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Facile one-step synthesis of in situ WO3@Gr nanorods as an efficient material for antimicrobial and decoloration applications 一步法简便合成原位 WO3@Gr 纳米棒,作为抗菌和脱色应用的高效材料
IF 2.1 Pub Date : 2024-05-27 DOI: 10.1088/2043-6262/ad4851
Khoa Dang Nguyen, Nguyen Quang Thinh Le, Linh Tieu Loan Tieu, Thuy Huong Nguyen, Thi Lan Anh Luu, Huu Hung Nguyen, Cong Tu Nguyen and Ngoc Phuong Thao Nguyen
This work examined the synthesis, antibacterial activity, and decolourisation of WO3@Graphene nanorods (WO3@Gr NR). WO3@Gr NR nanocomposite was in situ produced via a facile one-step hydrothermal process employing sodium tungstate dihydrate and exfoliated graphene as precursors. The resulted NR exhibited an average diameter of 13 nm, a large specific surface area of 53.3 m2 g−1, and a bimodal pore size distribution with an average pore size of 5.5 nm. The optical bandgap is extrapolated to be 2.75 eV. Graphene was shown to be responsible for the sample’s elaborate visible-light absorption, which improved adsorption and the ability to harvest visible light. WO3@Gr NR are more efficient against E. coli than S. aureus, killing up to 52% and 39% of cells, respectively, after two hours of treatment. When used in conjunction with invisible light, the NR killed E. coli and S. aureus by 78 and 62%, respectively. The bactericidal activity of photoinduced WO3@Gr NR was evaluated against P. aerugunosa, E. faecalis, E. coli, and S. aureus. The photocatalytic constant rates of organic dye methylene blue (MB) were determined to be 0.01 min−1. An IC50 (50% cell growth inhibition) value of 97 (μg ml−1) was determined for the nanocomposite against human liver cancer cell lines (HepG2). Our findings suggest that this nanorod may be utilised to degrade bacteria and organic colours in wastewater simultaneously while posing no risk to human health.
这项研究考察了 WO3@石墨烯纳米棒(WO3@Gr NR)的合成、抗菌活性和脱色。WO3@Gr NR 纳米复合材料以二水钨酸钠和剥离石墨烯为前驱体,通过简单的一步水热法原位制备而成。所制得的 NR 平均直径为 13 nm,比表面积高达 53.3 m2 g-1,孔径呈双峰分布,平均孔径为 5.5 nm。光带隙推断为 2.75 eV。研究表明,石墨烯对样品的可见光吸收起了重要作用,从而提高了吸附和收集可见光的能力。与金黄色葡萄球菌相比,WO3@Gr NR 对大肠杆菌的杀灭效率更高,处理两小时后,对细胞的杀灭率分别高达 52% 和 39%。当与不可见光同时使用时,NR 对大肠杆菌和金黄色葡萄球菌的杀灭率分别为 78% 和 62%。评估了光诱导 WO3@Gr NR 对绿脓杆菌、粪大肠杆菌、大肠杆菌和金黄色葡萄球菌的杀菌活性。有机染料亚甲基蓝(MB)的光催化常数为 0.01 min-1。纳米复合材料对人肝癌细胞株(HepG2)的 IC50(50% 细胞生长抑制)值为 97 (μg ml-1)。我们的研究结果表明,这种纳米棒可以同时降解废水中的细菌和有机色素,而且不会对人体健康造成危害。
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引用次数: 0
Directly electrospun copper ferrite CuFe2O4 nanofiber-based for gas classification 用于气体分级的直接电纺铜铁氧体 CuFe2O4 纳米纤维
IF 2.1 Pub Date : 2024-05-27 DOI: 10.1088/2043-6262/ad4850
Hong Phuoc Phan, Van Hoang Nguyen, Ngoc-Viet Nguyen and Van Hieu Nguyen
The cross-response is a considerable primary challenge of gas sensors based on semiconducting metal oxide (SMO), especially in detecting and classifying gases with comparable properties. In this work, the copper ferrite (CuFe2O4, CFO) nanofibers (NFs)-based sensors were straightforwardly synthesised by electrospinning technique. The morphology of the CFO NFs was observed using scanning electron microscopy (SEM), which revealed a rough surface with a diameter of approximately 80 nm. The composition of the fiber was confirmed by energy dispersive spectroscopy (EDS), which showed the fiber’s chemical elements to include Cu, Fe, and O. The microstructural characteristics of the CFO NFs were analysed using x-ray diffraction (XRD) and Raman spectroscopy, confirming the characteristic peaks of the CFO phase. The gas sensing characteristics of CFO-based sensors have been examined to 25−200 ppm of various gases of (CH3)2CO, CH3CH2OH, NH3, and H2 at a function of working temperature of 350−450 °C. The gas-sensing mechanism of the sensor based on CFO NFs is explained by the surface depletion layer and the grain boundary model. The successful categorisation of these gases into distinct groups was realised, indicating that the issue of cross-response caused by interfering gases was effectively addressed with the aid of an artificial intelligence algorithm.
交叉反应是基于半导体金属氧化物(SMO)的气体传感器面临的主要挑战,尤其是在检测和分类具有相似性质的气体时。在这项研究中,利用电纺丝技术直接合成了基于铜铁氧体(CuFe2O4,CFO)纳米纤维(NFs)的传感器。使用扫描电子显微镜(SEM)观察了 CFO 纳米纤维的形态,发现其表面粗糙,直径约为 80 纳米。使用 X 射线衍射 (XRD) 和拉曼光谱分析了 CFO 无纺布的微观结构特征,确认了 CFO 相的特征峰。在 350-450 °C 的工作温度下,研究了基于 CFO 的传感器对 25-200 ppm 的 (CH3)2CO、CH3CH2OH、NH3 和 H2 等各种气体的传感特性。基于 CFO NFs 的传感器的气体传感机制是通过表面耗尽层和晶界模型来解释的。成功地将这些气体划分为不同的组别,表明借助人工智能算法有效地解决了干扰气体引起的交叉反应问题。
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引用次数: 0
Enhanced anti-breast cancer activity of green synthesized selenium nanoparticles by PEGylation: induction of apoptosis and potential anticancer drug delivery system 通过 PEG 化增强绿色合成硒纳米粒子的抗乳腺癌活性:诱导细胞凋亡和潜在的抗癌药物输送系统
IF 2.1 Pub Date : 2024-05-27 DOI: 10.1088/2043-6262/ad4bae
Samer Y Al-Qaraleh, Wael A Al-Zereini, Sawsan A Oran, Osama Y Al-Madanat, Aiman I Al-Qtaitat and Abdalrahim Alahmad
Breast cancer is a disease associated with high morbidity and mortality rates worldwide. The potential use of biogenic nanoparticles as alternative anticancer agents has been immensely acknowledged in several studies, particularly selenium nanoparticles (SeNPs). Nanoparticles were synthesised using the aqueous extract of Moringa peregrine (MPM-SeNPs) and were PEGylated (PEG-MPM-SeNPs). MPM-SeNPs were characterised by chemical and physical techniques. The successful capping of MPM-SeNPs with PEG was confirmed by spectrophotometric measurements and via Fourier-transform infrared spectroscopy (FT-IR) analysis. Furthermore, the effect of PEGylation of MPM-SeNPs on enhancing their anti-breast cancer activity and as a drug delivery agent was evaluated. Therefore, the loading efficiency and release of DOX at different pH values were measured; the antiproliferative activity of PEG-MPM-SeNPs against the adenocarcinoma breast cancer cell line (MDA-MB-231) was evaluated and compared with that of biogenic MPM-SeNPs and DOX-conjugated PEG-MPM-SeNPs. PEG-MPM-SeNPs and DOX-PEG-MPM-SeNPs had reduced IC50 values compared to MPM-SeNPs; IC50 of 11.54 ± 1.74 and 31.27 ± 2.9 μg mL−1 compared to 71.4 ± 3.4 μg mL−1, respectively. MPM-SeNPs and PEG-MPM-SeNPs caused apoptosis to MDA-MB-231 cells with a significant decrease in the mitochondrial membrane potential (MMP), increase in the released cytochrome C (Cyt C), and activation of caspase-3/9 (P < 0.05). Linking DOX to PEG-MPM-SeNPs led to an increase in caspase-3/8 concentrations and an increase in the released Cyt C, but there were non-significant differences in MMP (P > 0.1) between treated and untreated control cancer cells. MPM-SeNPs and PEG-MPM-SeNPs caused apoptotic reactions via an intrinsic pathway, while linking DOX to PEG-MPM-SeNPs caused apoptosis in cancer cells through an extrinsic pathway.
乳腺癌是全世界发病率和死亡率都很高的一种疾病。生物纳米粒子(尤其是硒纳米粒子(SeNPs))作为替代抗癌剂的潜在用途已在多项研究中得到广泛认可。研究人员使用辣木的水提取物合成了纳米颗粒(MPM-SeNPs),并对其进行了 PEG 化处理(PEG-MPM-SeNPs)。MPM-SeNPs 采用化学和物理技术进行表征。通过分光光度测量和傅立叶变换红外光谱(FT-IR)分析,证实了 MPM-SeNPs 与 PEG 的成功封装。此外,还评估了 PEG 化 MPM-SeNPs 对提高其抗乳腺癌活性和作为药物递送剂的效果。因此,测量了 DOX 在不同 pH 值下的负载效率和释放量;评估了 PEG-MPM-SeNPs 对腺癌乳腺癌细胞系(MDA-MB-231)的抗增殖活性,并与生物源 MPM-SeNPs 和 DOX 共轭 PEG-MPM-SeNPs 的抗增殖活性进行了比较。与 MPM-SeNPs 相比,PEG-MPM-SeNPs 和 DOX-PEG-MPM-SeNPs 的 IC50 值有所降低;IC50 分别为 11.54 ± 1.74 和 31.27 ± 2.9 μg mL-1 ,而 MPM-SeNPs 为 71.4 ± 3.4 μg mL-1。MPM-SeNPs 和 PEG-MPM-SeNPs 可导致 MDA-MB-231 细胞凋亡,线粒体膜电位(MMP)显著降低,释放的细胞色素 C(Cyt C)增加,Caspase-3/9 被激活(P < 0.05)。将 DOX 与 PEG-MPM-SeNPs 连接会导致 Caspase-3/8 浓度增加和释放的细胞色素 C 增加,但在处理过的和未处理过的对照组癌细胞之间,MMP 的差异并不显著(P > 0.1)。MPM-SeNPs和PEG-MPM-SeNPs通过内在途径导致凋亡反应,而将DOX与PEG-MPM-SeNPs连接则通过外在途径导致癌细胞凋亡。
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引用次数: 0
A current review on boron nitride nanotubes and their applications 氮化硼纳米管及其应用综述
IF 2.1 Pub Date : 2024-02-06 DOI: 10.1088/2043-6262/ad22d6
Adithya Lenin Tamilkovan, Pandurangan Arumugam
BNNTs are the tubular variants of the ceramic compound hexagonal boron nitride (hBN) and are known for their high thermal and chemical stability. The research on BNNTs is ever-evolving, researchers are on a quest to optimise the synthesis procedure for the nanomaterial. Here a variety of currently followed synthesis techniques were discussed and compared. X-ray diffraction patterns and electron microscopy results of BNNTs synthesised by various techniques were compared, this would give the pros and cons of each synthesis technique. Based on this, suggestions for the best-suited synthesis technique from an academic as well as industrial perspective were given. The individual properties of these nanotubes, along with their potential applications in the field of spintronics, surface wetting, and radiation capture were delineated.
BNNTs 是陶瓷化合物六方氮化硼(hBN)的管状变体,以其高度的热稳定性和化学稳定性而著称。有关 BNNTs 的研究一直在不断发展,研究人员一直在努力优化这种纳米材料的合成过程。在此,我们对目前采用的各种合成技术进行了讨论和比较。通过比较各种技术合成的 BNNT 的 X 射线衍射图样和电子显微镜结果,可以看出每种合成技术的优缺点。在此基础上,从学术和工业角度对最适合的合成技术提出了建议。此外,还介绍了这些纳米管的特性,以及它们在自旋电子学、表面润湿和辐射捕获领域的潜在应用。
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引用次数: 0
A review on the types of nanomaterials and methodologies used for the development of biosensors 纳米材料类型及生物传感器开发方法综述
IF 2.1 Pub Date : 2024-02-02 DOI: 10.1088/2043-6262/ad21e8
Sourav Ghosh, K Martin Sagayam, Dibyajyoti Haldar, A Amir Anton Jone, Biswaranjan Acharya, Vassilis C Gerogiannis, Andreas Kanavos
Biosensors have gained significant attention in various fields such as food processing, agriculture, environmental monitoring, and healthcare. With the continuous advancements in research and technology, a wide variety of biosensors are being developed to cater to diverse applications. However, the effective development of nanobiosensors, particularly the synthesis of nanomaterials, remains a crucial step. Many nanobiosensors face challenges related to instability and selectivity, making it difficult to achieve proper packaging. While some biosensors have been successfully implemented in commercial settings, there is a pressing need to address their limitations and advance their capabilities. The next generation of biosensors, based on nanomaterials, holds promise in overcoming these challenges and enhancing the overall performance of biosensor devices. The commercial viability of these biosensors will rely on their accuracy, reliability, and cost-effectiveness. This review paper provides an overview of various types of nanomaterials and their applications in the development of nanobiosensors. The paper highlights a comparison of different nanomaterial-based biosensors, discussing their advantages, limitations, and performance characteristics.
生物传感器在食品加工、农业、环境监测和医疗保健等各个领域都获得了极大的关注。随着研究和技术的不断进步,各种生物传感器正被开发出来,以满足不同的应用需求。然而,纳米生物传感器的有效开发,尤其是纳米材料的合成,仍然是至关重要的一步。许多纳米生物传感器面临着与不稳定性和选择性有关的挑战,因此很难实现适当的封装。虽然一些生物传感器已成功应用于商业环境,但仍迫切需要解决其局限性并提高其能力。基于纳米材料的下一代生物传感器有望克服这些挑战,并提高生物传感器设备的整体性能。这些生物传感器的商业可行性将取决于其准确性、可靠性和成本效益。本综述概述了各种类型的纳米材料及其在纳米生物传感器开发中的应用。本文重点比较了不同的纳米材料生物传感器,讨论了它们的优势、局限性和性能特点。
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引用次数: 0
Biogenic synthesis of silver, gold, and palladium nanoparticles using moringa oleifera seeds: exploring photocatalytic, catalytic, and antimicrobial activities 利用油茶籽生物合成银、金和钯纳米粒子:探索光催化、催化和抗菌活性
IF 2.1 Pub Date : 2024-01-19 DOI: 10.1088/2043-6262/ad1a9b
M S Anandha Prabhu, G Edwin Sheela, Abeer M Mohammad, Rabab A Hegazy, S Sasi Florence, V Sarojini
In this study, we explored the green synthesis of metal nanoparticles (Ag-NPs, Au-NPs, and Pd-NPs) using Moringa oleifera seed (MOS) extract, which is known for its nutrient density, antioxidant properties, anti-inflammatory effects, and potential benefits in managing cholesterol, blood sugar levels, as well as promoting digestion, skin, and hair health. The nanoparticles’ size was controlled by varying the concentration of MOS extract. The successful formation of Au-NPs and Ag-NPs was confirmed through surface plasmon resonance (SPR), while the absence of absorption at 420 nm indicated the reduction of Pd2+ ions to Pd0, affirming the synthesis of Pd-NPs. The nanoparticles exhibited mono-dispersed, spherical shapes with confirmed crystallinity. Sizes were determined as 28 nm for Pd-NPs, 5 nm for Au-NPs, and 19 nm for Ag-NPs. The MOS extract’s phenols and proteins played a crucial role in reducing and stabilising Ag-NPs, Au-NPs, and Pd-NPs. Notably, the synthesised nanoparticles demonstrated strong antimicrobial activity, particularly against Salmonella typhi, making them potential antibacterial agents. The catalytic efficiency of Au-NPs, Ag-NPs and Pd-NPs was studied using the reduction of 4-Nitrophenol (4-NP) by NaBHto 4-Aminophenol. Additionally, Au-NPs showed enhanced photocatalytic degradation rate constant and catalytic reaction rate constant of 0.0038/min and 0.261/min respectively, due to their small size and increased surface area. By combining a green synthesis approach with an in-depth analysis of properties and diverse applications, this study provides valuable insights into the immense potential of MOS-assisted metal nanoparticles for various technological and environmental advancements.
在本研究中,我们探索了利用油辣木籽(MOS)提取物绿色合成金属纳米粒子(Ag-NPs、Au-NPs 和 Pd-NPs)的方法。油辣木籽因其营养密度高、抗氧化性强、抗炎效果好以及在控制胆固醇和血糖水平、促进消化、皮肤和头发健康方面具有潜在益处而闻名。通过改变 MOS 提取物的浓度来控制纳米粒子的大小。通过表面等离子体共振(SPR)证实了 Au-NPs 和 Ag-NPs 的成功形成,而 420 纳米处没有吸收表明 Pd2+ 离子被还原成 Pd0,从而证实了 Pd-NPs 的合成。纳米粒子呈单分散球形,结晶度得到证实。经测定,Pd-NPs 的尺寸为 28 nm,Au-NPs 为 5 nm,Ag-NPs 为 19 nm。MOS 提取物中的酚类和蛋白质在还原和稳定 Ag-NPs、Au-NPs 和 Pd-NPs 方面发挥了重要作用。值得注意的是,合成的纳米粒子具有很强的抗菌活性,特别是对伤寒沙门氏菌,使其成为潜在的抗菌剂。利用 NaBH4 将 4-硝基苯酚(4-NP)还原为 4-氨基苯酚,研究了 Au-NPs、Ag-NPs 和 Pd-NPs 的催化效率。结果表明,Ag-NPs 和 Pd-NPs 的光催化降解率常数和催化反应率常数分别为 0.0038/min 和 0.261/min,而 Au-NPs 的光催化降解率常数和催化反应率常数分别为 0.0038/min 和 0.261/min。通过将绿色合成方法与对其特性和多样化应用的深入分析相结合,本研究为 MOS 辅助金属纳米粒子在各种技术和环境进步方面的巨大潜力提供了宝贵的见解。
{"title":"Biogenic synthesis of silver, gold, and palladium nanoparticles using moringa oleifera seeds: exploring photocatalytic, catalytic, and antimicrobial activities","authors":"M S Anandha Prabhu, G Edwin Sheela, Abeer M Mohammad, Rabab A Hegazy, S Sasi Florence, V Sarojini","doi":"10.1088/2043-6262/ad1a9b","DOIUrl":"https://doi.org/10.1088/2043-6262/ad1a9b","url":null,"abstract":"In this study, we explored the green synthesis of metal nanoparticles (Ag-NPs, Au-NPs, and Pd-NPs) using <italic toggle=\"yes\">Moringa oleifera</italic> seed (MOS) extract, which is known for its nutrient density, antioxidant properties, anti-inflammatory effects, and potential benefits in managing cholesterol, blood sugar levels, as well as promoting digestion, skin, and hair health. The nanoparticles’ size was controlled by varying the concentration of MOS extract. The successful formation of Au-NPs and Ag-NPs was confirmed through surface plasmon resonance (SPR), while the absence of absorption at 420 nm indicated the reduction of Pd<sup>2+</sup> ions to Pd<sup>0</sup>, affirming the synthesis of Pd-NPs. The nanoparticles exhibited mono-dispersed, spherical shapes with confirmed crystallinity. Sizes were determined as 28 nm for Pd-NPs, 5 nm for Au-NPs, and 19 nm for Ag-NPs. The MOS extract’s phenols and proteins played a crucial role in reducing and stabilising Ag-NPs, Au-NPs, and Pd-NPs. Notably, the synthesised nanoparticles demonstrated strong antimicrobial activity, particularly against <italic toggle=\"yes\">Salmonella typhi</italic>, making them potential antibacterial agents. The catalytic efficiency of Au-NPs, Ag-NPs and Pd-NPs was studied using the reduction of 4-Nitrophenol (4-NP) by NaBH<sub>4 </sub>to 4-Aminophenol. Additionally, Au-NPs showed enhanced photocatalytic degradation rate constant and catalytic reaction rate constant of 0.0038/min and 0.261/min respectively, due to their small size and increased surface area. By combining a green synthesis approach with an in-depth analysis of properties and diverse applications, this study provides valuable insights into the immense potential of MOS-assisted metal nanoparticles for various technological and environmental advancements.","PeriodicalId":7359,"journal":{"name":"Advances in Natural Sciences: Nanoscience and Nanotechnology","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2024-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139508552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Synthesis and application of ZSM-5/Graphene composite for photocatalytic degradation of industrial dyes 用于光催化降解工业染料的 ZSM-5/Graphene 复合材料的合成与应用
IF 2.1 Pub Date : 2024-01-19 DOI: 10.1088/2043-6262/ad1a9e
Veena Sodha, Mahuya Bandyopadhyay, Rama Gaur, Rajib Bandyopadhyay, Syed Shahabuddin
Various materials and technologies are being employed to address the concern of increased wastewater generation. In this work, the synthesis of ZSM-5 (Zeolite Socony Mobil-5) and graphene (GR) composite, their characterisation, and application for the removal of dyes are presented. Two composites of ZSM-5 and GR composites were prepared via the hydrothermal method by varying the loading amount of GR, i.e. 1% and 5%, and labelled as GZ1 and GZ5. The parent and composite materials were characterised using field emission scanning electron microscope (FE-SEM), x-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), x-ray photoelectrons spectroscopy (XPS), Raman, and Fourier transform infrared (FTIR). The materials were then employed for the photodegradation of methyl orange (MO) dye. The adsorption efficiencies for ZSM-5, GR, GZ1, and GZ5 were found as 0%, 17.8%, 0%, and 16% respectively. According to photodegradation results, the GZ1 composite exhibits the maximum degradation efficiency of 75.3% for 20 ppm of MO, within 180 min of light exposure. The scavenger studies were performed to evaluate the role of active oxygen species (AOS) in the photocatalysis mechanism. All studies were performed with the catalyst dosage of 0.5 mg ml−1. The degradation efficiencies for GR, GZ5, and Z5 were reported as 34.2%, 20.8%, and 17.5%, respectively. On increasing the irradiation time to 240 min, the degradation efficiency of GZ1 reached 92%. The removal efficiencies for MO (7 ppm) and methyl blue (5 ppm) in a 12-ppm dye mixture were observed to be 98% and 97.2% respectively within 180 min of light exposure with GZ1 composite.
目前正在采用各种材料和技术来解决废水产生量增加的问题。本研究介绍了 ZSM-5(沸石 Socony Mobil-5)和石墨烯(GR)复合材料的合成、特性及其在去除染料方面的应用。通过水热法制备了两种 ZSM-5 和石墨烯复合材料,改变了石墨烯的负载量,即 1%和 5%,并标记为 GZ1 和 GZ5。使用场发射扫描电子显微镜 (FE-SEM)、X 射线衍射 (XRD)、漫反射光谱 (DRS)、X 射线光电子能谱 (XPS)、拉曼光谱和傅立叶变换红外光谱 (FTIR) 对母体材料和复合材料进行了表征。然后将这些材料用于甲基橙(MO)染料的光降解。ZSM-5、GR、GZ1 和 GZ5 的吸附效率分别为 0%、17.8%、0% 和 16%。光降解结果显示,GZ1 复合材料在光照 180 分钟内对 20 ppm MO 的降解效率最高,达到 75.3%。为了评估活性氧(AOS)在光催化机理中的作用,进行了清除剂研究。所有研究都是在催化剂用量为 0.5 mg ml-1 的条件下进行的。据报告,GR、GZ5 和 Z5 的降解效率分别为 34.2%、20.8% 和 17.5%。将辐照时间延长至 240 分钟后,GZ1 的降解效率达到了 92%。在使用 GZ1 复合材料对 12ppm 的染料混合物进行光照射 180 分钟后,对 MO(7 ppm)和甲基蓝(5 ppm)的去除率分别达到 98% 和 97.2%。
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引用次数: 0
Hetero-epitaxial grown Pt@Au core-shell bimetallic nanoparticles on reduced graphene oxide (RGO) as electrocatalyst for oxygen reduction reaction in alkaline media 还原型氧化石墨烯 (RGO) 上异质外延生长的 Pt@Au 核壳双金属纳米粒子作为碱性介质中氧还原反应的电催化剂
IF 2.1 Pub Date : 2024-01-17 DOI: 10.1088/2043-6262/ad1a9d
P Raghavendra, Y Chandra Sekhar, G Vishwakshan Reddy, P Sri Chandana, L Subramanyam Sarma
The core-shell structured Pt@Aubimetallic nanoparticles (NPs) were decorated on the reduced graphene oxide (RGO) surface by a heteroepitaxial growth method. The morphological details of Pt@Au/RGO core/shell bimetallic NPs were assessed by high-resolution transmission electron microscopy (HR-TEM), x-ray diffraction (XRD), and energy-dispersive x-ray spectroscopy (EDS). Electron microscopy results revealed that Pt@Au particles of 3.4 nm were firmly attached to RGO sheets. The electrochemical response of Pt@Au/RGO nanostructured electrocatalyst was measured through cyclic voltammetry (CV) at room temperature in 0.1 M KOH solution. Oxygen reduction reaction (ORR) efficacies of Pt@Au/RGO were evaluated by linear sweep voltammetry (LSV) by rotating catalyst-coated glassy carbon (GC) electrode at different rotation speeds in oxygen saturated 0.1 M KOH solution. The electrochemical activity descriptors (half-wave potential, onset potential, limiting current density) were assessed from ORR polarisation curves. The results revealed that Pt@Au/RGO bimetallic NPs showed enhanced higher catalytic activity towards ORR compared to commercial Pt/C catalyst as well as similarly synthesised Pt/RGO and Au/RGO. The enhanced catalytic activity of Pt@Au/RGO electrocatalyst might result from the core/shell structure with a tiny Pt core and a thin Au shell, as well as the synergistic effects of Au and Pt.
采用异质外延生长法在还原氧化石墨烯(RGO)表面装饰了核壳结构的 Pt@Aubimetallic 纳米粒子(NPs)。通过高分辨率透射电子显微镜(HR-TEM)、X 射线衍射(XRD)和能量色散 X 射线光谱(EDS)评估了 Pt@Au/RGO 核/壳双金属 NPs 的形态细节。电子显微镜结果显示,3.4 nm 的 Pt@Au 颗粒牢固地附着在 RGO 片上。室温下,在 0.1 M KOH 溶液中,通过循环伏安法(CV)测量了 Pt@Au/RGO 纳米结构电催化剂的电化学响应。在氧气饱和的 0.1 M KOH 溶液中,以不同的转速旋转涂有催化剂的玻璃碳(GC)电极,通过线性扫描伏安法(LSV)评估了 Pt@Au/RGO 的氧还原反应(ORR)效率。根据 ORR 极化曲线评估了电化学活性描述因子(半波电位、起始电位、极限电流密度)。结果表明,与商用 Pt/C 催化剂以及类似合成的 Pt/RGO 和 Au/RGO 相比,Pt@Au/RGO 双金属 NPs 在 ORR 方面表现出更高的催化活性。Pt@Au/RGO 电催化剂催化活性的增强可能是由于其具有微小的铂核和较薄的金壳的核/壳结构,以及金和铂的协同效应。
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引用次数: 0
Study on immobilisation process on lateral flow assay test strip for detection of Enrofloxacin antibiotic by inkjet printing 通过喷墨打印固定化工艺研究用于检测恩诺沙星抗生素的横向流动检测试纸
IF 2.1 Pub Date : 2024-01-17 DOI: 10.1088/2043-6262/ad1aa0
Duc Minh Trinh Dinh, Anh Van Thi Le, Phuong Hong Lam, Mai Thi Le, Dung My Thi Dang, Chien Mau Dang, Ngan Nguyen Le
Enrofloxacin has been widely and increasingly used in veterinary medicine to treat infection on animals which could lead to antibiotic resistance for the consumer. Among the available detection techniques for Enrofloxacin, immunoassay lateral flow test strip is realised to be a rapid and accurate detection method for on-site analysis of Enrofloxacin antibiotic. The current study aims to analyse the application of inkjet printing technology on the immobilisation of biological substances at the test line and control line position of the test strip. With the printing parameters value at 35 °C, 35 °C, 7 layers and 15 μm for cartridge temperature, substrate temperature, printing layers and drop spacing, respectively, the fabricated test strips show correlation coefficient R2 at 0.993 for the test with Enrofloxacin samples in the concentration range from 0 to 100 ppb. Compared to conventional fabrication method, the immobilisation process utilising inkjet printing technology is considered to be superior in printing patterns with a simple and material-saving process, which holds a potential of innovative and financially beneficial approach for on-site detection of Enrofloxacin antibiotic.
恩诺沙星越来越广泛地应用于兽医治疗动物感染,这可能会导致消费者对抗生素产生抗药性。在现有的恩诺沙星检测技术中,免疫测定侧流试纸被认为是现场分析恩诺沙星抗生素的一种快速准确的检测方法。本研究旨在分析喷墨打印技术在测试条测试线和控制线位置固定生物物质的应用。在墨盒温度、基底温度、打印层数和墨滴间距分别为 35 °C、35 °C、7 层和 15 μm 的条件下,制成的试纸与恩诺沙星样品在 0 至 100 ppb 浓度范围内的测试相关系数 R2 为 0.993。与传统的制造方法相比,利用喷墨打印技术的固定化工艺在打印图案方面更胜一筹,而且工艺简单、节省材料,是一种具有创新潜力和经济效益的现场检测恩诺沙星抗生素的方法。
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引用次数: 0
Highly uniform core/shell structures AuR/Ag and AuR/Ag@BSA with various shell thicknesses for surface-enhanced Raman scattering 用于表面增强拉曼散射的具有不同壳厚度的高度均匀核/壳结构 AuR/Ag 和 AuR/Ag@BSA
IF 2.1 Pub Date : 2024-01-16 DOI: 10.1088/2043-6262/ad1a9a
Khac Khoi Tran, Tien Ha Le, Viet Ha Chu, Thi Hue Do
This work indicates the synthesis of uniform core/shell nanostructures (AuR/Ag) with different thicknesses of Ag shell by the double seed method. This method consists of two self-sufficient progresses, one seed for the formation of gold nanorods (AuRs) and one for the formation of the Ag shell for the gold nanorods to form the AuR/Ag. Acid ascorbic (L-AA) acts as a weak reducing agent and hexadecyltrimethylammonium chloride (CTAC) acts as a surfactant for Ag shell. The formation and growth of the Ag shell were carefully investigated by changing the reaction factors such as temperature, time, and concentration of AgNO3. The greater the concentration of AgNO3 shelling precursor, the thicker the shell and therefore the more high-energy vibrational modes appear in the near-ultraviolet region. In survey of surface-enhanced Raman scattering effect of AuRs and AuR/Ag with Rhodamine B (RB) detector, the results show that AuR/Ag has the ability to enhance Raman signal much better than AuRs. At the same time, the thicker the Ag shell, the better the Raman signal enhancement ability.
这项研究表明,利用双种子法合成了具有不同厚度银壳的均匀核/壳纳米结构(AuR/Ag)。该方法包括两个自给自足的过程,一个种子用于形成金纳米棒(AuRs),另一个种子用于形成金纳米棒的银壳,从而形成 AuR/Ag。抗坏血酸(L-AA)作为弱还原剂,十六烷基三甲基氯化铵(CTAC)作为银壳的表面活性剂。通过改变温度、时间和 AgNO3 浓度等反应因素,仔细研究了银壳的形成和生长过程。AgNO3 脱壳前驱体的浓度越高,外壳越厚,因此在近紫外区出现的高能振动模式也越多。在利用罗丹明 B(RB)探测器对 AuRs 和 AuR/Ag 的表面增强拉曼散射效应进行研究时,结果表明 AuR/Ag 比 AuRs 具有更好的增强拉曼信号的能力。同时,银壳越厚,拉曼信号增强能力越强。
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Advances in Natural Sciences: Nanoscience and Nanotechnology
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