MD ZAHIDUL ISLAM, Hridam Deb, MD Khalid Hasan, Azim Abdullaev, Kun Peng, Shuaida Shi, Yubing Dong, Yaqin Fu
This research investigates the synthesis and evaluation of cyclic olefin copolymer (COC) composites with surface‐engineered boron nitride nanosheets (BNNs) at various concentrations. The study focuses on the impact of Cetyltrimethylammonium bromide (CTAB) on BNNs' surface functionalization to improve their dispersion within the COC matrix, including its dielectric behavior, dielectric breakdown strength, thermal management capabilities, hygroscopic properties, and mechanical robustness. The methodological approach adopted for the fabrication of COC/BNNs hybrid composites commenced with the synthesis of BNNs, surface functionalization of BNNs, in‐situ mixing and hot‐press. This step aimed to enhance compatibility and adhesion between BNNs and the COC matrix, facilitating more homogeneous nanofiller dispersion. The investigative scope of this study encompassed a rigorous evaluation of the resultant composites, with a particular emphasis on their dielectric properties. The dielectric constant (ε') and loss tangent (δ) were measured at a frequency of 10 GHz, revealing an ultra‐low dielectric constant of 1.28, an exceptionally minimal loss tangent of 0.000146, a remarkable 327% (In‐plane) & 129% (axial) increase of thermal conductivity, significant improvement of dielectric breakdown strength up to 88.4 mV/mm, and low water absorptions observed. These results indicate the potential of COC/BNNs composites for high‐frequency electronic packaging applications requiring low dielectric constants.
{"title":"Surface‐Reengineering of BNNs@Hydrocarbon Polymer Composites for Ultra‐Low Dielectric Constant for High‐Frequency Applications","authors":"MD ZAHIDUL ISLAM, Hridam Deb, MD Khalid Hasan, Azim Abdullaev, Kun Peng, Shuaida Shi, Yubing Dong, Yaqin Fu","doi":"10.1002/cnma.202400181","DOIUrl":"https://doi.org/10.1002/cnma.202400181","url":null,"abstract":"This research investigates the synthesis and evaluation of cyclic olefin copolymer (COC) composites with surface‐engineered boron nitride nanosheets (BNNs) at various concentrations. The study focuses on the impact of Cetyltrimethylammonium bromide (CTAB) on BNNs' surface functionalization to improve their dispersion within the COC matrix, including its dielectric behavior, dielectric breakdown strength, thermal management capabilities, hygroscopic properties, and mechanical robustness. The methodological approach adopted for the fabrication of COC/BNNs hybrid composites commenced with the synthesis of BNNs, surface functionalization of BNNs, in‐situ mixing and hot‐press. This step aimed to enhance compatibility and adhesion between BNNs and the COC matrix, facilitating more homogeneous nanofiller dispersion. The investigative scope of this study encompassed a rigorous evaluation of the resultant composites, with a particular emphasis on their dielectric properties. The dielectric constant (ε') and loss tangent (δ) were measured at a frequency of 10 GHz, revealing an ultra‐low dielectric constant of 1.28, an exceptionally minimal loss tangent of 0.000146, a remarkable 327% (In‐plane) & 129% (axial) increase of thermal conductivity, significant improvement of dielectric breakdown strength up to 88.4 mV/mm, and low water absorptions observed. These results indicate the potential of COC/BNNs composites for high‐frequency electronic packaging applications requiring low dielectric constants.","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141738251","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}
Daniely Carlos Henrique, Pollyanna Vanessa dos Santos Lins, Danilo Henrique da Silva Santos, Luiz Daniel da Silva Neto, Jordana Georgin, Dison Stracke Pfingsten Franco, Simoni Margareti Plentz Meneghetti, Lucas Meili
This work aimed to evaluate the synthesis of the ZnAl/layered double hydroxides (LDH) composite with carbon quantum dots (CQD) and its application in water treatment. The synthesis of the ZnAl/LDH@CQD composite was carried out by the co‐precipitation method, being characterized by XRD, FTIR, pHZCP, SEM, EDX, TG, and N2 adsorption/desorption. The results presented a composite with a mesoporous structure, satisfactory values of surface area (18.72 m2 g‐1), and pore size (14.78 nm). Preliminary adsorption tests were carried out, and the composite was efficient in removing some dyes and drugs. The kinetic and equilibrium data for the adsorption study for methylene blue fit best the General Order and Liu models, respectively, with maximum adsorption capacity occurring at 30°C (12.11 mg g‐1). Thermodynamic analysis indicated that the adsorption of MB was exothermic and spontaneous, governed mostly by physical processes. The regeneration of the adsorbent was carried out by oxidation with hydrogen peroxide (250 mmol), showing a 20.93% reduction in the percentage of removal after the first cycle and remaining practically constant until the sixth cycle. These results present an efficient way of using CQD composite as an adsorbent material, with potential application in water purification for human and environmental use.
{"title":"ZnAl/LDH@CQD: Synthesis, Characterization and Use as Adsorbent","authors":"Daniely Carlos Henrique, Pollyanna Vanessa dos Santos Lins, Danilo Henrique da Silva Santos, Luiz Daniel da Silva Neto, Jordana Georgin, Dison Stracke Pfingsten Franco, Simoni Margareti Plentz Meneghetti, Lucas Meili","doi":"10.1002/cnma.202400082","DOIUrl":"https://doi.org/10.1002/cnma.202400082","url":null,"abstract":"This work aimed to evaluate the synthesis of the ZnAl/layered double hydroxides (LDH) composite with carbon quantum dots (CQD) and its application in water treatment. The synthesis of the ZnAl/LDH@CQD composite was carried out by the co‐precipitation method, being characterized by XRD, FTIR, pHZCP, SEM, EDX, TG, and N2 adsorption/desorption. The results presented a composite with a mesoporous structure, satisfactory values of surface area (18.72 m2 g‐1), and pore size (14.78 nm). Preliminary adsorption tests were carried out, and the composite was efficient in removing some dyes and drugs. The kinetic and equilibrium data for the adsorption study for methylene blue fit best the General Order and Liu models, respectively, with maximum adsorption capacity occurring at 30°C (12.11 mg g‐1). Thermodynamic analysis indicated that the adsorption of MB was exothermic and spontaneous, governed mostly by physical processes. The regeneration of the adsorbent was carried out by oxidation with hydrogen peroxide (250 mmol), showing a 20.93% reduction in the percentage of removal after the first cycle and remaining practically constant until the sixth cycle. These results present an efficient way of using CQD composite as an adsorbent material, with potential application in water purification for human and environmental use.","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141738249","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}
Low-toxic multinary semiconductor quantum dots (QDs) showing a photoresponse in a wide range from visible to near-IR have been intensively investigated for fabricating efficient solar light conversion systems. Recently, AgBiS2 QDs have attracted much attention to improve the performance of QD solar cells because they have a large absorption coefficient in visible and near-IR. In this report, we describe the solution-phase preparation of ternary Ag-Bi-S QDs with different sizes and with different Ag/Bi ratios. The average size of resulting spherical Ag-Bi-S QDs was controllable from 2.7 to 8.1 nm by adjusting the reaction temperature from 373 to 473 K, while the Ag fraction of obtained QDs also increased with an increase in the particle size. The absorption onset wavelength shifted from 850 to 1200 nm in the near-IR region as the particle size increased. AgBiS2 QDs with almost the stoichiometric composition, obtained at the reaction temperatures of 423 and 473 K, contained no deep intragap states and exhibited a p-type semiconductor behavior. Sensitized solar cells fabricated with stoichiometric AgBiS2 QDs exhibited a relatively high photoresponse in the visible and near-IR regions, the optimal PCE being 0.74% with AgBiS2 QDs of 6.2 nm in diameter that were prepared at 423 K.
低毒性二元半导体量子点（QDs）可在从可见光到近红外的大范围内产生光响应，已被深入研究用于制造高效的太阳能光转换系统。最近，AgBiS2 QDs 因其在可见光和近红外波段具有较大的吸收系数，在提高 QD 太阳能电池性能方面引起了广泛关注。在本报告中，我们介绍了不同尺寸和不同Ag/Bi比例的三元Ag-Bi-S QDs的溶液相制备方法。通过将反应温度控制在 373 至 473 K 之间，所制备的球形 Ag-Bi-S QDs 的平均粒径可控制在 2.7 至 8.1 nm 之间。随着粒径的增大，吸收起始波长在近红外区域从 850 纳米转移到 1200 纳米。在反应温度为 423 K 和 473 K 时获得的 AgBiS2 QDs 几乎具有化学计量成分，不包含深隙内态，表现出 p 型半导体特性。用化学计量的 AgBiS2 QD 制作的敏化太阳能电池在可见光和近红外区域表现出相对较高的光响应，在 423 K 温度下制备的直径为 6.2 nm 的 AgBiS2 QD 的最佳 PCE 为 0.74%。
{"title":"Tailoring Energy Structure of Low-toxic Ternary Ag–Bi–S Quantum Dots through Solution-phase Synthesis for Quantum-Dot-Sensitized Solar Cells","authors":"Wentao Zhang, Kazutaka Akiyoshi, Tatsuya Kameyama, Tsukasa Torimoto","doi":"10.1002/cnma.202400029","DOIUrl":"https://doi.org/10.1002/cnma.202400029","url":null,"abstract":"Low-toxic multinary semiconductor quantum dots (QDs) showing a photoresponse in a wide range from visible to near-IR have been intensively investigated for fabricating efficient solar light conversion systems. Recently, AgBiS2 QDs have attracted much attention to improve the performance of QD solar cells because they have a large absorption coefficient in visible and near-IR. In this report, we describe the solution-phase preparation of ternary Ag-Bi-S QDs with different sizes and with different Ag/Bi ratios. The average size of resulting spherical Ag-Bi-S QDs was controllable from 2.7 to 8.1 nm by adjusting the reaction temperature from 373 to 473 K, while the Ag fraction of obtained QDs also increased with an increase in the particle size. The absorption onset wavelength shifted from 850 to 1200 nm in the near-IR region as the particle size increased. AgBiS2 QDs with almost the stoichiometric composition, obtained at the reaction temperatures of 423 and 473 K, contained no deep intragap states and exhibited a p-type semiconductor behavior. Sensitized solar cells fabricated with stoichiometric AgBiS2 QDs exhibited a relatively high photoresponse in the visible and near-IR regions, the optimal PCE being 0.74% with AgBiS2 QDs of 6.2 nm in diameter that were prepared at 423 K.","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141719669","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}
Ultrathin zirconium‐based metal–organic framework (MOF) nanosheets, embedded with photochromic units, are expected to be highly efficient heterogeneous photocatalysts, thanks to their rich catalytic sites, short diffusion paths, and effective separation of photogenerated charge carriers. Herein, we reported the synthesis of novel Zr‐MOF nanosheets (Zr‐BTDB) through a solvothermal synthesis that integrates benzothiadiazole (BTz) as a photochromic moiety within the framework of MOF. The Zr‐BTDB nanosheets processes a [Zr12(μ3‐O)8(μ3‐OH)8(μ2‐OH)6] cluster with hcp topology. Importantly, Zr‐BTDB nanosheets exhibit excellent photocatalytic activity for the photooxidation of sulfides and amines at room temperature under blue light irradiation. Notably, these nanosheets maintain their photocatalytic activity and selectivity for up to five cycles without significant loss of activity and crystallinity. Systematical catalytic reactions revealed that the Zr‐BTDB nanosheets enable the generation of singlet oxygen (1O2) and superoxide radical (O2•–) under visible light irradiation, which is critical reactive oxygen species for the photooxidation of sulfides and benzylamines. Our work represents a straightforward route for the preparation of ultrathin, water stable, and visible‐light‐activated Zr‐MOF nanosheets, offering new potentials for the selective photooxidation of sulfides and amines in an eco‐friendly way.
{"title":"Zr‐MOF nanosheets featuring benzothiadiazoles enable efficient visible light driven photooxidation of sulfides and amines","authors":"Yuan-Zhi Tan, Yu-Qing Zhao, Xing-Yu Zhou, Ying-Mei Zhao, Bi-Fu Luo, Hai-Xing Li, Jin-Liang Zhuang","doi":"10.1002/cnma.202400302","DOIUrl":"https://doi.org/10.1002/cnma.202400302","url":null,"abstract":"Ultrathin zirconium‐based metal–organic framework (MOF) nanosheets, embedded with photochromic units, are expected to be highly efficient heterogeneous photocatalysts, thanks to their rich catalytic sites, short diffusion paths, and effective separation of photogenerated charge carriers. Herein, we reported the synthesis of novel Zr‐MOF nanosheets (Zr‐BTDB) through a solvothermal synthesis that integrates benzothiadiazole (BTz) as a photochromic moiety within the framework of MOF. The Zr‐BTDB nanosheets processes a [Zr12(μ3‐O)8(μ3‐OH)8(μ2‐OH)6] cluster with hcp topology. Importantly, Zr‐BTDB nanosheets exhibit excellent photocatalytic activity for the photooxidation of sulfides and amines at room temperature under blue light irradiation. Notably, these nanosheets maintain their photocatalytic activity and selectivity for up to five cycles without significant loss of activity and crystallinity. Systematical catalytic reactions revealed that the Zr‐BTDB nanosheets enable the generation of singlet oxygen (1O2) and superoxide radical (O2•–) under visible light irradiation, which is critical reactive oxygen species for the photooxidation of sulfides and benzylamines. Our work represents a straightforward route for the preparation of ultrathin, water stable, and visible‐light‐activated Zr‐MOF nanosheets, offering new potentials for the selective photooxidation of sulfides and amines in an eco‐friendly way.","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141640669","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}
Delong Yang, Ziting Du, Jinhang Dai, Qingya Cao, Zhaobao Xiang, Gang Chen, Fukun Li
Here, a series of nitrogen‐doped carbon (NC) supported transition metal oxide catalysts were prepared by pyrolysis of chitosan‐metal salt mixtures for the efficient synthesis 2,5‐diformylfuran (DFF) from 5‐hydroxymethylfurfural (HMF) and fructose. Among them, supported molybdenum‐based species on nitrogen‐doped carbon (Mo/NC) exhibited excellent activity and selectivity for selective oxidation of HMF to DFF. The presence of nitrogen species reduces the electron cloud density around the Mo species, thereby improving the catalytic activity. Moreover, the interaction between active MoO2 species on the catalyst surface and NC ensured the stability of the catalyst, resulting in no significant loss of activity after four catalytic cycles. 99.5% and 55.1% yields of DFF with full conversion were obtained from HMF and fructose respectively over Mo/NC‐chitosan‐600 in DMSO under ambient air. In order to enhance DFF yield from fructose, sulfonate groups were introduced into Mo/NC‐chitosan‐600 catalyst, leading to the highest DFF yield of 70.2%. In addition, this catalyst also allowed 10.0%, 22.9% and 33.3% DFF yields from glucose, sucrose and inulin, respectively.
{"title":"Conversion of 5‐hydroxymethylfurfural and carbohydrates to 2,5‐diformylfuran over supported Mo‐based catalysts","authors":"Delong Yang, Ziting Du, Jinhang Dai, Qingya Cao, Zhaobao Xiang, Gang Chen, Fukun Li","doi":"10.1002/cnma.202400351","DOIUrl":"https://doi.org/10.1002/cnma.202400351","url":null,"abstract":"Here, a series of nitrogen‐doped carbon (NC) supported transition metal oxide catalysts were prepared by pyrolysis of chitosan‐metal salt mixtures for the efficient synthesis 2,5‐diformylfuran (DFF) from 5‐hydroxymethylfurfural (HMF) and fructose. Among them, supported molybdenum‐based species on nitrogen‐doped carbon (Mo/NC) exhibited excellent activity and selectivity for selective oxidation of HMF to DFF. The presence of nitrogen species reduces the electron cloud density around the Mo species, thereby improving the catalytic activity. Moreover, the interaction between active MoO2 species on the catalyst surface and NC ensured the stability of the catalyst, resulting in no significant loss of activity after four catalytic cycles. 99.5% and 55.1% yields of DFF with full conversion were obtained from HMF and fructose respectively over Mo/NC‐chitosan‐600 in DMSO under ambient air. In order to enhance DFF yield from fructose, sulfonate groups were introduced into Mo/NC‐chitosan‐600 catalyst, leading to the highest DFF yield of 70.2%. In addition, this catalyst also allowed 10.0%, 22.9% and 33.3% DFF yields from glucose, sucrose and inulin, respectively.","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141646981","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}
liya ye, aihong wu, Liqiang Liu, Hua Kuang, Chuanlai Xu, Xinxin Xu
Four inflammatory biomarkers (CRP, IL‐6, PCT and SAA) have different manifestations and roles in different infectious diseases and stages of infection, and the diagnosis and identification of infectious diseases can be realized through quantitative analysis of these four biomarkers simultaneously. In this study, we developed a colloidal gold nanoparticle (AuNP)‐based multiplex LFA strip using eight highly‐sensitive monoclonal antibodies that simultaneously detected CRP, IL‐6, PCT and SAA in serum within 15 min. And quantitative analysis was achieved with a portable strip reader, the LODs were 2.5 μg/mL, 25.3 pg/mL 0.87 ng/mL and 8.8 μg/mL for CRP, IL‐6, PCT and SAA, while detection ranges were 2.5–200 μg/mL, 25.3–8000 pg/mL 0.87–100 ng/mL and 8.8–200 μg/mL. Moreover, the quantitative colloidal gold assay correlated well with the results of a chemiluminescence immunoassay when testing clinical serum samples. Our developed method was reliable and accurate according to the recovery test results. Therefore, the strip can be used as an alternative method for the simultaneous monitoring of CRP, IL‐6, PCT and SAA in serum samples.
{"title":"Quantitative and ultrasensitive detection of four inflammatory biomarkers by gold nanoparticle‐based paper sensor","authors":"liya ye, aihong wu, Liqiang Liu, Hua Kuang, Chuanlai Xu, Xinxin Xu","doi":"10.1002/cnma.202400118","DOIUrl":"https://doi.org/10.1002/cnma.202400118","url":null,"abstract":"Four inflammatory biomarkers (CRP, IL‐6, PCT and SAA) have different manifestations and roles in different infectious diseases and stages of infection, and the diagnosis and identification of infectious diseases can be realized through quantitative analysis of these four biomarkers simultaneously. In this study, we developed a colloidal gold nanoparticle (AuNP)‐based multiplex LFA strip using eight highly‐sensitive monoclonal antibodies that simultaneously detected CRP, IL‐6, PCT and SAA in serum within 15 min. And quantitative analysis was achieved with a portable strip reader, the LODs were 2.5 μg/mL, 25.3 pg/mL 0.87 ng/mL and 8.8 μg/mL for CRP, IL‐6, PCT and SAA, while detection ranges were 2.5–200 μg/mL, 25.3–8000 pg/mL 0.87–100 ng/mL and 8.8–200 μg/mL. Moreover, the quantitative colloidal gold assay correlated well with the results of a chemiluminescence immunoassay when testing clinical serum samples. Our developed method was reliable and accurate according to the recovery test results. Therefore, the strip can be used as an alternative method for the simultaneous monitoring of CRP, IL‐6, PCT and SAA in serum samples.","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141647233","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}
Metal chelation, characterized by its precise interactions with diverse functional groups, assumes a pivotal role in providing structural stability and generating reactive centers within metalloproteins and metallopeptides. This, in turn, orchestrates the architecture and functionality of various biological processes in living organisms. In our biomimetic approach inspired by the intricacies of natural metallopeptides, we have purposefully designed pyridine‐bis‐tyrosine, a concise Metallopeptide Conjugate (sMPC). Demonstrating the capacity to form complexes with various bioactive metal ions, sMPC emerges as a promising tool for advancing our understanding of metal‐binding proteins and catalyzing the development of cutting‐edge biotechnological materials and technologies. Our investigations underscore the hierarchical self‐assembly of these abridged conjugates into toroidal to vesicle nanostructures, influenced by concentration, and their susceptibility to spatial manipulation through metal ion coordination with functional groups. These biocompatible metal peptide complexes and their resultant nanomaterials present specific potential as exceptional therapeutic agents to address problems associated with metal ion deficiencies, offering a facile and low‐cost alternative to traditional metallodrugs.
{"title":"Self‐Assembled Bioinspired Short Metallopeptide Nanostructures for Plausible Biomedical Applications","authors":"K. Joshi, Shruti Sharma, Aanand Kautu, Nikunj Kumar, Narayan Swain, Vikas Kumar, Ramesh Singh, Khushboo Kesharwani, Narendra Singh, Puneet Gupta","doi":"10.1002/cnma.202400098","DOIUrl":"https://doi.org/10.1002/cnma.202400098","url":null,"abstract":"Metal chelation, characterized by its precise interactions with diverse functional groups, assumes a pivotal role in providing structural stability and generating reactive centers within metalloproteins and metallopeptides. This, in turn, orchestrates the architecture and functionality of various biological processes in living organisms. In our biomimetic approach inspired by the intricacies of natural metallopeptides, we have purposefully designed pyridine‐bis‐tyrosine, a concise Metallopeptide Conjugate (sMPC). Demonstrating the capacity to form complexes with various bioactive metal ions, sMPC emerges as a promising tool for advancing our understanding of metal‐binding proteins and catalyzing the development of cutting‐edge biotechnological materials and technologies. Our investigations underscore the hierarchical self‐assembly of these abridged conjugates into toroidal to vesicle nanostructures, influenced by concentration, and their susceptibility to spatial manipulation through metal ion coordination with functional groups. These biocompatible metal peptide complexes and their resultant nanomaterials present specific potential as exceptional therapeutic agents to address problems associated with metal ion deficiencies, offering a facile and low‐cost alternative to traditional metallodrugs.","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141649552","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}
Electrochemical hydrogen and acetate cogeneration from ethanol is a promising green hydrogen production technique with low hydrogen production energy consumption and high profitability. However, the poor catalytic stability of the anodic ethanol electro‐oxidation reaction (EOR) retards the device application. We adopted a metal support interaction strategy to reinforce small‐sized Au active sites using cuprous sulfide supports. The Au‐Cu2‐xS/C showed a superior activity of 1055 mA mgAu‐1 at 1.1 V vs. RHE and retained the high activity in the chronopotentiometric test, surpassing the Au/C catalyst. It was demonstrated that the Cu2‐xS support facilitated the formation of Au‐OH and prevented the gold sites from aggregation, leading to high activity and stability for EOR. Finally, an electrochemical cogeneration electrolyzer assembled with the Au‐Cu2‐xS/C anodic catalyst continuously ran for over 100 hours, suggesting the device's applicability.
{"title":"Metal‐Support Interaction Boosts Au Catalysts for Hydrogen Evolution‐Coupled Ethanol Electro‐Oxidation Reaction","authors":"Yiquan Yin, Fangwei Gu, Yuxin Wang, Chengjin Chen, Yongsheng Wang, Wei Zhu, Zhongbin Zhuang","doi":"10.1002/cnma.202400267","DOIUrl":"https://doi.org/10.1002/cnma.202400267","url":null,"abstract":"Electrochemical hydrogen and acetate cogeneration from ethanol is a promising green hydrogen production technique with low hydrogen production energy consumption and high profitability. However, the poor catalytic stability of the anodic ethanol electro‐oxidation reaction (EOR) retards the device application. We adopted a metal support interaction strategy to reinforce small‐sized Au active sites using cuprous sulfide supports. The Au‐Cu2‐xS/C showed a superior activity of 1055 mA mgAu‐1 at 1.1 V vs. RHE and retained the high activity in the chronopotentiometric test, surpassing the Au/C catalyst. It was demonstrated that the Cu2‐xS support facilitated the formation of Au‐OH and prevented the gold sites from aggregation, leading to high activity and stability for EOR. Finally, an electrochemical cogeneration electrolyzer assembled with the Au‐Cu2‐xS/C anodic catalyst continuously ran for over 100 hours, suggesting the device's applicability.","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141613543","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}
Silver selenide (Ag2Se) is a promising thermoelectric material for near‐room temperature applications. This study proposes a fast, simple, and cost‐effective method for producing high thermoelectric performance bulk Ag2Se. Ag2Se powders were synthesized from Ag and Se powders via a one‐hour wet ball milling process, followed by the fabrication of bulk pellets through low‐temperature hot‐pressing (130‐250 °C) with a mere 0.5‐hour holding time. Both Ag2Se powders and bulk pellets exhibited a single phase of orthorhombic β‐Ag2Se phase, with uniform compositional distribution Microstructural analysis revealed distinct grain boundaries in samples hot‐pressed below 190 °C, transitioning to grain coalescence was at 190 °C and 250 °C. The thermoelectric and transport measurements demonstrated that the electrical conductivity decreased and the Seebeck coefficient increased with hot‐pressing temperatures from 130 °C and 190 °C primarily due to reduced carrier concentrations. Thermal conductivity decreased with increasing hot‐pressing temperatures up to 190 °C, attributed to the weak chemical bonding of Ag2Se and the presence of defects. This resulted in a peak zT over 1.0 at 300 K, with an average zT close to 1.0 from 300 to 380 K. Despite lower temperatures and shorter processing times, the method produces Ag2Se with zT values comparable to more intricate techniques.
{"title":"Fast, Simple, and Cost‐Effective Fabrication of High‐Performance Thermoelectric Ag2Se through Low‐Temperature Hot‐Pressing","authors":"Jariya Lasiw, Teerasak Kamwanna, Supree Pinitsoontorn","doi":"10.1002/cnma.202400319","DOIUrl":"https://doi.org/10.1002/cnma.202400319","url":null,"abstract":"Silver selenide (Ag2Se) is a promising thermoelectric material for near‐room temperature applications. This study proposes a fast, simple, and cost‐effective method for producing high thermoelectric performance bulk Ag2Se. Ag2Se powders were synthesized from Ag and Se powders via a one‐hour wet ball milling process, followed by the fabrication of bulk pellets through low‐temperature hot‐pressing (130‐250 °C) with a mere 0.5‐hour holding time. Both Ag2Se powders and bulk pellets exhibited a single phase of orthorhombic β‐Ag2Se phase, with uniform compositional distribution Microstructural analysis revealed distinct grain boundaries in samples hot‐pressed below 190 °C, transitioning to grain coalescence was at 190 °C and 250 °C. The thermoelectric and transport measurements demonstrated that the electrical conductivity decreased and the Seebeck coefficient increased with hot‐pressing temperatures from 130 °C and 190 °C primarily due to reduced carrier concentrations. Thermal conductivity decreased with increasing hot‐pressing temperatures up to 190 °C, attributed to the weak chemical bonding of Ag2Se and the presence of defects. This resulted in a peak zT over 1.0 at 300 K, with an average zT close to 1.0 from 300 to 380 K. Despite lower temperatures and shorter processing times, the method produces Ag2Se with zT values comparable to more intricate techniques.","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141613542","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}
Ruijie Han, Qi Yue, Yingjie Cao, Duo Wei, Xiaolin Liu, Jia Lin
With the growing demand for high‐performance smart windows, the discover of a class of thermochromic materials with reversible cycling and rapid response characteristics has become urgent. In this work, we have uncovered a two‐dimensional (2D) Ruddlesden‐Popper (RP) phase halide perovskite, (PMA)2MAPb2I7−xClx, where PMA = C6H5CH2NH3 and MA = CH3NH3, exhibiting exceptional reversible thermochromic properties. The 2D RP phase perovskite thin film features a low transition temperature of 30 °C from the hydrated state to the hot state, along with a fast transition time of 40 s. Furthermore, the addition of 0.5 times excess MAI significantly enhances the visible light transmittance of the hydrated state. Characteristic hydration peaks in X‐ray diffraction patterns and O‐H bond absorption peaks in Fourier‐transform infrared spectra are observed in the thin film in its hydrated state, which disappear in the hot state, validating its reversible thermochromic properties. Additionally, a solar cell based on the thermochromic 2D RP phase thin film achieves a power conversion efficiency of 2.31%, offering a promising solution for advanced smart window technologies.
随着人们对高性能智能窗户的需求日益增长，发现一类具有可逆循环和快速响应特性的热致变色材料已成为当务之急。在这项工作中，我们发现了一种二维（2D）Ruddlesden-Popper（RP）相卤化物包晶体--(PMA)2MAPb2I7-xClx，其中 PMA = C6H5CH2NH3，MA = CH3NH3，表现出优异的可逆热致变色特性。这种二维 RP 相包晶石薄膜从水合态到热态的转变温度低至 30 °C，转变时间短至 40 秒。此外，添加 0.5 倍过量的 MAI 能显著提高水合态的可见光透射率。在水合态薄膜的 X 射线衍射图谱中可以观察到特征性的水合峰，在傅立叶变换红外光谱中可以观察到 O-H 键吸收峰，这些峰在热态时消失，从而验证了其可逆热致变色特性。此外，基于热致变色二维 RP 相薄膜的太阳能电池实现了 2.31% 的功率转换效率，为先进的智能窗户技术提供了一种前景广阔的解决方案。
{"title":"Highly Sensitive Two‐Dimensional Ruddlesden‐Popper Perovskites for Thermochromic Smart Windows","authors":"Ruijie Han, Qi Yue, Yingjie Cao, Duo Wei, Xiaolin Liu, Jia Lin","doi":"10.1002/cnma.202400306","DOIUrl":"https://doi.org/10.1002/cnma.202400306","url":null,"abstract":"With the growing demand for high‐performance smart windows, the discover of a class of thermochromic materials with reversible cycling and rapid response characteristics has become urgent. In this work, we have uncovered a two‐dimensional (2D) Ruddlesden‐Popper (RP) phase halide perovskite, (PMA)2MAPb2I7−xClx, where PMA = C6H5CH2NH3 and MA = CH3NH3, exhibiting exceptional reversible thermochromic properties. The 2D RP phase perovskite thin film features a low transition temperature of 30 °C from the hydrated state to the hot state, along with a fast transition time of 40 s. Furthermore, the addition of 0.5 times excess MAI significantly enhances the visible light transmittance of the hydrated state. Characteristic hydration peaks in X‐ray diffraction patterns and O‐H bond absorption peaks in Fourier‐transform infrared spectra are observed in the thin film in its hydrated state, which disappear in the hot state, validating its reversible thermochromic properties. Additionally, a solar cell based on the thermochromic 2D RP phase thin film achieves a power conversion efficiency of 2.31%, offering a promising solution for advanced smart window technologies.","PeriodicalId":54339,"journal":{"name":"ChemNanoMat","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141613545","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：