Next Nanotechnology最新文献_第2页

Enhancing magnetic hyperthermia: Investigating iron oxide nanoparticle coating and stability

Next Nanotechnology

Pub Date : 2025-01-01 DOI: 10.1016/j.nxnano.2025.100141

Joana Santos , Jorge Carvalho Silva , Manuel A. Valente , Tânia Vieira , Paula I.P. Soares

Cancer treatment research focuses on overcoming the limitations of conventional treatment methods, especially in addressing treatment-resistant malignancies. Magnetic hyperthermia (MH) is an innovative approach that uses superparamagnetic iron oxide nanoparticles (SPIONs) to increase the temperature locally, triggering cancer cell death. However, challenges related to the SPIONs coating impact their stability and MH heating mechanism, hindering its clinical adoption. This work explores diverse SPIONs coating options - oleic acid (OA), dimercaptosuccinic acid (DMSA), and (3-aminopropyl)triethoxysilane (APTES), to improve SPIONS stability under storage while keeping their heating capacity. OA- and DMSA-coated SPIONs, both negatively charged NPs, exhibited similar behavior in protein corona formation and MH tests. The heating capacity of the three types of SPIONs was maintained after 1 month of storage; however, these values significantly decreased to about 60 % of the initial value after 6 months. APTES-coated SPIONs displayed higher protein corona formation, mainly related to the positively charged surface. Interaction studies with three cell lines (fibroblasts, melanoma, and macrophages) revealed enhanced internalization of APTES-coated SPIONs. Only APTES-coated SPIONs achieved therapeutic temperatures in MH assays, reducing melanoma cell viability significantly. The study underscores the importance of nanoparticle surface modifications and the complexity of factors influencing treatment efficacy. Further research is essential for a better understanding of the cell death mechanism induced by MH and for its clinical translation.

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引用次数: 0

Nanoparticles assisted drug delivery for effective management of Glioblastoma

Next Nanotechnology

Pub Date : 2025-01-01 DOI: 10.1016/j.nxnano.2025.100137

Mansi Damani , Nagesh Nilawar , Munira Momin , Raghumani Singh Ningthoujham , Tabassum Khan

Glioblastoma multiforme (GBM) is one of the most aggressive forms of primary brain tumor with a dire prognosis due to its heterogeneity, invasive nature, and resistance to conventional therapies. Standard treatments, including surgery, radiotherapy, and chemotherapy with temozolomide (TMZ), are often limited by the ability of the tumor to circumvent therapeutic effects and by the physiological barriers that restrict drug delivery to the brain parenchyma. Specifically, the blood-brain barrier (BBB) and the blood-brain tumor barrier (BBTB) impede the effective concentration of therapeutic agents within the brain, posing a significant challenge in treating GBM. The primary focus of current research has pivoted towards nanotechnology to address these limitations. Due to their size, surface modifications, and capability to encapsulate drugs, nanocarriers like polymeric, metallic, and lipid nanoparticles have shown potential in enhancing the penetration of anticancer agents across the BBB and BBTB, thus increasing treatment efficacy and minimizing general toxicity. Moreover, lipid-based nanoparticles, such as solid lipid nanoparticles (SLNs) and nanostructured lipid carriers (NLCs), offer advantages in drug encapsulation, stability, and controlled release metal nanoparticles, including gold and silver nanoparticles, provide unique properties for imaging and photothermal therapy, potentially augmenting the efficacy of conventional treatments. This review elucidates the mechanisms by which nanocarriers cross the BBB and BBTB, emphasizing the importance of physicochemical properties such as size, charge, and surface functionality. The integration of nanotechnology in GBM treatment highlights the potential for nanoparticles to revolutionize drug delivery systems, overcoming the inherent challenges posed by the BBB and the tumor microenvironment. The promise of nanomedicine advances in this field could lead to more effective therapeutic strategies, significantly impacting patient outcomes in GBM management.

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引用次数: 0

Hydrothermal synthesis of nitrogen-doped CQDs for detection of Cr6+ and removal of MB dye in wastewater

Next Nanotechnology

Pub Date : 2025-01-01 DOI: 10.1016/j.nxnano.2025.100150

Aysenur Aygun , Nihed Bennini , Rima Nour Elhouda Tiri , Idris Kaynak , Fatih Sen

Research has demonstrated the feasibility of synthesizing nitrogen-doped carbon quantum dots (CQDs) without the passivation or oxidation chemicals. Given that lemon peels are a rich, renewable carbon source and a common agricultural waste and that these peels are readily available, we chose to use them to prepare fluorescent CQDs to detect metal ions. Synthesis of N-CQDs using biowastes appears to be an environmentally friendly, fast, and efficient method. N-CQDs are preferred for sensing applications due to their various characteristic properties. N-CQDs are important for fluorescent sensors since they produce strong fluorescence emissions. In addition, since N-CQDs have high water solubility, they can work without any problems in biological and environmental sensing in aqueous solutions. The surface composition of N-CQDs was determined by Fourier transform infrared (FTIR) analysis and electronic transitions by UV–visible (UV-Vis) analysis. The morphology and average size of N-CQDs were determined by transmission electron microscope (TEM). In TEM analysis, the average particle size of the nanoparticles was determined to be 5.96 nm. N-CQDs were tested for heavy metal determination and exhibited a low detection limit of 19.37 µM for Cr⁶⁺. N-CQD exhibited 85.73 % photocatalytic activity for the degradation of methylene blue (MB) under visible light. The development of lemon peel-based N-CQDs has significant potential in environmental protection through the treatment of wastewater contaminated with MB dyes and the detection of Cr⁶⁺ metal ions.

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引用次数: 0

Marginal-zone B cells as promising targets of an mRNA-loaded, lipid-nanoparticle cancer vaccine 边缘区 B 细胞有望成为载入 mRNA 的脂质纳米粒子癌症疫苗的靶点

Next Nanotechnology

Pub Date : 2025-01-01 DOI: 10.1016/j.nxnano.2025.100154

Yuichi Suzuki , Mai Yakuwa , Mina Sato , Eleni Samaridou , Moritz Beck-Broichsitter , Masatoshi Maeki , Manabu Tokeshi , Yuma Yamada , Hideyoshi Harashima , Yusuke Sato

Combining mRNA-based cancer vaccines and lipid nanoparticles (LNPs) is a highly versatile and effective delivery technology that achieves efficient mRNA delivery to antigen-presenting cells (APCs). Marginal zone B (MZB) cells have been recognized as a promising APC target for cancer vaccines. However, no report has yet introduced a carrier that could efficiently deliver mRNA to MZB cells; hence, their potential as a target for cancer vaccines has yet to be demonstrated. In this study, we describe our application of an LNP formulation containing 15 mol% DSPC (15%DSPC) as a systemically administered cancer vaccine. The 15%DSPC selectively delivered mRNA to MZB cells, and the MZB cells subsequently accumulated in splenic follicles, which suggests a concentration of antigen proteins in the follicles. In addition, the delivery of antigen-coding mRNA to MZB cells induced MZB cell-specific major histocompatibility complex class I antigens, which was followed by cytotoxic T lymphocyte responses. Furthermore, with no signs of significant toxicity, 15%DSPC shows an anti-tumor effect that is equal to, or perhaps even better than, mRNA cancer vaccines that target dendritic cells in clinical trials. In summary, the results of this study demonstrate the efficacy of using an LNP formulation to target splenic MZB cells as a cancer vaccine. Antigen presentation and cellular immune responses were induced in an MZB cell-dependent manner, which proves that mRNA-based cancer vaccines could be effective at targeting MZB cells as APCs.

{"title":"Marginal-zone B cells as promising targets of an mRNA-loaded, lipid-nanoparticle cancer vaccine","authors":"Yuichi Suzuki , Mai Yakuwa , Mina Sato , Eleni Samaridou , Moritz Beck-Broichsitter , Masatoshi Maeki , Manabu Tokeshi , Yuma Yamada , Hideyoshi Harashima , Yusuke Sato","doi":"10.1016/j.nxnano.2025.100154","DOIUrl":"10.1016/j.nxnano.2025.100154","url":null,"abstract":"<div><div>Combining mRNA-based cancer vaccines and lipid nanoparticles (LNPs) is a highly versatile and effective delivery technology that achieves efficient mRNA delivery to antigen-presenting cells (APCs). Marginal zone B (MZB) cells have been recognized as a promising APC target for cancer vaccines. However, no report has yet introduced a carrier that could efficiently deliver mRNA to MZB cells; hence, their potential as a target for cancer vaccines has yet to be demonstrated. In this study, we describe our application of an LNP formulation containing 15 mol% DSPC (15%DSPC) as a systemically administered cancer vaccine. The 15%DSPC selectively delivered mRNA to MZB cells, and the MZB cells subsequently accumulated in splenic follicles, which suggests a concentration of antigen proteins in the follicles. In addition, the delivery of antigen-coding mRNA to MZB cells induced MZB cell-specific major histocompatibility complex class I antigens, which was followed by cytotoxic T lymphocyte responses. Furthermore, with no signs of significant toxicity, 15%DSPC shows an anti-tumor effect that is equal to, or perhaps even better than, mRNA cancer vaccines that target dendritic cells in clinical trials. In summary, the results of this study demonstrate the efficacy of using an LNP formulation to target splenic MZB cells as a cancer vaccine. Antigen presentation and cellular immune responses were induced in an MZB cell-dependent manner, which proves that mRNA-based cancer vaccines could be effective at targeting MZB cells as APCs.</div></div>","PeriodicalId":100959,"journal":{"name":"Next Nanotechnology","volume":"8 ","pages":"Article 100154"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143629028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Decentralized electrochemical biosensors for biomedical applications: From lab to home

Next Nanotechnology

Pub Date : 2025-01-01 DOI: 10.1016/j.nxnano.2024.100128

Pramod K. Kalambate , Vipin Kumar , Dhanjai

Integrated electrochemical biosensors represent the new generation of sensing tools in the biomedical field, delivering compact-sized, portable, wearable, and implantable devices. Advances in sensor fabrication methods, scalable material synthesis, microelectronics, flexible electronics, and wireless communication have enabled the evolution of biosensing devices from traditional hospital-centric systems to home-centric solutions, suitable for use by non-experts to analyze early signs of diseases. Despite these advancements, key challenges remain, including scalability, material durability, power management, and seamless integration of biosensor components into user-friendly platforms. The translation of these technologies involves strategies to overcome these challenges, such as developing cost-effective manufacturing methods and optimizing device design for real-world applications. Furthermore, the integration of these devices with the Internet-of-Things (IoT), Internet-of-Medical-Things (IoMT), artificial intelligence (AI), and machine learning (ML) algorithms has demonstrated breakthrough technological solutions for healthcare management, disease prognosis, and patient care. However, potential risks such as data security vulnerabilities, privacy concerns, and regulatory challenges must be addressed to ensure safe and ethical deployment of these technologies. Herein, we provide an in-depth analysis of the evolution of conventional electrochemical biosensors into miniaturized, integrated devices, focusing on their potential for better healthcare management and highlighting associated technical, regulatory, and ethical challenges. We also highlight key aspects of 6th generation sensing technology. Additionally, the role of IoT and AI-assisted technologies is critically discussed, presenting both their transformative benefits and the risks they pose in the biomedical field.

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引用次数: 0

Next-generation nanocomposites: Optimizing Al2O3-CuO-ZnO and reduced graphene oxide for enhanced performance

Next Nanotechnology

Pub Date : 2025-01-01 DOI: 10.1016/j.nxnano.2024.100119

Rahul Sharma , Harish Kumar , Rajni Kumari , Gaman Kumar , Bhawna Swami , Antresh Kumar , Gita Rani , Ramesh Kumar

Exceptional reduced graphene oxide-based nanocomposites (NCs) were synthesized using Al₂O₃-CuO-ZnO (ACZ) nanoparticles (NPs) through a controlled hydrothermal method. Nanomaterials with improved optical, magnetic, antibacterial, adsorption, anticorrosive, and photocatalytic characteristics were synthesized, showing synergistic behavior. To understand key structural features, the NCs were thoroughly examined using energy-dispersive X-ray analysis, SEM, X-ray diffraction, FTIR, and UV-Vis. spectroscopy. Adding ACZ NPs in the rGO matrix, increased magnetic, anticorrosive, improved antibacterial efficacy against Gram-positive bacteria, and photocatalytic activities. The NCs were exposed to sunlight and UVA and UVB light to degrade methylene blue (MB) dye i.e., 89.21 % in 75 min. The anti-corrosive characteristics (95.9 %) were examined against mild steel using a 1.0 N H₂SO₄ at room temperature at a very low concentration i.e., 10 ppm. The magnetic behavior of the NCs was examined with the help of Gouy’s balance. The induced current showed a clear relationship to the applied magnetic field strength, indicating that the NCs are paramagnetic. The antibacterial effects of the NCs were evaluated against S. aureus and E. coli at different concentrations. The ACZ@rGO NCs exhibited exceptional versatility, showing great promise for water purification, adsorption, corrosion protection, photocatalytic processes, biomedical technologies, and environmental restoration.

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引用次数: 0

Colletotrichum gloeosporioides (endophytic fungi) mediated biosynthesis of TiO2 nanoparticles for high-performance dye-sensitized solar cell

Next Nanotechnology

Pub Date : 2025-01-01 DOI: 10.1016/j.nxnano.2024.100122

Sakshi Singh , Shubham Sharma , Rajnish Bharti , Ravindra Nath Kharwar , Pankaj Srivastava

This work reports an environmentally friendly protocol for synthesizing TiO₂ nanoparticles (NPs) by utilizing endophytic fungi, Colletotrichum gloeosporioides (C. gloeosporioides). The fungi isolated from Thevetia peruviana, worked as a bio-capping agent to regulate the growing TiO₂ NPs morphology and agglomeration behavior. The formation of TiO₂ NPs was validated by surface plasmon resonance, observed using UV–vis spectroscopy. Using XRD and HRTEM, the structure, size, and shape of the as-synthesized anatase TiO₂ NPs were characterized. BET analysis was used to examine the surface area and porosity. EIS revealed the greater charge collection efficiency and enhanced electron lifetime for the TiO₂ obtained with N-3 (endophytic fungal extract). The dye-sensitized solar cell (DSSC) fabricated with bio-capped TiO₂ (N-3) photoanode exhibited greater light-to-current conversion efficiency, 3.50 %; much enhanced compared to 0.98 % obtained with un-capped TiO₂ NPs (N-1) based cell. The study demonstrated that the endophytic fungus C.gloeosporioides played a vital role in enhancing the cell performance.

{"title":"Colletotrichum gloeosporioides (endophytic fungi) mediated biosynthesis of TiO2 nanoparticles for high-performance dye-sensitized solar cell","authors":"Sakshi Singh , Shubham Sharma , Rajnish Bharti , Ravindra Nath Kharwar , Pankaj Srivastava","doi":"10.1016/j.nxnano.2024.100122","DOIUrl":"10.1016/j.nxnano.2024.100122","url":null,"abstract":"<div><div>This work reports an environmentally friendly protocol for synthesizing TiO<sub>2</sub> nanoparticles (NPs) by utilizing endophytic fungi, <em>Colletotrichum gloeosporioides (C. gloeosporioides)</em>. The fungi isolated from Thevetia peruviana, worked as a bio-capping agent to regulate the growing TiO<sub>2</sub> NPs morphology and agglomeration behavior. The formation of TiO<sub>2</sub> NPs was validated by surface plasmon resonance, observed using UV–vis spectroscopy. Using XRD and HRTEM, the structure, size, and shape of the as-synthesized anatase TiO<sub>2</sub> NPs were characterized. BET analysis was used to examine the surface area and porosity. EIS revealed the greater charge collection efficiency and enhanced electron lifetime for the TiO<sub>2</sub> obtained with N-3 (endophytic fungal extract). The dye-sensitized solar cell (DSSC) fabricated with bio-capped TiO<sub>2</sub> (N-3) photoanode exhibited greater light-to-current conversion efficiency, 3.50 %; much enhanced compared to 0.98 % obtained with un-capped TiO<sub>2</sub> NPs (N-1) based cell. The study demonstrated that the endophytic fungus <em>C.gloeosporioides</em> played a vital role in enhancing the cell performance.</div></div>","PeriodicalId":100959,"journal":{"name":"Next Nanotechnology","volume":"7 ","pages":"Article 100122"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143146336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis of eco-friendly rGO/ZrP nanocomposite as novel adsorbents for enhanced non-enzymatic salicylic acid delivery

Next Nanotechnology

Pub Date : 2025-01-01 DOI: 10.1016/j.nxnano.2025.100142

Kalyani Adhikary, Pallabi Goswami

This research focuses on the synthesis and characterization of zirconium phosphate (ZrP) nanoparticles supported on reduced graphene oxide (rGO) and investigates their performance as adsorbents for the controlled release of salicylic acid (SA). The rGO/ZrP nanocomposites were synthesized using an organometallic modification approach and comprehensively characterized utilizing a range of analytical techniques, including elemental analysis. The hybrid nanostructure leverages the high surface area and unique physicochemical properties of reduced graphene oxide (rGO), combined with the layered architecture of zirconium phosphate (ZrP), to enhance adsorption capacity and optimize release dynamics. The adsorption behavior of salicylic acid (SA) onto the zirconium phosphate framework was systematically investigated. Adsorption isotherm analyses revealed robust interactions between salicylic acid (SA) and the zirconium phosphate framework, primarily facilitated by hydrogen bonding and electrostatic forces. The adsorption kinetics followed a pseudo-second-order model, indicative of chemisorption as the prevailing mechanism, while the Langmuir isotherm model confirmed monolayer adsorption with a high binding affinity between SA and ZrP. Furthermore, the release profile of SA from the rGO/ZrP composites demonstrated a slow and sustained release over time. These results highlight the potential of ZrP-based nanostructures as efficient carriers for SA, with significant prospects for environmental and agricultural applications.

{"title":"Synthesis of eco-friendly rGO/ZrP nanocomposite as novel adsorbents for enhanced non-enzymatic salicylic acid delivery","authors":"Kalyani Adhikary, Pallabi Goswami","doi":"10.1016/j.nxnano.2025.100142","DOIUrl":"10.1016/j.nxnano.2025.100142","url":null,"abstract":"<div><div>This research focuses on the synthesis and characterization of zirconium phosphate (ZrP) nanoparticles supported on reduced graphene oxide (rGO) and investigates their performance as adsorbents for the controlled release of salicylic acid (SA). The rGO/ZrP nanocomposites were synthesized using an organometallic modification approach and comprehensively characterized utilizing a range of analytical techniques, including elemental analysis. The hybrid nanostructure leverages the high surface area and unique physicochemical properties of reduced graphene oxide (rGO), combined with the layered architecture of zirconium phosphate (ZrP), to enhance adsorption capacity and optimize release dynamics. The adsorption behavior of salicylic acid (SA) onto the zirconium phosphate framework was systematically investigated. Adsorption isotherm analyses revealed robust interactions between salicylic acid (SA) and the zirconium phosphate framework, primarily facilitated by hydrogen bonding and electrostatic forces. The adsorption kinetics followed a pseudo-second-order model, indicative of chemisorption as the prevailing mechanism, while the Langmuir isotherm model confirmed monolayer adsorption with a high binding affinity between SA and ZrP. Furthermore, the release profile of SA from the rGO/ZrP composites demonstrated a slow and sustained release over time. These results highlight the potential of ZrP-based nanostructures as efficient carriers for SA, with significant prospects for environmental and agricultural applications.</div></div>","PeriodicalId":100959,"journal":{"name":"Next Nanotechnology","volume":"7 ","pages":"Article 100142"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143421784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of calcination temperature effect on crystallographic, morphological, optical, and magnetic properties of silver-doped magnesium ferrite nanoparticles

Next Nanotechnology

Pub Date : 2025-01-01 DOI: 10.1016/j.nxnano.2025.100140

Sk Hasnat Taref Zim , Md Naimur Rahman Naim , Md Alamgir Hossain , Md Sohel Sikder

Silver-doped magnesium ferrite was synthesized via the chemical co-precipitation method by calcination at temperatures of 800°C, 900°C, and 1000°C. At these temperatures, x-ray diffraction analysis measured crystalline sizes of 30.67, 31.09, and 41.32 nm while investigating calcination effects on interionic bond lengths, distances, and angles, thereby influencing superexchange interactions that determine the magnetic properties. SEM images showed well-defined nanoparticle sizes ranging from 349.36 to 685.53 nm, with a variation in crystal number containing 11–17. UV spectroscopy revealed optimal semiconductor behavior, with wide energy band gaps ranging from 4.77 to 5.07 eV. VSM studied the magnetic properties; coercivity varied from 705.88 to 478.24 Oe, while saturation magnetization decreased from 65.05 to 44.41 emu/g as the crystalline size increased. Notably, among the different calcination temperatures for the AMSF nanoparticles, the sample calcined at 800°C demonstrated the best performance.

{"title":"Investigation of calcination temperature effect on crystallographic, morphological, optical, and magnetic properties of silver-doped magnesium ferrite nanoparticles","authors":"Sk Hasnat Taref Zim , Md Naimur Rahman Naim , Md Alamgir Hossain , Md Sohel Sikder","doi":"10.1016/j.nxnano.2025.100140","DOIUrl":"10.1016/j.nxnano.2025.100140","url":null,"abstract":"<div><div>Silver-doped magnesium ferrite was synthesized via the chemical co-precipitation method by calcination at temperatures of 800°C, 900°C, and 1000°C. At these temperatures, x-ray diffraction analysis measured crystalline sizes of 30.67, 31.09, and 41.32 nm while investigating calcination effects on interionic bond lengths, distances, and angles, thereby influencing superexchange interactions that determine the magnetic properties. SEM images showed well-defined nanoparticle sizes ranging from 349.36 to 685.53 nm, with a variation in crystal number containing 11–17. UV spectroscopy revealed optimal semiconductor behavior, with wide energy band gaps ranging from 4.77 to 5.07 eV. VSM studied the magnetic properties; coercivity varied from 705.88 to 478.24 Oe, while saturation magnetization decreased from 65.05 to 44.41 emu/g as the crystalline size increased. Notably, among the different calcination temperatures for the AMSF nanoparticles, the sample calcined at 800°C demonstrated the best performance.</div></div>","PeriodicalId":100959,"journal":{"name":"Next Nanotechnology","volume":"7 ","pages":"Article 100140"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143421786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Photoelectrochemical CO2 reduction on CuO-Cu2O nanocomposites with noble metal co-catalysts enhances the production of C1 oxygenates and acetate

Next Nanotechnology

Pub Date : 2025-01-01 DOI: 10.1016/j.nxnano.2024.100125

Tahereh Mokary Yazdely, Ricard Garcia-Valls, Alberto Puga

Multi-junction copper oxide nanocomposite photocathodes formed by CuO nanowire arrays coated with Cu₂O nanopyramids or stacked nanoprisms, i.e. CuO(NWA)|Cu₂O(NPy), exhibit remarkable electrochemical stability toward reductive corrosion. Whilst bare CuO nanowires are extremely prone to decomposition even at the mildest potentials applied, the core@shell morphology of CuO(NWA)|Cu₂O(NPy) resists cathodic potentials up to −0.7 V (vs. AgCl/Ag). Precisely controlled electrodeposition of silver or gold nanoparticles resulted in Ag nanotrails arranged on flatter surface regions in CuO(NWA)|Cu₂O(NPy)|Ag, whereas Au nanoaggregates were deposited on both flat areas and prominent apexes in CuO(NWA)|Cu₂O(NPy)|Au. Photocurrent measurements demonstrated redox process activation, namely above three-fold current density increases, by light for CuO(NWA)|Cu₂O(NPy). The participation of CO₂ in them was also confirmed by around 70 % photocurrent increases (higher than 0.2 mA cm⁻²) and by sensibly milder cathodic potential onsets (≤ −0.4 V), as recorded by linear sweep voltammetry. Photoelectrochemical CO₂ reduction experiments under simulated sunlight yielded oxygenated products in the liquid phase, chiefly formate, although acetate was also consistently produced, especially in the presence of noble metal co-catalysts. Specifically, acetate yields increased by 30–40 % for CuO(NWA)|Cu₂O(NPy)|Ag and CuO(NWA)|Cu₂O(NPy)|Au up to 56 and 54 μM, respectively. Methanol could be also formed under specific conditions. A mechanistic proposal is postulated to account for all stability and selectivity phenomena observed.

{"title":"Photoelectrochemical CO2 reduction on CuO-Cu2O nanocomposites with noble metal co-catalysts enhances the production of C1 oxygenates and acetate","authors":"Tahereh Mokary Yazdely, Ricard Garcia-Valls, Alberto Puga","doi":"10.1016/j.nxnano.2024.100125","DOIUrl":"10.1016/j.nxnano.2024.100125","url":null,"abstract":"<div><div>Multi-junction copper oxide nanocomposite photocathodes formed by CuO nanowire arrays coated with Cu<sub>2</sub>O nanopyramids or stacked nanoprisms, <em>i.e.</em> CuO(NWA)|Cu<sub>2</sub>O(NPy), exhibit remarkable electrochemical stability toward reductive corrosion. Whilst bare CuO nanowires are extremely prone to decomposition even at the mildest potentials applied, the core@shell morphology of CuO(NWA)|Cu<sub>2</sub>O(NPy) resists cathodic potentials up to −0.7 V (<em>vs</em>. AgCl/Ag). Precisely controlled electrodeposition of silver or gold nanoparticles resulted in Ag nanotrails arranged on flatter surface regions in CuO(NWA)|Cu<sub>2</sub>O(NPy)|Ag, whereas Au nanoaggregates were deposited on both flat areas and prominent apexes in CuO(NWA)|Cu<sub>2</sub>O(NPy)|Au. Photocurrent measurements demonstrated redox process activation, namely above three-fold current density increases, by light for CuO(NWA)|Cu<sub>2</sub>O(NPy). The participation of CO<sub>2</sub> in them was also confirmed by around 70 % photocurrent increases (higher than 0.2 mA cm<sup>−2</sup>) and by sensibly milder cathodic potential onsets (≤ −0.4 V), as recorded by linear sweep voltammetry. Photoelectrochemical CO<sub>2</sub> reduction experiments under simulated sunlight yielded oxygenated products in the liquid phase, chiefly formate, although acetate was also consistently produced, especially in the presence of noble metal co-catalysts. Specifically, acetate yields increased by 30–40 % for CuO(NWA)|Cu<sub>2</sub>O(NPy)|Ag and CuO(NWA)|Cu<sub>2</sub>O(NPy)|Au up to 56 and 54 μM, respectively. Methanol could be also formed under specific conditions. A mechanistic proposal is postulated to account for all stability and selectivity phenomena observed.</div></div>","PeriodicalId":100959,"journal":{"name":"Next Nanotechnology","volume":"7 ","pages":"Article 100125"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143146333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0