Pub Date : 2022-01-01DOI: 10.1177/18479804221079495
V. Sivamaran, V. Balasubramanian, M. Gopalakrishnan, V. Viswabaskaran, A. Gourav Rao, S. Selvamani
Research work published since 2010 on the synthesis of carbon nanotubes (CNTs), carbon nanorings (CNRs), and carbon nanospheres (CNSs) using the chemical vapor deposition (CVD) process is reviewed. The effect of CVD process parameters on carbon nanomaterials morphology, such as diameter, yield, and quality was reviewed. The mechanism of CVD formation and growth of carbon nanomaterials was reviewed in detail. The catalyst materials used to synthesize these carbon allotropies were discussed in detail. The formation mechanism of carbon nanomaterials indicates that the variables of the CVD process parameters that appear to control growth are not directly manipulated in the CVD process. Rather, it is determined by complex interactions between variables. The impact of CNTs, CNRs, and CNSs was discussed using the schematic representation. The researchers who published the articles in the CNTs, CNRs, and CNSs for the past decade were discussed. From the intensive literature review, it was found that as compared to CNTs there is not much research was undertaken in synthesizing spheres and rings. But spheres and rings are capable of performing better than CNTs structure in energy storage, and sensors.
{"title":"Carbon nanotubes, nanorings, and nanospheres: Synthesis and fabrication via chemical vapor deposition—a review","authors":"V. Sivamaran, V. Balasubramanian, M. Gopalakrishnan, V. Viswabaskaran, A. Gourav Rao, S. Selvamani","doi":"10.1177/18479804221079495","DOIUrl":"https://doi.org/10.1177/18479804221079495","url":null,"abstract":"Research work published since 2010 on the synthesis of carbon nanotubes (CNTs), carbon nanorings (CNRs), and carbon nanospheres (CNSs) using the chemical vapor deposition (CVD) process is reviewed. The effect of CVD process parameters on carbon nanomaterials morphology, such as diameter, yield, and quality was reviewed. The mechanism of CVD formation and growth of carbon nanomaterials was reviewed in detail. The catalyst materials used to synthesize these carbon allotropies were discussed in detail. The formation mechanism of carbon nanomaterials indicates that the variables of the CVD process parameters that appear to control growth are not directly manipulated in the CVD process. Rather, it is determined by complex interactions between variables. The impact of CNTs, CNRs, and CNSs was discussed using the schematic representation. The researchers who published the articles in the CNTs, CNRs, and CNSs for the past decade were discussed. From the intensive literature review, it was found that as compared to CNTs there is not much research was undertaken in synthesizing spheres and rings. But spheres and rings are capable of performing better than CNTs structure in energy storage, and sensors.","PeriodicalId":19018,"journal":{"name":"Nanomaterials and Nanotechnology","volume":" ","pages":""},"PeriodicalIF":3.7,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47112124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2022-01-01DOI: 10.1177/18479804221109058
A. A. Hamzah, J. Yunas
This Special Collection on Nanomaterials and Nanotechnology is devoted to the collection of articles from several different research fields and applications of nanotechnology which have been presented at the NanoMITe Annual Symposium and Nanotechnology Malaysia Annual Symposium (NanoSym2019) in Putrajaya during 21-22 August 2019. This Special Issue includes a selection of contributions among the papers presented at the Conference, with a peculiar emphasis on Energy, Wellness, Medical and Healthcare, Food and Agriculture and Electronics, Devices and Systems. All the published articles were peer-reviewed and selected on the base of technical novelty, scientific quality and impact in current trends of nanotechnology. Among several submissions, eleven quality papers have been selected covering the topics of nanophotonics, functional nanomaterials and application of nanotechnology in energy, biomedical and environmental fields. The purpose of publishing this special edition is twofold, firstly to promote interest in nanomaterials and nanotechnology, and secondly to convey the states of the art of the technological developments in these areas that would give a tremendous impact on the future technology, product development and on the academic society so as to encourage the increasing the research and development in nanotechnology. Here, we present a brief overview of each published article of the Special Collection and topics covered, as a guideline for the readers encouraging and stimulating the interest in reading the whole articles. Thanks to their wide direct bandgap tunability, III-nitride (III-N) compound semiconductors resulted fundamental in the development of blue light-emitting diodes that led to the so-called solid-state lighting revolution and blue laser diodes that are used for optical data storage. Beyond such conventional optoelectronic devices, 2D photonic crystal (PhC) cavities also cover an important role among the photonic devices. However, critical aspects related to their design and fabrication still need to be addressed. In this Special Collection, among the articles in the nanophotonics field, the article titled “Design of 2D GaN photonic crystal based on hole displacement for L3 cavity” by Nur Dalila Mohd Zamani et al. discusses about the 2D GaN Photonic Crystal that has the ability in controlling the propagation of light. The authors from university Kebangsaan Malaysia studied a 2D photonic crystal cavity side holes in GaN-AlN-
这份关于纳米材料和纳米技术的特别合集致力于收集来自几个不同研究领域和纳米技术应用的文章，这些文章已于2019年8月21日至22日在布城举行的NanoMITe年度研讨会和纳米技术马来西亚年度研讨会(NanoSym2019)上发表。本期特刊精选了会议上发表的论文，特别强调了能源、健康、医疗保健、食品和农业以及电子、设备和系统。所有发表的文章都经过同行评审，并根据技术新颖性、科学质量和对当前纳米技术趋势的影响进行了选择。在提交的论文中，选出了11篇高质量的论文，涵盖纳米光子学、功能纳米材料以及纳米技术在能源、生物医学和环境领域的应用。出版这个特别版的目的有两个，一是为了提高人们对纳米材料和纳米技术的兴趣，二是为了传达这些领域的技术发展的最新情况，这些技术发展将对未来的技术、产品发展和学术社会产生巨大的影响，从而鼓励纳米技术的研究和发展。在这里，我们对特辑的每一篇已发表的文章和所涉及的主题进行了简要的概述，以鼓励和激发读者阅读全文的兴趣。由于其宽的直接带隙可调性，iii -氮化物(III-N)化合物半导体对蓝色发光二极管的发展产生了根本性的影响，从而导致了所谓的固态照明革命和用于光学数据存储的蓝色激光二极管。除了这种传统的光电器件之外，二维光子晶体(PhC)腔在光子器件中也起着重要的作用。然而，与它们的设计和制造相关的关键方面仍然需要解决。在本特刊中，在纳米光子学领域的文章中，Nur Dalila Mohd Zamani等人的《基于L3腔空穴位移的二维GaN光子晶体设计》一文讨论了具有控制光传播能力的二维GaN光子晶体。马来西亚Kebangsaan大学的作者研究了GaN-AlN-的二维光子晶体腔侧孔
{"title":"NanoMITe Annual Symposium & Nanotechnology Malaysia Annual Symposium 2019","authors":"A. A. Hamzah, J. Yunas","doi":"10.1177/18479804221109058","DOIUrl":"https://doi.org/10.1177/18479804221109058","url":null,"abstract":"This Special Collection on Nanomaterials and Nanotechnology is devoted to the collection of articles from several different research fields and applications of nanotechnology which have been presented at the NanoMITe Annual Symposium and Nanotechnology Malaysia Annual Symposium (NanoSym2019) in Putrajaya during 21-22 August 2019. This Special Issue includes a selection of contributions among the papers presented at the Conference, with a peculiar emphasis on Energy, Wellness, Medical and Healthcare, Food and Agriculture and Electronics, Devices and Systems. All the published articles were peer-reviewed and selected on the base of technical novelty, scientific quality and impact in current trends of nanotechnology. Among several submissions, eleven quality papers have been selected covering the topics of nanophotonics, functional nanomaterials and application of nanotechnology in energy, biomedical and environmental fields. The purpose of publishing this special edition is twofold, firstly to promote interest in nanomaterials and nanotechnology, and secondly to convey the states of the art of the technological developments in these areas that would give a tremendous impact on the future technology, product development and on the academic society so as to encourage the increasing the research and development in nanotechnology. Here, we present a brief overview of each published article of the Special Collection and topics covered, as a guideline for the readers encouraging and stimulating the interest in reading the whole articles. Thanks to their wide direct bandgap tunability, III-nitride (III-N) compound semiconductors resulted fundamental in the development of blue light-emitting diodes that led to the so-called solid-state lighting revolution and blue laser diodes that are used for optical data storage. Beyond such conventional optoelectronic devices, 2D photonic crystal (PhC) cavities also cover an important role among the photonic devices. However, critical aspects related to their design and fabrication still need to be addressed. In this Special Collection, among the articles in the nanophotonics field, the article titled “Design of 2D GaN photonic crystal based on hole displacement for L3 cavity” by Nur Dalila Mohd Zamani et al. discusses about the 2D GaN Photonic Crystal that has the ability in controlling the propagation of light. The authors from university Kebangsaan Malaysia studied a 2D photonic crystal cavity side holes in GaN-AlN-","PeriodicalId":19018,"journal":{"name":"Nanomaterials and Nanotechnology","volume":" ","pages":""},"PeriodicalIF":3.7,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46601209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2022-01-01DOI: 10.1177/18479804221132965
Huanhuan Liang, Jiazheng Han, Xingai Yang, Zhixing Qiao, Tao Yin
In microbial fuel cell (MFC), the anode is the carrier of microbial attachment and growth, and its material and surface structure play a vital role in MFC electricity generation. Therefore, anode surface optimization is an effective way to improve MFC performance. Although the power generation of bacteria has been confirmed and studied as early as the beginning of the 20th century, up to now, MFC still has the extremely challenging problem of low current and low power output in practical application. To improve the performance of MFC, several strategies have been applied to enhance the bacterial extracellular electron transfer. One promising technology is the genetic engineering approach, and some outstanding research results have been obtained. Another effective strategy is to design and fabricate a high-performance electrode because anode material is the essential factor affecting MFC performance, which provides surface active sites for microbial adhesion, reproduction and interfacial electron transfer. At present, the MFC anodes mainly include carbon-based electrodes and a variety of metal electrodes, but untreated anodes have always been unable to overcome the obstacle of low power output. Anode modification, a common and effective method, is employed for improving the power output of MFC. For this reason, this review is primarily focused on the applications of various anode materials and its nanoscale modification in the field of MFC, including the influence of different anode materials on the power output of MFC, and analyzes the reasons why anode modification enhances output performance. Furthermore, the influence of anode research on the practical application of MFC in the future is prospected.
{"title":"Performance improvement of microbial fuel cells through assembling anodes modified with nanoscale materials","authors":"Huanhuan Liang, Jiazheng Han, Xingai Yang, Zhixing Qiao, Tao Yin","doi":"10.1177/18479804221132965","DOIUrl":"https://doi.org/10.1177/18479804221132965","url":null,"abstract":"In microbial fuel cell (MFC), the anode is the carrier of microbial attachment and growth, and its material and surface structure play a vital role in MFC electricity generation. Therefore, anode surface optimization is an effective way to improve MFC performance. Although the power generation of bacteria has been confirmed and studied as early as the beginning of the 20th century, up to now, MFC still has the extremely challenging problem of low current and low power output in practical application. To improve the performance of MFC, several strategies have been applied to enhance the bacterial extracellular electron transfer. One promising technology is the genetic engineering approach, and some outstanding research results have been obtained. Another effective strategy is to design and fabricate a high-performance electrode because anode material is the essential factor affecting MFC performance, which provides surface active sites for microbial adhesion, reproduction and interfacial electron transfer. At present, the MFC anodes mainly include carbon-based electrodes and a variety of metal electrodes, but untreated anodes have always been unable to overcome the obstacle of low power output. Anode modification, a common and effective method, is employed for improving the power output of MFC. For this reason, this review is primarily focused on the applications of various anode materials and its nanoscale modification in the field of MFC, including the influence of different anode materials on the power output of MFC, and analyzes the reasons why anode modification enhances output performance. Furthermore, the influence of anode research on the practical application of MFC in the future is prospected.","PeriodicalId":19018,"journal":{"name":"Nanomaterials and Nanotechnology","volume":" ","pages":""},"PeriodicalIF":3.7,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47594156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2022-01-01DOI: 10.1177/18479804221141266
H. A. Abd El-Moaty, E. H. Ismail, R. Abu-Khudir, N. Soliman, D. Sabry, N. K. Al Abdulsalam, W. Sorour, M. Khalil
Novel metallic nanoparticles (NPs), such as biosynthesized gold nanoparticles (AuNPs), have been extensively studied because of their wide applications. Consequently, the present investigation aimed at the biosynthesis, characterization, and comparative assessment of biological activities of AuNPs. Biosynthesized AuNPs (ED-AuNPs) were synthesized using aqueous extract of Euphorbia dendroides (E. dendroides) aerial parts (EDAE), which functions as a reducing and stabilizing agent by its nature. Presence of tannins, saponins, flavonoids, alkaloids, glycosides/or carbohydrates, steroids, and terpenes was revealed by the qualitative phytochemical analysis of EDAE. Characterization of the biosynthesized AuNPs was attained by UV-Visible spectrophotometry, transmission electron microscopy (TEM), XRD, and Fourier transform infrared (FTIR). The cytotoxic effects of ED-AuNPs and EDAE were assessed in vitro against HepG2 and HCT-116 cancer cells. The MTT assay revealed a significant cytotoxic effect of ED-AuNPs and EDAE on HepG2 (IC50 = 41.72 ± 1.26 and 55.26 ± 2.25 μg mL−1) as well as HCT-116 (IC50 = 44.96 ± 3.23 and 69.83 ± 0.96 μg mL−1) cells, thus indicating their potential anticancer activity. Furthermore, ED-AuNPs exhibited potent anti-diabetic activity, with an IC50 value of 19.8 ± 1.97 µg mL−1, pointing to their plausible use as therapeutics in the treatment of diabetes, as well as a promising antimicrobial activity against H. pylori.
新型金属纳米粒子(NPs)，如生物合成金纳米粒子(AuNPs)，因其广泛的应用而受到广泛的研究。因此，本研究旨在研究AuNPs的生物合成、表征和生物活性的比较评估。生物合成AuNPs (ED-AuNPs)以大戟(Euphorbia dendroides, E. dendroides)气相部位(EDAE)的水提物为原料合成，具有还原性和稳定性作用。通过对EDAE的定性植物化学分析，发现其含有单宁、皂苷、黄酮类、生物碱、糖苷/或碳水化合物、类固醇和萜烯。通过紫外可见分光光度法、透射电镜(TEM)、x射线衍射(XRD)和傅里叶变换红外(FTIR)对生物合成的AuNPs进行了表征。体外评估ED-AuNPs和EDAE对HepG2和HCT-116癌细胞的细胞毒作用。MTT实验显示ED-AuNPs和EDAE对HepG2细胞(IC50分别为41.72±1.26和55.26±2.25 μg mL−1)和HCT-116细胞(IC50分别为44.96±3.23和69.83±0.96 μg mL−1)具有显著的细胞毒作用，提示其具有潜在的抗癌活性。此外，ED-AuNPs显示出强大的抗糖尿病活性，IC50值为19.8±1.97µg mL−1，表明它们可能用于糖尿病的治疗，以及对幽门螺旋杆菌的抗菌活性。
{"title":"Characterization and evaluation of multiple biological activities of phytosynthesized gold nanoparticles using aqueous extract of Euphorbia dendroides","authors":"H. A. Abd El-Moaty, E. H. Ismail, R. Abu-Khudir, N. Soliman, D. Sabry, N. K. Al Abdulsalam, W. Sorour, M. Khalil","doi":"10.1177/18479804221141266","DOIUrl":"https://doi.org/10.1177/18479804221141266","url":null,"abstract":"Novel metallic nanoparticles (NPs), such as biosynthesized gold nanoparticles (AuNPs), have been extensively studied because of their wide applications. Consequently, the present investigation aimed at the biosynthesis, characterization, and comparative assessment of biological activities of AuNPs. Biosynthesized AuNPs (ED-AuNPs) were synthesized using aqueous extract of Euphorbia dendroides (E. dendroides) aerial parts (EDAE), which functions as a reducing and stabilizing agent by its nature. Presence of tannins, saponins, flavonoids, alkaloids, glycosides/or carbohydrates, steroids, and terpenes was revealed by the qualitative phytochemical analysis of EDAE. Characterization of the biosynthesized AuNPs was attained by UV-Visible spectrophotometry, transmission electron microscopy (TEM), XRD, and Fourier transform infrared (FTIR). The cytotoxic effects of ED-AuNPs and EDAE were assessed in vitro against HepG2 and HCT-116 cancer cells. The MTT assay revealed a significant cytotoxic effect of ED-AuNPs and EDAE on HepG2 (IC50 = 41.72 ± 1.26 and 55.26 ± 2.25 μg mL−1) as well as HCT-116 (IC50 = 44.96 ± 3.23 and 69.83 ± 0.96 μg mL−1) cells, thus indicating their potential anticancer activity. Furthermore, ED-AuNPs exhibited potent anti-diabetic activity, with an IC50 value of 19.8 ± 1.97 µg mL−1, pointing to their plausible use as therapeutics in the treatment of diabetes, as well as a promising antimicrobial activity against H. pylori.","PeriodicalId":19018,"journal":{"name":"Nanomaterials and Nanotechnology","volume":" ","pages":""},"PeriodicalIF":3.7,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46936031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2021-03-05DOI: 10.1177/18479804221085790
S. Vichi, S. Bietti, F. B. Basset, A. Tuktamyshev, A. Fedorov, S. Sanguinetti
We present the design for a novel type of dual-band photodetector in the thermal infrared spectral range, the Optically Controlled Dual-band quantum dot Infrared Photodetector (OCDIP). This concept is based on a quantum dot ensemble with a unimodal size distribution, whose absorption spectrum can be controlled by optically injected carriers. An external pumping laser varies the electron density in the QDs, permitting to control the available electronic transitions and thus the absorption spectrum. We grew a test sample which we studied by AFM and photoluminescence. Based on the experimental data, we simulated the infrared absorption spectrum of the sample, which showed two absorption bands at 5.85 μm and 8.98 μm depending on the excitation power.
{"title":"Optically controlled dual-band quantum dot infrared photodetector","authors":"S. Vichi, S. Bietti, F. B. Basset, A. Tuktamyshev, A. Fedorov, S. Sanguinetti","doi":"10.1177/18479804221085790","DOIUrl":"https://doi.org/10.1177/18479804221085790","url":null,"abstract":"We present the design for a novel type of dual-band photodetector in the thermal infrared spectral range, the Optically Controlled Dual-band quantum dot Infrared Photodetector (OCDIP). This concept is based on a quantum dot ensemble with a unimodal size distribution, whose absorption spectrum can be controlled by optically injected carriers. An external pumping laser varies the electron density in the QDs, permitting to control the available electronic transitions and thus the absorption spectrum. We grew a test sample which we studied by AFM and photoluminescence. Based on the experimental data, we simulated the infrared absorption spectrum of the sample, which showed two absorption bands at 5.85 μm and 8.98 μm depending on the excitation power.","PeriodicalId":19018,"journal":{"name":"Nanomaterials and Nanotechnology","volume":"12 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2021-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46676055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2021-01-01DOI: 10.1177/1847980420987774
U. K. N. Din, M. Salleh, T. Aziz, A. M. Md Zain, M. A. Mohamed, A. Umar
This study reports the performances of a single structured light-emitting diode (LED) devices based on polymer material poly(9,9-di-n-hexylfluorenyl-2,7-diyl) (PHF) mixed with various concentrations of perovskite oxide strontium titanate (SrTiO3) particles deposited as a composite PHF: SrTiO3 emitting layer. The performances of the single structured organic LED indium tin oxide (ITO)/PHF/aluminum (Al) device and the composite LED ITO/PHF: SrTiO3/Al devices were compared in terms of turn-on voltage and luminance intensity. By incorporating perovskite SrTiO3 particles into PHF emitting layer, the turn-on voltage of the device is significantly reduced from 11.25 V to 1.80 V and the luminance intensity increased from 57.7 cd/m2 to 609 cd/m2. The improvement of turn-on voltage and the electroluminescence spectrum of the composite devices were found to be dependent on the weight ratios of SrTiO3 content in the PHF emitting layer.
{"title":"On the performance of polymer-inorganic perovskite oxide composite light-emitting diodes: The effect of perovskite SrTiO3 additives","authors":"U. K. N. Din, M. Salleh, T. Aziz, A. M. Md Zain, M. A. Mohamed, A. Umar","doi":"10.1177/1847980420987774","DOIUrl":"https://doi.org/10.1177/1847980420987774","url":null,"abstract":"This study reports the performances of a single structured light-emitting diode (LED) devices based on polymer material poly(9,9-di-n-hexylfluorenyl-2,7-diyl) (PHF) mixed with various concentrations of perovskite oxide strontium titanate (SrTiO3) particles deposited as a composite PHF: SrTiO3 emitting layer. The performances of the single structured organic LED indium tin oxide (ITO)/PHF/aluminum (Al) device and the composite LED ITO/PHF: SrTiO3/Al devices were compared in terms of turn-on voltage and luminance intensity. By incorporating perovskite SrTiO3 particles into PHF emitting layer, the turn-on voltage of the device is significantly reduced from 11.25 V to 1.80 V and the luminance intensity increased from 57.7 cd/m2 to 609 cd/m2. The improvement of turn-on voltage and the electroluminescence spectrum of the composite devices were found to be dependent on the weight ratios of SrTiO3 content in the PHF emitting layer.","PeriodicalId":19018,"journal":{"name":"Nanomaterials and Nanotechnology","volume":" ","pages":""},"PeriodicalIF":3.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/1847980420987774","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46286450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2021-01-01DOI: 10.1177/1847980420981537
M. H. Johari, Mohamad Shukri Sirat, M. A. Mohamed, Y. Wakayama, A. Mohmad
Multi-step chemical vapor deposition (CVD) is a synthesis method which is capable of producing a uniform, large area, and high-quality thin films. In this work, we report the effect of post-annealing on the structural and optical properties of few-layers (FL) MoS2 thin films synthesized by multi-step CVD. Based on atomic force microscopic image, the thickness of the MoS2 thin film is ∼3 nm, which is equivalent to five layers. After annealing at 900°C for 17 min, intensity of the A1g and E 2 g 1 Raman modes increased by ∼3 times while the full-width-at-half-maximum (FWHM)* reduced from ∼10 cm−1 to ∼7.5 cm−1 for A1g and from ∼13.6 cm−1 to ∼7.5 cm−1 for E 2 g 1 . Both of the as-grown and annealed samples showed X-ray (002) diffraction peak at 14.2° but the intensity was more prominent for the annealed sample. It was found that the annealed sample showed clear and distinct absorbance peaks at 666, 615, 448, 401, and 278 nm which correspond to the A, B, C, D, and E excitons, respectively. The results indicate that annealing significantly improved the optical and structural quality of the MoS2 film. Field-effect transistor based on annealed MoS2 thin film was fabricated and showed electron mobility of 0.21 cm2V−1s−1, on/off ratio of 1.3 × 102 and a threshold voltage of 0.72 V. Our work highlights the importance of high-temperature annealing in multi-step CVD to obtain a uniform and high-quality FL MoS2 thin films.
{"title":"Effects of post-annealing on MoS2 thin films synthesized by multi-step chemical vapor deposition","authors":"M. H. Johari, Mohamad Shukri Sirat, M. A. Mohamed, Y. Wakayama, A. Mohmad","doi":"10.1177/1847980420981537","DOIUrl":"https://doi.org/10.1177/1847980420981537","url":null,"abstract":"Multi-step chemical vapor deposition (CVD) is a synthesis method which is capable of producing a uniform, large area, and high-quality thin films. In this work, we report the effect of post-annealing on the structural and optical properties of few-layers (FL) MoS2 thin films synthesized by multi-step CVD. Based on atomic force microscopic image, the thickness of the MoS2 thin film is ∼3 nm, which is equivalent to five layers. After annealing at 900°C for 17 min, intensity of the A1g and E 2 g 1 Raman modes increased by ∼3 times while the full-width-at-half-maximum (FWHM)* reduced from ∼10 cm−1 to ∼7.5 cm−1 for A1g and from ∼13.6 cm−1 to ∼7.5 cm−1 for E 2 g 1 . Both of the as-grown and annealed samples showed X-ray (002) diffraction peak at 14.2° but the intensity was more prominent for the annealed sample. It was found that the annealed sample showed clear and distinct absorbance peaks at 666, 615, 448, 401, and 278 nm which correspond to the A, B, C, D, and E excitons, respectively. The results indicate that annealing significantly improved the optical and structural quality of the MoS2 film. Field-effect transistor based on annealed MoS2 thin film was fabricated and showed electron mobility of 0.21 cm2V−1s−1, on/off ratio of 1.3 × 102 and a threshold voltage of 0.72 V. Our work highlights the importance of high-temperature annealing in multi-step CVD to obtain a uniform and high-quality FL MoS2 thin films.","PeriodicalId":19018,"journal":{"name":"Nanomaterials and Nanotechnology","volume":" ","pages":""},"PeriodicalIF":3.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/1847980420981537","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44187054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2021-01-01DOI: 10.1007/978-981-33-6056-3_12
T. B. A. R. Miguel, S. Pinheiro, E. Miguel
{"title":"Interaction of Nanomaterials with Biological Systems","authors":"T. B. A. R. Miguel, S. Pinheiro, E. Miguel","doi":"10.1007/978-981-33-6056-3_12","DOIUrl":"https://doi.org/10.1007/978-981-33-6056-3_12","url":null,"abstract":"","PeriodicalId":19018,"journal":{"name":"Nanomaterials and Nanotechnology","volume":"1 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51132447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2021-01-01DOI: 10.1177/18479804211032851
H. A. Permatasari, M. Sari, Aminatun, T. Suciati, K. Dahlan, Y. Yusuf
In this study, nano-carbonated hydroxyapatite (n-CHAp) was successfully synthesized with abalone shells (Halioitis asinina) as the calcium source using precipitation methods with aging time variations, namely, 0 (without the aging process), 24, and 48 h. Based on an analysis of X-ray diffraction characterization, the spectrum of the n-CHAp is shown for all sample variations in aging time. The results of the calculation of lattice parameter values confirm that the phase formed is the B-type CHAp phase with the increasing crystallinity degree, crystallite size, particle size, and polydispersity which is confirmed by the presence of the CO32- functional group at 1438 cm−1 and 878 cm−1, that is, the B-type carbonate substitution characteristic. The presence of the carbonate ions identified as smaller during the extension of aging time causes the decreasing value of the Ca/P mole ratio but still has a value greater than the HAp Ca/P value (1.67), which is 1.80–1.72. Based on the transmission electron microscopy analysis, the nanometer-size of B-type CHAp particles was successfully obtained. According to the criteria for nanostructures, crystallographic properties, carbonate content, and chemical processes, B-type CHAp samples based on abalone shells (Halioitis asinina) are one of the candidates in bioceramics for bone tissue engineering applications.
{"title":"Nano-carbonated hydroxyapatite precipitation from abalone shell (Haliotis asinina) waste as the bioceramics candidate for bone tissue engineering","authors":"H. A. Permatasari, M. Sari, Aminatun, T. Suciati, K. Dahlan, Y. Yusuf","doi":"10.1177/18479804211032851","DOIUrl":"https://doi.org/10.1177/18479804211032851","url":null,"abstract":"In this study, nano-carbonated hydroxyapatite (n-CHAp) was successfully synthesized with abalone shells (Halioitis asinina) as the calcium source using precipitation methods with aging time variations, namely, 0 (without the aging process), 24, and 48 h. Based on an analysis of X-ray diffraction characterization, the spectrum of the n-CHAp is shown for all sample variations in aging time. The results of the calculation of lattice parameter values confirm that the phase formed is the B-type CHAp phase with the increasing crystallinity degree, crystallite size, particle size, and polydispersity which is confirmed by the presence of the CO32- functional group at 1438 cm−1 and 878 cm−1, that is, the B-type carbonate substitution characteristic. The presence of the carbonate ions identified as smaller during the extension of aging time causes the decreasing value of the Ca/P mole ratio but still has a value greater than the HAp Ca/P value (1.67), which is 1.80–1.72. Based on the transmission electron microscopy analysis, the nanometer-size of B-type CHAp particles was successfully obtained. According to the criteria for nanostructures, crystallographic properties, carbonate content, and chemical processes, B-type CHAp samples based on abalone shells (Halioitis asinina) are one of the candidates in bioceramics for bone tissue engineering applications.","PeriodicalId":19018,"journal":{"name":"Nanomaterials and Nanotechnology","volume":" ","pages":""},"PeriodicalIF":3.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46998462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 : 2021-01-01DOI: 10.1177/18479804211011384
Xingyao Liu, R. Guo, Zhiwei Lin, Yang Yang, H. Xia, Zhengwei Yao
In this article, multiwalled carbon nanotube/natural rubber composites with resistance-strain sensitivity were prepared by solution method, when the electrical percolation threshold of multiwalled carbon nanotube is only ∼3.5 wt%. The mechanical properties and resistance-strain response sensitivity were studied and analyzed systematically. The dispersion of multiwalled carbon nanotubes in the natural rubber matrix was characterized by field-emission scanning electron microscope and X-ray diffractometer. The composite exhibits good deformation sensitivity (gauge factor >27), large strain sensing range (>200%), and high signal stability when multiwalled carbon nanotube content was appropriate. The composite is suited to application in strain monitoring of large deformation structures since the resistance-strain response is more stable when strain exceeds 100%. To understand the mechanism of the resistance-strain response, the ‘shoulder peak’ of resistance-strain curve was researched and explained by the digital image correlation method, and an analytical model was developed when considering the effects of electronic tunneling and hopping in multiwalled carbon nanotube networks. Both experiment and analytical results confirm the break-restructure process of multiwalled carbon nanotube networks under applied strain cause the resistance-strain response. Finally, the practical application of the composite to monitoring strain load of rubber isolation bearing was realized.
{"title":"Resistance-strain sensitive rubber composites filled by multiwalled carbon nanotubes for structuraldeformation monitoring","authors":"Xingyao Liu, R. Guo, Zhiwei Lin, Yang Yang, H. Xia, Zhengwei Yao","doi":"10.1177/18479804211011384","DOIUrl":"https://doi.org/10.1177/18479804211011384","url":null,"abstract":"In this article, multiwalled carbon nanotube/natural rubber composites with resistance-strain sensitivity were prepared by solution method, when the electrical percolation threshold of multiwalled carbon nanotube is only ∼3.5 wt%. The mechanical properties and resistance-strain response sensitivity were studied and analyzed systematically. The dispersion of multiwalled carbon nanotubes in the natural rubber matrix was characterized by field-emission scanning electron microscope and X-ray diffractometer. The composite exhibits good deformation sensitivity (gauge factor >27), large strain sensing range (>200%), and high signal stability when multiwalled carbon nanotube content was appropriate. The composite is suited to application in strain monitoring of large deformation structures since the resistance-strain response is more stable when strain exceeds 100%. To understand the mechanism of the resistance-strain response, the ‘shoulder peak’ of resistance-strain curve was researched and explained by the digital image correlation method, and an analytical model was developed when considering the effects of electronic tunneling and hopping in multiwalled carbon nanotube networks. Both experiment and analytical results confirm the break-restructure process of multiwalled carbon nanotube networks under applied strain cause the resistance-strain response. Finally, the practical application of the composite to monitoring strain load of rubber isolation bearing was realized.","PeriodicalId":19018,"journal":{"name":"Nanomaterials and Nanotechnology","volume":" ","pages":""},"PeriodicalIF":3.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/18479804211011384","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46589056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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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