Pub Date : 2024-02-28DOI: 10.1016/j.mtadv.2024.100475
Kyu Hyun Han, Seung-Geun Kim, Seung-Hwan Kim, Jong-Hyun Kim, Seong-Hyun Hwang, Min-Su Kim, Sung-Joo Song, Hyun-Yong Yu
Negative differential resistance (NDR) devices have recently attracted interest as multi-valued logic (MVL) circuits, owing to their folded electrical characteristics. However, with necessity of sophisticated computing systems, advanced NDR devices are required for stable low-power-consumption MVL circuits. Here, we developed van der Waals (vdW) NDR device with high peak-to-valley current ratio (PVCR) and low peak voltage (V), utilizing the passivation and doping effects of APTES layer as aminosilane coupling agent, at dielectric interface. The PVCR of NDR device reached 10 through reduced interface trap owing to the passivation effect of APTES silane group. Additionally, low V of NDR device was achieved at 0.2 V through doping effect of the APTES amine group. These PVCR and V values indicate the one of the best vdW NDR performance. Furthermore, stable logic state and low operation voltage of the ternary inverter were implemented using NDR device with high PVCR and low V. This NDR device represents a significant advancement for next-generation MVL technologies.
{"title":"Dielectric interface engineering using aminosilane coupling agent for enhancement of negative differential resistance phenomenon","authors":"Kyu Hyun Han, Seung-Geun Kim, Seung-Hwan Kim, Jong-Hyun Kim, Seong-Hyun Hwang, Min-Su Kim, Sung-Joo Song, Hyun-Yong Yu","doi":"10.1016/j.mtadv.2024.100475","DOIUrl":"https://doi.org/10.1016/j.mtadv.2024.100475","url":null,"abstract":"Negative differential resistance (NDR) devices have recently attracted interest as multi-valued logic (MVL) circuits, owing to their folded electrical characteristics. However, with necessity of sophisticated computing systems, advanced NDR devices are required for stable low-power-consumption MVL circuits. Here, we developed van der Waals (vdW) NDR device with high peak-to-valley current ratio (PVCR) and low peak voltage (V), utilizing the passivation and doping effects of APTES layer as aminosilane coupling agent, at dielectric interface. The PVCR of NDR device reached 10 through reduced interface trap owing to the passivation effect of APTES silane group. Additionally, low V of NDR device was achieved at 0.2 V through doping effect of the APTES amine group. These PVCR and V values indicate the one of the best vdW NDR performance. Furthermore, stable logic state and low operation voltage of the ternary inverter were implemented using NDR device with high PVCR and low V. This NDR device represents a significant advancement for next-generation MVL technologies.","PeriodicalId":48495,"journal":{"name":"Materials Today Advances","volume":null,"pages":null},"PeriodicalIF":10.0,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140046186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-02-27DOI: 10.1016/j.mtadv.2024.100478
Muhammad Latif, Yangxiaozhe Jiang, Jaehwan Kim
Nanocellulose (NC)-based piezoelectric films prepared via solution casting show low mechanical, dielectric, and piezoelectric performance due to the randomly oriented cellulose nanofibers and dispersion of piezoelectric domains. Moreover, a high electric field for piezoelectric domain alignment may also increase the brittleness of the piezoelectric films. For the first time, an additive manufacturing (AM) technology is demonstrated to fabricate high mechanical strength and flexible NC-based piezoelectric films efficiently. Different concentrations (10, 20, and 30 wt%) of lead zirconate titanate (PZT) particles are mixed in the NC suspension and additively manufactured, followed by drying at cleanroom conditions. Next, the magnetically induced electric field is introduced into the PZT-NC films coated with silver electrodes. The obtained flexible piezoelectric PZT-NC films show outstanding mechanical strength of 203.5 ± 4.8 MPa, good flexibility, high dielectric constant (87.7 at 1 kHz), low dielectric loss (0.09 at 1 kHz), and high piezoelectric constant (d = 53 pC/N). Furthermore, the 30PZT-NC piezoelectric nanogenerator showed a peak-to-peak voltage of 2.24 V and an output power density of 1.56 μW/cm. The measured mechanical, dielectric, and piezoelectric properties are superior to the previously reported NC-based piezoelectric and commercially available PVDF films. Based on the outstanding multifunctional properties of NC-based piezoelectric films, AM technology can replace traditional solution casting methods and open a wide range of applications in flexible piezoelectric materials.
{"title":"Additively manufactured flexible piezoelectric lead zirconate titanate-nanocellulose films with outstanding mechanical strength, dielectric and piezoelectric properties","authors":"Muhammad Latif, Yangxiaozhe Jiang, Jaehwan Kim","doi":"10.1016/j.mtadv.2024.100478","DOIUrl":"https://doi.org/10.1016/j.mtadv.2024.100478","url":null,"abstract":"Nanocellulose (NC)-based piezoelectric films prepared via solution casting show low mechanical, dielectric, and piezoelectric performance due to the randomly oriented cellulose nanofibers and dispersion of piezoelectric domains. Moreover, a high electric field for piezoelectric domain alignment may also increase the brittleness of the piezoelectric films. For the first time, an additive manufacturing (AM) technology is demonstrated to fabricate high mechanical strength and flexible NC-based piezoelectric films efficiently. Different concentrations (10, 20, and 30 wt%) of lead zirconate titanate (PZT) particles are mixed in the NC suspension and additively manufactured, followed by drying at cleanroom conditions. Next, the magnetically induced electric field is introduced into the PZT-NC films coated with silver electrodes. The obtained flexible piezoelectric PZT-NC films show outstanding mechanical strength of 203.5 ± 4.8 MPa, good flexibility, high dielectric constant (87.7 at 1 kHz), low dielectric loss (0.09 at 1 kHz), and high piezoelectric constant (d = 53 pC/N). Furthermore, the 30PZT-NC piezoelectric nanogenerator showed a peak-to-peak voltage of 2.24 V and an output power density of 1.56 μW/cm. The measured mechanical, dielectric, and piezoelectric properties are superior to the previously reported NC-based piezoelectric and commercially available PVDF films. Based on the outstanding multifunctional properties of NC-based piezoelectric films, AM technology can replace traditional solution casting methods and open a wide range of applications in flexible piezoelectric materials.","PeriodicalId":48495,"journal":{"name":"Materials Today Advances","volume":null,"pages":null},"PeriodicalIF":10.0,"publicationDate":"2024-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140006950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-02-23DOI: 10.1016/j.mtadv.2024.100476
Shixia Wang, Yalin Wang, Tao Liu, Lu Wang, Yuxuan Huang, Yang Lu
{"title":"Irreversible pressure effect on phase transitions and bandgap narrowing of layered MoO3","authors":"Shixia Wang, Yalin Wang, Tao Liu, Lu Wang, Yuxuan Huang, Yang Lu","doi":"10.1016/j.mtadv.2024.100476","DOIUrl":"https://doi.org/10.1016/j.mtadv.2024.100476","url":null,"abstract":"","PeriodicalId":48495,"journal":{"name":"Materials Today Advances","volume":null,"pages":null},"PeriodicalIF":10.0,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139946681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-02-17DOI: 10.1016/j.mtadv.2024.100470
Busra Ozlu, Mohammad Boshir Ahmed, Ruth M. Muthoka, Zuwang Wen, Yechan Bea, Ji Ho Youk, Yongjin Lee, Myung Han Yoon, Bong Sup Shim
Amid the escalating demand for electronic devices, electronic waste poses a critical environmental dilemma. While current recovery techniques offer some respite, their efficacy is still debated. A burgeoning discourse emphasizes the potential of naturally derived conducting materials (i.e., melanin, indigo, and carotenoids), advocating their utility in fabricating biocompatible and biodegradable electronics. This review critically examines this emerging paradigm of green electronics. Beyond a mere overview, we interrogate such materials′ physical, chemical, and electrical performances, paying particular attention to the charge transport dynamics in substances like melanin, indigo, and carotenoids. In doing so, we shed light on potential pitfalls and broach unresolved challenges to developing biodegradable electronics. This review finding indicates that naturally derived conducting materials have great potential to develop eco-friendly electronics. We also suggest pivotal future directions for truly sustainable electronics development.
{"title":"Naturally derived electrically active materials for eco-friendly electronics","authors":"Busra Ozlu, Mohammad Boshir Ahmed, Ruth M. Muthoka, Zuwang Wen, Yechan Bea, Ji Ho Youk, Yongjin Lee, Myung Han Yoon, Bong Sup Shim","doi":"10.1016/j.mtadv.2024.100470","DOIUrl":"https://doi.org/10.1016/j.mtadv.2024.100470","url":null,"abstract":"Amid the escalating demand for electronic devices, electronic waste poses a critical environmental dilemma. While current recovery techniques offer some respite, their efficacy is still debated. A burgeoning discourse emphasizes the potential of naturally derived conducting materials (i.e., melanin, indigo, and carotenoids), advocating their utility in fabricating biocompatible and biodegradable electronics. This review critically examines this emerging paradigm of green electronics. Beyond a mere overview, we interrogate such materials′ physical, chemical, and electrical performances, paying particular attention to the charge transport dynamics in substances like melanin, indigo, and carotenoids. In doing so, we shed light on potential pitfalls and broach unresolved challenges to developing biodegradable electronics. This review finding indicates that naturally derived conducting materials have great potential to develop eco-friendly electronics. We also suggest pivotal future directions for truly sustainable electronics development.","PeriodicalId":48495,"journal":{"name":"Materials Today Advances","volume":null,"pages":null},"PeriodicalIF":10.0,"publicationDate":"2024-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139924683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-02-08DOI: 10.1016/j.mtadv.2024.100468
Stephen Taller, Luke Scime, Ty Austin
Over the past half century, the transmission electron microscope enabled insight into the fundamental arrangements and structures of materials. State-of-the-art electron microscopes can acquire large image datasets across multiple imaging modalities. However, the manual annotation process for feature or defect quantification may not be feasible with the modern microscope. Convolutional neural networks emerged to characterize individual microstructural features from an image in a cost-effective, consistent manner. However, many of these neural network approaches rely on thousands to hundreds of thousands of manual annotations of each feature type across hundreds of images to train the network for adequate performance. This work focused on the development and application of a pixel-wise defect detection machine-learning dynamic segmentation convolutional neural network with associated automated acquisition and postprocessing to identify microstructural features rapidly and quantitatively from a small initial dataset incorporating multiple imaging modes. The approach was demonstrated for characterization of superalloy 718 from both single image acquisition on multiple detectors to in-situ evolution captured with a single detector on a standard desktop computer to demonstrate the low barrier to entry required for widespread adoption. Pixel-by-pixel class identification was excellent with strong identification of chemically distinct phases, structurally distinct phases, and defect structures, thus demonstrating the new paradigm of machine learning-assisted characterization.
{"title":"A new paradigm in electron microscopy: Automated microstructure analysis utilizing a dynamic segmentation convolutional neutral network","authors":"Stephen Taller, Luke Scime, Ty Austin","doi":"10.1016/j.mtadv.2024.100468","DOIUrl":"https://doi.org/10.1016/j.mtadv.2024.100468","url":null,"abstract":"Over the past half century, the transmission electron microscope enabled insight into the fundamental arrangements and structures of materials. State-of-the-art electron microscopes can acquire large image datasets across multiple imaging modalities. However, the manual annotation process for feature or defect quantification may not be feasible with the modern microscope. Convolutional neural networks emerged to characterize individual microstructural features from an image in a cost-effective, consistent manner. However, many of these neural network approaches rely on thousands to hundreds of thousands of manual annotations of each feature type across hundreds of images to train the network for adequate performance. This work focused on the development and application of a pixel-wise defect detection machine-learning dynamic segmentation convolutional neural network with associated automated acquisition and postprocessing to identify microstructural features rapidly and quantitatively from a small initial dataset incorporating multiple imaging modes. The approach was demonstrated for characterization of superalloy 718 from both single image acquisition on multiple detectors to in-situ evolution captured with a single detector on a standard desktop computer to demonstrate the low barrier to entry required for widespread adoption. Pixel-by-pixel class identification was excellent with strong identification of chemically distinct phases, structurally distinct phases, and defect structures, thus demonstrating the new paradigm of machine learning-assisted characterization.","PeriodicalId":48495,"journal":{"name":"Materials Today Advances","volume":null,"pages":null},"PeriodicalIF":10.0,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139924670","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-02-07DOI: 10.1016/j.mtadv.2024.100471
Jasleen K. Bindra, Pragya R. Shrestha, Sebastian Engmann, Chad D. Cruz, David J. Gundlach, Emily G. Bittle, Jason P. Campbell
Time-resolved microwave conductivity (TRMC) is a contactless technique utilized for the investigation of carrier density, transport properties, trapping phenomena, and recombination parameters in charge transport materials. Traditional TRMC methods rely on resonant cavities or resonators, which impose limitations on the frequency range and accuracy of measurements. In this study, we introduce an innovative approach that employs a non-resonant coplanar transmission line and a microwave interferometric detection scheme to investigate the phase-dependent complex microwave conductivity. Additionally, we demonstrate unique calibration techniques for determining the absolute complex microwave conductivity by combining transient photoconductivity (TPC) and electron spin resonance (ESR) as complementary methods. By utilizing a phase-sensitive microwave interferometer, our detection scheme significantly enhances measurement sensitivity and eliminates the need for a resonant cavity. This broadband detection system enables direct measurement of phase-dependent changes in film conductivity (Δσ). Moreover, it allows us to measure subtle variations in sample photoconductivity upon optical excitation and accommodates greatly restricted volumes (∼nL) consistent with typical device sizes. Here we demonstrate the utility of this technique on a series of poly(3-hexylthiophene) (P3HT) and the electron acceptor [6,6]-phenylC61-butyric acid methyl ester (PCBM) thin films with varying concentrations of PCBM and film thickness.
{"title":"Non-resonant phase sensitive approach for time resolved microwave conductivity in photoactive thin films","authors":"Jasleen K. Bindra, Pragya R. Shrestha, Sebastian Engmann, Chad D. Cruz, David J. Gundlach, Emily G. Bittle, Jason P. Campbell","doi":"10.1016/j.mtadv.2024.100471","DOIUrl":"https://doi.org/10.1016/j.mtadv.2024.100471","url":null,"abstract":"Time-resolved microwave conductivity (TRMC) is a contactless technique utilized for the investigation of carrier density, transport properties, trapping phenomena, and recombination parameters in charge transport materials. Traditional TRMC methods rely on resonant cavities or resonators, which impose limitations on the frequency range and accuracy of measurements. In this study, we introduce an innovative approach that employs a non-resonant coplanar transmission line and a microwave interferometric detection scheme to investigate the phase-dependent complex microwave conductivity. Additionally, we demonstrate unique calibration techniques for determining the absolute complex microwave conductivity by combining transient photoconductivity (TPC) and electron spin resonance (ESR) as complementary methods. By utilizing a phase-sensitive microwave interferometer, our detection scheme significantly enhances measurement sensitivity and eliminates the need for a resonant cavity. This broadband detection system enables direct measurement of phase-dependent changes in film conductivity (Δσ). Moreover, it allows us to measure subtle variations in sample photoconductivity upon optical excitation and accommodates greatly restricted volumes (∼nL) consistent with typical device sizes. Here we demonstrate the utility of this technique on a series of poly(3-hexylthiophene) (P3HT) and the electron acceptor [6,6]-phenylC61-butyric acid methyl ester (PCBM) thin films with varying concentrations of PCBM and film thickness.","PeriodicalId":48495,"journal":{"name":"Materials Today Advances","volume":null,"pages":null},"PeriodicalIF":10.0,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139924991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The heavy reliance on fossil-based industries for basic chemicals not only contributes to severe global environmental problems but also hampers the sustainable development of the whole society. In addressing this issue, electrocatalysis utilizing biomass-derived platform chemicals provides a promising solution for the directed preparation of high-value chemicals. Among the various electrocatalysts, the remarkable appeal of COFs-based electrocatalysts has engendered great enthusiasm among researchers over the past decade due to the well-defined structure and large surface area of COFs. In this focused review, we highlight vital perspectives on the design, synthesis, and progress of COFs-based electrocatalysts in the electrocatalytic upgrading of biomass-derived platform chemicals. We provide a rational design of COFs-based electrocatalysts by incorporating metal species into the COFs frameworks and then regulate the local coordination environment and microstructure to facilitate efficient access to active centers, mass transportation, and electron transfer. This review offers a comprehensive understanding of the design principles underlying COFs-based electrocatalysts for platform molecules and its derivatives. Specifically, we thoroughly investigate the relationship between structure and performance, as well as synergistic effects within COFs-based electrocatalysts, aiming to shed light on the future design of next-generation electrocatalysts.
{"title":"Design, synthesis, and progress of covalent organic frameworks (COFs)-based electrocatalysts for valorisation of biomass-derived platform chemicals","authors":"Changyu Weng, Hongmei Yuan, Lungang Chen, Xinghua Zhang, Qi Zhang, Longlong Ma, Jianguo Liu","doi":"10.1016/j.mtadv.2024.100473","DOIUrl":"https://doi.org/10.1016/j.mtadv.2024.100473","url":null,"abstract":"The heavy reliance on fossil-based industries for basic chemicals not only contributes to severe global environmental problems but also hampers the sustainable development of the whole society. In addressing this issue, electrocatalysis utilizing biomass-derived platform chemicals provides a promising solution for the directed preparation of high-value chemicals. Among the various electrocatalysts, the remarkable appeal of COFs-based electrocatalysts has engendered great enthusiasm among researchers over the past decade due to the well-defined structure and large surface area of COFs. In this focused review, we highlight vital perspectives on the design, synthesis, and progress of COFs-based electrocatalysts in the electrocatalytic upgrading of biomass-derived platform chemicals. We provide a rational design of COFs-based electrocatalysts by incorporating metal species into the COFs frameworks and then regulate the local coordination environment and microstructure to facilitate efficient access to active centers, mass transportation, and electron transfer. This review offers a comprehensive understanding of the design principles underlying COFs-based electrocatalysts for platform molecules and its derivatives. Specifically, we thoroughly investigate the relationship between structure and performance, as well as synergistic effects within COFs-based electrocatalysts, aiming to shed light on the future design of next-generation electrocatalysts.","PeriodicalId":48495,"journal":{"name":"Materials Today Advances","volume":null,"pages":null},"PeriodicalIF":10.0,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139924990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-02-07DOI: 10.1016/j.mtadv.2024.100469
Hyunsub Shin, Sujeong Kim, Jaehun Lee, Harim Jeong, Sang Woo Joo, Chul-Tae Lee, Sun-Min Park, Misook Kang
This study aims to find an eco-friendly dual material to apply toward energy and antibacterial industry, and to identify their active sites. CuZnO nanoparticles (NPs) containing 10 % Cu ions into ZnO framework are synthesized using a facile hydrothermal method, and 10, 20, 30, or 40 nm-sized Ag NPs are loaded to obtain Ag@CuZnO particles. From the time-dependent increase in photocurrent density, it is confirmed that the Ag NPs has a photoelectron harvesting ability. Unlike ZnO and CuZnO, the Ag@CuZnO catalyst well splits water to generate hydrogen. Particularly, the catalyst loaded with 30 nm Ag NPs achieves the highest hydrogen production efficiency of 424.54 μmolg. This proves that the active sites generating hydrogen during water splitting are the Ag NP surfaces grafted onto the conduction band of the CuZnO particles. Contrastingly, antibacterial performances against are expressed in all samples of ZnO, CuZnO, and Ag@CuZnO. The antibacterial performance for the Ag NP-loaded sample slightly increases but it is not significant, indicating that the active site exhibiting the antibacterial activity is the hole of the valence band of CuZnO. In the end, this study revealed that the advantageous photocatalytic activity does not always express effective antibacterial activity because the active sites exhibiting photocatalytic and antibacterial properties may not be the same.
本研究旨在寻找一种环保的双重材料，应用于能源和抗菌工业，并确定其活性位点。研究采用简单的水热法合成了在 ZnO 框架中含有 10% Cu 离子的 CuZnO 纳米粒子（NPs），并负载了 10、20、30 或 40 nm 大小的 Ag NPs，得到 Ag@CuZnO 粒子。从光电流密度随时间增加的情况来看，Ag NPs 具有光电子收集能力。与 ZnO 和 CuZnO 不同，Ag@CuZnO 催化剂能很好地分裂水产生氢气。尤其是负载了 30 nm Ag NPs 的催化剂，制氢效率最高，达到 424.54 μmolg。这证明了在水分裂过程中产生氢气的活性位点是接枝在 CuZnO 颗粒导带上的 Ag NP 表面。相反，所有 ZnO、CuZnO 和 Ag@CuZnO 样品都具有抗菌性能。添加了 Ag NP 的样品的抗菌性能略有提高，但并不显著，这表明表现出抗菌活性的活性位点是 CuZnO 的价带空穴。最后，本研究揭示了光催化活性的优势并不总是有效的抗菌活性，因为表现光催化和抗菌特性的活性位点可能并不相同。
{"title":"Dual functionality for hydrogen production and antibacterial activity in Zn-deficient Cu0.1Zn0.9O photocatalyst loaded with Ag nanoparticles of various sizes","authors":"Hyunsub Shin, Sujeong Kim, Jaehun Lee, Harim Jeong, Sang Woo Joo, Chul-Tae Lee, Sun-Min Park, Misook Kang","doi":"10.1016/j.mtadv.2024.100469","DOIUrl":"https://doi.org/10.1016/j.mtadv.2024.100469","url":null,"abstract":"This study aims to find an eco-friendly dual material to apply toward energy and antibacterial industry, and to identify their active sites. CuZnO nanoparticles (NPs) containing 10 % Cu ions into ZnO framework are synthesized using a facile hydrothermal method, and 10, 20, 30, or 40 nm-sized Ag NPs are loaded to obtain Ag@CuZnO particles. From the time-dependent increase in photocurrent density, it is confirmed that the Ag NPs has a photoelectron harvesting ability. Unlike ZnO and CuZnO, the Ag@CuZnO catalyst well splits water to generate hydrogen. Particularly, the catalyst loaded with 30 nm Ag NPs achieves the highest hydrogen production efficiency of 424.54 μmolg. This proves that the active sites generating hydrogen during water splitting are the Ag NP surfaces grafted onto the conduction band of the CuZnO particles. Contrastingly, antibacterial performances against are expressed in all samples of ZnO, CuZnO, and Ag@CuZnO. The antibacterial performance for the Ag NP-loaded sample slightly increases but it is not significant, indicating that the active site exhibiting the antibacterial activity is the hole of the valence band of CuZnO. In the end, this study revealed that the advantageous photocatalytic activity does not always express effective antibacterial activity because the active sites exhibiting photocatalytic and antibacterial properties may not be the same.","PeriodicalId":48495,"journal":{"name":"Materials Today Advances","volume":null,"pages":null},"PeriodicalIF":10.0,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139924993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-02-07DOI: 10.1016/j.mtadv.2024.100465
Ning Zhu, Yaping Zhuang, Wanju Sun, Juan Wang, Fan Wang, Xiaoyu Han, Zeyu Han, Ming Ni, Wenguo Cui, Yan Qiu
Hydrogels have emerged as promising biomaterials for nerve regeneration due to their adjustable properties, structural resemblance to the extracellular matrix, and ability to promote cell adhesion and proliferation. This comprehensive review discusses the advantages, challenges, and future directions of various functional hydrogels. Advanced technologies for fabricating Multistructured hydrogel, including injectable hydrogels, hydrogel microspheres, fibrous hydrogels, 3D printing hydrogels, nanogels, stem cell-loaded hydrogels, electrical hydrogels, ultrasound hydrogels, and magnetic hydrogels, have been developed and studied for nerve regeneration. These technologies demonstrate the versatility of hydrogels in neural tissue repair. However, challenges such as biocompatibility, degradation rates, and scaffold design need to be addressed. Interdisciplinary research is necessary to develop innovative hydrogel systems that overcome these challenges and realize the potential of hydrogels for nerve regeneration. This review provides valuable insights into advanced hydrogel technologies and highlights their potential in regenerative medicine, particularly in neural regeneration. Researchers can use this knowledge to refine therapeutic approaches involving hydrogels for enhancing nerve regeneration.
{"title":"Multistructured hydrogel promotes nerve regeneration","authors":"Ning Zhu, Yaping Zhuang, Wanju Sun, Juan Wang, Fan Wang, Xiaoyu Han, Zeyu Han, Ming Ni, Wenguo Cui, Yan Qiu","doi":"10.1016/j.mtadv.2024.100465","DOIUrl":"https://doi.org/10.1016/j.mtadv.2024.100465","url":null,"abstract":"Hydrogels have emerged as promising biomaterials for nerve regeneration due to their adjustable properties, structural resemblance to the extracellular matrix, and ability to promote cell adhesion and proliferation. This comprehensive review discusses the advantages, challenges, and future directions of various functional hydrogels. Advanced technologies for fabricating Multistructured hydrogel, including injectable hydrogels, hydrogel microspheres, fibrous hydrogels, 3D printing hydrogels, nanogels, stem cell-loaded hydrogels, electrical hydrogels, ultrasound hydrogels, and magnetic hydrogels, have been developed and studied for nerve regeneration. These technologies demonstrate the versatility of hydrogels in neural tissue repair. However, challenges such as biocompatibility, degradation rates, and scaffold design need to be addressed. Interdisciplinary research is necessary to develop innovative hydrogel systems that overcome these challenges and realize the potential of hydrogels for nerve regeneration. This review provides valuable insights into advanced hydrogel technologies and highlights their potential in regenerative medicine, particularly in neural regeneration. Researchers can use this knowledge to refine therapeutic approaches involving hydrogels for enhancing nerve regeneration.","PeriodicalId":48495,"journal":{"name":"Materials Today Advances","volume":null,"pages":null},"PeriodicalIF":10.0,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139925194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 : 2024-02-06DOI: 10.1016/j.mtadv.2024.100472
Ariono Verdianto, Heechul Jung, Sang-Ok Kim
Elemental germanium (Ge) is considered a high-capacity anode material for lithium-ion batteries (LIBs). However, it suffers from severe capacity degradation and inherent material instability owing to inevitable volumetric changes during the alloying/dealloying reactions with lithium. In this study, we report a hierarchical architecture comprising Ge nanoparticles in electrospun carbon fibers (Ge@C) coated with an in situ grown NiCo2O4 (NCO) layer to enhance the structural stability and electrochemical reversibility of Ge. The Ge@C@NCO fibers possess unique features, including well-dispersed Ge in nitrogen-doped porous carbon network that serves as a conductive volumetric buffer. This configuration allows for effective volume accommodation and improved electronic conductivity. Moreover, the porous NCO contributed to enhanced reversible capacity and rapid ionic transfer during electrochemical reactions. As a result, the Ge@C@NCO anode exhibited an ultrahigh specific capacity of 981.7 mAh g−1 and excellent capacity retention over 200 cycles under a current density of 1 A g−1, indicating superior lithium storage properties compared to pure Ge. Additionally, it retained approximately 80 % of initial capacity after 300 cycles even at 5 A g−1, demonstrating fast charging capability. The outstanding performance of this hierarchical structure presents a new path for designing alloying-based anodes for high-energy-density LIBs.
元素锗（Ge）被认为是锂离子电池（LIB）的高容量负极材料。然而，由于在与锂的合金化/合金化反应过程中不可避免地会发生体积变化，因此它存在严重的容量衰减和固有的材料不稳定性。在本研究中，我们报告了一种由电纺碳纤维（Ge@C）中的 Ge 纳米颗粒组成的分层结构，该结构涂有原位生长的镍钴氧化物（NCO）层，可增强 Ge 的结构稳定性和电化学可逆性。Ge@C@NCO 纤维具有独特的特性，包括在掺氮多孔碳网络中良好分散的 Ge，该网络可作为导电体积缓冲器。这种结构可有效容纳体积并提高电子导电性。此外，多孔 NCO 还有助于增强电化学反应过程中的可逆容量和快速离子转移。因此，Ge@C@NCO 阳极表现出了 981.7 mAh g-1 的超高比容量，并且在电流密度为 1 A g-1 的条件下，经过 200 次循环后仍能保持极佳的容量，这表明其具有比纯 Ge 更优越的锂存储特性。此外，即使在 5 A g-1 的电流密度下，经过 300 次循环后，它仍能保持约 80% 的初始容量，显示了快速充电能力。这种分层结构的出色性能为设计基于合金的高能量密度锂离子电池阳极开辟了一条新路。
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