ChemNanoMat最新文献

{"title":"Front Cover: Inorganic-Organic Hybrid Crystals Derived from Polyoxovanadate and Ionic-Liquid toward Promising Conductive Materials (ChemNanoMat 8/2024)","authors":"Yoshiki Kiyota,&nbsp;Seiji Ono,&nbsp;Dr. Kaito Sasaki,&nbsp;Nanako Tamai,&nbsp;Hironori Sugimoto,&nbsp;Prof. Dr. Yosuke Okamura,&nbsp;Prof. Dr. Shinichi Koguchi,&nbsp;Prof. Dr. Masashi Higuchi,&nbsp;Prof. Dr. Yu Nagase,&nbsp;Prof. Dr. Naoki Shinyashiki,&nbsp;Prof. Dr. Sayaka Uchida,&nbsp;Prof. Dr. Takeru Ito","doi":"10.1002/cnma.202480801","DOIUrl":"10.1002/cnma.202480801","url":null,"abstract":"<p>Highly conductive inorganic-organic hybrid crystals were constructed by using polyoxovanadate cluster and ionic-liquid cation. Two types of hybrid crystals containing alkaline earth metal (divalent) cations were obtained. Conductivities under a humidified condition reached 3.3×10^–3 S cm^–1 at 353 K (80 °C). More information can be found in the Research Article by Takeru Ito and co-workers.<figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure>\u0000 </p>","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":"10 8","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cnma.202480801","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141929843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"RuO2/Cysteine Nanocomposites for High-Performance Supercapacitors","authors":"Rui Zhang,&nbsp;Dr. Yan Guo,&nbsp;Xiaoyu Zhu,&nbsp;Maoyan Dou,&nbsp;Dr. Tao Tao,&nbsp;Dr. Hui He,&nbsp;Ziqin Gong","doi":"10.1002/cnma.202400283","DOIUrl":"10.1002/cnma.202400283","url":null,"abstract":"<p>RuO₂/Cysteine (RuO₂/Cys) nanocomposites were synthesized using a facile high-temperature hydrothermal method, with improved specific capacitance and good electrochemical durability. The advantage of using cysteine is that its molecule is rich in ligands such as carboxyl, sulfhydryl, and amino groups, which can be easily bound to hydrated RuO₂, thus facilitating its effective dispersion. Analyses of its morphology, structure, and chemical composition showed that the incorporation of L-cysteine greatly inhibited the agglomeration of RuO₂ and improved its dispersion, and the scale of RuO₂ was reduced from the original micrometer scale to the nanometer scale. Such structures facilitated proton transfer and electron transfer, so RuO₂/Cys nanocomposites showed significantly improved specific capacitance, up to 1221.7 F g⁻¹, and the energy density was up to 108.6 Wh kg⁻¹ with a power density of 400.2 W kg⁻¹ at 1 A g⁻¹ in a 0.5 M H₂SO₄ electrolyte. The combination of L-cysteine with RuO₂ also effectively prevented the deformation of RuO₂ in the redox process, and the capacitance retention rate was increased to 87.7% compared to 48.8% of pristine RuO₂ after 10,000 charging-discharging cycles. High capacitance performance and improved cyclic stability enable RuO₂/Cys nanocomposite to be a favorable electrode material for wide applications in energy storage.</p>","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":"10 11","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141929844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Surface Defects, Ni3+ Species, Charge Transfer Resistance, and Surface Area Dictate the Oxygen Evolution Reaction Activity of Mesoporous NiCo2O4 Thin Films","authors":"Erik Dubai,&nbsp;Qingyang Wu,&nbsp;Stefan Lauterbach,&nbsp;Jan P. Hofmann,&nbsp;Marcus Einert","doi":"10.1002/cnma.202400242","DOIUrl":"10.1002/cnma.202400242","url":null,"abstract":"<p>For catalyzing the oxygen evolution reaction, earth-abundant materials with high activity and stability need to be developed. NiCo₂O₄ has been proven to show high OER activity, however facile and inexpensive techniques for preparation of this compound as mesostructured thin film, possessing a high surface area, is lacking. In this study, the sol-gel synthesis of nanocrystalline, mesoporous spinel NiCo₂O₄ thin films by dip-coating and soft-templating using the evaporation-induced self-assembly approach and utilizing the tri-block-copolymer Pluronic® F-127 as structure-directing agent is reported. The morphology and crystallographic structure were thoroughly probed by various physicochemical characterization techniques collectively validating the development of uniform mesoporous NiCo₂O₄ architectures crystallizing exclusively in the cubic spinel phase after calcination in air at ether 300 °C, 400 °C, or 500 °C. The surface area of thin films increased from 300 °C to 400 °C owing to degradation of the organic template, while the growth of the mesopores from 400 °C to 500 °C resulted in significant decline of the overall (electrochemical) surface area. XPS investigations showed that the amount of octahedrally coordinated Ni³⁺ and defective (low-coordinated) oxygen species increased for decreasing calcination temperatures. The nanomorphology and presence of catalytically active surface sites of the mesoporous NiCo₂O₄ electrodes were correlated with the electrochemical properties, presenting that the overall surface area, Ni³⁺ content, charge transfer resistance, and amount of defective oxygen sites collectively control the OER performance. After an optimized annealing procedure at 300 °C and chronopotentiometric analysis at 10 mA/cm² for 1.5 h, a low overpotential of 330 mV vs. RHE at 10 mA/cm² in alkaline solution was achieved. The results highlight the necessity of precise selection of the appropriate calcination temperature and tailoring of the nanostructure and electrochemical pre-treatment conditions of NiCo₂O₄ sol-gel thin films for adjusting the concentration of electrocatalytically active reaction sites.</p>","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":"10 11","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cnma.202400242","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141929845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"First Example of Single-Crystal Nanodiamonds Immobilized in Porous SiO2-Aerogel Matrix: Synthesis and Characterization","authors":"Irina G. Fomina,&nbsp;Inna O. Gozhikova,&nbsp;Nataliya A. Sipyagina,&nbsp;Elena A. Straumal,&nbsp;Gennady P. Kopitsa,&nbsp;Andrey A. Mazilkin,&nbsp;Andrei A. Eliseev,&nbsp;Nikolay N. Efimov,&nbsp;Yury S. Zavorotny,&nbsp;Alexander V. Shvidchenko,&nbsp;Alexander Y. Vul',&nbsp;Igor L. Eremenko,&nbsp;Sergey A. Lermontov","doi":"10.1002/cnma.202400172","DOIUrl":"10.1002/cnma.202400172","url":null,"abstract":"<p>A first composite material containing uniformly dispersed disaggregated detonation nanocrystalline diamonds (DNDs) in SiO₂ aerogel matrix was prepared. The synthetic protocol included hydrolysis of tetramethyl orthosilicate (Si(OMe)₄, TMOS) by hydrosol of surface carboxylated DNDs with a typical size of 4–5 nm with DMSO serving as a cosolvent and a stabilizer of DND single crystals. Composite samples containing DNDs in silica aerogel matrix in concentration 1.0, 0.1 and 0.01 % w/w were prepared at ambient temperature. HRTEM data revealed that DNDs nanocrystals were uniformly distributed in aerogel and did not form aggregates. Textural and optical composites’ properties were determined.</p>","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":"10 11","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141929846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structural Stability of Mixed-Halide Perovskite Nanocrystals in Energy Storage: The Role of Iodine Expulsion","authors":"Arun Kumar,&nbsp;Atif Suhail,&nbsp;Prem Sagar Shukla,&nbsp;Monojit Bag","doi":"10.1002/cnma.202400401","DOIUrl":"10.1002/cnma.202400401","url":null,"abstract":"<p>In the pursuit of efficient optoelectronics devices, hybrid lead halide perovskite quantum dots (PQDs) have emerged as highly promising semiconductor materials due to their intriguing properties. While these materials have been used in many applications, the fundamental understanding of their behavior remains relatively unexplored, especially for the mixed halide perovskite samples. To facilitate the advancement of PQD technologies for commercial applications, it is essential to gain insights into the role of ion migration. This study delves into the fundamental aspects of ion migration in halide perovskite nanocrystals. Porous electrodes for supercapacitor application were fabricated using CsPbBr_3–xI_x (x=0,1,2) nanocrystals prepared via the ligand-assisted re-precipitation (LARP) method. Three-electrode electrochemical measurements and several other characterizations were conducted under dark conditions to evaluate device performance and elucidate the impact of mixed halides on device kinetics and stability. X-ray photoelectron spectroscopy before and after the electrochemical measurement reveals intriguing findings. Notably, the analysis uncovered the phase segregation in the metal halide perovskite nanocrystals with particular emphasis on CsPbBr₂I due to its distinctive mixed-halide behavior. The specific capacitance increases with the increasing cycles. Interestingly, as the iodide content increases, there is no selective halide expulsion as the structure collapses rapidly.</p>","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":"10 11","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141884556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Filamentous Aerogels for Electromagnetic Shielding","authors":"Zahra Rezaei,&nbsp;Prof. Elisabeth Prince,&nbsp;Prof. Milad Kamkar","doi":"10.1002/cnma.202400113","DOIUrl":"10.1002/cnma.202400113","url":null,"abstract":"<p>The unrelenting expansion of electronics and wireless communications has brought an onslaught of electromagnetic interference and environmental radiation as a new form of pollution. Filamentous aerogels offer a viable solution to this growing challenge: with their hierarchical inter- and intra-filament porosities, they have recently shown great promise as EMI shielding materials. The multidirectional EM wave scattering within their hierarchical porous structure enhances attenuation much higher than conventional monolithic aerogels. This concept paper summarizes recent groundbreaking efforts in filamentous aerogel fabrication, with a focus on liquid streaming and 3D printing approaches. Further research and development could see filamentous aerogels emerge as next-generation materials to combat the intensification of electromagnetic environmental impacts.</p>","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":"10 9","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cnma.202400113","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141884554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"An Ultra-Sensitive Electrochemical Sensor for Nitrite Based on Green Synthesized Gold Nanoparticles Using Colocasia Esculenta Extract","authors":"Protity Saha,&nbsp;Md. Abdul Aziz,&nbsp;Md. Mominul Islam,&nbsp;A. J. Saleh Ahammad","doi":"10.1002/cnma.202400325","DOIUrl":"10.1002/cnma.202400325","url":null,"abstract":"<p>Seeking to establish a novel, eco-friendly and ultra- sensitive electrochemical nitrite sensor, we have fabricated fluorine doped tin oxide (FTO) electrode with green synthesized gold nanoparticles (AuNPs) from gold salt and taro plant (<i>Colocasia esculenta</i>) extract (Taro_AuNPs/FTO). Different morphological and elemental analysis were conducted to undermine morphological condition and shapes of AuNPs. Further, electrochemical studies were performed for enabling observation on the modification as well as interaction between nitrite ion and AuNPs on the modified FTO. Furthermore, the performance of Taro_AuNPs/FTO sensor was evaluated using DPV technique and the limit of detection (LOD) was 0.923 nmol L⁻¹ (S/N=3) having sensitivity of 0.00503 μA mM⁻¹ cm⁻² within 5–500 μmol L⁻¹. Additionally, an insightful mechanistic overview was highlighted about interacting nitrite on the modified electrode surface. Finally, interference test, stability, reproducibility and real sample analysis were conducted to establish the effectiveness of Taro_AuNPs/FTO electrochemical senor for environmental application.</p>","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":"10 11","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141884558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancing Crystallinity and Magnetic Properties of Cobalt Ferrite Nanoparticles via Thermal Oxidation","authors":"Kingsley Poon,&nbsp;Dr. Gurvinder Singh","doi":"10.1002/cnma.202400168","DOIUrl":"10.1002/cnma.202400168","url":null,"abstract":"<p>Cobalt ferrite (CFO) nanoparticles (NPs) are highly promising for data storage, energy conversion, permanent magnets, and biomedical applications owing to their exceptional magnetic properties. However, the presence of phase impurities (particularly FeO and CoO) can severely degrade their magnetic properties, hindering their practical use. Here, we present a simple post-synthesis oxidation approach to address this challenge. Our method involves the thermal decomposition of Fe−Co oleate followed by oxidation using trimethylamine N-oxide. The results reveal the effective elimination of FeO and CoO impurities and the formation of spinel ferrite crystal structures post-oxidation with no change in morphology or size. Magnetic measurements demonstrate a significant enhancement in magnetic properties (<i>e. g</i>., magnetic saturation, coercivity, and blocking temperature) in oxidized CFO NPs compared to the non-oxidized counterparts, indicative of the recovered ferrimagnetic structure upon post-synthesis oxidation. As expected, the restoration of the ferrimagnetic structure, resulting in improved magnetic anisotropy, led to decreased SAR values as the nanoparticles moved away from the optimal anisotropy range. The study underscores the necessity of post-synthesis oxidation for ensuring phase purity and enhancing the magnetic properties of CFO NPs, irrespective of the synthesis method. This approach offers a promising route for producing highly functional magnetic nanoparticles for practical applications.</p>","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":"10 11","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cnma.202400168","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141867872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Insights into Mechanisms of Reverse Water Gas Shift Activity Enhancement over Reverse Microemulsion-Synthesized CuCeO2","authors":"Kishore Kandasamy,&nbsp;Yue Yu,&nbsp;Muhammad Waqas Iqbal,&nbsp;Luis Ricardez-Sandoval,&nbsp;Aiping Yu,&nbsp;David S. A. Simakov","doi":"10.1002/cnma.202400128","DOIUrl":"10.1002/cnma.202400128","url":null,"abstract":"<p>Copper-doped ceria (CuCeO₂) catalysts with 0–26.5 Cu/(Cu+Ce) at% were synthesized via the reverse microemulsion method. X-ray diffraction analysis of freshly synthesized and spent (post-reaction) catalysts showed no separate phase of copper or copper oxide, indicating that Cu was incorporated into the CeO₂ lattice, replacing Ce. Temperature programmed desorption experiments showed that the activation energy of CO₂ desorption increased for higher Cu loadings, indicating stronger CO₂ adsorption. This phenomenon was attributed to enhanced formation of oxygen vacancies due to Cu doping. X-ray photoelectron spectroscopy further confirmed the enhanced generation of oxygen vacancies due to Cu incorporation. Catalytic performance evaluation with the H₂/CO₂ feed in the 300–600 °C range showed that all catalysts were 100 % selective to CO generation, with higher Cu loadings resulting in CO₂ conversion close to equilibrium values at 500–600 °C. The activation energy of the reaction, determined through reaction tests, exhibited inverse relationship with the activation energy of CO₂ desorption. The relationship between these two energy barriers is explored, providing valuable insights into the mechanism of RWGS activity enhancement.</p>","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":"10 11","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/cnma.202400128","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141867871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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":"Optimisation and Characterisation of Improved Nanoemulsion Formulations Containing Ceramide 3","authors":"Fan Xu,&nbsp;Yuxin Liu,&nbsp;Jun Zhu,&nbsp;Xin Zhan,&nbsp;Yinmao Dong,&nbsp;Hong Meng,&nbsp;Shujing Li,&nbsp;Yifan He,&nbsp;Ze Zhang","doi":"10.1002/cnma.202400289","DOIUrl":"10.1002/cnma.202400289","url":null,"abstract":"<p>Ceramide3 (Cer3) is one of the important components of stratum corneum (SC) lipids with good moisturizing and repairing properties. However, it suffers from (a) poor solubility, (b) easy crystallization and precipitation, and (c) strong polarity and difficulty in transdermal application. This study aimed to load Cer3 into nanoemulsions (NEs) to overcome these mentioned defects. The optimized NEs formulation was prepared by high pressure homogenization method and characterized by several methods. The optimized ceramide3 nanoemulsions (Cer3-NEs) exhibited a good physico-chemical stability over 3 months under different conditions, with droplet size of 103.1 nm, PDI of 0.178, zeta potential of −39.09 mV, pH of 6.20 and encapsulation efficiency of 96.39 %. Turbiscan results showed that formulations containing Cer3-NEs have better stability than those containing free Cer3. The dermal delivery ability of Cer3-NEs was assessed by Franz diffusion and confocal Raman spectroscopy (CRM). In vitro and in vivo penetration studies showed that Cer3-NEs serum have almost 2–3 times higher retention in the skin and permeation in the receptor solution compared to serum with free Cer3. The findings show NE is a promising carrier of Cer3 for topical administration in the treatment of dryness and barrier damage due to higher stability and better skin permeability.</p>","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":"10 11","pages":""},"PeriodicalIF":2.6,"publicationDate":"2024-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141867915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}