The poor impedance matching characteristics of FeCo alloy nanoparticles severely restrict its development with higher efficiency, wider bandwidth, and stronger absorption materials. The main strategy for addressing this issue is to design core–shell structures to adjust the electromagnetic parameters and impedance matching. Currently, the research of core–shell structures primarily focuses on composites of magnetic/single wave-transparent/dielectric materials, with limited research on synergistic modifications of multiple wave-transparent components in magnetic nanomaterials for enhanced electromagnetic wave absorption. Here, a trilayer core–shell structure FeCo@SiO2@lithium–aluminum–silicate glass-ceramic (LAS) nanoabsorber was successfully fabricated via the sol–gel method in a kinetically controlled manner, which exhibited fascinating electromagnetic wave absorption performance with a minimum reflection loss of −50.90 dB and a maximum effective absorption bandwidth of 7.52 GHz. The results confirm that the modulating effects of the FeCo core on electromagnetic wave absorption performance for SiO2 at low frequency and LAS at high frequency can be coupled and superimposed. This study demonstrates the potential of magnetic nanomaterials modified by incorporating multiple wave-transparent components, while providing insights for the development of lightweight and wide effective bandwidth nanoabsorbers.
铁钴合金纳米颗粒的阻抗匹配特性较差，严重制约了其向更高效率、更宽带宽和更强吸收材料方向发展。解决这一问题的主要策略是设计核壳结构来调整电磁参数和阻抗匹配。目前，对核壳结构的研究主要集中在磁性/单一透波/介电材料的复合材料上，而对磁性纳米材料中多种透波成分协同改性以增强电磁波吸收的研究还很有限。本文通过溶胶-凝胶法成功制备了三层核壳结构的FeCo@SiO2@锂铝硅酸盐玻璃陶瓷（LAS）纳米吸收体，该吸收体具有迷人的电磁波吸收性能，最小反射损耗为-50.90 dB，最大有效吸收带宽为7.52 GHz。结果证实，FeCo 内核对 SiO2 低频电磁波吸收性能和 LAS 高频电磁波吸收性能的调制效应可以耦合叠加。这项研究证明了加入多种透波成分的磁性纳米材料的潜力，同时也为开发轻质、宽有效带宽纳米吸收器提供了启示。
{"title":"Trilayer Core–Shell FeCo@SiO2@Lithium–Aluminum–Silicate Microspheres for Electromagnetic Wave Absorption","authors":"Shaocong Zhong, Jingyu Wang, Xueting Zhang, Ying Liu, Xinyu Wang, Xiuzhu Han, Pianpian Zhang, Long Xia","doi":"10.1021/acsanm.4c02686","DOIUrl":"https://doi.org/10.1021/acsanm.4c02686","url":null,"abstract":"The poor impedance matching characteristics of FeCo alloy nanoparticles severely restrict its development with higher efficiency, wider bandwidth, and stronger absorption materials. The main strategy for addressing this issue is to design core–shell structures to adjust the electromagnetic parameters and impedance matching. Currently, the research of core–shell structures primarily focuses on composites of magnetic/single wave-transparent/dielectric materials, with limited research on synergistic modifications of multiple wave-transparent components in magnetic nanomaterials for enhanced electromagnetic wave absorption. Here, a trilayer core–shell structure FeCo@SiO<sub>2</sub>@lithium–aluminum–silicate glass-ceramic (LAS) nanoabsorber was successfully fabricated via the sol–gel method in a kinetically controlled manner, which exhibited fascinating electromagnetic wave absorption performance with a minimum reflection loss of −50.90 dB and a maximum effective absorption bandwidth of 7.52 GHz. The results confirm that the modulating effects of the FeCo core on electromagnetic wave absorption performance for SiO<sub>2</sub> at low frequency and LAS at high frequency can be coupled and superimposed. This study demonstrates the potential of magnetic nanomaterials modified by incorporating multiple wave-transparent components, while providing insights for the development of lightweight and wide effective bandwidth nanoabsorbers.","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":null,"pages":null},"PeriodicalIF":5.9,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141525329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xiangyi Kong, Hongyu Chen, Hejian Li, Liancong Yue, Min Gong, Xiang Lin, Meiqin Zhang, Liang Zhang, Dongrui Wang
Flexible transparent electrodes (FTEs) constructed from silver nanowires (AgNWs) have potential applications in a wide range of flexible optoelectronic devices. However, the uncontrollable alignment of AgNWs makes it challenging to manufacture high-performance and cost-effective AgNW-based FTEs. Herein, we present a direct-ink-writing technique for patterning AgNWs into high-resolution (line width as small as 33 μm), ultrathin (line height as small as 57 nm), and large-area (as large as 220 × 160 mm2) orthogonal grids in a single writing pass. The hierarchically ordered (HO) AgNW grids exhibit superior properties with a sheet resistance of 25.3 Ω/sq, a visible-light transmittance (T) of 98.6%, a high figure of merit of 1053, and a haze factor of 0.46% at an extremely low AgNW dosage of 2.1 μg/cm2. The wearable transparent heaters utilizing the printed HO AgNW grids exhibit excellent Joule heating performance. This work showcases a strategy for fabricating cost-effective AgNW-based FTEs that can be used to replace indium–tin oxide in large-scale applications.
{"title":"Hierarchically Ordered Grid-Type Silver Nanowire Microelectrodes via Direct Ink Writing","authors":"Xiangyi Kong, Hongyu Chen, Hejian Li, Liancong Yue, Min Gong, Xiang Lin, Meiqin Zhang, Liang Zhang, Dongrui Wang","doi":"10.1021/acsanm.4c02614","DOIUrl":"https://doi.org/10.1021/acsanm.4c02614","url":null,"abstract":"Flexible transparent electrodes (FTEs) constructed from silver nanowires (AgNWs) have potential applications in a wide range of flexible optoelectronic devices. However, the uncontrollable alignment of AgNWs makes it challenging to manufacture high-performance and cost-effective AgNW-based FTEs. Herein, we present a direct-ink-writing technique for patterning AgNWs into high-resolution (line width as small as 33 μm), ultrathin (line height as small as 57 nm), and large-area (as large as 220 × 160 mm<sup>2</sup>) orthogonal grids in a single writing pass. The hierarchically ordered (HO) AgNW grids exhibit superior properties with a sheet resistance of 25.3 Ω/sq, a visible-light transmittance (<i>T</i>) of 98.6%, a high figure of merit of 1053, and a haze factor of 0.46% at an extremely low AgNW dosage of 2.1 μg/cm<sup>2</sup>. The wearable transparent heaters utilizing the printed HO AgNW grids exhibit excellent Joule heating performance. This work showcases a strategy for fabricating cost-effective AgNW-based FTEs that can be used to replace indium–tin oxide in large-scale applications.","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":null,"pages":null},"PeriodicalIF":5.9,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141525334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The present study reported the synthesis of three CuX/S-doped g-C3N4 nanocomposites (CuX= CuO/CuS/Cu2O) via an efficient and simple approach. The various prepared nanocomposites were characterized with different characterization techniques and demonstrated the synthesis of pure nanocomposites. Among three CuX/S-doped g-C3N4 nanocomposites, CuS/S-doped g-C3N4 exhibits a remarkable electrochemical performance for detecting dopamine (DA). Herein, various electrochemical parameters, such as the volume of the electrocatalyst used and the solution’s pH, were optimized to achieve efficient detection. Under favorable conditions, CuS/S-doped g-C3N4 demonstrated an effective electrochemical response for DA detection using linear sweep voltammetry (LSV) and cyclic voltammetry (CV) methods. The proposed sensor afforded a linear plot between the anodic peak current and concentration of DA in the range of 0–200 μM with the low limit of detection (0.1227 μM or 122.7 nM) between the concentration of DA and anodic peak current. In addition, the constructed sensor for DA detection displayed satisfactory stability and reproducibility. The real sample, i.e., human serum, was employed to assess the ability to perform real-time analysis of the sensing platform. The developed sensor displayed a favorable recovery rate, illustrating its practical functionality.
{"title":"CuX/Sulfur-Doped C3N4 Nanocomposite-Modified Glassy Carbon Electrode for Electrochemical Detection of Dopamine","authors":"Shikha Batish, Jaspreet Kaur Rajput","doi":"10.1021/acsanm.4c01858","DOIUrl":"https://doi.org/10.1021/acsanm.4c01858","url":null,"abstract":"The present study reported the synthesis of three CuX/S-doped g-C<sub>3</sub>N<sub>4</sub> nanocomposites (CuX= CuO/CuS/Cu<sub>2</sub>O) via an efficient and simple approach. The various prepared nanocomposites were characterized with different characterization techniques and demonstrated the synthesis of pure nanocomposites. Among three CuX/S-doped g-C<sub>3</sub>N<sub>4</sub> nanocomposites, CuS/S-doped g-C<sub>3</sub>N<sub>4</sub> exhibits a remarkable electrochemical performance for detecting dopamine (DA). Herein, various electrochemical parameters, such as the volume of the electrocatalyst used and the solution’s pH, were optimized to achieve efficient detection. Under favorable conditions, CuS/S-doped g-C<sub>3</sub>N<sub>4</sub> demonstrated an effective electrochemical response for DA detection using linear sweep voltammetry (LSV) and cyclic voltammetry (CV) methods. The proposed sensor afforded a linear plot between the anodic peak current and concentration of DA in the range of 0–200 μM with the low limit of detection (0.1227 μM or 122.7 nM) between the concentration of DA and anodic peak current. In addition, the constructed sensor for DA detection displayed satisfactory stability and reproducibility. The real sample, i.e., human serum, was employed to assess the ability to perform real-time analysis of the sensing platform. The developed sensor displayed a favorable recovery rate, illustrating its practical functionality.","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":null,"pages":null},"PeriodicalIF":5.9,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141525247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this work, a dual-thiol-responsive drug delivery system was fabricated by embedding the reduction-sensitive doxorubicin prodrug (DOX-prodrug) in the reduction-responsive carrier. Therefore, the amphiphilic block copolymer poly(lactide)-SS-poly(2-hydroxyethyl methacrylate) (PLA-SS-PHEMA) was synthesized to be used as an anticancer drug carrier, which would self-assemble into spherical micelles in an aqueous solution with an average diameter of approximately 100 nm. The DOX-prodrug could be loaded into the PLA-SS-PHEMA micelles with a high drug loading efficiency (5.27%) and entrapment efficiency (58%). The in vitro release results demonstrated that the cleavage of the intervening disulfide bonds in both the carrier and prodrug in response to a reductive environment led to fast release of the anticancer drug. The cytotoxicity results showed that the dual reduction-sensitive drug delivery system could effectively inhibit tumor cell proliferation, while it had almost no side effects on normal cells. The CLSM results are in agreement with that of flow cytometry, indicating that the drug-loaded micelles could be efficiently internalized into the HeLa cells and the drug is released into the cytoplasm and then enters the nuclei. We further investigated the cell endocytosis mechanism for the micelles, suggesting that the clathrin-mediated endocytosis pathway played the main role in the internalization of this nanocarrier.
{"title":"Dual Reduction-Sensitive Nanomicelles for Antitumor Drug Delivery with Low Toxicity to Normal Cells","authors":"Shixi Li, Xue Liu, Xuhua Liang, Xuejun Wang","doi":"10.1021/acsanm.4c01908","DOIUrl":"https://doi.org/10.1021/acsanm.4c01908","url":null,"abstract":"In this work, a dual-thiol-responsive drug delivery system was fabricated by embedding the reduction-sensitive doxorubicin prodrug (DOX-prodrug) in the reduction-responsive carrier. Therefore, the amphiphilic block copolymer poly(lactide)-SS-poly(2-hydroxyethyl methacrylate) (PLA-SS-PHEMA) was synthesized to be used as an anticancer drug carrier, which would self-assemble into spherical micelles in an aqueous solution with an average diameter of approximately 100 nm. The DOX-prodrug could be loaded into the PLA-SS-PHEMA micelles with a high drug loading efficiency (5.27%) and entrapment efficiency (58%). The in vitro release results demonstrated that the cleavage of the intervening disulfide bonds in both the carrier and prodrug in response to a reductive environment led to fast release of the anticancer drug. The cytotoxicity results showed that the dual reduction-sensitive drug delivery system could effectively inhibit tumor cell proliferation, while it had almost no side effects on normal cells. The CLSM results are in agreement with that of flow cytometry, indicating that the drug-loaded micelles could be efficiently internalized into the HeLa cells and the drug is released into the cytoplasm and then enters the nuclei. We further investigated the cell endocytosis mechanism for the micelles, suggesting that the clathrin-mediated endocytosis pathway played the main role in the internalization of this nanocarrier.","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":null,"pages":null},"PeriodicalIF":5.9,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141525260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The development and utilization of flexible piezoresistive sensors based on bionic nanomaterials have garnered considerable attention due to their broad potential in various domains. However, the key to their enhanced performance lies in incorporating microstructures and conductive coatings, which maximize initial resistance and minimize resistance upon pressure application, thereby amplifying the change in resistance signal. In this study, we draw inspiration from the microconvex structure observed on the skin of crocodiles and propose a bionic-structured flexible pressure sensor. The sensor is fabricated using nanocomposites comprising multiwalled carbon nanotubes, silicone rubber, and carbon nanofiber in conjunction with a three-dimensional (3D)-printed bionic structural mold. Sensor structure is similar to a sandwich structure with three layers: a flexible substrate layer, a sensing layer, and an interdigital electrode layer. Our sensor exhibits improved pressure-sensing capabilities, characterized by rapid response and recovery times (25 ms), a wide pressure detection range (0–80 kPa), minimal hysteresis (2.44%), high sensitivity (0.4311 kPa–1 within the 0–10 kPa range), and fine stability (withstanding 6000 cycles under varying pressures). Notably, this sensor has an efficient sensing ability, long-term stability, and good waterproofing properties, expanding its potential applications in human–computer interaction, motion monitoring, intelligent robotics, and underwater rescue operations.
{"title":"Bioinspired Low Hysteresis Flexible Pressure Sensor Using Nanocomposites of Multiwalled Carbon Nanotubes, Silicone Rubber, and Carbon Nanofiber for Human–Computer Interaction","authors":"Xiaohui Guo, Tiancheng Liu, Yongming Tang, Wei Li, Long Liu, Di Wang, Yifan Zhang, Tianxu Zhang, Xiaowen Zhu, Yuxin Guan, Xianghui Li, Yinuo Chen, Xinyu Wu, Guangyu Xiao, Xinchen Wang, Renkai Zhang, Dandan Wang, Zhihong Mai, Weiqiang Hong, Qi Hong, Yunong Zhao, Yongjun Zhang, Ming Wang, Feng Yan, Guozhong Xing","doi":"10.1021/acsanm.4c02631","DOIUrl":"https://doi.org/10.1021/acsanm.4c02631","url":null,"abstract":"The development and utilization of flexible piezoresistive sensors based on bionic nanomaterials have garnered considerable attention due to their broad potential in various domains. However, the key to their enhanced performance lies in incorporating microstructures and conductive coatings, which maximize initial resistance and minimize resistance upon pressure application, thereby amplifying the change in resistance signal. In this study, we draw inspiration from the microconvex structure observed on the skin of crocodiles and propose a bionic-structured flexible pressure sensor. The sensor is fabricated using nanocomposites comprising multiwalled carbon nanotubes, silicone rubber, and carbon nanofiber in conjunction with a three-dimensional (3D)-printed bionic structural mold. Sensor structure is similar to a sandwich structure with three layers: a flexible substrate layer, a sensing layer, and an interdigital electrode layer. Our sensor exhibits improved pressure-sensing capabilities, characterized by rapid response and recovery times (25 ms), a wide pressure detection range (0–80 kPa), minimal hysteresis (2.44%), high sensitivity (0.4311 kPa<sup>–1</sup> within the 0–10 kPa range), and fine stability (withstanding 6000 cycles under varying pressures). Notably, this sensor has an efficient sensing ability, long-term stability, and good waterproofing properties, expanding its potential applications in human–computer interaction, motion monitoring, intelligent robotics, and underwater rescue operations.","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":null,"pages":null},"PeriodicalIF":5.9,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141525335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Meng Guo, Jia Du, Xueguo Liu, Yinghan Cao, Xuyang Li, Keliang Wu, Zhenbo Li
Supercapacitors (SCs) have gained widespread recognition because of their advantageous power density as energy storage devices; it is still a great challenge to design a high-efficiency electrode material with outstanding energy density. In this work, nanorod-like cobalt-doped vanadium sulfide on a graphene nanosheet (Co-VS4/G) is successfully developed with a distinct nanostructure by employing a scalable solvothermal process. The morphology and structure of Co-VS4/G were explored to prove the Co doping well into the crystalline of VS4 architecture. This creates more defects and brings about rich redox reactions, resulting in enhanced electrochemical performance. Noticeably, the fabricated Co-VS4/G composite exhibits a specific capacitance of 1230 F g–1 at 1 A g–1 with a rate capability of 796 F g–1 at a current density value of 30 A g–1 and cycling performance with 88.9% retention of its initial capacitance after 10,000 cycles. Furthermore, the as-fabricated Co-VS4/G//rGO asymmetric supercapacitor (ASC) device presents an energy density value of 75.8 W h kg–1 at a power density of 0.791 kW kg–1 and cycling stability with 91.1% of its capacitance following 10,000 cycles. The performance of the rodlike Co-VS4/G composite shows a predominant advantage toward the development of effective energy storage systems.
超级电容器（SC）因其作为储能设备所具有的功率密度优势而得到广泛认可；但如何设计出一种具有出色能量密度的高效电极材料仍是一项巨大挑战。本研究采用可扩展的溶热工艺，在石墨烯纳米片上成功制备了具有独特纳米结构的纳米棒状掺钴硫化钒（Co-VS4/G）。对 Co-VS4/G 的形貌和结构进行了研究，证明钴掺杂到了 VS4 结构的晶体中。这将产生更多的缺陷并带来丰富的氧化还原反应，从而提高电化学性能。值得注意的是，制备的 Co-VS4/G 复合材料在 1 A g-1 电流密度值下的比电容为 1230 F g-1，在 30 A g-1 电流密度值下的速率能力为 796 F g-1，循环性能在 10,000 次循环后保持了初始电容的 88.9%。此外，经加工的 Co-VS4/G//rGO 非对称超级电容器 (ASC) 器件在功率密度为 0.791 kW kg-1 时的能量密度值为 75.8 W h kg-1，循环稳定性为 10,000 次循环后电容的 91.1%。棒状 Co-VS4/G 复合材料的性能显示出其在开发高效储能系统方面的显著优势。
{"title":"Cobalt-Doped Vanadium Sulfide Nanorods Anchored on Graphene for High-Performance Supercapacitors","authors":"Meng Guo, Jia Du, Xueguo Liu, Yinghan Cao, Xuyang Li, Keliang Wu, Zhenbo Li","doi":"10.1021/acsanm.4c02250","DOIUrl":"https://doi.org/10.1021/acsanm.4c02250","url":null,"abstract":"Supercapacitors (SCs) have gained widespread recognition because of their advantageous power density as energy storage devices; it is still a great challenge to design a high-efficiency electrode material with outstanding energy density. In this work, nanorod-like cobalt-doped vanadium sulfide on a graphene nanosheet (Co-VS<sub>4</sub>/G) is successfully developed with a distinct nanostructure by employing a scalable solvothermal process. The morphology and structure of Co-VS<sub>4</sub>/G were explored to prove the Co doping well into the crystalline of VS<sub>4</sub> architecture. This creates more defects and brings about rich redox reactions, resulting in enhanced electrochemical performance. Noticeably, the fabricated Co-VS<sub>4</sub>/G composite exhibits a specific capacitance of 1230 F g<sup>–1</sup> at 1 A g<sup>–1</sup> with a rate capability of 796 F g<sup>–1</sup> at a current density value of 30 A g<sup>–1</sup> and cycling performance with 88.9% retention of its initial capacitance after 10,000 cycles. Furthermore, the as-fabricated Co-VS<sub>4</sub>/G//rGO asymmetric supercapacitor (ASC) device presents an energy density value of 75.8 W h kg<sup>–1</sup> at a power density of 0.791 kW kg<sup>–1</sup> and cycling stability with 91.1% of its capacitance following 10,000 cycles. The performance of the rodlike Co-VS<sub>4</sub>/G composite shows a predominant advantage toward the development of effective energy storage systems.","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":null,"pages":null},"PeriodicalIF":5.9,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141525251","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Wenjin Zhou, Juanzi Shi, Ruiyun Chen, Guofeng Zhang, Chengbing Qin, Jianyong Hu, Ivan G. Scheblykin, Liantuan Xiao
Manipulating the light polarization properties of gold nanoparticle aggregates can facilitate their applications in sensing and imaging. However, control of the intrinsic light polarization on demand at the nanoscale is hindered by the lack of a fundamental understanding of the structure-dependent plasmon coupling in the aggregates. Here, the polarization properties of intrinsic photoluminescence (PL) and scattering of gold nanoparticle dimers and trimers are studied experimentally and computationally at the single-aggregate level. We find that the PL excitation and emission polarization degrees of the aggregates are highly correlated to the shift of their PL and scattering spectra. The results suggest that the degree of PL polarization is dominated by the strength of the longitudinal plasmon resonance mode arising from the plasmon coupling between the two closest particles in the aggregate. While the PL direction is always along the two most strongly interacting particles in the trimers, changing the arrangement can modify the PL polarization degree. This work provides further insights into the mechanism of the plasmon coupling-induced polarized optical response of aggregated metal nanoparticles and suggests routes to achieve on-demand control of the PL light polarization. This paves the way to using the polarized optical response of plasmonic nanostructures for applications in photonics including sensing and imaging.
{"title":"Aggregation of Gold Nanoparticles for Controlling Emission Polarization: Implications for Applications in Photonics","authors":"Wenjin Zhou, Juanzi Shi, Ruiyun Chen, Guofeng Zhang, Chengbing Qin, Jianyong Hu, Ivan G. Scheblykin, Liantuan Xiao","doi":"10.1021/acsanm.4c01558","DOIUrl":"https://doi.org/10.1021/acsanm.4c01558","url":null,"abstract":"Manipulating the light polarization properties of gold nanoparticle aggregates can facilitate their applications in sensing and imaging. However, control of the intrinsic light polarization on demand at the nanoscale is hindered by the lack of a fundamental understanding of the structure-dependent plasmon coupling in the aggregates. Here, the polarization properties of intrinsic photoluminescence (PL) and scattering of gold nanoparticle dimers and trimers are studied experimentally and computationally at the single-aggregate level. We find that the PL excitation and emission polarization degrees of the aggregates are highly correlated to the shift of their PL and scattering spectra. The results suggest that the degree of PL polarization is dominated by the strength of the longitudinal plasmon resonance mode arising from the plasmon coupling between the two closest particles in the aggregate. While the PL direction is always along the two most strongly interacting particles in the trimers, changing the arrangement can modify the PL polarization degree. This work provides further insights into the mechanism of the plasmon coupling-induced polarized optical response of aggregated metal nanoparticles and suggests routes to achieve on-demand control of the PL light polarization. This paves the way to using the polarized optical response of plasmonic nanostructures for applications in photonics including sensing and imaging.","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":null,"pages":null},"PeriodicalIF":5.9,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141525250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The research and design of oxygen electrode catalysts are of great significance for achieving carbon peak and carbon neutrality goals. In this study, a comprehensive study, including detailed stability, adsorption properties, electronic characteristics, and activity center configuration of ytterbium single-atom catalysts (YbNx-gra) loaded on two-dimensional nanomaterials under acidic conditions, was conducted according to density functional theory calculations. The results indicated that with the increase of nitrogen content, the efficiency of the ytterbium single-atom oxygen electrode catalysts using nitrogen solid supports was improved. There are several good linear relationships between the adsorption free energy of intermediates, such as ΔGOH* and ΔGOOH*, ΔGOH*, and ΔGO*. This provides a basis for the drawing of volcano maps and the rapid prediction of highly active catalysts. Due to the reaction selectivity of catalysts, the O* intermediates and 2OH* intermediates accompany the catalytic reaction. For catalytic activity, the YbN4-II catalyst showed the lowest overpotential of ORR which ηORR = 0.42 V. In particular, the ηORR and ηOER of the YbN3-IV catalyst were as low as 0.58 and 0.41 V, respectively. The linear relationships and volcano plots indicate the feasibility of some YbNx-gra catalysts, making them promising candidates for oxygen electrode catalysts.
{"title":"Density Functional Theory Calculations to Increase the Efficiency of Oxygen Electrode Catalysts from Ytterbium Single Atom Catalysts Using Nitrogen Solid Supports","authors":"Tao Xu, Meiling Liu, Kang Wu, Chao Liu","doi":"10.1021/acsanm.4c02434","DOIUrl":"https://doi.org/10.1021/acsanm.4c02434","url":null,"abstract":"The research and design of oxygen electrode catalysts are of great significance for achieving carbon peak and carbon neutrality goals. In this study, a comprehensive study, including detailed stability, adsorption properties, electronic characteristics, and activity center configuration of ytterbium single-atom catalysts (YbN<sub><i>x</i></sub>-gra) loaded on two-dimensional nanomaterials under acidic conditions, was conducted according to density functional theory calculations. The results indicated that with the increase of nitrogen content, the efficiency of the ytterbium single-atom oxygen electrode catalysts using nitrogen solid supports was improved. There are several good linear relationships between the adsorption free energy of intermediates, such as Δ<i>G</i><sub>OH</sub>* and Δ<i>G</i><sub>OOH</sub>*, Δ<i>G</i><sub>OH</sub>*, and Δ<i>G</i><sub>O</sub>*. This provides a basis for the drawing of volcano maps and the rapid prediction of highly active catalysts. Due to the reaction selectivity of catalysts, the O* intermediates and 2OH* intermediates accompany the catalytic reaction. For catalytic activity, the YbN<sub>4</sub>-II catalyst showed the lowest overpotential of ORR which η<sup>ORR</sup> = 0.42 V. In particular, the η<sup>ORR</sup> and η<sup>OER</sup> of the YbN<sub>3</sub>-IV catalyst were as low as 0.58 and 0.41 V, respectively. The linear relationships and volcano plots indicate the feasibility of some YbN<sub><i>x</i></sub>-gra catalysts, making them promising candidates for oxygen electrode catalysts.","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":null,"pages":null},"PeriodicalIF":5.9,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141525333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Anagha M. Ramesh, Meenakshi Rajesh, Achu Chandran, Kuzhichalil Peethambharan Surendran
In the realm of the Internet of Things, humidity monitoring is imperative for the progressive evolution of intelligent technology within the domains of healthcare, agriculture, and industry. Herein, a resistive-type, multifunctional, and highly sensitive gold-nanoparticle-based humidity sensor was developed, which has a whopping ∼5 orders of resistance change in response to humidity variation from 40%RH to 95%RH. The sensor exhibits excellent sensitivity (28.6 MΩ/%RH), high thermal stability (in the usual working temperature range 25–50 °C), high flexibility (under different bending radii from 18 to 24 mm), prolonged shelf life (∼190 days), and short response/recovery time (∼206/∼280 ms toward respiration monitoring). Owing to these merits, the fabricated sensor has been illustrated for applications like respiration monitoring, non-contact sensing, and soil moisture monitoring. Furthermore, we have designed and demonstrated a smart irrigation system by integrating the gold-nanoparticle-based non-contact humidity sensor for the first time with an Arduino microcontroller. This device is designed to continually observe the soil moisture level using a calibration algorithm that monitors the humidity and supplies water to the crop plant according to a preset threshold. This helps in intelligent assessment and response to the moisture content of the soil in real time.
{"title":"Gold-Nanoparticle-Based Flexible Humidity Sensor for Breath Monitoring and Smart Irrigation Systems","authors":"Anagha M. Ramesh, Meenakshi Rajesh, Achu Chandran, Kuzhichalil Peethambharan Surendran","doi":"10.1021/acsanm.4c02603","DOIUrl":"https://doi.org/10.1021/acsanm.4c02603","url":null,"abstract":"In the realm of the Internet of Things, humidity monitoring is imperative for the progressive evolution of intelligent technology within the domains of healthcare, agriculture, and industry. Herein, a resistive-type, multifunctional, and highly sensitive gold-nanoparticle-based humidity sensor was developed, which has a whopping ∼5 orders of resistance change in response to humidity variation from 40%RH to 95%RH. The sensor exhibits excellent sensitivity (28.6 MΩ/%RH), high thermal stability (in the usual working temperature range 25–50 °C), high flexibility (under different bending radii from 18 to 24 mm), prolonged shelf life (∼190 days), and short response/recovery time (∼206/∼280 ms toward respiration monitoring). Owing to these merits, the fabricated sensor has been illustrated for applications like respiration monitoring, non-contact sensing, and soil moisture monitoring. Furthermore, we have designed and demonstrated a smart irrigation system by integrating the gold-nanoparticle-based non-contact humidity sensor for the first time with an Arduino microcontroller. This device is designed to continually observe the soil moisture level using a calibration algorithm that monitors the humidity and supplies water to the crop plant according to a preset threshold. This helps in intelligent assessment and response to the moisture content of the soil in real time.","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":null,"pages":null},"PeriodicalIF":5.9,"publicationDate":"2024-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141525252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N. Buatip, T. Auzelle, P. John, S. Rauwerdink, M. Sodhi, M. Salaün, B. Fernandez, E. Monroy, D. Mornex, C. R. Bowen, R. Songmuang
In this study, a detailed analysis of the direct piezo-response of AlN nanowire-based vertically integrated nanogenerators (VINGs) is undertaken as a function of mechanical excitation frequency. We show that the piezo-charge, piezo-voltage, and impedance measured at the same position of the devices can be directly correlated through an equivalent circuit model in the whole frequency range of investigation. Our presented results are utilized to determine the performance figures of merit (FoM) of nanowire-based VINGs, namely, the piezoelectric voltage constant (g) for sensing and the product d · g for energy harvesting, where d is the piezoelectric charge constant. By comparison of these metrics with those of freestanding single-crystal GaN and quartz substrates as well as sputtered AlN thin films, we suggest that the nanowires can outperform their rigid counterparts in terms of mechanical sensing and energy generation. This work provides experimental guidelines for understanding the direct piezo-characteristics of VINGs and facilitates a quantitative comparison between nanostructured piezoelectric devices fabricated by using different materials or architectures.
{"title":"AlN Nanowire-Based Vertically Integrated Piezoelectric Nanogenerators","authors":"N. Buatip, T. Auzelle, P. John, S. Rauwerdink, M. Sodhi, M. Salaün, B. Fernandez, E. Monroy, D. Mornex, C. R. Bowen, R. Songmuang","doi":"10.1021/acsanm.4c03075","DOIUrl":"https://doi.org/10.1021/acsanm.4c03075","url":null,"abstract":"In this study, a detailed analysis of the direct piezo-response of AlN nanowire-based vertically integrated nanogenerators (VINGs) is undertaken as a function of mechanical excitation frequency. We show that the piezo-charge, piezo-voltage, and impedance measured at the same position of the devices can be directly correlated through an equivalent circuit model in the whole frequency range of investigation. Our presented results are utilized to determine the performance figures of merit (FoM) of nanowire-based VINGs, namely, the piezoelectric voltage constant (<i>g</i>) for sensing and the product <i>d</i> · <i>g</i> for energy harvesting, where <i>d</i> is the piezoelectric charge constant. By comparison of these metrics with those of freestanding single-crystal GaN and quartz substrates as well as sputtered AlN thin films, we suggest that the nanowires can outperform their rigid counterparts in terms of mechanical sensing and energy generation. This work provides experimental guidelines for understanding the direct piezo-characteristics of VINGs and facilitates a quantitative comparison between nanostructured piezoelectric devices fabricated by using different materials or architectures.","PeriodicalId":6,"journal":{"name":"ACS Applied Nano Materials","volume":null,"pages":null},"PeriodicalIF":5.9,"publicationDate":"2024-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141525341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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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