Propeller‐Shaped ZnO Nanostructures Obtained by Chemical Vapor Deposition: Photoluminescence and Photocatalytic Properties

Wang, S. L.; Zhu, Huiwen; Tang, W.H.; Li, P. G.

doi:10.1155/2012/594290

Cited by 12 publications

(8 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From the HRTEM image ( Fig. 2c ), the inter-planar distance on the periphery of core UCN was measured to be 0.28 nm, corresponding to the (100) crystal plane of hexagonal phase ZnO 21 22 . This observation confirms that ZnO is coated on the core UCN, yielding CSNPs.…”

Section: Resultsmentioning

confidence: 99%

Core – shell upconversion nanoparticle – semiconductor heterostructures for photodynamic therapy

Dou

Rengaramchandran

Selvan

et al. 2015

Sci Rep

View full text Add to dashboard Cite

Core-shell nanoparticles (CSNPs) with diverse chemical compositions have been attracting greater attention in recent years. However, it has been a challenge to develop CSNPs with different crystal structures due to the lattice mismatch of the nanocrystals. Here we report a rational design of core-shell heterostructure consisting of NaYF4:Yb,Tm upconversion nanoparticle (UCN) as the core and ZnO semiconductor as the shell for potential application in photodynamic therapy (PDT). The core-shell architecture (confirmed by TEM and STEM) enables for improving the loading efficiency of photosensitizer (ZnO) as the semiconductor is directly coated on the UCN core. Importantly, UCN acts as a transducer to sensitize ZnO and trigger the generation of cytotoxic reactive oxygen species (ROS) to induce cancer cell death. We also present a firefly luciferase (FLuc) reporter gene based molecular biosensor (ARE-FLuc) to measure the antioxidant signaling response activated in cells during the release of ROS in response to the exposure of CSNPs under 980 nm NIR light. The breast cancer cells (MDA-MB-231 and 4T1) exposed to CSNPs showed significant release of ROS as measured by aminophenyl fluorescein (APF) and ARE-FLuc luciferase assays, and ~45% cancer cell death as measured by MTT assay, when illuminated with 980 nm NIR light.

show abstract

Section: Resultsmentioning

confidence: 99%

Core – shell upconversion nanoparticle – semiconductor heterostructures for photodynamic therapy

Dou

Rengaramchandran

Selvan

et al. 2015

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Examples of 3D structures of zinc oxide include flower, dandelion, snowflakes, coniferous urchin-like, and so forth [4,[37][38][39][40]. ZnO with a 3D structure has been obtained by Haldar et al [41], who applied the method of chemical condensation of vapours using zinc acetate as a precursor.…”

Section: Introductionmentioning

confidence: 99%

Structural Characterisation of ZnO Particles Obtained by the Emulsion Precipitation Method

Kołodziejczak-Radzimska

Markiewicz

Jesionowski

2012

Journal of Nanomaterials

146

View full text Add to dashboard Cite

Zinc oxide was obtained by precipitation in an emulsion system with zinc acetate used as a precursor of ZnO and potassium hydroxide or sodium hydroxide as a precipitating agent. The cyclohexane, as an organic phase, and a nonionic surfactant mixture were also used for preparation of the emulsion. By applying modifications of the ZnO precipitation process, such as changing the precipitating agent, composition of substrates, and the rate of substrate dosing, some interesting structures of ZnO particles were obtained. The morphology of the modified samples was analysed based on SEM (scanning electron microscope) and TEM (transmission electron microscope) images. Moreover the samples were characterised by determination of their dispersive properties using the noninvasive back scattering method (NIBS), adsorption parameters (BET), and crystalline structure (XRD). Thermogravimetric analysis (TG) as well as infrared spectrophotometry (FT-IR) was also applied. For selected samples their electrical properties (dielectric permittivity and electric conductivity) were also measured. The zinc oxide obtained consisted of particles in the shapes of solids, ellipsoids, rods, and flakes, with size ranging from 164 to 2670 nm and showed well-developed surface area with values as high as 20 m2/g.

show abstract

“…As a result of the oxy/redox processes, complete mineralization of the contaminants occurs [18]. Various synthesis methods of photo-catalytically active ZnO nanoparticles (ZNP) have been applied: thermal evaporation [19], chemical vapor deposition (CVD) [20], mechano-chemical preparation [21], sol-gel [22] spray pyrolysis [23], hydrothermal synthesis [24], precipitation [25], etc. Most of the abovementioned conventional procedures are complex, based on the application of toxic reducing and stabilizing agents.…”

Section: Introductionmentioning

confidence: 99%

Modified Approach Using Mentha arvensis in the Synthesis of ZnO Nanoparticles—Textural, Structural, and Photocatalytic Properties

et al. 2022

View full text Add to dashboard Cite

Zinc oxide arouses considerable interest since it has many applications—in microelectronics, environmental decontaminations, biomedicine, photocatalysis, corrosion, etc. The present investigation describes the green synthesis of nanosized ZnO particles using a low-cost, ecologically friendly approach compared to the classical methods, which are aimed at limiting their harmful effects on the environment. In this study, ZnO nanoparticles were prepared using an extract of Mentha arvensis (MA) leaves as a stabilizing/reducing agent, followed by hydrothermal treatment at 180 °C. The resulting powder samples were characterized by X-ray diffraction (XRD) phase analysis, infrared spectroscopy (IRS), scanning electron microscopy (SEM), and electron paramagnetic resonance (EPR). The specific surface area and pore size distribution were measured by the Brunauer–Emmett–Taylor (BET) method. Electronic paramagnetic resonance spectra were recorded at room temperature and at 123 K by a JEOL JES-FA 100 EPR spectrometer. The intensity of the bands within the range of 400–1700 cm−1 for biosynthesized ZnO (BS-Zn) powders decreased with the increase in the Mentha arvensis extract concentration. Upon increasing the plant extract concentration, the relative proportion of mesopores in the BS-Zn samples also increased. It was established that the photocatalytic performance of the biosynthesized powders was dependent on the MA concentration in the precursor solution. According to EPR and PL analyses, it was proved that there was a presence of singly ionized oxygen vacancies (V0+) and zinc interstitials (Zni). The use of the plant extract led to changes in the morphology, phase composition, and structure of the ZnO particles, which were responsible for the increased photocatalytic rate of discoloration of Malachite Green dye.

show abstract

Propeller‐Shaped ZnO Nanostructures Obtained by Chemical Vapor Deposition: Photoluminescence and Photocatalytic Properties

Cited by 12 publications

References 38 publications

Core – shell upconversion nanoparticle – semiconductor heterostructures for photodynamic therapy

Core – shell upconversion nanoparticle – semiconductor heterostructures for photodynamic therapy

Structural Characterisation of ZnO Particles Obtained by the Emulsion Precipitation Method

Modified Approach Using Mentha arvensis in the Synthesis of ZnO Nanoparticles—Textural, Structural, and Photocatalytic Properties

Contact Info

Product

Resources

About