Synthesis and characterization of Fe3+ doped TiO2 nanoparticles and films and their performance for photocurrent response under UV illumination

Elghniji, Kais; Atyaoui, Atef; Livraghi, Stefano; Bousselmi, Latifa; Giamello, Elio; Ksibi, Mohamed

doi:10.1016/j.jallcom.2012.07.010

Cited by 74 publications

(47 citation statements)

References 61 publications

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“…The amount of iron ions extracted in this condition was lower than 15 % of the total amount for all the Fe-doped titania suggesting that iron ions were strongly coordinated at the surface or migrate in the sublayer of the particles. Fe 3+ ions have, in fact, a ionic radius similar to Ti 4+ and may, therefore, substitute them in the lattice (Elghniji et al 2012). As expected, the amount of removable iron slightly increased by increasing the loading.…”

Section: Structural Properties Of the Powders And Elemental Compositionsupporting

confidence: 71%

“…2A) for samples T A/R -Fe1 and T A/R -Fe2. Considering that no trace of segregated iron oxide was detected by XRD analysis in these two samples, such change in visible light absorption can be ascribed to the insertion of iron in the TiO 2 lattice (Elghniji et al 2012). The spectrum of T A/R -Fe3 is more complex and characterized by a step-like adsorption (at about 600 nm) indicating the overwhelming presence of iron oxide (Fe 2 O 3 ) particles, as already revealed by XRD spectrum and the color of the samples which turns to reddish (inset in Fig.…”

Section: Structural Properties Of the Powders And Elemental Compositionmentioning

confidence: 81%

“…In fact, it has been reported to both enhance electron/hole separation; thus, increasing the photocatalytic activity or increasing the rate of recombination of the charge carriers leading to a detrimental effect. The concentration of Fe 3+ ions has been shown to be a key factor since low loading increases the efficiency (Jin et al 2011;Yu et al 2010) while an high loading has generally the opposite effect (Elghniji et al 2012;Colmenares et al 2006;Wen et al 2012;Yu et al 2009;Rehman et al 2009;Fig. 7 Effect of the TiO 2 samples on the colony forming efficiency (CFE) on HaCaT cells exposed to 100 and 500 µg/mL of TiO 2 samples.…”

Section: Discussionmentioning

confidence: 99%

“…its electronic structure and distribution within the TiO 2 lattice. Recently, transition-metals, and particularly iron, rise an increasing interest since they may enhance the photo-efficiency of titania in the visible region; a property very useful in the manufacture of photocatalysts for environmental applications (Fujishima et al 2008;Elghniji et al 2012). The photocatalytic efficiency of iron-doped TiO 2 is dependent upon the synthetic routes and the extent of loading.…”

Section: Introductionmentioning

confidence: 99%

“…The photocatalytic efficiency of iron-doped TiO 2 is dependent upon the synthetic routes and the extent of loading. In fact, while an enhancement of the photocatalytic activity is observed for low loadings (Jin et al 2011;Yu et al 2010), high loadings may have a detrimental effect (Elghniji et al 2012; Colmenares et al 2006;Wen et al 2012;Yu et al 2009;Rehman et al 2009;Fabrega et al 2010). Manganese has also been proposed to decrease the photoreactivity of TiO 2 (Wakefield et al 2004).…”

Section: Introductionmentioning

confidence: 99%

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Inhibition of the ROS-mediated cytotoxicity and genotoxicity of nano-TiO2 toward human keratinocyte cells by iron doping

et al. 2014

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Inhibition of the ROS-mediated cytotoxicity and genotoxicity of nano-TiO 2 toward human keratinocyte cells by iron doping J Nanopart Res (2014) Nano-TiO 2 powders are widely used in sunscreen lotions as UV filters in combination with other substances. The activation of TiO 2 by UV rays leads to the release of reactive oxygen species (ROS, e.g., hydroxyl radicals and singlet oxygen) which are potentially harmful. For this reason the TiO 2 particles are generally coated with inert materials (e.g., silica or alumina) that inhibit such reactivity. Alternatively, the release of ROS may be inhibited by introducing in the TiO 2 lattice doping elements. In the present study we report a new modification consisting in a wet impregnation of TiO 2 with iron salts followed by a thermal treatment that results in an inhibition of the surface reactivity. The insertion of iron ions also gradually reduces the ability of photo-activated TiO 2 to cleave DNA and proteins. At the same time, a clear inhibition of cyto-and geno-toxicity toward human (HaCaT) keratinocytes was observed. The data presented herein suggest the insertion of Fe 3+ ions at the surface of nano-TiO 2 as a promising strategy to reduce the photo-induced toxicity of nano-TiO 2 powders.

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Section: Structural Properties Of the Powders And Elemental Compositionsupporting

confidence: 71%

Section: Structural Properties Of the Powders And Elemental Compositionmentioning

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Inhibition of the ROS-mediated cytotoxicity and genotoxicity of nano-TiO2 toward human keratinocyte cells by iron doping

et al. 2014

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A Nano‐Biohybrid‐Based Bio‐Solar Cell to Regulate the Electrical Signal Transmission to Living Cells for Biomedical Application

Lim

Shin

et al. 2023

Advanced Materials

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Bio‐solar cells have been studied as sustainable and biocompatible energy sources with significant potential for biomedical applications. However, they are composed of light‐harvesting biomolecules with narrow absorption wavelengths and weak transient photocurrent generation. In this study, a nanobiohybrid‐based bio‐solar cell composed of bacteriorhodopsin, chlorophyllin, and Ni/TiO2 nanoparticles is developed for the first time to overcome the current limitations and verify the possibility of biomedical applications. Bacteriorhodopsin and chlorophyllin are introduced as light‐harvesting biomolecules to broaden the absorption wavelength. As a photocatalyst, Ni/TiO2 nanoparticles are introduced to generate a photocurrent and amplify the photocurrent generated by the biomolecules. The developed bio‐solar cell absorbed a broad range of visible wavelengths and generated an amplified stationary photocurrent density (152.6 nA/cm2) with a long lifetime (up to 1 month). Besides, the electrophysiological signals of muscle cells at neuromuscular junctions are precisely regulated by motor neurons excited by the photocurrent of the bio‐solar cell, indicating that the bio‐solar cell can control living cells by signal transmission through other types of living cells. The proposed nanobiohybrid‐based bio‐solar cell can be used as a sustainable and biocompatible energy source for the development of wearable and implantable biodevices and bioelectronic medicines for humans.This article is protected by copyright. All rights reserved

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Research Frontiers in Energy‐Related Materials and Applications for 2020–2030

Blay

Galian

Mureşan

et al. 2020

Advanced Sustainable Systems

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structure was found for the first time in a mineral composed by CaTiO 3 in 1839. Since then, multiple metal oxide perovskites (AMO 3 ) were developed, which have interesting properties for ferroelectric, superconductive, and pyroelectric applications. Metal halide perovskites (X is a halide anion such as Cl − , Br − , or I − ), which were developed later, display promising semiconducting properties. In particular, lead halide perovskites (APbX 3 ) are the most widely studied perovskite composition and are classified according to the A cation into hybrid perovskites (methylammonium bromide, MA or formamidinium, FA) and all-inorganic perovskites (cesium, Cs). [2] The electronic properties of the perovskites are related to the M-X bond, while the size of the A cation can introduce crystal distortion and change the symmetry of the ideal cubic crystal structure. [3] Interestingly, by using a large A organic cation, low-dimensional halide perovskites can be formed, including 2D sheets, 1D chains, or 0D clusters. [4] Lead halide perovskites are revolutionizing photovoltaic technology thank to their outstanding optical and electronic properties, low cost, and simple preparation. Compared to silicon-based technology, perovskites are prepared from more abundant and low-cost precursors. The superior performance and high efficiency of perovskite-based solar cells (PSC) are due to i) high optical absorption coefficient, ii) long carrier diffusion length This article delineates the state of the art for several materials used in the harvest, conversion, and storage of energy, and analyzes the challenges to be overcome in the decade ahead for them to reach the market and benefit society. The materials covered have had a special interest in recent years and include perovskites, materials for batteries and supercapacitors, graphene, and materials for hydrogen production and storage. Looking at the common challenges for these different systems, scientists in basic research should carefully consider commercial requirements when designing new materials. These include cost and ease of synthesis, abundance of precursors, recyclability of spent devices, toxicity, and stability. Improvements in these areas deserve more attention, as they can help bridge the gap for these technologies and facilitate the creation of partnerships between academia and industry. These improvements should be pursued in parallel with the design of novel compositions, nanostructures, and devices, which have led most interest during the past decade. Research groups are encouraged to adopt a cross-disciplinary mindset, which may allow more efficient use of existing knowledge and facilitate breakthrough innovation in both basic and applied research of energy-related materials.

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Synthesis and characterization of Fe3+ doped TiO2 nanoparticles and films and their performance for photocurrent response under UV illumination

Cited by 74 publications

References 61 publications

Inhibition of the ROS-mediated cytotoxicity and genotoxicity of nano-TiO2 toward human keratinocyte cells by iron doping

Inhibition of the ROS-mediated cytotoxicity and genotoxicity of nano-TiO2 toward human keratinocyte cells by iron doping

A Nano‐Biohybrid‐Based Bio‐Solar Cell to Regulate the Electrical Signal Transmission to Living Cells for Biomedical Application

Research Frontiers in Energy‐Related Materials and Applications for 2020–2030

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