V. Lionas, D. Velessiotis, G. Pilatos, K. Giannakopoulos, A. Kyriakis, N. Glezos, D. Skarlatos
Carbon nanotubes (CNTs) have attracted interest for optoelectronic applications due to their unique electronic and optoelectronic properties. In particular, Multi‐Wall (MW) CNTs film acts as perfect photo‐collector surface with the possibility to tune the absorbance by controlling the film thickness. In this work, we demonstrate two types of hybrid Si‐MWCNTs photodetectors. The MWCNTs are solution‐ processed and deposited on n‐silicon substrate covered by two different dielectrics (Si3N4 or SiO2). The MWCNTs/SiO2/n‐Si device is used here as reference, since the SiO2/Si system is the most widely investigated structure in microelectronics. The electrical and optical characteristics of the reference device are compared with the corresponding of our basic MWCNTs/Si3N4 /n‐Si device. The MWCNTs are deposited on the substrate with the drop casting technique. Optical performance of the SiO2 device is comparable to the Si3N4 device thus revealing a quite interesting response under UV illumination. The Si3N4 device exhibited a peak Equivalent Quantum Efficiency (EQE) of 57% at 3μW of source illumination power, thus demonstrating a superior performance as compared to the SiO2 device (EQE of up to 55%, which is also promising for future applications). This performance can be attributed to the great absorption in UV region of CNTs layer. Apart from this technological goal, we also investigated how MWCNTs/Si3N4 or MWCNTs/SiO2 heterojunctions perform using standard electrical characterization techniques and how the presence of the CNTs change the dielectric characteristics of both substrates.This article is protected by copyright. All rights reserved.
{"title":"Optimizing Fabrication and Performance of Liquid‐Processed Carbon Nanotube Photodetectors on Various Substrates","authors":"V. Lionas, D. Velessiotis, G. Pilatos, K. Giannakopoulos, A. Kyriakis, N. Glezos, D. Skarlatos","doi":"10.1002/appl.202300121","DOIUrl":"https://doi.org/10.1002/appl.202300121","url":null,"abstract":"Carbon nanotubes (CNTs) have attracted interest for optoelectronic applications due to their unique electronic and optoelectronic properties. In particular, Multi‐Wall (MW) CNTs film acts as perfect photo‐collector surface with the possibility to tune the absorbance by controlling the film thickness. In this work, we demonstrate two types of hybrid Si‐MWCNTs photodetectors. The MWCNTs are solution‐ processed and deposited on n‐silicon substrate covered by two different dielectrics (Si3N4 or SiO2). The MWCNTs/SiO2/n‐Si device is used here as reference, since the SiO2/Si system is the most widely investigated structure in microelectronics. The electrical and optical characteristics of the reference device are compared with the corresponding of our basic MWCNTs/Si3N4 /n‐Si device. The MWCNTs are deposited on the substrate with the drop casting technique. Optical performance of the SiO2 device is comparable to the Si3N4 device thus revealing a quite interesting response under UV illumination. The Si3N4 device exhibited a peak Equivalent Quantum Efficiency (EQE) of 57% at 3μW of source illumination power, thus demonstrating a superior performance as compared to the SiO2 device (EQE of up to 55%, which is also promising for future applications). This performance can be attributed to the great absorption in UV region of CNTs layer. Apart from this technological goal, we also investigated how MWCNTs/Si3N4 or MWCNTs/SiO2 heterojunctions perform using standard electrical characterization techniques and how the presence of the CNTs change the dielectric characteristics of both substrates.This article is protected by copyright. All rights reserved.","PeriodicalId":503210,"journal":{"name":"Applied Research","volume":"32 18","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139778364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Achimovičová, Katarína Gáborová, Vladimír Girman, E. Dutková, Jaroslav Briančin, P. Levinský, V. Puchý
Silver(I) selenide, Ag2Se was very simply and conveniently prepared from Ag and Se powders in a stoichiometric ratio by one‐step mechanochemical synthesis after 10 min of milling in a planetary ball mill. The kinetics of this synthesis and the structural, morphological, optical, and thermoelectric properties of the product were studied. The crystal structure, physical properties, and morphology were characterised by X‐ray diffraction, specific surface area measurements, particle size distribution analysis, scanning and transmission electron microscopy. XRD confirmed the orthorhombic crystal structure of naumannite, Ag2Se. The electron microscopy revealed that the nanostructured product consisted of isolated rod‐shaped particles and agglomerated nanoparticles of irregular shape which formed clusters with a size > 30 μm. Crystallinity was inspected by selected area diffraction. The optical properties were studied using UV‐Vis and photoluminescence spectroscopy. The determined band gap energy of 1.15 eV was blue‐shifted relative to the bulk Ag2Se. For the densification of mechanochemically synthesized powdered Ag2Se, the spark plasma sintering method was applied to prepare a suitable sample for thermoelectric characterization. High‐temperature thermoelectric properties were evaluated in terms of the potential application of mechanochemically synthesized Ag2Se in energy conversion.This article is protected by copyright. All rights reserved.
在行星式球磨机中研磨 10 分钟后，通过一步机械化学合成法以原子和硒粉末为原料，非常简单方便地制备出了硒化银（I），即 Ag2Se。研究了这种合成的动力学以及产品的结构、形态、光学和热电特性。通过 X 射线衍射、比表面积测量、粒度分布分析、扫描和透射电子显微镜对晶体结构、物理性质和形态进行了表征。X 射线衍射证实了瑙锰矿 Ag2Se 的正长方晶体结构。电子显微镜显示，纳米结构产品由孤立的棒状颗粒和不规则形状的团聚纳米颗粒组成，这些颗粒形成的团块尺寸大于 30 微米。结晶度通过选区衍射法进行检测。利用紫外可见光谱和光致发光光谱对其光学特性进行了研究。所测定的 1.15 eV 带隙能与块状 Ag2Se 相比发生了蓝移。为了使机械化学合成的 Ag2Se 粉末致密化，采用了火花等离子烧结法制备出适合热电特性分析的样品。本文受版权保护。本文受版权保护。
{"title":"Simple mechanochemical synthesis, characterization, optical and thermoelectric properties of a nanostructured silver (I) selenide semiconductor","authors":"M. Achimovičová, Katarína Gáborová, Vladimír Girman, E. Dutková, Jaroslav Briančin, P. Levinský, V. Puchý","doi":"10.1002/appl.202300076","DOIUrl":"https://doi.org/10.1002/appl.202300076","url":null,"abstract":"Silver(I) selenide, Ag2Se was very simply and conveniently prepared from Ag and Se powders in a stoichiometric ratio by one‐step mechanochemical synthesis after 10 min of milling in a planetary ball mill. The kinetics of this synthesis and the structural, morphological, optical, and thermoelectric properties of the product were studied. The crystal structure, physical properties, and morphology were characterised by X‐ray diffraction, specific surface area measurements, particle size distribution analysis, scanning and transmission electron microscopy. XRD confirmed the orthorhombic crystal structure of naumannite, Ag2Se. The electron microscopy revealed that the nanostructured product consisted of isolated rod‐shaped particles and agglomerated nanoparticles of irregular shape which formed clusters with a size > 30 μm. Crystallinity was inspected by selected area diffraction. The optical properties were studied using UV‐Vis and photoluminescence spectroscopy. The determined band gap energy of 1.15 eV was blue‐shifted relative to the bulk Ag2Se. For the densification of mechanochemically synthesized powdered Ag2Se, the spark plasma sintering method was applied to prepare a suitable sample for thermoelectric characterization. High‐temperature thermoelectric properties were evaluated in terms of the potential application of mechanochemically synthesized Ag2Se in energy conversion.This article is protected by copyright. All rights reserved.","PeriodicalId":503210,"journal":{"name":"Applied Research","volume":"42 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139778105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Myco degradation is an effective technique for breaking down waste plant substances made of lignin, cellulose, and hemicellulose, which are collectively known as lignocellulose. This abundant organic material is found throughout the world. Due to its recalcitrant nature, lignocellulose poses a challenge for efficient conversion into biofuels, biochemicals, and other valuable products. Myco degradation, which involves the use of fungi to degrade lignocellulosic materials, offers a sustainable and cost‐efficient resolution to this challenge. This review provides an overview of the mechanisms and applications of myco degradation for lignocellulosic biomass degradation. The review discusses the various types of fungi involved in lignocellulose degradation, their enzymatic systems, and the factors that influences their performance. Furthermore, the potential applications of myco degradation products, such as biofuels, enzymes, and bioplastics, are reviewed. It also highlights the implications of myco degradation for waste management and sustainable development. Overall, myco degradation represents a promising technology for the efficient deprivation of lignocellulosic waste biomass, and further research in this field holds great potential for the sustainable creation of bio‐based products.This article is protected by copyright. All rights reserved.
{"title":"Utilizing Fungal Biodegradation for Valorisation of Lignocellulosic Waste Biomass and Its Diverse Applications","authors":"Prerna Mehta, Dinesh Kumar Chelike","doi":"10.1002/appl.202300119","DOIUrl":"https://doi.org/10.1002/appl.202300119","url":null,"abstract":"Myco degradation is an effective technique for breaking down waste plant substances made of lignin, cellulose, and hemicellulose, which are collectively known as lignocellulose. This abundant organic material is found throughout the world. Due to its recalcitrant nature, lignocellulose poses a challenge for efficient conversion into biofuels, biochemicals, and other valuable products. Myco degradation, which involves the use of fungi to degrade lignocellulosic materials, offers a sustainable and cost‐efficient resolution to this challenge. This review provides an overview of the mechanisms and applications of myco degradation for lignocellulosic biomass degradation. The review discusses the various types of fungi involved in lignocellulose degradation, their enzymatic systems, and the factors that influences their performance. Furthermore, the potential applications of myco degradation products, such as biofuels, enzymes, and bioplastics, are reviewed. It also highlights the implications of myco degradation for waste management and sustainable development. Overall, myco degradation represents a promising technology for the efficient deprivation of lignocellulosic waste biomass, and further research in this field holds great potential for the sustainable creation of bio‐based products.This article is protected by copyright. All rights reserved.","PeriodicalId":503210,"journal":{"name":"Applied Research","volume":"57 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139841777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Eléonore Masarweh, Mariia Arseenko, Philippe Guaino, Denis Flandre
Measurements of the Young's modulus and residual stresses of screen‐printed ink layers using a bulge test on coated polyimide‐based membranes are proposed in this work. The applied bulge test monitors the deflection of membranes under pressure with interferometry. The obtained Young's modulus ranges from 6 to 8 GPa for a carbon blend based ink and is around 12 GPa for a silver nanoparticle ink. These values are compared with standard nanoindentation and show good agreement. Besides, the residual stresses range from ‐4 to 8 MPa for the carbon blend based ink, while the silver ink is measured around ‐10 MPa. The use of the membrane‐based method underlines the influence of exact deposition and curing conditions on the ink film material properties. The impact of the substrate on the ink layer properties, such as the thickness and its uniformity, is discussed, especially with regards to the heat treatment of the membrane.This article is protected by copyright. All rights reserved.
{"title":"Membrane‐based mechanical characterization of screen‐printed inks: deflection analysis of ink layers on polyimide membranes","authors":"Eléonore Masarweh, Mariia Arseenko, Philippe Guaino, Denis Flandre","doi":"10.1002/appl.202300113","DOIUrl":"https://doi.org/10.1002/appl.202300113","url":null,"abstract":"Measurements of the Young's modulus and residual stresses of screen‐printed ink layers using a bulge test on coated polyimide‐based membranes are proposed in this work. The applied bulge test monitors the deflection of membranes under pressure with interferometry. The obtained Young's modulus ranges from 6 to 8 GPa for a carbon blend based ink and is around 12 GPa for a silver nanoparticle ink. These values are compared with standard nanoindentation and show good agreement. Besides, the residual stresses range from ‐4 to 8 MPa for the carbon blend based ink, while the silver ink is measured around ‐10 MPa. The use of the membrane‐based method underlines the influence of exact deposition and curing conditions on the ink film material properties. The impact of the substrate on the ink layer properties, such as the thickness and its uniformity, is discussed, especially with regards to the heat treatment of the membrane.This article is protected by copyright. All rights reserved.","PeriodicalId":503210,"journal":{"name":"Applied Research","volume":"211 3-4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139847227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Joseph Odhiambo Aguk, Collins Kalwale Mweresa, M. Ayieko
Desert locusts (Schistocerca gregaria) pause a significant threat to food security. However, they also serve as a nutrient‐rich delicacy in many African and Arabic communities where they are traditionally harvested for food and feed. Traditional harvesting methods are inefficient, laborious and time‐consuming hence, the need to explore more convenient and efficient techniques. This study assessed preferential selection and feeding behavior of desert locusts to identify trap plants that could attract and aggregate them for easy harvesting. Four trap plants (cowpea, finger millet, sorghum, and amaranth) and four repellent plants (neem, pencil cactus, garlic, and cayenne red pepper) were evaluated through multiple‐choice experiments. A randomized complete block design (RCBD), mature adult, immature adult and hopper stages of desert locust were involved. ANOVA was used to determine effects of repellent and trap plants on feeding preferences of desert locusts. Mean differences between treatments at p<0.05 were separated using post‐hoc Tukey HSD. Cowpea as the most preferred trap plant attracted 62.7%, 70.7% and 76.9% of mature adult, immature adult and hopper locust stages, respectively. Neem exhibited the most potent repellent effect and attracted no desert locust for feeding. Neem repelled locusts thereby reducing infestation and damage of cowpea as a pull plant when both plants were grown in the same pot in a "push‐pull" system. The push‐pull attracted 3.7%, 24.3% and 7.8% of mature adult, immature adult and hopper locust stages, respectively. However, cowpea attracted large numbers of locusts (96.3% mature adults, 75.7% immature adults and 92.2% hoppers) when grown separately from neem. These findings provide valuable insights on the potential of exploiting trap and repellents to enhance aggregation and harvesting of desert locusts as food and feed.This article is protected by copyright. All rights reserved.
{"title":"Enhancing Attraction and Aggregation of Desert Locusts for Efficient Harvesting: Push‐Pull Approach","authors":"Joseph Odhiambo Aguk, Collins Kalwale Mweresa, M. Ayieko","doi":"10.1002/appl.202300108","DOIUrl":"https://doi.org/10.1002/appl.202300108","url":null,"abstract":"Desert locusts (Schistocerca gregaria) pause a significant threat to food security. However, they also serve as a nutrient‐rich delicacy in many African and Arabic communities where they are traditionally harvested for food and feed. Traditional harvesting methods are inefficient, laborious and time‐consuming hence, the need to explore more convenient and efficient techniques. This study assessed preferential selection and feeding behavior of desert locusts to identify trap plants that could attract and aggregate them for easy harvesting. Four trap plants (cowpea, finger millet, sorghum, and amaranth) and four repellent plants (neem, pencil cactus, garlic, and cayenne red pepper) were evaluated through multiple‐choice experiments. A randomized complete block design (RCBD), mature adult, immature adult and hopper stages of desert locust were involved. ANOVA was used to determine effects of repellent and trap plants on feeding preferences of desert locusts. Mean differences between treatments at p<0.05 were separated using post‐hoc Tukey HSD. Cowpea as the most preferred trap plant attracted 62.7%, 70.7% and 76.9% of mature adult, immature adult and hopper locust stages, respectively. Neem exhibited the most potent repellent effect and attracted no desert locust for feeding. Neem repelled locusts thereby reducing infestation and damage of cowpea as a pull plant when both plants were grown in the same pot in a \"push‐pull\" system. The push‐pull attracted 3.7%, 24.3% and 7.8% of mature adult, immature adult and hopper locust stages, respectively. However, cowpea attracted large numbers of locusts (96.3% mature adults, 75.7% immature adults and 92.2% hoppers) when grown separately from neem. These findings provide valuable insights on the potential of exploiting trap and repellents to enhance aggregation and harvesting of desert locusts as food and feed.This article is protected by copyright. All rights reserved.","PeriodicalId":503210,"journal":{"name":"Applied Research","volume":"44 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139856354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","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：