Pub Date : 2022-03-01DOI: 10.5185/amlett.2022.011688
C. Strobel, C. Chavarin, S. Leszczynski, K. Richter, M. Knaut, J. Reif, Sandra Voelkel, M. Albert, C. Wenger, J. Bartha, T. Mikolajick
The graphene-base heterojunction transistor GBHT is an attractive device concept to reach THz operation frequencies. The novel transistor consists of two n-doped silicon layers with a graphene monolayer in between. Here we demonstrate improved device performance with current saturation in the transistor’s output characteristics. A clear modulation of the collector current by the applied graphene base voltage can be observed.
{"title":"Improved graphene-base heterojunction transistor with different collector semiconductors for high-frequency applications","authors":"C. Strobel, C. Chavarin, S. Leszczynski, K. Richter, M. Knaut, J. Reif, Sandra Voelkel, M. Albert, C. Wenger, J. Bartha, T. Mikolajick","doi":"10.5185/amlett.2022.011688","DOIUrl":"https://doi.org/10.5185/amlett.2022.011688","url":null,"abstract":"The graphene-base heterojunction transistor GBHT is an attractive device concept to reach THz operation frequencies. The novel transistor consists of two n-doped silicon layers with a graphene monolayer in between. Here we demonstrate improved device performance with current saturation in the transistor’s output characteristics. A clear modulation of the collector current by the applied graphene base voltage can be observed.","PeriodicalId":7281,"journal":{"name":"Advanced Materials Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86899056","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}
Pub Date : 2022-02-14DOI: 10.5185/aml.2022.4167.1008
A. Shokrollahi, S. Hessampour
{"title":"Spectrophotometric Determination of Curcumin after Preconcentration by Ultrasonic Assisted Supramolecular Dispersive Liquid-liquid Microextraction based on Solidification of Floating Organic Drops using Taguchi Design Method","authors":"A. Shokrollahi, S. Hessampour","doi":"10.5185/aml.2022.4167.1008","DOIUrl":"https://doi.org/10.5185/aml.2022.4167.1008","url":null,"abstract":"","PeriodicalId":7281,"journal":{"name":"Advanced Materials Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80641219","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}
Pub Date : 2022-02-14DOI: 10.5185/aml.2022.4140.1002
Adhigan Murali, Saravanan Ashok Vallal, M. Sakar, R. Ramesh, M. Devendiran, N. Suthanthira Vanitha
{"title":"A Review on Green Polymer Binder-based Electrodes and Electrolytes for All Solid-State Li-ion batteries","authors":"Adhigan Murali, Saravanan Ashok Vallal, M. Sakar, R. Ramesh, M. Devendiran, N. Suthanthira Vanitha","doi":"10.5185/aml.2022.4140.1002","DOIUrl":"https://doi.org/10.5185/aml.2022.4140.1002","url":null,"abstract":"","PeriodicalId":7281,"journal":{"name":"Advanced Materials Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82447365","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}
Pub Date : 2022-01-18DOI: 10.5185/amlett.2021.111678
A. Aswar, N. Salunkhe, Chandrashekhar Arun Ladole, N. Thakare, J. Barabde
{"title":"A Simple and Convenient Synthesis of 2, 3-dihydroquinazolin-4(1H)-one Derivatives using MgFe2O4@SiO2-SO3H Catalyst","authors":"A. Aswar, N. Salunkhe, Chandrashekhar Arun Ladole, N. Thakare, J. Barabde","doi":"10.5185/amlett.2021.111678","DOIUrl":"https://doi.org/10.5185/amlett.2021.111678","url":null,"abstract":"","PeriodicalId":7281,"journal":{"name":"Advanced Materials Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82096812","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}
Pub Date : 2022-01-18DOI: 10.5185/amlett.2021.111677
Vikas J. Sawant, D. Lavate, A. Khomane
{"title":"Structural, Optical and Photo Catalytic Properties of CdS Thin Films Synthesized by Green-CBD Method","authors":"Vikas J. Sawant, D. Lavate, A. Khomane","doi":"10.5185/amlett.2021.111677","DOIUrl":"https://doi.org/10.5185/amlett.2021.111677","url":null,"abstract":"","PeriodicalId":7281,"journal":{"name":"Advanced Materials Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86569591","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}
Pub Date : 2022-01-18DOI: 10.5185/amlett.2021.111676
Rajani Malathi Alupatla, G. Kumar, G. Prasad
Perovskite ferroelectric materials exhibit electrocaloric effect (ECE) which is associated with entropy change in the material during application or removal of field. This electrocaloric effect is used for ferroelectric refrigeration. Commonly, the change of entropy between lowtemperature ferroelectric phase with ordered dipoles and high-temperature paraelectric phase without ordered dipoles is involved in ECE process and remarkable ECE always occurs near Curie temperature. The dipole-ordered state can be enhanced by decreasing temperature or enhancing applied electric field. Hence, the entropy drops and the ferroelectric material releases heat during application of field, while the entropy rises, and the material absorbs heat during withdrawal of field. Relaxor ferroelectrics could be attractive for ECE applications [1-4]. NBT is a promising candidate for ferroelectric and piezoelectric applications. It belongs to perovskite family. It undergoes various structural as well as phase transitions at different temperatures [5]. Compositional modifications in NBT results better properties. Addition of SrTiO3 to NBT shows better ferroelectric and piezoelectric properties [6]. Several authors have studied the electrocaloric effect on NBT based solid solutions. Yang Bai et. al., [7] reported abnormal electrocaloric effect of Na0.5Bi0.5TiO3–BaTiO3 lead-free ferroelectric ceramics above room temperature. Harberg et. al., [8] studied the electrocaloric effect in Na1/2Bi1/2TiO3-SrTiO3-PbTiO3 solid solutions. There are several applications for this technology, but the most intuitive application would be to cool computer chips and devices by employing refrigeration cycle [9]. In view of this, an effort has been made to investigate the PE loops, electrocaloric behavior, entropy change and relative cooling power of (1-x)Na0.5Bi0.5TiO3+(x) SrTiO3 (NBT-ST) where x = 0.075, 0.125, 0.150, 0.200 samples and results of such an investigation are presented in this paper.
{"title":"Electrocaloric Effect in Sodium Bismuth Titanate Based Ferroelectric Composites","authors":"Rajani Malathi Alupatla, G. Kumar, G. Prasad","doi":"10.5185/amlett.2021.111676","DOIUrl":"https://doi.org/10.5185/amlett.2021.111676","url":null,"abstract":"Perovskite ferroelectric materials exhibit electrocaloric effect (ECE) which is associated with entropy change in the material during application or removal of field. This electrocaloric effect is used for ferroelectric refrigeration. Commonly, the change of entropy between lowtemperature ferroelectric phase with ordered dipoles and high-temperature paraelectric phase without ordered dipoles is involved in ECE process and remarkable ECE always occurs near Curie temperature. The dipole-ordered state can be enhanced by decreasing temperature or enhancing applied electric field. Hence, the entropy drops and the ferroelectric material releases heat during application of field, while the entropy rises, and the material absorbs heat during withdrawal of field. Relaxor ferroelectrics could be attractive for ECE applications [1-4]. NBT is a promising candidate for ferroelectric and piezoelectric applications. It belongs to perovskite family. It undergoes various structural as well as phase transitions at different temperatures [5]. Compositional modifications in NBT results better properties. Addition of SrTiO3 to NBT shows better ferroelectric and piezoelectric properties [6]. Several authors have studied the electrocaloric effect on NBT based solid solutions. Yang Bai et. al., [7] reported abnormal electrocaloric effect of Na0.5Bi0.5TiO3–BaTiO3 lead-free ferroelectric ceramics above room temperature. Harberg et. al., [8] studied the electrocaloric effect in Na1/2Bi1/2TiO3-SrTiO3-PbTiO3 solid solutions. There are several applications for this technology, but the most intuitive application would be to cool computer chips and devices by employing refrigeration cycle [9]. In view of this, an effort has been made to investigate the PE loops, electrocaloric behavior, entropy change and relative cooling power of (1-x)Na0.5Bi0.5TiO3+(x) SrTiO3 (NBT-ST) where x = 0.075, 0.125, 0.150, 0.200 samples and results of such an investigation are presented in this paper.","PeriodicalId":7281,"journal":{"name":"Advanced Materials Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73957254","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}
{"title":"Synthesis, Characterization and Application of MCM-41@LDH as a New Support for Lysozyme: Central Composite Design to Evaluate Experimental Variables","authors":"F. Karami, A. Shokrollahi, Razie Razavizade","doi":"10.5185/aml.2021.15701","DOIUrl":"https://doi.org/10.5185/aml.2021.15701","url":null,"abstract":"","PeriodicalId":7281,"journal":{"name":"Advanced Materials Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91291647","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}
Hydrogen peroxide have strong oxidizing property hence widely used as oxidizing agent in various food production, organic compound synthesis, pulp & paper bleaching, sterilization, clinical application, pharmaceutical and environmental analysis [1-4]. H2O2 is by product of the most of the oxidative biological reactions which is most important factor of diseases like cancer, asthma, neurodegenerative disorder heart diseases [5-8] etc. Hence the detection and quantification of H2O2 was based on a simple credible, precise, fast & economical. Several methods have been developed for qualitative and quantitative detection of H2O2 such as titration [9], spectrophotometry [10], chemilumination [11], fluorometric [12] and chromatographic [13] techniques. But most of the methods have disadvantage like high cost, time consuming, and complexity while electrochemical methods have preferably low cost, high efficiency, sensitivity, selectivity [14] and reproducibility of electrode in operation. Recent studies on various polymer nanocomposites were used as electrochemical biosensor [15], drugs sensor [16,17], an environmental pollutant sensor [18], water and soil sample analysis [19], pharmaceutical and human fluids [20]. Several nanocomposites based modified electrode such as Pt Nanoparticle-Decorated rGO–CNT Nanocomposite [21], poly(azureA)-platinum nanoparticles [22], Co-embedded N-doped hierarchical carbon [23], AgAu / RGO / TiO2 nanocomposite [24], Co3O4 nanowall [25], novel metals [26-28] and conducting polymer nanocomposites [29,30] have been used for direct oxidation, reduction and detection of H2O2. In the present study chemically synthesized novel PPAP-WO3 nanocomposites (NCPs) for the electrochemical detection of H2O2 has newer approach. In the present observation we have adapted electrochemical detection of H2O2 by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and square wave voltammetry (SWV) techniques. The fabrication of an electrochemical sensor based on novel poly(pyrrole-co-3acetyl pyrrole)-WO3 nanocomposites modified gold electrode (PPAP-WO3-AuE) and its electrocatalytic oxidation and reduction of hydrogen peroxide is described here. The PPAP-WO3 nanocomposites were synthesized by chemical method and characterized by different techniques. The WO3 nanoparticles incorporated with PPAP were confirmed by x-ray diffraction pattern, scanning electron microscopy and transmission electron microscope micrograph. The electrochemical behaviour of PPAP-WO3-AuE towards the electro catalytic oxidation and reduction of hydrogen peroxide was investigated by cyclic voltammetry, differential pulse voltammetry and square wave voltammetry. The observed DPVs and SWVs response depend linearly on concentration of hydrogen peroxide in the range of 1-10 mM and with limit of detection (LOD) is 1×10 M. The correlation coefficients were found as 0.991, 0.930 and sensitivity observed was 47.64 A/mM.cm and 8.31A/mM.cm. These results indicate the PPAP-WO3-
{"title":"Novel Poly(pyrrole-co-3-acetyl pyrrole)-WO3 nanocomposites modified gold electrode as electrocatalytic oxidation and reduction of H2O2","authors":"N. Dighore, Priya Dahare, S. Gaikwad, A. Rajbhoj","doi":"10.5185/aml.2021.15703","DOIUrl":"https://doi.org/10.5185/aml.2021.15703","url":null,"abstract":"Hydrogen peroxide have strong oxidizing property hence widely used as oxidizing agent in various food production, organic compound synthesis, pulp & paper bleaching, sterilization, clinical application, pharmaceutical and environmental analysis [1-4]. H2O2 is by product of the most of the oxidative biological reactions which is most important factor of diseases like cancer, asthma, neurodegenerative disorder heart diseases [5-8] etc. Hence the detection and quantification of H2O2 was based on a simple credible, precise, fast & economical. Several methods have been developed for qualitative and quantitative detection of H2O2 such as titration [9], spectrophotometry [10], chemilumination [11], fluorometric [12] and chromatographic [13] techniques. But most of the methods have disadvantage like high cost, time consuming, and complexity while electrochemical methods have preferably low cost, high efficiency, sensitivity, selectivity [14] and reproducibility of electrode in operation. Recent studies on various polymer nanocomposites were used as electrochemical biosensor [15], drugs sensor [16,17], an environmental pollutant sensor [18], water and soil sample analysis [19], pharmaceutical and human fluids [20]. Several nanocomposites based modified electrode such as Pt Nanoparticle-Decorated rGO–CNT Nanocomposite [21], poly(azureA)-platinum nanoparticles [22], Co-embedded N-doped hierarchical carbon [23], AgAu / RGO / TiO2 nanocomposite [24], Co3O4 nanowall [25], novel metals [26-28] and conducting polymer nanocomposites [29,30] have been used for direct oxidation, reduction and detection of H2O2. In the present study chemically synthesized novel PPAP-WO3 nanocomposites (NCPs) for the electrochemical detection of H2O2 has newer approach. In the present observation we have adapted electrochemical detection of H2O2 by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and square wave voltammetry (SWV) techniques. The fabrication of an electrochemical sensor based on novel poly(pyrrole-co-3acetyl pyrrole)-WO3 nanocomposites modified gold electrode (PPAP-WO3-AuE) and its electrocatalytic oxidation and reduction of hydrogen peroxide is described here. The PPAP-WO3 nanocomposites were synthesized by chemical method and characterized by different techniques. The WO3 nanoparticles incorporated with PPAP were confirmed by x-ray diffraction pattern, scanning electron microscopy and transmission electron microscope micrograph. The electrochemical behaviour of PPAP-WO3-AuE towards the electro catalytic oxidation and reduction of hydrogen peroxide was investigated by cyclic voltammetry, differential pulse voltammetry and square wave voltammetry. The observed DPVs and SWVs response depend linearly on concentration of hydrogen peroxide in the range of 1-10 mM and with limit of detection (LOD) is 1×10 M. The correlation coefficients were found as 0.991, 0.930 and sensitivity observed was 47.64 A/mM.cm and 8.31A/mM.cm. These results indicate the PPAP-WO3-","PeriodicalId":7281,"journal":{"name":"Advanced Materials Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77012795","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}
{"title":"Theoretical Prediction for Band Gap of Semiconducting Nanoparticles","authors":"Sachin ., B. Pandey, Ratan Lal Jaiswal","doi":"10.5185/aml.2021.15700","DOIUrl":"https://doi.org/10.5185/aml.2021.15700","url":null,"abstract":"","PeriodicalId":7281,"journal":{"name":"Advanced Materials Letters","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80714151","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}
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