Preparation of Cu2O nano-colloid and its application as selective colorimetric sensor for Ag+ ion

Andal, V.; Buvaneswari, G.

doi:10.1016/j.snb.2011.01.025

Cited by 29 publications

(22 citation statements)

References 26 publications

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“…Therefore, NaBH 4 can reduce Cu 2+ ions to their lowest oxidation states (Cu 0 or Cu + ). NaBH 4 is a powerful reducing agent, due to 1) the evolution of hydrogen [37,39,45]; 2) the ability for NaBH 4 to directly reduce Cu 2+ ions to Cu 0 [36,38,46]; 3) due to its ability to directly reduce Cu 2+ ions to Cu 0 .…”

Section: Resultsmentioning

confidence: 99%

Easy, Quick, and Reproducible Sonochemical Synthesis of CuO Nanoparticles

et al. 2019

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Copper oxide nanoparticles (CuO NPs) were synthesized in air by reducing copper (II) sulfate pentahydrate salt (CuSO4·5H2O) in the presence of sodium borohydride. The reaction was stabilized with Hexadecyltrimethylammonium bromide (CTAB) in a basic medium and using ultrasound waves. Different molar ratios of CTAB:Cu2+ and NaBH4:Cu2+ were explored, to optimize the synthesis conditions, and to study the stability, size, and Zeta potential of the colloidal suspension. Optimum conditions to generate spherical, stable, and monodispersed nanoparticles with hydrodynamic diameters of 36 ± 1.3 nm were obtained, using 16 mM CTAB and 2 M NaBH4 (molar ratios Cu2+:CTAB:NaBH4 of 1:6:10). X-ray diffraction (XRD) was implemented, and a monoclinic CuO crystal system was formed. This demonstrated a monoclinic crystal system corresponding to CuO. The diffraction peaks were identified and confirmed according to their selected area electron diffraction (SAED) patterns.

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Section: Resultsmentioning

confidence: 99%

Easy, Quick, and Reproducible Sonochemical Synthesis of CuO Nanoparticles

et al. 2019

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“…(8)(9)(10)(11)(12) CuO is also an interesting candidate for application to solar energy conversion devices, superconducting devices, (13) gas sensors, (14) and material sensors. (15)(16)(17)(18) CuO (monoclinic) is reported to possess n-type conductivity with band-gap values (E g values) of 1.9-2.1. Cu 2 O (cubic) is typical of the oldest p-type semiconducting materials with E g values of 2.1-2.5 eV.…”

Section: Introductionmentioning

confidence: 99%

Investigations of Cuprous Oxide and Cupric Oxide Thin Films by Controlling the Deposition Atmosphere in the Reactive Sputtering Method

2016

Sensors and Materials

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Cu 2 O is a direct and narrow band-gap material; hence, it serves as an important candidate material for applications such as solar cells. In this study, copper (Cu) metal was used as a target and the reactive sputtering method was used to deposit cuprous oxide (Cu 2 O) and cupric oxide (CuO) thin films on indium tin oxide (ITO) glass. The formation of Cu 2 O and CuO thin films was controlled by varying oxidation conditions, such as controlling the deposition atmosphere (called the O 2 ratio). The microstructure, crystalline orientation, and optical properties of Cu 2 O and CuO thin films were measured using X-ray diffraction and optical spectroscopy, respectively. The results for the deposited thin films indicated that the formation of thin films as Cu 2 O and CuO phases was controlled by the flow rate of oxygen during the deposition process. In addition, the (αhv) n -hν curve plot was used to find the optical energy band gap of the Cu 2 O and CuO thin films. Moreover, we found that the crystalline phase and morphology of the deposited thin films affected the properties of the spectral response. This study provides a reference for the possible exploration and application of new, high-performance thin-film photovoltaic solar cells.

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“…6,10,12,13 Previous studies have shown the various methods of preparing metal nanoparticles externally. [14][15][16][17] Also, these metal ions can be formed into metal nanoparticles within the wool fibres by in situ reactions. [18][19][20][21] The metal nanoparticles that have been incorporated into wool fibres are stable for washing.…”

Section: General Overviewmentioning

confidence: 99%

“…Nanostructured materials can exist either as individual particles, or clusters of nanoparticles of various shapes and sizes. Examples for nanoclusters are Cu 2 O, 16 ZnS, 62 ZnO 63 and CdSe 64,65 etc.…”

Section: Nanostructured Materialsmentioning

confidence: 99%

“…Cu 2 O nanoparticles have been prepared externally by many methods, such as electrochemical, 72 sonochemical, 73 thermal decomposition, 74 microwave irradiation, 75 solution phase 16,76 and sol-gel. 77 The starting materials for the synthesis of Cu 2 O nano-colloids were copper sulfate (CuSO 4 .5H 2 O), sodium borohydride (NaBH 4 ) and sodium alginate.…”

Section: Formation Of Cu 2 O Nanoparticles By An Ex Situ Reactionmentioning

confidence: 99%

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Some Uptake Studies of Metal Ions and the Formation of Cu₂0 Particles in Wool

Samarasinghe¹

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<p>This research programme is concerned with the uptake studies of Cu2+, Zn2+ and Mn2+ at different conditions, by merino wool fibres and also uptake studies of Cu2+ ions by chemically modified wool fibres. Cu2O particles and Cu complexes are formed within merino wool by an in situ reaction with sodium borohydride and thioglycoloic acid respectively. The d-block elements have the ability to bind chemically to certain functional groups present within the keratin protein of wool. The absorption of the Cu2+, Mn2+ and Zn2+ from solution by wool fibres under different conditions notably, time, temperature and initial concentration have been studied. The optimum temperature and reaction time to give highest absorption of the Cu2+ by the wool fibre was found to be 90 oC and one hour without modifying the nature of the wool, from a solution of Cu2+ concentration of 450 mg L-1. Cu2+ was found to give the greatest absorption by the wool fibres, whereas Zn2+ and Mn2+ were found to be absorbed the least. The absorption of Cu2+ ions increases with increasing temperature. At the higher temperature of 90 oC, the -S-S- bonds in the cystine amino acids break more readily, generating thiol and cysteic acid groups to bind with copper ions. The uptake of Cu2+ by ethylenediaminetetraacetic dianhydride (14 mg g-1 of wool) or thioglycolic acid (42.5 mg g-1 of wool) or sodium borohydride (41.8 mg g-1 of wool) treated merino wool fibres increases with respect to unmodified wool (8 mg g-1 of wool). NaBH4 treated merino wool reduces Cu2+ ions to Cu2O particles which form within the wool fibres by an in situ reaction. TGA treated merino wool provides additional functional groups to bind with copper ions and Cu2O particles also likely to be formed within TGA treated wool composites. The metal ions were absorbed into the fibres under various conditions and the extent of absorption was quantified. The form and binding of the Cu2O particles or Cu2+ ions onto the wool fibres are studied using UV-Visible, FTIR, XRD, SEM, EDS and TEM methods.</p>

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Preparation of Cu2O nano-colloid and its application as selective colorimetric sensor for Ag+ ion

Cited by 29 publications

References 26 publications

Easy, Quick, and Reproducible Sonochemical Synthesis of CuO Nanoparticles

Easy, Quick, and Reproducible Sonochemical Synthesis of CuO Nanoparticles

Investigations of Cuprous Oxide and Cupric Oxide Thin Films by Controlling the Deposition Atmosphere in the Reactive Sputtering Method

Some Uptake Studies of Metal Ions and the Formation of Cu₂0 Particles in Wool

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