On the origin of white photoluminescence from ZnO nanocones/porous silicon heterostructures at room temperature

Marin, Oscar; Grinblat, Gustavo; Gennaro, Ana María; Tirado, Mónica; Koropecki, R. R.; Comedi, D.

doi:10.1016/j.spmi.2014.12.016

Cited by 25 publications

(23 citation statements)

References 46 publications

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“…Nevertheless, for the green luminescent band (GL), it has been reported to be originated from oxygen vacancies (Vo). However, the presence of both GL and YL in the same samples suggests a common origin for them 28 . We will assume that the formation of such defects occurs during the growth process.…”

Section: Resultsmentioning

confidence: 89%

Synthesis of ZnO nanowires and impacts of their orientation and defects on their gas sensing properties

Roso

Güell

Martínez‐Alanis

et al. 2016

Sensors and Actuators B: Chemical

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ZnO nanowires (NWs) oriented in three different directions were synthesized via the vapour-liquid-solid technique over c-, r-and a-plane sapphire substrates. Gas sensing properties of these samples against reducing and oxidizing gases were examined. ZnO NWs grown on the c-plane substrate showed the highest response to oxidizing gases (NO 2 ), while those grown on the a-plane substrate were more responsive to reducing one (ethanol). According to the insights gained by photoluminescence studies, the distinct responses were clearly correlated with the quantity and type of defects present in the material, and ultimately, relating the orientation of the different ZnO NWs sensors to their gas sensing characteristics, showing a possible rational strategy to tailor oxide nanomaterials for gas sensing applications.

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Section: Resultsmentioning

confidence: 89%

Synthesis of ZnO nanowires and impacts of their orientation and defects on their gas sensing properties

Roso

Güell

Martínez‐Alanis

et al. 2016

Sensors and Actuators B: Chemical

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“…Fabrication details are described in a previous report [9]. The annealing processes were carried out in a quartz tube placed in a horizontal tubular furnace under constant Ar and O 2 flow rates.…”

Section: Methodsmentioning

confidence: 99%

White light from annealed porous silicon: Broadband emission from violet to the near infrared

et al. 2015

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“…The p-type PSi/ZnO nanocomposites demonstrate an intensive white PL emission with a strong "shoulder-shape" contribution in the 400-600 nm region, and a weak Infra-red (IR) emission in the 800-900 nm region. The "shoulder-shape" PL in the visible range probably originates from the complex mechanism of the recombination emission through defect levels of ZnO, which may be attributed to radiative recombination at single and double-charged oxygen vacancy (Vo + , Vo ++ ) sites [35,53]. However, the full interpretation and explanation of observed PL will be the aim of future research.…”

Section: Optical and Biosensing Propertiesmentioning

confidence: 98%

Porous Silicon-Zinc Oxide Nanocomposites Prepared by Atomic Layer Deposition for Biophotonic Applications

et al. 2020

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In the current research, a porous silicon/zinc oxide (PSi/ZnO) nanocomposite produced by a combination of metal-assisted chemical etching (MACE) and atomic layer deposition (ALD) methods is presented. The applicability of the composite for biophotonics (optical biosensing) was investigated. To characterize the structural and optical properties of the produced PSi/ZnO nanocomposites, several studies were performed: scanning and transmission electron microscopy (SEM/TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), diffuse reflectance, and photoluminescence (PL). It was found that the ALD ZnO layer fully covers the PSi, and it possesses a polycrystalline wurtzite structure. The effect of the number of ALD cycles and the type of Si doping on the optical properties of nanocomposites was determined. PL measurements showed a “shoulder-shape” emission in the visible range. The mechanisms of the observed PL were discussed. It was demonstrated that the improved PL performance of the PSi/ZnO nanocomposites could be used for implementation in optical biosensor applications. Furthermore, the produced PSi/ZnO nanocomposite was tested for optical/PL biosensing towards mycotoxins (Aflatoxin B1) detection, confirming the applicability of the nanocomposites.

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On the origin of white photoluminescence from ZnO nanocones/porous silicon heterostructures at room temperature

Cited by 25 publications

References 46 publications

Synthesis of ZnO nanowires and impacts of their orientation and defects on their gas sensing properties

Synthesis of ZnO nanowires and impacts of their orientation and defects on their gas sensing properties

White light from annealed porous silicon: Broadband emission from violet to the near infrared

Porous Silicon-Zinc Oxide Nanocomposites Prepared by Atomic Layer Deposition for Biophotonic Applications

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