The interplay between Mn valence and the optical response of ZnMnO thin films

Ianhez-Pereira, Camila; Onofre, Y.J.; Magon, Cláudio José; Rodrigues, Ariano De Giovanni; Godoy, Marcio Peron Franco de

doi:10.1007/s00339-020-03511-8

Cited by 14 publications

(6 citation statements)

References 36 publications

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“…Considering the definition of molarity (M) as the solute number of mols in a volume of 1 liter, the low molarity (M) precursor solution (M = 4 × 10 −3 mol/L) consists of solid silver nitrate (AgNO 3 by Synth, with a molar mass of 169.87 g/mol) as solute diluted in distilled water. The growth is based on cycles described elsewhere [18], and the low molarity condition tends to increase the crystallinity of films grown by spray pyrolysis [19]. Each cycle has duration of 2 min, and the growth starts with the deposition of layers at 300 • C by atomized microdroplets formed in a precursor flux of 0.25 mL/min.…”

Section: Methodsmentioning

confidence: 99%

“…In the case of zinc oxide, we recently demonstrated the influence of low molarities in the growth of transparent thin films, which are well oriented at the c-axis even in an amorphous substrate, such as soda-lime glass [19]. In addition, the technique enables the formation of doped layers and alloys with Cd, Co, or Mn [18,26,27] in systematic and reproducible processes. For the Ag/AgO film obtained by spray-pyrolysis, a possible growth route is considered if the dissociation of silver nitrate obeys AgNO 3 → AgO + 1 2 N 2 + O 2 in such a way that an aqueous vapor atmosphere near the substrate favors a stoichiometric relation with Ag 2+ rather than Ag 1+ , which occurs in a deficient oxygen environment.…”

Section: Structural Characterizationmentioning

confidence: 99%

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The Negative Photoconductivity of Ag/AgO Grown by Spray-Pyrolysis

et al. 2022

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The main goal of this work is to provide a general description of the negative photoconductivity effect observed in Ag/AgO films grown by the spray-pyrolysis technique. X-ray diffractograms display hybrid films with high texturized AgO and metallic Ag phases. Scanning electron microscopy images show small Ag particles on the surface. Due to its surface nature, X-ray photoelectron spectroscopy revealed the predominance of the metallic character of Ag 3d spectra as compared to Ag2+. Negative photoconductivity with photoresponse in the order of seconds is observed under several wavelengths of excitation. We found that the amplitude of the negative photoresponse is strongly dependent on the optical absorbance and enhanced by surface plasmon resonance. The low-cost technique employed and the special features regarding negative photoconductivity provide an exciting platform for developing optical-electronic devices with low power consumption.

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Section: Methodsmentioning

confidence: 99%

Section: Structural Characterizationmentioning

confidence: 99%

The Negative Photoconductivity of Ag/AgO Grown by Spray-Pyrolysis

et al. 2022

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“…Figure E shows the XPS spectra for zinc (Zn 2p)Zn 2p 3/2 and Zn 2p 1/2 at 1025.03 and 1048.14 eV. As in the case of selenium, two characteristic peaks at 3d 5/2 and 3d 1/2 spin orbitals are observed (Figure F). , The peak at 54.122 eV corresponding to Se 3d 5/2 is due to the bonding of Se with Cd, whereas the peak obtained at 55.24 eV corresponding to Se 3d 3/2 is attributed to the presence of selenium ion (Se + ) . These results confirm that the CdSe/ZnS QDs are present in good combination with the f -MWCNT matrix.…”

Section: Resultsmentioning

confidence: 85%

Synthesis of Water-Soluble Cadmium Selenide/Zinc Sulfide Quantum Dots on Functionalized Multiwalled Carbon Nanotubes for Efficient Covalent Synergism in Determining Environmental Hazardous Phenolic Compounds

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Ganguly

Santhan

et al. 2022

ACS Sustainable Chem. Eng.

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Increasing pollution and ecological imbalance have accentuated the need to develop sensors through an efficient technique. Typically, the core−shell nanocrystals of cadmium selenide/zinc sulfide (CdSe/ZnS) with functionalized multiwalled carbon nanotubes (f-MWCNTs) are used for developing an efficient electrochemical sensor that simultaneously detects 4-aminophenol (4-AP) and 4nitrophenol (4-NP). The composite network formed by CdSe/ZnS quantum dots with the f-MWCNTs (CdSe/ZnS QDs @ f-MWCNT) behaves as an excellent electrocatalyst and provides a transportation pathway by engendering the electron− hole pair. The sensor exhibits low detection limit values of 34.8 and 17.7 nM for detection of 4-AP and 4-NP, respectively. The sensor also showed excellent sensitivity at a linear working range of 0.149−510 μM concentration for both the analytes. Additionally, the study also shows the potential for commercial feasibility of the asprepared sensor by acquiring a satisfactory recovery percentage of the analytes in realtime biological and environmental sample analyses.

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“…1(d) reveal the presence of Zn 2p 3/2 and Zn 2p 1/2 with peaks at 1021.6 eV and 1044.7 eV with a separation of about 23 eV, respectively. 40,41…”

Section: Resultsmentioning

confidence: 99%