Nano-Structures & Nano-Objects最新文献

{"title":"The prospective contribution of kesterites to next-generation technologies","authors":"Mohammad Istiaque Hossain ,&nbsp;Puvaneswaran Chelvanathan ,&nbsp;Abdelmajid Salhi ,&nbsp;Brahim Aissa","doi":"10.1016/j.nanoso.2025.101480","DOIUrl":"10.1016/j.nanoso.2025.101480","url":null,"abstract":"<div><div>Kesterite-based Cu₂ZnSn(S,Se)₄ (CZTSSe) thin films have emerged as versatile and sustainable materials for a wide spectrum of next-generation technologies, including solar photovoltaics, photodetectors, sensors, thermoelectric devices, photoelectrochemical water splitting, energy storage systems (such as lithium-ion batteries and supercapacitors), and even antibacterial treatments. In the realm of photovoltaics, CZTSSe thin-film solar cells have achieved a notable power conversion efficiency of 12.6 %. This review delves into both encapsulated and non-encapsulated device structures, examining their structural stability and degradation mechanisms over time. The key advantages of CZTSSe include their earth-abundant, non-toxic composition, tunable optoelectronic properties, and compatibility with low-cost, scalable fabrication techniques. Such material has favorable empirical properties at both the nano- and micro-level, such as a tunable direct bandgap (∼1.0–1.5 eV), high absorption coefficient (&gt;10⁴ cm⁻¹), earth-abundant and non-toxic elemental composition, and potential for low thermal conductivity—traits that are especially beneficial for photovoltaic and thermoelectric applications. These features strongly align with global sustainability goals and the principles of a circular economy, particularly through reduced environmental impact and the potential for recycling. The review also addresses critical challenges related to stability, reproducibility, and ageing effects, providing insights into defect passive action, interface engineering, and compositional tuning to enhance long-term performance. Additionally, the potential of CZTSSe for material and energy storage is thoroughly explored, reinforcing the material’s promise beyond traditional photovoltaics. By presenting recent advancements, fabrication strategies, and emerging multifunctional applications, this review underscores the transformative potential of CZTSSe in shaping a sustainable technological future.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"42 ","pages":"Article 101480"},"PeriodicalIF":5.45,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143868001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Performance of TiO2-SiC nanomaterials on morphology and sorption behavior of PVA-PEG-based nanocomposites for UV-applications and antibacterial efficacy","authors":"Nawras T. Sheehab ,&nbsp;Fouad Sh. Hashim ,&nbsp;Ehssan Al-Bermany ,&nbsp;Ahmed Najm Obaid ,&nbsp;Karar Abdali ,&nbsp;Adel H. Omran Alkhayatt","doi":"10.1016/j.nanoso.2025.101479","DOIUrl":"10.1016/j.nanoso.2025.101479","url":null,"abstract":"<div><div>This work exhibits the incorporation of TiO₂-SiC nanoparticles (NPs) for the first time via a green and cost-effective route. It examines their loading into a polymeric matrix (PM) composed of polyvinyl alcohol (PVA) and polyethylene glycol (PEG) at several weight percentages (wt%) via a casting way. The Fourier transform infrared spectroscopy (FTIR) revealed the chemical properties. Field emission scanning electron microscopy (FESEM) confirmed that the surface morphology of PM is rough and homogenous. Furthermore, the insertion of lower filler loadings of TiO₂-SiC NPs was uniformly and well dispersed through the PM, reducing aggregations. It is rough and homogenous. The compositional elements were achieved using EDXs. The optical absorbance values were boosted by 85 % at a wavelength of 260 nm, decreasing the indirect bandgaps by 47.5 %, from 4.58 eV to 2.40 eV (Tauc model) and from 4.83 eV to 2.60 eV (ASF model) upon SiC ratio reaching 2.5 wt%. The AC conductivity values were improved upon loading from 3.30 × 10⁻⁹ S.cm⁻¹ to 3.52 × 10⁻⁹ S.cm⁻¹ at 100 Hz, and the dielectric constant was higher than PM finding with maintained low dielectric loss. The strongest activity and the greatest inhibitory zone of about 24 mm <em>Staphylococcus aureus</em> (gram-positive) appeared at a ratio of 2.5 wt% SiC. From the results obtained, these films are promising for use in UV-blocking, energy storage, and optoelectronic applications.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"42 ","pages":"Article 101479"},"PeriodicalIF":5.45,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143829063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Photochemical and electrochemical synthesis of [rGO–AuNps] hybrids dispersions for detection of rhodamine 6G by SERS","authors":"Juan Martín Chierici ,&nbsp;Federico Fioravanti ,&nbsp;Luis A. Pérez ,&nbsp;Gabriela I. Lacconi","doi":"10.1016/j.nanoso.2025.101478","DOIUrl":"10.1016/j.nanoso.2025.101478","url":null,"abstract":"<div><div>Many hybrid nanomaterials with different types of metallic nanostructures have been studied for diverse applications. Herein, we present four simple experimental strategies, combining photochemical and electrochemical reduction steps to obtain aqueous dispersions of hybrid nanomaterials of reduced graphene oxide flakes (rGO) supporting gold nanoparticles (AuNps). We found clear differences in the optical, structural, and morphological characteristics of the <strong>[rGO–AuNps]</strong> hybrids due to the size, shape, and distribution of AuNps, according to the synthesis strategy employed. These characteristics are associated with the degree of reduction (C/O ratio composition) and structural defects (Raman intensity ratio between D and G bands) of the rGO formed, both features provide sites available for nucleation and growth of the nanostructures, obtained in each synthesis. The efficiency of different dispersions with plasmonic activity in the detection of rhodamine 6 G (Rh6G) from dilute aqueous solutions was spectroscopically evaluated. SERS (Surface-Enhanced Raman spectroscopy) experiments were performed directly on cellulose fibers (filter paper), previously modified with the assembly of the hybrid nanomaterials, and the Rh6G molecules. In this way, a practical and simple configuration with nanomaterials has been established, as a platform designed for the sensitive detection of adsorbed molecules, potentially useful during the filtration of contaminated water. The SERS spectra of adsorbed Rh6G on the paper membranes with the hybrids <strong>[rGO]</strong>^{<strong>hυ</strong>} <strong>–[AuNps]</strong>^{<strong>hυ</strong>} and <strong>[rGO]</strong>^{<strong>hυ</strong>}<strong>–[AuNps]</strong>^{<strong>ec</strong>} for 48 h immersion, showed a 23 ± 5 and 21 ± 5 enhancement factor (EF), respectively.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"42 ","pages":"Article 101478"},"PeriodicalIF":5.45,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143820820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Green fabrication of novel LaCeO₃ decorated with CuO using Kigelia africana (lamb) benth leaf extract for photocatalytic degradation of malachite green","authors":"Rahma Demy Fitria Irbati ,&nbsp;Dewangga Oky Bagus Apriandanu ,&nbsp;Mike Rahayu ,&nbsp;Vatra Reksa Ananda ,&nbsp;Muh. Risky Yusuf ,&nbsp;Sheela Chandren ,&nbsp;Yoki Yulizar","doi":"10.1016/j.nanoso.2025.101474","DOIUrl":"10.1016/j.nanoso.2025.101474","url":null,"abstract":"<div><div>This study successfully synthesized a novel LaCeO₃/CuO nanocomposite using a green synthesis method mediated by <em>Kigelia africana</em> leaf extract (KALE). LaCeO₃ is a perovskite with a significantly high band gap value between 3 and 3.19 eV. The combination with CuO, a cost-effective material that has a lower band gap of 1.2–2 eV, aims to reduce the overall band gap. This material modification will result in a heterojunction structure that boosts its photocatalytic performance. Characterization techniques such as FT-IR, UV-Vis DRS, XRD, HR-TEM, FESEM-EDX, and XPS validated the effective creation of the nanocomposite, which exhibited a unique morphology and a type S heterojunction structure. The LaCeO₃/CuO nanocomposite exhibited a bandgap energy of 2.88 eV, placing it within the visible light spectrum. Experiments assessing its photocatalytic performance demonstrated that the LaCeO₃/CuO nanocomposite effectively decomposed malachite green (MG) under visible light, achieving a maximum degradation efficiency of 92.88 % within 120 minutes. Kinetic investigations indicated that the reaction follows pseudo-first-order kinetics, exhibiting a rate constant of 6.19 × 10⁻² min⁻¹ . The ideal mass of the photocatalyst for the degradation of MG was found to be 30 mg. The study also investigated the influence of various factors, such as pH, the presence of anions, and the role of reactive oxygen species (ROS), affected photocatalytic activity. Results indicated that the LaCeO₃/CuO nanocomposite exhibited optimal performance in neutral to mildly alkaline conditions. The presence of anions, particularly Cl⁻ and SO₄²⁻, negatively impacted photocatalytic activity. Furthermore, the LaCeO₃/CuO nanocomposite demonstrated excellent reusability, maintaining high degradation efficiency over three consecutive cycles. These results emphasize the possible of the green-synthesized LaCeO₃/CuO nanocomposite as a promising and sustainable photocatalyst for the effective removal of organic pollutants from wastewater.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"42 ","pages":"Article 101474"},"PeriodicalIF":5.45,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143790892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Complete carbohydrate-based synthetic strategy for an efficient plasmonic metal and alloy nanostructured SERS substrate","authors":"Sumitha Chandran ,&nbsp;Bijal K. Bahuleyan ,&nbsp;Shibin Thomas","doi":"10.1016/j.nanoso.2025.101476","DOIUrl":"10.1016/j.nanoso.2025.101476","url":null,"abstract":"<div><div>Surface enhanced Raman spectroscopy (SERS) has grown to be one of the most effective spectroscopic methods with a wide range of applications since the discovery of enhanced spectrum of pyridine on a silver electrode. However, the challenges in fabricating an affordable, simple, and long-lasting substrate restricts its application in devices. In this study, we report for the first time on a novel, inexpensive polymer-based SERS substrate made by thermally evaporating colloidal solutions of metal and alloy nanoparticles over humid sheets of cellulose acetate (CA). Green synthetic strategies were adopted for preparing nanoparticles using glucose as the reducing agent and starch as the capping agent. Au, Ag and their alloys decorated CA sheets were prepared, and the nanoparticle formation is confirmed by UV-Visible absorption spectroscopy. Diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDAX), atomic force microscopy (AFM) and Fourier transform infra-red (FT-IR) spectroscopy were used for the characterization of the nanoparticle decorated CA sheets. 1,4-benzenedithiol (1,4-BDT) is used as the Raman active molecule for SERS studies. A noticeably greater Raman enhancement was observed using these sheets, demonstrating the potential of these substrates for use in SERS-based devices.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"42 ","pages":"Article 101476"},"PeriodicalIF":5.45,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143739933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nano-engineered magnesium-enriched sugarcane bagasse for dual decontamination of heavy metals and E. coli in sewage water","authors":"Rehab F. Mohamed ,&nbsp;Ahmed A. Afifi ,&nbsp;Mohamed Azab El-Liethy ,&nbsp;Hossam F. Nassar","doi":"10.1016/j.nanoso.2025.101475","DOIUrl":"10.1016/j.nanoso.2025.101475","url":null,"abstract":"<div><div>Sugarcane bagasse (SCB) is a fibrous lignocellulosic waste formed when sugarcane is crushed to extract juice for ethanol and sugar manufacture. The study's goal was to look at how chemical alteration affects the properties of SCB combined with Mg and how successful it is at removing three heavy metals including (Copper (Cu^2 +), Zinc (Zn²⁺), and Lead (Pb²⁺)) as well as <em>Escherichia coli</em> (<em>E. coli</em>) from contaminated wastewater. The chemical and physical characteristics of the biochar generated were investigated at temperatures of 600°C and 800°C using the Brunauer-Emmett-Teller (BET) surface area analyzer, thermo gravimetric analysis (TGA), Fourier transform infrared (FTIR) peak analysis, and energy dispersive X-ray (EDS). A batch sorption test was carried out to determine the ability of sugarcane bagasse biochar (SCBB) to adsorb Cu, Pb, and Zn from solution. The adsorption data were examined using the Langmuir and Freundlich adsorption isotherms. The results indicate that the Langmuir isotherm model produced the best precise match. An accurate estimate for employing SCBB as a biosorbent material was used in sewage and industrial wastewater (contact time one hour, optimal dosage 800 ppm). The SCBB achieves maximum removal rates of 81.4, 83.5, and 89.2 % for biological oxygen demand (BOD), chemical oxygen demand (COD), and total suspended solids (TSS), respectively. However, nitrate nitrogen (NO₃-N) reached 52.2 %, while total phosphorus (TP) reached 63.2 %. Pb, Zn, and Cu were completely removed. The minimum inhibitory concentration (MIC) of SCBB against <em>E. coli</em> was 600 mg/mL. <em>E. coli</em> is completely eradicated from wastewater using 800 mg/L of SCBB in one hour. The present study developed potent, cost-effective, ecofriendly and multifunctional adsorbent of MgO-modified SCBB for safely wastewater de-pollution as a promising environmental remediation technology.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"42 ","pages":"Article 101475"},"PeriodicalIF":5.45,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Laser-assisted synthesis of metakaolin/Pd nanocomposite and its application as catalyst in wastewater remediation","authors":"Babak Jaleh ,&nbsp;Ahmadreza Sahraei ,&nbsp;Mahtab Eslamipanah ,&nbsp;Fatemeh Seifikar ,&nbsp;Saeid Azizian ,&nbsp;Sara Jalali ,&nbsp;Stefan Enghardt ,&nbsp;Benjamin Kruppke ,&nbsp;Hossein Ali Khonakdar ,&nbsp;Manoj B. Gawande","doi":"10.1016/j.nanoso.2025.101471","DOIUrl":"10.1016/j.nanoso.2025.101471","url":null,"abstract":"<div><div>Developing industrial activity and changing climate worldwide increase water contaminants and reduce safe water resources. Therefore, wastewater treatment and the removal or reduction of water contaminants have become important challenges. Affordable nanocatalysts for wastewater treatment are an effective solution to overcome this problem. Fabrication of a new type of metakaolin/Pd nanocomposite (MK/Pd) facilitates the reduction of noxious methyl orange and Cr(VI). This nanocomposite was manufactured based on the deposition of Pd NPs on the MK. In this study, the MK was first synthesized through a one-step heat treatment process at -750 °C for 4 h. Meanwhile, the laser ablation of Pd target in deionized water was also applied as a fast and chemical-free technique to prepare colloidal Pd nanoparticles (NPs). The samples were analyzed using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and BET analysis. The structural investigations indicated that MK surfaces with rough platy morphology were decorated with Pd NPs with an average crystallite size of 42 nm. The catalytic performance of the MK/Pd was also investigated for the reduction of methyl orange (MO) and Cr(VI) in an aqueous medium employing sodium borohydride or formic acid. The progress of reactions was monitored using UV–Vis spectroscopy, suggesting that the as-fabricated nanocomposite delivers very rapid reduction of both Cr(VI) (45 s) and MO (400 s). Compared to MO, Cr(VI) reduced ten times faster.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"42 ","pages":"Article 101471"},"PeriodicalIF":5.45,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143679919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Recent advancements in nanostructured flame-retardants: Types, mechanisms, and applications in polymer composites","authors":"Manoj Kumar Singh ,&nbsp;Sanjay Mavinkere Rangappa ,&nbsp;Manjusri Misra ,&nbsp;Amar K. Mohanty ,&nbsp;Suchart Siengchin","doi":"10.1016/j.nanoso.2025.101468","DOIUrl":"10.1016/j.nanoso.2025.101468","url":null,"abstract":"<div><div>Nanostructured flame-retardants offer an innovative approach to improve the fire safety of materials while addressing performance, environmental, and health challenges associated with traditional flame-retardants (FRs). By utilizing nanoscale FRs such as CNTs, nanoclays, nanoparticles, graphene, and metal-organic frameworks, unique flame retardancy mechanism can be obtained. Nanostructured flame-retardants enhance the fire resistance of polymer and polymer composites through heat dissipation, barrier effects, and char promotion, significantly reducing heat and gas transfer. Furthermore, the high specific surface area of nanostructured flame-retardants ensures effective dispersion within the polymer matrix without compromising thermal or mechanical properties. These materials also provide multi-functional properties such as electrical conductivity and thermal conductivity along with flame retardancy. Due to its multi-functional properties, these materials have various applications in different industries such as construction, electronics, automotive, and aerospace. However, challenges such as compatibility with polymers, potential environmental impacts and scalability are the critical areas, which need more focus in ongoing research. This review is mainly focused on nanostructured flame-retardants and their types, mechanisms and applications of flame-retardant polymer composites, emphasizing recent advancements. It also highlights their role in improving material sustainability and discusses challenges and future directions. Nanostructured flame-retardants offer a promising path toward safer, more efficient, and sustainable fire-resistant materials, meeting the increasing demand for multifunctional and ecofriendly solutions across key industries.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"42 ","pages":"Article 101468"},"PeriodicalIF":5.45,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143654742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermal-induced structural behavior in CaO-doped ZrO2 nanocrystals: A high-temperature synchrotron XRD and XAS study","authors":"Budi Hariyanto ,&nbsp;Sufilman Ely ,&nbsp;Allif Rosyidy Hilmi ,&nbsp;Suttipong Wannapaiboon ,&nbsp;Krongthong Kamonsuangkasem ,&nbsp;Chatree Saiyasombat ,&nbsp;Holilah ,&nbsp;Sri Yani Purwaningsih ,&nbsp;Malik Anjelh Baqiya ,&nbsp;Retno Asih ,&nbsp;Suminar Pratapa","doi":"10.1016/j.nanoso.2025.101470","DOIUrl":"10.1016/j.nanoso.2025.101470","url":null,"abstract":"<div><div>The crystal and local structures of nanocrystalline undoped and CaO-doped ZrO₂ were investigated using high-temperature synchrotron X-ray powder diffraction (XRD) and X-ray absorption spectroscopy (XAS). Nanocrystalline ZrO₂ was synthesized via a co-precipitation method, whereas CaO-doped ZrO₂ was prepared through mechanochemical wet milling, using CaO derived from natural limestone as the dopant. High-temperature synchrotron XRD analysis showed the transformation of undoped and CaO-doped ZrO₂ from an amorphous state to a tetragonal phase, stable up to 1100 °C. The CaO-doped ZrO₂ required higher temperatures to achieve a fully tetragonal transformation compared to the undoped sample. At equivalent temperatures, Ca doping induced larger lattice parameters, reduced tetragonality, and slower unit-cell volume contraction. However, CaO-doped ZrO₂ with 5.0 mol% CaO dopant concentration following fast cooling at a rate of 50 °C/min induced the formation of minor phases, specifically m-ZrO₂ and CaZrO₃. Furthermore, in situ extended X-ray absorption fine structure (EXAFS) analysis at 700 and 800 °C revealed that the Ca dopant elongated Zr-O_I bonds by substituting Zr⁴⁺ with larger Ca²⁺ ions and forming oxygen vacancies, effectively suppressing atomic vibrations. The results reported here point out the structural adaptability of CaO-doped ZrO₂ nanocrystals, reinforcing their suitability for high-temperature applications.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"42 ","pages":"Article 101470"},"PeriodicalIF":5.45,"publicationDate":"2025-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143637041","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Green synthesis of α-MnO2/Ag nanocomposite using Malva parviflora (Khabbaz) extract for antimicrobial activity","authors":"Saja Q. Ali ,&nbsp;Duha A. Kadhim ,&nbsp;Asmaa Hadi Mohammed ,&nbsp;Raghad S. Mohammed ,&nbsp;Muslim A. Abid ,&nbsp;Sara A. Athari","doi":"10.1016/j.nanoso.2025.101467","DOIUrl":"10.1016/j.nanoso.2025.101467","url":null,"abstract":"<div><div>The green synthesis method was used to make alpha manganese dioxide (α-MnO₂), silver nanoparticles (Ag NPs), and alpha-manganese dioxide/silver nanocomposite (α-MnO₂/Ag NCs) from the <em>Malva parviflora plant leaves</em> extract. The XRD patterns, FE-SEM analysis, AFM device, EDX spectrum, and UV–visible spectrum were used to characterize the α-MnO₂ NPs, Ag NPs, and α-MnO₂/Ag NCs. Crystal structure and crystal size values were determined through XRD patterns. The XRD results show that α-MnO₂ NPs, Ag NPs, and α-MnO₂/Ag NCs have a tetragonal and cubic shape, with crystallite sizes ranging from 13 to 25 nm, 14–38 nm, and 13–40 nm, respectively. This study also used FE-SEM to show that the α-MnO₂ NPs, Ag NPs, and α-MnO₂/Ag NCs particles are very small, measuring 38.44, 30.04, and 58.07 nm, in that order. The AFM scans showed that the α-MnO₂ NPs, Ag NPs, and α-MnO₂/Ag NCs were half-spherical and spherical, and their sizes ranged from 72.8 to 159.3 nm. The EDX spectrum and image showed α-MnO₂ NPs, Ag NPs, and α-MnO₂/Ag NCs that were pure and had Mn and Ag in them. The UV-Vis spectrum shows the energy band gaps of 5, 5.3, and 6.2 eV for α-MnO₂ NPs, Ag NPs, and α-MnO₂/Ag NCs, respectively. The diffusion method was used to look at the areas where α-MnO₂ NPs, Ag NPs, and α-MnO₂/Ag NCs stopped bacteria from growing. This study found that the inhibition zones for gram-positive bacteria (Staphylococcus aureus and staphylococcus epidemidis) were 16.00–19.00 % mm, 14.00–17.00 mm, and 15.00–17.67 mm in size. For gram-negative bacteria (Escherichia coli and Klebsiella pneumonia), they were 13.00–16.00 mm, 13.00–14.00 mm, and 14.00–20.67 mm in size. For fungi, the inhibition zone diameters (IZDs) were 4.67 ± 0.58 mm, 15.00 ± 0.00 mm, and 14.00 ± 0.58 mm, respectively. Using a green synthesis method to mix the <em>Malva parviflora</em> plant leaves extract with MnNO₃ and AgNO₃ salt is a pretty new idea that hasn't been seen in any study papers yet, as far as the author knows.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"42 ","pages":"Article 101467"},"PeriodicalIF":5.45,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143619761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}