Yusong Ding, Fangming Lian, Yi Tao, Hao Cheng, Yun Dong
The adhesion properties of liquid-solid interfaces are of fundamental importance in performance and design of nanodevices. Modulating interfacial thermal transport has the potential to enhance interfacial heat dissipation in nanodevices. Here, the adhesive characteristics of the liquid-solid interface formed by liquid-Al/graphene are reported using molecular dynamics, and the intrinsic mechanism of interfacial adhesion evolution and energy heat transport is revealed. Specifically, an increase in temperature significantly reduces the adhesion and thermal transport capacity. Concurrently, the expansion of vacancy defects strengthens the interfacial adhesion property. This is due to the fact that the enlarged vacancy defects enhance the local contact and interfacial thermal conductance (ITC) between the atoms, thereby optimizing interfacial energy transport. The augmented ITC facilitates interfacial energy heat exchange and phonon participation rate (PPR), thus increases interfacial phonon modes and further reinforces the adhesion force. This paper elucidates the evolution of interfacial adhesion characteristics of liquid-Al/graphene, providing substantial guidance for a more comprehensive understanding of energy transport at the liquid-solid interface.
{"title":"Disclosing the Contribution of Vacancy Defects to Thermal Transport at liquid-Al/Graphene Adhesion Interface","authors":"Yusong Ding, Fangming Lian, Yi Tao, Hao Cheng, Yun Dong","doi":"10.1039/d4nr03590a","DOIUrl":"https://doi.org/10.1039/d4nr03590a","url":null,"abstract":"The adhesion properties of liquid-solid interfaces are of fundamental importance in performance and design of nanodevices. Modulating interfacial thermal transport has the potential to enhance interfacial heat dissipation in nanodevices. Here, the adhesive characteristics of the liquid-solid interface formed by liquid-Al/graphene are reported using molecular dynamics, and the intrinsic mechanism of interfacial adhesion evolution and energy heat transport is revealed. Specifically, an increase in temperature significantly reduces the adhesion and thermal transport capacity. Concurrently, the expansion of vacancy defects strengthens the interfacial adhesion property. This is due to the fact that the enlarged vacancy defects enhance the local contact and interfacial thermal conductance (ITC) between the atoms, thereby optimizing interfacial energy transport. The augmented ITC facilitates interfacial energy heat exchange and phonon participation rate (PPR), thus increases interfacial phonon modes and further reinforces the adhesion force. This paper elucidates the evolution of interfacial adhesion characteristics of liquid-Al/graphene, providing substantial guidance for a more comprehensive understanding of energy transport at the liquid-solid interface.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"4 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142685029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jiaxin Sun, Wenjie Xu, Yixiang Liu, Bin Sun, Jie Xiong, Yongfu Lian, Yanhui Lou, Lai Feng
Carbon dots (CDs) have been of great interest due to their high potential in optoelectronic applications. Although various CDs have been synthesized via the “bottom-up” pathway, fewer focused on understanding the origins of the structural and optical diversities of CDs. In this work, two benzenoid acids with a slight structural variation (i.e., 9-oxo-9H-fluorene-2,7-dicarboxylic acid (FR) and 4,4'-biphenyl dicarboxylic acid (BP)) are employed as precursors, yielding orange and red-emissive CDs, respectively, with quantum yields of 43.1 ~ 30.9%. A combined experimental and theoretical study reveals that these CDs’ structural and optical diversities originate from the structural variation of precursors. Furthermore, we demonstrate that the light-emitting diodes (LEDs) based on the blended emissive layer of poly(N-vinyl carbazole) (PVK) and CDs display cyan and yellow lights, respectively, with moderate turn-on voltages of 4.0/4.5 V and maximum luminances of 454/276 cd m-2. Such different optoelectronic performances could be attributable to the different energy-level alignments of CDs-FR and CDs-BP. This study thus provides a typical example to understand the precursor-dependent diversities of CDs, which may contribute to the rational screening of precursors towards the CDs with desirable optical/optoelectronic properties.
{"title":"Precursor Engineering towards Orange and Red-Emissive Carbon Dots for LEDs with Tunable Emission Colors","authors":"Jiaxin Sun, Wenjie Xu, Yixiang Liu, Bin Sun, Jie Xiong, Yongfu Lian, Yanhui Lou, Lai Feng","doi":"10.1039/d4nr03184a","DOIUrl":"https://doi.org/10.1039/d4nr03184a","url":null,"abstract":"Carbon dots (CDs) have been of great interest due to their high potential in optoelectronic applications. Although various CDs have been synthesized via the “bottom-up” pathway, fewer focused on understanding the origins of the structural and optical diversities of CDs. In this work, two benzenoid acids with a slight structural variation (i.e., 9-oxo-9H-fluorene-2,7-dicarboxylic acid (FR) and 4,4'-biphenyl dicarboxylic acid (BP)) are employed as precursors, yielding orange and red-emissive CDs, respectively, with quantum yields of 43.1 ~ 30.9%. A combined experimental and theoretical study reveals that these CDs’ structural and optical diversities originate from the structural variation of precursors. Furthermore, we demonstrate that the light-emitting diodes (LEDs) based on the blended emissive layer of poly(N-vinyl carbazole) (PVK) and CDs display cyan and yellow lights, respectively, with moderate turn-on voltages of 4.0/4.5 V and maximum luminances of 454/276 cd m-2. Such different optoelectronic performances could be attributable to the different energy-level alignments of CDs-FR and CDs-BP. This study thus provides a typical example to understand the precursor-dependent diversities of CDs, which may contribute to the rational screening of precursors towards the CDs with desirable optical/optoelectronic properties.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"26 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2024-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142685031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Correction for ‘A multifunctional black phosphorus nanosheet-based immunomagnetic bio-interface for heterogeneous circulating tumor cell capture and simultaneous self-identification in gastric cancer patients’ by Yifan Zuo et al., Nanoscale, 2023, 15, 3872–3883, https://doi.org/10.1039/D2NR04277K.
{"title":"Correction: A multifunctional black phosphorus nanosheet-based immunomagnetic bio-interface for heterogeneous circulating tumor cell capture and simultaneous self-identification in gastric cancer patients","authors":"Yifan Zuo, Yi Xia, Wenwen Lu, Yue Li, Yang Xiao, Shuai Gao, Zhiyi Zhou, Hao Xu, Xingqing Feng, Chenglin Li, Yanyan Yu","doi":"10.1039/d4nr90203c","DOIUrl":"https://doi.org/10.1039/d4nr90203c","url":null,"abstract":"Correction for ‘A multifunctional black phosphorus nanosheet-based immunomagnetic bio-interface for heterogeneous circulating tumor cell capture and simultaneous self-identification in gastric cancer patients’ by Yifan Zuo <em>et al.</em>, <em>Nanoscale</em>, 2023, <strong>15</strong>, 3872–3883, https://doi.org/10.1039/D2NR04277K.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"14 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
As foreseeable fuel, getting hydrogen from water can be the game changer promise for renewable energy sector. Reason is that it has potential to be used as alternative to the fossil fuels. Current project has been designed to develop catalysts that can produce hydrogen from water on sunlight. For the purpose, CdS, Cu/CdS, Pd/CdS, and Cu‒Pd/CdS catalysts have been successfully synthesised and utilized for hydrogen generation. Catalytic activity of pristine CdS has been potentially enhanced with Cu and Pd cocatalysts that were deposited via chemical reduction strategy. Morphology and optical characteristics have been assessed via XRD, Raman, UV-Vis/DRS, PL, SEM, HRTEM and AFM techniques. Phase purity, compositions and charge transfer have been confirmed by EDX, XPS and EIS studies. Using similar conditions, photoreactions and H2 evolution experiments were performed in quartz reactor (UK/Velp-Sci) and GC-TCD (Shimadzu, 2014) respectively. Overall, Cu‒Pd/CdS catalyst (0.2% Cu and 0.8% Pd) was found most active that has potentially delivered 33.71 mmolg‒1h‒1 of hydrogen. Higher efficiencies were attributed to the existence of Cu and Pd on CdS surfaces. It has been predicted that Cu cocatalysts increase the electron densities on CdS surfaces (i.e. active sites), while Pd cocatalysts reduce the back reactions (higher charge transportation) by forming Schottky junctions. Various factors like pH, temperature, intensity of light and catalyst dose have been evaluated and discussed. Based on the results and activities, it has been concluded that ascribed approach hold potential to replace the fossil fuels.
作为一种可预见的燃料，从水中获取氢气可以改变可再生能源领域的游戏规则。原因是它有可能成为化石燃料的替代品。目前的项目旨在开发能在阳光下从水中制氢的催化剂。为此，已成功合成并利用 CdS、Cu/CdS、Pd/CdS 和 Cu-Pd/CdS 催化剂制氢。通过化学还原策略沉积的 Cu 和 Pd 助催化剂增强了原始 CdS 的催化活性。通过 XRD、Raman、UV-Vis/DRS、PL、SEM、HRTEM 和 AFM 技术对形态和光学特性进行了评估。EDX、XPS 和 EIS 研究证实了相纯度、组成和电荷转移。利用类似的条件，分别在石英反应器（UK/Velp-Sci）和 GC-TCD （岛津，2014 年）中进行了光反应和 H2 演化实验。总体而言，Cu-Pd/CdS 催化剂（0.2% Cu 和 0.8% Pd）的活性最高，可提供 33.71 mmolg-1h-1 的氢气。效率较高的原因是 CdS 表面存在 Cu 和 Pd。据预测，铜助催化剂会增加 CdS 表面（即活性位点）的电子密度，而钯助催化剂则会通过形成肖特基结来减少逆反应（更高的电荷传输）。对 pH 值、温度、光照强度和催化剂剂量等各种因素进行了评估和讨论。根据这些结果和活动，得出的结论是，上述方法具有替代化石燃料的潜力。
{"title":"Unveiling the potential of Cu‒Pd/CdS catalysts to supply and rectify electron transfer for H2 generation from water splitting†","authors":"Ejaz Hussain, Memuna Idrees, Muhammad Jalil, Zeeshan Abid, Khalid Aljohani, Khezina Rafiq","doi":"10.1039/d4nr03381g","DOIUrl":"https://doi.org/10.1039/d4nr03381g","url":null,"abstract":"As foreseeable fuel, getting hydrogen from water can be the game changer promise for renewable energy sector. Reason is that it has potential to be used as alternative to the fossil fuels. Current project has been designed to develop catalysts that can produce hydrogen from water on sunlight. For the purpose, CdS, Cu/CdS, Pd/CdS, and Cu‒Pd/CdS catalysts have been successfully synthesised and utilized for hydrogen generation. Catalytic activity of pristine CdS has been potentially enhanced with Cu and Pd cocatalysts that were deposited via chemical reduction strategy. Morphology and optical characteristics have been assessed via XRD, Raman, UV-Vis/DRS, PL, SEM, HRTEM and AFM techniques. Phase purity, compositions and charge transfer have been confirmed by EDX, XPS and EIS studies. Using similar conditions, photoreactions and H2 evolution experiments were performed in quartz reactor (UK/Velp-Sci) and GC-TCD (Shimadzu, 2014) respectively. Overall, Cu‒Pd/CdS catalyst (0.2% Cu and 0.8% Pd) was found most active that has potentially delivered 33.71 mmolg‒1h‒1 of hydrogen. Higher efficiencies were attributed to the existence of Cu and Pd on CdS surfaces. It has been predicted that Cu cocatalysts increase the electron densities on CdS surfaces (i.e. active sites), while Pd cocatalysts reduce the back reactions (higher charge transportation) by forming Schottky junctions. Various factors like pH, temperature, intensity of light and catalyst dose have been evaluated and discussed. Based on the results and activities, it has been concluded that ascribed approach hold potential to replace the fossil fuels.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"27 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The sluggish kinetics of oxygen evolution reaction (OER) are bottlenecks to develop hydrogen energy based on water electrolysis, which can be significantly improved using high performance catalyst. In this context, the CoNi layered double hydroxide (LDH)/Ti3C2 heterostructures are obtained using electrostatic attraction of the positively charged LDH and negatively charged Ti3C2 nanosheets as catalyst to optimize the OER performance. Such alternately stacking exhibits good catalytic activity with a lower overpotential and a small Tafel slope, outperforming their individual components. The results by density functional theory (DFT) simulation find that the charge transfers from Ti3C2 to CoNi LDH, not only adjust the electron distribution, but also increase the electron density of the interfacial active sites, thus enhances the electron transfer efficiency inside the heterostructures. Moreover, the Co2+ and Ni3+ ions exhibit a synergistic effect in supplying more electrons to adsorb the adjacent intermediates with the active hydrogen and oxygen vacancies, to improve the adsorption capability and reduce the reaction energy barriers. These findings provide a rewarding avenue towards the design of highly efficient electrocatalysts for OER.
氧进化反应（OER）的缓慢动力学是基于水电解开发氢能的瓶颈，而使用高性能催化剂可以显著改善这一问题。在此背景下，利用带正电荷的 LDH 和带负电荷的 Ti3C2 纳米片的静电吸引作用，获得了 CoNi 层状双氢氧化物（LDH）/Ti3C2 异质结构作为催化剂，以优化 OER 性能。这种交替堆叠表现出良好的催化活性，具有较低的过电位和较小的塔菲尔斜率，其性能优于它们的单独组分。密度泛函理论（DFT）模拟结果发现，从 Ti3C2 到 CoNi LDH 的电荷转移不仅调整了电子分布，还增加了界面活性位点的电子密度，从而提高了异质结构内部的电子传递效率。此外，Co2+ 和 Ni3+ 离子还能发挥协同作用，提供更多的电子来吸附邻近中间体的活性氢和氧空位，从而提高吸附能力并降低反应能垒。这些发现为设计用于 OER 的高效电催化剂提供了一条有益的途径。
{"title":"Tunable Heteroassembly of 2D CoNi LDH and Ti3C2 Nanosheets with Enhanced Electrocatalytic Activity for Oxygen Evolution","authors":"Xueyi Lu, Lulu Jia, Minchen Hou, Xuemin Wu, Chang Ni, Gaofei Xiao, Renzhi Ma, Xia Lu","doi":"10.1039/d4nr03679d","DOIUrl":"https://doi.org/10.1039/d4nr03679d","url":null,"abstract":"The sluggish kinetics of oxygen evolution reaction (OER) are bottlenecks to develop hydrogen energy based on water electrolysis, which can be significantly improved using high performance catalyst. In this context, the CoNi layered double hydroxide (LDH)/Ti3C2 heterostructures are obtained using electrostatic attraction of the positively charged LDH and negatively charged Ti3C2 nanosheets as catalyst to optimize the OER performance. Such alternately stacking exhibits good catalytic activity with a lower overpotential and a small Tafel slope, outperforming their individual components. The results by density functional theory (DFT) simulation find that the charge transfers from Ti3C2 to CoNi LDH, not only adjust the electron distribution, but also increase the electron density of the interfacial active sites, thus enhances the electron transfer efficiency inside the heterostructures. Moreover, the Co2+ and Ni3+ ions exhibit a synergistic effect in supplying more electrons to adsorb the adjacent intermediates with the active hydrogen and oxygen vacancies, to improve the adsorption capability and reduce the reaction energy barriers. These findings provide a rewarding avenue towards the design of highly efficient electrocatalysts for OER.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"253 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
To address the escalating demand for efficient CO2 separation technologies, we introduce novel membranes utilizing natural polymer guar gum (GG), conjugate polymer PEDOT:PSS, and bimetallic PdPt nanoparticles for efficient CO2 separation. Bimetallic PdPt nanoparticles were synthesized using the wet chemical method and characterized using X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) techniques. The fabricated membranes were characterized using various techniques for their morphology, chemical bonds, functional groups, and mechanical properties. Through meticulous fabrication and characterization, the binary blended membranes demonstrated enhanced homogeneity and smoothness in the structure, attributed to the interaction between the polymers; and superior CO2 permeability due to the amphiphilic nature of PEDOT:PSS polymer. The gas separation experiments using H2, N2, and CO2 gases, confirmed that the 20% PEDOT:PSS/GG blended membranes showed the highest performance with sufficient mechanical properties. Moreover, the results demonstrated an increment of 172% in CO2 permeability and 138% in CO2/H2 selectivity, respectively. Further, integrating bimetallic PdPt nanoparticles provided an additional 197% increment in CO2/H2 selectivity, owing to the unique catalytic activities of noble metal nanoparticles. The study not only underscores the transformative potential of polymer blending and noble metal engineering but also highlights the significance of using natural polymers towards sustainable environmental solutions.
{"title":"Bimetallic PdPt nanoparticles incorporated PEDOT:PSS/Guar gum blended membranes for enhanced CO2 separation","authors":"Nishel Saini, Gaurav Pandey, Ankit Sharma, Kamakshi Pandey, Kamlendra Awasthi","doi":"10.1039/d4nr03292f","DOIUrl":"https://doi.org/10.1039/d4nr03292f","url":null,"abstract":"To address the escalating demand for efficient CO2 separation technologies, we introduce novel membranes utilizing natural polymer guar gum (GG), conjugate polymer PEDOT:PSS, and bimetallic PdPt nanoparticles for efficient CO2 separation. Bimetallic PdPt nanoparticles were synthesized using the wet chemical method and characterized using X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) techniques. The fabricated membranes were characterized using various techniques for their morphology, chemical bonds, functional groups, and mechanical properties. Through meticulous fabrication and characterization, the binary blended membranes demonstrated enhanced homogeneity and smoothness in the structure, attributed to the interaction between the polymers; and superior CO2 permeability due to the amphiphilic nature of PEDOT:PSS polymer. The gas separation experiments using H2, N2, and CO2 gases, confirmed that the 20% PEDOT:PSS/GG blended membranes showed the highest performance with sufficient mechanical properties. Moreover, the results demonstrated an increment of 172% in CO2 permeability and 138% in CO2/H2 selectivity, respectively. Further, integrating bimetallic PdPt nanoparticles provided an additional 197% increment in CO2/H2 selectivity, owing to the unique catalytic activities of noble metal nanoparticles. The study not only underscores the transformative potential of polymer blending and noble metal engineering but also highlights the significance of using natural polymers towards sustainable environmental solutions.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"10 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Calle Preger, Lisa Rämisch, Johan Zetterberg, Sara Blomberg, Maria E Messing
Engineering on the nanoscale often involves optimizing performance by designing and creating new types of nanostructured materials. Multifunctional nanoparticles can be formed by combining elements that carry fundamentally different properties. The elements can be chosen based on the desired functionality, and by combining, e.g., magnetic, and catalytic elements, it is possible to self-assemble nanoparticles into catalytically active magnetic nanochains. However, mixing and assembling nanoparticles in a controlled way is challenging, and it is not obvious how the intermixing of the elements influences the properties of the individual nanoparticles. In this work, we synthesize and assemble intermixed magnetic and catalytic Cobalt-Palladium (Co-Pd) nanoparticles into multifunctional nanochains. The magnetic behavior is explored by studying the magnetic field-directed self-assembly of the nanoparticles into elongated nanochains. The catalytic properties are determined by measuring CO oxidation at elevated temperatures. Our results confirm that the magnetic and catalytic functionalities of the individual elements are retained when intermixed, which implies the potential to create nanochains with dual functionality that can be assembled in a controlled way.
{"title":"Magnetic field-assisted nanochain formation of intermixed catalytic Co-Pd nanoparticles.","authors":"Calle Preger, Lisa Rämisch, Johan Zetterberg, Sara Blomberg, Maria E Messing","doi":"10.1039/d4nr02643h","DOIUrl":"https://doi.org/10.1039/d4nr02643h","url":null,"abstract":"Engineering on the nanoscale often involves optimizing performance by designing and creating new types of nanostructured materials. Multifunctional nanoparticles can be formed by combining elements that carry fundamentally different properties. The elements can be chosen based on the desired functionality, and by combining, e.g., magnetic, and catalytic elements, it is possible to self-assemble nanoparticles into catalytically active magnetic nanochains. However, mixing and assembling nanoparticles in a controlled way is challenging, and it is not obvious how the intermixing of the elements influences the properties of the individual nanoparticles. In this work, we synthesize and assemble intermixed magnetic and catalytic Cobalt-Palladium (Co-Pd) nanoparticles into multifunctional nanochains. The magnetic behavior is explored by studying the magnetic field-directed self-assembly of the nanoparticles into elongated nanochains. The catalytic properties are determined by measuring CO oxidation at elevated temperatures. Our results confirm that the magnetic and catalytic functionalities of the individual elements are retained when intermixed, which implies the potential to create nanochains with dual functionality that can be assembled in a controlled way.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"74 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The controlled synthesis of Ag/Au nanocomposite particles has remained a significant challenge in nanomaterial research. This study presents the synthesis, characterization, and surface-enhanced Raman scattering (SERS) performance of silver (Ag) and gold (Au) nanostar composites. The structural and plasmonic properties of these nanocomposites were optimized by varying the molar ratios of silver nanostars (AgNSs) and gold nanostars (AuNSs). By synthesizing composite nanostars with differing AgNS/AuNS ratios, we systematically compared their optical and spectroscopic behaviors. The results demonstrated that Ag/Au nanostar composites function as highly effective SERS substrates for the detection of rhodamine 6G (R6G), with solutions tested at concentrations from 10−15 to 10−6 M. Compared to individual AgNS or AuNS substrates, the Ag/Au nanocomposites exhibited significantly enhanced SERS signals, with superior consistency and sensitivity. Notably, the nanostar composite with a 75 : 25 Ag/Au ratio showed the highest SERS performance, achieving an enhancement factor of 8.9 × 106 and a detection limit of 10−15 M for R6G. Additionally, this composite demonstrated excellent long-term stability, maintaining performance until ten weeks of storage. To our knowledge, this represents the highest sensitivity reported for R6G detection using label-free SERS. The study further provides a detailed analysis of the composition-dependent SERS activity, underscoring the potential of Ag/Au nanocomposites as advanced SERS substrates for applications in chemical and biological sensing, as well as environmental monitoring.
{"title":"An advanced plasmonic bimetallic nanostar composite for ultra-sensitive SERS detection of crystal violet","authors":"Sintayehu Leshe Kitaw, Yohannis Wondosen Ahmed, Andy Candra, Tsung-Yun Wu, Beyadgalem Endawoke Anley, Ying-Yu Chen, Yu-Ting Cheng, Kuan-Ju Chen, Chayaporn Thammaniphit, Chen Chu Hsu, Yi Ting Wu, Mahvash Hira Khan, Hsieh-Chih Tsai","doi":"10.1039/d4nr03299c","DOIUrl":"https://doi.org/10.1039/d4nr03299c","url":null,"abstract":"The controlled synthesis of Ag/Au nanocomposite particles has remained a significant challenge in nanomaterial research. This study presents the synthesis, characterization, and surface-enhanced Raman scattering (SERS) performance of silver (Ag) and gold (Au) nanostar composites. The structural and plasmonic properties of these nanocomposites were optimized by varying the molar ratios of silver nanostars (AgNSs) and gold nanostars (AuNSs). By synthesizing composite nanostars with differing AgNS/AuNS ratios, we systematically compared their optical and spectroscopic behaviors. The results demonstrated that Ag/Au nanostar composites function as highly effective SERS substrates for the detection of rhodamine 6G (R6G), with solutions tested at concentrations from 10<small><sup>−15</sup></small> to 10<small><sup>−6</sup></small> M. Compared to individual AgNS or AuNS substrates, the Ag/Au nanocomposites exhibited significantly enhanced SERS signals, with superior consistency and sensitivity. Notably, the nanostar composite with a 75 : 25 Ag/Au ratio showed the highest SERS performance, achieving an enhancement factor of 8.9 × 10<small><sup>6</sup></small> and a detection limit of 10<small><sup>−15</sup></small> M for R6G. Additionally, this composite demonstrated excellent long-term stability, maintaining performance until ten weeks of storage. To our knowledge, this represents the highest sensitivity reported for R6G detection using label-free SERS. The study further provides a detailed analysis of the composition-dependent SERS activity, underscoring the potential of Ag/Au nanocomposites as advanced SERS substrates for applications in chemical and biological sensing, as well as environmental monitoring.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"14 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The transportation of ions across cell membranes is vital in biological functions and is frequently controlled by external triggers like light, ligands, and voltage. Synthetic ion transport systems, particularly those featuring gating mechanisms, have attracted considerable interest. In this research, we engineered self-assembled barrel rosette ion channels using a photoresponsive azobenzene integrated at an allosteric site. Morphological studies verified more effective self-assembly of the trans form in contrast to the cis form. The restricted self-assembly of the cis form can be ascribed to the nonplanar structure of cis azobenzene moieties, which inhibits favorable π-π stacking interactions. The ion transport studies demonstrated the formation of ion channels by the trans form with anion antiport as the primary transport mechanism. In contrast, the cis form exhibited lower efficiency. Based on these observations, dynamically gated ion transport was achieved by employing two sets of electromagnetic radiations at 365 nm and 450 nm, respectively. Molecular dynamics simulation studies demonstrated that the channel formed by assembling trans monomers exhibited greater stability when compared to the channel formed by cis monomers. Additionally, the trans channel was found to recognize and transport chloride effectively.
{"title":"Dynamic regulation of ion transport through a bis(1,3-propanediol)-based channel via allosteric azobenzene photoswitching","authors":"Manzoor Ahmad, Susmita Sarkar, Ravindra Bhogade, Abhishek Mondal, Debashis Mondal, Jagannath Mondal, Pinaki Talukdar","doi":"10.1039/d4nr01711k","DOIUrl":"https://doi.org/10.1039/d4nr01711k","url":null,"abstract":"The transportation of ions across cell membranes is vital in biological functions and is frequently controlled by external triggers like light, ligands, and voltage. Synthetic ion transport systems, particularly those featuring gating mechanisms, have attracted considerable interest. In this research, we engineered self-assembled barrel rosette ion channels using a photoresponsive azobenzene integrated at an allosteric site. Morphological studies verified more effective self-assembly of the trans form in contrast to the cis form. The restricted self-assembly of the cis form can be ascribed to the nonplanar structure of cis azobenzene moieties, which inhibits favorable π-π stacking interactions. The ion transport studies demonstrated the formation of ion channels by the trans form with anion antiport as the primary transport mechanism. In contrast, the cis form exhibited lower efficiency. Based on these observations, dynamically gated ion transport was achieved by employing two sets of electromagnetic radiations at 365 nm and 450 nm, respectively. Molecular dynamics simulation studies demonstrated that the channel formed by assembling trans monomers exhibited greater stability when compared to the channel formed by cis monomers. Additionally, the trans channel was found to recognize and transport chloride effectively.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"192 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678920","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
High-strength, strongly bonded and self-healing materials would be of great interest for several applications, however, the experimental and in-silico design of all such properties in a single material is challenging. In the present work, encouraged by cartilage tissue, polyacrylamide (PAM)-based tough and durable dimers (PAM-Ag and PAM-BNOH) and trimer (PAM-Ag-BNOH) nanocomposites were synthesized by encapsulating silver (Ag) and hydroxylated hexagonal boron nitride (BNOH). The strong interfacial interaction was achieved by introducing (computational modelling and DFT approaches) noncovalent bonds involved in the dimer and trimer nanohybrids. The fabricated PAM-Ag-BN nanocomposite showed higher mechanical strength (0.31 MPa compressive strength and 0.29 MPa Young’s modulus) than that of dimer hydrogel composites. The long-term durability of the hydrogel samples was tested by electrochemical testing of hydrogels in simulated body fluid and the higher corrosion resistance (icorr 2.65 × 10-5 A/cm2) was obtained for trimer hydrogel. Moreover, the supramolecular cross-linked assembly of PAM-Ag-BN perfectly showed the bioactivity including bone formation ability, self-healing performance, restricted cytotoxicity, and anti-microbial activity. The synergistic effect of nano and micron-sized particles in PAM-Ag-BN ensued in the strong interfacial interlocking through the formation of hydrogen bonding between Ag, BNOH and PAM. Therefore, the fabricated tough hydrogel composite can be a leading biomaterial for soft tissue (articular cartilage) regeneration. The present research opens new directions in developing smart self-healing nanocomposites vastly used in cartilage tissue engineering.
{"title":"Tough, Durable and Strongly Bonded Self-Healing Cartilage-mimicking Noncovalent Assembly Hydrogel Nanostructures: The Interplay of Experiment and Theory","authors":"Shikha Awasthi, Sarvesh Kumar Pandey, Hulikere Jagdish Shwetha, Nehal Jakhar, Sankar Selvaraj","doi":"10.1039/d4nr03322a","DOIUrl":"https://doi.org/10.1039/d4nr03322a","url":null,"abstract":"High-strength, strongly bonded and self-healing materials would be of great interest for several applications, however, the experimental and in-silico design of all such properties in a single material is challenging. In the present work, encouraged by cartilage tissue, polyacrylamide (PAM)-based tough and durable dimers (PAM-Ag and PAM-BNOH) and trimer (PAM-Ag-BNOH) nanocomposites were synthesized by encapsulating silver (Ag) and hydroxylated hexagonal boron nitride (BNOH). The strong interfacial interaction was achieved by introducing (computational modelling and DFT approaches) noncovalent bonds involved in the dimer and trimer nanohybrids. The fabricated PAM-Ag-BN nanocomposite showed higher mechanical strength (0.31 MPa compressive strength and 0.29 MPa Young’s modulus) than that of dimer hydrogel composites. The long-term durability of the hydrogel samples was tested by electrochemical testing of hydrogels in simulated body fluid and the higher corrosion resistance (icorr 2.65 × 10-5 A/cm2) was obtained for trimer hydrogel. Moreover, the supramolecular cross-linked assembly of PAM-Ag-BN perfectly showed the bioactivity including bone formation ability, self-healing performance, restricted cytotoxicity, and anti-microbial activity. The synergistic effect of nano and micron-sized particles in PAM-Ag-BN ensued in the strong interfacial interlocking through the formation of hydrogen bonding between Ag, BNOH and PAM. Therefore, the fabricated tough hydrogel composite can be a leading biomaterial for soft tissue (articular cartilage) regeneration. The present research opens new directions in developing smart self-healing nanocomposites vastly used in cartilage tissue engineering.","PeriodicalId":92,"journal":{"name":"Nanoscale","volume":"57 1","pages":""},"PeriodicalIF":6.7,"publicationDate":"2024-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142678921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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