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- DüzeltmeAçık Erişim2026Scopus SJRQ2Retraction Note: Synthesis of Bimetallic Nickel-Cobalt Nanoparticles Supported by Functional Multi-Walled Carbon Nanotubes by Chemical Methods: Characterization and Hydrogen Energy Generation (Topics in Catalysis, (2024), 67, 9-12, (606-614), 10.1007/s11244-024-01907-x)
Zare, Najmeh; Karimi, Fatemeh; Altuner, Elif Esra; Mashkoor, Hussein; Tiri, Rima Nour Elhouda; Gulbagca, Fulya; Bijad, Majede; Cherif, Ali; Sen, Fatih
The Editors-in-Chief have retracted this article because of errors and inconsistencies which raise concerns regarding the validity of the research reported in this work. A review conducted by the journal found that: The turnover frequency reported in the section entitled Catalytic Studies of Hydrogen Production was incorrectly calculated; There is no conclusive evidence that bimetallic Nickel-Cobalt nanoparticles associated with carbon nanotubes were synthesized, as the reported XRD pattern and TEM micrographs don’t support this result. Furthermore, the description of the synthesis procedure was considered to be lacking in substance; The differences between the average sizes of nanoparticles is not adequately explained. The authors were asked to comment on these concerns, but their explanation was deemed unsatisfactory. The Editors-in-Chief no longer have confidence in the research presented in this article. The authors disagree with this retraction.
- DüzeltmeAçık Erişim2025Scopus SJRQ2Retraction Note: Synthesis of Silver Nanoparticles by Biogenic Methods: Characterization and Development of a Sensor Sensible to Pharmaceutical Medicine Paracetamol (Topics in Catalysis, (2024), 67, 9-12, (585-593), 10.1007/s11244-023-01887-4)
Karimi, Fatemeh; Altuner, Elif Esra; Aygun, Aysenur; Bayat, Ramazan; Rajendran, Saravanan; Sen, Fatih
The Editors-in-Chief have retracted this article because of concerns regarding the validity of the research reported in this work. A review conducted by the journal found that the reported average crystalline size for silver nanoparticles (NPs) as determined by an analysis of the XRD intensity peaks (Fig. 3) is not consistent with the average size determined by TEM imaging (Fig. 4a), and that the former analysis was not adequately reported in the article. Furthermore, there is lack of agreement between the TEM result shown in Fig. 4 and the size distribution of NPs presented in the inset. The authors were asked to comment on these concerns, but their explanation was deemed unsatisfactory. The Editors-in-Chief no longer have confidence in the research presented in this article. The authors disagree with this retraction.
- MakaleYalnız künye2024Scopus SJRQ2Synthesis of Bimetallic Nickel-Cobalt Nanoparticles Supported by Functional Multi-Walled Carbon Nanotubes by Chemical Methods: Characterization and Hydrogen Energy Generation
Zare, Najmeh; Karimi, Fatemeh; Altuner, Elif Esra; Mashkoor, Hussein; Tiri, Rima Nour Elhouda; Gulbagca, Fulya; Bijad, Majede; Cherif, Ali; Sen, Fatih
In this study, nickel-cobalt@functionalized multi-walled carbon nanoparticles (NiCo@f-MWCNT NPs) were synthesized, analysed, and used for hydrogen generation via methanolysis on NaBH4. For the NPs synthesis, two steps were conducted (i.e., i: MWCNT was functionalized in an acid medium to support NPs (f-MWCNT); ii: NiCo NPs were synthesized and supplemented with f-MWCNT). Various characterization techniques were used to examine the morphological structure of NiCo@f-MWCNT NPs. The transmission electron microscope (TEM) results showed that the NPs were sized as 3.941 ± 1.094 nm with a spherical structure. The X-ray diffraction analysis (XRD) results indicated an average crystalline size of 1.46 nm. The evaluation of the catalytic performance for hydrogen production revealed that the turnover frequency (TOF) was calculated to be 2934.4 min− 1 with activation energy (Ea) and enthalpy (∆H) of 39.29 kJ/mol and 36.74 kJ/mol, respectively, which indicates high viability for hydrogen transport and generation application and processes.
AtıfScopus13OpenAlex10
İncele - MakaleYalnız künye2024Scopus SJRQ2Synthesis of Silver Nanoparticles by Biogenic Methods: Characterization and Development of a Sensor Sensible to Pharmaceutical Medicine Paracetamol
Karimi, Fatemeh; Altuner, Elif Esra; Aygun, Aysenur; Bayat, Ramazan; Rajendran, Saravanan; Sen, Fatih
In this study, silver nanoparticles (Ag NPs) were synthesized in biogenic methods. It is aimed to improve the electrochemical sensor efficiency of synthesized Ag NPs against the pharmaceutical drug paracetamol. For this purpose, fourier transmission infrared spectroscopy (FTIR), ultra-violet visible spectroscopy (Uv–vis), X-ray differentiation (XRD), and transmission electron spectroscopy (TEM) analyses were performed to elucidate the structure of the synthesized Ag NPs. In the TEM characterization results, the mean size of the NPs was found to be 19.035 nm using TEM characterization and the XRD results, the crystalline size of the NPs was 11.66 nm. Sensor studies were performed with cyclic voltammetry (CV) and differential pulse voltammetry (DPV) techniques. Paracetamol showed a sensitivity of approximately 0.4 V to Ag NPs in this study. The linear ranges of this study are 6.5–14.5 µM, with a limit of detection (LOD) of 5.79 µM and a limit of quantification (LOQ) of 17.56 µM.
AtıfScopus12WoS7OpenAlex11
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