Luminescence and physical properties of copper doped CdO derived nanostructures

Benhaliliba, M.; Benouis, C.E.; Tiburcio‐Silver, A.; Yakuphanoğlu, F.; Ávila-García, A.; Tavira, A.; Romano-Trujillo, R.; Mouffak, Z.

doi:10.1016/j.jlumin.2012.03.044

Cited by 115 publications

(33 citation statements)

References 35 publications

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“…The positions of the additional spectral bands did not depend on temperature in the range 290-80 K [14]. A comparison of the experimental difference spectra with those in the literature [14,15] allowed them to be associated with emissions of cadmium oxide (CdO) and hydroxide [Cd(OH) 2 ] nanophases. The band with a maximum at 3.1 eV (Fig.…”

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confidence: 83%

“…The band with a maximum at 3.1 eV (Fig. 4b) corresponded to interband electronic transitions in CdO; additional bands with maxima at 1.88, 2.12, and 2.27 eV, to electronic transitions in deep levels due to defect centers [14]. Bands with maxima at 2.40 and 2.50 eV were associated with electronic transitions in deep levels of Cd(OH) 2 and interband electronic transitions in this material [15].…”

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confidence: 86%

“…Thus, PL and Raman spectra established that nanostructures formed on the surface of CdI 2 crystals included Cd(OH) 2 and CdO [14][15][16][17][18][19]. (2): low-frequency region (ν < 1000 cm -1 ) (a); high-frequency region (ν > 3000 cm -1 ) (b).…”

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confidence: 97%

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Formation and Optical Properties of CdI2 Nanostructures

et al. 2015

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Nano-sized structures (nanopores, nanoclusters, nanowires) that formed on van-der-Waals surfaces of CdI 2 during their curing in air under near-equilibrium thermodynamic conditions were found using atomic-force microscopy. A mechanism of nanocluster formation was proposed. They nucleated and grew in nano-sized pores. Aggregation of the nanoclusters gave rise to the formation of nanowires. Photoluminescence and Raman spectroscopy showed that the nanoclusters contained cadmium hydroxide [Cd(OH) 2 )] and oxide (CdO). A formation mechanism of these nanophases was proposed. Introduction.Research on nanostructures that is aimed at discovering materials with new functional properties that enable them to be used in modern devices and micro-and nanoelectronics is a critical area of modern semiconductor and dielectric physics. In this respect, layered crystals, the surfaces of which are characterized by elongated atomically smooth portions with a low density of dangling bonds [van-der-Waals (vdW) surfaces], are promising. This feature is responsible for their use as substrates for forming molecular, organic, and metallic nanostructures for preparing heterostructures by incoherent vdW-epitaxy as natural nanorelief standards in the metrology of nano-sized objects [1][2][3][4].At present, the formation and properties of nano-sized structures in narrow-bandgap layered A III B V crystals (GaSe, InSe) and alloys In x Se 1-x are under intense scrutiny [5][6][7][8]. Analogous investigations of wide-bandgap layered MX 2 halides are practically unknown. The surfaces of layered CdI 2 crystals grown from aqueous solutions were studied by microscopy [9][10][11][12][13]. Optical and tunneling (TEM) and scanning (SEM) electron microscopy revealed new spiral growth regions that were formed on the basal surfaces (0001) of CdI 2 , namely, steps of a height equal to the structure period c and multiples of c. The horizontal distance between steps was a multiple of lattice constant a [9-11]. Also, a detected mismatch between the height of the growth spiral and lattice period c was explained by the interaction of dangling bonds in the broken I-Cd-I layers (steps) with the crystal surface. This decreased the thickness of the structural bilayer unit I-Cd-I from 0.343 to 0.310 nm. The surface morphology of CdI 2 crystals grown from aqueous solution was investigated by atomic-force microscopy (AFM) and exhibited linear steps (terraces), depressions, and islets. The CdI 2 surface between these features was atomically smooth with relief non-uniformity of 10.2 and 4.7 Å [13].The goal of the present work was to establish the formation mechanism and the phase composition of nanostructures formed on vdW surfaces of CdI 2 crystals after storage in air under normal thermodynamic conditions (290 K, relative humidity 80%).Experimental. CdI 2 crystals were grown from the melt and the gas phase. Single crystals of CdI 2 were grown by the Bridgman-Stockbarger method from a melt that was purifi ed beforehand by zone refi nement. Simultaneously, thin singlecryst...

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confidence: 83%

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Formation and Optical Properties of CdI2 Nanostructures

et al. 2015

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“…In previous studies, the synthesis of Sn-doped CdO thin films [24], Bi 3? doped CdO thin films by sol-gel spin coating method [25], copper-doped CdO nanostructures [26], ZnO-doped CdO materials [27], titanium-doped CdO thin films [28], ZnO-CdO-TeO 2 system doped with the Tb 3? and Yb 3?…”

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confidence: 99%

Sm doping effect on structural, morphological, luminescence and antibacterial activity of CdO nanoparticles

Xavier

Ravichandran

Ravichandran³

et al. 2016

J Mater Sci: Mater Electron

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Undoped cadmium oxide along with samarium doped CdO are synthesized by simple soft precipitation method. Resulting precursor was calcined at 400°C for 2 h. As a result of heating, a pure material was produced. The obtained compound possesses a cubic crystalline structure at nanoscale. Also, FESEM image showed that the resulting material is composed of nanoparticles and its size decreases with increase of Sm doping relative with the particle size calculated from XRD. The photoluminescence shows the emission of violet and blue colour peaks and the peak at 468 nm which is responsible for a better antibacterial activity. The synthesized nanopowders are subjected to two different gram positive (Staphylococcus aureus and Enterococcus faecalis) and two different gram negative (Escherichia coli and Klebsiella pneumoniae) bacterial strains respectively. It is noted that there are high activity of the Sm doped CdO towards gram negative bacteria.

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“…Besides, CdO shows very high electrical conductivity even without doping due to the existence of shallow donors caused by intrinsic interstitial cadmium atoms and oxygen vacancies [9]. In previous studies, the synthesis of Sn-doped CdO thin films [10], Bi 3+ -doped CdO thin films by sol-gel spin coating method [11], copper-doped CdO nanostructures [12], ZnO-doped CdO materials [13], titanium-doped CdO thin films [14], ZnO-CdO-TeO 2 system doped with the Tb 3+ and Yb 3+ ions [15], N-doped CdO [16], samarium-, cerium-, europium-, Fe-, and Li-doped CdO nanocrystalline materials [17][18][19][20][21], In-doped CdO films [22], fluorine-doped CdO [23], gallium-doped CdO thin films [24], Gd-doped CdO thin films with different method, dopant amount and structural morphology [25], Li-Ni co-doped CdO thin films [18], aluminum-doped CdO thin films [26], fluorine-doped CdO Films [27] have been reported.…”

Section: Introductionmentioning

confidence: 99%

Sol–gel synthesis, characterization, and optical properties of Gd3+-doped CdO sub-micron materials

et al. 2013

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Highly crystalline Gd 3+ -doped cadmium oxide micro-structure was synthesized by calcining the obtained precursor of a sol-gel reaction. The reaction was carried out with cadmium nitrate (Cd(NO 3 ) 2 ·4H 2 O), gadolinium oxide, and ethylene glycol (C 2 H 6 O 2 ) reactants without any additives at 80°C for 2 h. The resulting gel was calcined at 900°C with increasing temperature rate of 15°C/min for 12 h in a furnace. As a result of heating, the organic section of the gel was removed, and the Gd 3+ -doped cadmium oxide micro-structure was produced. The obtained compound from the sol-gel technique possesses a cubic crystalline structure at a micro scale. XRD study indicates that the obtained Gd 3+-doped CdO has a cubic phase. Also, the SEM images showed that the resulting material is composed of particles with cluster structure. Also, FT-IR spectroscopy was employed to characterize the Gd 3+ -doped CdO micro-structures.

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Luminescence and physical properties of copper doped CdO derived nanostructures

Cited by 115 publications

References 35 publications

Formation and Optical Properties of CdI2 Nanostructures

Formation and Optical Properties of CdI2 Nanostructures

Sm doping effect on structural, morphological, luminescence and antibacterial activity of CdO nanoparticles

Sol–gel synthesis, characterization, and optical properties of Gd3+-doped CdO sub-micron materials

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