Nanomaterials最新文献

{"title":"Constructing Co₃O₄ Nanowire@NiCo₂O₄ Nanosheet Hierarchical Array as Electrode Material for High-Performance Supercapacitor.","authors":"Bo Xu, Lu Pan, Yaqi Wang, Menglong Liu","doi":"10.3390/nano14211703","DOIUrl":"10.3390/nano14211703","url":null,"abstract":"<p><p>The Co₃O₄ nanowire@NiCo₂O₄ nanosheet hierarchical array was constructed on Ni foam using hydrothermal and annealing approaches in turn, from which a NiCo₂O₄ nanosheet could self-assemble on the Co₃O₄ nanowire. The structure and morphology of the Co₃O₄ nanowire@NiCo₂O₄ nanosheet hierarchical array were characterized via XRD, EDS, SEM, and FESEM, respectively. The electrochemical performance of the composite array was measured via a cyclic voltammetry curve, galvanostatic current charge-discharge, charge-discharge cycle, and electrochemical impedance and then compared with the Co₃O₄ nanowire. The results show that the Co₃O₄ nanowire@NiCo₂O₄ nanosheet hierarchical array could reach a high value of 2034 F g^-1 at a current density of 2.5 A g^-1. After 5000 galvanostatic charge-discharge cycles, the specific capacitance of the Co₃O₄ nanowire@NiCo₂O₄ nanosheet hierarchical array could still maintain 94.7% of the original value. Therefore, the Co₃O₄ nanowire@NiCo₂O₄ nanosheet hierarchical array would be a desirable electrode material for a high-performance supercapacitor.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":"14 21","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11547568/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142605097","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":"Electrochemical Growth of Copper Crystals on SPCE for Electrocatalysis Nitrate Reduction.","authors":"Roberta Farina, Giuseppe D'Arrigo, Alessandra Alberti, Giuseppe E Capuano, Domenico Corso, Giuseppe A Screpis, Maria Anna Coniglio, Guglielmo G Condorelli, Sebania Libertino","doi":"10.3390/nano14211704","DOIUrl":"10.3390/nano14211704","url":null,"abstract":"<p><p>Copper is efficient, has a high conductivity (5.8 × 10⁷ S/m), and is cost-effective. The use of copper-based catalysts is promising for the electrocatalytic reduction of nitrates. This work aims to grow and characterize copper micro-crystals on Screen-Printed Electrodes (SPEs) for NO₃^- reduction in water. Copper micro-crystals were grown by cyclic voltammetry. Different cycles (2, 5, 7, 10, 12, 15) of copper electrodeposition were investigated (potential ranges from -1.0 V to 0.0 V, scan rate of 0.1 V s^-1). Electrodeposition generated different morphologies of copper crystals on the electrodes, as a function of the number of cycles, with various performances. The presence of numerous edges and defects in the copper micro-crystal structures creates highly reactive active sites, thus favoring nitrate reduction. The manufactured material can be successfully employed for environmental applications.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":"14 21","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11547369/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142605196","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":"Fabrication of Anthocyanidin-Encapsulated Polyvinyl Alcohol Nanofibrous Membrane for Smart Packaging.","authors":"Maryam Aldoghaim, Jabrah Alkorbi, Salhah D Al-Qahtani, Ghadah M Al-Senani","doi":"10.3390/nano14211701","DOIUrl":"10.3390/nano14211701","url":null,"abstract":"<p><p>Smart colorimetric packaging has been an important method to protect human health from external hazardous agents. However, the currently available colorimetric detectors use synthetic dye probes, which are costly, toxic, difficult to prepare, and non-biodegradable. Herein, an environmentally friendly cellulose nanocrystal (CNC)-supported polyvinyl alcohol (PVA) nanofibrous membrane was developed for the colorimetric monitoring of food spoilage. Anthocyanidin (ACY) is a naturally occurring spectroscopic probe that was isolated from pomegranate (<i>Punica granatum</i> L.). By encapsulating the anthocyanin probe in electrospun polyvinyl alcohol fibers in the presence of a mordant (M), M/ACY nanoparticles were generated. After exposure to rotten shrimp, an investigation on the colorimetric changes from purple to green for the smart nanofibrous fabric was conducted using the coloration parameters and absorbance spectra. In response to increasing the length of exposure to rotten shrimp, the absorption spectra of the anthocyanin-encapsulated nanofibrous membrane showed a wavelength blueshift from 580 nm to 412 nm. CNC displayed a diameter of 12-17 nm. The nanoparticle diameter of M/ACY was monitored in the range of 8-13 nm, and the nanofiber diameter was shown in the range of 70-135 nm. Slight changes in comfort properties were monitored after encapsulating M/ACY in the nanofibrous fabric.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":"14 21","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11547423/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142605300","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":"Hierarchical Heterojunctions of Metal Sulfide WS₂ Nanosheets/Metal Oxide In₂O₃ Nanofibers for an Efficient Detection of Formaldehyde.","authors":"Lei Zhu, Jiaxin Zhang, Jianan Wang, Jianwei Liu, Wei Yan","doi":"10.3390/nano14211702","DOIUrl":"10.3390/nano14211702","url":null,"abstract":"<p><p>The construction of transition metal dichalcogenides (TMDs) heterojunctions for high-performance gas sensors has garnered significant attention due to their capacity to operate at low temperatures. Herein, we realize two-dimensional (2D) WS₂ nanosheets in situ grown on one-dimensional (1D) In₂O₃ nanofibers to form heterostructures for formaldehyde (HCHO) gas sensors. Capitalizing on the p-n heterojunctions formed between WS₂ and In₂O₃, coupled with the high surface-to-volume ratio characteristic of 1D nanostructures, the WS₂/In₂O₃ NFs sensor demonstrated an elevated gas response of 12.6 toward 100 ppm HCHO at 140 °C, surpassing the performance of the pristine In₂O₃ sensor by a factor of two. Meanwhile, the sensor presents remarkable repeatability, rapid response/recovery speed, and good long-term stability. The superior sensing capabilities of WS₂/In₂O₃ NFs heterojunction are attributed to the combined impact of the increased charge transfer and the presence of more sites for gas adsorption. The research endows a potent approach for fabricating TMD heterojunctions to significantly enhance the gas sensing properties of gas sensors at relatively low temperatures.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":"14 21","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11547418/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142605369","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":"Sodium Alginate/MXene-Based Flexible Humidity Sensors with High-Humidity Durability and Application Potentials in Breath Monitoring and Non-Contact Human-Machine Interfaces.","authors":"Huizhen Chen, Xiaodong Huang, Yikai Yang, Yang Li","doi":"10.3390/nano14211694","DOIUrl":"10.3390/nano14211694","url":null,"abstract":"<p><p>Flexible humidity sensors (FHSs) with fast response times and durability to high-humidity environments are highly desirable for practical applications. Herein, an FHS based on crosslinked sodium alginate (SA) and MXene was fabricated, which exhibited high sensitivity (impedance varied from 10⁷ to 10⁵ Ω between 10% and 90% RH), good selectivity, prompt response times (response/recover time of 4 s/11 s), high sensing linearity (R² = 0.992) on a semi-logarithmic scale, relatively small hysteresis (~5% RH), good repeatability, and good resistance to highly humid environments (negligible changes in sensing properties after being placed in 98% RH over 24 h). It is proposed that the formation of the crosslinking structure of SA and the introduction of MXene with good conductivity and a high specific surface area contributed to the high performance of the composite FHS. Moreover, the FHS could promptly differentiate the respiration status, recognize speech, and measure fingertip movement, indicating potential in breath monitoring and non-contact human-machine interactions. This work provides guidance for developing advanced flexible sensors with a wide application scope in wearable electronics.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":"14 21","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11547644/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142605591","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":"Iron and Nitrogen-Doped Wheat Straw Hierarchical Porous Carbon Materials for Supercapacitors.","authors":"Xiaoshuai Sun, Xiangyu Chen, Jiahua Ma, Chuanshan Zhao, Jiehua Li, Hui Li","doi":"10.3390/nano14211692","DOIUrl":"10.3390/nano14211692","url":null,"abstract":"<p><p>In this paper, we prepared a new type of iron and nitrogen co-doped porous carbon material (WSC-Fe/N) using a carbonization-activation process with wheat straw as a precursor and FeCl₃ and NH₄Cl as co-doping agents and analyzed the electrochemical properties of the resulting electrode material. Through precise control of the doping elements and carbonization temperature (900 °C), the resulting WSC-Fe/N-900 material exhibits abundant micropores, uniform mesopores, a significant specific surface area (2576.6 m² g^-¹), an optimal level of iron doping (1.7 wt.%), and excellent graphitization. These characteristics were confirmed through X-ray diffraction and Raman spectroscopy. Additionally, the WSC-Fe/N-900 electrode demonstrated a specific capacitance of 400.5 F g^-¹ at a current density of 0.5 A g^-¹, maintaining a high capacitance of 308 F g^-¹ even at 10 A g^-¹. The solid-state symmetric supercapacitor in an aqueous electrolyte achieved an energy density of 9.2 Wh kg^-¹ at a power density of 250 W kg^-¹ and maintained an energy density of 6.5 Wh kg^-¹ at a power density of 5000 W kg^-¹, demonstrating remarkable synergistic energy-power output characteristics. In terms of structural properties, the porous characteristics of WSC-Fe/N-900 not only enhance the specific surface area of the electrode but also improve the diffusion capability of electrolyte ions within the electrode, thereby enhancing capacitance performance. The reliability of the electrode material demonstrated good performance in long-term cycling tests, maintaining a capacitance retention rate of 93% after 10,000 charge-discharge cycles, indicating excellent electrochemical stability. Furthermore, over time, the aging effect of the WSC-Fe/N-900 electrode material is minimal, maintaining high electrochemical performance even after prolonged use, suggesting that this material is suitable for long-term energy storage applications. This study introduces a novel strategy for producing porous carbon materials for supercapacitors, advancing the development of economically efficient and environmentally friendly energy storage solutions.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":"14 21","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11547934/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142605533","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 Comparative Study of Neutron Shielding Performance in Al-Based Composites Reinforced with Various Boron-Containing Particles for Radiotherapy: A Monte Carlo Simulation.","authors":"Shiyan Yang, Yupeng Yao, Hanlong Wang, Hai Huang","doi":"10.3390/nano14211696","DOIUrl":"10.3390/nano14211696","url":null,"abstract":"<p><p>This study aimed to assess and compare the shielding performance of boron-containing materials for neutrons generated in proton therapy and used in boron neutron capture therapy (BNCT). Five composites, including AlB₂, Al-B₄C, Al-TiB₂, Al-BN, and Al-TiB₂-BN, were selected as shielding materials, with concrete used as a benchmark. The mass fraction of boron compounds in these materials ranged from 10% to 50%. The Monte Carlo toolkit Geant4 was employed to calculate shielding parameters, including neutron ambient dose equivalent, dose values, and macroscopic cross-section. Results indicated that, compared to concrete, these boron-containing materials more effectively absorb thermal neutrons. When the boron compound exceeds 30 wt.%, these materials exhibit better shielding performance than concrete of the same thickness for neutrons generated by protons. For a given material, its shielding capability increases with boron content. Among the five materials when the material thickness and boron compound content are the same, the shielding performance for neutrons generated by protons, from best to worst, is as follows: Al-TiB₂, Al-B₄C, AlB₂, Al-TiB₂-BN, and Al-BN. For BNCT, the shielding performance from best to worst is in the following order: Al-B₄C, AlB₂, Al-TiB₂, Al-TiB₂-BN, and Al-BN. The results of this study provide references and guidelines for the selection and optimization of neutron shielding materials in proton therapy and BNCT facilities.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":"14 21","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11547794/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142605063","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":"Organic-Inorganic Hybridization of Silkworm Cocoon Filaments Using Nano Pastes of Silica-Phosphate-M (M = Cu, Fe, or Al).","authors":"I Wayan Karyasa, Enike Dwi Kusumawati, Retno Agustarini, Lincah Andadari, Herman Sari","doi":"10.3390/nano14211697","DOIUrl":"10.3390/nano14211697","url":null,"abstract":"<p><p>Inorganic-organic hybrid biomaterials have recently attracted much attention because of their widespread use. Silkworm cocoon filaments resulting from sericulture as prospective nanobiomaterials need to be improved, and their properties need to be used for broader purposes. This study was aimed at investigating methods for siliconization of silkworm cocoon filaments and characterizing their cocoon filament properties in terms of their yarn quality, natural dyeing, and antibacterial properties. Three methods of hybridization processes were used in this experiment, namely, in situ natural dyeing of silk yarns while silk filaments were spined, feed engineering through spraying the mulberry leaves with natural dyes and silica-phosphate-M (M = Cu, Fe, or Al) nano pastes, and a combination of both methods. The resulting cocoon filaments were characterized by their siliconization of filament fibers by using FTIR, XRD, and SEM-EDS methods. The yarn tensile strength, color quality, color fastness properties affected by the siliconization of silk filament fibers, and antibacterial properties were also investigated. Results showed that the combination method produced better siliconization of silk fibers, and, consequently, the better siliconization of silk fibers produced better natural dyeing as well as antibacterial properties of their resulting silk yarns.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":"14 21","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11547458/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142605558","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":"Exploiting the Bragg Mirror Effect of TiO₂ Nanotube Photonic Crystals for Promoting Photoelectrochemical Water Splitting.","authors":"Ming Meng, Hucheng Zhou, Jing Yang, Liwei Wang, Honglei Yuan, Yanling Hao, Zhixing Gan","doi":"10.3390/nano14211695","DOIUrl":"10.3390/nano14211695","url":null,"abstract":"<p><p>Exploiting the Bragg mirror effect of photonic crystal photoelectrode is desperately desired for photoelectrochemical water splitting. Herein, a novel TiO₂ nanotube photonic crystal bi-layer structure consisting of a top nanotube layer and a bottom nanotube photonic crystal layer is presented. In this architecture, the photonic bandgap of bottom TiO₂ nanotube photonic crystals can be precisely adjusted by modulating the anodization parameters. When the photonic bandgap of bottom TiO₂ nanotube photonic crystals overlaps with the electronic bandgap of TiO₂, the bottom TiO₂ nanotube photonic crystal layer will act as a Bragg mirror, leading to the boosted ultraviolet light absorption of the top TiO₂ nanotube layer. Benefiting from the promoted UV light absorption, the TiO₂ NT-115-NTPC yields a photocurrent density of 1.4 mA/cm² at 0.22 V vs. Ag/AgCl with a Faradic efficiency of 100%, nearly two times higher than that of conventional TiO₂ nanotube arrays. Furthermore, incident photon-to-current conversion efficiency is also promoted within ultraviolet light region. This research offers an effective strategy for improving the performance of photoelectrochemical water splitting through intensifying the light-matter interaction.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":"14 21","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11547193/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142605291","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":"Accelerated Wound Healing of Tetrahedral-Framework Nucleic Acid Nanozymes with High Penetration and Antioxidant Capacity.","authors":"Shiyu Lin, Qian Liu, Yu Xie, Qi Zhang","doi":"10.3390/nano14211693","DOIUrl":"10.3390/nano14211693","url":null,"abstract":"<p><p>The wound repair process usually leads to a non-functioning mass of fibrotic tissue because of the oxidative imbalance of deep tissue layers. However, how to improve the penetration of active ingredients into deeper layers and regulate oxidative imbalances to create a regenerative microenvironment still remains a challenge. In this study, we designed a novel tetrahedral-framework nucleic acid (tFNA) nanozyme that could penetrate the skin/mucosa barrier as deep as 450 μm within 24 h. We also demonstrated the protective role of tFNAs on the mitochondrial structural and functional integrity and inhibition of reactive oxygen species production to repair oxidative imbalances through ERK1/2-Nrf2-HO-1 during repair processes. It was found that the proliferative state and the migration ability of postburn cells in vitro were accelerated, and the early closure of wounds in vivo was significantly promoted. This study therefore provides a promising strategy to efficiently regulate the oxidative imbalances in the deep layers of the skin during wound healing.</p>","PeriodicalId":18966,"journal":{"name":"Nanomaterials","volume":"14 21","pages":""},"PeriodicalIF":4.4,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11547624/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142605069","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}