Synthesis and optical properties of colloidal CuO nanoparticles

Dagher, Sawsan; Haik, Yousef; Ayesh, Ahmad I.; Tit, Nacir

doi:10.1016/j.jlumin.2014.02.015

Cited by 184 publications

(76 citation statements)

References 48 publications

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“…The presence of surfactant or ligand chemistries is essential for minimizing particle coalescence and agglomeration during standard colloid synthesis; however, such chemistries impact significantly on the resultant nanoparticle optoelectronic properties and restrict the opportunity for bandgap tuning . Synthesis of non‐agglomerated and pure CuO nanostructures is imperative for their successful integration in application devices, and therefore, developing an alternative, cheap, and environmentally friendly synthesis method is highly desirable.…”

Section: Introductionmentioning

confidence: 99%

Ultra‐small CuO nanoparticles with tailored energy‐band diagram synthesized by a hybrid plasma‐liquid process

Velusamy

Liguori

Macías-Montero

et al. 2017

Plasma Processes & Polymers

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CuO is a versatile p-type material for energy applications capable of imparting diverse functionalities by manipulating its band-energy diagram. We present ultrasmall quantum confined cupric oxide nanoparticles (CuO NPs) synthesized via a simple one-step environmentally friendly atmospheric pressure microplasma synthesis process. The proposed method, based on the use of a hybrid plasma-liquid cell, enables the synthesis of CuO NPs directly from solid metal copper in ethanol with neither surfactants nor reducing agents. CuO NPs films are then used for the first time in all-inorganic third generation solar cell devices demonstrating highly effective functionalities as blocking layer. K E Y W O R D Sband structure, cupric oxide quantum dots, one step-green synthesis, quantum dots/inorganic solar cells | INTRODUCTIONTransition metal oxides, due to their inertness, stability, raw material abundance, and low-cost, are highly desirable materials for many applications, for example, solar cells, supercapacitors, light emitting diodes, photodetectors, field effect transistors, batteries and bio and gas sensors, among others. [1][2][3][4][5][6][7][8][9][10] Furthermore, as with other materials, at the nanoscale, metal-oxides can present interesting, important and tunable size-dependent optoelectronic properties. [7,11,12] Metal-oxides are generally characterized by very wide bandgaps, whereas CuO is a p-type low bandgap (∼1.2 eV in bulk form) and nontoxic material. [13][14][15][16][17][18] The possibility of manipulating the CuO bandgap, through quantum confinement, from 1.2 (bulk) to >2 eV [13,[16][17][18][19][20][21][22] is an exciting opportunity as it would make CuO a highly versatile and attractive material for a range ofThe copyright line for this article was changed on 20 April, 2017 after original online publication.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. applications; for instance, it would be possible to use CuO nanoparticles with tunable properties as absorber or transport/ blocking layers in photovoltaic devices.Various physical, chemical, and physicochemical techniques have been employed for synthesizing CuO nanostructures with varying size and shape. [16,18,20,23,24] However, these techniques suffer from numerous disadvantages including complex and time consuming steps, high temperatures, inert atmosphere, expensive source materials, toxic organic solvents, and surfactants. [23,25,26] Furthermore, the control of the resulting morphology, crystallinity, and agglomeration of the nanostructures is a significant challenge which demands additional cleaning steps to remove undesired by-products and chemical impurities or residues. [23,[26][27][28][29] The presence of surfactant or ligand chemistries is essential for minimizing particle coalescence and agglomeration during standard colloid synthesis; however, such chemistries impact significantly on the res...

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Section: Introductionmentioning

confidence: 99%

Ultra‐small CuO nanoparticles with tailored energy‐band diagram synthesized by a hybrid plasma‐liquid process

Velusamy

Liguori

Macías-Montero

et al. 2017

Plasma Processes & Polymers

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“…Compared to the common copper oxide powder, nano copper oxide shows better catalytic activity and selectivity [5]. CuO nanoparticles are prominent due to their diverse applications in superconductors, optical [6], electrical [7], nanofluids [8], catalytic [9], photocatalytic degradation [10], gas sensors, and in biosensors [11]. The factors including size, shape and composition of nanoparticles affects the interaction between the nanoparticles and living cells [12].…”

Section: Introductionmentioning

confidence: 99%

CuO NANOPARTICLES: SYNTHESIS, CHARACTERIZATION AND THEIR BACTERICIDAL EFFICACY

2017

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Objective: In the present study copper oxide (CuO) nanoparticles were synthesized and characterized. The antibacterial activity of CuO nanoparticles was carried out against Escherichia coli, Proteus vulgaris, Staphylococcus aureus and Streptococcus mutans. Methods:The synthesis was carried out by coprecipitation method using copper sulfate and sodium hydroxide as precursors. The synthesized copper oxide nanoparticles were characterized by using X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FT-IR), UV-vis spectroscopy and scanning electron microscope (SEM) with Dept of Physics, acharya Nagarjuna University, NH16, Nagarjuna Nagar, Guntur, Andhra Pradesh 522510 Email: peddikiranmayi@gmail.comEnergy Dispersive X-ray Analysis (EDX) techniques. Besides, this study determines the antibacterial activity and minimum inhibitory concentration (MIC) of CuO nanoparticles against gram-positive (Staphylococcus aureus and Streptococcus mutans) and gram-negative (E. coli and Proteus vulgaris) bacteria. Results:The average crystallite size of CuO nanoparticles was found to be 19 nm by X-ray diffraction. FT-IR spectrum exhibited vibrational modes at 432 cm -1 , 511 cm -1 and 611 cm -1 Keywords: CuO nanoparticles, XRD, FTIR, SEM, EDS, Antibacterial activity were assigned for Cu-O stretching vibration. According to UV-Vis spectrum, two bands were observed at 402 nm and 422 nm. ED's spectrum shows only elemental copper (Cu) and oxide (O) and no other elemental impurity was observed. The antimicrobial assay revealed that Proteus vulgaris showed a maximum zone of inhibition (37 mm) at 50 mg/ml concentration of CuO nanoparticles. Conclusion:In conclusion, copper oxide is a good antibacterial agent against both gram positive and gram-negative organisms.

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“…Moreover, the narrow band gap of CuO (1.2 eV) means a high electron conductivity [10], which is conductive to make most injected electrons shuttle easily to emission sites and diminish the voltage drop along the CuO emitters, resulting in the enhancement of the effective field at the emitter tip. Up this point, various CuO nanostructures including nanorods, nanofibers, and nanowires have been developed for field emitters, and some significant progresses have been achieved [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Enhanced electron field emission from CuO nanoplate arrays decorated with Au nanoparticles

Zhang

et al. 2015

Appl. Phys. A

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A simple and controllable method was reported for the decoration of CuO nanoplate arrays with Au nanoparticles. It had been achieved through the reaction between Sn 2? and AuCl 4 -in the presence of CuO nanoplate arrays. The structure and electron field emission properties of CuO nanoplate arrays decorated with different amounts of Au nanoparticles were investigated. The results demonstrated a remarkable enhancement of field emission performance of CuO nanoplate arrays decorated with Au nanoparticles. The effect of Au amount on the field emission performance was studied in detail, and excellent field emission properties such as a low turn-on electric field of 6.7 V/lm and a high field enhancement factor of 516 could be realized from the optimized sample. On the basis of experimental results, a possible mechanism for the formation of the CuO nanoplate arrays decorated with Au nanoparticles was speculated.

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Synthesis and optical properties of colloidal CuO nanoparticles

Cited by 184 publications

References 48 publications

Ultra‐small CuO nanoparticles with tailored energy‐band diagram synthesized by a hybrid plasma‐liquid process

Ultra‐small CuO nanoparticles with tailored energy‐band diagram synthesized by a hybrid plasma‐liquid process

CuO NANOPARTICLES: SYNTHESIS, CHARACTERIZATION AND THEIR BACTERICIDAL EFFICACY

Enhanced electron field emission from CuO nanoplate arrays decorated with Au nanoparticles

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