Gotowe bibliografie tematyczne / Photocatalytic Properties - Nanostructures

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Gotowa bibliografia na temat „Photocatalytic Properties - Nanostructures”

Autor: Grafiati

Data publikacji: 7 września 2023

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Artykuły w czasopismach na temat "Photocatalytic Properties - Nanostructures"

Cao, Feng, Jianmin Wang, Wanhong Tu, Xin Lv, Song Li i Gaowu Qin. "Uniform Bi2O2CO3 hierarchical nanoflowers: solvothermal synthesis and photocatalytic properties". Functional Materials Letters 08, nr 02 (kwiecień 2015): 1550021. http://dx.doi.org/10.1142/s1793604715500216.

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Well-defined flowerlike Bi 2 O 2 CO 3 nanostructures were fabricated by a simple one-pot solvothermal method with high yield. The products were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy, transmission electron microscopy, nitrogen sorption, photoluminescence spectra and UV–visible diffuse reflectance spectroscopy. The photocatalytic properties of the as-prepared samples were further investigated by photocatalytic decomposition of Rhodamine B (RhB) dye, and it was found that the Bi 2 O 2 CO 3 nanoflowers showed a good photocatalytic activity under UV light. The excellent photocatalytic performance of Bi 2 O 2 CO 3 flowerlike nanostructures is related to its special nanostructure and morphology, indicates its potential application in photocatalysis and nanosensors.

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Guo, Xiaoxiao, Xiaoyun Qin, Zhenjie Xue, Changbo Zhang, Xiaohua Sun, Jibo Hou i Tie Wang. "Morphology-controlled synthesis of WO2.72 nanostructures and their photocatalytic properties". RSC Advances 6, nr 54 (2016): 48537–42. http://dx.doi.org/10.1039/c6ra08551b.

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WO_2.72 nanowires and urchin-like WO_2.72 nanostructures exhibited enhanced photocatalytic activities for organic pollutants degradation compared to commercial nanostructured tungsten oxide.

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Prabhakar Vattikuti, Surya V., Jie Zeng, Rajavaram Ramaraghavulu, Jaesool Shim, Alain Mauger i Christian M. Julien. "High-Throughput Strategies for the Design, Discovery, and Analysis of Bismuth-Based Photocatalysts". International Journal of Molecular Sciences 24, nr 1 (30.12.2022): 663. http://dx.doi.org/10.3390/ijms24010663.

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Bismuth-based nanostructures (BBNs) have attracted extensive research attention due to their tremendous development in the fields of photocatalysis and electro-catalysis. BBNs are considered potential photocatalysts because of their easily tuned electronic properties by changing their chemical composition, surface morphology, crystal structure, and band energies. However, their photocatalytic performance is not satisfactory yet, which limits their use in practical applications. To date, the charge carrier behavior of surface-engineered bismuth-based nanostructured photocatalysts has been under study to harness abundant solar energy for pollutant degradation and water splitting. Therefore, in this review, photocatalytic concepts and surface engineering for improving charge transport and the separation of available photocatalysts are first introduced. Afterward, the different strategies mainly implemented for the improvement of the photocatalytic activity are considered, including different synthetic approaches, the engineering of nanostructures, the influence of phase structure, and the active species produced from heterojunctions. Photocatalytic enhancement via the surface plasmon resonance effect is also examined and the photocatalytic performance of the bismuth-based photocatalytic mechanism is elucidated and discussed in detail, considering the different semiconductor junctions. Based on recent reports, current challenges and future directions for designing and developing bismuth-based nanostructured photocatalysts for enhanced photoactivity and stability are summarized.

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Wang, S. L., H. W. Zhu, W. H. Tang i P. G. Li. "Propeller-Shaped ZnO Nanostructures Obtained by Chemical Vapor Deposition: Photoluminescence and Photocatalytic Properties". Journal of Nanomaterials 2012 (2012): 1–5. http://dx.doi.org/10.1155/2012/594290.

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Propeller-shaped and flower-shaped ZnO nanostructures on Si substrates were prepared by a one-step chemical vapor deposition technique. The propeller-shaped ZnO nanostructure consists of a set of axial nanorod (50 nm in tip, 80 nm in root and 1 μm in length), surrounded by radial-oriented nanoribbons (20–30 nm in thickness and 1.5 μm in length). The morphology of flower-shaped ZnO nanostructure is similar to that of propeller-shaped ZnO, except the shape of leaves. These nanorods leaves (30 nm in diameter and 1–1.5 μm in length) are aligned in a radial way and pointed toward a common center. The flower-shaped ZnO nanostructures show sharper and stronger UV emission at 378 nm than the propeller-shaped ZnO, indicating a better crystal quality and fewer structural defects in flower-shaped ZnO. In comparison with flower-shaped ZnO nanostructures, the propeller-shaped ZnO nanostructures exhibited a higher photocatalytic property for the photocatalytic degradation of Rhodamine B under UV-light illumination.

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Stride, John A., i Nam T. Tuong. "Controlled Synthesis of Titanium Dioxide Nanostructures". Solid State Phenomena 162 (czerwiec 2010): 261–94. http://dx.doi.org/10.4028/www.scientific.net/ssp.162.261.

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Recent interest in nanostructured titanium dioxide (TiO2) has been driven by the excellent photocatalytic and optical properties exhibited by the anatase and rutile phases. This article highlights the relationship between reaction conditions and the resultant nanostructured TiO2 and is primarily focused on wet chemical synthetic methods. We show that solvothermal syntheses of nano-TiO2 can be rationalised by making use of a diffusion-controlled model accounting for physical properties of the solvent such as the vapour-pressure, allowing the prediction and control the phase, size and type of nanostructured TiO2 product. This external control makes it possible for the systematic synthesis of TiO2 nanostructures via parameters such as the solvent chain length, the reaction temperature and time, and also by the addition of surfactants, providing the ability to design and tailor the nanostructured TiO2, which is vital for the optimal application of these nanostructures in photocatalytic or optical applications.

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Mutuma, Bridget K., Xiluva Mathebula, Isaac Nongwe, Bonakele P. Mtolo, Boitumelo J. Matsoso, Rudolph Erasmus, Zikhona Tetana i Neil J. Coville. "Unravelling the interfacial interaction in mesoporous SiO2@nickel phyllosilicate/TiO2 core–shell nanostructures for photocatalytic activity". Beilstein Journal of Nanotechnology 11 (9.12.2020): 1834–46. http://dx.doi.org/10.3762/bjnano.11.165.

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Core–shell based nanostructures are attractive candidates for photocatalysis owing to their tunable physicochemical properties, their interfacial contact effects, and their efficacy in charge-carrier separation. This study reports, for the first time, on the synthesis of mesoporous silica@nickel phyllosilicate/titania (mSiO2@NiPS/TiO2) core–shell nanostructures. The TEM results showed that the mSiO2@NiPS composite has a core–shell nanostructure with a unique flake-like shell morphology. XPS analysis revealed the successful formation of 1:1 nickel phyllosilicate on the SiO2 surface. The addition of TiO2 to the mSiO2@NiPS yielded the mSiO2@NiPS/TiO2 composite. The bandgap energy of mSiO2@NiPS and of mSiO2@NiPS/TiO2 were estimated to be 2.05 and 2.68 eV, respectively, indicating the role of titania in tuning the optoelectronic properties of the SiO2@nickel phyllosilicate. As a proof of concept, the core–shell nanostructures were used as photocatalysts for the degradation of methyl violet dye and the degradation efficiencies were found to be 72% and 99% for the mSiO2@NiPS and the mSiO2@NiPS/TiO2 nanostructures, respectively. Furthermore, a recyclability test revealed good stability and recyclability of the mSiO2@NiPS/TiO2 photocatalyst with a degradation efficacy of 93% after three cycles. The porous flake-like morphology of the nickel phyllosilicate acted as a suitable support for the TiO2 nanoparticles. Further, a coating of TiO2 on the mSiO2@NiPS surface greatly affected the surface features and optoelectronic properties of the core–shell nanostructure and yielded superior photocatalytic properties.

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AK AZEM, Funda, Işıl BİRLİK, Özgür Yasin KESKİN i Tülay KOÇ DELİCE. "Improvement of Photocatalytic Degradation of Titanium Dioxide Nanomaterials by Non-metal Doping". Afyon Kocatepe University Journal of Sciences and Engineering 23, nr 4 (29.08.2023): 874–82. http://dx.doi.org/10.35414/akufemubid.1256778.

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Semiconductor photocatalysis is a process that benefits from sunlight to start chemical reactions. In order to take advantage photocatalytic properties of semiconductors and to achieve better performance structural adjustment is needed. In this study, varying amounts of nitrogen were used to modify TiO2 nanostructures using the sol-gel method. The crystalline structure of the synthesized TiO2 nanostructures was studied using the X-ray diffraction (XRD) technique. X-ray photoelectron spectroscopy (XPS) was conducted to analyse the elemental composition of nanomaterials. XPS analyze confirms that nitrogen is introduced into the lattice of TiO2. The photocatalytic degradation of methylene blue (MB) under UV irradiation was employed to assess the photocatalytic performance of the samples. To evaluate degradation, the absorption of MB over time was measured using a UV-Vis spectrophotometer. As a result, the doping process has been found to improve the photocatalytic performance of TiO2, and 0.2% N doped TiO2 nanostructures demonstrated superior photocatalytic activity for photocatalytic degradation of MB.

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Karpyna, V. A., L. A. Myroniuk, D. V. Myroniuk, M. E. Bugaiova, L. I. Petrosian, O. I. Bykov, O. I. Olifan i in. "Photocatalysis and optical properties of ZnO nanostructures grown by MOCVD on Si, Au/Si and Ag/Si wafers". Himia, Fizika ta Tehnologia Poverhni 14, nr 1 (30.03.2023): 83–92. http://dx.doi.org/10.15407/hftp14.01.083.

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Zinc oxide nanostructures (NS) were grown on thin discontinuous films of noble metals of silver and gold in order to study their structure, optical properties as well as photocatalytic and antiviral activity. The paper presents the results of X-ray diffraction study, scanning electron microscopy study, photoluminescence and Raman measurements. X-ray diffraction experiments demonstrate similar patterns for all grown ZnO nanostructures. The SEM images of ZnO NS grown on Ag/Si and Au/Si wafers demonstrate more dense surface microstructure compared to ZnO NS grown on bare Si wafers. The most intensive ultraviolet and deep level emissions are observed for ZnO NS grown on Ag/Si wafers. Increase in thicknesses of Ag island film from 5 nm to 10 nm gives significant increase in intensity of ultraviolet and deep level emissions. Photocatalysis of grown ZnO nanostructures was studied by methyl orange dye degradation. Superior photocatalytic results are demonstrated by ZnO nanostructures grown on Ag/Si wafers, for which constants of dye degradation were twice higher than for ZnO nanostructures grown on Si and Au/Si substrates. The photocatalytic results correlates with photoluminescence spectra: more intensive photoluminescence in ultraviolet and visible ranges of optical spectrum leads to better photocatalytic performance. The cytotoxic effect of ZnO nanostructures was studied without photoactivation by the help of cell cultures MDCK and Hep-2 while the virucidal effect of ZnO nanostructures was studied by the help of Influenza A virus (H1N1) (strain FM / 1/47) and human adenovirus serotype 2 (HAdV2). ZnO nanostructures in a 1:10 dilution were not toxic to Hep-2 and MDCK cells. Most of the tested ZnO nanostructures exhibited no virucidal activity against human adenovirus serotype 2 (HAdV2) and influenza A virus (H1N1) (strain FM / 1/47) in the absence of photoexcitation.

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Verma, Hemant Kumar, Mahak Vij i K. K. Maurya. "Synthesis, Characterization and Sun Light-Driven Photocatalytic Activity of Zinc Oxide Nanostructures". Journal of Nanoscience and Nanotechnology 20, nr 6 (1.06.2020): 3683–92. http://dx.doi.org/10.1166/jnn.2020.17679.

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Low-temperature growth of nanostructures with large yield is a basic requirement for fulfilling the demand of large-scale applications of nanomaterials. The synthesis of nanoscale materials has gained considerable attention due to their excellent properties also in photocatalysis. Catalyst and Dopant free, solar active ZnO nanostructures photocatalysts with vacancy richness were synthesized in large quantities (in grams) through the co-precipitation growth process using ZnNi2·6H2O as the zinc source at room temperature. This method has advantages such as low temperature with high yield (>8 grams per liter) at atmospheric pressure synthesis. The experimental results confirm that synthesized ZnO samples were crystallized into a wurtzite hexagonal structure. Under direct sunlight energy examined degradation of organic dye methylene blue (MB) for photocatalytic activity using ZnO nanostructures. The photocatalytic performance depends on the different defects as well as the specific surface area. After photocatalytic degradation of MB dye in 60 min under natural sunlight irradiation colorless matrix was observed. The repeatability assessments for reusability of ZnO nanostructures after photocatalytic activity was also studied and reported for degradation of organic MB dye.

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Rajbongshi, Himanshu, i Dipjyoti Kalita. "Morphology-Dependent Photocatalytic Degradation of Organic Pollutant and Antibacterial Activity with CdS Nanostructures". Journal of Nanoscience and Nanotechnology 20, nr 9 (1.09.2020): 5885–95. http://dx.doi.org/10.1166/jnn.2020.18552.

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Efficient removal of organic pollutants from waste water by nanostructured photocatalysts has become an emerging research due to its importance in environmental remediation. Herein, CdS nanostructures with different morphologies i.e., spherical, nanopetal and rose-like have been synthesized by wet chemical method using TEA as a structure directing agent. The morphology, crystal structure, composition, surface area and optical properties of the nanostructures are investigated by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Energy dispersive X-ray spectroscopy (EDX), Brunauer-Emment-Teller (BET) analyser, Ultraviolet-Visible (UV-Vis) absorption spectroscopy and Photoluminescence (PL) spectroscopy. XRD patterns indicate the existence of hexagonal phase of CdS in all the three morphologies. The SEM images confirm the morphological transformation of spherical CdS nanoparticles (NPs) to nanopetal and rose-like morphology with the increase in concentration of TEA in the synthesis process. UV-visible absorption spectra show that rose-like CdS nanostructure exhibits red-shift of absorption wavelength compared to spherical and nanopetal CdS nanostructures. The increase in intensity of PL peak of rose-like CdS at 576.6 nm compared to that of spherical and nanopetal CdS, confirms the presence of more S vacancies or defect states. The BET specific surface areas of spherical, nanopetal and rose-like CdS nanostructures are determined to be 4.18, 6.64 and 8.93 m2/g, respectively. The EIS Nyquist plot confirms the higher electron transfer efficiency of rose-like CdS than that of spherical and nanopetal CdS. The photocatalytic activity of these three nanostructures are evaluated for the degradation of methylene blue (MB) dye in water solution under sunlight irradiation. Among the three structures, rose-like CdS nanostructure shows highest photocatalytic efficiency (96.5%) under sunlight irradiation within 120 min of sunlight irradiation. Antibacterial activity of the synthesized CdS nanostructures is performed against two Gram-positive and Gram-negative bacteria and rose-like CdS shows more activity against both types of bacteria than that of spherical and nanopetal CdS.

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Rozprawy doktorskie na temat "Photocatalytic Properties - Nanostructures"

Zinatloo-Ajabshir, S., i M. Salavati-Niasari. "Facile Solvent-Less Preparation, Characterization and Investigation of Photocatalytic Properties of Pr6O11 Nanostructures". Thesis, Sumy State University, 2015. http://essuir.sumdu.edu.ua/handle/123456789/42498.

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Pr6O11 nanostructures were synthesized through a facile solvent-less method. Nanostructures were prepared by heat treatment in air, using [Pr L(NO3)2]NO3 (L  bis-(salicyladehyde)-1,4-butadiimine Schiff base ligand), as new precursor, which was obtained by a solvent-free solid–solid reaction from praseodymium nitrate and Schiff base ligand. The as-obtained nanostructures were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and ultraviolet–visible (UV–vis)spectroscopy. The obtained results demonstrated that utilizing of this precursor is suitable choice for preparation of Pr6O11 nanostructures with very uniform sphere-like morphology. The photocatalyst activity of as-obtained Pr6O11 was also examined by degradation of 2-naphthol as organic contaminant under ultraviolet light irradiation.

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Kirsanova, Maria. "ZnSe/CdS Core/Shell Nanostructures and Their Catalytic Properties". Bowling Green State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1342565590.

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Chen, Chun-Hsien, i 陳俊賢. "The Structural, Photocatalytic and Photoelectric Properties of Oxide-Based Heterojunction Nanostructures". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/55592582805076786438.

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博士
國立臺灣大學
材料科學與工程學研究所
102
In order to improve the efficiency of water splitting in photocatalysis, a series of photoelectrodes based on TiO2 nanostructures were proposed in this study. The optical and photoelectric properties of these photocatalysts influenced by ionic defects and semiconductor-composite heterojunctions were investigated. The dopant-free oxygen-deficient TiO2 nanotube arrays were prepared by electrochemical anodization in the aqueous and organic electrolytes, respectively yielding TiO2(aq) and TiO2(EG) nanotube arrays, followed by long-time annealing at four temperatures – 450, 550, 650, and 750 °C. The evolution of architectures (i.e., anatase nanotubes and rutile film) in TiO2 nanotube arrays is confirmed by XRD patterns and SEM micrographs. The depth profiles of these annealed TiO2 samples are obtained from XPS analysis, and the elemental-concentration stable zones within the TiO2 nanostructures show the approximate O/Ti atomic ratios, revealing the extent of oxygen deficiency. The TiO2(aq) samples annealed at high temperatures (i.e., 650 and 750 °C) have O/Ti atomic ratios significantly less than 2 compared to the low-temperature-annealed TiO2(aq) samples, and the TiO2(EG) samples annealed at these four temperatures show extreme O/Ti atomic ratios around 1.5, revealing that the oxygen vacancy concentration in TiO2 nanotube arrays is governed by the annealing temperature and the experimental conditions in the anodization procedure. The optical absorption spectra demonstrate quite different behavior between these two kinds of TiO2 nanotube arrays: a blue shift in absorption edge along with a notable increase in the long-wavelength absorption due to the presence of oxygen vacancies is observed in TiO2(aq) samples; on the other hand, a red shift in absorption edge and an increase in absorbance within the wavelength region of 400-600 nm both result from the carbon doping effect, and are examined in TiO2(EG) samples. For the photocurrent density measurement under controlled light irradiation, the low-temperature-annealed TiO2 samples exhibit large photocurrent responses under light sources containing UV because the high specific surface area provides a large number of active sites for chemical reactions. A strong photocurrent response is found for high-temperature-annealed TiO2 samples under filtered white light (visible light range, λ > 500 nm), which is attributed to the presence of a high concentration of oxygen vacancies. Nanostructured composites composed of TiO2 nanotube arrays and SrTiO3 or CeO2 nanoparticles were fabricated, forming an array of TiO2(EG) nanotubes coated with SrTiO3 or CeO2 nanoparticles. The UV-Vis and UPS spectra were adopted to identify the band structures of the TiO2-SrTiO3 and TiO2-CeO2 heterojunctions. The oxygen vacancy concentration, which can be modified by adjusted the experimental parameters, in composites strongly influenced the band structure of the heterojunction and the photoelectric properties of the composite samples. Compared to the TiO2(EG) nanotube arrays, the photocurrent densities and the capability of photocatalytic water splitting for these composite samples under irradiation are enhanced because the semiconductor heterojunctions in the composites promote the separation of the photo-induced e-/h+ pairs.

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Lai, Chia-I., i 賴佳儀. "The capacitive and photocatalytic properties of composite nanostructures based on titania". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/42223547663260764833.

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碩士
國立臺灣大學
材料科學與工程學研究所
104
Titania nanotube arrays (TNTs) is playing an important role in the field of composite capacitor and improvement of the efficiency of water splitting because of its high chemical stability and high aspect ratio. In this study, we try to develop the unique composite capacitor with special nanostructure from the TNTs. On the other side, The TNTs from one-step or two-step anodization was going through annealing treatment with different temperature. The optical and photoelectric properties to visible light of these photocatalysts would be improved when maintaining complete nanotube arrays structure. To produce composite capacitor, we synthesize TNTs with high aspect ratio from anodization treatment. The structure and chemical composition can be tuned by the combination of wet-etching process and hydrothermal treatment. Filling the nanotube arrays with HfO2 by ALD to produce the composite structure of TiO2 and high-K materials. From the results of several analysis, we found that the shorter nanotube arrays can scale down only with little decreased capacitance. The contact area of high-K material and nanotube arrays structure is the important index of the capacitor performance. And among the polarization mechanisms we proposed, space charge polarization from the width variation of the depletion layer is the most important.one. The other topic of this study is to investigate the photocatalytic ability of the annealed anodized TNTs. Higher annealing temperature can induce higher concentration of oxygen vacancies, extent of nitrogen doping and the ratio of rutile phase, and these are known as band gap narrowing factors. However, higher annealing temperature will make TNTs sintered to become rutile film layer and collapsed, which decreasing irradiated area. In conclusion, one-step anodized TNTs combining the low temperature annealing can perform well under UV light. The better photocatalytic performance can be achieved by the combination of two-step anodized TNTs and higher annealing temperature.

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Yu, Yuan-yuan, i 游沅沅. "Surface modified TiO2 nanostructures with enhanced bio-sensitivity and photocatalytic properties". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/62999830254530740437.

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碩士
國立中央大學
材料科學與工程研究所
102
Titanium oxide (TiO2) has been widely applied in photocatalysts, sensors, solar cells, biomaterials, self-cleaning and so on. The surface morphology and surface chemical modification play important role in the properties of TiO2. This study employed a supercritical-CO2-fluid (ScCO2) cleaning process to modify the chemical properties of anodic TiO2 nanotubes surface. We found that ScCO2-treated TiO2 nanotubes can effectively change their surface wettability as a result of photo-oxidation of C-H functional groups formed on the TiO2 surface. In addition, the crystal structure of TiO2 nanotubes transformed from amorphous phase to anatase after annealing at 450 °C for 2 hours. The C-H functional groups of annealed TiO2 nanotubes were significantly less than amorphous TiO2 nanotubes after the ScCO2 cleaning process. We demonstrated a switchable superhydrophilicity of ScCO2-treated anodic TiO2 nanotubes with UV-light irradiation. In the following, TiO2 nanofibers with different size and crystal structures have been synthesized by electrospinning and further decorated with silver nanoparticles through antibody-mediated synthesis. The study indicates that Ag nanoparticles are uniform deposited on TiO2 nanofibers. Ag-TiO2 nanofibers possessed superb photocatalytic activity for the degradation of Rhodamine B ( RhB ) dye. This study also demonstrates that TiO2 nanofibers possess intrinsic peroxidase-like activity in suitable condition. Ag-TiO2 nanofibers show excellent catalytic performances and good biocompatibility so that they can be used a colorimetric biosensor for glucose detection.

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Das, Debashree. "Oxide nanostructures based on Ti, Nb and Ta for photocatalytic properties". Thesis, 2013. http://localhost:8080/iit/handle/2074/6755.

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Chu, Che-Wu, i 朱哲武. "Synthesis of TiO2 one-dimensional nanostructures by Hydrothermal process and their photocatalytic properties". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/74977349517134874095.

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碩士
中興大學
材料科學與工程學系所
98
The anatase titanium dioxide nanowires on the titanium foil are prepared from hydrothermal treatment on commercial Ti foil in 1M NaOH or KOH followed by HCl washing and post-annealing processes. During the hydrothermal process, Ti foil surface will be etched by alkaline solution so that the roughness of Ti foil doesn’t play an important role to help TiO2 nanowires growth. In addition, 0.1M KOH additive in NaOH solution can better the alignment of TiO2 nanowires. All the formation process of sodium titania nanotubes will be in hydrothermal process. Namely, it will form nanosheets first and turn into roll-up nanosheets (nanotubes). Then, sodium titania nanotubes become hydrogen titania nanotubes during HCl washing. Finally, hydrogen titania nanotubes will transform into TiO2 nanowires. Post annealing process can better its crystallinity. In the end, with the Methylene Blue (MB) degradation by UV, anatase TiO2 nanowires on photocatalytic efficiency is superior than anatase TiO2 film.

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Cheng, Lang-Wei, i 鄭朗尉. "Characterization and photocatalytic properties of bismuth phosphate nanostructures under sonochemical and hydrothermal synthesis". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/60237351552985532062.

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碩士
國立彰化師範大學
化學系
102
The synthesis of bismuth phosphate (BiPO4) nanostructures with various morphologies and phases was explored under ultrasound irradiation and hydrothermal process. Powder X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and UV–Vis diffuse reflectance spectroscopy (DRS) were used to characterize the BiPO4 samples. The effects of ultrasound irradiation and hydrothermal conditions on the phases and morphologies of the BiPO4 samples were studied, and the growth mechanisms of the 1D structure were investigated. The different BiPO4 samples exhibited different optical properties and photocatalytic activities for the degradation of methyl blue (MB) under UV light irradiation. The experimental results suggest that the high photocatalytic activity of the sample prepared under hydrothermal conditions is due to a low electron and hole recombination rate and the high potential of the photogenerated holes in the valence band. The practicality of this BiPO4 photocatalyst was validated for the degradation of MB in environmental and industrial wastewater samples, which demonstrated the advantages of its high photocatalytic activity.

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Jiang, Jian-Ru, i 江建儒. "Study on Surface Enhanced Raman Scattering and Photocatalytic Properties of Ag-decorated Cu2S Composite Nanostructures". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/29666594571430551225.

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碩士
國立中央大學
材料科學與工程研究所
101
The surface characteristics of nanostructures play a critical role in the applications. In this thesis, two Cu2S nanostructures synthesized via a general solution route are applied in surface enhanced Raman scattering (SERS) and photocatalytic degradation. In the first part of this thesis, we demonstrate a facile, rapid, and practical approach to fabricate a flowerlike Cu2S substrate and then decorated Ag nanoparticles with a convenient galvanic reduction method. The scanning electron microscopy (SEM) images indicate that Ag nanoparticles are preferential deposited on the edge of Cu2S sheets due to the localization of the electrons on the surface of Cu2S. Owing to the introduction of Ag nanoparticles on the surface of Cu2S structures, the resulting Ag-Cu2S composite structures could be used as a versatile substrate for surface enhanced Raman scattering. In addition, Ag nanoparticles on the semiconductor surface behave like electron sinks, which can provide sites for accumulation of the photogenerated electrons, and then facilitate the separation of electrons and holes. Hence, adding Ag nanoparticles is a promising method to enhance the photocatalytic performance of Cu2S nanosheets. It is significant that photocatalysts fabricated by Cu2S nanosheets can be applied to the degradation of organic pollution, and solves the environmental issues. In the second part, the Cu2S nanowires grow directly onto copper substrate by utilizing the biomolecule-assisted approach. Besides the reductive properties of biomolecules, they also have strong shape or size directing functionality in the reaction process. The field-emission properties of the Cu2S nanowires are studied by the Folwer-Nordheim (F-N) theory. The Cu2S nanowires show low turn-on field (1.19 V/μm) and high field enhancement factor (β=19381). The photocatalytic activity of two kinds of Cu2S structures was investigated by degradation of rhodamine B (RhB) under UV illumination. The experimental results indicate that surface area play a significant role on the efficiency of photocatalysis since photocatalytic reaction occurred on the surface.

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Chen, Yi-Ru, i 陳怡如. "Study on Ultraviolet Photoresponsive and Photocatalytic Properties of ZnO Nanostructures Synthesized via Atmospheric Thermal Decomposition Process". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/13876752607193232200.

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碩士
逢甲大學
材料科學所
98
ZnO (Zinc oxide, ZnO) nanostructures have been synthesized using ultraviolet and thermal decomposition process in ambient air, which is simple process, low cost, and short process time (only require ten minutes). As-synthesized ZnO nanostructures have been addressed to characterize the photoresponsive and photocatalytic properties. All as-synthesized products were characterized using field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffractometer (XRD), and X-ray photoelectron spectroscopy (XPS). In addition, a UV detection system was used to investigate the sensing activities of as-synthesized ZnO nanostructures while the ultraviolet-visible spectrophotometry (UV/vis, Hitachi U-3900 double-beam spectrophotometry) was performed to determine the photocatalytic activities of the as-synthesized products. Zinc acetylacetonate hydrate【Zn(AcAc)2】 was acted as solute while isopropyl alcohol (IPA), denatured alcohol, ethanol and acetone were used for solvent to prepared the Zn(AcAc)2 precursors. The UV-light (~365nm, 76mW/cm2) was used as light-source while the electronic furnace system was used as thermal-source to decompose the Zn(AcAc)2 precursors with process temperature ~ 200oC to synthesize the ZnO nanostructures. This work revealed that as-synthesized ZnO nanostructures (with IPA solvent) exhibited an ultra-high sensitivity ~809 folds as irradiated the sample to UV-light (~365 nm, 2.33 mW/cm2). Photoluminescence (PL) spectra demonstrated that the photoresponsive properties were proportional to the intensity of ZnO emission band (~380nm). In addition, the high surfaces to volume ratio of ZnO nanowires can be successful synthesized by UV decomposition and thermal decomposition process with process time ~ 10 minutes. The precursor is Zn(AcAc)2 with the solvent of denatured ethanol while through thermal decomposition for 3 minutes. To investigate the photocatalytic properties, as-synthesized ZnO nanowires with methylene blue (MB, C16H18ClN3S•H2O, 10μM) solution were irradiated under UV-light (254 nm, 3.15 mW/cm2) for 20 minutes. The highest dye decolorization efficiency (90% in 20 minutes ) was observed. The photocatalytic property of as-synthesized ZnO naowires is superior to that of commercial P25 TiO2 nanparticels. This work is developing a simple process, short process time, large scale, and cost of facilities-based investment. These unique advantages demonstrate that as-synthesized ZnO nanostructures probably possess the highly potential applications in novel optoelectronic devices.

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Książki na temat "Photocatalytic Properties - Nanostructures"

International Symposium on Explosion, Shock Wave and Hypervelocity Phenomena (2nd 2007 Kumamoto, Japan). Explosion, shock wave and hypervelocity phenomena in materials II: Selected peer reviewed papers from the 2nd International Symposium on Explosion, Shock Wave and Hypervelocity Phenomena (ESHP-2), 6-9 March 2007, Kumamoto, Japan. Stafa-Zurich, Switzerland: Trans Tech Publications, 2008.

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Yousefi, Ramin. Optical Properties of Semiconducting Nanostructures for Photocatalytic Applications: Fundamental Understanding and Material Design. Elsevier Science & Technology, 2021.

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Netzer, Falko P., i Claudine Noguera. Oxide Thin Films and Nanostructures. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198834618.001.0001.

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Nanostructured oxide materials ultra-thin films, nanoparticles and other nanometer-scale objects play prominent roles in many aspects of our every-day life, in nature and in technological applications, among which is the all-oxide electronics of tomorrow. Due to their reduced dimensions and dimensionality, they strongly interact with their environment gaseous atmosphere, water or support. Their novel physical and chemical properties are the subject of this book from both a fundamental and an applied perspective. It reviews and illustrates the various methodologies for their growth, fabrication, experimental and theoretical characterization. The role of key parameters such as film thickness, nanoparticle size and support interactions in driving their fundamental properties is underlined. At the ultimate thickness limit, two-dimensional oxide materials are generated, whose functionalities and potential applications are described. The emerging field of cation mixing is mentioned, which opens new avenues for engineering many oxide properties, as witnessed by natural oxide nanomaterials such as clay minerals, which, beyond their role at the Earth surface, are now widely used in a whole range of human activities. Oxide nanomaterials are involved in many interdisciplinary fields of advanced nanotechnologies: catalysis, photocatalysis, solar energy materials, fuel cells, corrosion protection, and biotechnological applications are amongst the areas where they are making an impact; prototypical examples are outlined. A cautious glimpse into future developments of scientific activity is finally ventured to round off the treatise.

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Rai, Dibya Prakash, red. Advanced Materials and Nano Systems: Theory and Experiment - Part 2. BENTHAM SCIENCE PUBLISHERS, 2022. http://dx.doi.org/10.2174/97898150499611220201.

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The discovery of new materials and the manipulation of their exotic properties for device fabrication is crucial for advancing technology. Nanoscience, and the creation of nanomaterials have taken materials science and electronics to new heights for the benefit of mankind. Advanced Materials and Nanosystems: Theory and Experiment covers several topics of nanoscience research. The compiled chapters aim to update students, teachers, and scientists by highlighting modern developments in materials science theory and experiments. The significant role of new materials in future technology is also demonstrated. The book serves as a reference for curriculum development in technical institutions and research programs in the field of physics, chemistry and applied areas of science like materials science, chemical engineering and electronics. This part covers 12 topics in these areas: 1. Recent advancements in nanotechnology: a human health Perspective 2. An exploratory study on characteristics of SWIRL of AlGaAs/GaAs in advanced bio based nanotechnological systems 3. Electronic structure of the half-Heusler ScAuSn, LuAuSn and their superlattice 4. Recent trends in nanosystems 5. Improvement of performance of single and multicrystalline silicon solar cell using low-temperature surface passivation layer and antireflection coating 6. Advanced materials and nanosystems 7. Effect of nanostructure-materials on optical properties of some rare earth ions doped in silica matrix 8. Nd2Fe14B and SmCO5: a permanent magnet for magnetic data storage and data transfer technology 9. Visible light induced photocatalytic activity of MWCNTS decorated sulfide based nano photocatalysts 10. Organic solar cells 11. Neodymium doped lithium borosilicate glasses 12. Comprehensive quantum mechanical study of structural features, reactivity, molecular properties and wave function-based characteristics of capmatinib

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Części książek na temat "Photocatalytic Properties - Nanostructures"

Bharathi, S., D. Nataraj, K. Senthil i Yoshitake Masuda. "Shape-controlled synthesis of α-Fe2O3 nanostructures: engineering their surface properties for improved photocatalytic degradation efficiency". W Nanotechnology for Sustainable Development, 113–25. Cham: Springer International Publishing, 2012. http://dx.doi.org/10.1007/978-3-319-05041-6_9.

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Mbulanga, Crispin Munyelele, Chinedu Christian Ahia i Johannes Reinhardt Botha. "Properties of Titanium Dioxide-Based Nanostructures on Transparent Glass Substrates for Water Splitting and Photocatalytic Application". W Chemically Deposited Nanocrystalline Metal Oxide Thin Films, 389–403. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-68462-4_15.

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Pyrgiotakis, Georgios. "Carbon Nanostructures for Enhanced Photocatalysis for Biocidal Applications". W Handbook of Nanomaterials Properties, 771–91. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-31107-9_9.

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Kamegawa, Takashi, i Hiromi Yamashita. "Photocatalytic Properties of TiO2-Loaded Porous Silica with Hierarchical Macroporous and Mesoporous Architectures". W Nanostructured Photocatalysts, 229–40. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-26079-2_13.

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Maheshwari, Seema, Shikha Bhogal, Kuldeep Kaur i Ashok Kumar Malik. "Photocatalytic and Sensing Applications of Semiconductor Nanostructures". W Synthesis and Applications of Semiconductor Nanostructures, 29–57. BENTHAM SCIENCE PUBLISHERS, 2023. http://dx.doi.org/10.2174/9789815080117123040007.

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Semiconductor Nanostructures (SCNSs) are of great interest due to their excellent optical and electronic properties. As a result of their unique properties, semiconductor nanostructures have found applications in several fields, including optoelectronics, solar energy conversion, photocatalysis, and sensing. SCNSs show promising prospects in photocatalytic and sensing applications. Photocatalytic application of SCNSs provides potential solutions for environmental remediation and energy generation. Several strategies have been developed to achieve high efficiency for photocatalytic processes using semiconductor nanostructures. Efforts have also been made to achieve high sensitivities in sensing applications using SCNSs. In the present chapter, the photocatalysis activity of semiconductor nanostructures has been discussed along with the photocatalytic mechanism and strategies for enhancing photocatalytic efficiency. Several applications of semiconductor photocatalysis in wastewater treatment, hydrogen production, and air purification are cited in recent literature. The sensing applications of semiconductor nanostructures have also been discussed, including their use as chemical sensors, gas sensors, and biosensors.

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Shajkumar, Aruni, i Ananthakumar Ramadoss. "Recent Advancements in Photocatalytic Nanocomposites". W Research Anthology on Synthesis, Characterization, and Applications of Nanomaterials, 952–72. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-8591-7.ch039.

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Photocatalysts utilize light energy or photons to catalyze a reaction. The most significant characteristics of a photocatalyst lies in its ability to simultaneously oxidize a donor molecule and reduce an acceptor through the electron-hole pair generated upon excitation. With the emergence of nanotechnology, the utilization of nanomaterials for their photocatalytic properties has gained a new pace. TiO2 and ZnO nanoparticles are exploited widely for their photocatalytic properties. The recent trends concentrate on devising composite nanostructures that utilize both the properties of the photocatalyst and supporting materials such as graphene, carbon nanotubes, or noble metal nanoparticles to enhance the photocatalytic properties of the semiconductor metal oxide. The main areas of application of such structures lie in the field of water purification and energy harvesting. This chapter outlines an overview of the photocatalytic process and the existing technologies followed by the application areas and the recent advancements lying in that area.

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Shajkumar, Aruni, i Ananthakumar Ramadoss. "Recent Advancements in Photocatalytic Nanocomposites". W Diverse Applications of Organic-Inorganic Nanocomposites, 136–61. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-1530-3.ch006.

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Grover, Aman, Irshad Mohiuddin, Shikha Bhogal, Ashok Kumar Malik i Jatinder Singh Aulakh. "Nanostructure Impregnated MOFs for Photo-catalytic and Sensing Applications". W Synthesis and Applications of Semiconductor Nanostructures, 122–43. BENTHAM SCIENCE PUBLISHERS, 2023. http://dx.doi.org/10.2174/9789815080117123040011.

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Metal-organic frameworks (MOFs), due to their high porosity, enhanced surface area, rich topology, diverse structures and controllable chemical structures, have recently emerged as an exciting class of porous crystalline materials. The integration of nanostructures with MOFs generates MOF composites with synergistic properties and functions, attracting the broad application prospect. In this chapter, the primary strategies guiding the design of these materials, including MOFs, are described as host materials that contain and stabilize guest nanoparticles. A detailed discussion about the recent progress of nanostructure-impregnated MOFs based on diverse photocatalytic (e.g., environmental remediation, oxidation of alcohols, CO2 reduction, and H2 generation) and sensing (organic pollutants, gaseous pollutants, and heavy metal ions) applications has been provided. With a deeper knowledge of nanostructure-impregnated MOFs, this book chapter will provide better guidance for the rational design of high-performance MOF-based materials and is likely to shed new light on future research in this promising field.

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Panda, Debabrata, i Krunal M. Gangawane. "Next-Generation Energy Storage and Optoelectronic Nanodevices". W Current and Future Developments in Nanomaterials and Carbon Nanotubes, 223–39. BENTHAM SCIENCE PUBLISHERS, 2022. http://dx.doi.org/10.2174/9789815050714122030016.

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Among the variety of nanostructures that have been explored as a favorable material for the application of higher energy storage devices as supercapacitors, catalysts in high-performance batteries, proton exchange membranes in fuel cells, optoelectronic devices, and so on, 2D & 3D nanostructure of graphene-based derivatives, metal oxides and dichalcogenides have received the most potential attention for building high-performance nano-devices due to their extraordinary properties. Over the past decade, several efforts have been implemented to design, develop, and evaluate electrodes' structures for enhanced energy storage devices. A significant modification has achieved the remarkable performance of these synthesized devices in terms of energy storage capacity, conversion efficiency, and the reliability of the devices to meet practical applications' demands. Light-emitting diode (LED) in quantum well or quantum dots is considered an important aspect for an enhanced optoelectronic device. This current study outlines different 3D nanostructures for next generation energy storage devices. It provides a systematic summary of the advantages of 3D nanostructures in perspective to next-generation energy storage devices, photocatalytic devices, solar cells, a counter electrode for metal-ion batteries, and supercapacitors, optoelectronic nano-devices.

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Singh Grover, Inderpreet, i Rajeev Sharma. "Titania Nanoparticles: Electronic, Surface and Morphological Modifications for Photocatalytic Removal of Pesticides and Polycyclic Aromatic Hydrocarbons". W Synthesis and Applications of Semiconductor Nanostructures, 58–78. BENTHAM SCIENCE PUBLISHERS, 2023. http://dx.doi.org/10.2174/9789815080117123040008.

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Tailoring the electronic, surface and morphological properties alter the catalytic properties of the material(s), specifically at the nanoscale. In the past years, a plethora of research has been reported to find sustainable and eco-friendly catalysts for environmental pollution remediation. In this direction, titania nanoparticles have been intensively explored to check their potential for photocatalytic removal of various pollutants. In the current scenario, where the growing population needs to feed on an everyday basis, abundant pesticides indiscriminately are being used to increase crop yield, thus causing environmental pollution and ecological imbalance. In order to remove these environmental pollutants along with the polycyclic aromatic hydrocarbons (PAHs) that are formed by incomplete combustion of crop residue or any other organic matter have been studied, and the results reported for these two categories of pollutants are summarized in this chapter.

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Streszczenia konferencji na temat "Photocatalytic Properties - Nanostructures"

Ranjith, K. S., R. T. Rajendra Kumar, Alka B. Garg, R. Mittal i R. Mukhopadhyay. "Morphology Dependent Photocatalytic Properties of ZnO Nanostructures". W SOLID STATE PHYSICS, PROCEEDINGS OF THE 55TH DAE SOLID STATE PHYSICS SYMPOSIUM 2010. AIP, 2011. http://dx.doi.org/10.1063/1.3605919.

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Budhiraja, Narender, Sapna, Vinod Kumar, Monika Tomar, Vinay Gupta i S. K. Singh. "Structural, optical and photocatalytic properties of ZnO nanostructures". W NATIONAL CONFERENCE ON RECENT ADVANCES IN EXPERIMENTAL AND THEORETICAL PHYSICS (RAETP-2018). Author(s), 2018. http://dx.doi.org/10.1063/1.5051302.

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Bharathkumar, S., M. Sakar i S. Balakumar. "Fabrication of BiFeO3 nanostructures and their visible light photocatalytic degradation and water splitting properties". W DAE SOLID STATE PHYSICS SYMPOSIUM 2018. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5113006.

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Nirmal, R. Marx, P. Paulraj, K. Pandian, K. Sivakumar, P. Predeep, Mrinal Thakur i M. K. Ravi Varma. "Preparation, Characterization and Photocatalytic Properties of CdS and Cd[sub 1−x]Zn[sub x]S nanostructures". W OPTICS: PHENOMENA, MATERIALS, DEVICES, AND CHARACTERIZATION: OPTICS 2011: International Conference on Light. AIP, 2011. http://dx.doi.org/10.1063/1.3643622.

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Chen, Yen-Shin, Bo-Kai Chao, Tadaaki Nagao i Chun-Hway Hsueh. "Improvement of Photocatalytic Efficiency by Adding Ag Nanoparticles and Reduced Graphene Oxide to TiO2". W JSAP-OSA Joint Symposia. Washington, D.C.: Optica Publishing Group, 2017. http://dx.doi.org/10.1364/jsap.2017.5p_a410_12.

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Titanium dioxide (TiO2) is the commonly used photocatalyst. However, because only a small ultraviolet portion of solar spectrum can excite the electron-hole pairs resulting from the large band gap (3.2 eV) [1] and the recombination rate is high, its efficiency is restrained. To overcome this drawback, we added silver nanoparticles and reduced graphene oxide (RGO) to construct the ternary plasmonic catalyst to improve the catalytic performance of TiO2 nanopowder (P25). We prepared three different geometries of Ag nanostructures including sphere, decahedron and prism because the plasmon resonance properties of Ag could be controlled by the morphology of Ag nanoparticle, which shows characteristic strong localized surface plasmon resonance (LSPR) leading to an increase in light absorption [2]. The incorporated RGO inhibited the charge recombination and enhanced the electron-hole separation. In this study, Ag nanodecahedrons/P25/RGO and Ag nano-prisms/P25/RGO hybrid photocatalysts possessed remarkable photocatalytic activity, which displayed over 8 times higher photocatalytic efficiency than the P25 photocatalyst.

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Un, Leng-Wai, i Yonatan Sivan. "Photothermal effects in plasmonic assisted photocatalysis: a parametric study". W Photonic and Phononic Properties of Engineered Nanostructures XI, redaktorzy Ali Adibi, Shawn-Yu Lin i Axel Scherer. SPIE, 2021. http://dx.doi.org/10.1117/12.2582733.

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Hawkins, A., D. Guo, A. Steeves, F. Variola i B. Jodoin. "Production of Titanium Dioxide with Optimum Heterojunctions and Coating Production via Cold Spray". W ITSC2022. DVS Media GmbH, 2022. http://dx.doi.org/10.31399/asm.cp.itsc2022p0483.

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Abstract Titanium dioxide (TiO2) coatings possess high appeal due to self-cleaning properties that can accelerate decomposition of organic pollutants. The global objective is to develop a cold sprayable feedstock powder with an outer titanium dioxide shell that maximises anatase-rutile heterojunctions for enhanced photocatalytic activity under ultraviolet light and the development of cold spray process parameters for successful deposition of this powder into thin photocatalytic coatings. The objective of this reported first step of our global research effort to produce superior photocatalytic TiO2 coatings by cold spray is to successfully engineer anatase and rutile nanostructure heterojunction shells on pure titanium (CP-Ti) powder known to be easily sprayable by cold spray and then verify its photocatalytic properties through exposure to an organic pollutant, methylene blue (MB). Anatase and rutile heterojunctions are desired due to high activity, stability and broadened bandwidth as opposed to each singular nanostructure. The resulting powder coming out of this first step was characterized using Raman spectroscopy to verify the presence of the desired heterojunctions. The photocatalytic reactivity was tested and evaluated through the degradation of methylene blue upon contact with the TiO2 powder. Results of this first step showed growth of desired heterojunctions and high reactivity of the produced powder.

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Toma, F. L., S. O. Chwa, G. Bertrand, H. Liao, D. Klein i C. Coddet. "Photocatalytic Properties of Nanostructured TiO2 and TiO2-Al Coatings Elaborated by HVOF Spraying". W ITSC2005, redaktor E. Lugscheider. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2005. http://dx.doi.org/10.31399/asm.cp.itsc2005p0772.

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Abstract In the present study, TiO2 and TiO2-Al composite coatings were prepared by HVOF spraying using reconstituted nanosized feedstock powders prepared via the spray drying technique. In the flame, the powders were injected by two methods: internal injection i.e. as in conventional HVOF process and external injection i.e. outside the torch nozzle. The microstructure of the coatings was characterized by scanning electron microscopy and X-ray diffraction. It was found that the amount of anatase in the coatings depends on the nature of the powder and also on the type of the injection method. The coatings were tested for their photocatalytic properties regarding the conversion rate of nitrogen oxides. Coatings elaborated by external injection presented a better photocatalytic activity than those obtained by the conventional HVOF process.

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Zhou, H., W. Martens, T. Tesfamichael, G. Will, A. Hu i J. M. Bell. "Microstructures and photocatalytic properties of nitrogen-implanted titania nanostructured films". W Microelectronics, MEMS, and Nanotechnology, redaktorzy Jung-Chih Chiao, Andrew S. Dzurak, Chennupati Jagadish i David V. Thiel. SPIE, 2005. http://dx.doi.org/10.1117/12.638195.

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Edalati, K. "Ultra-severe plastic deformation for room-temperature superplasticity and superfunctionality". W Superplasticity in Advanced Materials. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902615-4.

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Abstract. Ultra-severe plastic deformation (ulta-SPD) is a terminology used for the introduction of extremely large shear strains (over 1000) to material so that the thickness of sheared phases geometrically reaches the subnanometer level. Under such extreme shearing conditions, new nanostructured phases with unique properties are formed even from the immiscible systems. Various metallic alloys and ceramics were developed by this concept for different applications such as room-temperature superplasticity, room-temperature hydrogen storage, photocatalytic hydrogen production, photocatalytic carbon dioxide conversion, etc. This article reviews recent advances regarding ultra-SPD with a focus on low-temperature superplasticity, which was reported for the first time at room temperature in aluminum and magnesium alloys.

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