The photogalvanic effect of monolayer SnS was investigated at a small bias voltage under perpendicular irradiation using density functional theory combined with the non-equilibrium Green’s function method. The photocurrent was generated over the entire visible light range, and it was saturated at a small bias voltage for photon energies of 2.4, 2.6, 3.2 and 3.4 eV. The photocurrent shows cosine dependence of the polarization angle, which is attributed to the second-order response to the photoelectric field. These results provide a deeper understanding of the photogalvanic properties of the 2D SnS nanosheet based devices.
{"title":"First principles study of photogalvanic effect of monolayer SnS","authors":"Deyang Yu, Yangyang Hu, Ruiqi Ku, Guiling Zhang, Weiqi Li, YongYuan Jiang","doi":"10.1177/18479804221098299","DOIUrl":"https://doi.org/10.1177/18479804221098299","url":null,"abstract":"The photogalvanic effect of monolayer SnS was investigated at a small bias voltage under perpendicular irradiation using density functional theory combined with the non-equilibrium Green’s function method. The photocurrent was generated over the entire visible light range, and it was saturated at a small bias voltage for photon energies of 2.4, 2.6, 3.2 and 3.4 eV. The photocurrent shows cosine dependence of the polarization angle, which is attributed to the second-order response to the photoelectric field. These results provide a deeper understanding of the photogalvanic properties of the 2D SnS nanosheet based devices.","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":"44610614","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: 10.1177/18479804221132128
Yasna León-Gutiérrez, G. Cárdenas-Triviño
Monometallic and bimetallic Ni and Sn catalysts were prepared in different ratios by the Solvated Metal Atom Dispersed (SMAD) method for the catalytic hydrogenation of acetophenone to 1-phenylethanol. The preparation of the catalysts was carried out by evaporation of Ni and Sn metal atoms and subsequent co-deposition at 77 K using 2-isopropanol as solvent on alumina and magnesium oxide as supports. X-ray photoelectron spectroscopy (XPS) analysis showed a high percentage of nickel atoms in zero valence, while the tin phases were founded in reduced and oxidized form. The average size of the nanoparticles measured by transmission electron microscopy (TEM) ranged from 8 to 15 nm while the metal dispersion on the surface measured by hydrogen chemisorption ranged from 0.07% for Ni1% Sn0.3%/MgO to 3.2% for Ni5%/MgO. Thermogravimetric analysis shows that γ-Al2O3 catalysts exhibit higher thermal stability than MgO catalysts. The catalysis results showed that the best support is MgO reaching 66% conversion in Ni5% Sn0.5%/MgO catalyst.
{"title":"Catalyst characterization Ni-Sn nanoparticles supported in Al2O3 and MgO: Acetophenone hydrogenation","authors":"Yasna León-Gutiérrez, G. Cárdenas-Triviño","doi":"10.1177/18479804221132128","DOIUrl":"https://doi.org/10.1177/18479804221132128","url":null,"abstract":"Monometallic and bimetallic Ni and Sn catalysts were prepared in different ratios by the Solvated Metal Atom Dispersed (SMAD) method for the catalytic hydrogenation of acetophenone to 1-phenylethanol. The preparation of the catalysts was carried out by evaporation of Ni and Sn metal atoms and subsequent co-deposition at 77 K using 2-isopropanol as solvent on alumina and magnesium oxide as supports. X-ray photoelectron spectroscopy (XPS) analysis showed a high percentage of nickel atoms in zero valence, while the tin phases were founded in reduced and oxidized form. The average size of the nanoparticles measured by transmission electron microscopy (TEM) ranged from 8 to 15 nm while the metal dispersion on the surface measured by hydrogen chemisorption ranged from 0.07% for Ni1% Sn0.3%/MgO to 3.2% for Ni5%/MgO. Thermogravimetric analysis shows that γ-Al2O3 catalysts exhibit higher thermal stability than MgO catalysts. The catalysis results showed that the best support is MgO reaching 66% conversion in Ni5% Sn0.5%/MgO catalyst.","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":"44250911","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: 10.1177/18479804211064028
V. Adimule, V. Bhat, B. Yallur, Adarsha HJ Gowda, P. Padova, G. Hegde, A. Toghan
Perovskite bimetallic oxides as electrode material blends can be an appropriate method to enhance the supercapacitor properties. In the present research, SrO 0.5:MnO 0.5 nanostructures (NS) were synthesized by a facile co-precipitation method and calcinated at 750–800°C. Crystal structure of SrO 0.5:MnO 0.5 NS were characterized by X-ray diffraction, surface chemical composition and chemical bond analysis, and dispersion of SrO into MnO was confirmed by X-ray photoelectron spectral studies. Structural morphology was analyzed from scanning electron microscopy. Optical properties of SrO 0.5:MnO 0.5 NS were studied using UV-Visible spectrophotometer and SrO 0.5 and MnO 0.5 NS showed ∼75 nm grain, ∼ 64 nm grain boundary distance, with two maxima at 261 nm and 345 nm as intensity of absorption patterns, respectively. The synthesized SrO 0.5:MnO 0.5 NS exhibited high specific capacitance of 392.8 F/g at a current density of 0.1 A/g. Electrochemical impedance spectroscopy results indicated low resistance and very low time constant of 0.2 s ∼73% of the capacitance was retained after 1000 galvanostatic charge-discharge (GCD) cycles. These findings indicate that SrO 0.5:MnO 0.5 bimetallic oxide material could be a promising electrode material for electrochemical energy storage systems.
{"title":"Facile synthesis of novel SrO 0.5:MnO 0.5 bimetallic oxide nanostructure as a high-performance electrode material for supercapacitors","authors":"V. Adimule, V. Bhat, B. Yallur, Adarsha HJ Gowda, P. Padova, G. Hegde, A. Toghan","doi":"10.1177/18479804211064028","DOIUrl":"https://doi.org/10.1177/18479804211064028","url":null,"abstract":"Perovskite bimetallic oxides as electrode material blends can be an appropriate method to enhance the supercapacitor properties. In the present research, SrO 0.5:MnO 0.5 nanostructures (NS) were synthesized by a facile co-precipitation method and calcinated at 750–800°C. Crystal structure of SrO 0.5:MnO 0.5 NS were characterized by X-ray diffraction, surface chemical composition and chemical bond analysis, and dispersion of SrO into MnO was confirmed by X-ray photoelectron spectral studies. Structural morphology was analyzed from scanning electron microscopy. Optical properties of SrO 0.5:MnO 0.5 NS were studied using UV-Visible spectrophotometer and SrO 0.5 and MnO 0.5 NS showed ∼75 nm grain, ∼ 64 nm grain boundary distance, with two maxima at 261 nm and 345 nm as intensity of absorption patterns, respectively. The synthesized SrO 0.5:MnO 0.5 NS exhibited high specific capacitance of 392.8 F/g at a current density of 0.1 A/g. Electrochemical impedance spectroscopy results indicated low resistance and very low time constant of 0.2 s ∼73% of the capacitance was retained after 1000 galvanostatic charge-discharge (GCD) cycles. These findings indicate that SrO 0.5:MnO 0.5 bimetallic oxide material could be a promising electrode material for electrochemical energy storage systems.","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":"49411765","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: 10.1177/18479804221127307
Y. Suchikova, S. Kovachov, I. Bohdanov
We demonstrate how the formation of octahedral microcrystals of arsenic oxide As2O3 in the form of arsenolite with a size of 200 nm to 10 μm can be initiated by the electrochemical etching method with simultaneous deposition on the surface of substrates with n-GaAs (111). Crystallites were formed on a previously synthesized porous layer of GaAs. To explain the behavior of formation on the surface of the monocrystalline GaAs porous layer and As2O3 crystallites in the electrochemical reaction, we propose a qualitative model based on the decomposition of binary semiconductors in contact with electrolytes. Under this model, the crystallization of precipitated oxides occurs as a result of the transfer of ions to the crystal surface as a result of the electrolysis process. The formation of the composite structure takes place on the surface of the semiconductor and is characterized by the minimization of elastic energy. XRD analysis showed the formation of a complex compound of As2O3 and As0.172Sb0.570O1.113. The appearance of antimony is explained in terms of the formation of new centers when the As atom is replaced by an Sb doping atom in the crystal. Directed controlled oxidation technologies make it possible to synthesize a reliable passivating layer consisting of one type of oxide, namely As2O3 in the cubic phase of arsenolite. In addition, such structures can be used in photonics devices and as photocatalysts.
{"title":"Formation of oxide crystallites on the porous GaAs surface by electrochemical deposition","authors":"Y. Suchikova, S. Kovachov, I. Bohdanov","doi":"10.1177/18479804221127307","DOIUrl":"https://doi.org/10.1177/18479804221127307","url":null,"abstract":"We demonstrate how the formation of octahedral microcrystals of arsenic oxide As2O3 in the form of arsenolite with a size of 200 nm to 10 μm can be initiated by the electrochemical etching method with simultaneous deposition on the surface of substrates with n-GaAs (111). Crystallites were formed on a previously synthesized porous layer of GaAs. To explain the behavior of formation on the surface of the monocrystalline GaAs porous layer and As2O3 crystallites in the electrochemical reaction, we propose a qualitative model based on the decomposition of binary semiconductors in contact with electrolytes. Under this model, the crystallization of precipitated oxides occurs as a result of the transfer of ions to the crystal surface as a result of the electrolysis process. The formation of the composite structure takes place on the surface of the semiconductor and is characterized by the minimization of elastic energy. XRD analysis showed the formation of a complex compound of As2O3 and As0.172Sb0.570O1.113. The appearance of antimony is explained in terms of the formation of new centers when the As atom is replaced by an Sb doping atom in the crystal. Directed controlled oxidation technologies make it possible to synthesize a reliable passivating layer consisting of one type of oxide, namely As2O3 in the cubic phase of arsenolite. In addition, such structures can be used in photonics devices and as photocatalysts.","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":"47822107","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: 10.1177/18479804211056167
Purushothaman Rama, A. Baldelli, A. Vignesh, A. Altemimi, G. Lakshmanan, R. Selvam, N. Arunagirinathan, K. Murugesan, Anubhav Pratap-Singh
Murraya paniculata (MP) can be used as a reducing agent to produce silver nanoparticles (AgNPs) using a simple procedure. AgNPs are characterized in morphological and chemical properties, antioxidant activity, and cytotoxicity. The morphology of AgNPs derived from MP shows a face-centered cubic structure, spherical shape with an average particle size of 23 nm. The chemical structure shows characteristic peaks of AgNPs using UV-vis spectrometer at 438 nm. The formation of AgNPs is confirmed by analyzing their vibrational states under infrared radiation; typical peaks of AgNPs are recognized: at 3429 cm−1 (O-H stretch, H-bonded alcohols, phenols groups), 2923 cm−1 (C-H stretch alkanes), 1626 cm−1 (N-H bend 1° amines), 1583 cm−1 (C-C stretch in ring aromatic), 1039 cm−1 (C-N stretch aliphatic amines), 728 cm−1 (C-Cl stretch alkyl halides), and 589 cm−1 (C-Br stretch alkyl halides), respectively. AgNPs produced from MP show antioxidant activity and cytotoxicity. They show the highest sensitivity toward Bacillus cereus. Cytotoxicity of biosynthesized AgNPs, determined by scratch wound assay on in vitro human endothelial vein cell, created from MP showed dose-dependent activity. These AgNPs, at a concentration of 15.625 μg/mL, stimulate the proliferation and migration of endothelial cells (EC) showing an angiogenic activity.
{"title":"Antimicrobial, antioxidant, and angiogenic bioactive silver nanoparticles produced using Murraya paniculata (L.) jack leaves","authors":"Purushothaman Rama, A. Baldelli, A. Vignesh, A. Altemimi, G. Lakshmanan, R. Selvam, N. Arunagirinathan, K. Murugesan, Anubhav Pratap-Singh","doi":"10.1177/18479804211056167","DOIUrl":"https://doi.org/10.1177/18479804211056167","url":null,"abstract":"Murraya paniculata (MP) can be used as a reducing agent to produce silver nanoparticles (AgNPs) using a simple procedure. AgNPs are characterized in morphological and chemical properties, antioxidant activity, and cytotoxicity. The morphology of AgNPs derived from MP shows a face-centered cubic structure, spherical shape with an average particle size of 23 nm. The chemical structure shows characteristic peaks of AgNPs using UV-vis spectrometer at 438 nm. The formation of AgNPs is confirmed by analyzing their vibrational states under infrared radiation; typical peaks of AgNPs are recognized: at 3429 cm−1 (O-H stretch, H-bonded alcohols, phenols groups), 2923 cm−1 (C-H stretch alkanes), 1626 cm−1 (N-H bend 1° amines), 1583 cm−1 (C-C stretch in ring aromatic), 1039 cm−1 (C-N stretch aliphatic amines), 728 cm−1 (C-Cl stretch alkyl halides), and 589 cm−1 (C-Br stretch alkyl halides), respectively. AgNPs produced from MP show antioxidant activity and cytotoxicity. They show the highest sensitivity toward Bacillus cereus. Cytotoxicity of biosynthesized AgNPs, determined by scratch wound assay on in vitro human endothelial vein cell, created from MP showed dose-dependent activity. These AgNPs, at a concentration of 15.625 μg/mL, stimulate the proliferation and migration of endothelial cells (EC) showing an angiogenic activity.","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":"48926789","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: 10.1177/18479804221085103
Bowei Zhou, Yonglong Yan, Jingbo Xie, Hong-bo Huang, Heyun Wang, S. Gopinath, P. Anbu, Sanshan He, Lijun Zhang
An immunosensor was developed on an interdigitated electrode (IDE) by voltammetry sensing for the early identification of the autoimmune disease ‘rheumatoid arthritis (RA)’ by detecting the biomarker anti-cyclic citrullinated peptide antibody (anti-CCP). Higher immobilization of cyclic citrullinated peptide (CCP) as a probe was achieved by using green synthesized iron oxide nanoparticles (IONPs). Field-emission scanning electron microscopy and field-emission transmission electron microscopy observations revealed that the polydispersed material displayed multifaceted features. X-ray photoelectron spectroscopy analysis confirms the occurrence of Fe, O, and C groups on the synthesized IONPs. IONPs were immobilized with a probe on IDE through bifunctional aldehyde-amine linkers. Due to the elevated occupancy of CCP and the highly efficient electric transfer from IONPs, higher changes in current are observed upon binding of anti-CCP with CCP. In the linear range from 8 to 250 pg/mL, the sensitivity and detection limit of anti-CCP were 8 and 15 pg/mL, respectively, with a regression coefficient of y = 1E−06x−3E−07; R2 = 0.9637. Control experiments with nonimmune antibody and anti-carcinoembryonic antigen indicate the specific detection of anti-CCP. Furthermore, spiking of anti-CCP in human serum does not interfere, representing the specific detection of anti-CCP. This CCP-immobilized IDE through IONP helps to quantify anti-CCP levels in the biological fluid for diagnosing RA.
{"title":"Immunosensing the rheumatoid arthritis biomarker through bifunctional aldehyde-amine linkers on an iron oxide nanoparticle seeded voltammetry sensor","authors":"Bowei Zhou, Yonglong Yan, Jingbo Xie, Hong-bo Huang, Heyun Wang, S. Gopinath, P. Anbu, Sanshan He, Lijun Zhang","doi":"10.1177/18479804221085103","DOIUrl":"https://doi.org/10.1177/18479804221085103","url":null,"abstract":"An immunosensor was developed on an interdigitated electrode (IDE) by voltammetry sensing for the early identification of the autoimmune disease ‘rheumatoid arthritis (RA)’ by detecting the biomarker anti-cyclic citrullinated peptide antibody (anti-CCP). Higher immobilization of cyclic citrullinated peptide (CCP) as a probe was achieved by using green synthesized iron oxide nanoparticles (IONPs). Field-emission scanning electron microscopy and field-emission transmission electron microscopy observations revealed that the polydispersed material displayed multifaceted features. X-ray photoelectron spectroscopy analysis confirms the occurrence of Fe, O, and C groups on the synthesized IONPs. IONPs were immobilized with a probe on IDE through bifunctional aldehyde-amine linkers. Due to the elevated occupancy of CCP and the highly efficient electric transfer from IONPs, higher changes in current are observed upon binding of anti-CCP with CCP. In the linear range from 8 to 250 pg/mL, the sensitivity and detection limit of anti-CCP were 8 and 15 pg/mL, respectively, with a regression coefficient of y = 1E−06x−3E−07; R2 = 0.9637. Control experiments with nonimmune antibody and anti-carcinoembryonic antigen indicate the specific detection of anti-CCP. Furthermore, spiking of anti-CCP in human serum does not interfere, representing the specific detection of anti-CCP. This CCP-immobilized IDE through IONP helps to quantify anti-CCP levels in the biological fluid for diagnosing RA.","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":"45762595","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: 10.1177/18479804221132983
Cheol-Ju Shin, Seungwon Lee, Kwang Wook Choi, Young Hyun Hwang, Y. Park, B. Ju
In this study, we evaluated a nanoscale random rubbed structure (nRRS) used as a scattering layer in organic light-emitting diodes (OLEDs) through an innovative manufacturing method. The rubbing technique, which is conventionally utilized only for liquid crystal alignment, is a manufacturing process with excellent merit in that it can form nanoscale random corrugation in a large area without vacuum equipment even at room temperature, and it is simple and inexpensive. The optimized nRRS, fabricated via rubbing, exhibited a high transmittance of 97.8% and haze of 17.8%, making it suitable as a scattering layer for OLEDs. Owing to its random nature, the scattering effect occurred effectively by rearranging the waveguided light inside the glass substrate. The OLED combined with the optimized nRRS showed a 25.4% improvement in the external quantum efficiency. Additionally, the spectral distortion according to the viewing angle was alleviated, which was confirmed by the negligible difference in the International Commission on Illumination 1931 color space coordinates (∆(x, y) = (0.01, 0.013)). The optical performance of the nRRS–OLED was predicted through a finite-difference time-domain simulation and verified by showing results consistent with those of the fabricated device. This research is expected to be widely applied in many optical devices because it is possible to form a random corrugation on the outside of the device without the difficulty of simply fabricating a beneficial optical structure.
在这项研究中，我们通过一种创新的制造方法评估了用于有机发光二极管(oled)散射层的纳米级随机摩擦结构(nRRS)。摩擦技术是一种传统上仅用于液晶排列的制造工艺，其优点是即使在室温下也可以在不需要真空设备的情况下大面积形成纳米级无规波纹，而且工艺简单、成本低廉。通过摩擦法制备的nRRS具有97.8%的高透光率和17.8%的高雾度，适合作为oled的散射层。由于其随机性，将波导光重新排列在玻璃衬底内，可以有效地产生散射效应。结合优化后的nRRS, OLED的外量子效率提高了25.4%。此外，由于视角的不同，光谱畸变也得到了缓解，这一点可以通过国际照明委员会(International Commission on Illumination) 1931色彩空间坐标(∆(x, y) =(0.01, 0.013))的可忽略差异得到证实。通过时域有限差分仿真对nRRS-OLED的光学性能进行了预测，并与实际器件的光学性能进行了验证。该研究有望广泛应用于许多光学器件中，因为它可以在器件外部形成随机波纹，而无需简单地制造有益的光学结构。
{"title":"Enhancing the optical performance of organic light-emitting diodes using nanoscale random rubbed structure","authors":"Cheol-Ju Shin, Seungwon Lee, Kwang Wook Choi, Young Hyun Hwang, Y. Park, B. Ju","doi":"10.1177/18479804221132983","DOIUrl":"https://doi.org/10.1177/18479804221132983","url":null,"abstract":"In this study, we evaluated a nanoscale random rubbed structure (nRRS) used as a scattering layer in organic light-emitting diodes (OLEDs) through an innovative manufacturing method. The rubbing technique, which is conventionally utilized only for liquid crystal alignment, is a manufacturing process with excellent merit in that it can form nanoscale random corrugation in a large area without vacuum equipment even at room temperature, and it is simple and inexpensive. The optimized nRRS, fabricated via rubbing, exhibited a high transmittance of 97.8% and haze of 17.8%, making it suitable as a scattering layer for OLEDs. Owing to its random nature, the scattering effect occurred effectively by rearranging the waveguided light inside the glass substrate. The OLED combined with the optimized nRRS showed a 25.4% improvement in the external quantum efficiency. Additionally, the spectral distortion according to the viewing angle was alleviated, which was confirmed by the negligible difference in the International Commission on Illumination 1931 color space coordinates (∆(x, y) = (0.01, 0.013)). The optical performance of the nRRS–OLED was predicted through a finite-difference time-domain simulation and verified by showing results consistent with those of the fabricated device. This research is expected to be widely applied in many optical devices because it is possible to form a random corrugation on the outside of the device without the difficulty of simply fabricating a beneficial optical structure.","PeriodicalId":19018,"journal":{"name":"Nanomaterials and Nanotechnology","volume":"12 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41476511","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: 10.1177/18479804221079419
K. Nagpal, L. Rapenne, D. Wragg, E. Rauwel, P. Rauwel
We report on the controlled enhancement of the UV emission from ZnO nanoparticles synthesized via hydrothermal sol-gel routes. Various characterization techniques were used in this study to determine the crystal structure, defect formation, morphology and size of the ZnO nanoparticles. Firstly, the crystallinity of the ZnO nanoparticles was assessed by X-ray diffraction. The role of the precursor quantities on their morphology and bandgap states was investigated via transmission electron microscopy and photoluminescence spectroscopy, respectively. Subsequently, the impurity content and related bonds were evaluated by Fourier-transform infrared spectroscopy. In this work, the ZnO nanoparticles manifest a sharp UV emission along with a subdued green emission in the visible region. Conjoining ZnO with carbon nanotubes (CNT) suppressed the visible emission, as well as blueshifted and intensified the UV emission by ∼5-fold. These results suggest that CNT are effective in passivating the surface states of ZnO nanoparticles.
{"title":"The role of CNT in surface defect passivation and UV emission intensification of ZnO nanoparticles","authors":"K. Nagpal, L. Rapenne, D. Wragg, E. Rauwel, P. Rauwel","doi":"10.1177/18479804221079419","DOIUrl":"https://doi.org/10.1177/18479804221079419","url":null,"abstract":"We report on the controlled enhancement of the UV emission from ZnO nanoparticles synthesized via hydrothermal sol-gel routes. Various characterization techniques were used in this study to determine the crystal structure, defect formation, morphology and size of the ZnO nanoparticles. Firstly, the crystallinity of the ZnO nanoparticles was assessed by X-ray diffraction. The role of the precursor quantities on their morphology and bandgap states was investigated via transmission electron microscopy and photoluminescence spectroscopy, respectively. Subsequently, the impurity content and related bonds were evaluated by Fourier-transform infrared spectroscopy. In this work, the ZnO nanoparticles manifest a sharp UV emission along with a subdued green emission in the visible region. Conjoining ZnO with carbon nanotubes (CNT) suppressed the visible emission, as well as blueshifted and intensified the UV emission by ∼5-fold. These results suggest that CNT are effective in passivating the surface states of ZnO nanoparticles.","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":"43181849","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: 10.1177/18479804211048630
S. Akram, M. Athar, Khalid Saeed, Mir Yasir Umair
The effects of induced magnetic field, thermal and concentration convection on the peristaltic flow of Prandtl nanofluids are explored in this study in an inclined asymmetric channel. A detailed mathematical explanation is given for Prandtl nanofluids with double-diffusivity convection and induced magnetic field. To simplify non-linear partial differential equations, the long wavelength and low approximation of the Reynolds number are used. Using numerical technique, the non-linear differential equations are solved. Exact solutions of thermal and concentration are calculated. The impact of the various physical parameters of flow quantities is shown in graphical results.
{"title":"Nanomaterials effects on induced magnetic field and double-diffusivity convection on peristaltic transport of Prandtl nanofluids in inclined asymmetric channel","authors":"S. Akram, M. Athar, Khalid Saeed, Mir Yasir Umair","doi":"10.1177/18479804211048630","DOIUrl":"https://doi.org/10.1177/18479804211048630","url":null,"abstract":"The effects of induced magnetic field, thermal and concentration convection on the peristaltic flow of Prandtl nanofluids are explored in this study in an inclined asymmetric channel. A detailed mathematical explanation is given for Prandtl nanofluids with double-diffusivity convection and induced magnetic field. To simplify non-linear partial differential equations, the long wavelength and low approximation of the Reynolds number are used. Using numerical technique, the non-linear differential equations are solved. Exact solutions of thermal and concentration are calculated. The impact of the various physical parameters of flow quantities is shown in graphical results.","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":"48994669","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: 10.1177/18479804211062316
J. Macko, N. Podrojková, R. Oriňaková, A. Oriňak
This review deals with different aspects of hydrophobicity at nanostructured surfaces. Theoretical and geometric effects as well as those of surface feature geometry on hydrophobicity are explored in this article. This review includes surface modification methods used to change surface hydrophobicity and effect on adhesion of cells as nano substrate. A small chapter is devoted to hydrophobicity at self-assembled monolayers as a special type of nanostructured surface. To the different models describing hydrophobicity is devoted one up to dated chapter. Calculation methods including quantum, density functional theory, and molecular modeling bring novel perspectives to the study of hydrophobicity at nanostructured surfaces. Graphical Abstract
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