Nano Trends最新文献_第6页

The surface charge effects: A route to the enhancement of the piezoelectric conversion efficiency in GaN nanowires 表面电荷效应：提高氮化镓纳米线压电转换效率的途径

Nano Trends Pub Date : 2025-01-22 DOI: 10.1016/j.nwnano.2025.100082

N. Gogneau , P. Chrétien , T.K. Sodhi , Q.C. Bui , A. Chevillard , S.W. Chen , L. Couraud , L. Travers , J.C. Harmand , M. Tchernycheva , F. Houzé

{"title":"The surface charge effects: A route to the enhancement of the piezoelectric conversion efficiency in GaN nanowires","authors":"N. Gogneau , P. Chrétien , T.K. Sodhi , Q.C. Bui , A. Chevillard , S.W. Chen , L. Couraud , L. Travers , J.C. Harmand , M. Tchernycheva , F. Houzé","doi":"10.1016/j.nwnano.2025.100082","DOIUrl":"10.1016/j.nwnano.2025.100082","url":null,"abstract":"<div><div>Nanowires (NWs) have emerged as a system of interest for developing ultra-compact piezoelectric nanogenerators. In addition to their quasi-crystalline perfection and large surface-to-volume ratio, which confer them a large degree of elastic deformation and high sensitivity to applied forces, sub-100 nm-wide NWs present the particularity to exhibit specific nanometer scale properties leading to a strong modulation of their characteristics. Among these “new properties”, we can cite the modulation of the free carrier concentration due to the surface charge (SC) effects. Regarding this last property, simulations have recently established that these SCs can improve the piezoelectric response of the NWs. The in-depth understanding of the relationship between the SCs and the NW piezoelectric conversion capacities is thus now a prerequisite. In this overview, we investigate the impact of the surface in sub-100 nm-wide GaN NWs, as a function of their diameter and direct environment - two characteristics known to strongly modulate the SC influence. By using a unique advanced nano-characterization tool derived from AFM equipped with a modified Resiscope module to quantify the piezo-conversion properties of NWs, we experimentally confirm that the SCs are useful for improving the piezo-response. By adjusting the NW dimensions and/or their direct environment to take advantage of the SCs, we demonstrate average outputs up to 528 mV generated per GaN NW and strongly improved electromechanical conversion efficiency, up to 43 %. We thus highlight the importance of the proper engineering of GaN NW surfaces, allowing to maximize the piezoelectric response of the GaN NW-based nanogenerators.</div></div>","PeriodicalId":100942,"journal":{"name":"Nano Trends","volume":"9 ","pages":"Article 100082"},"PeriodicalIF":0.0,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143097194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Swift heavy ion irradiation puts InGaN/GaN multi-quantum wells on the track for efficient green light emission 快速重离子辐照使InGaN/GaN多量子阱走上了高效绿光发射的轨道

Nano Trends Pub Date : 2025-01-21 DOI: 10.1016/j.nwnano.2025.100078

M. Sall , G. Sow , A. Baillard , A. Dujarrier , L. Goodwin , J.G. Mattei , M. Sequeira , M. Peres , P. Loiko , Y. Doublet , M.P. Chauvat , C.A.P. da Costa , P. Boduch , H. Rothard , A. Braud , B. Damilano , K. Lorenz , C. Grygiel , E. Balanzat , I. Monnet

{"title":"Swift heavy ion irradiation puts InGaN/GaN multi-quantum wells on the track for efficient green light emission","authors":"M. Sall , G. Sow , A. Baillard , A. Dujarrier , L. Goodwin , J.G. Mattei , M. Sequeira , M. Peres , P. Loiko , Y. Doublet , M.P. Chauvat , C.A.P. da Costa , P. Boduch , H. Rothard , A. Braud , B. Damilano , K. Lorenz , C. Grygiel , E. Balanzat , I. Monnet","doi":"10.1016/j.nwnano.2025.100078","DOIUrl":"10.1016/j.nwnano.2025.100078","url":null,"abstract":"<div><div>InN and InGaN/GaN multi-quantum wells (MQWs) were subjected to Swift Heavy Ion (SHI) irradiation. Ion track formation was studied using transmission electron microscopy in both plane view and cross-sectional modes. InN shows a remarkable sensitivity towards track formation with a material decomposition experimentally evidenced by means of Electron Energy Loss Spectroscopy. The MQWs material shows higher stability with negligible GaN/InGaN interface intermixing along the SHI tracks. This intermixing, proposed for mitigating polarization effects in InGaN/GaN-based light emitting diodes (LED), was achieved by track-free SHI irradiation. This was combined with low temperature thermal treatment at 450 °C with the aim to both create a compositional gradient at the MQWs interfaces and preserving the material luminescence. The obtained results pave the way for the use of SHI irradiation for efficient green light emission of InGaN/GaN-based LED.</div></div>","PeriodicalId":100942,"journal":{"name":"Nano Trends","volume":"9 ","pages":"Article 100078"},"PeriodicalIF":0.0,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143097193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Towards outstanding energy-efficiency in a recyclable triboelectric nanogenerator based on a soft-rough composite material 基于软粗糙复合材料的可回收摩擦电纳米发电机的卓越能源效率

Nano Trends Pub Date : 2025-01-21 DOI: 10.1016/j.nwnano.2025.100080

Saisai Hu , Ping Su , Deyin Tao , Luhui Zhu , Aiping Chen , Dawei Gu , Mustafa Eginligil

{"title":"Towards outstanding energy-efficiency in a recyclable triboelectric nanogenerator based on a soft-rough composite material","authors":"Saisai Hu , Ping Su , Deyin Tao , Luhui Zhu , Aiping Chen , Dawei Gu , Mustafa Eginligil","doi":"10.1016/j.nwnano.2025.100080","DOIUrl":"10.1016/j.nwnano.2025.100080","url":null,"abstract":"<div><div>Energy efficiency vs. degradability of materials making up triboelectric nanogenerators (TENGs) is critical for recyclable energy sources. In this work, we first compared voltage output expectation (V<sub>exp</sub>) of contact-separation TENG consisting of two tribo-layers: paper and common plastics used in packaging (both non-biodegradable and biodegradable). Detailed analysis based on atomic force microscopy and capacitance measurements demonstrated surface roughness of soft-rough biodegradable polymers (SRBPs) is expected to yield larger V<sub>exp</sub>, predictably. A SRBP composite-based TENG was expected to show ∼7.2 times larger V<sub>exp</sub> than a hard-flat nonbiodegradable plastic, demonstrating promising charge transfer efficiency; while the measured voltage (V<sub>mea</sub>) was only 6.5% of V<sub>exp</sub>. This was unlike the other plastics, including a non-composite SRBP, (V<sub>mea</sub>/V<sub>exp</sub> ∼0.36) and the low V<sub>mea</sub>/V<sub>exp</sub> in the SRBP composite-based TENG was attributed to intrinsic material properties. Also, energy conversion efficiency in TENG-based on SRBPs was more than double of hard-flat plastics. This shows the potential of the composite SRBP-based TENG as effective energy harvester.</div></div>","PeriodicalId":100942,"journal":{"name":"Nano Trends","volume":"9 ","pages":"Article 100080"},"PeriodicalIF":0.0,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143101089","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An analytical disquisition on the nonlinear optical responses of carbon quantum dots engineered by diverse synthesis methodologies 不同合成方法工程碳量子点非线性光学响应的分析研究

Nano Trends Pub Date : 2025-01-21 DOI: 10.1016/j.nwnano.2025.100081

Rashi Mahendra Patil, Akshay Raj R, Shyamal Mondal, Tejashree Bhave, Appala Venkata Ramana Murthy

{"title":"An analytical disquisition on the nonlinear optical responses of carbon quantum dots engineered by diverse synthesis methodologies","authors":"Rashi Mahendra Patil, Akshay Raj R, Shyamal Mondal, Tejashree Bhave, Appala Venkata Ramana Murthy","doi":"10.1016/j.nwnano.2025.100081","DOIUrl":"10.1016/j.nwnano.2025.100081","url":null,"abstract":"<div><div>Carbon quantum dots (CQDs) are highly promising nanomaterials known for their unique optical and electronic properties, which are crucial for applications in photonics, bioimaging, optoelectronics, etc. This study investigates the nonlinear optical (NLO) responses of CQDs synthesized via three different methods, namely, hydrothermal, microwave-assisted, and green synthesis. The three different synthesized CQDs have shown size-dependent optical and photoluminescence properties. The z-scan technique was employed for measuring the corresponding nonlinear absorption coefficient and nonlinear refractive index. Hydrothermal synthesis produced CQDs with strong NLO responses (χ<sup>(3)</sup> = 4.14 × 10<sup>–7</sup> esu) due to high crystallinity and significant surface functionalization, whereas microwave-assisted synthesis resulted (χ<sup>(3)</sup> = 3.97 × 10<sup>–7</sup> esu) in size-dependent NLO variability. Meanwhile, the green synthesis method, utilizing natural resources and organic precursors which replaced by chemical capping agents such as PEG, showed a moderate NLO response (χ<sup>(3)</sup> = 2.72 × 10<sup>–7</sup> esu), influenced by diverse surface functionalities. This comparative analysis emphasizes the crucial role of synthesis methods in tailoring CQDs for specific NLO applications, providing insights to optimize their synthesis for enhanced performance in advanced optical technologies.</div></div>","PeriodicalId":100942,"journal":{"name":"Nano Trends","volume":"9 ","pages":"Article 100081"},"PeriodicalIF":0.0,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143101088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Graphene and graphene quantum dots applied to batteries and supercapacitors 石墨烯和石墨烯量子点应用于电池和超级电容器

Nano Trends Pub Date : 2025-01-20 DOI: 10.1016/j.nwnano.2025.100077

Thiago F. Santos , Domingos F.S. Souza , Elisama V. Santos , Bruno R. Carvalho , J.H.O. Nascimento

{"title":"Graphene and graphene quantum dots applied to batteries and supercapacitors","authors":"Thiago F. Santos , Domingos F.S. Souza , Elisama V. Santos , Bruno R. Carvalho , J.H.O. Nascimento","doi":"10.1016/j.nwnano.2025.100077","DOIUrl":"10.1016/j.nwnano.2025.100077","url":null,"abstract":"<div><div>The article discusses the main advancements and discoveries regarding the application of graphene (Gr) and graphene quantum dots (GQDs) in batteries and supercapacitors, highlighting how these materials have revolutionized the field of energy storage. The main findings of the work include the confirmation that graphene and GQDs significantly improve the efficiency, storage capacity, and stability of energy devices. The study found that GQDs and supercapacitors made of graphene can achieve high-capacitances, such as 566 F/g, and keep up to 95% of their capacity after 2,000 charge and discharge cycles. In lithium-ion batteries, the incorporation of these nanomaterials has resulted in capacities of up to 2,882 mAh/g, demonstrating a substantial improvement in energy density and battery lifespan. The study also identified the most effective synthesis methods, such as chemical oxidation and hydrothermal processes, and optimized them to produce high-quality graphene and GQDs, thereby directly impacting the devices' performance. The study also revealed that the integration of graphene and GQDs is driving the exponential growth of the supercapacitor and battery market, projected to reach values of up to 18.4 billion dollars and 500.5 billion dollars, respectively, by 2032. The article concludes that these materials play a fundamental role in the evolution of energy storage technologies, with the potential to shape the future of energy sustainability and technological innovation.</div></div>","PeriodicalId":100942,"journal":{"name":"Nano Trends","volume":"9 ","pages":"Article 100077"},"PeriodicalIF":0.0,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143101085","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Advancements in artificial synapses: The role of fluorite–structured ferroelectrics 人工突触的进展：萤石结构铁电体的作用

Nano Trends Pub Date : 2025-01-18 DOI: 10.1016/j.nwnano.2025.100074

P.R. Sekhar Reddy

引用次数: 0

Assessment of head dynamics using a flexible self-powered sensor and machine learning, capable of predicting probability of brain injury 使用灵活的自供电传感器和机器学习评估头部动力学，能够预测脑损伤的概率

Nano Trends Pub Date : 2025-01-15 DOI: 10.1016/j.nwnano.2025.100076

Gerardo L. Morales-Torres, Ian González-Afanador, Luis A. Colón-Santiago, Nelson Sepúlveda

{"title":"Assessment of head dynamics using a flexible self-powered sensor and machine learning, capable of predicting probability of brain injury","authors":"Gerardo L. Morales-Torres, Ian González-Afanador, Luis A. Colón-Santiago, Nelson Sepúlveda","doi":"10.1016/j.nwnano.2025.100076","DOIUrl":"10.1016/j.nwnano.2025.100076","url":null,"abstract":"<div><div>This work presents the application of a flexible, self-powered sensor designed to predict angular velocity and acceleration during head kinematics associated with concussions. This paper-thin, flexible device, which exhibits piezoelectric-like properties, is strategically placed on the back of a human head substitute to capture stress and strain in this region during whiplash events. The mechanical energy generated by varying magnitudes of whiplash is converted into electrical pulses, which are then integrated with multiple machine learning models. These models were tested and compared, demonstrating their ability to accurately predict angular velocity and acceleration of the head. This predictive capability can be utilized to assess the probability of brain injury. The findings demonstrate that this system not only enhances the understanding of head impact dynamics, but also opens avenues for developing more effective injury risk assessment tools. By combining innovative sensor technology with advanced machine learning techniques, this study contributes to improved safety monitoring in high-risk environments, such as high-contact and automotive sports.</div></div>","PeriodicalId":100942,"journal":{"name":"Nano Trends","volume":"9 ","pages":"Article 100076"},"PeriodicalIF":0.0,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143101084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exploring the impact of modulation of electronic structure via doping in the realm of environmental applications 探索通过掺杂调制电子结构在环境应用领域的影响

Nano Trends Pub Date : 2025-01-09 DOI: 10.1016/j.nwnano.2025.100075

U Sandhya Shenoy , Bhava Amin , D Krishna Bhat

{"title":"Exploring the impact of modulation of electronic structure via doping in the realm of environmental applications","authors":"U Sandhya Shenoy , Bhava Amin , D Krishna Bhat","doi":"10.1016/j.nwnano.2025.100075","DOIUrl":"10.1016/j.nwnano.2025.100075","url":null,"abstract":"<div><div>Engineering the electronic structure of a material is quite a fascinating field of study as it not only helps in improving the performance of the material but also helps us understand why a particular combination of elements exhibits the properties it does. Substitutional doping has been receiving increasing interest in the field of photocatalysis for boosting the performance of the material by tuning its crystal structure and electronic structure. In this study, we report the effect of site occupancy of silver in Ag doped BaTiO<sub>3</sub>. First principles density functional theory calculations highlight that the Ti site which is the preferred site in BaTiO<sub>3</sub> for most of the dopants is not so preferred in the case of Ag doping for enhancing the photocatalytic activity. It also reveals the exceptional behavior of Ag where in it prevents the formation of mid gap recombination centers in the case of mixed occupancy. Doped samples synthesized through solvothermal approach with directed doping shows activity of 99.2 % and 99 % degradation of rose bengal and malachite green dyes in 40 and 50 min, respectively.</div></div>","PeriodicalId":100942,"journal":{"name":"Nano Trends","volume":"9 ","pages":"Article 100075"},"PeriodicalIF":0.0,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143097184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

DFT investigations of structural and electronic properties of two-dimensional Y2C and Y2CF2 monolayers 二维Y2C和Y2CF2单层结构和电子性质的DFT研究

Nano Trends Pub Date : 2025-01-03 DOI: 10.1016/j.nwnano.2025.100073

Zainab Ali Abed Alhasani , Fouad N. Ajeel

{"title":"DFT investigations of structural and electronic properties of two-dimensional Y2C and Y2CF2 monolayers","authors":"Zainab Ali Abed Alhasani , Fouad N. Ajeel","doi":"10.1016/j.nwnano.2025.100073","DOIUrl":"10.1016/j.nwnano.2025.100073","url":null,"abstract":"<div><div>We designed Y<sub>2</sub>CF<sub>2</sub> monolayers by adding fluorine atoms in place of the anionic electrons in Y<sub>2</sub>C monolayers. The density functional theory (DFT) is used to investigate the structural and electronic properties of two-dimensional Y<sub>2</sub>C and Y<sub>2</sub>CF<sub>2</sub> monolayers. According to the results of calculations, these monolayers are dynamically and thermodynamically stable. The structural and electronic properties of the Y<sub>2</sub>CF<sub>2</sub> monolayer exhibit a semimetallic behavior. To study the potential applications of these new two-dimensional electride material, the adsorption and diffusion properties to atoms <span><math><mtext>Li</mtext></math></span>, <span><math><mtext>Na</mtext></math></span>, and <span><math><mtext>Mg</mtext></math></span> are investigated. Our results indicate that the diffusion barriers of Li, Na, and Mg atoms on the Y₂CF₂ surface are 15.9 eV, 6.8 eV, and 28.6 eV, respectively. Because of their high adsorption energies and low diffusion barriers of metal atoms, Y<sub>2</sub>C and Y<sub>2</sub>CF<sub>2</sub> monolayers are attractive electride materials for applications of metal-ion batteries. All of the findings contribute to the modification, stabilization, and understanding of two-dimensional electrides, as well as the practical use of their characteristics.</div></div>","PeriodicalId":100942,"journal":{"name":"Nano Trends","volume":"9 ","pages":"Article 100073"},"PeriodicalIF":0.0,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143097191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Scrutinization of chemical reactions, permeability, and magnetic field of a dissipative flow effects of Silver (Ag) nanoparticles – Water over a moving vertical porous medium 银纳米粒子的化学反应、磁导率和磁场的耗散流动效应——水在移动的垂直多孔介质上

Nano Trends Pub Date : 2025-01-03 DOI: 10.1016/j.nwnano.2025.100072

Joseph N. Lutera , MN Raja Shekar , B Shankar Goud

{"title":"Scrutinization of chemical reactions, permeability, and magnetic field of a dissipative flow effects of Silver (Ag) nanoparticles – Water over a moving vertical porous medium","authors":"Joseph N. Lutera , MN Raja Shekar , B Shankar Goud","doi":"10.1016/j.nwnano.2025.100072","DOIUrl":"10.1016/j.nwnano.2025.100072","url":null,"abstract":"<div><div>Incompressible nanofluid flow applications have recently drawn significant attention among scientists and engineers. The dimensionless leading comparisons of this study are analytically executed using the Laplace transformation technique and graphically analyzed through the MATLAB software tool. The silver nanoparticles-water thermophysical properties framed this exploration setting. This study finds that magnetic activity slows down the speed of the nanofluid flow. The solutes are consumed during the chemical reaction process, declining the concentration of species. The augmentation in solid volume fraction sinks the velocity and upsurges the nanofluid's flow temperature. The permeability and thermal radiation constraints enhance the skin friction coefficient. These results provide valuable insights into designing and controlling mass and heat transmission in nanofluid-based schemes, such as creating heat exchangers, cooling schemes, electrochemical systems, and filtration processes in industries. It is also applicable in the health sector, for instance, by using a magnetic field to control the targeted area for drug injection in the human body.</div></div>","PeriodicalId":100942,"journal":{"name":"Nano Trends","volume":"9 ","pages":"Article 100072"},"PeriodicalIF":0.0,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143097185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0