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Bellini, J. V.; Morelli, M. R.; Kiminami, R. H. G. A.

doi:10.1023/a:1016160204435

Cited by 28 publications

(9 citation statements)

References 7 publications

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“…Meanwhile, the type [Cu Zn + (3d 10 )] − reacted with ZnO intrinsic donors Zn i + (4s 1 ) to generate many (Cu Zn + Zn i ) 0 complexes in ZnO NR arrays without UV illumination, as shown in the following Eq. 7 35,36 The photo-ionization of this deep neutral complex in Eq. 7 was estimated by West et al 35 When the samples with CZO NRs are under the UV light illumination (the energy is more than 1.45 eV), the (Cu Zn + Zn i ) 0 complex would dissociate into another (Cu Zn + Zn i ) + complex and electrons, which could produce a higher photocurrent in the CZO NRs.…”

Section: Resultsmentioning

confidence: 99%

Fabrication and Characterization of UV Photodetectors with Cu-Doped ZnO Nanorod Arrays

Chu

et al. 2020

J. Electrochem. Soc.

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In this study, metal-semiconductor-metal (MSM) ultraviolet (UV) photodetectors (PDs) based on Cu-doped ZnO (CZO) nanorods (NRs) were fabricated and investigated. The CZO NRs were prepared on a Corning glass substrate by the chemical bath deposition (CBD) method with photolithography processes. It was found that the diameter and length of ZnO NRs increased with Cu-doped concentration. The X-ray diffraction (XRD) analysis showed that the growth of NR arrays along the c-axis was hexagonal wurtzite crystal. Compared with pure ZnO NRs, it can be seen that the main UV peak (378 nm) of photoluminescence (PL) spectra showed a blue-shift phenomenon with the increase of Cu-doped concentration. Additionally, it was found that the rise and recovery time of such a fabricated PD were shortened under the UV illumination. The UV sensing properties of the CZO PDs were improved since the trapping and de-trapping of electrons by Cu-related complexes were faster than the adsorption and desorption of oxygen molecules. With a 3 V applied bias and 380 nm UV illumination, the optimal sensitivity of our PDs is 196.6.

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Section: Resultsmentioning

confidence: 99%

Fabrication and Characterization of UV Photodetectors with Cu-Doped ZnO Nanorod Arrays

Chu

et al. 2020

J. Electrochem. Soc.

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“…The decomposition of CuAcH 2 O is greatly affected by the ambient atmosphere. In general, researchers [9][10][11][12][13][14][15][16][17][18] have been relating that in vacuum, N 2 or Ar, and in air, the main solid products have been Cu 0 and Cu 2 O, CuO or Cu 4 O 3 , respectively. The gaseous or volatile products have been mainly composed by acetone (CH 3 CH 3 CO), acetic acid (CH 3 COOH), acetaldehyde (CH 3 CHO), methane (CH 4 ), carbon dioxide (CO 2 ), and hydrogen gas (H 2 ).…”

Section: Resultsmentioning

confidence: 99%

“…Recently, scientific and technological efforts have been carried out through the utilisation of the freeze-drying technique to produce homogenous mixtures of powders such as oxides with copper(II) acetate monohydrate (CH 3 COO) 2 Cu . H 2 O (denoted CuAcH 2 O in the text for simplification) which have been used as precursors to preparation of ZnO-based varistors 10,11 .…”

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confidence: 99%

Thermal, Structural and Morphological Characterisation of Freeze-dried Copper(II) Acetate Monohydrate and its Solid Decomposition Products

et al. 2002

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In the present study the thermal decomposition of a freeze-dried copper(II) acetate monohydrate powder, (CH 3 COO) 2 Cu . H 2 O, (FDCuAcH 2 O), was analysed by a combination of high-temperature X-ray diffractometry; differential scanning calorimetry and thermogravimetry, up to 700 °C. The structure and morphology of the calcined freeze-dried powders were analysed by scanning electron microscopy and X-ray diffractometry. The results showed that FDAcCuH 2 O decomposes during heating in two stages: I) (25-225 °C) FDCuAcH 2 O dehydrates giving rise to copper(II) acetate, (CH 3 COO) 2 Cu, (AcCu), and II) (225-525 °C) AcCu decomposes to CuO through complex oxidation reactions of Cu and Cu 2 O, simultaneously. SEM showed that FDCuAcH 2 O powder has a scale-like morphology, which is created in the freezing stage and retained after freeze-drying. After calcination at 125 and 225 °C, clusters of elongated tubes (or filaments) compose the resulting powder (AcCu). Subsequent calcination at temperatures above 325 °C resulted in hard clusters of spheroid-like CuO particles.

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“…Several methods for the production of ZnO undoped and doped with various types of dopants (rare heart, metals, lanthanides, etc.) [14]- [17] have been described, such as, electrodeposition [18], evaporation [19], vapor-liquid-solid (VLS) growth [20], metal organic catalyst assisted vapor-phase epitaxy [21], aqueous thermal decomposition [22], microwave activated chemical bath deposition (MW-CBD) [23], chemical bath deposition (CBD) [24], surfactantassisted hydrothermal method [25], solution combustion [26] etc. This last method is more convenient than other because it is very fast, and less expensive; it has an easier composition control, and coating can be deposited on large area etc.…”

Section: Introductionmentioning

confidence: 99%

Quenching Photoluminescence of Eu(III) by Cu(II) in ZnO:Eu3++Cu2+ Compounds by Solution Combustion Method

López-Romero¹,

Jiménez²,

Garcı́a-Hipólito³

2016

WJCMP

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In this study Cu 2+ +Eu 3+ co-doped ZnO(ZnO/Cu 2+ +Eu 3+ ) solid solution powders were synthesized by solution combustion method using as oxidant agent zinc nitrate hexahydrate and as fuel urea; the Cu 2+ concentrations were 0, 1, 2, 3, 10, and 20 %Wt; the Eu 3+ ion concentration was fixed in 3%Wt. The samples after were annealed at 900˚C by 20 h in air. The structural results showed the largely presence of a wurtzite solid solution of Cu 2+ +Eu 3+ doped ZnO, at high Cu 2+ doping CuO and Eu 2 CuO 4 phases are also present. Morphological properties were analyzed using scanning electron microscopy (SEM) technique. However it is important to remark that the Cu 2+ ions suppress the Eu 3+ ion photoluminescence (PL) by means of an overlap mechanism between Cu 2+ absorption band and Eu 3+ emission band (e.g. 5 D 0 → 7 F 2 ) of the Eu 3+ emission spectra.

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Cited by 28 publications

References 7 publications

Fabrication and Characterization of UV Photodetectors with Cu-Doped ZnO Nanorod Arrays

Fabrication and Characterization of UV Photodetectors with Cu-Doped ZnO Nanorod Arrays

Thermal, Structural and Morphological Characterisation of Freeze-dried Copper(II) Acetate Monohydrate and its Solid Decomposition Products

Quenching Photoluminescence of Eu(III) by Cu(II) in ZnO:Eu3++Cu2+ Compounds by Solution Combustion Method

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