Nanoscale Advances最新文献

{"title":"Lattice thermal conductivity and phonon properties of polycrystalline graphene.","authors":"Kunwar Abhikeern, Amit Singh","doi":"10.1039/d4na00772g","DOIUrl":"https://doi.org/10.1039/d4na00772g","url":null,"abstract":"<p><p>Using the spectral energy density method, we predict the phonon scattering mean lifetimes of polycrystalline graphene (PC-G) having polycrystallinity only along the <i>x</i>-axis with seven different misorientation (tilt) angles at room temperature. Contrary to other studies on PC-G samples, our results indicate a strong dependence of the thermal conductivity (TC) on the tilt angles which we attribute to careful preparation of our grain boundaries-based samples without introducing any local strains and ensuring periodic boundary conditions for the supercells along the <i>x</i> and <i>y</i> axes. We also show that the square of the group velocity components along <i>x</i> and <i>y</i> axes and the phonon lifetimes are uncorrelated and the phonon density of states are almost the same for all samples with different tilt angles. Further, a distribution of the group velocity component along <i>x</i> or <i>y</i> axis as function of normal frequency is found to be exponentially decaying whereas that of the phonon lifetime showed piecewise constant function behavior with respect to the frequency. We provide parameters for these distribution functions and suggest another measure of the TC based on these distributions. Finally, we perform a size-dependent analysis for two tilt angles, 21.78° and 32.20°, and find that bulk TC components decrease by around 34% to 62% in comparison to the bulk TC values of the pristine graphene. Our analysis reveals intriguing insights into the interplay between grain orientation, phonon scattering and thermal conductivity in graphene.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":" ","pages":""},"PeriodicalIF":4.6,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11694767/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142932358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A sustainable approach using natural phosphates impregnated with nickel hydroxide nanoparticles: a cost-effective solution for alcohol oxidation'","authors":"Sanaa Chemchoub, Anas El Attar, Abdessamad Belgada, Saad Alami Younssi, Charafeddine Jama, Fouad Bentiss and Mama El Rhazi","doi":"10.1039/D4NA00850B","DOIUrl":"10.1039/D4NA00850B","url":null,"abstract":"<p >This study introduces a novel and effective approach for the electrocatalytic oxidation of alcohols, showcasing the development of a highly active and cost-effective anode catalyst for methanol and ethanol. A dual-embedded Ni electrode, named (Ni@NATPhos/Ni), is based on a carbon paste electrode modified with natural phosphate impregnated with nickel ions. A layer of nickel nanoparticles was then added <em>via</em> electrochemical deposition, using a precise combination of wet impregnation and potentiostatic electrodeposition techniques. Characterization using XRD and TEM revealed the formation of crystalline structures such as nickel pyrophosphate (Ni<small>₂</small>P<small>₂</small>O<small>₇</small>) and orthophosphate (Ni<small>₃</small>(PO<small>₄</small>)<small>₂</small>), along with nickel hydroxides (Ni(OH)<small>₂</small>), resulting in well-distributed homogenous nickel nanosized particles of approximately 30 nm. The electrocatalytic performance of Ni@NATPhos/Ni was assessed and compared with an unmodified carbon paste electrode in alkaline media. With peak current densities of 110 mA cm<small>⁻²</small> for methanol and 83 mA cm<small>⁻²</small> for ethanol oxidation, the synthesized catalyst demonstrated significantly improved catalytic efficiency. After 500 CV cycles, the dual-embedded electrode Ni@NATPhos/Ni demonstrated excellent stability, retaining 70.33% and 61.58% of its initial current values for ethanol and methanol, respectively, and exhibiting high tolerance to intermediate species poisoning. Electrochemical impedance spectroscopy (EIS) conducted after stability testing revealed an increase in solution resistance, indicative of the complete oxidation of intermediate species in the alkaline solution. The synthesized Ni@NATPhos/Ni electrode emerges as a promising and robust catalyst for alcohol oxidation reactions, offering significant advancements in electrocatalytic efficiency and stability.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":" 2","pages":" 583-600"},"PeriodicalIF":4.6,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11622688/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142801772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis of magnetic NiFe2O4/g-C3N4 heterojunction photocatalysts for boosting dye degradation performance under visible-light irradiation†","authors":"Loan Thi To Nguyen, Anh Thi Tu Duong, Nguyen Duc Bui, Viet Thi Mai Ngo, Hai Quang Nguyen, Hang Thi Thuy Nguyen, Giang Thanh Tran and Thuan Van Tran","doi":"10.1039/D4NA00694A","DOIUrl":"10.1039/D4NA00694A","url":null,"abstract":"<p >Water pollution from dyes in wastewater is a critical global issue, as these stable organic dyes resist biodegradation, posing serious threats to aquatic ecosystems. To address this situation, advanced photocatalysts have been developed. Here, NiFe<small>₂</small>O<small>₄</small>/g-C<small>₃</small>N<small>₄</small> was synthesized for the photocatalytic degradation of Rhodamine B (RhB) dye in the presence of H<small>₂</small>O<small>₂</small> and visible light. Physicochemical analysis results showed NiFe<small>₂</small>O<small>₄</small> nanoparticles dispersed in the g-C<small>₃</small>N<small>₄</small> matrix, with an upward trend in the saturation magnetization of CNF<em>x</em> as NiFe<small>₂</small>O<small>₄</small> content rose. The surface area of CNF30 was 62.3 m<small>²</small> g<small>⁻¹</small>, outperforming both NiFe<small>₂</small>O<small>₄</small> (23.2 m<small>²</small> g<small>⁻¹</small>) and g-C<small>₃</small>N<small>₄</small> (48.5 m<small>²</small> g<small>⁻¹</small>). NiFe<small>₂</small>O<small>₄</small>/g-C<small>₃</small>N<small>₄</small> could be reused up to four cycles, and efficiently catalyzed the degradation of nearly 98% RhB dye, showing a decreased rate of up to 95% COD. Through scavenger studies, the main role of ˙OH was demonstrated. Therefore, highly efficient and recyclable NiFe<small>₂</small>O<small>₄</small>/g-C<small>₃</small>N<small>₄</small> can be a potential photocatalyst for degradation of dyes.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":" 2","pages":" 536-548"},"PeriodicalIF":4.6,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11619115/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142801352","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sequence-controlled divergent supramolecular assembly of polyproline helices into metallo-peptide nanoparticles†","authors":"Dominic F. Brightwell, Kushal Samanta, Julie A. Watts, Michael W. Fay and Aniello Palma","doi":"10.1039/D4NA00762J","DOIUrl":"10.1039/D4NA00762J","url":null,"abstract":"<p >The field of peptide based supramolecular biomaterials is fast evolving. These types of constructs have been shown to find applications in the fields of bioimaging, drug delivery and scaffolds for chemical reactions. However, the community typically focuses on the use of two specific classes of structured peptides: α-helices and β-sheets, clearly neglecting a unique peptide secondary structure: the polyproline helix. Herein, we report the first design, synthesis and characterization of polyproline based metallo-peptide nanoparticles. We demonstrate that rationally engineered polyproline helices can assemble in a divergent manner, into two types of nanoparticles. We also demonstrate that the primary sequence of the functionalised polyproline peptide is crucial to ensure a controlled assembly. This work clearly demonstrates that polyproline helices can be a powerful tool to achieve supramolecular assemblies of complex and responsive bioinspired nanomaterials.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":" 1","pages":" 94-98"},"PeriodicalIF":4.6,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11626207/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142807105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Expression of concern: In situ growth of N-doped carbon nanotubes from the products of graphitic carbon nitride etching by nickel nanoparticles","authors":"Mariusz Pietrowski, Emilia Alwin, Michał Zieliński, Sabine Szunerits, Agata Suchora and Robert Wojcieszak","doi":"10.1039/D4NA90119C","DOIUrl":"10.1039/D4NA90119C","url":null,"abstract":"<p >Expression of concern for ‘<em>In situ</em> growth of N-doped carbon nanotubes from the products of graphitic carbon nitride etching by nickel nanoparticles’ by Mariusz Pietrowski <em>et al.</em>, <em>Nanoscale Adv.</em>, 2024, <strong>6</strong>, 1720–1726, https://doi.org/10.1039/D3NA00983A.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":" 1","pages":" 370-370"},"PeriodicalIF":4.6,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11618587/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142800977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Flow synthesis and multidimensional parameter screening enables exploration and optimization of copper oxide nanoparticle synthesis†","authors":"Neal Munyebvu, Zarina Akhmetbayeva, Steven Dunn and Philip D. Howes","doi":"10.1039/D4NA00839A","DOIUrl":"10.1039/D4NA00839A","url":null,"abstract":"<p >Copper-based nanoparticles (NPs) are highly valued for their wide-ranging applications, with particular significance in CO<small>₂</small> reduction. However current synthesis methods encounter challenges in scalability, batch-to-batch variation, and high energy costs. In this work, we describe a novel continuous flow synthesis approach performed at room temperature to help address these issues, producing spherical, colloidally stable copper(<small>II</small>) oxide (CuO) NPs. This approach leverages stabilizing ligands like oleic acid, oleylamine, and soy-lecithin, a novel choice for CuO NPs. The automated flow platform facilitates facile, real-time parameter screening of Cu-based nanomaterials using optical spectroscopy, achieving rapid optimization of NP properties including size, size dispersity, and colloidal stability through tuning of reaction parameters. This study highlights the potential of continuous flow synthesis for efficient parameter exploration to accelerate understanding, optimization, and eventually enable scale-up of copper-based NPs. This promises significant benefits for various sectors, including energy, healthcare, and environmental conservation, by enabling reliable production with reduced energy and cost requirements.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":" 2","pages":" 495-505"},"PeriodicalIF":4.6,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11613990/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142780615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electromigration-driven linear actuator operations of Co nanorods inside and outside multi-walled carbon nanotubes with stroke of tens of nanometers.","authors":"Shogo Matsuyama, Hideo Kohno","doi":"10.1039/d4na00766b","DOIUrl":"10.1039/d4na00766b","url":null,"abstract":"<p><p>Solid Co nanorod fillers were pushed out of multi-walled carbon nanotubes <i>via</i> electromigration and their behaviors were observed <i>in situ</i> by transmission electron microscopy. When a solid Co nanorod was pushed out, the portion outside the nanotube increased in diameter. The behavior of the plastic deformation depended on the crystal orientation of the Co nanorod filler. When the direction of the electron flow was reversed, the Co nanorod was pulled into the host nanotube. In one trial, the Co nanorod was split into two portions inside the nanotube near one of the electrodes.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":" ","pages":"784-789"},"PeriodicalIF":4.6,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11632803/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142818476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Carbon nanotube growth catalyzed by metal nanoparticles formed via the seed effect of metal clusters†","authors":"Tatsuya Moriai, Takamasa Tsukamoto, Kaori Fukuhara, Takane Imaoka, Tetsuya Kambe and Kimihisa Yamamoto","doi":"10.1039/D4NA00740A","DOIUrl":"10.1039/D4NA00740A","url":null,"abstract":"<p >Carbon nanotubes (CNTs) are useful nanomaterials owing to their distinct functions that depend on their structure and diameter; therefore, CNTs have recently attracted much attention. Catalytic chemical vapor deposition using metal nanoparticles as catalysts is one of the most useful methods for synthesizing CNTs. However, fine control of the CNT diameter has been technically difficult at the 1 nanometer level owing to the size distribution of metal nanoparticles and the difficulty in suppressing their aggregation during the CNT growth reaction. In this study, we developed a method for simultaneously conducting nanoparticle formation and CNT growth through the <em>in situ</em> preparation of nanoparticles using highly dispersed metal clusters on a support substrate as seeds. In this method, the migration and aggregation behavior of seed metal clusters on a substrate upon heating uniformly induces nanoparticle formation until nanoparticles are enlarged to suitable size for CNT growth, and then CNTs grow with a diameter corresponding to that of the nanoparticles. The nanoparticle size does not change afterward by spatial separation of the nanoparticles from the substrate due to the tip-growth mechanism of CNTs. Detailed analysis focusing on cobalt as a catalyst demonstrated that the diameters of the multi-walled CNTs could be simply tuned solely by modifying the reaction temperature and time. This result reveals that the synthetic concept using the seed clusters enables the control of the CNT size to a certain extent using only temperature control (thermal energy), without conventional separation processes for synthesizing nanoparticles and determining conditions to retain nanoparticle size.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":" 1","pages":" 346-353"},"PeriodicalIF":4.6,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11609971/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142770334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enzyme-free detection of creatinine as a kidney dysfunction biomarker using TiO2 flow-through membranes†","authors":"Nilem Khaliq, Ghafar Ali, Muhammad Asim Rasheed, Maaz Khan, Wazir Muhammad, Patrik Schmuki and Shafqat Karim","doi":"10.1039/D4NA00562G","DOIUrl":"10.1039/D4NA00562G","url":null,"abstract":"<p >TiO<small>₂</small> nanotube flow-through membranes (TNTsM) were fabricated <em>via</em> anodization of Ti foil and explored as a biosensing platform for creatinine detection. The electrodes were prepared in different configurations including TNT membrane with top surface up (TNTsMTU/TNPs/FTO), TNT membrane with bottom surface up (TNTsMBU/TNPs/FTO), TNT membrane with top surface up containing nanograss (TNTsMNG/TNPs/FTO), and TNTs/NPs/FTO and TiO<small>₂</small> nanoparticles (TNPs) film on fluorine doped tin oxide (TNPs/FTO). Electrochemical studies depict the higher electrochemical activity (sensitivity ∼19.88 μA μM<small>⁻¹</small> cm<small>⁻²</small>) of TNTsMTU/TNPs/FTO towards creatinine compared to other configurations. This exceptional performance of the TNTsMTU/TNPs/FTO electrode results from the flow-through nature of TNTsM and the removal of the bottom oxide barrier layer through etching in H<small>₂</small>O<small>₂</small>. The underlying layer of TiO<small>₂</small> NPs also contributes to the higher current response of the TNTsMTU/TNPs/FTO. The relevance of the biosensor structural design is demonstrated by the increased amperometric response of TNTsMTU/TNPs/FTO and greater redox peak current in cyclic voltammograms. Furthermore, the higher selectivity, stability, and reproducibility of the electrode can be due to the suitable redox potential, chemical stability, and controlled fabrication process of TNT membranes.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":" 2","pages":" 643-658"},"PeriodicalIF":4.6,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11629886/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142813819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Retraction: Unique and outstanding catalytic behavior of a novel MOF@COF composite as an emerging and powerful catalyst in the preparation of 2,3-dihydroquinazolin-4(1H)-one derivatives","authors":"Mohammad Ali Ghasemzadeh and Boshra Mirhosseini-Eshkevari","doi":"10.1039/D4NA90124J","DOIUrl":"10.1039/D4NA90124J","url":null,"abstract":"<p >Retraction of ‘Unique and outstanding catalytic behavior of a novel MOF@COF composite as an emerging and powerful catalyst in the preparation of 2,3-dihydroquinazolin-4(1<em>H</em>)-one derivatives’ by Mohammad Ali Ghasemzadeh <em>et al.</em>, <em>Nanoscale Adv.</em>, 2023, <strong>5</strong>, 7031–7041, https://10.1039/D3NA00805C.</p>","PeriodicalId":18806,"journal":{"name":"Nanoscale Advances","volume":" 1","pages":" 372-372"},"PeriodicalIF":4.6,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11605428/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142770295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}