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Mediation of Interfacial Mo2C Bridging Effect in MoS2@Carbon Colloid Dots Featuring Improved Photovoltaic Performances of Si-Based Hybrid Solar Cells

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Advanced materials Technologies 2024年第12期9卷

作者： Wei, Ta-Cheng Chen, Shih-Hsiu Lin, Kuan-Han Wu, Tsung-Yen Hsiao, Po-Hsuan Chen, Chia-Yun Department of Materials Science and Engineering National Cheng-Kung University Tainan701 Taiwan Program on Semiconductor Packaging and Testing Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University Tainan70101 Taiwan Research Center National Cheng Kung University No.1 University Road Tainan701 Taiwan

Advances in silicon-based hybrid solar cells with high photovoltaic performance, low synthetic cost, and sound environmental resistance are emerged as potential candidate for solar conversion. Solution-processed few-layer MoS2 sheets are regarded as compelling constitutes that paves ways for tailoring the solar harvesting capability;yet the improvement on charge separation of photoexcited carriers remains demanded, and the lack of environmental stability due to intentionally grabbing electrons from adsorbed moistures constrains the scope of practical assessment. In this work, the employment of MoS2/Mo2C/carbon colloid dots (CCDs) heterostructures within PEDOT:PSS matrix is invoked, where the transfer of photoexcited electrons from MoS2 is mediated with Mo2C electron-transport channels, which further couple out the creation of positive trions by combining with defect-bound excitons at CCD surfaces. These features dynamically involve with slow recombination probability and further improve the photovoltaic gain. Thus, the noticeable improvement of conversion efficiency of 16.1% with 1.6 times of efficiency enhancement outperforming the bare conventional hybrid solar cells is accomplished, and further exhibits a sound long-term stability, which opens new avenues for exploiting the photophysical bound-carrier transition on advanced photovoltaic applications. © 2024 Wiley-VCH GmbH.

关键词： Molybdenum compounds

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Frustrated metastable-to-equilibrium grain boundary structural transition in NbMoTaW due to segregation and chemical complexity

arXiv

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arXiv 2023年

作者： Geiger, Ian Apelian, Diran Pan, Xiaoqing Cao, Penghui Luo, Jian Rupert, Timothy J. Material and Manufacturing Technology University of California IrvineCA92697 United States Department of Materials Science and Engineering University of California IrvineCA92697 United States Department of Physics and Astronomy University of California IrvineCA92697 United States Department of Mechanical and Aerospace Engineering University of California IrvineCA92697 United States Department of NanoEngineering University of California San Diego La Jolla CA92093 United States Program in Materials Science and Engineering University of California San Diego La Jolla CA92093 United States

Grain boundary structural transitions can lead to significant changes in the properties and performance of materials. In multi-principal element alloys, understanding these transitions becomes complex due to phenomena such as local chemical ordering and multi-component segregation. Using atomistic simulations, we explore a metastable-to-equilibrium grain boundary structural transition in NbMoTaW. The transition, characterized by structural disordering and reduced free volume, shows high sensitivity to its local chemical environment. Most notably, the transition temperature range of the alloy is more than twice that of a pure metal. Differences in composition between coexisting metastable and equilibrium structures highlight the change in local site availability due to structural relaxation. Further examination of grain boundaries with fixed chemical states at varying temperatures reveals that the amount of segregation significantly influences the onset temperature yet has minimal effect on the transition width. These insights underscore the profound effect of chemical complexity and ordering on grain boundary transitions in complex concentrated alloys, marking a meaningful advancement in our understanding of grain boundary behavior at the atomic level. Copyright © 2023, The Authors. All rights reserved.

关键词： Grain boundaries

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Transferable screened range-separated hybrid functionals for electronic and optical properties of van der Waals materials

arXiv

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arXiv 2023年

作者： Camarasa-Gómez, María Ramasubramaniam, Ashwin Neaton, Jeffrey B. Kronik, Leeor Department of Molecular Chemistry and Materials Science Weizmann Institute of Science Rehovoth7610001 Israel Department of Mechanical and Industrial Engineering University of Massachusetts Amherst AmherstMA01003 United States Materials Science and Engineering Graduate Program University of Massachusetts Amherst AmherstMA01003 United States Department of Physics University of California BerkeleyCA94720 United States Materials Sciences Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Kavli Energy NanoSciences Institute at Berkeley University of California BerkeleyCA94720 United States

The accurate description of electronic properties and optical absorption spectra is a long-standing challenge for density functional theory. Recently, the introduction of screened range-separated hybrid (SRSH) functionals for solid-state materials has allowed for the calculation of fundamental band gaps and optical absorption spectra that are in very good agreement with many-body perturbation theory. However, since solid-state SRSH functionals are typically tuned to reproduce the properties of bulk phases, their transferability to low-dimensional structures, which experience substantially different screening than in the bulk, remains an open question. In this work, we explore the transferability of SRSH functionals to several prototypical van der Waals materials, including transition-metal sulfides and selenides, indium selenide, black phosphorus, and hexagonal boron nitride. Considering the bulk and a monolayer of these materials as limiting cases, we show that the parameters of the SRSH functional can be determined systematically, using only the band-edge quasiparticle energies of these extremal structural phases as fitting targets. The resulting SRSH functionals can describe both electronic bandstructures and optical absorption spectra with accuracy comparable to more demanding ab initio many-body perturbation theory (GW and Bethe-Salpeter equation) approaches. Selected examples also demonstrate that the SRSH parameters, obtained from the bulk and monolayer reference structures, display good accuracy for bandstructures and optical spectra of bilayers, indicating a degree of transferability that is independent of the fitting procedure. Copyright © 2023, The Authors. All rights reserved.

关键词： Transition metals

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Study of doxorubicin release carried out by pH-responsive chitosan-alginate hydrogels

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Journal of Molecular Liquids 2025年 429卷

作者： Oliveira, Thayane Portela da Silva, Jhaemely Gabrielly Vieira Costa, Paloma Maia de Oliveira, Maykol Christian Damasceno Coelho, Ronaldo Cunha Santos Nascimento, Ariane Maria Silva Silva-Filho, Edson Cavalcanti dos Santos, Francisco Eroni Paz Muniz, Edvani Curti Postgraduate Program in Engineering and Materials Science Federal University of Piauí PI Teresina64049550 Brazil Physics Department Federal University of Piauí PI Teresina64049550 Brazil Department of Teacher Training Instituto Federal do Piauí PI Teresina64053-390 Brazil Chemistry Department Federal University of Piauí PI Teresina64049550 Brazil Chemistry Department State University of Maringá PR Maringá87020-900 Brazil

The use of polysaccharides in drug delivery systems has attracted increasing interest due to their functional properties. Among these, alginate (ALG) and chitosan (CH) are promising candidates for sustained drug delivery as they respond to pH, ensuring that the compound is released in a desired area. In this research physical hydrogels based on alginate and chitosan (ALG/CH) were prepared by varying the synthesis parameters (ALG at ALG/CH ratio, pH and speed stirring) and the effects of such parameters on hydrogels’ chemical and physical structure were accessed through several techniques. Also, the effects synthesis parameters on fractional release (Fmax), half time (t1/2) and percentage encapsulation efficiency (EE%), as the evaluated responses, were statically measured using a factorial design. Analysis through Raman and FTIR spectroscopies revealed the modes and bands corresponding to the precursors, confirming the formation of physically cross-linked hydrogels. The porous structure of the materials was confirmed by scanning electron microscopy (SEM). The swelling capacities of the hydrogels were analyzed at different pHs (5.4 and 7.4) and demonstrated that absorption increases in slightly acidic media. TG/DTG and Micro-CT analyzes of the sample with the greatest swelling showed that the degradation of the hydrogel occurs in two endothermic events and that the material possesses several sized and interconnected pores. The doxorubicin (DOX) release study showed that the release rate is higher as the higher proportion of CH relative to ALG. The factorial design analysis indicated the statistically significant factors in the DOX release tests. Thus, the results suggest that ALG/CH hydrogels can be tuned during their preparation to achieve optimal structure for pH-responsive to be applied for DOX releasing system. © 2025 Elsevier B.V.

关键词： Microgels

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Efficiency Boost of (Ag0.5,Cu0.5)(In1-x,Gax)Se2 Thin Film Solar Cells by Using a Sequential Process: Effects of Ag-Front Grading and Surface Phase engineering

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Advanced Energy materials 2023年第29期13卷

作者： Tu, Lung-Hsin Tran, Ngoc Thanh Thuy Lin, Shih-Kang Lai, Chih-Huang Department of Materials Science and Engineering National Tsing Hua University 101 Sec. 2 Kuang-Fu Road Hsinchu30013 Taiwan Research Center National Cheng Kung University Tainan70101 Taiwan Department of Materials Science and Engineering National Cheng Kung University Tainan70101 Taiwan Program on Smart and Sustainable Manufacturing Academy of Innovative Semiconductor and Sustainable Manufacturing National Cheng Kung University Tainan70101 Taiwan

Post-selenization-fabricated (using elemental Se vapor) Cu(In,Ga)Se2 solar cell efficiency is limited by a low open-circuit voltage, which is attributable to the Ga-deficient surface and insufficient grain growth. In this study, a band-grading structure is demonstrated by combining Ag-front and Ga-back grading in selenized (Ag,Cu)(In,Ga)Se2 (ACIGSe) absorbers with a properly designed precursor structure (Mo/CuGa/In/AgGa) and high Ag content ([Ag]/([Ag]+[Cu]) = 0.5). The phase evolution during post-selenization reveals that the precursor structure suppresses Ag2Se formation and promotes the ACIGSe phase formed at a low temperature with enhanced grain growth. A widened surface bandgap by Ag-front grading substantially increases the open-circuit voltage. Furthermore, Ag addition promotes ordered vacancy compound (OVC) formation on the front surface to enlarge the valence band offset, which in turn reduces interface recombination. Furthermore, the OVC phase also assists interface passivation. Promoting surface OVC phase by Ag addition is also validated by first-principles calculations. Furthermore, the K-doped CuGa precursor is used for a ACIGSe absorber to address the significantly reduced carrier density by the Ag addition. With a band-grading structure and surface OVC phase, the superior device achieves an efficiency of > 19%, the highest efficiency by post-selenization with an elemental Se source. © 2023 Wiley-VCH GmbH.

关键词： Grading

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Naked-eye observation of water-forming reaction on palladium etalon:transduction of gas-matter reaction into light-matter interaction

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PhotoniX 2023年第1期4卷 349-363页

作者： Jongsu Lee Eui-Sang Yu Taehyun Kim In Soo Kim Seok Chung Seung Jae Kwak Won Bo Lee Yusin Pak Yong-Sang Ryu Sensor System Research Center Korea Institute of Science and TechnologySeoul 02792Republic of Korea Department of Electrical and Computer Engineering Seoul National UniversitySeoul 08826Republic of Korea Smart Materials Research Section Electronics and Telecommunications Research InstituteDaejeon 34129Republic of Korea Department of Micro/Nano Systems Korea University02841 SeoulRepublic of Korea Nanophotonics Research Center Korea Institute of Science and TechnologySeoul 02792Republic of Korea School of Mechanical Engineering Korea UniversitySeoul 02841Republic of Korea School of Chemical and Biological Engineering Seoul National UniversitySeoul 08826Republic of Korea Interdisciplinary Program in Precision Public Health Korea UniversitySeoul 02481Republic of Korea School of Biomedical Engineering Korea UniversitySeoul 02481Republic of Korea

Palladium is the most prominent material in both scientific and industrial research on gas storage,purification,detection,and catalysis due to its unique properties as a catalyst and hydrogen *** the dynamic optical phenomena of palladium reacting with hydrogen,transduction of the gas-matter reaction into light-matter interaction is attempted to visualize the dynamic surface chemistry and reaction *** simple geometry of the metal-dielectric-metal structure,Fabry-Perot etalon,is employed for a colorimetric reactor,to display the catalytic reaction of the exposed gas via water-film/bubble formation at the dielectric/palladium *** adsorption/desorption behavior and catalytic reaction of hydrogen and oxygen on the palladium surface display highly repeatable and dramatic color changes based on two distinct water formation trends:the foggy effect by water bubbles and the whiteout effect by water film *** and experiments demonstrate the robustness of the proposed Fabry-Perot etalon as an excellent platform for monitoring the opto-physical phenomena driven by heterogeneous catalysis.

关键词： Palladium Hydrogen Oxygen Fabry-Perot resonators Colorimetric sensors Water-forming reaction

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Leveraging Optical Anisotropy of the Morpho Butterfly Wing for Quantitative, Stain-Free, and Contact-Free Assessment of Biological Tissue Microstructures

arXiv

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arXiv 2024年

作者： Kirya, Paula Mestre-Farrera, Aida Yang, Jing Poulikakos, Lisa V. Department of Mechanical and Aerospace Engineering Program of Materials Science and Engineering UC San Diego 9500 Gilman Drive La Jolla CA92093 United States Department of Pharmacology Moores Cancer Center UC San Diego 3855 Health Sciences Drive La Jolla CA92093 United States Department of Pediatrics UC San Diego 9500 Gilman Drive La Jolla CA92093 United States

Changes in the density and organization of fibrous biological tissues often accompany the progression of serious diseases ranging from fibrosis to neurodegenerative diseases, heart disease and cancer. However, challenges in cost, complexity, or precision faced by existing imaging methodologies pose barriers to elucidating the role of tissue microstructure in disease. Here, we leverage the intrinsic optical anisotropy of the Morpho butterfly wing and introduce Morpho-Enhanced Polarized Light Microscopy (MorE-PoL), a stain- and contact-free imaging platform which enhances and quantifies the birefringent material properties of fibrous biological tissues. We develop a mathematical model, based on Jones calculus, which quantifies fibrous tissue density and organization. As a representative example, we analyze collagen-dense and collagen-sparse human breast cancer tissue sections and leverage our technique to assess the microstructural properties of distinct regions of interest. We compare our results with conventional Hematoxylin and Eosin (H&E) staining procedures and second harmonic generation (SHG) microscopy for fibrillar collagen detection. Our findings demonstrate that our MorE-PoL technique provides a robust, quantitative, and accessible route toward analyzing biological tissue microstructures, with great potential for application to a broad range of biological materials. Copyright © 2024, The Authors. All rights reserved.

关键词： Collagen

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Antibacterial evaluation of radiolytically synthesized silver nanoparticles with ι-carrageenan stabilizers

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Radiation Physics and Chemistry 2025年 236卷

作者： Gili, Mon Bryan Z. Manuel, Wendell A. Guillermo, Neil Raymund D. Shankaregowda, Rakshith Gowda H. Phan, Manh-Huong Conato, Marlon T. Vega, Marienette M. Department of Science and Technology Philippine Nuclear Research Institute Commonwealth Avenue Diliman Quezon City1101 Philippines Materials Science and Engineering Program College of Science University of the Philippines Diliman Diliman Quezon City1101 Philippines Department of Physics University of South Florida 4202 East Fowler Avenue TampaFL33620 United States Institute of Chemistry College of Science University of the Philippines Diliman Diliman Quezon City1101 Philippines

The synthesis of silver nanoparticles (AgNPs) using green, eco-friendly methods has garnered significant attention due to the potential advantages of using natural polymers, such as ι-carrageenan, as stabilizing agents. However, challenges remain in controlling the size, distribution, and stability of the nanoparticles, as well as optimizing their antimicrobial activity. In this study, gamma irradiation of ι-carrageenan solutions was investigated as a method for synthesizing AgNPs and exploring their antimicrobial properties. The primary objective was to assess how varying radiation doses and ι-carrageenan concentrations affect the formation, size distribution, and antimicrobial activity of the AgNPs. ι-Carrageenan solutions (0.1, 0.5, and 1.0 w/v %) were mixed with 0.2 M silver nitrate (AgNO3) solutions and irradiated at doses ranging from 0 to 20 kGy using Co-60. UV–vis spectroscopic analysis indicated the successful formation of AgNPs, with surface plasmon resonance (SPR) peaks appearing between 402 and 418 nm. These peaks shifted slightly towards shorter wavelengths as the irradiation rose, signaling a reduction in nanoparticle size. The optimal synthesis of AgNPs occurred at 0.5 % ι-carrageenan concentration and a dose of 15 kGy, where the SPR peak intensity and nanoparticle formation were most pronounced. XRD confirmed the presence of silver nanoparticles with face-centered cubic (FCC) structure. Particle size analysis, using dynamic light scattering (DLS), revealed that AgNPs ranged in size from 85 to 142 nm, with smaller particles forming at higher doses. At a 1 kGy dose, the nanoparticle size averaged 114 nm, but increased doses (15–20 kGy) led to a significant reduction in particle size to 85 nm. This size reduction was attributed to the fragmentation of larger particles as the irradiation dose increased. Fourier-transform infrared (FTIR) spectroscopy showed notable changes in the ι-carrageenan structure, with the formation of new functional groups, includ

关键词： Fourier transform infrared spectroscopy

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Development of Intelligent Electronic Nose for Livestock Industries 7

Development of Intelligent Electronic Nose for Livestock Ind...

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7th International Conference on engineering, Applied sciences and Technology, ICEAST 2021

作者： Aunsa-Ard, Wandee Pobkrut, Theerapat Kerdcharoen, Teerakiat Siyang, Satetha Prombaingoen, Nathamanee Mahidol University Materials Science and Engineering Program Faculty of Science Bangkok10400 Thailand Mahidol University and Research Network of NANOTEC at Mahidol University Faculty of Science National Nanotechnology Center Bangkok10400 Thailand Ministry of Agriculture and Cooperatives Department of Livestock Bangkok10400 Thailand

ISBN: (纸本)9781665441223

This paper describes the development and application of our electronic nose (e-nose) machine and algorithms for monitoring of malodor emission. Malodor emission from livestock farms have been known as a significant source of odor nuisance resulting in increased complaints and environmental issues. E-nose technology has provided solutions to variety of these odorous problems with identification of the odor source and real-time monitoring of odor diffusion into the environment. This lab-developed electronic nose system consists of eight metal oxide semiconductor (MOX) gas sensors as sensing materials, including a humidity sensor and a temperature sensor. The gas sensors were specifically selected for the main volatile compounds emitted from the livestock farms. Principal Component Analysis (PCA) was used as classification algorithms combined with data analysis techniques, which enable the recognition of different odor samples. In this work, five commercial poultry farms were selected for odor monitoring using the in-lab developed e-nose machine. The field experiments were conducted at various sites in the farms such as chicken houses, manure storage, biogas facilities, downwind points and in nearby villages. Odor concentrations were mainly detected behind the poultry house fan (Max. 11 odor unit). In addition, the malodor sources have been investigated with the e-nose in each poultry farm. High concentrations of malodor were identified in the poultry farms with poor manure handling system and poor building management. In conclusion, the e-nose technology has the potential of providing monitoring capabilities for livestock and agricultural industries. The use of e-nose device is recommended to apply in the livestock farms to reduce neighbourhood complaints and risk on workers' health and safety. © 2021 IEEE.

关键词： Electronic nose

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Facile synthesis of metal-polyphenol-formaldehyde coordination polymer colloidal nanoparticles with sub-50 nm for T_(1)-weighted magnetic resonance imaging

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Chinese Chemical Letters 2021年第2期32卷 842-848页

作者： Jing Qin Guohai Liang Bingxi Feng Gen Wang Na Wu Yonghui Deng Ahmed AElzatahry Abdulaziz Alghamdi Yongxi Zhao Jing Wei The Key Laboratory of Biomedical Information Engineering of Ministry of Education School of Life Science and TechnologyXi'an Jiaotong UniversityXi'an 710049China College of Biophotonics South China Normal UniversityGuangzhou 510631China Department of Chemistry Fudan UniversityShanghai 200433China Materials Science and Technology Program College of Arts and SciencesQatar UniversityPO Box 2713DohaQatar Department of Chemistry College of ScienceKing Saud UniversityP.O.Box 2455Riyadh 11451Saudi Arabia

Plant polyphenol-based coordination polymers(CPs) with ultra-small particle size and tailorable compositions are highly desired in biomedical applicatio ns,but their synthesis is still challenging due to the sophisticated coordination assembly process and unavoidable self-oxidation polymerization of polyphenol. He rein,a general ligand covalent-modification mediated coordination assembly strategy is proposed for the synthesis of water-dispersible CPs with tunable metal species(e.g., Gd,Cu,Ni,Zn,Fe)and ultra-small diameter(8.6-37.8 nm) using nontoxic plant polyphenol(e.g..tannic acid,gallic acid) as a polymerizable *** molecules react with formaldehyde firstly,which can effectively retard the oxidation induced self-polymerization of polyphenol and lead to the formation of metal ions containing CPs colloidal *** ultrafine nanoparticles with stably chelated metal io ns are highly water dispersible and thus advantageous for *** an example,ultra-small Gd contained CPs exhibit higher longitudinal relaxivity(r_(1)=25.5 L mmol^(-1) s^(-1)) value with low r2/r1(1.19) than clinically used Magnevist(Gd-DTPA,r1=3.7 L mmol^(-1) s^(-1)) .Due to the enhanced permeability and retention effect,they can be further used as a positive contrast agent for T1-weighted MR imaging of tumour.

关键词： Coordination polymer Nanoparticle Self-assembly Plant polyphenol Contrast agent

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