Plasmonic-Active Nanostructured Thin Films

Bhattarai, Jay K.; Maruf, Helal Uddin; Stine, Keith J.

doi:10.3390/pr8010115

Cited by 21 publications

(11 citation statements)

References 80 publications

(89 reference statements)

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“…Noble metal NPs absorb light with a specific wavelength, leading to their free electrons resonate with the oscillating field of incident light. This collective electron oscillation causes a charge separation at particle surface with respect to positively charged metallic core ( Figure 6 b) [ 68 ]. SPR absorption induces rapid heating of metal NPs under visible light [ 69 , 70 , 71 ].…”

Section: Structure-dependent Photocatalytic Activitymentioning

confidence: 99%

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Interactions of Zinc Oxide Nanostructures with Mammalian Cells: Cytotoxicity and Photocatalytic Toxicity

Liao

Jin

et al. 2020

IJMS

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This article presents a state-of-the-art review and analysis of literature studies on the morphological structure, fabrication, cytotoxicity, and photocatalytic toxicity of zinc oxide nanostructures (nZnO) of mammalian cells. nZnO with different morphologies, e.g., quantum dots, nanoparticles, nanorods, and nanotetrapods are toxic to a wide variety of mammalian cell lines due to in vitro cell–material interactions. Several mechanisms responsible for in vitro cytotoxicity have been proposed. These include the penetration of nZnO into the cytoplasm, generating reactive oxygen species (ROS) that degrade mitochondrial function, induce endoplasmic reticulum stress, and damage deoxyribonucleic acid (DNA), lipid, and protein molecules. Otherwise, nZnO dissolve extracellularly into zinc ions and the subsequent diffusion of ions into the cytoplasm can create ROS. Furthermore, internalization of nZnO and localization in acidic lysosomes result in their dissolution into zinc ions, producing ROS too in cytoplasm. These ROS-mediated responses induce caspase-dependent apoptosis via the activation of B-cell lymphoma 2 (Bcl2), Bcl2-associated X protein (Bax), CCAAT/enhancer-binding protein homologous protein (chop), and phosphoprotein p53 gene expressions. In vivo studies on a mouse model reveal the adverse impacts of nZnO on internal organs through different administration routes. The administration of ZnO nanoparticles into mice via intraperitoneal instillation and intravenous injection facilitates their accumulation in target organs, such as the liver, spleen, and lung. ZnO is a semiconductor with a large bandgap showing photocatalytic behavior under ultraviolet (UV) light irradiation. As such, photogenerated electron–hole pairs react with adsorbed oxygen and water molecules to produce ROS. So, the ROS-mediated selective killing for human tumor cells is beneficial for cancer treatment in photodynamic therapy. The photoinduced effects of noble metal doped nZnO for creating ROS under UV and visible light for killing cancer cells are also addressed.

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Section: Structure-dependent Photocatalytic Activitymentioning

confidence: 99%

“…( b ) Schematic illustration of oscillation of free electrons of noble metal NPs with electric field of incident light. Reproduced from [ 68 ] under the Creative Commons Attribution license.…”

Section: Figurementioning

confidence: 99%

Interactions of Zinc Oxide Nanostructures with Mammalian Cells: Cytotoxicity and Photocatalytic Toxicity

Liao

Jin

et al. 2020

IJMS

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“…The sensitivity shows two sensitivity regions, low and high with different sensitivity values; 17.33 nm/RIU and 437.5 nm/RIU respectively. Our plasmonic refractive index sensor is also characterized, taking into account the variation in size and shapes of the deposited Au nanostructures, by determining the figure of Merit (𝐹𝑂𝑀) which accurately describe the performance of our sensor in respect to the resonance peak line-width, using the following equation [9][31]:…”

Section: (A) (B) (C) (D)mentioning

confidence: 99%

“…The plasmonics effect is normally characterized by a couple of inherent factors like the metal's type, structure, and dimension. However, another important factor, which highly affects the plasmonic resonance absorption, is the refractive index of the media surrounding the metal nanostructures [8] [9]. The influence of this factor can normally be recognized by causing a shift in the plasmonic absorption peak with any slight variation in the refractive index of the surrounding medium [10].…”

Section: Introductionmentioning

confidence: 99%

Nanoplasmonic Sensing Using Gold Nanostructures

Thajeel¹,

Ibrahem²,

Ahmed³

2022

JASN

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Nanoplasmonic sensing, based on the plasmonic resonance absorption of thin, irregularly-shaped Au nanostructures film, with a starting thickness of about 15 nm (±3 nm) sputtered on a quartz substrate, is used to monitor the CeO2 NPs (with an average diameter of 50 nm) film refractive index variations using different film thicknesses (90 nm, 146 nm, 172 nm, and 196 nm). Increasing the film thickness of solution-processed CeO2 NPs film, with layer-by-layer deposition on top of Au nanostructures, shows a significant redshift in the plasmonic resonance absorption of the plasmonic metal, from 580 nm to 611 nm. Such an increase is related to the change in the building microstructure of the semiconductor's film which is reflected in changing its refractive index. Plasmonic surface refractive index sensitivity of 437.5 nm/RIU with FOM of 4.2 has been recorded. Such a sensing technique offers a large potential for developing cost-effective plasmonic nanosensing devices for clinical applications. This sensor structure is versatile and can be utilized to sense and monitor a large variety of materials and chemicals.

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“…The review by Bhattarai et al [10] describes the growing field of nanostructured thin films with plasmonic properties such as localized surface plasmon resonance, propogating surface plasmon resonance and surface-enhanced Raman responses. The tuning of the nanoscale features of these films, referred to as plasmonic active thin films (PANTFs), can vary the plasmon wavelengths and refractive index sensitivity when used in biosensor applications.…”

mentioning

confidence: 99%