P. Elayarani, Thiyagarajan Sumathi, G. Sivakumar, Selvam Pragadeswaran, Selvakumar Suthakaran, Subbarayan Sathiyamurthy, Jayasree Seshadhri, Manikandan Ayyar, Markasagayam Visagamani Arularasu
The rational construction and design of nanostructured materials have a significant impact on the fabrication of high-performance electrode materials, which have attracted considerable interest in an effort to enhance the reliability and efficiency of energy storage devices. In this study, the α-ZnMoO4 nanoparticles were successfully prepared by facile hydrothermal method and the influence of various hydrothermal reaction times on structural, morphological, optical and electrochemical properties were studied. XRD analysis illustrated that α-ZnMoO4 nanoparticles exhibited anorthic crystal structure and the average crystallite size was 42 nm. FESEM images changed from a cubic structure to plate-like structures depending on reaction times. HRTEM analysis revealed that prepared sample showed a plate-like structure and the SAED pattern exhibited a polycrystalline nature. The FTIR spectrum confirmed the presence of vibrational molecules in α-ZnMoO4 nanoparticles. The BET and XPS measurements showed the α-ZnMoO4 nanoparticles were mesoporous and had Zn2+ and Mo6+ oxidation states, respectively. From UV–Visible spectra, a better spectral selectivity region was observed at higher reaction times, and the bandgap values were decreased from 2.73 to 2.48 eV. In photocatalytic studies, RhB dye was used as an organic pollutant and achieved a degradation efficiency of 85 % at an optimized reaction time of 24 h. For electrochemical performances, the prepared electrode material showed maximum specific capacitance values of 165 F g−1 and 110 F g−1 for cyclic voltammetry and galvanoststic charge-discharge analysis, respectively.
{"title":"Hydrothermal synthesis of zinc molybdates (α-ZnMoO4) nanoparticles and its applications of supercapacitor and photocatalytic performances","authors":"P. Elayarani, Thiyagarajan Sumathi, G. Sivakumar, Selvam Pragadeswaran, Selvakumar Suthakaran, Subbarayan Sathiyamurthy, Jayasree Seshadhri, Manikandan Ayyar, Markasagayam Visagamani Arularasu","doi":"10.1515/zpch-2023-0531","DOIUrl":"https://doi.org/10.1515/zpch-2023-0531","url":null,"abstract":"\u0000 The rational construction and design of nanostructured materials have a significant impact on the fabrication of high-performance electrode materials, which have attracted considerable interest in an effort to enhance the reliability and efficiency of energy storage devices. In this study, the α-ZnMoO4 nanoparticles were successfully prepared by facile hydrothermal method and the influence of various hydrothermal reaction times on structural, morphological, optical and electrochemical properties were studied. XRD analysis illustrated that α-ZnMoO4 nanoparticles exhibited anorthic crystal structure and the average crystallite size was 42 nm. FESEM images changed from a cubic structure to plate-like structures depending on reaction times. HRTEM analysis revealed that prepared sample showed a plate-like structure and the SAED pattern exhibited a polycrystalline nature. The FTIR spectrum confirmed the presence of vibrational molecules in α-ZnMoO4 nanoparticles. The BET and XPS measurements showed the α-ZnMoO4 nanoparticles were mesoporous and had Zn2+ and Mo6+ oxidation states, respectively. From UV–Visible spectra, a better spectral selectivity region was observed at higher reaction times, and the bandgap values were decreased from 2.73 to 2.48 eV. In photocatalytic studies, RhB dye was used as an organic pollutant and achieved a degradation efficiency of 85 % at an optimized reaction time of 24 h. For electrochemical performances, the prepared electrode material showed maximum specific capacitance values of 165 F g−1 and 110 F g−1 for cyclic voltammetry and galvanoststic charge-discharge analysis, respectively.","PeriodicalId":506520,"journal":{"name":"Zeitschrift für Physikalische Chemie","volume":"327 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139842792","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}
Surendhar Sakthivel, Sivaprakash Paramasivam, Periyasamy Velusamy, J. Jerries Infanta, Venkatesan Ragavendran, J. Mayandi, Sonachalam Arumugam, Ikhyun Kim
We investigated the role of dynamic shock waves in perovskite SrTiO3 (STO) material. XRD, FE-SEM, EDAX, FTIR, UV-DRS, XPS, and Raman spectroscopy were all used to examine the title material. When perovskite sample was loaded with shocks, its diffraction pattern did not show any crystal structure changes. The FE-SEM results suggest that the grain size increased linearly with the number of shocks. We used energy-dispersive X-ray spectroscopy to perform elemental analysis; results confirmed that SrTiO3 NPs were indeed present. Although the impulse of the shock wave changed the optical characteristics, it did not affect the molecular structure. To find the optical band gap energies of untreated and shocked NPs, Tauc plot relationships were used. The band-gap energies got smaller as the shock pulse became more substantial. The impact of shock waves caused oxygen vacancies and surface defects, lowering band gap energy. The test for photocatalytic testing showed that SrTiO3 NPs that are loaded with shock waves worked much better when they were exposed to visible light. The characteristics, including stress, strain, and bond length, were found to significantly influence photocatalytic applications. In addition, attempts were made to provide a viewpoint for future study. Overall, the objective of this research was to provide valuable insights for experts engaged in the field of SrTiO3.
{"title":"Experimental investigation of structural, morphological, and optical characteristics of SrTiO3 nanoparticles using a shock tube for photocatalytic applications","authors":"Surendhar Sakthivel, Sivaprakash Paramasivam, Periyasamy Velusamy, J. Jerries Infanta, Venkatesan Ragavendran, J. Mayandi, Sonachalam Arumugam, Ikhyun Kim","doi":"10.1515/zpch-2023-0486","DOIUrl":"https://doi.org/10.1515/zpch-2023-0486","url":null,"abstract":"\u0000 We investigated the role of dynamic shock waves in perovskite SrTiO3 (STO) material. XRD, FE-SEM, EDAX, FTIR, UV-DRS, XPS, and Raman spectroscopy were all used to examine the title material. When perovskite sample was loaded with shocks, its diffraction pattern did not show any crystal structure changes. The FE-SEM results suggest that the grain size increased linearly with the number of shocks. We used energy-dispersive X-ray spectroscopy to perform elemental analysis; results confirmed that SrTiO3 NPs were indeed present. Although the impulse of the shock wave changed the optical characteristics, it did not affect the molecular structure. To find the optical band gap energies of untreated and shocked NPs, Tauc plot relationships were used. The band-gap energies got smaller as the shock pulse became more substantial. The impact of shock waves caused oxygen vacancies and surface defects, lowering band gap energy. The test for photocatalytic testing showed that SrTiO3 NPs that are loaded with shock waves worked much better when they were exposed to visible light. The characteristics, including stress, strain, and bond length, were found to significantly influence photocatalytic applications. In addition, attempts were made to provide a viewpoint for future study. Overall, the objective of this research was to provide valuable insights for experts engaged in the field of SrTiO3.","PeriodicalId":506520,"journal":{"name":"Zeitschrift für Physikalische Chemie","volume":"185 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139848654","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}
Here we report the structural, optical and magnetic properties of La0.4Pr0.25Na x Sr0.35−x MnO3 (x = 0, 0.05, and 0.1) synthesized using ball milling method. After milling, the precursors are calcinated at 1,200 °C for 12 h. The phase purity, crystal structure, lattice parameter, and crystallite size of the samples were determined using X‐ray diffraction (XRD). The peaks from XRD provide the perovskite hexagonal structure with an R 3 ‾ $overline{3}$ c space group. Surface morphology shows the recreation of spherical structure to nanoflakes/layered structures. The ultraviolet-visible diffused reflectance spectroscopy (UV–vis DRS) study indicates that the decrease in the band gap is observed with the increase of Na content. The intensity of the luminescence peak decreases progressively with the increase of Na doping. The room temperature (RT) magnetization of the samples reveals weak ferromagnetism and shows a novel vertical shift in magnetization at room temperature.
我们在此报告采用球磨法合成的 La0.4Pr0.25Na x Sr0.35-x MnO3（x = 0、0.05 和 0.1）的结构、光学和磁学特性。研磨后，前驱体在 1,200 °C 煅烧 12 小时。利用 X 射线衍射 (XRD) 测定了样品的相纯度、晶体结构、晶格参数和晶粒大小。X 射线衍射的峰值为包晶六方结构，具有 R 3 ‾ $overline{3}$ c 空间群。表面形貌显示了球形结构到纳米片/层状结构的再现。紫外-可见扩散反射光谱（UV-vis DRS）研究表明，随着 Na 含量的增加，带隙有所减小。随着 Na 掺杂量的增加，发光峰的强度逐渐降低。样品的室温（RT）磁化显示出弱铁磁性，并在室温下出现了新的磁化垂直移动。
{"title":"Investigating the impact of sodium (Na) dopant on the structural, morphological, optical, and magnetic properties of LaPrSrMnO3 perovskite nanoflakes","authors":"Padmavathi Srinivasan, Jhelai Sahadevan, Esakki Muthu Sankaran, Ikhyun Kim, Viji Arangarasan, Sivaprakash Paramasivam","doi":"10.1515/zpch-2023-0490","DOIUrl":"https://doi.org/10.1515/zpch-2023-0490","url":null,"abstract":"\u0000 Here we report the structural, optical and magnetic properties of La0.4Pr0.25Na\u0000 x\u0000 Sr0.35−x\u0000 MnO3 (x = 0, 0.05, and 0.1) synthesized using ball milling method. After milling, the precursors are calcinated at 1,200 °C for 12 h. The phase purity, crystal structure, lattice parameter, and crystallite size of the samples were determined using X‐ray diffraction (XRD). The peaks from XRD provide the perovskite hexagonal structure with an R\u0000 \u0000 \u0000 \u0000 \u0000 \u0000 3\u0000 ‾\u0000 \u0000 \u0000 \u0000 $overline{3}$\u0000 \u0000 \u0000 \u0000 c space group. Surface morphology shows the recreation of spherical structure to nanoflakes/layered structures. The ultraviolet-visible diffused reflectance spectroscopy (UV–vis DRS) study indicates that the decrease in the band gap is observed with the increase of Na content. The intensity of the luminescence peak decreases progressively with the increase of Na doping. The room temperature (RT) magnetization of the samples reveals weak ferromagnetism and shows a novel vertical shift in magnetization at room temperature.","PeriodicalId":506520,"journal":{"name":"Zeitschrift für Physikalische Chemie","volume":"50 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139848455","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}
Here we report the structural, optical and magnetic properties of La0.4Pr0.25Na x Sr0.35−x MnO3 (x = 0, 0.05, and 0.1) synthesized using ball milling method. After milling, the precursors are calcinated at 1,200 °C for 12 h. The phase purity, crystal structure, lattice parameter, and crystallite size of the samples were determined using X‐ray diffraction (XRD). The peaks from XRD provide the perovskite hexagonal structure with an R 3 ‾ $overline{3}$ c space group. Surface morphology shows the recreation of spherical structure to nanoflakes/layered structures. The ultraviolet-visible diffused reflectance spectroscopy (UV–vis DRS) study indicates that the decrease in the band gap is observed with the increase of Na content. The intensity of the luminescence peak decreases progressively with the increase of Na doping. The room temperature (RT) magnetization of the samples reveals weak ferromagnetism and shows a novel vertical shift in magnetization at room temperature.
我们在此报告采用球磨法合成的 La0.4Pr0.25Na x Sr0.35-x MnO3（x = 0、0.05 和 0.1）的结构、光学和磁学特性。研磨后，前驱体在 1,200 °C 煅烧 12 小时。利用 X 射线衍射 (XRD) 测定了样品的相纯度、晶体结构、晶格参数和晶粒大小。X 射线衍射的峰值为包晶六方结构，具有 R 3 ‾ $overline{3}$ c 空间群。表面形貌显示了球形结构到纳米片/层状结构的再现。紫外-可见扩散反射光谱（UV-vis DRS）研究表明，随着 Na 含量的增加，带隙有所减小。随着 Na 掺杂量的增加，发光峰的强度逐渐降低。样品的室温（RT）磁化显示出弱铁磁性，并在室温下出现了新的磁化垂直移动。
{"title":"Investigating the impact of sodium (Na) dopant on the structural, morphological, optical, and magnetic properties of LaPrSrMnO3 perovskite nanoflakes","authors":"Padmavathi Srinivasan, Jhelai Sahadevan, Esakki Muthu Sankaran, Ikhyun Kim, Viji Arangarasan, Sivaprakash Paramasivam","doi":"10.1515/zpch-2023-0490","DOIUrl":"https://doi.org/10.1515/zpch-2023-0490","url":null,"abstract":"\u0000 Here we report the structural, optical and magnetic properties of La0.4Pr0.25Na\u0000 x\u0000 Sr0.35−x\u0000 MnO3 (x = 0, 0.05, and 0.1) synthesized using ball milling method. After milling, the precursors are calcinated at 1,200 °C for 12 h. The phase purity, crystal structure, lattice parameter, and crystallite size of the samples were determined using X‐ray diffraction (XRD). The peaks from XRD provide the perovskite hexagonal structure with an R\u0000 \u0000 \u0000 \u0000 \u0000 \u0000 3\u0000 ‾\u0000 \u0000 \u0000 \u0000 $overline{3}$\u0000 \u0000 \u0000 \u0000 c space group. Surface morphology shows the recreation of spherical structure to nanoflakes/layered structures. The ultraviolet-visible diffused reflectance spectroscopy (UV–vis DRS) study indicates that the decrease in the band gap is observed with the increase of Na content. The intensity of the luminescence peak decreases progressively with the increase of Na doping. The room temperature (RT) magnetization of the samples reveals weak ferromagnetism and shows a novel vertical shift in magnetization at room temperature.","PeriodicalId":506520,"journal":{"name":"Zeitschrift für Physikalische Chemie","volume":" 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139788607","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}
Surendhar Sakthivel, Sivaprakash Paramasivam, Periyasamy Velusamy, J. Jerries Infanta, Venkatesan Ragavendran, J. Mayandi, Sonachalam Arumugam, Ikhyun Kim
We investigated the role of dynamic shock waves in perovskite SrTiO3 (STO) material. XRD, FE-SEM, EDAX, FTIR, UV-DRS, XPS, and Raman spectroscopy were all used to examine the title material. When perovskite sample was loaded with shocks, its diffraction pattern did not show any crystal structure changes. The FE-SEM results suggest that the grain size increased linearly with the number of shocks. We used energy-dispersive X-ray spectroscopy to perform elemental analysis; results confirmed that SrTiO3 NPs were indeed present. Although the impulse of the shock wave changed the optical characteristics, it did not affect the molecular structure. To find the optical band gap energies of untreated and shocked NPs, Tauc plot relationships were used. The band-gap energies got smaller as the shock pulse became more substantial. The impact of shock waves caused oxygen vacancies and surface defects, lowering band gap energy. The test for photocatalytic testing showed that SrTiO3 NPs that are loaded with shock waves worked much better when they were exposed to visible light. The characteristics, including stress, strain, and bond length, were found to significantly influence photocatalytic applications. In addition, attempts were made to provide a viewpoint for future study. Overall, the objective of this research was to provide valuable insights for experts engaged in the field of SrTiO3.
{"title":"Experimental investigation of structural, morphological, and optical characteristics of SrTiO3 nanoparticles using a shock tube for photocatalytic applications","authors":"Surendhar Sakthivel, Sivaprakash Paramasivam, Periyasamy Velusamy, J. Jerries Infanta, Venkatesan Ragavendran, J. Mayandi, Sonachalam Arumugam, Ikhyun Kim","doi":"10.1515/zpch-2023-0486","DOIUrl":"https://doi.org/10.1515/zpch-2023-0486","url":null,"abstract":"\u0000 We investigated the role of dynamic shock waves in perovskite SrTiO3 (STO) material. XRD, FE-SEM, EDAX, FTIR, UV-DRS, XPS, and Raman spectroscopy were all used to examine the title material. When perovskite sample was loaded with shocks, its diffraction pattern did not show any crystal structure changes. The FE-SEM results suggest that the grain size increased linearly with the number of shocks. We used energy-dispersive X-ray spectroscopy to perform elemental analysis; results confirmed that SrTiO3 NPs were indeed present. Although the impulse of the shock wave changed the optical characteristics, it did not affect the molecular structure. To find the optical band gap energies of untreated and shocked NPs, Tauc plot relationships were used. The band-gap energies got smaller as the shock pulse became more substantial. The impact of shock waves caused oxygen vacancies and surface defects, lowering band gap energy. The test for photocatalytic testing showed that SrTiO3 NPs that are loaded with shock waves worked much better when they were exposed to visible light. The characteristics, including stress, strain, and bond length, were found to significantly influence photocatalytic applications. In addition, attempts were made to provide a viewpoint for future study. Overall, the objective of this research was to provide valuable insights for experts engaged in the field of SrTiO3.","PeriodicalId":506520,"journal":{"name":"Zeitschrift für Physikalische Chemie","volume":" 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139789022","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}
Pushparaj Gowthami, Subramanian Rohith Susi Kumar, G. Kalaiarasi, Arumugam Kosiha, Lakshminarayanan Srimathi Priya, Mohamed H. Mahmoud, Hassan Fouad, Abuzar Ansari
MnO2 NPs were synthesized from Delonix elata leaves extract act as a capping and reducing agent by green synthesis process. The synthesized MnO2 NPs were characterized by different spectroscopic techniques such as IR, UV-Vis, SEM and XRD analyses. The UV spectrum of synthesized MnO2 NPs revealed optical properties at 340 nm. The XRD pattern of MnO2 NPs exhibited the crystallite size to be in the range of 20 nm and shows the amorphous structure. The morphological geographies of MnO2 NPs are spherical and faintly agglomerated. The FT-IR spectrum of MnO2 NPs spectacles stretching vibration of Mn–O at 510 cm−1 confirmed the formation of MnO2 NPs. MnO2 is superior photo degradation for methylene blue which is extant in the textile industries and it has an unlimited potential application in wastewater treatment.
{"title":"Facile synthesis of MnO2 nanoparticles for the removal of cationic dye","authors":"Pushparaj Gowthami, Subramanian Rohith Susi Kumar, G. Kalaiarasi, Arumugam Kosiha, Lakshminarayanan Srimathi Priya, Mohamed H. Mahmoud, Hassan Fouad, Abuzar Ansari","doi":"10.1515/zpch-2023-0467","DOIUrl":"https://doi.org/10.1515/zpch-2023-0467","url":null,"abstract":"\u0000 MnO2 NPs were synthesized from Delonix elata leaves extract act as a capping and reducing agent by green synthesis process. The synthesized MnO2 NPs were characterized by different spectroscopic techniques such as IR, UV-Vis, SEM and XRD analyses. The UV spectrum of synthesized MnO2 NPs revealed optical properties at 340 nm. The XRD pattern of MnO2 NPs exhibited the crystallite size to be in the range of 20 nm and shows the amorphous structure. The morphological geographies of MnO2 NPs are spherical and faintly agglomerated. The FT-IR spectrum of MnO2 NPs spectacles stretching vibration of Mn–O at 510 cm−1 confirmed the formation of MnO2 NPs. MnO2 is superior photo degradation for methylene blue which is extant in the textile industries and it has an unlimited potential application in wastewater treatment.","PeriodicalId":506520,"journal":{"name":"Zeitschrift für Physikalische Chemie","volume":"22 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139805600","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}
K. Athira, S. Dhanapandian, Selvakumar Suthakaran, Sivadasan Shobika, Krishnan Yogalakshmi, Manikandan Ayyar, Munawar Iqbal
In this study, pure cobalt oxide (Co3O4) nanoparticles were synthesized using a simple hydrothermal approach. The effect of the reducing agent and reaction temperatures of the prepared products were examined. Co3O4 is formed in the as-synthesized sample, at reaction temperature 190 °C was observed in the XRD pattern. The XPS survey scan spectrum showed the distinctive peaks of the Co and O elements and their valence states. FESEM and HRTEM revealed the particles as cubical in nature. Peak associated with the elements Co and O on the EDAX spectrum demonstrated the purity of the nanoparticles. Three electrode setups were used to measure the electrochemical properties of the synthesized nanoparticles. DTA curve corresponding exothermic peak at 225 °C and the crystallization of the final product was attributed for the third weight loss of 1.5 % in the temperature range of 280 °C to 450 °C. Formation of Co3O4 was confirmed by the observed XRD diffraction peaks at 2θ = 36.83°, 59.82°, and 65.30°, which correspond to h k l planes (311), (511) and (440), respectively. The high-resolution Co2p spectra showed two prominent spin-orbital peaks, 2p1/2 and 2p3/2, at 796.37 eV and 781.81 eV, respectively. The increase in temperature causes the particle size to grow ranges between 20 and 70 nm and the average particle size distribution in the TEM image is 42 nm. The integral area of the CV curve was measured during the CV measurement and as the as-prepared Co3O4 electrode displays specific capacitance values of 154, 126, 81, 65, and 49 Fg−1 at various scan rates of 10, 20, 50, 70, and 100 mVs−1, respectively.
本研究采用简单的水热法合成了纯氧化钴（Co3O4）纳米粒子。研究了还原剂和反应温度对制备产物的影响。从 XRD 图谱中可以观察到，在反应温度为 190 ℃ 时，合成样品中形成了 Co3O4。XPS 扫描光谱显示了 Co 和 O 元素的独特峰值及其价态。FESEM 和 HRTEM 显示颗粒呈立方体。EDAX 光谱上与 Co 和 O 元素相关的峰值证明了纳米颗粒的纯度。使用三种电极设置来测量合成纳米粒子的电化学特性。DTA 曲线在 225 °C 处出现相应的放热峰，在 280 °C 至 450 °C 的温度范围内，最终产品的第三次重量损失为 1.5%，这归因于最终产品的结晶。在 2θ = 36.83°、59.82°和 65.30°处观察到的 XRD 衍射峰证实了 Co3O4 的形成，这些衍射峰分别对应于 h k l 平面 (311)、(511) 和 (440)。高分辨率 Co2p 光谱显示出两个突出的自旋轨道峰，即 2p1/2 和 2p3/2 峰，分别位于 796.37 eV 和 781.81 eV。温度的升高导致粒径在 20 纳米到 70 纳米之间增长，TEM 图像中的平均粒径分布为 42 纳米。在 CV 测量过程中测量了 CV 曲线的积分面积，在 10、20、50、70 和 100 mVs-1 的不同扫描速率下，制备的 Co3O4 电极的比电容值分别为 154、126、81、65 和 49 Fg-1。
{"title":"Facile hydrothermally grown cobalt oxide (Co3O4) nanostructures and their electrochemical performances","authors":"K. Athira, S. Dhanapandian, Selvakumar Suthakaran, Sivadasan Shobika, Krishnan Yogalakshmi, Manikandan Ayyar, Munawar Iqbal","doi":"10.1515/zpch-2023-0440","DOIUrl":"https://doi.org/10.1515/zpch-2023-0440","url":null,"abstract":"\u0000 In this study, pure cobalt oxide (Co3O4) nanoparticles were synthesized using a simple hydrothermal approach. The effect of the reducing agent and reaction temperatures of the prepared products were examined. Co3O4 is formed in the as-synthesized sample, at reaction temperature 190 °C was observed in the XRD pattern. The XPS survey scan spectrum showed the distinctive peaks of the Co and O elements and their valence states. FESEM and HRTEM revealed the particles as cubical in nature. Peak associated with the elements Co and O on the EDAX spectrum demonstrated the purity of the nanoparticles. Three electrode setups were used to measure the electrochemical properties of the synthesized nanoparticles. DTA curve corresponding exothermic peak at 225 °C and the crystallization of the final product was attributed for the third weight loss of 1.5 % in the temperature range of 280 °C to 450 °C. Formation of Co3O4 was confirmed by the observed XRD diffraction peaks at 2θ = 36.83°, 59.82°, and 65.30°, which correspond to h k l planes (311), (511) and (440), respectively. The high-resolution Co2p spectra showed two prominent spin-orbital peaks, 2p1/2 and 2p3/2, at 796.37 eV and 781.81 eV, respectively. The increase in temperature causes the particle size to grow ranges between 20 and 70 nm and the average particle size distribution in the TEM image is 42 nm. The integral area of the CV curve was measured during the CV measurement and as the as-prepared Co3O4 electrode displays specific capacitance values of 154, 126, 81, 65, and 49 Fg−1 at various scan rates of 10, 20, 50, 70, and 100 mVs−1, respectively.","PeriodicalId":506520,"journal":{"name":"Zeitschrift für Physikalische Chemie","volume":"37 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139863893","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}
K. Athira, S. Dhanapandian, Selvakumar Suthakaran, Sivadasan Shobika, Krishnan Yogalakshmi, Manikandan Ayyar, Munawar Iqbal
In this study, pure cobalt oxide (Co3O4) nanoparticles were synthesized using a simple hydrothermal approach. The effect of the reducing agent and reaction temperatures of the prepared products were examined. Co3O4 is formed in the as-synthesized sample, at reaction temperature 190 °C was observed in the XRD pattern. The XPS survey scan spectrum showed the distinctive peaks of the Co and O elements and their valence states. FESEM and HRTEM revealed the particles as cubical in nature. Peak associated with the elements Co and O on the EDAX spectrum demonstrated the purity of the nanoparticles. Three electrode setups were used to measure the electrochemical properties of the synthesized nanoparticles. DTA curve corresponding exothermic peak at 225 °C and the crystallization of the final product was attributed for the third weight loss of 1.5 % in the temperature range of 280 °C to 450 °C. Formation of Co3O4 was confirmed by the observed XRD diffraction peaks at 2θ = 36.83°, 59.82°, and 65.30°, which correspond to h k l planes (311), (511) and (440), respectively. The high-resolution Co2p spectra showed two prominent spin-orbital peaks, 2p1/2 and 2p3/2, at 796.37 eV and 781.81 eV, respectively. The increase in temperature causes the particle size to grow ranges between 20 and 70 nm and the average particle size distribution in the TEM image is 42 nm. The integral area of the CV curve was measured during the CV measurement and as the as-prepared Co3O4 electrode displays specific capacitance values of 154, 126, 81, 65, and 49 Fg−1 at various scan rates of 10, 20, 50, 70, and 100 mVs−1, respectively.
本研究采用简单的水热法合成了纯氧化钴（Co3O4）纳米粒子。研究了还原剂和反应温度对制备产物的影响。从 XRD 图谱中可以观察到，在反应温度为 190 ℃ 时，合成样品中形成了 Co3O4。XPS 扫描光谱显示了 Co 和 O 元素的独特峰值及其价态。FESEM 和 HRTEM 显示颗粒呈立方体。EDAX 光谱上与 Co 和 O 元素相关的峰显示了纳米颗粒的纯度。使用三种电极设置来测量合成纳米粒子的电化学特性。DTA 曲线在 225 °C 处出现相应的放热峰，在 280 °C 至 450 °C 的温度范围内，最终产品的第三次重量损失为 1.5%，这归因于最终产品的结晶。在 2θ = 36.83°、59.82°和 65.30°处观察到的 XRD 衍射峰证实了 Co3O4 的形成，这些衍射峰分别对应于 h k l 平面 (311)、(511) 和 (440)。高分辨率 Co2p 光谱显示出两个突出的自旋轨道峰，即 2p1/2 和 2p3/2 峰，分别位于 796.37 eV 和 781.81 eV。温度的升高导致粒径在 20 纳米到 70 纳米之间增长，TEM 图像中的平均粒径分布为 42 纳米。在 CV 测量过程中测量了 CV 曲线的积分面积，在 10、20、50、70 和 100 mVs-1 的不同扫描速率下，制备的 Co3O4 电极的比电容值分别为 154、126、81、65 和 49 Fg-1。
{"title":"Facile hydrothermally grown cobalt oxide (Co3O4) nanostructures and their electrochemical performances","authors":"K. Athira, S. Dhanapandian, Selvakumar Suthakaran, Sivadasan Shobika, Krishnan Yogalakshmi, Manikandan Ayyar, Munawar Iqbal","doi":"10.1515/zpch-2023-0440","DOIUrl":"https://doi.org/10.1515/zpch-2023-0440","url":null,"abstract":"\u0000 In this study, pure cobalt oxide (Co3O4) nanoparticles were synthesized using a simple hydrothermal approach. The effect of the reducing agent and reaction temperatures of the prepared products were examined. Co3O4 is formed in the as-synthesized sample, at reaction temperature 190 °C was observed in the XRD pattern. The XPS survey scan spectrum showed the distinctive peaks of the Co and O elements and their valence states. FESEM and HRTEM revealed the particles as cubical in nature. Peak associated with the elements Co and O on the EDAX spectrum demonstrated the purity of the nanoparticles. Three electrode setups were used to measure the electrochemical properties of the synthesized nanoparticles. DTA curve corresponding exothermic peak at 225 °C and the crystallization of the final product was attributed for the third weight loss of 1.5 % in the temperature range of 280 °C to 450 °C. Formation of Co3O4 was confirmed by the observed XRD diffraction peaks at 2θ = 36.83°, 59.82°, and 65.30°, which correspond to h k l planes (311), (511) and (440), respectively. The high-resolution Co2p spectra showed two prominent spin-orbital peaks, 2p1/2 and 2p3/2, at 796.37 eV and 781.81 eV, respectively. The increase in temperature causes the particle size to grow ranges between 20 and 70 nm and the average particle size distribution in the TEM image is 42 nm. The integral area of the CV curve was measured during the CV measurement and as the as-prepared Co3O4 electrode displays specific capacitance values of 154, 126, 81, 65, and 49 Fg−1 at various scan rates of 10, 20, 50, 70, and 100 mVs−1, respectively.","PeriodicalId":506520,"journal":{"name":"Zeitschrift für Physikalische Chemie","volume":"14 14","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139804102","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}
Pushparaj Gowthami, Subramanian Rohith Susi Kumar, G. Kalaiarasi, Arumugam Kosiha, Lakshminarayanan Srimathi Priya, Mohamed H. Mahmoud, Hassan Fouad, Abuzar Ansari
MnO2 NPs were synthesized from Delonix elata leaves extract act as a capping and reducing agent by green synthesis process. The synthesized MnO2 NPs were characterized by different spectroscopic techniques such as IR, UV-Vis, SEM and XRD analyses. The UV spectrum of synthesized MnO2 NPs revealed optical properties at 340 nm. The XRD pattern of MnO2 NPs exhibited the crystallite size to be in the range of 20 nm and shows the amorphous structure. The morphological geographies of MnO2 NPs are spherical and faintly agglomerated. The FT-IR spectrum of MnO2 NPs spectacles stretching vibration of Mn–O at 510 cm−1 confirmed the formation of MnO2 NPs. MnO2 is superior photo degradation for methylene blue which is extant in the textile industries and it has an unlimited potential application in wastewater treatment.
{"title":"Facile synthesis of MnO2 nanoparticles for the removal of cationic dye","authors":"Pushparaj Gowthami, Subramanian Rohith Susi Kumar, G. Kalaiarasi, Arumugam Kosiha, Lakshminarayanan Srimathi Priya, Mohamed H. Mahmoud, Hassan Fouad, Abuzar Ansari","doi":"10.1515/zpch-2023-0467","DOIUrl":"https://doi.org/10.1515/zpch-2023-0467","url":null,"abstract":"\u0000 MnO2 NPs were synthesized from Delonix elata leaves extract act as a capping and reducing agent by green synthesis process. The synthesized MnO2 NPs were characterized by different spectroscopic techniques such as IR, UV-Vis, SEM and XRD analyses. The UV spectrum of synthesized MnO2 NPs revealed optical properties at 340 nm. The XRD pattern of MnO2 NPs exhibited the crystallite size to be in the range of 20 nm and shows the amorphous structure. The morphological geographies of MnO2 NPs are spherical and faintly agglomerated. The FT-IR spectrum of MnO2 NPs spectacles stretching vibration of Mn–O at 510 cm−1 confirmed the formation of MnO2 NPs. MnO2 is superior photo degradation for methylene blue which is extant in the textile industries and it has an unlimited potential application in wastewater treatment.","PeriodicalId":506520,"journal":{"name":"Zeitschrift für Physikalische Chemie","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139865593","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}
B. Inah, Emmanuel E. D. Okon, Bitrus H. Andrew, Maxell-Borjor A. Eba, Henry O. Edet, T. Unimuke, T. Gber, E. Agwamba, I. Benjamin, Adedapo S. Adeyinka, H. Louis
Abstract Gas sensors exhibit significant potential due to their widespread use in various applications, such as food packaging, indoor air quality assessment, and real-time monitoring of man-made gas emissions to mitigate global warming. The utilization of nanostructured materials for sensor and adsorbent surfaces has seen remarkable growth over time, though substantial efforts are still needed to develop more efficient adsorbents. Consequently, this study investigates the viability of metal-doped quantum dots (QDs) as prospective gas-sensing and adsorption materials. Density functional theory (DFT) calculations employing the 6-311 + G(d,p) basis set and three functionals (B3LYP, B3LYP-GD3(BJ), and ɷB97XD) were utilized for this investigation. Three environmentally and health-significant gases (C6H6, CO2, and H2S) were chosen as adsorbates on arsenic (As) and cobalt (Co) functionalized QDs to assess the performance and sensing capabilities of resulting QD surfaces. The analysis encompassed computation of adsorption energy, thermodynamic properties, non-covalent interactions, natural bond orbital analysis, and other topological aspects for both the surfaces and gases. The outcomes indicate that the GP_As functionalized surface exhibits a lower energy gap, rendering it more reactive and sensitive toward the respective gases (C6H6, CO2, and H2S). Moreover, the calculated adsorption energies of the investigated systems indicate thermodynamic favorability and spontaneity. Notably, our findings suggest that QD_As surfaces possess superior adsorption potential for H2S compared to the other gases examined; nonetheless, all studied QD surfaces demonstrate significant adsorption capacities for C6H6, CO2, and H2S gases.
{"title":"Detection of C6H6, CO2, and H2S gases on arsenic (As) and cobalt (Co) doped quantum dots (QDs) nanostructured materials","authors":"B. Inah, Emmanuel E. D. Okon, Bitrus H. Andrew, Maxell-Borjor A. Eba, Henry O. Edet, T. Unimuke, T. Gber, E. Agwamba, I. Benjamin, Adedapo S. Adeyinka, H. Louis","doi":"10.1515/zpch-2023-0451","DOIUrl":"https://doi.org/10.1515/zpch-2023-0451","url":null,"abstract":"Abstract Gas sensors exhibit significant potential due to their widespread use in various applications, such as food packaging, indoor air quality assessment, and real-time monitoring of man-made gas emissions to mitigate global warming. The utilization of nanostructured materials for sensor and adsorbent surfaces has seen remarkable growth over time, though substantial efforts are still needed to develop more efficient adsorbents. Consequently, this study investigates the viability of metal-doped quantum dots (QDs) as prospective gas-sensing and adsorption materials. Density functional theory (DFT) calculations employing the 6-311 + G(d,p) basis set and three functionals (B3LYP, B3LYP-GD3(BJ), and ɷB97XD) were utilized for this investigation. Three environmentally and health-significant gases (C6H6, CO2, and H2S) were chosen as adsorbates on arsenic (As) and cobalt (Co) functionalized QDs to assess the performance and sensing capabilities of resulting QD surfaces. The analysis encompassed computation of adsorption energy, thermodynamic properties, non-covalent interactions, natural bond orbital analysis, and other topological aspects for both the surfaces and gases. The outcomes indicate that the GP_As functionalized surface exhibits a lower energy gap, rendering it more reactive and sensitive toward the respective gases (C6H6, CO2, and H2S). Moreover, the calculated adsorption energies of the investigated systems indicate thermodynamic favorability and spontaneity. Notably, our findings suggest that QD_As surfaces possess superior adsorption potential for H2S compared to the other gases examined; nonetheless, all studied QD surfaces demonstrate significant adsorption capacities for C6H6, CO2, and H2S gases.","PeriodicalId":506520,"journal":{"name":"Zeitschrift für Physikalische Chemie","volume":"41 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139437135","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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