1
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Ibrahem MA, Verrelli E, Adawi AM, Bouillard JSG, O’Neill M. Plasmons Enhancing Sub-Bandgap Photoconductivity in TiO 2 Nanoparticles Film. ACS OMEGA 2024; 9:10169-10176. [PMID: 38463264 PMCID: PMC10918839 DOI: 10.1021/acsomega.3c06932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/11/2023] [Revised: 01/16/2024] [Accepted: 01/24/2024] [Indexed: 03/12/2024]
Abstract
The coupling between sub-bandgap defect states and surface plasmon resonances in Au nanoparticles and its effects on the photoconductivity performance of TiO2 are investigated in both the ultraviolet (UV) and visible spectrum. Incorporating a 2 nm gold nanoparticle layer in the photodetector device architecture creates additional trapping pathways, resulting in a faster current decay under UV illumination and a significant enhancement in the visible photocurrent of TiO2, with an 8-fold enhancement of the defects-related photocurrent. We show that hot electron injection (HEI) and plasmonic resonance energy transfer (PRET) jointly contribute to the observed photoconductivity enhancement. In addition to shedding light on the below-band-edge photoconductivity of TiO2, our work provides insight into new methods to probe and examine the surface defects of metal oxide semiconductors using plasmonic resonances.
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Affiliation(s)
- Mohammed A. Ibrahem
- Laser
Sciences and Technology Branch, Applied Sciences Department, University of Technology, Al-Sinaa Street, Baghdad 10066, Iraq
- UNAM-Institute
of Materials Science and Nanotechnology and National Nanotechnology
Research Center, Bilkent University, Ankara 06800, Turkey
| | - Emanuele Verrelli
- Department
of Physics and Mathematics, University of
Hull, Cottingham Road, Kingston upon Hull HU6 7RX, United
Kingdom
| | - Ali M. Adawi
- Department
of Physics and Mathematics, University of
Hull, Cottingham Road, Kingston upon Hull HU6 7RX, United
Kingdom
| | - Jean-Sebastien G. Bouillard
- Department
of Physics and Mathematics, University of
Hull, Cottingham Road, Kingston upon Hull HU6 7RX, United
Kingdom
| | - Mary O’Neill
- School
of Science and Technology, Nottingham Trent
University, Clifton Lane, Nottingham NG11 8NS, United Kingdom
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2
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Machreki M, Chouki T, Tyuliev G, Fanetti M, Valant M, Arčon D, Pregelj M, Emin S. The Role of Lattice Defects on the Optical Properties of TiO 2 Nanotube Arrays for Synergistic Water Splitting. ACS OMEGA 2023; 8:33255-33265. [PMID: 37744782 PMCID: PMC10515401 DOI: 10.1021/acsomega.3c00965] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Accepted: 08/08/2023] [Indexed: 09/26/2023]
Abstract
In this study, we report a facile one-step chemical method to synthesize reduced titanium dioxide (TiO2) nanotube arrays (NTAs) with point defects. Treatment with NaBH4 introduces oxygen vacancies (OVs) in the TiO2 lattice. Chemical analysis and optical studies indicate that the OV density can be significantly increased by changing reduction time treatment, leading to higher optical transmission of the TiO2 NTAs and retarded carrier recombination in the photoelectrochemical process. A cathodoluminescence (CL) study of reduced TiO2 (TiO2-x) NTAs revealed that OVs contribute significantly to the emission bands in the visible range. It was found that the TiO2 NTAs reduced for a longer duration exhibited a higher concentration of OVs. A typical CL spectrum of TiO2 was deconvoluted to four Gaussian components, assigned to F, F+, and Ti3+ centers. X-ray photoelectron spectroscopy measurements were used to support the change in the surface chemical bonding and electronic valence band position in TiO2. Electron paramagnetic resonance spectra confirmed the presence of OVs in the TiO2-x sample. The prepared TiO2-x NTAs show an enhanced photocurrent for water splitting due to pronounced light absorption in the visible region, enhanced electrical conductivity, and improved charge transportation.
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Affiliation(s)
- Manel Machreki
- Materials
Research Laboratory, University of Nova
Gorica, Vipavska 11c, 5270 Ajdovščina, Slovenia
| | - Takwa Chouki
- Materials
Research Laboratory, University of Nova
Gorica, Vipavska 11c, 5270 Ajdovščina, Slovenia
| | - Georgi Tyuliev
- Institute
of Catalysis, Bulgarian Academy of Sciences, Acad. G. Bonchev St., Bldg. 11, Sofia 1113, Bulgaria
| | - Mattia Fanetti
- Materials
Research Laboratory, University of Nova
Gorica, Vipavska 11c, 5270 Ajdovščina, Slovenia
| | - Matjaž Valant
- Materials
Research Laboratory, University of Nova
Gorica, Vipavska 11c, 5270 Ajdovščina, Slovenia
| | - Denis Arčon
- Institute
“Jožef Stefan”, Jamova 39, 1000 Ljubljana, Slovenia
- Faculty
of Mathematics and Physics, University of
Ljubljana, Jadranska
c. 19, SI-1000 Ljubljana, Slovenia
| | - Matej Pregelj
- Institute
“Jožef Stefan”, Jamova 39, 1000 Ljubljana, Slovenia
| | - Saim Emin
- Materials
Research Laboratory, University of Nova
Gorica, Vipavska 11c, 5270 Ajdovščina, Slovenia
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3
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Henrotte O, Kment Š, Naldoni A. Interfacial States in Au/Reduced TiO 2 Plasmonic Photocatalysts Quench Hot-Carrier Photoactivity. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2023; 127:15861-15870. [PMID: 37609381 PMCID: PMC10441571 DOI: 10.1021/acs.jpcc.3c04176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Revised: 07/24/2023] [Indexed: 08/24/2023]
Abstract
Understanding the interface of plasmonic nanostructures is essential for improving the performance of photocatalysts. Surface defects in semiconductors modify the dynamics of charge carriers, which are not well understood yet. Here, we take advantage of scanning photoelectrochemical microscopy (SPECM) as a fast and effective tool for detecting the impact of surface defects on the photoactivity of plasmonic hybrid nanostructures. We evidenced a significant photoactivity activation of TiO2 ultrathin films under visible light upon mild reduction treatment. Through Au nanoparticle (NP) arrays deposited on different reduced TiO2 films, the plasmonic photoactivity mapping revealed the effect of interfacial defects on hot charge carriers, which quenched the plasmonic activity by (i) increasing the recombination rate between hot charge carriers and (ii) leaking electrons (injected and generated in TiO2) into the Au NPs. Our results show that the catalyst's photoactivity depends on the concentration of surface defects and the population distribution of Au NPs. The present study unlocks the fast and simple detection of the surface engineering effect on the photocatalytic activity of plasmonic semiconductor systems.
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Affiliation(s)
- Olivier Henrotte
- Czech Advanced Technology and Research Institute, Regional Centre of Advanced Technologies and Materials Department, Palacký University Olomouc, Šlechtitelů 27, Olomouc 78371, Czech Republic
| | - Štěpán Kment
- Czech Advanced Technology and Research Institute, Regional Centre of Advanced Technologies and Materials Department, Palacký University Olomouc, Šlechtitelů 27, Olomouc 78371, Czech Republic
- CEET, Nanotechnology Centre, VŠB-Technical University of Ostrava, 17. Listopadu 2172/15, Ostrava-Poruba 708 00, Czech Republic
| | - Alberto Naldoni
- Czech Advanced Technology and Research Institute, Regional Centre of Advanced Technologies and Materials Department, Palacký University Olomouc, Šlechtitelů 27, Olomouc 78371, Czech Republic
- Department of Chemistry and NIS Centre, University of Turin, Turin 10125, Italy
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4
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Albornoz Marin SL, de Oliveira SC, Peralta-Zamora P. Photocatalytic degradation of phenol by core–shell Cu@TiO2 nanostructures under visible radiation. J Photochem Photobiol A Chem 2022. [DOI: 10.1016/j.jphotochem.2022.114129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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5
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Maarisetty D, Mary R, Hang DR, Mohapatra P, Baral SS. The role of material defects in the photocatalytic CO2 reduction: Interfacial properties, thermodynamics, kinetics and mechanism. J CO2 UTIL 2022. [DOI: 10.1016/j.jcou.2022.102175] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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6
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Brognara A, Bricchi BR, William L, Brinza O, Konstantakopoulou M, Bassi AL, Ghidelli M, Lidgi-Guigui N. New Mechanism for Long Photo-Induced Enhanced Raman Spectroscopy in Au Nanoparticles Embedded in TiO 2. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2201088. [PMID: 35616163 DOI: 10.1002/smll.202201088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Revised: 04/27/2022] [Indexed: 06/15/2023]
Abstract
The photo-induced enhanced Raman spectroscopy (PIERS) effect is a phenomenon taking place when plasmonic nanoparticles deposited on a semiconductor are illuminated by UV light prior to Raman measurement. Results from the literature show that the PIERS effect lasts for about an hour. The proposed mechanism for this effect is the creation of oxygen vacancies in the semiconductor that would create a path for charge transfer between the analyte and the nanoparticles. However, this hypothesis has never been confirmed experimentally. Furthermore, the tested structure of the PIERS substrate has always been composed of plasmonic nanoparticles deposited on top of the semiconductor. Here, gold nanoparticles co-deposited with porous TiO2 are used as a PIERS substrate. The deposition process confers the nanoparticles a unique position half buried in the nanoporous semiconductor. The resulting PIERS intensity is among the highest measured until now but most importantly the duration of the effect is significantly longer (at least 8 days). Cathodoluminescence measurements on these samples show that two distinct mechanisms are at stake for co-deposited and drop-casted gold nanoparticles. The oxygen vacancies hypothesis tends to be confirmed for the latter, but the narrowing of the depletion zone explains the long PIERS effect.
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Affiliation(s)
- Andrea Brognara
- Dipartimento di Energia, Micro and Nanostructured Materials Laboratory, Politecnico di Milano, via Ponzio 34/3, Milano, I-20133, Italy
- Department of Structure and Nano/-Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straße 1, 40237, Düsseldorf, Germany
| | - Beatrice R Bricchi
- Dipartimento di Energia, Micro and Nanostructured Materials Laboratory, Politecnico di Milano, via Ponzio 34/3, Milano, I-20133, Italy
| | - Ludovic William
- Laboratoire des Sciences des Procédés et des Matériaux (LSPM), CNRS, Université Sorbonne Paris Nord, Villetaneuse, 93430, France
| | - Ovidiu Brinza
- Laboratoire des Sciences des Procédés et des Matériaux (LSPM), CNRS, Université Sorbonne Paris Nord, Villetaneuse, 93430, France
| | - Maria Konstantakopoulou
- Laboratoire des Sciences des Procédés et des Matériaux (LSPM), CNRS, Université Sorbonne Paris Nord, Villetaneuse, 93430, France
| | - Andrea Li Bassi
- Dipartimento di Energia, Micro and Nanostructured Materials Laboratory, Politecnico di Milano, via Ponzio 34/3, Milano, I-20133, Italy
| | - Matteo Ghidelli
- Dipartimento di Energia, Micro and Nanostructured Materials Laboratory, Politecnico di Milano, via Ponzio 34/3, Milano, I-20133, Italy
- Department of Structure and Nano/-Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straße 1, 40237, Düsseldorf, Germany
- Laboratoire des Sciences des Procédés et des Matériaux (LSPM), CNRS, Université Sorbonne Paris Nord, Villetaneuse, 93430, France
| | - Nathalie Lidgi-Guigui
- Laboratoire des Sciences des Procédés et des Matériaux (LSPM), CNRS, Université Sorbonne Paris Nord, Villetaneuse, 93430, France
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7
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Yu X, Huang J, Zhao J, Zhou C, Xin C, Guo Q. Topotactic formation of poriferous (Al,C)-Ta 2O 5 mesocrystals for improved visible-light photocatalysis. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2022; 304:114289. [PMID: 34929428 DOI: 10.1016/j.jenvman.2021.114289] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2021] [Revised: 12/03/2021] [Accepted: 12/10/2021] [Indexed: 06/14/2023]
Abstract
Poriferous monocrystal-like nanostructures are contributing to fabricate long-distance charge transfer pathways and rapid diffusions of the degraded products, and attracts wide attentions. In this work, layered and poriferous (Al,C)-Ta2O5 mesocrystals were fabricated by topotactic transformation strategy with Ta4AlC3 MAX as starting materials for visible-light photocatalytic antibiotic degradation. The prepared sample exhibited enhanced visible-light absorption and visible-light photocatalytic performance, far superior to those of commercial Ta2O5 and Ta4AlC3 MAX, which was mainly because of the elemental doping in the samples. The experimental results also indicated that continuous attacks of the photo-generated holes and ·O2- species efficiently induced efficient visible-light photodegradation of tetracycline. Current work also indicates a new and potential tantalum-based semiconductors for high-performance environmental photocatalysis.
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Affiliation(s)
- Xin Yu
- Henan Engineering Research Center of Resource & Energy Recovery from Waste, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, 475004, China.
| | - Jielin Huang
- Henan Engineering Research Center of Resource & Energy Recovery from Waste, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, 475004, China
| | - Jiawei Zhao
- Henan Engineering Research Center of Resource & Energy Recovery from Waste, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, 475004, China
| | - Chao Zhou
- Henan Engineering Research Center of Resource & Energy Recovery from Waste, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, 475004, China
| | - Changhui Xin
- Henan Engineering Research Center of Resource & Energy Recovery from Waste, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, 475004, China
| | - Quanhui Guo
- Henan Engineering Research Center of Resource & Energy Recovery from Waste, College of Chemistry and Chemical Engineering, Henan University, Kaifeng, 475004, China.
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8
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9
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Villani M, Rossi F, Calestani D, Salviati G, Fabbri F. Evaluating the plasmon-exciton interaction in ZnO tetrapods coupled with gold nanostructures by nanoscale cathodoluminescence. NANO EXPRESS 2021. [DOI: 10.1088/2632-959x/abe277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Abstract
Plasmon-exciton coupling is gaining increasing interest for enhancing the performance of optoelectronic, photonic and photo-catalytic devices. Herein we evaluate the interaction of excitons in zinc oxide tetrapods with surface plasmons of gold nanostructures with different morphologies. The gold nanostructures are grown in situ on ZnO tetrapods by means of a photochemical process, resulting in clean interfaces. The modification of the synthesis parameters results in different morphologies, as isolated nanoparticles, nano-domes or nanoparticles aggregates. Plasmon-exciton interaction is evaluated by means of cathodoluminescence spectroscopy and mapping at the nanoscale. The ZnO excitonic emission is strongly blue-shifted and broadened in close proximity of the gold nanostructures. This effect is explained by the formation of a Schottky barrier that is strongly mediated by the morphology of metal nanostructures.
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10
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Shahvaranfard F, Ghigna P, Minguzzi A, Wierzbicka E, Schmuki P, Altomare M. Dewetting of PtCu Nanoalloys on TiO 2 Nanocavities Provides a Synergistic Photocatalytic Enhancement for Efficient H 2 Evolution. ACS APPLIED MATERIALS & INTERFACES 2020; 12:38211-38221. [PMID: 32706239 DOI: 10.1021/acsami.0c10968] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We investigate the co-catalytic activity of PtCu alloy nanoparticles for photocatalytic H2 evolution from methanol-water solutions. To produce the photocatalysts, a few-nanometer-thick Pt-Cu bilayers are deposited on anodic TiO2 nanocavity arrays and converted by solid-state dewetting via a suitable thermal treatment into bimetallic PtCu nanoparticles. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) results prove the formation of PtCu nanoalloys that carry a shell of surface oxides. X-ray absorption near-edge structure (XANES) data support Pt and Cu alloying and indicate the presence of lattice disorder in the PtCu nanoparticles. The PtCu co-catalyst on TiO2 shows a synergistic activity enhancement and a significantly higher activity toward photocatalytic H2 evolution than Pt- or Cu-TiO2. We propose the enhanced activity to be due to Pt-Cu electronic interactions, where Cu increases the electron density on Pt, favoring a more efficient electron transfer for H2 evolution. In addition, Cu can further promote the photoactivity by providing additional surface catalytic sites for hydrogen recombination. Remarkably, when increasing the methanol concentration up to 50 vol % in the reaction phase, we observe for PtCu-TiO2 a steeper activity increase compared to Pt-TiO2. A further increase in methanol concentration (up to 80 vol %) causes for Pt-TiO2 a clear activity decay, while PtCu-TiO2 still maintains a high level of activity. This suggests improved robustness of PtCu nanoalloys against poisoning from methanol oxidation products such as CO.
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Affiliation(s)
- Fahimeh Shahvaranfard
- Institute for Surface Science and Corrosion WW4-LKO, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Martensstrasse 7, 91058 Erlangen, Germany
| | - Paolo Ghigna
- Dipartimento di Chimica, Università degli Studi di Pavia, Viale Taramelli 13, 27100 Pavia, Italy
| | - Alessandro Minguzzi
- Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, 20133 Milan, Italy
| | - Ewa Wierzbicka
- Institute for Surface Science and Corrosion WW4-LKO, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Martensstrasse 7, 91058 Erlangen, Germany
| | - Patrik Schmuki
- Institute for Surface Science and Corrosion WW4-LKO, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Martensstrasse 7, 91058 Erlangen, Germany
- Chemistry Department, Faculty of Sciences, King Abdulaziz University, 80203 Jeddah, Kingdom of Saudi Arabia
| | - Marco Altomare
- Institute for Surface Science and Corrosion WW4-LKO, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Martensstrasse 7, 91058 Erlangen, Germany
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11
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12
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Coupling Plasmonic and Cocatalyst Nanoparticles on N⁻TiO₂ for Visible-Light-Driven Catalytic Organic Synthesis. NANOMATERIALS 2019; 9:nano9030391. [PMID: 30866493 PMCID: PMC6473962 DOI: 10.3390/nano9030391] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Revised: 02/27/2019] [Accepted: 03/01/2019] [Indexed: 12/31/2022]
Abstract
The use of the surface plasmon resonance (SPR) effect of plasmonic metal nanocomposites to promote photocarrier generation is a strongly emerging field for improving the catalytic performance under visible-light irradiation. In this study, a novel plasmonic photocatalyst, AuPt/N–TiO2, was prepared via a photo-deposition–calcination technique. The Au nanoparticles (NPs) were used herein to harvest visible-light energy via the SPR effect, and Pt NPs were employed as a cocatalyst for trapping the energetic electrons from the semiconductor, leading to a high solar-energy conversion efficiency. The Au2Pt2/N–TiO2 catalyst, herein with the irradiation wavelength in the range 460–800 nm, exhibited a reaction rate ~24 times greater than that of TiO2, and the apparent quantum yield at 500 nm reached 5.86%, indicative of the successful functionalization of N–TiO2 by the integration of Au plasmonic NPs and the Pt cocatalyst. Also, we investigated the effects of two parameters, light source intensity and wavelength, in photocatalytic reactions. It is indicated that the as-prepared AuPt/N–TiO2 photocatalyst can cause selective oxidation of benzyl alcohol under visible-light irradiation with a markedly enhanced selectivity and yield.
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13
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Naldoni A, Altomare M, Zoppellaro G, Liu N, Kment Š, Zbořil R, Schmuki P. Photocatalysis with Reduced TiO 2: From Black TiO 2 to Cocatalyst-Free Hydrogen Production. ACS Catal 2019; 9:345-364. [PMID: 30701123 PMCID: PMC6344061 DOI: 10.1021/acscatal.8b04068] [Citation(s) in RCA: 207] [Impact Index Per Article: 41.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Revised: 11/26/2018] [Indexed: 12/22/2022]
Abstract
Black TiO2 nanomaterials have recently emerged as promising candidates for solar-driven photocatalytic hydrogen production. Despite the great efforts to synthesize highly reduced TiO2, it is apparent that intermediate degree of reduction (namely, gray titania) brings about the formation of peculiar defective catalytic sites enabling cocatalyst-free hydrogen generation. A precise understanding of the structural and electronic nature of these catalytically active sites is still elusive, as well as the fundamental structure-activity relationships that govern formation of crystal defects, increased light absorption, charge separation, and photocatalytic activity. In this Review, we discuss the basic concepts that underlie an effective design of reduced TiO2 photocatalysts for hydrogen production such as (i) defects formation in reduced TiO2, (ii) analysis of structure deformation and presence of unpaired electrons through electron paramagnetic resonance spectroscopy, (iii) insights from surface science on electronic singularities due to defects, and (iv) the key differences between black and gray titania, that is, photocatalysts that require Pt-modification and cocatalyst-free photocatalytic hydrogen generation. Finally, future directions to improve the performance of reduced TiO2 photocatalysts are outlined.
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Affiliation(s)
- Alberto Naldoni
- Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacký University Olomouc, Šlechtitelů 27, 78371 Olomouc, Czech Republic
| | - Marco Altomare
- Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Martensstrasse 7, D-91058 Erlangen, Germany
| | - Giorgio Zoppellaro
- Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacký University Olomouc, Šlechtitelů 27, 78371 Olomouc, Czech Republic
| | - Ning Liu
- Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Martensstrasse 7, D-91058 Erlangen, Germany
| | - Štěpán Kment
- Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacký University Olomouc, Šlechtitelů 27, 78371 Olomouc, Czech Republic
| | - Radek Zbořil
- Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacký University Olomouc, Šlechtitelů 27, 78371 Olomouc, Czech Republic
| | - Patrik Schmuki
- Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacký University Olomouc, Šlechtitelů 27, 78371 Olomouc, Czech Republic
- Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Martensstrasse 7, D-91058 Erlangen, Germany
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14
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Xue J, Elbanna O, Kim S, Fujitsuka M, Majima T. Defect state-induced efficient hot electron transfer in Au nanoparticles/reduced TiO2 mesocrystal photocatalysts. Chem Commun (Camb) 2018; 54:6052-6055. [DOI: 10.1039/c8cc02853b] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Defect states assist hot electrons with energies lower than the Schottky barrier in transferring from Au nanoparticles to TiO2.
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Affiliation(s)
- Jiawei Xue
- The Institute of Scientific and Industrial Research (SANKEN)
- Osaka University
- Osaka 567-0047
- Japan
| | - Ossama Elbanna
- The Institute of Scientific and Industrial Research (SANKEN)
- Osaka University
- Osaka 567-0047
- Japan
| | - Sooyeon Kim
- The Institute of Scientific and Industrial Research (SANKEN)
- Osaka University
- Osaka 567-0047
- Japan
| | - Mamoru Fujitsuka
- The Institute of Scientific and Industrial Research (SANKEN)
- Osaka University
- Osaka 567-0047
- Japan
| | - Tetsuro Majima
- The Institute of Scientific and Industrial Research (SANKEN)
- Osaka University
- Osaka 567-0047
- Japan
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15
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Maqbool Q, Srivastava A. Benign Synthesis of Black Microspheres of Anatase TiO2
with Paramagnetic Oxygen Vacancies through NH3
Treatment. Chemistry 2017; 23:13864-13868. [PMID: 28833702 DOI: 10.1002/chem.201702343] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Indexed: 11/06/2022]
Affiliation(s)
- Qysar Maqbool
- Department of Chemistry; Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal-Bypass Road, Bhauri, Bhopal; 462066 Madhya Pradesh India
| | - Aasheesh Srivastava
- Department of Chemistry; Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal-Bypass Road, Bhauri, Bhopal; 462066 Madhya Pradesh India
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16
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Cha G, Altomare M, Truong Nguyen N, Taccardi N, Lee K, Schmuki P. Double-Side Co-Catalytic Activation of Anodic TiO2Nanotube Membranes with Sputter-Coated Pt for Photocatalytic H2Generation from Water/Methanol Mixtures. Chem Asian J 2016; 12:314-323. [DOI: 10.1002/asia.201601356] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2016] [Revised: 11/24/2016] [Indexed: 01/03/2023]
Affiliation(s)
- Gihoon Cha
- Department of Materials Science and Engineering WW4-LKO; University of Erlangen-Nuremberg; Martensstrasse 7 Erlangen 91058 Germany
| | - Marco Altomare
- Department of Materials Science and Engineering WW4-LKO; University of Erlangen-Nuremberg; Martensstrasse 7 Erlangen 91058 Germany
| | - Nhat Truong Nguyen
- Department of Materials Science and Engineering WW4-LKO; University of Erlangen-Nuremberg; Martensstrasse 7 Erlangen 91058 Germany
| | - Nicola Taccardi
- Lehrstuhl für Chemische Reaktionstechnik; University of Erlangen-Nuremberg; Egerlandstraße 3 91058 Erlangen Germany
| | - Kiyoung Lee
- Department of Energy Chemical Engineering; School of Nano&Materials Science and Engineering; Kyungpook National University; South Korea
| | - Patrik Schmuki
- Department of Materials Science and Engineering WW4-LKO; University of Erlangen-Nuremberg; Martensstrasse 7 Erlangen 91058 Germany
- Department of Chemistry; King Abdulaziz University; 21589 Jeddah Saudi Arabia
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17
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Altomare M, Nguyen NT, Schmuki P. Templated dewetting: designing entirely self-organized platforms for photocatalysis. Chem Sci 2016; 7:6865-6886. [PMID: 28567258 PMCID: PMC5450593 DOI: 10.1039/c6sc02555b] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Accepted: 08/06/2016] [Indexed: 11/26/2022] Open
Abstract
Formation and dispersion of metal nanoparticles on oxide surfaces in site-specific or even arrayed configuration are key in various technological processes such as catalysis, photonics, electrochemistry and for fabricating electrodes, sensors, memory devices, and magnetic, optical, and plasmonic platforms. A crucial aspect towards an efficient performance of many of these metal/metal oxide arrangements is a reliable fabrication approach. Since the early works on graphoepitaxy in the 70s, solid state dewetting of metal films on patterned surfaces has been much explored and regarded as a most effective tool to form defined arrays of ordered metal particles on a desired substrate. While templated dewetting has been studied in detail, particularly from a mechanistic perspective on lithographically patterned Si surfaces, the resulting outstanding potential of its applications on metal oxide semiconductors, such as titania, has received only limited attention. In this perspective we illustrate how dewetting and particularly templated dewetting can be used to fabricate highly efficient metal/TiO2 photocatalyst assemblies e.g. for green hydrogen evolution. A remarkable advantage is that the synthesis of such photocatalysts is completely based on self-ordering principles: anodic self-organized TiO2 nanotube arrays that self-align to a highest degree of hexagonal ordering are an ideal topographical substrate for a second self-ordering process, that is, templated-dewetting of sputter-deposited metal thin films. The controllable metal/semiconductor coupling delivers intriguing features and functionalities. We review concepts inherent to dewetting and particularly templated dewetting, and outline a series of effective tools that can be synergistically interlaced to reach fine control with nanoscopic precision over the resulting metal/TiO2 structures (in terms of e.g. high ordering, size distribution, site specific placement, alloy formation) to maximize their photocatalytic efficiency. These processes are easy to scale up and have a high throughput and great potential to be applied to fabricate not only (photo)catalytic materials but also a large palette of other functional nanostructured elements and devices.
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Affiliation(s)
- Marco Altomare
- Department of Materials Science , Institute for Surface Science and Corrosion WW4-LKO , University of Erlangen-Nuremberg , Martensstraße 7 , D-91058 Erlangen , Germany . ; ; Tel: +49 9131 8527575
| | - Nhat Truong Nguyen
- Department of Materials Science , Institute for Surface Science and Corrosion WW4-LKO , University of Erlangen-Nuremberg , Martensstraße 7 , D-91058 Erlangen , Germany . ; ; Tel: +49 9131 8527575
| | - Patrik Schmuki
- Department of Materials Science , Institute for Surface Science and Corrosion WW4-LKO , University of Erlangen-Nuremberg , Martensstraße 7 , D-91058 Erlangen , Germany . ; ; Tel: +49 9131 8527575
- Chemistry Department , Faculty of Sciences , King Abdulaziz University , 80203 Jeddah , Kingdom of Saudi Arabia
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18
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Marelli M, Evangelisti C, Diamanti MV, Dal Santo V, Pedeferri MP, Bianchi CL, Schiavi L, Strini A. TiO 2 Nanotubes Arrays Loaded with Ligand-Free Au Nanoparticles: Enhancement in Photocatalytic Activity. ACS APPLIED MATERIALS & INTERFACES 2016; 8:31051-31058. [PMID: 27767304 DOI: 10.1021/acsami.6b11436] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A new protocol to synthesize size-controlled Au nanoparticles (NPs) loaded onto vertically aligned anatase TiO2 nanotubes arrays (TNTAs) prepared by electrochemical anodization is reported. Ligand-free Au NPs (<10 nm) were deposited onto anatase TNTAs supports, finely tuning the Au loading by controlling the immersion time of the support into metal vapor synthesis (MVS)-derived Au-acetone solutions. The Au/TNTAs composites were characterized by electron microscopies (SEM, (S)TEM), X-ray diffraction, X-ray photoelectron spectroscopy, and UV-vis spectroscopy. Their photocatalytic efficiency was evaluated in toluene degradation in air under ambient conditions without thermal or chemical postsynthetic treatments. The role of Au loadings was pointed out, obtaining a three times enhancement of the pristine anatase TNTAs activity with the best sample containing 3.3 μg Au cm-2.
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Affiliation(s)
- Marcello Marelli
- Istituto di Scienze e Tecnologie Molecolari (ISTM-CNR) , Via C. Golgi 19, 20133 Milano, Italy
| | - Claudio Evangelisti
- Istituto di Scienze e Tecnologie Molecolari (ISTM-CNR) , Via C. Golgi 19, 20133 Milano, Italy
| | - Maria Vittoria Diamanti
- Department of Chemistry, Materials and Chemical Engineering "Giulio Natta", Politecnico di Milano ,Via Mancinelli 7, 20131 Milan, Italy
| | - Vladimiro Dal Santo
- Istituto di Scienze e Tecnologie Molecolari (ISTM-CNR) , Via C. Golgi 19, 20133 Milano, Italy
| | - Maria Pia Pedeferri
- Department of Chemistry, Materials and Chemical Engineering "Giulio Natta", Politecnico di Milano ,Via Mancinelli 7, 20131 Milan, Italy
| | - Claudia L Bianchi
- Dipartimento di Chimica, Università di Milano , Via Golgi 19, 20133 Milano, Italy
| | - Luca Schiavi
- Istituto per le Tecnologie della Costruzione (ITC-CNR) , via Lombardia, 49, San Giuliano Milanese, I-20098 Milan, Italy
| | - Alberto Strini
- Istituto per le Tecnologie della Costruzione (ITC-CNR) , via Lombardia, 49, San Giuliano Milanese, I-20098 Milan, Italy
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Siddiqi G, Mougel V, Copéret C. Highly Active Subnanometer Au Particles Supported on TiO2 for Photocatalytic Hydrogen Evolution from a Well-Defined Organogold Precursor, [Au5(mesityl)5]. Inorg Chem 2016; 55:4026-33. [DOI: 10.1021/acs.inorgchem.6b00341] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Georges Siddiqi
- Department of Chemistry and Applied Biosciences, ETH-Zürich, Vladimir
Prelog Weg 1-5, CH-8093 Zürich, Switzerland
| | - Victor Mougel
- Department of Chemistry and Applied Biosciences, ETH-Zürich, Vladimir
Prelog Weg 1-5, CH-8093 Zürich, Switzerland
| | - Christophe Copéret
- Department of Chemistry and Applied Biosciences, ETH-Zürich, Vladimir
Prelog Weg 1-5, CH-8093 Zürich, Switzerland
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20
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Okuno T, Kawamura G, Muto H, Matsuda A. Photocatalytic properties of Au-deposited mesoporous SiO2–TiO2 photocatalyst under simultaneous irradiation of UV and visible light. J SOLID STATE CHEM 2016. [DOI: 10.1016/j.jssc.2015.12.025] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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21
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Naldoni A, Riboni F, Marelli M, Bossola F, Ulisse G, Di Carlo A, Píš I, Nappini S, Malvestuto M, Dozzi MV, Psaro R, Selli E, Dal Santo V. Influence of TiO2electronic structure and strong metal–support interaction on plasmonic Au photocatalytic oxidations. Catal Sci Technol 2016. [DOI: 10.1039/c5cy01736j] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Photocatalytic oxidations promoted by hot electron transfer and PRET strongly depend on Au loading and SMSI.
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Affiliation(s)
- Alberto Naldoni
- CNR-Istituto di Scienze e Tecnologie Molecolari
- 20133 Milan
- Italy
| | - Francesca Riboni
- Dipartimento di Chimica
- Università degli Studi di Milano
- 20133 Milan
- Italy
| | | | - Filippo Bossola
- CNR-Istituto di Scienze e Tecnologie Molecolari
- 20133 Milan
- Italy
- Dipartimento di Scienza e Alte Tecnologie
- Università dell'Insubria
| | - Giacomo Ulisse
- University of Rome “Tor Vergata”
- Department of Electronic Engineering
- 00133 Rome
- Italy
| | - Aldo Di Carlo
- University of Rome “Tor Vergata”
- Department of Electronic Engineering
- 00133 Rome
- Italy
| | - Igor Píš
- Elettra-Sincrotrone Trieste S.C.p.A
- 34149 Trieste
- Italy
- IOM CNR
- Laboratorio TASC
| | | | | | | | - Rinaldo Psaro
- CNR-Istituto di Scienze e Tecnologie Molecolari
- 20133 Milan
- Italy
| | - Elena Selli
- Dipartimento di Chimica
- Università degli Studi di Milano
- 20133 Milan
- Italy
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22
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Wang F, Jiang Y, Lawes DJ, Ball GE, Zhou C, Liu Z, Amal R. Analysis of the Promoted Activity and Molecular Mechanism of Hydrogen Production over Fine Au–Pt Alloyed TiO2 Photocatalysts. ACS Catal 2015. [DOI: 10.1021/acscatal.5b00623] [Citation(s) in RCA: 96] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Fenglong Wang
- School
of Chemical Engineering, UNSW Australia, Sydney, New South Wales 2052, Australia
| | - Yijiao Jiang
- Department
of Engineering, Macquarie University, Sydney, New South Wales 2109, Australia
| | - Douglas J. Lawes
- Mark
Wainwright Analytical Centre, UNSW Australia, Sydney, New South Wales 2052, Australia
| | - Graham E. Ball
- School
of Chemistry, UNSW Australia, Sydney, New South Wales 2052, Australia
| | - Cuifeng Zhou
- School
of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Zongwen Liu
- School
of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Rose Amal
- School
of Chemical Engineering, UNSW Australia, Sydney, New South Wales 2052, Australia
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