Nano express最新文献

NO2 sensing characteristics by α-Fe2O3 nanorod arrays with atomic layer deposited amorphous Al2O3 overlayer 具有原子层沉积非晶态 Al2O3 覆层的 α-Fe2O3 纳米棒阵列的二氧化氮传感特性

Nano express Pub Date : 2024-06-14 DOI: 10.1088/2632-959x/ad585b

Swati Dhua, Ashish Kumar Singh, Sanju Rani, Jatin Kumar Rath, Somnath C. Roy

{"title":"NO2 sensing characteristics by α-Fe2O3 nanorod arrays with atomic layer deposited amorphous Al2O3 overlayer","authors":"Swati Dhua, Ashish Kumar Singh, Sanju Rani, Jatin Kumar Rath, Somnath C. Roy","doi":"10.1088/2632-959x/ad585b","DOIUrl":"https://doi.org/10.1088/2632-959x/ad585b","url":null,"abstract":"\u0000 We have grown α-Fe2O3 nanorods by solution processing followed by the deposition of Al2O3 overlayer using atomic layer deposition. Al2O3 layer was deposited for two different thicknesses 4 nm and 8 nm and a post-deposition annealing at 550 °C for 2 hours in air atmosphere was performed. Crystallinity analysis through X-ray diffraction (XRD) reveals that the α-Fe2O3 nanorods crystallized into rhombohedral structure, whereas the outer Al2O3 layers remained largely amorphous. Interestingly, the interface showed signs of AlFexOy formation as observed through high-resolution transmission electron microscopy images. Gas sensing characteristics were studied using NO2 with 10, 50, and 100 ppm concentrations at operating temperatures of 30, 100, 150 and 190 °C. The room temperature sensitivity values obtained in response to 10 ppm NO2 were 31%, which surpassed the previously reported values. A higher concentration of surface adsorbed oxygen on the Al2O3 overlayer, as revealed by the X-ray photoelectron spectroscopy (XPS) analysis, led to enhanced NO2 sensing at room temperature. A lower activation energy (0.29 eV) of barrier to charge transport for Al2O3 coated α-Fe2O3 nanorods compared to that of bare nanorods (0.45 eV), as calculated from the temperature dependent I-V measurements, supported observation of higher sensitivity at room temperature.","PeriodicalId":484840,"journal":{"name":"Nano express","volume":"38 25","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141339956","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

Transition metal sulfide nanostructures: synthesis and application in metal-air batteries 过渡金属硫化物纳米结构：合成及在金属空气电池中的应用

Nano express Pub Date : 2024-06-14 DOI: 10.1088/2632-959x/ad585c

Sundaramoorthy Marimuthu, Palanisamy Kannan, Govindhan Maduraiveeran

{"title":"Transition metal sulfide nanostructures: synthesis and application in metal-air batteries","authors":"Sundaramoorthy Marimuthu, Palanisamy Kannan, Govindhan Maduraiveeran","doi":"10.1088/2632-959x/ad585c","DOIUrl":"https://doi.org/10.1088/2632-959x/ad585c","url":null,"abstract":"\u0000 Owing to great energy density, eco-friendliness, safety and security, and cost-effectiveness, rechargeable metal-air batteries (MABs) have engrossed substantial devotion. The MABs signify one of the most feasible forthcoming alternatives to powering electric vehicles (EVs) and smart-grid energy storage. The progress of MABs has offered a solution benefitting from its much higher theoretical energy density than that of lithium-ion batteries (LIB). However, certain technical difficulties allied with metal-air batteries include sluggish electrochemical oxygen reaction kinetics that has yet to be fixed. The transition single metal and mixed metals sulfides (TMS) nanostructures have validated an advanced electrocatalytic oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) performance, due to their higher electronic conductivity and fast-charge transfer kinetics. The bifunctional electrocatalytic act of the TMSs can be enhanced by altering the electronic configuration, double layer structure and interface, valence state, and vacancies. In this minireview, the preparation, properties, and testing of electrode components of transition metal sulfides (TMS) nanomaterials towards different types of metal-air batteries (aqueous and non-aqueous), the fundamentals, configuration of battery, choice of electrode materials, electrolyte, and separator, current challenges as well as perspectives of the design of high-performance MABs are also discussed based on the existing execution.","PeriodicalId":484840,"journal":{"name":"Nano express","volume":"12 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141343475","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

Antibacterial and photo dye degradative ability of copper oxide nanoparticles from Pleurotus cystidiosus 壳斗藻纳米氧化铜的抗菌和光染料降解能力

Nano express Pub Date : 2024-06-10 DOI: 10.1088/2632-959x/ad560f

S. Kamakshi, Anantha Lakshmi, Shenbhagaraman R, Brayden Ryo Jenavio, R. Siva, G. Lakshmanan, Selvakumari J

{"title":"Antibacterial and photo dye degradative ability of copper oxide nanoparticles from Pleurotus cystidiosus","authors":"S. Kamakshi, Anantha Lakshmi, Shenbhagaraman R, Brayden Ryo Jenavio, R. Siva, G. Lakshmanan, Selvakumari J","doi":"10.1088/2632-959x/ad560f","DOIUrl":"https://doi.org/10.1088/2632-959x/ad560f","url":null,"abstract":"\u0000 The present study deals with in vitro experiments for to develop synthesized copper nanoparticles using Pleurotus cystidiosus. Mushroom-based nanoparticles, such as copper nanoparticles have become more significant because of potential biocatalytic properties, including antibacterial activity. The blue-to-brown color shift suggests CuNPs, as confirmed by absorbance maxima at 246 nm in ultraviolet spectroscopy. FTIR spectra reveal the existence of carboxyl, alcohol, and aldehyde carbon; the amine group represents the myco-synthesized copper nanoparticle. Scanning electron microscopy (SEM) nanoparticles show spherical to oval nano aggregates of 100–130 nm in size. The EDX spectrum confirms the presence of Cu at 8.00 keV in myco-synthesized copper nanoparticles. The antimicrobial efficacy of produced copper nanoparticles on human pathogens showed a maximum zone of inhibition against coliform bacteria such as Enterococcus faecalis, Enterobacter aerogenes, and E. coli, followed by a moderate zone of inhibition recorded in Streptococcus mutans. The photocatalytic activity of Congo red dye, Malachite green dye, and Remazol blue dye by copper nanoparticles from Pleurotus cystidiosus was investigated, and the results showed a maximum degradation efficiency of 99.2% in Congo red within 90 minutes. However, moderate degradation was noted in malachite green, and Remazol blue dye has a low degradation efficiency. Thus, myco-synthesized copper nanoparticles from Pleurotus cystidiosus have potent antimicrobial and photocatalytic dye degradation efficacy.","PeriodicalId":484840,"journal":{"name":"Nano express","volume":" 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141364790","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

Investigating microplastics and nanoplastics released from food bag ziplock using SEM and Raman imaging 利用扫描电子显微镜和拉曼成像技术研究食品袋拉链中释放的微塑料和纳米塑料

Nano express Pub Date : 2024-06-04 DOI: 10.1088/2632-959x/ad53ea

Cheng Fang, Jingxian Yu, Saianand Gopalan, Ravi Naidu

{"title":"Investigating microplastics and nanoplastics released from food bag ziplock using SEM and Raman imaging","authors":"Cheng Fang, Jingxian Yu, Saianand Gopalan, Ravi Naidu","doi":"10.1088/2632-959x/ad53ea","DOIUrl":"https://doi.org/10.1088/2632-959x/ad53ea","url":null,"abstract":"\u0000 Microplastic contamination is a concern in our daily lives, such as being released from self-sealing ziplock (sliderless zipper) plastic bags commonly used for food storage. That is because during the closure and opening process, due to friction and deformation, the male rim inserting into or separating from the female rim can release debris as micro- and nanoplastics (MNP). Herein, we initially observed the released debris using scanning electron microscopy (SEM). Subsequently, Raman imaging was employed to directly visualise the debris scratched on the rim surface and the fallen debris from molecular spectrum perspective. Raman imaging analyses MNP from hundreds to thousands of spectra rather than from a single spectrum or peak, enhancing the signal-to-noise ratio statistically and providing morphological information for quantification. The confocal Raman-based 3D structure mapping of MNP may be susceptible to false images, which can be improved through terrain mapping. Additionally, the weak signal of nanoplastics can be enhanced by reducing scanning pixel size and deconvoluting with surface-fitting algorithm. Consequently, we estimate that approximately 5(±3) MNP per millimetre along the ziplock length may be released during each closure/opening process. Given the use of these plastic bags for food storage, this level of contamination is concerning, warranting careful risk assessment alongside other potential sources of plastic items used in our kitchens. Overall, Raman imaging can be effectively analyse MNP and more broadly nanomaterials, with help of algorithms and SEM.","PeriodicalId":484840,"journal":{"name":"Nano express","volume":"93 18","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141267747","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

Role of nano-bio-composites in the sustainable agriculture: a review 纳米生物复合材料在可持续农业中的作用：综述

Nano express Pub Date : 2024-06-04 DOI: 10.1088/2632-959x/ad53e9

Saket Jha, S. Shukla, Anand Pandey, Ravikant Singh, Ajay Kumar Tiwari, Ashutosh Pathak, Abhishek Bhardwaj, Abhimanyu Kumar Singh, A. Dikshit

{"title":"Role of nano-bio-composites in the sustainable agriculture: a review","authors":"Saket Jha, S. Shukla, Anand Pandey, Ravikant Singh, Ajay Kumar Tiwari, Ashutosh Pathak, Abhishek Bhardwaj, Abhimanyu Kumar Singh, A. Dikshit","doi":"10.1088/2632-959x/ad53e9","DOIUrl":"https://doi.org/10.1088/2632-959x/ad53e9","url":null,"abstract":"\u0000 Rapidly increasing population, the demand for food has increased substantially. To overcome food deficits, an increase in agricultural production is needed, and for sustainability, the qualities of crops as well as maintaining the fertility of the soil are challenging situations. Soil contains limited amount of macro, micronutrients and innumerable amounts of soil microflora, which helps in crop production. Since the mid-19th century, a plethora of chemical fertilizers have been extensively used to improve crop production, but over time, they have shown disastrous effects on the soil composition and profile. In the current alarming scenario, a new technology are arising, namely nanotechnology, in the field of agriculture. Nano-chemicals can play a paramount role in sustainable agriculture. This review summarizes a variety of nanomaterials as pesticide, fertilizers and control of attack of fungus and bacterial diseases. Here discussed a range of nanomaterialsincludingAg, Fe, Cu, Si, Se, Al, Zn, ZnO, TiO2 and carbon nanotubes non-propitious effectsof biomagnification.This review alsodiscussesthe several mechanisms which show how nanomaterials does work as nanofertilizer, nano pesticides, and control bacterial and fungal diseases along with the advantages and disadvantages in the sustainable approach of agriculture. Furthermore, it discusses the synergistic effect of nanomaterials and conventional approach involved in agriculture practices. Nano-fertilizers and nano-biofertilizers are new tools that have evolved for the sustainable agricultural and food security.","PeriodicalId":484840,"journal":{"name":"Nano express","volume":"4 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141266813","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

Solution processed CuInS2/SnO2 heterojunction based self-powered photodetector for UV encrypted visible light communication 基于溶液处理 CuInS2/SnO2 异质结的自供电光电探测器，用于紫外加密可见光通信

Nano express Pub Date : 2024-05-24 DOI: 10.1088/2632-959x/ad5034

Harshit Sharma, Aditya Yadav, Lalit Goswami, Ankur Rana, Divya Kaushik, G. Gupta, Ritu Srivastava

{"title":"Solution processed CuInS2/SnO2 heterojunction based self-powered photodetector for UV encrypted visible light communication","authors":"Harshit Sharma, Aditya Yadav, Lalit Goswami, Ankur Rana, Divya Kaushik, G. Gupta, Ritu Srivastava","doi":"10.1088/2632-959x/ad5034","DOIUrl":"https://doi.org/10.1088/2632-959x/ad5034","url":null,"abstract":"\u0000 A photodetector (PD) featuring dual-band detection capability and self-powering attributes is crucial for various applications in sensing, communication, and imaging. Here, we present a self-powered PD based on a solution-processed CuInS2/SnO2 heterojunction capable of detecting UV and visible light spectra. The CuInS2 layer was composed of ∼2nm-sized quantum dots (QDs) synthesized using the hot injection method, while the SnO2 layer was fabricated using a straightforward solgel technique. This self-powered PD displayed a significant spectral response across both ultraviolet (UV) (355nm) and visible light (532nm) ranges, all accomplished without the need for external bias. The PD demonstrates rapid detection, with rise and decay times of 125ms and 156ms for visible light and 85ms and 200ms for UV light, respectively, at a power level of 15mW. The PD achieved responsivity values of 10.66µA/W and 34.56µA/W for visible and UV light, respectively. The impressive capability for dual-band detection in both ultraviolet (UV) and visible light showcases the practical feasibility and utility of this device for self-powered photodetection and deciphering UV-encrypted visible light communication. Moreover, its straightforward solution-based processing attribute renders it valuable for the mass production of devices and technology.","PeriodicalId":484840,"journal":{"name":"Nano express","volume":"11 48","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141098780","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

Concurrent analysis of electronic and ionic nanopore signals: blockade mean and height 同时分析电子和离子纳米孔信号：阻塞平均值和高度

Nano express Pub Date : 2024-05-20 DOI: 10.1088/2632-959x/ad4dbf

Ángel Díaz Carral, Martín Roitegui, Ayberk Koc, M. Ostertag, Maria Fyta

引用次数: 0

Water adsorption kinetics on graphene controlled by surface modification of supporting substrates 石墨烯上的水吸附动力学受支撑基底的表面改性控制

Nano express Pub Date : 2024-05-20 DOI: 10.1088/2632-959x/ad4dbe

Takumu Hirose, Naoto Ochi, Ryo Nouchi

引用次数: 0

Functionalization of silver nanoparticles coating cotton fabrics through hydrothermal synthesis for improved antimicrobial properties 通过水热合成将银纳米粒子功能化，涂覆在棉织物上，提高抗菌性能

Nano express Pub Date : 2024-04-25 DOI: 10.1088/2632-959x/ad437b

Pises Tooklang, Sasiporn Audtarat, Konkanok Chaisen, Jaruwan Thepsiri, A. Chingsungnoen, Pongsak Jittabut, T. Dasri