can lead to the formation of FeII-bearing phases (e.g., FeIIO, FeII(OH)2, FeIIFeIII 2O4) on the NZVI surface or complete oxidation to ferric (oxyhydr)oxides (e.g., FeIIIOOH). This corrosion phenomenon is dependent upon various factors including the composition of NZVI itself, the type and concentration of aqueous species, reaction time and oxic/anoxic environments. As such, the coexistence of different Fe oxidation states on NZVI surfaces may also, in some instances, provide a unique reactive microenvironment to promote the adsorption of contaminants and their subsequent transformation via redox reactions. Thus, an understanding of passivation chemistry, and its related mechanisms, is essential not only for effective NZVI application but also for accurately assessing the positive and negative effects of NZVI surface passivation. The aim of this review is to discuss the nature of the passivation processes that occur and the passivation byproducts that form in various environments. In particular, the review presents (i) the strengths and limitations of state-of-the-art techniques (e.g., electron microscopies and X-ray-based spectroscopies) to identify passivation byproducts; (ii) the passivation mechanisms proposed to occur in anoxic and oxic environments; and (iii) the effects arising from synthesis procedures and the presence of inorganics/organics on the nature of the passivation byproducts that form. In addition, several depassivation strategies that may assist in increasing and/or maintaining the reactivity of NZVI are considered, thereby enhancing the effectiveness of ...

العلاقة: info:eu-repo/semantics/altIdentifier/pmid/30277777; hal-01939031; https://univ-rennes.hal.science/hal-01939031Test; https://univ-rennes.hal.science/hal-01939031/documentTest; https://univ-rennes.hal.science/hal-01939031/file/Bae%20et%20al_2018_Advances%20in%20surface%20passivation%20of%20nanoscale%20zerovalent%20iron%20%28NZVI%29.pdfTest; PUBMED: 30277777

الإتاحة: https://doi.org/10.1021/acs.est.8b01734Test
https://univ-rennes.hal.science/hal-01939031Test
https://univ-rennes.hal.science/hal-01939031/documentTest
https://univ-rennes.hal.science/hal-01939031/file/Bae%20et%20al_2018_Advances%20in%20surface%20passivation%20of%20nanoscale%20zerovalent%20iron%20%28NZVI%29.pdfTest

المؤلفون: Peng Zhang, Liang Li, Fengren Cao

المصدر: Fundamental Research. 2:237-253

مصطلحات موضوعية: Materials science, Passivation, Ion migration, Energy conversion efficiency, Thermal, Nanotechnology, Perovskite (structure)

الوصف: Organic-inorganic hybrid perovskite solar cells (PSCs) have attracted extensive attention, and their certified power conversion efficiency (PCE) has reached 25.5%. However, the instability of the high-efficiency 3-dimensional (3D) perovskite against ambient conditions (moisture, light and thermal) and the existing defects severely limit its practical applications and commercialization. Unlike 3D perovskites, the large hydrophobic spacer cations in low-dimensional (2D, 1D, and 0D) perovskites are able to effectively improve the stability, but they also weaken the light absorption range and hinder charge transport. The construction of a low-dimensional/3D perovskite multidimensional structure, which can combine the advantages of the high stability of low-dimensional perovskites and the superior efficiency of 3D perovskites, is proposed to achieve high efficiency and ultrastability. Moreover, the proper incorporation of low-dimensional perovskite into 3D perovskite can passivate defects and inhibit ion migration. Herein, this article summarizes the recent research progress of low-dimensional/3D perovskite multidimensional structures for PSCs and provides some perspectives toward developing stable and efficient PSCs.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::d915436085b33002517d85ca30361951Test
https://doi.org/10.1016/j.fmre.2021.07.003Test

المؤلفون: Anurag, Ashay

مصطلحات موضوعية: Nanoscience, Nanotechnology, Hafnium Oxide, Passivation, Selevtive ALD, Self Assembled Monolayer

الوصف: As the scaling of nanoelectronic features continues well below the 5 nm node, conventional patterning mechanism like lithography and etching are unable to create aligned features with low margin errors and low line edge roughness. Atomic layer deposition (ALD) and chemical vapor deposition (CVD) help overcome this challenge. However, ALD typically leads to conformal deposition over the entire surface, without any control on the lateral arrangement of the atoms .Self-assembled monolayers (SAMs) can be used to locally deactivate the ALD growth if they can be selectively deposited. A critical issue with SAMS is that they are typically applied by using wet chemistry and are composed of long chain molecules (1-2nm) which require long deposition times to get molecular alignment which is needed for effective passivation.This work reports effective vapor phase passivants for the application of self-assembled monolayers of small molecules to deactivate the selected ALD growth area. The passivants used are smaller than 1nm in length, create a film with RMS roughness of less than 5 Angstrom, and require low processing temperatures. Using one such passivant, [tetramethyldisilazane (TMDS)], up to 12nm of HfOx was deposited on Si without any deposition on passivated SiCOH and SiO2. Deposition of metals like cobalt was also investigated by ALD. Contact angle was used to characterize the hydrophobicity of the surface, the surface topology was examined by atomic force microscopy (AFM) and the metal/metal oxide growth was characterized by x-ray photoelectron spectroscopy (XPS).

وصف الملف: application/pdf

الوصول الحر: https://escholarship.org/uc/item/3g7935cjTest

المؤلفون: Zhongwang Wang, Xiaochi Liu, Rongqi Wu, Junqiang Yang, Yuchuan Pan, Jian Sun, Qianli Dong, Yaqi Shen, Wei Zhou, Song Liu, Kui Tang, Yuanyuan Jin, Xianfu Dai

المصدر: Chinese Chemical Letters. 33:177-185

مصطلحات موضوعية: Materials science, Semiconductor, Passivation, Transition metal, Graphene, law, business.industry, Nanotechnology, General Chemistry, business, Black phosphorus, law.invention

الوصف: Since the discovery of graphene, two-dimensional (2D) semiconductors have been attracted intensive interest due to their unique properties. They have exhibited potential applications in next generation electronic and optoelectronic devices. However, most of the 2D semiconductor are known to suffer from the ambient oxidation which degrade the materials and therefore hinder us from the intrinsic materials’ properties and the optimized performance of devices. In this review, we summarize the recent progress on both fundamentals and applications of the oxidations of 2D semiconductors. We begin with the oxidation mechanisms in black phosphorus, transition metal dichalcogenides and transition metal monochalcogenides considering the factors such as oxygen, water, and light. Then we show the commonly employed passivation techniques. In the end, the emerging applications utilizing controlled oxidations will be introduced.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::436a4d46e5ff777e04cf09ebc9bf12dfTest
https://doi.org/10.1016/j.cclet.2021.06.078Test

المؤلفون: Toru Fukuma, Shogo Himori, Shoichi Nishitani, Toshiya Sakata, Reiko Shiratori, Youyuan Man

المصدر: Langmuir. 37:14369-14379

مصطلحات موضوعية: Materials science, Passivation, Aryl, Nanotechnology, Surfaces and Interfaces, Condensed Matter Physics, Electrochemistry, Grafting, chemistry.chemical_compound, chemistry, Covalent bond, Surface modification, General Materials Science, Nanometre, Thin film, Spectroscopy

الوصف: Aryl diazonium chemistry generates a covalently attached thin film on various materials. This chemistry has diverse applications owing to the stability, ease of functionalization, and versatility of the film. However, the uncontrolled growth into a polyaryl film has limited the controllability of the film's beneficial properties. In this study, we developed a multistep grafting protocol to densify the film while maintaining a thickness on the order of nanometers. This simple protocol enabled the full passivation of a nitrophenyl polyaryl film, completely eliminating the electrochemical reactions at the surface. We then applied this protocol to the grafting of phenylphosphorylcholine films, with which the densification significantly enhanced the antifouling property of the film. Together with its potential to precisely control the density of functionalized surfaces, we believe this grafting procedure will have applications in the development of bioelectrical interfaces.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::827d5a51b6aa6cf367d8f5535ed7dfc5Test
https://doi.org/10.1021/acs.langmuir.1c02291Test

المؤلفون: Fang Shen, Xingfa Chen, Zhenrui Wu, Renshu Huang, Shibin Yin, Jian Liu, Jia Wu, Huibing He, Hongyu Qin, Guoning Chen

المصدر: Energy Storage Materials. 43:317-336

مصطلحات موضوعية: Materials science, Passivation, Renewable Energy, Sustainability and the Environment, Galvanic anode, Energy Engineering and Power Technology, chemistry.chemical_element, Nanotechnology, Zinc, engineering.material, Surface engineering, Energy storage, Anode, Coating, chemistry, Plating, engineering, General Materials Science

الوصف: Rechargeable aqueous zinc-ion batteries (ZIBs) have attracted increasing attention as promising energy storage devices in large-scale energy storage systems due to their low cost, high capacity, and inherent safety. However, the poor reversibility of zinc anodes has largely restricted their further development because of the dendrite growth, surface passivation, and hydrogen evolution problems associated with Zn metal anodes during the repeated plating/stripping cycles. Surface engineering with functional protection layer appears to be an effective means to mitigate Zn dendrite issues. We first introduce zinc electrochemistry in mild/neutral environments and elaborate Zn anode degradation mechanism. Then, we give state-of-the-art research progress and provide a specific, comprehensive, and in-depth summary of the mechanisms of different coating materials, and share some examples of advanced characterizations for an in-depth understanding on the working mechanisms of the coating layers. Finally, we propose a design principle for the structural design of an ideal interface layer on the Zn metal and share perspectives. This review would give rise to a broad interest focusing on commercial Zn foils in the community of ZIBs, bring potential ideas and inspiration in surface engineering strategies for the rational design of dendrite-free Zn anodes, and boost the development of advanced aqueous ZIBs with low cost and inherent safety.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::2e165a6e31149ea7b88a7e3e932bffc5Test
https://doi.org/10.1016/j.ensm.2021.09.012Test