Tuning the photocatalytic activity of nanocomposite ZnO nanorods by shape-controlling the bimetallic AuAg nanoparticles

Putri, Anita Eka; Roza, Liszulfah; Budi, Setia; Umar, Akrajas Ali; Fauzia, Vivi

doi:10.1016/j.apsusc.2020.147847

Cited by 29 publications

(10 citation statements)

References 44 publications

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“…Figure displays the narrow-scan X-ray photoelectron spectroscopy (XPS) spectrum of ZnO/MoS 2 QDs and we make the following observations. The Zn 2p peaks comprise Zn 2p 2/3 and Zn 2p 1/2 peaks located at 1021.49 and 1044.49 eV, respectively, representing crystalline ZnO (Figure a). The O 1s peaks comprise four peaks centered at 530.0, 530.9, 531.6, and 532.2 eV.…”

Section: Resultsmentioning

confidence: 99%

MoSe₂ Quantum Dots Enhance the Performance of ZnO Nanostructure-Based UV Photodetectors

Putri,

Dwiputra,

Winata

et al. 2024

ACS Appl. Nano Mater.

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Zinc oxide (ZnO) nanostructures are extensively used as active materials for ultraviolet (UV) photodetectors, but the high dark current arising from intrinsic defects limits their performance. An emerging strategy to alleviate such problems includes the formation of heterostructures with transition metal dichalcogenides (TMDs), which until today have been limited to their two-dimensional structures, leaving the superior physicochemical properties in their quantum dot (QD) configuration untapped. Here, we devise a strategy to reduce surface defects by decorating ZnO nanorods with MoSe2 QDs fabricated through pulsed-laser ablation, using a facile spin-coating method. Through various surface and optical characterizations, we confirm the formation of heterostructures, wherein MoSe2 reduces the number of vacancy defects in the ZnO. As a result, when used as a UV photodetector, the heterostructures exhibit a simultaneous 51% decrease in dark current and 79% increase in photocurrent, i.e., a 4-fold sensitivity compared to the pure ZnO counterpart. Our study presents a strategy to enhance UV photodetector efficiency by utilizing metal oxide/quantum dot heterostructures produced through a facile method. In a broader context, it underscores the efficacy of quantum dot-based heterostructures in optimizing optoelectronic devices.

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Section: Resultsmentioning

confidence: 99%

MoSe₂ Quantum Dots Enhance the Performance of ZnO Nanostructure-Based UV Photodetectors

Putri,

Dwiputra,

Winata

et al. 2024

ACS Appl. Nano Mater.

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“…Hence, the probability of the electron‐hole recombination is reduced, resulting in a suppression of the visible emission intensity originated from the ZnO. Due to the surface plasmon resonance (SPR) effect of AuNPs under full spectrum sunlight illumination, the electrons from the Au nanoparticle can be excited to the SPR states and transfer to the CB of ZnO as the frequency of the plasmon oscillation matches the incident light [36] . The excited electrons will further transfer back to the AuNP, thus improving the separation of the photo‐generated electron‐hole pairs.…”

Section: Resultsmentioning

confidence: 99%

Pyroelectric Synthesis of the Site‐Specific Au‐ZnO Nanorod Array

Wang

et al. 2021

ChemistrySelect

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This paper introduces an alternative approach for the synthesis of site-specific gold-zinc oxide (Au-ZnO) nanorod array through the pyroelectric approach. The hydrothermally grown ZnO nanorod array on the Si substrate is served as the pyroelectric catalyst. Under rapid temperature oscillation, the gold salt precursor is reduced into gold nanoparticles around the tip of ZnO nanorods in aqueous solution. The hybrid structure shows a significant photoluminescence quenching in the visible emission spectrum of ZnO, which is due to the interaction of ZnO and gold nanoparticles. A Rhodamine B (RhB) degradation test under full spectrum sunlight illumination is conducted to demonstrate the photocatalytic performance of the Au-ZnO nanorod array. The mechanism behind the hydrothermal growth of ZnO, pyroelectric reduction of gold nanoparticles, and photoluminescence quenching of Au-ZnO is discussed. The findings of this work offer possible ways to the sustainable use of thermal energy, including harvesting waste heat through pyroelectric effect, and the site-specific synthesis of various nanomaterials with enhanced photocatalytic degradation capability.

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“…Then, 3 solutions were prepared: 5 mM AgNO 3 , 5 mM HAuCl 4 , and 5 mM ZnNO 3 , and they were combined at a 1:1:1 ratio. Prior to absorbance readings, the solution was stirred for 12h at 60°C [18].…”

Section: Synthesis Of Au/zno/ag Nanoparticlesmentioning

confidence: 99%

Facile synthesis of Au/ZnO/Ag nanoparticles using Glechoma hederacea L. extract, and their activity against leukemia

Dobrucka

Romaniuk-Drapała

Kaczmarek

2021

Biomed Microdevices

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Metal combinations have been attracting the attention of scientists for some time. They usually exhibit new characteristics that are different from the ones possessed by their components. In this work, Au/ZnO/Ag nanoparticles were synthesized biologically using Glechoma hederacea L. extract. The synthesized Au/ZnO/Ag nanoparticles were characterized by UV-Vis, Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), Transmission electron microscopy (TEM), and Atomic Force Microscopy (AFM). The microscopic methods confirmed the presence of spherical nanoparticles of 50–70 nm. The influence of biologically synthesized Au/ZnO/Ag nanoparticles on the vitality of human cells was evaluated in vitro with the use of established human Acute T Cell Leukemia cell line, Jurkat (ATCC® TIB-152™), as well as mononuclear cells isolated from peripheral blood (PBMC) of voluntary donors. Cell survival and the half-maximal inhibitory concentration index (IC50) were analyzed by the MTT test. The studies showed that the total loss of cell viability occurred at the Au/ZnO/Ag nanoparticle concentration range of 10 µmol–50 µmol. The use of Au/ZnO/Ag nanoparticles at the concentration of 100 µmol eliminated almost all living cells from the culture in 24h. The above observation confirms the result obtained during the MTT test.

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Tuning the photocatalytic activity of nanocomposite ZnO nanorods by shape-controlling the bimetallic AuAg nanoparticles

Cited by 29 publications

References 44 publications

MoSe₂ Quantum Dots Enhance the Performance of ZnO Nanostructure-Based UV Photodetectors

MoSe₂ Quantum Dots Enhance the Performance of ZnO Nanostructure-Based UV Photodetectors

Pyroelectric Synthesis of the Site‐Specific Au‐ZnO Nanorod Array

Facile synthesis of Au/ZnO/Ag nanoparticles using Glechoma hederacea L. extract, and their activity against leukemia

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Tuning the photocatalytic activity of nanocomposite ZnO nanorods by shape-controlling the bimetallic AuAg nanoparticles

Cited by 29 publications

References 44 publications

MoSe2 Quantum Dots Enhance the Performance of ZnO Nanostructure-Based UV Photodetectors

MoSe2 Quantum Dots Enhance the Performance of ZnO Nanostructure-Based UV Photodetectors

Pyroelectric Synthesis of the Site‐Specific Au‐ZnO Nanorod Array

Facile synthesis of Au/ZnO/Ag nanoparticles using Glechoma hederacea L. extract, and their activity against leukemia

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Product

Resources

About

MoSe₂ Quantum Dots Enhance the Performance of ZnO Nanostructure-Based UV Photodetectors

MoSe₂ Quantum Dots Enhance the Performance of ZnO Nanostructure-Based UV Photodetectors