Pub Date : 2023-01-31DOI: 10.1088/2399-1984/acb7b7
Nomfundo Ruth Lushaba, S. Parani, Rodney Maluleke, Gracia it Mwad Mbaz, O. Oluwafemi
Photocatalytic degradation has been demonstrated to be an efficient and eco-friendly method for the removal of dye pollutants. Herein, we report the synergetic effect of glutathione (GSH)-capped AgInS2-ZnS (AIS-ZnS) core–shell quantum dots (QDs) and titanium dioxide (TiO2) as a novel nanocomposite for the efficient photocatalytic treatment of methylene blue (MB). The AIS-ZnS core–shell QDs and the corresponding QD/TiO2 nanocomposites were synthesized directly in an aqueous medium followed by annealing. The optical properties of the AIS-ZnS core–shell QDs showed strong yellow photoluminescence, which decreased gradually with the addition of TiO2. Fourier transform infrared (FTIR) spectroscopy confirmed the GSH capping on the QDs and nanocomposites. X-ray diffraction and transmission electron microscopy revealed the nanocrystalline nature and shape of the as-synthesized materials and showed the integration of the QDs (3.9 nm) on the TiO2 particles after annealing. These materials were then investigated as a photocatalyst for MB degradation using visible light irradiation. The effect of TiO2 content in the catalyst, calcination, photoirradiation period, catalyst dose, and initial MB concentration on photodegradation of MB was studied. The results indicated that the AIS-ZnS QD/TiO2 nanocomposite exhibited better photodegradation performance compared to AIS-ZnS QDs and TiO2. The increasing TiO2 concentration in the nanocomposite also enhanced MB degradation efficiency (up to 99%). The kinetics of MB degradation follows a pseudo-first-order process. The prepared AIS-ZnS QD/TiO2 nanocomposite would serve as an effective and eco-friendly photocatalyst for MB degradation.
{"title":"Synthesis of AgInS2-ZnS quantum dot/TiO2 nanocomposites as efficient photocatalysts for methylene blue degradation","authors":"Nomfundo Ruth Lushaba, S. Parani, Rodney Maluleke, Gracia it Mwad Mbaz, O. Oluwafemi","doi":"10.1088/2399-1984/acb7b7","DOIUrl":"https://doi.org/10.1088/2399-1984/acb7b7","url":null,"abstract":"Photocatalytic degradation has been demonstrated to be an efficient and eco-friendly method for the removal of dye pollutants. Herein, we report the synergetic effect of glutathione (GSH)-capped AgInS2-ZnS (AIS-ZnS) core–shell quantum dots (QDs) and titanium dioxide (TiO2) as a novel nanocomposite for the efficient photocatalytic treatment of methylene blue (MB). The AIS-ZnS core–shell QDs and the corresponding QD/TiO2 nanocomposites were synthesized directly in an aqueous medium followed by annealing. The optical properties of the AIS-ZnS core–shell QDs showed strong yellow photoluminescence, which decreased gradually with the addition of TiO2. Fourier transform infrared (FTIR) spectroscopy confirmed the GSH capping on the QDs and nanocomposites. X-ray diffraction and transmission electron microscopy revealed the nanocrystalline nature and shape of the as-synthesized materials and showed the integration of the QDs (3.9 nm) on the TiO2 particles after annealing. These materials were then investigated as a photocatalyst for MB degradation using visible light irradiation. The effect of TiO2 content in the catalyst, calcination, photoirradiation period, catalyst dose, and initial MB concentration on photodegradation of MB was studied. The results indicated that the AIS-ZnS QD/TiO2 nanocomposite exhibited better photodegradation performance compared to AIS-ZnS QDs and TiO2. The increasing TiO2 concentration in the nanocomposite also enhanced MB degradation efficiency (up to 99%). The kinetics of MB degradation follows a pseudo-first-order process. The prepared AIS-ZnS QD/TiO2 nanocomposite would serve as an effective and eco-friendly photocatalyst for MB degradation.","PeriodicalId":54222,"journal":{"name":"Nano Futures","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2023-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44670101","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}
Semiconductor quantum rods (QRs) emit polarized light, which shows great promise in the development of modern display devices with regard to energy efficiency and color enhancement. Here we demonstrate stretching of an aligned QR polarized film for brightness enhancement and optical efficiency improvement of current quantum-dot based displays. Study of the relationship between the QR material, stretching ratio and degree of alignment provides a guide for the fabrication of highly polarized QR film. A large-area film with a high degree of alignment of 0.635 and more than 1.6-fold enhancement of brightness and transmittance compared with the traditional structure was achieved, making the film a viable candidate for use in various energy-saving display devices.
{"title":"Controllable assessment of quantum rods with polarized emission for display applications","authors":"Lixuan Chen, Jinyang Zhao, Zhiqing Shi, Miao Zhou, Shenmin Zhang, Xiaowei Sun, Xin Zhang","doi":"10.1088/2399-1984/acae5a","DOIUrl":"https://doi.org/10.1088/2399-1984/acae5a","url":null,"abstract":"Semiconductor quantum rods (QRs) emit polarized light, which shows great promise in the development of modern display devices with regard to energy efficiency and color enhancement. Here we demonstrate stretching of an aligned QR polarized film for brightness enhancement and optical efficiency improvement of current quantum-dot based displays. Study of the relationship between the QR material, stretching ratio and degree of alignment provides a guide for the fabrication of highly polarized QR film. A large-area film with a high degree of alignment of 0.635 and more than 1.6-fold enhancement of brightness and transmittance compared with the traditional structure was achieved, making the film a viable candidate for use in various energy-saving display devices.","PeriodicalId":54222,"journal":{"name":"Nano Futures","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2023-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47723875","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}
Pub Date : 2023-01-04DOI: 10.1088/2399-1984/acb02b
S. Azizi, M. Askari, M. T. T. Moghadam, M. Seifi, A. Di Bartolomeo
We present a one-step hydrothermal synthesis of hybrids consisting of nickel sulfides in the form of Ni3S4–NiS (NN) and Ni3S4–NiS-rGO (NNR), i.e. with the addition of reduced graphene oxide (rGO), for application as catalysts. After accurate physical characterization and confirmation of successful synthesis, we evaluate the ability of these catalysts in the processes of methanol and ethanol oxidation. The precise electrochemical analyses show relatively good potential and excellent cyclic stability in methanol oxidation reaction (MOR) and ethanol oxidation reaction (EOR) processes. The comparison of the two catalysts shows the superiority of NNR over NN, confirming that rGO introduces a higher specific surface area and a higher electrical conductivity in the NNR structure. In the process of MOR, NNR has an oxidation peak at a current density of 55 mA cm−2 and a peak potential of 0.54 V. In EOR, this peak is located at a current density of 11 mA cm−2 and at a peak potential of 0.59 V. NNR has 97% and 94% stability in MOR and EOR after 1000 consecutive cycles, respectively, which are acceptable values.
我们提出了一步水热合成由Ni3S4-NiS (NN)和Ni3S4-NiS -rGO (NNR)形式的硫化镍组成的杂化物，即加入还原氧化石墨烯(rGO)作为催化剂。在进行了准确的物理表征和确认成功合成后，我们评估了这些催化剂在甲醇和乙醇氧化过程中的能力。精确的电化学分析表明，该材料在甲醇氧化反应(MOR)和乙醇氧化反应(EOR)过程中具有较好的应用潜力和良好的循环稳定性。两种催化剂的比较表明NNR优于NN，证实了还原氧化石墨烯在NNR结构中引入了更高的比表面积和更高的导电性。在MOR过程中，NNR在电流密度为55 mA cm−2时出现氧化峰，峰值电位为0.54 V。在EOR中，该峰值位于电流密度为11 mA cm - 2，峰值电位为0.59 V。连续1000次循环后，NNR的MOR和EOR稳定性分别为97%和94%，这是可接受的值。
{"title":"Ni3S4/NiS/rGO as a promising electrocatalyst for methanol and ethanol electro-oxidation","authors":"S. Azizi, M. Askari, M. T. T. Moghadam, M. Seifi, A. Di Bartolomeo","doi":"10.1088/2399-1984/acb02b","DOIUrl":"https://doi.org/10.1088/2399-1984/acb02b","url":null,"abstract":"We present a one-step hydrothermal synthesis of hybrids consisting of nickel sulfides in the form of Ni3S4–NiS (NN) and Ni3S4–NiS-rGO (NNR), i.e. with the addition of reduced graphene oxide (rGO), for application as catalysts. After accurate physical characterization and confirmation of successful synthesis, we evaluate the ability of these catalysts in the processes of methanol and ethanol oxidation. The precise electrochemical analyses show relatively good potential and excellent cyclic stability in methanol oxidation reaction (MOR) and ethanol oxidation reaction (EOR) processes. The comparison of the two catalysts shows the superiority of NNR over NN, confirming that rGO introduces a higher specific surface area and a higher electrical conductivity in the NNR structure. In the process of MOR, NNR has an oxidation peak at a current density of 55 mA cm−2 and a peak potential of 0.54 V. In EOR, this peak is located at a current density of 11 mA cm−2 and at a peak potential of 0.59 V. NNR has 97% and 94% stability in MOR and EOR after 1000 consecutive cycles, respectively, which are acceptable values.","PeriodicalId":54222,"journal":{"name":"Nano Futures","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2023-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48332463","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}
The design and motif-tailoring of peptide sequences are crucial for mediating the self-assembly of peptide molecules and the biomimetic synthesis of functional peptide-based nanomaterials. It is well known that nature provides guidance and inspiration for the design and molecular tailoring of functional peptide sequences, which can further self-assemble into complex peptide nanomaterials with adjustable dimensions. In this mini-review, we summarize recent advances in the bioinspired design and regulation of functional peptide sequences by natural things, such as mussels, milk protein, silkworm silk, frogs and Alzheimer’s disease. The self-assembly of bioinspired peptides in vitro and in vivo for controlled synthesis of various peptide-based nanomaterials is introduced and analyzed. In addition, various applications of biomimetic peptide nanomaterials for biosensors, bioimaging, cancer therapy, antibacterial materials, tissue engineering, as well as energy storage and environmental science are demonstrated in detail. Finally, we give perspectives on the future development of this promising research topic. With these efforts, we hope to promote the understanding of the optimization of bioinspired peptides and the design of novel peptide nanomaterials for advanced applications.
{"title":"Self-assembly of bioinspired peptides for biomimetic synthesis of advanced peptide-based nanomaterials: a mini-review","authors":"Hao Kong, Guozheng Yang, Peng He, Danzhu Zhu, Xin Luan, Youyin Xu, RongQiu Mu, Gang Wei","doi":"10.1088/2399-1984/acafbe","DOIUrl":"https://doi.org/10.1088/2399-1984/acafbe","url":null,"abstract":"The design and motif-tailoring of peptide sequences are crucial for mediating the self-assembly of peptide molecules and the biomimetic synthesis of functional peptide-based nanomaterials. It is well known that nature provides guidance and inspiration for the design and molecular tailoring of functional peptide sequences, which can further self-assemble into complex peptide nanomaterials with adjustable dimensions. In this mini-review, we summarize recent advances in the bioinspired design and regulation of functional peptide sequences by natural things, such as mussels, milk protein, silkworm silk, frogs and Alzheimer’s disease. The self-assembly of bioinspired peptides in vitro and in vivo for controlled synthesis of various peptide-based nanomaterials is introduced and analyzed. In addition, various applications of biomimetic peptide nanomaterials for biosensors, bioimaging, cancer therapy, antibacterial materials, tissue engineering, as well as energy storage and environmental science are demonstrated in detail. Finally, we give perspectives on the future development of this promising research topic. With these efforts, we hope to promote the understanding of the optimization of bioinspired peptides and the design of novel peptide nanomaterials for advanced applications.","PeriodicalId":54222,"journal":{"name":"Nano Futures","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2023-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42827251","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}
Pub Date : 2022-12-06DOI: 10.1088/2399-1984/aca943
S. M. Sadeghi, Rithvik R. Gutha, C. Sharp
We study the impact of Al oxide/Poly(methyl methacrylate) (PMMA) interface on plasmonic emission enhancement of infrared semiconductor quantum dots (QDs). For this, PbS QDs embedded in PMMA matrix are deposited on the top of heterostructures consisting of a Au thin film, a dielectric spacer, and an ultrathin layer of Al oxide. Our results suggest that such structures can support an emission enhancement far more than what can be reached in the cases when the QDs/PMMA films are placed on Au thin film/dielectric spacer directly, i.e. in the absence of the Al oxide. We also demonstrate that Au/Si/Al oxide/PMMA heterostructures can increase the photo-induced fluorescence enhancement of PbS QDs, making them brighter as they are irradiated with a laser field. We discuss these results in terms of combined effects of plasmonic field enhancement (Purcell effect) and the carboxylate anion bonds formed at the Al oxide/PMMA interface.
{"title":"Amplified plasmonic emission enhancement of PbS quantum dots via Al-oxide/PMMA heterostructures","authors":"S. M. Sadeghi, Rithvik R. Gutha, C. Sharp","doi":"10.1088/2399-1984/aca943","DOIUrl":"https://doi.org/10.1088/2399-1984/aca943","url":null,"abstract":"We study the impact of Al oxide/Poly(methyl methacrylate) (PMMA) interface on plasmonic emission enhancement of infrared semiconductor quantum dots (QDs). For this, PbS QDs embedded in PMMA matrix are deposited on the top of heterostructures consisting of a Au thin film, a dielectric spacer, and an ultrathin layer of Al oxide. Our results suggest that such structures can support an emission enhancement far more than what can be reached in the cases when the QDs/PMMA films are placed on Au thin film/dielectric spacer directly, i.e. in the absence of the Al oxide. We also demonstrate that Au/Si/Al oxide/PMMA heterostructures can increase the photo-induced fluorescence enhancement of PbS QDs, making them brighter as they are irradiated with a laser field. We discuss these results in terms of combined effects of plasmonic field enhancement (Purcell effect) and the carboxylate anion bonds formed at the Al oxide/PMMA interface.","PeriodicalId":54222,"journal":{"name":"Nano Futures","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2022-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44655231","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}
Pub Date : 2022-11-08DOI: 10.1088/2399-1984/aca130
Ava G. Crowley, T. Tran, Micah J. Green
Additive manufacturing (AM) technologies, also called 3D printing, have dramatically developed over the past decade to allow new capabilities in materials processing with printed resolution comparable to that of traditional manufacturing techniques. Sequential layer deposition can lead to the creation of complex parts with minimized material waste, high manufacturing throughput, and increased prototyping ability, while also meeting the demand for mid- and low-volume production. The AM of polymer nanocomposites is a growing area of research because nanomaterial additives can enhance the mechanical, electrical, and other properties for end-use applications. However, the use of nanomaterial inclusions can also enhance the AM processes themselves. Here, we discuss works where nanomaterials are employed as local heaters for fused deposition modeling, as viscosifiers for direct ink writing, and as photothermal sensitizers for selective laser sintering and vat polymerization. We also note the disconnect between the researched AM capabilities and current industrial manufacturing; nanomaterials can bridge the technological gap and lead to new common practices in industrial manufacturing spaces.
{"title":"Using nanomaterials to enhance the additive manufacturing of polymeric resins","authors":"Ava G. Crowley, T. Tran, Micah J. Green","doi":"10.1088/2399-1984/aca130","DOIUrl":"https://doi.org/10.1088/2399-1984/aca130","url":null,"abstract":"Additive manufacturing (AM) technologies, also called 3D printing, have dramatically developed over the past decade to allow new capabilities in materials processing with printed resolution comparable to that of traditional manufacturing techniques. Sequential layer deposition can lead to the creation of complex parts with minimized material waste, high manufacturing throughput, and increased prototyping ability, while also meeting the demand for mid- and low-volume production. The AM of polymer nanocomposites is a growing area of research because nanomaterial additives can enhance the mechanical, electrical, and other properties for end-use applications. However, the use of nanomaterial inclusions can also enhance the AM processes themselves. Here, we discuss works where nanomaterials are employed as local heaters for fused deposition modeling, as viscosifiers for direct ink writing, and as photothermal sensitizers for selective laser sintering and vat polymerization. We also note the disconnect between the researched AM capabilities and current industrial manufacturing; nanomaterials can bridge the technological gap and lead to new common practices in industrial manufacturing spaces.","PeriodicalId":54222,"journal":{"name":"Nano Futures","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2022-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47832293","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}
Pub Date : 2022-10-25DOI: 10.1088/2399-1984/ac9d78
Pavar Sai Kumar, Paul A. Advincula, S. Goel
Graphene-based materials are excellent acceptors of the CRET phenomenon. Due to the presence of π -conjugated planar structure, these materials were reported to quench the chemiluminescence (CL) signal. Based on this fact, herein, for the first time, the recovery of quenched CL signal from different graphene-based materials is successfully obtained through the catalytic activity of onsite temperature. The maximum recovery of a quenched signal at an optimum temperature of 70 ∘C was 1440% from the 10 mg ml−1 reduced graphene oxide paper analytical devices. The recovery of flash graphene and laser induced graphene materials were found to be 895% and 521%, respectively, for the same conditions via the generation of π -conjugated carbon radicals. Catechin, an antioxidant, was analyzed from 0.1 nM to 500 nM to interpret the generation of carbon radicals from graphenized materials. The proposed smartphone-enabled onsite heating recovery model was validated with the lower limit of 94 pM (27.3 pg ml−1) of catechin concentration without advanced photodiodes or instrumentation. The validation was performed in real samples of green tea (1 and 2). This method of CL recovery can be a future model for indicating the purity of graphene-based materials without using advanced instrumentations.
{"title":"First report on onsite temperature based recovery of quenched chemiluminescence signal from graphenized μPADs: validation by catechins radical scavenging","authors":"Pavar Sai Kumar, Paul A. Advincula, S. Goel","doi":"10.1088/2399-1984/ac9d78","DOIUrl":"https://doi.org/10.1088/2399-1984/ac9d78","url":null,"abstract":"Graphene-based materials are excellent acceptors of the CRET phenomenon. Due to the presence of π -conjugated planar structure, these materials were reported to quench the chemiluminescence (CL) signal. Based on this fact, herein, for the first time, the recovery of quenched CL signal from different graphene-based materials is successfully obtained through the catalytic activity of onsite temperature. The maximum recovery of a quenched signal at an optimum temperature of 70 ∘C was 1440% from the 10 mg ml−1 reduced graphene oxide paper analytical devices. The recovery of flash graphene and laser induced graphene materials were found to be 895% and 521%, respectively, for the same conditions via the generation of π -conjugated carbon radicals. Catechin, an antioxidant, was analyzed from 0.1 nM to 500 nM to interpret the generation of carbon radicals from graphenized materials. The proposed smartphone-enabled onsite heating recovery model was validated with the lower limit of 94 pM (27.3 pg ml−1) of catechin concentration without advanced photodiodes or instrumentation. The validation was performed in real samples of green tea (1 and 2). This method of CL recovery can be a future model for indicating the purity of graphene-based materials without using advanced instrumentations.","PeriodicalId":54222,"journal":{"name":"Nano Futures","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2022-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47654687","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}
Pub Date : 2022-10-24DOI: 10.1088/2399-1984/ac9d12
D. K. Mohapatra, M. Sahoo, S. Praharaj, D. Rout
The development of novel nanostructured composites is of current interest for applications as electrode materials. In this regard, an attempt has been made to synthesize NiCo2O4@V2O5 nanocomposite and compare its charge storage performance with pristine NiCo2O4 nanoparticles. High-resolution scanning electron microscope micrographs reveal a mesoporous nanobelt like morphology of the nanocomposite with a Brunauer–Emmett–Teller surface area of ∼65 m2 g−1 and average mesopore size centered on ∼7.55 nm. Electrochemical measurements performed on both samples anticipate capacitive behavior with quasi-reversible redox reactions. However, NiCo2O4@V2O5 is found to demonstrate a strikingly high specific capacity of 194 mAh g−1 at 1 A g−1 along with a notable capacity retention of ∼90%, even after 3000 charge–discharge cycles, and a Coulombic efficiency >97% at 5 A g−1. These features are much superior to the properties of pristine NiCo2O4 nanoparticles. The results obtained in this work ascertain the functional robustness of NiCo2O4@V2O5 nanocomposites as electrode materials in supercapacitors.
{"title":"NiCo2O4@V2O5 nanobelts as electrode materials for efficient electrochemical charge storage","authors":"D. K. Mohapatra, M. Sahoo, S. Praharaj, D. Rout","doi":"10.1088/2399-1984/ac9d12","DOIUrl":"https://doi.org/10.1088/2399-1984/ac9d12","url":null,"abstract":"The development of novel nanostructured composites is of current interest for applications as electrode materials. In this regard, an attempt has been made to synthesize NiCo2O4@V2O5 nanocomposite and compare its charge storage performance with pristine NiCo2O4 nanoparticles. High-resolution scanning electron microscope micrographs reveal a mesoporous nanobelt like morphology of the nanocomposite with a Brunauer–Emmett–Teller surface area of ∼65 m2 g−1 and average mesopore size centered on ∼7.55 nm. Electrochemical measurements performed on both samples anticipate capacitive behavior with quasi-reversible redox reactions. However, NiCo2O4@V2O5 is found to demonstrate a strikingly high specific capacity of 194 mAh g−1 at 1 A g−1 along with a notable capacity retention of ∼90%, even after 3000 charge–discharge cycles, and a Coulombic efficiency >97% at 5 A g−1. These features are much superior to the properties of pristine NiCo2O4 nanoparticles. The results obtained in this work ascertain the functional robustness of NiCo2O4@V2O5 nanocomposites as electrode materials in supercapacitors.","PeriodicalId":54222,"journal":{"name":"Nano Futures","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2022-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43056285","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}
A cathode with single-crystal structure for Li-ion batteries is shown to provide stable cycle performance because of its integrated crystal structure and smaller internal stress. Here, Na+ ions with larger radius are doped into LiNi1/3Co1/3Mn1/3O2 (LNCMO) single-crystal nanoparticles through a simple sol–gel method to further improve the rate capability. Different amounts of Na doping are considered to illustrate the cooperative effect of single-crystal structure and Na doping. The results indicate that a Li0.9Na0.1Ni1/3Co1/3Mn1/3O2 cathode has a discharge capacity of 193.7 mAh g–1 at 0.2 C, much higher than the 174.8 mAh g–1 of its undoped counterpart. After 50 cycles, the capacity retention is enhanced from 71.3% for undoped LNCMO to 89.2% for Li0.9Na0.1Ni1/3Co1/3Mn1/3O2. At the same time, Li0.9Na0.1Ni1/3Co1/3Mn1/3O2 delivers a discharge capacity of 137.9 mAh g–1 at 10 C, about twice the capacity of LNCMO. Na ions doped into the lattice can magnify the distances between lithium layers and act as pins for more stable structure and faster kinetics of Li+-ion diffusion.
单晶结构的锂离子电池阴极由于具有完整的晶体结构和较小的内应力，具有稳定的循环性能。本文通过简单的溶胶-凝胶法将半径较大的Na+离子掺杂到LiNi1/3Co1/3Mn1/3O2 (LNCMO)单晶纳米颗粒中，进一步提高了速率能力。为了说明单晶结构与钠掺杂的协同效应，考虑了不同钠掺杂量。结果表明，在0.2℃下，Li0.9Na0.1Ni1/3Co1/3Mn1/3O2阴极的放电容量为193.7 mAh g-1，远高于未掺杂Li0.9Na0.1Ni1/3Co1/3Mn1/3O2阴极的174.8 mAh g-1。循环50次后，未掺杂LNCMO的容量保持率从71.3%提高到Li0.9Na0.1Ni1/3Co1/3Mn1/3O2的89.2%。同时，Li0.9Na0.1Ni1/3Co1/3Mn1/3O2在10℃下的放电容量为137.9 mAh g-1，约为LNCMO的两倍。在晶格中掺入Na离子可以放大锂层之间的距离，并作为引脚，使结构更稳定，Li+离子扩散动力学更快。
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Pub Date : 2022-10-13DOI: 10.1088/2399-1984/ac9a19
Samin Naghash-Hamed, N. Arsalani, Seyed Borhan Mousavi
Para-nitroaniline (PNA) and ortho-nitroaniline (ONA) are highly toxic contaminants in aqueous solution and must be treated. In the current investigation, novel magnetic nanocomposites containing copper ferrite (CuFe2O4) and gelatin-derived carbon quantum dots (CQDs) were successfully synthesized. The prepared nanocatalyst was characterized by scanning electron microscopy, x-ray diffraction, transmission electron microscopy, Brunauer–Emmet–Teller (BET), Fourier transform infrared and ultraviolet–visible techniques. The mesoporous structure of the CuFe2O4/CQD nanocomposite was shown using the BET/Barrett–Joyner–Halenda technique. The catalytic performance of the nanocatalyst during the reduction of PNA and ONA was assessed in an aqueous medium at 25 °C. The complete reduction of PNA and ONA using the CuFe2O2/CQDs nanocomposite occurred in 13 s and 35 s, respectively. The pseudo-second-order rate constant (K app) was obtained as 2.89 × 10−1 s−1 and 9.3 × 10−2 s−1 for reducing PNA and ONA, respectively. Moreover, the magnetic nanocatalyst was easily separated from the reaction solution and recycled for up to six consecutive cycles without significant loss of catalytic activity.
{"title":"Facile copper ferrite/carbon quantum dot magnetic nanocomposite as an effective nanocatalyst for reduction of para-nitroaniline and ortho-nitroaniline","authors":"Samin Naghash-Hamed, N. Arsalani, Seyed Borhan Mousavi","doi":"10.1088/2399-1984/ac9a19","DOIUrl":"https://doi.org/10.1088/2399-1984/ac9a19","url":null,"abstract":"Para-nitroaniline (PNA) and ortho-nitroaniline (ONA) are highly toxic contaminants in aqueous solution and must be treated. In the current investigation, novel magnetic nanocomposites containing copper ferrite (CuFe2O4) and gelatin-derived carbon quantum dots (CQDs) were successfully synthesized. The prepared nanocatalyst was characterized by scanning electron microscopy, x-ray diffraction, transmission electron microscopy, Brunauer–Emmet–Teller (BET), Fourier transform infrared and ultraviolet–visible techniques. The mesoporous structure of the CuFe2O4/CQD nanocomposite was shown using the BET/Barrett–Joyner–Halenda technique. The catalytic performance of the nanocatalyst during the reduction of PNA and ONA was assessed in an aqueous medium at 25 °C. The complete reduction of PNA and ONA using the CuFe2O2/CQDs nanocomposite occurred in 13 s and 35 s, respectively. The pseudo-second-order rate constant (K app) was obtained as 2.89 × 10−1 s−1 and 9.3 × 10−2 s−1 for reducing PNA and ONA, respectively. Moreover, the magnetic nanocatalyst was easily separated from the reaction solution and recycled for up to six consecutive cycles without significant loss of catalytic activity.","PeriodicalId":54222,"journal":{"name":"Nano Futures","volume":null,"pages":null},"PeriodicalIF":2.1,"publicationDate":"2022-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43238137","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}
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