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Nanomaterials
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Recent Progress in TiO2 Nanostructures
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Recent Progress in TiO2 Nanostructures

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Synthesis, Interfaces and Nanostructures".

Deadline for manuscript submissions: closed (30 March 2023) | Viewed by 9427

Special Issue Editor

Prof. Dr. Moisés Pérez-Lorenzo

E-Mail Website
Guest Editor
CINBIO, Department of Physical Chemistry, Universidade de Vigo, 36310 Vigo, Spain
Interests: nanostructures; plasmonics; catalysis; sensing; drug delivery

Special Issue Information

Dear Colleagues, 

Over the last years, the use of TiO2-based nanostructures has constantly evolved and expanded, propelling these materials to a leading position in different areas of nanoscience and nanotechnology. In this regard, these architectures are known to play a pivotal role in the fields of energy conversion, organic synthesis and environmental remediation, although applications in sensing, drug delivery, theranostics, antibacterial devices, and tissue engineering have experienced substantial growth owing to the thriving biomedical sciences. In light of the above, scientific and technological solutions based on the use of engineered TiO2-based nanostructures are expected to keep making a huge impact in society, providing powerful new tools to solve the current challenges faced by the chemical, pharmaceutical and biotechnological industry. In order to support further advances in these research fields, this Special Issue aims to gather recent efforts on the design, synthesis and applications of titanium dioxide nanostructures. Due to their widespread use and, consequently, their increasing exposure potential, studies on the assessment of the toxicity and biocompatibility of these materials are also encouraged.  Original research articles and reviews are welcome. Research areas may include (but not limited to) the following: 

  • Catalysis
  • Photocatalysis
  • Photoelectrocatalysis
  • Photoelectrochemistry
  • Photovoltaics
  • Organic synthesis
  • Environmental remediation
  • Sensing
  • Drug delivery
  • Antibacterial agents
  • Theranostics
  • Tissue engineering
  • Technological devices and systems
  • Nanotoxicology and nanosafety

We look forward to receiving your contributions.

Prof. Dr. Moisés Pérez-Lorenzo
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Nanomaterials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2900 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Catalysis
  • Photocatalysis
  • Photoelectrocatalysis
  • Photoelectrochemistry
  • Photovoltaics
  • Organic synthesis
  • Environmental remediation
  • Sensing
  • Drug delivery
  • Antibacterial agents
  • Theranostics
  • Tissue engineering
  • Technological devices and systems
  • Nanotoxicology and nanosafety

Published Papers (5 papers)

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Research

Jump to: Review

17 pages, 19670 KiB  
Article
Novel Sol-Gel Synthesis of TiO2 Spherical Porous Nanoparticles Assemblies with Photocatalytic Activity
by Carla Calabrese, Amélie Maertens, Alessandra Piras, Carmela Aprile and Leonarda Francesca Liotta
Nanomaterials 2023, 13(13), 1928; https://doi.org/10.3390/nano13131928 - 25 Jun 2023
Viewed by 1527
Abstract
For this study, the synthesis of TiO2 nanomaterials was performed via a novel sol-gel method employing titanium butoxide as a metal precursor, Pluronic F127 as a templating agent, toluene as a swelling agent, and acidic water or ethanol as the reaction solvents. [...] Read more.
For this study, the synthesis of TiO2 nanomaterials was performed via a novel sol-gel method employing titanium butoxide as a metal precursor, Pluronic F127 as a templating agent, toluene as a swelling agent, and acidic water or ethanol as the reaction solvents. The method was designed by tailoring certain reaction parameters, such as the sequence of toluene addition, magnetic stirring, the type of reaction solvent, and the calcination conditions. Analysis of the specific surface area and porosity was carried out via N2 physisorption, whereas the morphological features of the solids were investigated via transmission electron microscopy. The crystalline structure of both the dried powders and the calcined materials was evaluated using X-ray diffraction analysis. It transpired that the different phase compositions of the solids are related to the specific synthesis medium employed. Under the adopted reaction conditions, ethanol, which was used as a reaction solvent, promoted the local arrangement of dispersed anatase particles, the specific arrangement of which does not lead to rutile transformation. Conversely, the use of water alone supported high-particle packing, evolving into a rutile phase. The photodegradation of Rhodamine B was used as a target reaction for testing the photocatalytic activity of the selected samples. Full article
(This article belongs to the Special Issue Recent Progress in TiO2 Nanostructures)
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12 pages, 4071 KiB  
Article
Optical and Structural Analysis of TiO2–SiO2 Nanocomposite Thin Films Fabricated via Pulsed Laser Deposition Technique
by Laid Kadri, Abdelkader Abderrahmane, Georgiana Bulai, Aurelian Carlescu, Corneliu Doroftei, Iuliana Motrescu, Silviu Gurlui, Liviu Leontie and Mohamed Adnane
Nanomaterials 2023, 13(10), 1632; https://doi.org/10.3390/nano13101632 - 13 May 2023
Cited by 4 | Viewed by 1332
Abstract
TiO2–SiO2 nanocomposite thin films have gained the attention of the scientific community due to their unique physical and chemical properties. In this paper, we report on the fabrication and characterization of a TiO2–SiO2 nanocomposite disk-shaped target. The [...] Read more.
TiO2–SiO2 nanocomposite thin films have gained the attention of the scientific community due to their unique physical and chemical properties. In this paper, we report on the fabrication and characterization of a TiO2–SiO2 nanocomposite disk-shaped target. The target was used for the deposition of TiO2–SiO2 nanocomposite thin films on fluorine-doped tin oxide/glass substrates using the pulsed laser deposition (PLD) technique. The thicknesses of the thin films were fixed to 100 nm, and the deposition temperature ranged from room temperature to 300 °C. As revealed by the microstructural and morphological characterizations revealed, the TiO2–SiO2 nanocomposite thin films are amorphous and display homogeneous distribution. The determined values of the indirect optical band gap range from 2.92 to 3.07 eV, while those of the direct optical band gap lie between 3.50 and 3.55 eV. Additionally, as the deposition temperature decreases, the light transmission increases in the visible and in the ultraviolet ranges, which is suitable for flexible perovskite solar cells. This research can uncover new insights into the fabrication of amorphous TiO2–SiO2-based nanostructured thin films using the PLD technique for perovskite solar cell technology. Full article
(This article belongs to the Special Issue Recent Progress in TiO2 Nanostructures)
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13 pages, 4177 KiB  
Article
Photobiomodulation-Based Synergic Effects of Pt-Coated TiO2 Nanotubes and 850 nm Near-Infrared Irradiation on the Osseointegration Enhancement: In Vitro and In Vivo Evaluation
by Kyoung-Suk Moon, Ji-Myung Bae, Young-Bum Park, Eun-Joo Choi and Seung-Han Oh
Nanomaterials 2023, 13(8), 1377; https://doi.org/10.3390/nano13081377 - 15 Apr 2023
Cited by 2 | Viewed by 1241
Abstract
Photobiomodulation (PBM) therapy is known to have the potential to improve bone regeneration after implant surgery. However, the combinatory effect of the nanotextured implant and PBM therapy on osseointegration has not yet been proved. This study evaluated the photobiomodulation-based synergistic effects of Pt-coated [...] Read more.
Photobiomodulation (PBM) therapy is known to have the potential to improve bone regeneration after implant surgery. However, the combinatory effect of the nanotextured implant and PBM therapy on osseointegration has not yet been proved. This study evaluated the photobiomodulation-based synergistic effects of Pt-coated titania nanotubes (Pt-TiO2 NT) and 850 nm near-infrared (NIR) light on osteogenic performance in vitro and in vivo. The FE-SEM and the diffuse UV-Vis-NIR spectrophotometer were used to perform the surface characterization. The live-dead, MTT, ALP, and AR assays were tested to perform in vitro tests. The removal torque testing, the 3D-micro CT, and the histological analysis were used to conduct in vivo tests. The live-dead and MTT assay resulted in Pt-TiO2 NTs being biocompatible. The ALP activity and AR assays demonstrated that the combination of Pt-TiO2 NT and NIR irradiation significantly enhanced osteogenic functionality (p < 0.05). The results of in vivo test, employing the removal torque testing, the 3D-micro CT, and histological analysis, showed overall improved outcomes; however, no significant difference was observed between the control and experimental groups (p > 0.05). Therefore, we confirmed the possibility of the combination of Pt-TiO2 NT and NIR light as a promising technology for implant surgery in dentistry. Full article
(This article belongs to the Special Issue Recent Progress in TiO2 Nanostructures)
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Review

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46 pages, 14130 KiB  
Review
Recent Advancements in TiO2 Nanostructures: Sustainable Synthesis and Gas Sensing
by Gayan W. C. Kumarage, Hadjer Hakkoum and Elisabetta Comini
Nanomaterials 2023, 13(8), 1424; https://doi.org/10.3390/nano13081424 - 20 Apr 2023
Cited by 10 | Viewed by 1877
Abstract
The search for sustainable technology-driven advancements in material synthesis is a new norm, which ensures a low impact on the environment, production cost, and workers’ health. In this context, non-toxic, non-hazardous, and low-cost materials and their synthesis methods are integrated to compete with [...] Read more.
The search for sustainable technology-driven advancements in material synthesis is a new norm, which ensures a low impact on the environment, production cost, and workers’ health. In this context, non-toxic, non-hazardous, and low-cost materials and their synthesis methods are integrated to compete with existing physical and chemical methods. From this perspective, titanium oxide (TiO2) is one of the fascinating materials because of its non-toxicity, biocompatibility, and potential of growing by sustainable methods. Accordingly, TiO2 is extensively used in gas-sensing devices. Yet, many TiO2 nanostructures are still synthesized with a lack of mindfulness of environmental impact and sustainable methods, which results in a serious burden on practical commercialization. This review provides a general outline of the advantages and disadvantages of conventional and sustainable methods of TiO2 preparation. Additionally, a detailed discussion on sustainable growth methods for green synthesis is included. Furthermore, gas-sensing applications and approaches to improve the key functionality of sensors, including response time, recovery time, repeatability, and stability, are discussed in detail in the latter parts of the review. At the end, a concluding discussion is included to provide guidelines for the selection of sustainable synthesis methods and techniques to improve the gas-sensing properties of TiO2. Full article
(This article belongs to the Special Issue Recent Progress in TiO2 Nanostructures)
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38 pages, 11071 KiB  
Review
Unraveling Structure–Performance Relationships in Porphyrin-Sensitized TiO2 Photocatalysts
by Belén Vaz and Moisés Pérez-Lorenzo
Nanomaterials 2023, 13(6), 1097; https://doi.org/10.3390/nano13061097 - 18 Mar 2023
Cited by 10 | Viewed by 2690
Abstract
Over the years, porphyrins have arisen as exceptional photosensitizers given their ability to act as chlorophyll-mimicking dyes, thus, transferring energy from the light-collecting areas to the reaction centers, as it happens in natural photosynthesis. For this reason, porphyrin-sensitized TiO2-based nanocomposites have [...] Read more.
Over the years, porphyrins have arisen as exceptional photosensitizers given their ability to act as chlorophyll-mimicking dyes, thus, transferring energy from the light-collecting areas to the reaction centers, as it happens in natural photosynthesis. For this reason, porphyrin-sensitized TiO2-based nanocomposites have been widely exploited in the field of photovoltaics and photocatalysis in order to overcome the well-known limitations of these semiconductors. However, even though both areas of application share some common working principles, the development of solar cells has led the way in what is referred to the continuous improvement of these architectures, particularly regarding the molecular design of these photosynthetic pigments. Yet, those innovations have not been efficiently translated to the field of dye-sensitized photocatalysis. This review aims at filling this gap by performing an in-depth exploration of the most recent advances in the understanding of the role played by the different structural motifs of porphyrins as sensitizers in light-driven TiO2-mediated catalysis. With this goal in mind, the chemical transformations, as well as the reaction conditions under which these dyes must operate, are taken in consideration. The conclusions drawn from this comprehensive analysis offer valuable hints for the implementation of novel porphyrin–TiO2 composites, which may pave the way toward the fabrication of more efficient photocatalysts. Full article
(This article belongs to the Special Issue Recent Progress in TiO2 Nanostructures)
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