Synthesis of Cu<sub>2</sub>O micro/nanocrystals with tunable morphologies using coordinating ligands as structure controlling agents and antimicrobial studies

Theja, G. Sree; Christena, Lowrence Rene; Ravi, V.; Nagarajan, Saisubramanian; Anthony, Savarimuthu Philip

doi:10.1039/c4ce01649a

Cited by 24 publications

(18 citation statements)

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“…6a). In presence of H 2 O 2 , the MB dye solution showed a drastic decrease of absorption 10 immediately and steady decrease of absorption afterwards (Fig. 6b).…”

Section: Resultsmentioning

confidence: 88%

“…26 The change of ligand structure (1-3) could have influence on the metal-ligand interactions (Sheme S4). The simple alanine ligand, 1, without phenolic 10 hydroxyl might have only weak interaction with copper metal ions. The uncontrolled reaction of sulphur from thiourea under hydrotherml condition produces different morphologies of CuS.…”

Section: Resultsmentioning

confidence: 99%

“…In this manuscript, we report the hydrothermal synthesis of CuS nano/microstructures with different morphologies using alanine amino based reduced Schiff base ligands (1-3, Scheme 1) as structure directing agents. Solid microspheres along with smaller sized nanoparticles and 10 plates (1-CuS) were obtained using 1. 2 and 3 produced spherical nanocrystalline CuS (2-CuS) and microspheres made of nanoflakes (3-CuS), respectively.…”

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confidence: 99%

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Alanine based coordinating ligand mediated hydrothermal synthesis of CuS nano/microstructures and morphology dependent photocatalysis

et al. 2015

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Along with this covering note we are submitting the revised manuscript. We are thankful to the referee for giving critical comments. In this regard, we have repeated the experiments as suggested by the referee. Below we provide the specific comments of the referee (in italics) and our response.Further to the suggested revisions, we have made some additional changes in the manuscript to improve the presentation quality. We hope that the revised manuscript will get positive consideration for publishing in CrystEngCommun. Sincerely yours S. Philip Anthony RefereeMost of the questions given in my earlier report is not answered properly. It seems authors not focusing the particular questions rather they want to answer something to make reviewer happy! For examples, we asked to provide better FE-SEM images but not supplied. Author should put better quality low magnified FE-SEM image to understand the overall morphology of the sample.We strongly apologizes to the reviewer. As suggested by the reviewer, we have performed FE-SEM for all samples. The images are given below. Unfortunately, we could not get better quality images than the previously given in the manuscript and hence we did not include in the revised manuscript.The images were recorded after sonicating the samples. We sonicated the samples in an effort to deaggregate nanoparticles for better visualization of morphology. (A University established under section 3 of the UGC Act, 1956) Thanjavur -613 401, TamilNadu, India Phone: 91 4362 264101 -108 ext.120, 304000-29 Fax: 91 4362 264120 Website: www.sastra.edu The FT-IR analysis not at all satisfactory. It is not clearly explained why they have done this analysis? Need to compare with only alanine and alanine coordinated CuS. Moreover, the proper mode of vibration should be included. As suggested by the reviewer, we have performed FT-IR studies for the ligands as well as 1-5-CuS nanoparticles to confirm the organic ligand surface functionality on the nanoparticles surface. New figure for IR along (both pure ligands as well as with CuS) has been added in the revised manuscript (Fig. 5). The comparison of IR spectra of ligands and ligands with CuS clearly suggest the presence of organic functionality in the nanoparticles. The sentences for IR studies have also been modified in the revised manuscript at page no. 3, line 72-85. (A University established under section 3 of the UGC Act, 1956)Thanjavur -613 401, TamilNadu, India Phone: 91 4362 264101 -108 ext.120, 304000-29 Fax: 91 4362 264120 Website: www.sastra.edu From PXRD it is not possible to confirm about the formation of CuS nano/microstructures. How author confirm that there is no formation of CuO? There is strong chance for the formation of mixed materials like CuS and CuO. It will be better if author take more initiation to do the XPS experiment from other institutions nearby. Without XPS, it is meaningless to confirm the formation of CuS.Further as suggested by the reviewer, we have also performed XPS analysis for CuS prepared using ligand 2 and that clearly...

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“…6a). In presence of H 2 O 2 , the MB dye solution showed a drastic decrease of absorption 10 immediately and steady decrease of absorption afterwards (Fig. 6b).…”

Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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Alanine based coordinating ligand mediated hydrothermal synthesis of CuS nano/microstructures and morphology dependent photocatalysis

et al. 2015

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“…By means of the reflectance spectra, it is possible to calculate the band gap energies of semiconductor materials using the following equation proposed in the literature [29][30][31][32][33]:…”

Section: Fors (Fibre Optics Reflectance Spectroscopy)mentioning

confidence: 99%

“…As mentioned by Rosi [29], it was necessary to convert the FORS spectra into Kubelka-Munk values which are proportional to the absorption coefficient. Afterwards a band gap energy was calculated by extrapolating the linear region of a plot of (αhv) 2 vs. hv [29][30][31][32][33].…”

Section: Fors (Fibre Optics Reflectance Spectroscopy)mentioning

confidence: 99%

Nanotechnology in Roman Opaque Red Glass from the 2nd Century AD. Archaeometric Investigation in Red Sectilia from the Decoration of the Lucius Verus Villa in Rome

Bandiera¹,

Lehuédé

Verità

et al. 2019

Heritage

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This work aims to characterise the chemical composition of Roman opaque red glass sectilia dated to the 2nd century A.D and to shed light on Roman glassmaking production of different shades of red, from red to reddish-brown. Due to the lack of technical historical sources for this period many questions about technological aspects still remain. In this project a multi-disciplinary approach is in progress to investigate the red glass sectilia with several red hues from the Imperial Villa of Lucius Verus (161–169 A.D.) in Rome. First, colorimetric measurements were taken to identify the various red hues. The second step was chemical characterization of the samples and the identification of crystalline colouring phases. Particle Induced X-Ray Emission (PIXE) analysis was used to investigate the chemical composition of these glass samples, while the crystalline phases were identified by Raman Spectroscopy and Scanning Electrons Microscope with Energy Dispersive X-ray Spectrometry (SEM-EDS). Using SEM-EDS nanoparticles were detected as a colouring agent, the chemical composition and the morphology of which has been studied in depth. This information has been compared with the colorimetric analysis to establish any correlation with the different colour hues.

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Simple and Rapid One‐Step Electrochemical Synthesis of Nanogranular Cu₂O Films

et al. 2018

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In the present work, we report a simple experimental strategy for the one-step electrochemical synthesis of nanogranular Cu 2 O films by copper anodization in fluoride-containing ethylene glycol media. Microscopic exploration using field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM) and transmission electron microscopy (TEM), shows the formation of spherical shape grains with sizes ranging from 20 to 40 nm. Raman and X-Ray Photoemission Spectroscopy (XPS) results indicate that only Cu I oxide is obtained. A band gap energy E g = 2.01 eV is estimated from UV-vis reflectance spectroscopy indicating that an indirect transition mechanism between semiconductor bands takes place. These evidences indicate that the present synthesis of nanogranular Cu 2 O films is a promising method for obtaining improved properties of materials for the design of photoelectronic devices.One of the most interesting purposes in the current nanoscience and nanotechnology research is the optimization of synthesis strategies for tuning the properties of materials at nanoscale dimensions for specific applications. Consequently, a wide variety of metallic, semiconductor and polymeric nanostructures with different size and shape-dependent properties have been obtained.Among semiconductor materials, Cu 2 O has been one of the most studied for applications in photovoltaic cells and electrocatalysis as well as for its microbial activity due to the non-toxic nature, availability, low-cost and narrow band gap (E g � 1.9 eV -2.2 eV). [1][2][3][4][5][6] In the last years, several reports on the synthesis and characterization of different Cu 2 O nanostructures using solgel and hydrothermal routes, template assisted growth, electrochemical deposition and anodization, have been published. [3][4][5][6][7][8][9][10][11][12][13][14] Particularly, Allam et al [13] reported the synthesis of various Cu 2 O nanostructured thin films by anodization of Cu foils in aqueous or ethylene glycol media containing hydroxide, chloride and/or fluoride ions. In aqueous alkaline electrolytes, no stable anodic films on the surface were obtained. Electrodeposited Cu 2 O crystallites or dendritic structures were obtained in the presence of chloride ions while in the presence of fluoride ions, uniform nanoporous structures or porous spheroids were achieved. The as-anodized porous nanoarchitectures were composed of a mixture of copper hydroxide and copper oxide phases. On the other hand, for anodization of Cu in ethylene glycol-based electrolytes containing fluoride, leaf-like nanostructures were obtained but no structural film formation was found for the conditions employed. Despite of the variety of nanostructures reported (crystallites, dendritic structures, porous spheroids and leaf-like nanostructures) the synthesis in ethylene glycol media has not been extensively explored. More recently, [14] we have reported that the anodization of copper in alkaline water/ethylene glycol media containing fluoride ions generates nanostructured copper oxide f...

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Synthesis of Cu₂O micro/nanocrystals with tunable morphologies using coordinating ligands as structure controlling agents and antimicrobial studies

Cited by 24 publications

References 41 publications

Alanine based coordinating ligand mediated hydrothermal synthesis of CuS nano/microstructures and morphology dependent photocatalysis

Alanine based coordinating ligand mediated hydrothermal synthesis of CuS nano/microstructures and morphology dependent photocatalysis

Nanotechnology in Roman Opaque Red Glass from the 2nd Century AD. Archaeometric Investigation in Red Sectilia from the Decoration of the Lucius Verus Villa in Rome

Simple and Rapid One‐Step Electrochemical Synthesis of Nanogranular Cu₂O Films

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Synthesis of Cu2O micro/nanocrystals with tunable morphologies using coordinating ligands as structure controlling agents and antimicrobial studies

Cited by 24 publications

References 41 publications

Alanine based coordinating ligand mediated hydrothermal synthesis of CuS nano/microstructures and morphology dependent photocatalysis

Alanine based coordinating ligand mediated hydrothermal synthesis of CuS nano/microstructures and morphology dependent photocatalysis

Nanotechnology in Roman Opaque Red Glass from the 2nd Century AD. Archaeometric Investigation in Red Sectilia from the Decoration of the Lucius Verus Villa in Rome

Simple and Rapid One‐Step Electrochemical Synthesis of Nanogranular Cu2O Films

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Synthesis of Cu₂O micro/nanocrystals with tunable morphologies using coordinating ligands as structure controlling agents and antimicrobial studies

Simple and Rapid One‐Step Electrochemical Synthesis of Nanogranular Cu₂O Films