Nanotechnology最新文献

{"title":"Micron Size Graphene Sheets Synthesis by Methane Pyrolysis in an RF-ICP Thermal Plasma Reactor.","authors":"Reem Mahmoud, François Gitzhofer, Nicolas Abatzoglou","doi":"10.1088/1361-6528/adc555","DOIUrl":"https://doi.org/10.1088/1361-6528/adc555","url":null,"abstract":"<p><p>Bottom-up synthesis of free-standing graphene using thermal plasma technology often results in flakes with smaller lateral dimensions (hundreds of nanometers) compared to top-down and substrate-based approaches (reaching centimeters in size) [1]. This limitation in size restricts the applicability of graphene in various applications. This study investigates a method to overcome this limitation by studying the reactor's quenching effect on the plasma plume exiting an RF-ICP thermal plasma torch. Local gas phase chemistry and graphene morphology were investigated during methane (CH4) pyrolysis in argon plasma. Natural quenching suppression led to a production of few-layer (2-5 layers), near-micrometer-sized un-supported graphene sheets (~2.8µm perimeter) with less crumpling and a projected area of (2-5)×105 nm². Raman, TEM, TGA, and XPS analysis confirmed the high quality of the synthesized graphene. Sp2 carbon composition in the sample was calculated using the D parameter obtained from the differentiated C KLL Auger peak in the XPS spectrum. A correlation between the gas phase chemistry and the graphene morphology demonstrated the significant effect of plasma reactor natural quenching and recirculation on the graphene synthesis and offers a potential for controlling the structure of unsupported graphene. The current study provides valuable insights that can pave the way for the development of reactors with a definite control over the morphology of synthesized graphene.&#xD.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143710654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Significantly boosted photocatalytic hydrogen evolution by Pd-TiO2/ZnIn2S4 nanowires heterojunction under simulated sunlight.","authors":"Mingming Du, Zheng Fang, Hongyue Liu, Qiyun Li, Anxian Peng, Huimei Chen, Yitong Liu, Jinwen Zhan, Rongjun Yan","doi":"10.1088/1361-6528/adc554","DOIUrl":"https://doi.org/10.1088/1361-6528/adc554","url":null,"abstract":"<p><p>In this work, Pd-TiO2/ZnIn2S4 nanowires (Pd-Ti-Nws/ZIS) heterostructures catalysts were prepared and applied to photocatalytic hydrogen evolution under simulated sunlight. The results revealed that the hydrogen production rate of Pd-Ti-Nws-40/ZIS was as high as 66.62 mmol·g-1·h-1, which was 20.5 and 418 times as much as that of pure ZIS and Pd-Ti-Nws, respectively. After 5 cycles, the hydrogen production of the photocatalyst can still reach about 60 mmol within 120 min. According to the results of photochemistry and XPS, Pd-Ti-Nws/ZIS meets the S-scheme heterojunction system, which is beneficial to inhibit the recombination of photogenerated holes and electrons and increase carrier transport rate through the S-scheme heterojunction. Under light radiation, Pd-Ti-Nws is positively charged due to the accumulation of holes, and ZIS is negatively charged due to the accumulation of electrons with higher reducing power. Moreover, Pd nanoparticles obviously improve the response range and intensity of the catalyst to sunlight. Therefore, the photocatalytic hydrogen production rate obviously increased. This work provides a reasonable method for designing efficient catalysts for photocatalytic hydrogen production.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143710660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bi4Ti3O12 nanosheets loaded with Rh as special cocatalysts enhancing visible-light driven water splitting activity of ZnIn2S4 nanosheets.","authors":"Chen Zhang, Ruipeng Hou, Shufang Chang, Rong Wu, Shunhang Wei","doi":"10.1088/1361-6528/adc4ee","DOIUrl":"https://doi.org/10.1088/1361-6528/adc4ee","url":null,"abstract":"<p><p>Cocatalysts generally serve as active sites accelerating carrier separation. However, when the hydrophilicity of photocatalyst itself is poor, the trapped electrons or holes on cocatalysts are difficult to react with reactants quickly. In this work, Bi4Ti3O12 nanosheets with excellent hydrophilicity was prepared and then thermally deposited Rh on their surface (Bi4Ti3O12(Rh)), and finally in-suit grew ZnIn2S4 on the surface of Bi4Ti3O12(Rh). Based on the results of photocatalytic performance and materials characterization, it was found that the Bi4Ti3O12(Rh) in the photocatalytic system could be considered as a special cocatalyst rather than formed heterojunction with the ZnIn2S4. Under visible-light irradiation, the Rh acted as an electron trapping site to conduct photogenerated electrons trapping from ZnIn2S4 to the surface of Bi4Ti3O12. This process not only further accelerated carrier separation, but also facilitated electrons reacting with water due to the excellent hydrophilicity of Bi4Ti3O12(Rh), thereby achieving enhanced photocatalytic H2 production performance in the absence of sacrificial agents.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143710313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis and characterization of piroxicam and M (M= Pd (II), Ag (I)) complex nanoconjugates with orange quantum dots for enhanced antimicrobial and anticancer activity.","authors":"Ahmed M Kamal El-Sagheir, Aya M Soliman, Alaa Elsaghir, Momen M Thabet, Ahmed Faried Abdel Hakiem, Ahmed S Aboraia","doi":"10.1088/1361-6528/adc4eb","DOIUrl":"https://doi.org/10.1088/1361-6528/adc4eb","url":null,"abstract":"<p><p>Conjugation and loading of piroxicam and its metal complexes; Palladium(II) (PdL2) and Silver(I) (AgL) synthesized and characterized by different techniques including IR, UV-Vis spectroscopy, spectrofluorimetry, TEM, XRPD and Zeta potential analyses were achieved. OQDs nanoparticle showed good stability, encapsulation and loading efficiency and controlled release of loaded piroxicam and its metal complexes. Generally, new OQQs conjugates showed enhanced antimicrobial and anticancer activity. In vitro antimicrobial activity screening demonstrated that Ag(I)-OQDs conjugate displayed potent antibacterial effect that was 1.8-fold against E. coli higher than piroxicam (MIC= 31.85 µM), where Pd(II)-OQDs conjugate depicted the highest activity with MIC of 33.05 µM against P. aeruginosa. In case of G+ve bacteria, Ag conjugate had potent activity which was 2.3-fold on S. aureus higher than piroxicam (MIC= 43.12 µM), while Pd conjugate exerted promising activity that was 3.5-fold against E. faecalis higher than piroxicam (MIC= 74.57 µM). Ag conjugate showed the most promising antifungal activity with 2.5-folds more than piroxicam. The in vitro antiproliferative activity depicted that all synthesized conjugates showed better Cytotoxic effect than piroxicam, specifically Pd conjugate which had IC50 values with by 2-fold lower than piroxicam on human liver cancer cell line HepG2. While Pd and Ag conjugates showed 2.3 and 1.9-fold higher effect on human colon cancer cell line HT-29 compared to piroxicam.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143710667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characterization of flexible transparent conductive films fabricated using CVD graphene on heat-resistant transparent polyimide films.","authors":"Yamato Shinada, Makoto Nakamura, Ren Kojima, Masayuki Tsutsumi, Takeshi Watanabe, Shinji Koh","doi":"10.1088/1361-6528/adc138","DOIUrl":"10.1088/1361-6528/adc138","url":null,"abstract":"<p><p>Polymethylmethacrylate (PMMA) is commonly used as a support material in graphene transfer. Heat treatment exceeding 250 °C is required to remove the PMMA after the transfer process. However, the transparent flexible substrates conventionally used for graphene transfer generally exhibit low heat resistance. This hinders the complete removal of the PMMA, resulting in low electrical conductivity of graphene. Therefore, we focused on developing heat-resistant transparent polyimide (TPI) films as substrates for graphene transfer. The interactions between the TPI substrates and chemical vapor deposition graphene were systematically investigated. The effects of the TPI surface roughness, chemical composition, and chemical structure of the TPI, and doping effects of the substrate were examined, and a silane coupling agent (SCA) was coated to bring the TPI surface properties closer to those of a quartz glass substrate. Three-layer stacked graphene (3LG) on TPI, in which the -CF₃group in TPI is replaced with -CH₃, exhibited the highest carrier mobility of 3610 cm²Vs^-1at a constant carrier density after annealing. The sheet resistance of the 3LG on TPI annealed after vapor phase deposition of the SCA was lower than that of the standard TPI and decreased to 82 Ω/sq. after doping with bis(trifluoromethanesulphonyl)amide. This is comparable to the electrical properties of graphene on a quartz glass substrate. Furthermore, after doping, the 3LG/TPI maintained a high optical transmittance of 88.8% at a wavelength of 550 nm. The knowledge obtained from this study will allow graphene flexible transparent conductive films to be transferred onto TPI for use in transparent heaters and solar cells as well as to control the electrical properties for various device applications by modifying the roughness, chemical structure, and coating layers on the surface of the TPI substrate.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143649864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preparation and performance of ZSM-5/MoS₂/PTFE coating for enhancing wear and corrosion resistance.","authors":"Wenjuan Zhang, Kangning Xiong, Dashuai Yan","doi":"10.1088/1361-6528/adc0ab","DOIUrl":"10.1088/1361-6528/adc0ab","url":null,"abstract":"<p><p>The wear and corrosion resistance of water-based polytetrafluoroethylene (PTFE) coating need to be further improved to cope with various harsh environmental conditions. In this paper, a mulberry-like ZSM-5 molecular sieve was prepared and then was modified to enhance the uniformity, wear resistance and hardness of PTFE coating. In addition, a ZSM-5/MoS₂/PTFE coating was developed by adding MoS₂in the chemical composition of coatings, which significantly increased the critical cracking thickness of PTFE to 27<i>μ</i>m. The wear amount of ZSM-5/MoS₂/PTFE coating is only 5.7 mg, and after 680 h of salt spray, there is no obvious corrosion on the surface. The friction coefficients under applied loads of 5 N, 10 N, and 20 N are 0.007, 0.057, and 0.055, respectively. The experiment results show that the coating possesses excellent lubrication, wear resistance, and corrosion resistance, and its performance and cost are far superior to commercial products.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143630679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"<i>In vitro</i>inflammatory and cytotoxic responses of human alveolar cells to amorphous silica nanoparticles exposure.","authors":"Beatriz K A Dal-Cheri, Wanderson de Souza, Luis Mauricio T R Lima, Natalia M A Yoshihara, Celso Sant'Anna, Leonardo C Boldrini, Paulo Emilio C Leite","doi":"10.1088/1361-6528/adbcb3","DOIUrl":"10.1088/1361-6528/adbcb3","url":null,"abstract":"<p><p>Silicon dioxide nanoparticles (SiO₂NPs) are widely used to manufacture products for human consumption. However, their large-scale use in many fields poses risks to industrial workers. In this study, we investigated the cytotoxic and inflammatory potential of SiO₂NPs in the human cell line A549, representing the human alveolar epithelium. The NPs were characterized using energy-dispersive x-ray spectroscopy coupled with scanning electron microscopy, x-ray diffraction, transmission electron microscopy, dispersion, and dynamic light scattering. The effects on A549 cells were monitored by cell adhesion and proliferation using electrical impedance, as well as cell viability, apoptosis, necrosis, and secretion of multiple inflammatory mediators. SiO₂NPs did not alter the adhesion and proliferation of A549 cells but led to cell death by apoptosis at the highest concentrations tested. SiO₂NP impacted the secretion of pro-inflammatory (tumor necrosis factor-<i>α</i>, interleukin (IL)-8, monocyte chemoattractant protein-1, eotaxin, regulated upon activation, normal T cell expressed and secreted, vascular growth factor, granulocyte-macrophage colony-stimulating factor, and granulocyte-colony stimulating factor) and anti-inflammatory (IL-1ra and IL-10) mediators. These results indicate that, even with little impact on cell viability, SiO₂NPs can represent a silent danger, owing to their influence on inflammatory mediator secretion and unbalanced local homeostasis.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143567765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Logic and static memory functions of an inverter comprising a feedback field effect transistor.","authors":"Daon Kim, Doohyeok Lim","doi":"10.1088/1361-6528/adbf27","DOIUrl":"10.1088/1361-6528/adbf27","url":null,"abstract":"<p><p>The von Neumann architecture used as the basic operating principle in computers has a bottleneck owing to the disparity between the central processing unit and memory access speeds, which leads to high power consumption and speed reduction, reducing the overall system performance. However, feedback field-effect transistors (FBFETs) have attracted significant attention owing to their potential to realize next-generation electronic devices based on their switching characteristics. Therefore, in this study, we configured the logic and static memory functions of an inverter comprising a pull-down resistor and an n-channel FBFET using a mixed-mode simulation. The FBFET has a p-n-p-n structure with a gated p-region on the silicon-on-insulator, where each channel length is 30 nm. These modes can have an on/off current ratio of ∼10¹¹and a subthreshold swing of less than 5.4 mV dec^-1. The proposed device can perform logic operations and static memory functions, exhibiting excellent memory functions such as fast write, long hold, and non-destructive read operations. In addition, the inverter operation exhibits nanosecond-level speed and the ability to maintain non-destructive read functionality for over 100 s. The proposed n-FBFET-based inverter is expected to be a promising technology for future high-speed, low-power logic memory applications.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143605894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recent development in friction of supramolecular gel lubricant: from mechanisms to applications.","authors":"Ruochong Zhang, Dongmei Wang, Xinshao Cheng, Minghuan Wang, Xiaodong Hu, Qi Ding, Xuefeng Xu, Meirong Cai, Litian Hu","doi":"10.1088/1361-6528/adc39f","DOIUrl":"https://doi.org/10.1088/1361-6528/adc39f","url":null,"abstract":"<p><p>Due to the unique self-assembling structure and rheological properties, supramolecular gel lubricants have become the third major type of liquid lubricating materials to supplement the lubricating oil and greases. Focusing on the solid-liquid interface compatibility between gelators and base oils, the molecular structures of gelators applicable to oil-based, water-based and extreme conditions base oils were summarized firstly. Furthermore, this review aims at exploring the relationships between the self-assembled structures of gelators and the gel-forming, rheological and frictional properties of gel lubricants. Based on the wide application of gel in various lubrication fields, the synergistic lubricating effect between gel lubricants and nanomaterials, film, textured surfaces were analyzed. The lubrication mechanisms from the solid-liquid interface compatibility between gel lubricants and solid lubricants were attempted to highlighted and revealed. Finally, the perspectives on the development of gel lubricants and corresponding composite lubricating materials were presented. It is hope that our discussion will be beneficial for the growing community of gel lubricant researchers.&#xD.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143674270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ti₃C₂T_<i>X</i>derived layered MXenes as friction and wear reducing additives in lubricating oils: a detailed review.","authors":"Nowduru Ravikiran, Swati Singh","doi":"10.1088/1361-6528/adbb73","DOIUrl":"10.1088/1361-6528/adbb73","url":null,"abstract":"<p><p>Friction and wear are critical aspects that significantly impact the efficiency and durability of mechanical systems. The demand for improved lubricating oils capable of reducing friction and wear has spurred the exploration of advanced additives. Two-dimensional (2D) transition metal carbides, nitrides, and carbonitrides (MXene), a new class of materials, have emerged as promising additives with exceptional tribological properties. This review paper aims to understand the usability of MXene, specifically the ones derived from Ti₃C₂T<i>_X</i>as anti-friction and antiwear additives in lubricating oils. An elaborate discussion is presented about the synthesis and characterization techniques employed in the synthesis of Ti₃C₂T<i>_X</i>(MXene), emphasizing their unique structural and surface properties that could contribute to their tribological performance, followed by their influence on the lubricant's tribological properties is thoroughly discussed. The underlying anti-friction and anti-wear mechanisms, their ability to form tribofilms on sliding surfaces, reduce direct metal-to-metal contact, and minimize wear are also highlighted. Additionally, the role of MXene in modifying the lubricant's chemical and physical interactions with sliding surfaces is analyzed. This review also attempts to identify and address the roadblocks hindering the use of Ti₃C₂T<i>_X</i>MXene in lubricating oils, such as their aggregation tendencies, stability under extreme conditions, and potential side effects on lubricant properties along with the tentative strategies to overcome these hurdles. Relevant experimental findings in which Ti₃C₂T<i>_X</i>derived 2D nano-sheets have been explored as friction and wear-reducing additives in different lubricating oils are critically assessed. Although these MXene are claimed to be highly effective as lubricant additives in lubricating oils owing to their unique properties and versatile chemistry, further research is urgently needed to address the challenges and optimize the formulation and integration of MXene into lubricating oils for practical implementation. This article comprehensively discusses Ti₃C₂T<i>_X</i>MXene as friction and wear-reducing additives in lubricating oils, highlighting the pressing need for further research and the potential for future developments in this field.</p>","PeriodicalId":19035,"journal":{"name":"Nanotechnology","volume":" ","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143527879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}