Materials Advances最新文献

{"title":"A ring-fluorinated heptamethine cyanine dye: synthesis, photophysical properties, and vapochromic properties in response to ammonia†","authors":"Shouhei Ajioka, Yuto Hagiyama, Yuki Uehashi, Tomohiro Agou, Yasuhiro Kubota, Toshiyasu Inuzuka and Kazumasa Funabiki","doi":"10.1039/D4MA00962B","DOIUrl":"https://doi.org/10.1039/D4MA00962B","url":null,"abstract":"<p >Heptamethine cyanine dyes (HMCDs) have attracted considerable attention in biological and energy applications owing to their unique near-infrared (NIR) photophysical properties. Therefore, the development of molecules that change both visible and fluorescent colours in a stimulus-responsive manner by exploiting the NIR optical properties of HMCDs has been a subject of increasing interest. Most research results are based on a highly nucleophilic anion addition or reversible <em>intramolecular</em> addition reaction of a <em>weakly nucleophilic neutral nucleophile</em> with the C<img>N bond of the terminal indol-1-ium moiety. Examples of <em>intermolecular</em> addition of weakly neutral nucleophiles and the use of solid or polymer materials are not available. Here, we report the synthesis of a NIR-absorbing ring-perfluorinated HMCD. The HMCD's unique properties in various solvents and rapid and reversible vapochromic response to various amines, including NH<small>₃</small>, based on the noteworthy structural modification induced by fluorine atoms on the aromatic ring are also presented. The ring-fluorinated HMCD adsorbed on neutral filter paper responds quickly to even low-nucleophilicity NH<small>₃</small> vapour. Repeatability tests on filter paper adsorbed with the ring-fluorinated HMCD and NH<small>₃</small> and HCl vapours show excellent reproducibility in 13 blue-green and yellow colour transitions. These results are the first examples of intermolecular addition of weakly neutral nucleophiles into HMCDs and stimulus responsiveness not in solutions.</p>","PeriodicalId":18242,"journal":{"name":"Materials Advances","volume":" 24","pages":" 9792-9808"},"PeriodicalIF":5.2,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ma/d4ma00962b?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142790274","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}

{"title":"Unveiling the synergic potential of dual junction MoSe2/n-Ga2O3/p-GaN heterojunctions for ultra-broadband photodetection†","authors":"Vishnu Aggarwal, Manish Kumar, Rahul Kumar, Sudhanshu Gautam, Aditya Yadav, Shikha Shrivastava, Anjana Dogra, Govind Gupta, Sumeet Walia and Sunil Singh Kushvaha","doi":"10.1039/D4MA00934G","DOIUrl":"https://doi.org/10.1039/D4MA00934G","url":null,"abstract":"<p >For practical optoelectronic applications, photodetectors capable of detecting light across a wide wavelength range (200–1100 nm) are essential. Heterojunction semiconductors play a crucial role in developing such multi-wavelength photodetectors. In particular, the heterojunction of transition metal chalcogenides (tuneable bandgap and high electron mobility) and Ga<small>₂</small>O<small>₃</small> (wide bandgap of &gt;4 eV) is a significant research topic for photodetector fabrication exhibiting an ultrawide spectral photodetection capability. In this study, epitaxial β-Ga<small>₂</small>O<small>₃</small> thin films were grown on atomically flat sapphire (0001) and p-GaN/sapphire (0001) surfaces using a pulsed laser deposition technique. The effect of the substrate on the crystalline, optical, electronic, and photoresponse properties of β-Ga<small>₂</small>O<small>₃</small> thin films was thoroughly investigated and correlated with theoretical insights from density functional theory. To achieve broadband photodetection, a heterojunction of MoSe<small>₂</small> and the as-grown Ga<small>₂</small>O<small>₃</small> films was fabricated, enabling light detection from the deep ultraviolet (UV) to the near-infrared (NIR) spectral regions. The MoSe<small>₂</small>/Ga<small>₂</small>O<small>₃</small>/p-GaN device exhibited an expanded detection range from deep ultraviolet (240–320 nm) to long-wavelength ultraviolet (320–400 nm) and a significant responsivity of 5.5 A W<small>⁻¹</small> in the NIR region, nearly fourfold higher than that of the MoSe<small>₂</small>/Ga<small>₂</small>O<small>₃</small>/sapphire device. These results highlight the potential of these hybrid structures for developing multi-wavelength photodetectors with high photoresponse across the deep-UV to NIR spectral regions, offering promising applications in fields ranging from environmental monitoring to communications.</p>","PeriodicalId":18242,"journal":{"name":"Materials Advances","volume":" 24","pages":" 9744-9755"},"PeriodicalIF":5.2,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ma/d4ma00934g?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142790267","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}

{"title":"Screen-printed wearable sensors for continuous respiratory rate monitoring: fabrication, clinical evaluation, and point-of-care potential†","authors":"Ala’aldeen Al-Halhouli, Ahmed Albagdady, Alexander Rabadi, Musab Hamdan, Jumana Abu-Khalaf and Mahmoud Abu-Abeeleh","doi":"10.1039/D4MA00510D","DOIUrl":"https://doi.org/10.1039/D4MA00510D","url":null,"abstract":"<p >In this paper, we investigated the use of screen printing for the fabrication of a non-invasive wearable sensor, aimed at achieving accurate and continuous measurement of respiratory rate. The developed sensor was clinically evaluated on 15 healthy human participants, demonstrating its potential for point-of-care testing. Wearable sensors are emerging as the future of continuous healthcare monitoring by recording crucial physiological parameters that can be processed to monitor existing health conditions and predict future ones. Having a reliable tool to monitor respiratory rate is extremely valuable for healthcare professionals since it can indicate disease progression under certain conditions like COPD (chronic obstructive pulmonary disease) and COVID-19. The developed sensor was printed on a stretchable substrate consisting of repeated silver horseshoe patterns to avoid stress concentration and ensure conductivity at higher strains. By tracking changes in electrical resistance under strain, the sensor derived respiration frequency when placed on the chest. The clinical evaluation involved testing the sensor on 15 healthy human participants, aged 21–24, in sitting, standing, and Fowler's 45° positions, and a temperature-based airflow sensor was used as a reference. The screen-printed sensor accurately measured the respiratory rates with an error of 0.055 breaths per minute (bpm) demonstrating its accuracy and potential for point-of-care healthcare applications.</p>","PeriodicalId":18242,"journal":{"name":"Materials Advances","volume":" 24","pages":" 9586-9595"},"PeriodicalIF":5.2,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ma/d4ma00510d?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142790298","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}

{"title":"Electric field and strain mediated zinc blende ZnSe: exploring its potential as a controlled stimulus responsive optical and optoelectronic material","authors":"Fakhar E. Alam, Basharat Ali and Suneela Arif","doi":"10.1039/D4MA00885E","DOIUrl":"https://doi.org/10.1039/D4MA00885E","url":null,"abstract":"<p >Herein, we reveal how stimuli precisely tune and tailor the optoelectronic response of zinc blende ZnSe, making it a candidate for advanced spintronic and optoelectronic technologies. Stimulus-driven bandgap engineering <em>via</em> electric fields and mechanical strain induces dynamic modulation: the bandgap narrows from 0.6 eV to 0.36 eV and widens from 0.67 eV to 1.45 eV under positive and negative electric fields, respectively, due to the Stark effect and phase transitions influenced by electron–electron interactions and the Mott transition. Compressive strain increases the bandgap from 1.6 eV to 2.45 eV, while tensile strain decreases it from 1.6 eV to 0.94 eV. We also investigate the effects of stimuli on the partial and total density of states, charge density, local density of states, and charge transfer, emphasizing the role of Zn (2s, 3d) and Se (2p) orbitals. The HOMO–LUMO gap analysis shows that electric fields enhance stability, while strain reduces it. Additionally, dynamic modulation of optical parameters—such as the dielectric function, refractive index, reflectivity, extinction coefficient, and conductivity—demonstrates controlled optoelectronics. Our findings highlight the potential of stimuli to significantly and dynamically modulate ZnSe electronic and optoelectronic properties, paving the way for innovative miniaturized optoelectronic technologies.</p>","PeriodicalId":18242,"journal":{"name":"Materials Advances","volume":" 24","pages":" 9656-9672"},"PeriodicalIF":5.2,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ma/d4ma00885e?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142790284","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}

{"title":"Promising single crystal host for bulk scintillators: luminescence and energy migration in (Gd,Y)AlO3","authors":"Monika Kotyková, Romana Kučerková, Alena Beitlerová, Vladimir Babin, Vítězslav Jarý, Jan Touš, Jan Polák, Karel Blažek and Martin Nikl","doi":"10.1039/D4MA00932K","DOIUrl":"https://doi.org/10.1039/D4MA00932K","url":null,"abstract":"<p >The optical and photoluminescent characteristics of the heavy perovskite (Gd<small>_0.40</small>,Y<small>_0.60</small>)AlO<small>₃</small> single crystal were evaluated. Typical Gd<small>³⁺</small> transitions were observed in the absorption spectrum. The photoluminescent kinetics and temperature dependence of the Gd<small>³⁺</small> emission line at 312 nm were examined in order to study the energy migration within the Gd<small>³⁺</small> sublattice. In comparison to multicomponent (Gd,Y)<small>₃</small>(Ga,Al)<small>₅</small>O<small>₁₂</small> garnet, the migration in (Gd<small>_0.40</small>,Y<small>_0.60</small>)AlO<small>₃</small> was demonstrated to be more rapid and more efficient at lower temperatures. The radioluminescent spectrum demonstrated the existence of accidental impurities, namely Ce<small>³⁺</small>, Fe<small>³⁺</small> and Cr<small>³⁺</small>, within the primary material, which were subsequently verified through the observation of their distinctive kinetic properties. In excitation spectra within the VUV-UV range at room temperature the band-to-band transition is situated at about 180 nm, in which also an efficient excitation of Ce<small>³⁺</small> emission occurs. Such a host paves the way to economic industrial production of heavy aluminum perovskite-based single crystal scintillators.</p>","PeriodicalId":18242,"journal":{"name":"Materials Advances","volume":" 24","pages":" 9774-9780"},"PeriodicalIF":5.2,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ma/d4ma00932k?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142790323","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}

{"title":"Controlling ligand density and viscoelasticity in synthetic biomimetic polyisocyanide hydrogels for studying cell behaviours: the key to truly biomimetic hydrogels†","authors":"Nicholas J. Westra van Holthe, Zhao Wang, Jan Lauko, Elliot P. Gilbert, Vishaak Gangasandra and Alan E. Rowan","doi":"10.1039/D4MA00793J","DOIUrl":"https://doi.org/10.1039/D4MA00793J","url":null,"abstract":"<p >Many cell types within whole living organisms continuously sense external forces from their microenvironment through an extracellular matrix that orchestrates biophysically-cued cellular processes and mechanosensitive cell behaviours. Studying cells in 3D environments rather than in conventional 2D, is increasingly seen as a necessity for obtaining a comprehensive understanding of the dynamic and complex cell–matrix interactions and cellular responses to biophysical stimuli. While many synthetic hydrogels used in 3D cell culture applications do not provide a microenvironment that accurately mimics the structural and mechanical properties of native ECMs, ethylene-glycol grafted isocyanopeptide-based polymers (PIC) have become one of the most promising types of synthetic material for controllably mimicking endogenous ECM microenvironments based on their unique biomimetic strain-stiffening response. However, the precise effects of polymer modification through integrin-binding peptide addition and density on the nanoscale architecture of PIC polymer–peptide conjugates have not yet been comprehensively studied and the stress relaxation behaviours of PIC-based hydrogels have also yet to be comprehensively explored. Here we present new data on the structure–property relationship for PIC-based polymer–peptide conjugates by highlighting the effect of peptide addition and density on the PIC hydrogel physicochemical properties and nanoscale network structure. We show that the addition of a peptide-linker to polymer-bundle forming PIC polymers alters the polymer-bundle network structure, by potentially inhibiting the polymer-bundle formation and reducing the polymer-bundle diameter and density. Furthermore, we demonstrate the synergistic effects of ligand density, strain-stiffening responsiveness and viscoelasticity on fibroblast rapid cell spreading, morphological changes, and cytoskeleton alignment in comparison to a natural fibrin hydrogel. Cells cultured in a 6% (mol mol<small>⁻¹</small>) ligand density PIC hydrogel, with a low critical stress point and fast stress relaxation, facilitates similar spreading kinetics, spreading phenotype and F-actin cytoskeleton alignment to fibroblast cells cultured in a naturally-derived fibrin hydrogel. We find that the viscoelastic high ligand density PIC–peptide conjugate facilitates an accurate replication of fibroblast cellular behaviours in a natural matrix and that this material composition shows considerable promise for directing the optimal design of bioinspired materials for mechanotherapy and 3D cell culture.</p>","PeriodicalId":18242,"journal":{"name":"Materials Advances","volume":" 23","pages":" 9458-9470"},"PeriodicalIF":5.2,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ma/d4ma00793j?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142694725","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}

{"title":"Thermoresponsive scaffolds fabricated using covalent organic frameworks for the selective removal of water contaminants†","authors":"Safoora Gazvineh, Siamak Beyranvand, Sara Saki, Mohammad Nemati, Kai Ludwig, Patrick Amsalem, Thorstenn Schultz, Chong Cheng and Mohsen Adeli","doi":"10.1039/D4MA00792A","DOIUrl":"https://doi.org/10.1039/D4MA00792A","url":null,"abstract":"<p >Well-defined channels and inert and hydrolyzable structures of covalent organic frameworks make them excellent templates for the construction of polymeric scaffolds with a defined topology and properties. In this work, we report on the synthesis of thermoresponsive PNIPAM scaffolds templated by boronate ester COFs. Polymerization of <em>N</em>-isopropylacrylamide by azobisisobutyronitrile, encapsulated in COF channels, followed by the removal of the host framework resulted in PNIPAM scaffolds. The obtained scaffolds displayed different sizes and morphologies depending on whether polymerization was performed in the presence or absence of a crosslinking agent. In the presence of a crosslinking agent, porous PNIPAM scaffolds retained the size and the morphology of the COF, while without a crosslinking agent spindle-like microstructures were obtained. Constructed scaffolds were highly thermoresponsive and their morphology changed dramatically upon small temperature variations. This property was used for the controlled and selective removal of dye impurities from water. UV/visible absorption spectra showed that the obtained porous PNIPAM scaffold could effectively adsorb cationic and anionic dyes such as methylene blue (MB), rhodamine B (RhB), and fluorescein (FL) from wastewater. FL and RhB were effectively adsorbed by this scaffold, but a lower affinity was observed for MB. The absorption capacity of the PNIPAM1 sponge for FL, RhB and MB was 231 mg g<small>⁻¹</small>, 245 mg g<small>⁻¹</small> and 36 mg g<small>⁻¹</small>, respectively. Taking advantage of the high adsorption capacity and recyclability of the absorbant, it can be used for wastewater treatment.</p>","PeriodicalId":18242,"journal":{"name":"Materials Advances","volume":" 24","pages":" 9673-9683"},"PeriodicalIF":5.2,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ma/d4ma00792a?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142790271","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}

{"title":"White light emission and superior color stability in a single-component host with exceptional eminent color rendering and theoretical calculations on Duv for color quality†","authors":"Wasim Ullah Khan, Waheed Ullah Khan, Haris Zaman, Ayaz Mahsud, Dilfaraz Khan, Salim Ullah Khan, Shuakat Khan and Yueli Zhang","doi":"10.1039/D4MA00937A","DOIUrl":"https://doi.org/10.1039/D4MA00937A","url":null,"abstract":"<p >Correlated color temperature (CCT) is widely used to describe the chromaticity of white light sources, although chromaticity is only two-dimensional, and the distance from the Planckian locus is typically absent. Herein, a novel single-phase Ca<small>₃</small>YAl<small>₃</small>B<small>₄</small>O<small>₁₅</small>:Tm<small>³⁺</small>,Dy<small>³⁺</small>,Eu<small>³⁺</small>, an emerging white-emitting phosphor with good optical properties and thermal-stability, is produced, and the practical calculation methods to calculate the chromaticity-shift (Δ<em>E</em>) and <em>D</em><small>_uv</small> value for color-quality are also demonstrated, making it a good contender for possible use in LEDs. The incorporation of Eu<small>³⁺</small> into Ca<small>₃</small>YAl<small>₃</small>B<small>₄</small>O<small>₁₅</small>:0.015Tm<small>³⁺</small>,0.08Dy<small>³⁺</small> resulted in attractive warm-white light with CCT declining from 4635 K to 3065 K. The Ca<small>₃</small>YAl<small>₃</small>B<small>₄</small>O<small>₁₅</small>:Tm<small>³⁺</small>,Dy<small>³⁺</small>,Eu<small>³⁺</small> exhibited excellent thermal stability (I@400 K = ∼93%). The Ca<small>₃</small>YAl<small>₃</small>B<small>₄</small>O<small>₁₅</small>:Tm<small>³⁺</small>,Dy<small>³⁺</small>,Eu<small>³⁺</small>-based WLED exhibits satisfactory parameters of high <em>R</em><small>_a</small> (89.9) and low-CCT (3065 K). Additionally, this article offers useful mathematical strategies for calculating <em>D</em><small>_uv</small> over a wide-range of chromaticity, from 2000 to 6000 K in CCT and from −0.002 to 0.014, which strongly matches the range in an American National Standards Institute (ANSI) standard. For the first time, white light with minimized thermal-quenching, improved CRI, and color quality has been used in near-UV chip-excited WLEDs.</p>","PeriodicalId":18242,"journal":{"name":"Materials Advances","volume":" 24","pages":" 9851-9861"},"PeriodicalIF":5.2,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ma/d4ma00937a?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142790322","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}

{"title":"Correction: Cu(i) diimine complexes as immobilised antibacterial photosensitisers operating in water under visible light","authors":"Martin V. Appleby, Peter G. Walker, Dylan Pritchard, Sandra van Meurs, Carly M. Booth, Craig Robertson, Michael D. Ward, David J. Kelly and Julia A. Weinstein","doi":"10.1039/D4MA90119C","DOIUrl":"10.1039/D4MA90119C","url":null,"abstract":"<p >Correction for ‘Cu(<small>I</small>) diimine complexes as immobilised antibacterial photosensitisers operating in water under visible light’ by Martin V. Appleby <em>et al.</em>, <em>Mater. Adv.</em>, 2020, <strong>1</strong>, 3417–3427, https://doi.org/10.1039/D0MA00642D.</p>","PeriodicalId":18242,"journal":{"name":"Materials Advances","volume":" 23","pages":" 9501-9501"},"PeriodicalIF":5.2,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11563195/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142648617","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}

{"title":"Microwave-assisted synthesis of copper-loaded polyamidoxime brushes as an efficient catalytic system for nitroarene reduction†","authors":"Shaista Taimur, Shajia Rehman, Mujtaba Ellahi, Syed Rizwan, Humaira Razzaq and Tariq Yasin","doi":"10.1039/D4MA00763H","DOIUrl":"https://doi.org/10.1039/D4MA00763H","url":null,"abstract":"<p >This study reports the development of copper-loaded polyamidoxime polymer brushes (Cu-AO-PB) as a heterogeneous catalyst <em>via</em> microwave-assisted graft polymerization for the first time. Microwave-assisted synthesis allows faster and more uniform heating, leading to shorter reaction times, more energy-efficiency and better control over catalyst morphology reducing production costs and environmental impact. In contrast to the traditional methods, catalysts prepared using microwave techniques often demonstrate superior activity and selectivity due to their unique structural characteristics. The influence of different parameters on the grafting of acrylonitrile onto vinyl sepiolite was studied and a maximum of 449% grafting-percentage was obtained with 89% grafting-efficiency. Polyacrylonitrile grafted brushes were chemically modified to polyamidoxime followed by copper complexation. The surface morphology and chemical composition of the synthesized polymer brushes were assessed by SEM, TEM, XRD, TGA and FTIR. The catalytic capability of Cu-AO-PB was assessed systematically for 4-nitrophenol to 4-aminophenol reduction utilizing a UV-visible spectrophotometer. The Langmuir–Hinshelwood model was exploited to study the mechanism of 4-nitrophenol reduction catalyzed by copper-loaded amidoxime-nanoclay polymer brushes. Thermodynamic studies revealed important insights about Δ<em>G</em>, Δ<em>H</em> and Δ<em>S</em> values. Turnover frequency (TOF) was calculated to be 1.65 × 10<small>¹⁰</small> molecules g<small>⁻¹</small> s<small>⁻¹</small>. Due to the integrated synergy between Cu and the unique polyamidoxime-nanoclay support, Cu-AO-PB demonstrated elevated catalytic efficacy for nitroarene reduction achieving a significantly higher reaction rate (0.0143 s<small>⁻¹</small>) and lower activation energy (28 kJ mol<small>⁻¹</small>) within 360 s.</p>","PeriodicalId":18242,"journal":{"name":"Materials Advances","volume":" 23","pages":" 9428-9444"},"PeriodicalIF":5.2,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ma/d4ma00763h?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142694723","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}