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Hao J, Liu H, Wang K, Sun XW, Delville JP, Delville MH. Hole Scavenging and Electron-Hole Pair Photoproduction Rate: Two Mandatory Key Factors to Control Single-Tip Au-CdSe/CdS Nanoheterodimers. ACS NANO 2021; 15:15328-15341. [PMID: 34460229 DOI: 10.1021/acsnano.1c06383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Metal/semiconductor hetero-nanostructures are now considered as benchmark functional nanomaterials for many light-driven applications. Using laser-driven photodeposition to control growth of gold nanodots (NDs) onto CdSe/CdS dot-in-rods (DRs), we show that the addition of a dedicated hole scavenger (MeOH) is the cornerstone to significantly reduce to less than 3.5% the multiple-site nucleation and 2.5% the rate of gold-free DRs. This means, from a synthetic point of view, that rates up to 90% of single-tip DRs can be reproducibly achieved. Moreover, by systematically varying this hole scavenger concentration and the Au/DRs ratio on the one hand, and the irradiation intensity and the time exposure on the other hand, we explain how gold deposition switches from multisite to single-tipped and how the growth and final size of the single photodeposited ND can be controlled. A model also establishes that the results obtained based on these different varying conditions can be merged onto a single "master behavior" that summarizes and predicts the single-tip gold ND growth onto the CdSe/CdS DRs. We eventually use data from the literature on growth of platinum NDs onto CdS nanorods by laser-deposition to extend our investigation to another metal of major interest and strengthen our modeling of single metallic ND growth onto II-VI semiconducting nanoparticles. This demonstrated strategy can raise a common methodology in the synthesis of single-tip semiconductor-metal hybrid nanoheterodimers (NHDs), leading to advanced nanoparticles architectures for applications in areas as different as photocatalysis, hydrogen production, photovoltaics, and light detection.
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Affiliation(s)
- Junjie Hao
- CNRS, Univ. Bordeaux, Bordeaux INP, ICMCB, UMR 5026, 87 avenue du Dr. A. Schweitzer, Pessac F-33608, France
- Univ. Bordeaux, CNRS, LOMA, UMR 5798, 33405 Talence, France
| | - Haochen Liu
- Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, China
| | - Kai Wang
- Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, China
| | - Xiao Wei Sun
- Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, China
| | | | - Marie-Helene Delville
- CNRS, Univ. Bordeaux, Bordeaux INP, ICMCB, UMR 5026, 87 avenue du Dr. A. Schweitzer, Pessac F-33608, France
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2
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Aubert R, Kenens B, Chamtouri M, Fujita Y, Fortuni B, Lu G, Hutchison JA, Inose T, Uji-i H. Surface Density-of-States Engineering of Anatase TiO 2 by Small Polyols for Enhanced Visible-Light Photocurrent Generation. ACS OMEGA 2017; 2:6309-6313. [PMID: 29104949 PMCID: PMC5664144 DOI: 10.1021/acsomega.7b00853] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Accepted: 08/16/2017] [Indexed: 06/07/2023]
Abstract
Enhancement of visible-light photocurrent generation by sol-gel anatase TiO2 films was achieved by binding small polyol molecules to the TiO2 surface. Binding ethylene glycol onto the surface, enhancement factors up to 2.8 were found in visible-light photocurrent generation experiments. Density functional theory calculations identified midgap energy states that emerge as a result of the binding of a range of polyols to the TiO2 surface. The presence and energy of the midgap state is predicted to depend sensitively on the structure of the polyol, correlating well with the photocurrent generation results. Together, these results suggest a new, facile, and cost-effective route to precise surface band gap engineering of TiO2 toward visible-light-induced photocatalysis and energy storage.
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Affiliation(s)
- Remko Aubert
- Department
of Chemistry, KU Leuven, Celestijnenlaan 200F, B-3001 Heverlee, Belgium
| | - Bart Kenens
- Department
of Chemistry, KU Leuven, Celestijnenlaan 200F, B-3001 Heverlee, Belgium
| | - Maha Chamtouri
- Department
of Chemistry, KU Leuven, Celestijnenlaan 200F, B-3001 Heverlee, Belgium
| | - Yasuhiko Fujita
- Department
of Chemistry, KU Leuven, Celestijnenlaan 200F, B-3001 Heverlee, Belgium
| | - Beatrice Fortuni
- Department
of Chemistry, KU Leuven, Celestijnenlaan 200F, B-3001 Heverlee, Belgium
| | - Gang Lu
- Department
of Chemistry, KU Leuven, Celestijnenlaan 200F, B-3001 Heverlee, Belgium
- KLOFE,
SICAM, Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, Jiangsu, People’s Republic of China
| | - James A. Hutchison
- Université
de Strasbourg & CNRS UMR 7006, Strasbourg 67000, France
- School
of Chemistry and Bio21 Institute, University
of Melbourne, Parkville, Victoria 3010, Australia
| | - Tomoko Inose
- RIES, Hokkaido University, N20W10, Kita, Sapporo 001-0020, Japan
| | - Hiroshi Uji-i
- Department
of Chemistry, KU Leuven, Celestijnenlaan 200F, B-3001 Heverlee, Belgium
- RIES, Hokkaido University, N20W10, Kita, Sapporo 001-0020, Japan
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3
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Photochemical Preparation of Anatase Titania Supported Gold Catalyst for Ethanol Synthesis from CO2 Hydrogenation. Catal Letters 2017. [DOI: 10.1007/s10562-017-2192-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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4
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Fujita Y, Aubert R, Walke P, Yuan H, Kenens B, Inose T, Steuwe C, Toyouchi S, Fortuni B, Chamtouri M, Janssen KPF, De Feyter S, Roeffaers MBJ, Uji-I H. Highly controllable direct femtosecond laser writing of gold nanostructures on titanium dioxide surfaces. NANOSCALE 2017; 9:13025-13033. [PMID: 28832041 DOI: 10.1039/c7nr04299j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A highly reproducible and controllable deposition procedure for gold nanostructures on a titanium dioxide (TiO2) surface using femtosecond laser light has been demonstrated. This is realized by precisely focusing onto the TiO2 surface in the presence of a pure gold ion solution. The deposition is demonstrated both in dot arrays and line structures. Thanks to the multi-photon excitation, we observe that the deposition area of the nanostructures can be confined to a degree far greater than the diffraction limited focal spot. Finally, we demonstrate that catalytic activity with visible light irradiation is enhanced, proving the applicability of our new deposition technique to the catalytic field.
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Affiliation(s)
- Y Fujita
- Department of Chemistry, Division of Molecular Imaging and Photonics, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium.
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5
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Chamtouri M, Kenens B, Aubert R, Lu G, Inose T, Fujita Y, Masuhara A, Hofkens J, Uji-i H. Facet-Dependent Diol-Induced Density of States of Anatase TiO 2 Crystal Surface. ACS OMEGA 2017; 2:4032-4038. [PMID: 28782054 PMCID: PMC5537687 DOI: 10.1021/acsomega.6b00473] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Accepted: 06/21/2017] [Indexed: 05/13/2023]
Abstract
Owing to their fundamental importance and practical applications, anatase TiO2 crystals with well-defined {001} and {101} facets attracted intensive research interests. In this study, we systematically investigated solvent dependence of the photoreaction of the different coexposed crystal facets during noble metal photodeposition. By examining the deposition position in each solvent, we revealed that solvents play a pivotal role on the facet selectivity. On the basis of density functional theory calculations, the solvent molecules were found to modify both the crystal facet electronic structure and the {001}-{001} heterojunction. These modifications are not only the origin of diverse charge-carrier pathways but are also responsible for carrier accumulation at specific facets that increase their reductive power. These findings are vital for a better understanding of photocatalytic materials and an improved design for the next-generation materials.
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Affiliation(s)
- Maha Chamtouri
- Department
of Chemistry, KU Leuven, Celestijnenlaan 200F, B-3001 Heverlee, Belgium
| | - Bart Kenens
- Department
of Chemistry, KU Leuven, Celestijnenlaan 200F, B-3001 Heverlee, Belgium
| | - Remko Aubert
- Department
of Chemistry, KU Leuven, Celestijnenlaan 200F, B-3001 Heverlee, Belgium
| | - Gang Lu
- Department
of Chemistry, KU Leuven, Celestijnenlaan 200F, B-3001 Heverlee, Belgium
- Nanjing
Tech University, KLOFE, SICAM, 30 South Puzhu Road, Nanjing 211816, Jiangsu, People’s Republic of China
| | - Tomoko Inose
- RIES, Hokkaido University, N20W10, Kita-Ward Sapporo 001-0020, Japan
| | - Yasuhiko Fujita
- Department
of Chemistry, KU Leuven, Celestijnenlaan 200F, B-3001 Heverlee, Belgium
| | - Akito Masuhara
- Graduate
School of Science and Engineering, Yamagata
University, 4-13-16, Jonan, Yonezawa 992-8510, Japan
| | - Johan Hofkens
- Department
of Chemistry, KU Leuven, Celestijnenlaan 200F, B-3001 Heverlee, Belgium
- RIES, Hokkaido University, N20W10, Kita-Ward Sapporo 001-0020, Japan
| | - Hiroshi Uji-i
- Department
of Chemistry, KU Leuven, Celestijnenlaan 200F, B-3001 Heverlee, Belgium
- RIES, Hokkaido University, N20W10, Kita-Ward Sapporo 001-0020, Japan
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6
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Hu J, Cao Y, Wang K, Jia D. Green solid-state synthesis and photocatalytic hydrogen production activity of anatase TiO2 nanoplates with super heat-stability. RSC Adv 2017. [DOI: 10.1039/c6ra27160j] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Anatase TiO2 nanoplates with super heat-stability were synthesized via a simple method and used in photocatalytic H2-production.
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Affiliation(s)
- Jindou Hu
- Key Laboratory of Energy Materials Chemistry
- Ministry of Education
- Key Laboratory of Advanced Functional Materials
- Institute of Applied Chemistry
- Xinjiang University
| | - Yali Cao
- Key Laboratory of Energy Materials Chemistry
- Ministry of Education
- Key Laboratory of Advanced Functional Materials
- Institute of Applied Chemistry
- Xinjiang University
| | - Kun Wang
- Key Laboratory of Energy Materials Chemistry
- Ministry of Education
- Key Laboratory of Advanced Functional Materials
- Institute of Applied Chemistry
- Xinjiang University
| | - Dianzeng Jia
- Key Laboratory of Energy Materials Chemistry
- Ministry of Education
- Key Laboratory of Advanced Functional Materials
- Institute of Applied Chemistry
- Xinjiang University
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7
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Shang M, Hou H, Gao F, Wang L, Yang W. Mesoporous Ag@TiO2 nanofibers and their photocatalytic activity for hydrogen evolution. RSC Adv 2017. [DOI: 10.1039/c7ra03177g] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We reported the exploration of Ag@TiO2 mesoporous nanofibers with significantly improved photocatalytic performance.
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Affiliation(s)
- Minghui Shang
- Institute of Materials
- Ningbo University of Technology
- Ningbo City
- P. R. China
| | - Huilin Hou
- Institute of Materials
- Ningbo University of Technology
- Ningbo City
- P. R. China
| | - Fengmei Gao
- Institute of Materials
- Ningbo University of Technology
- Ningbo City
- P. R. China
| | - Lin Wang
- Institute of Materials
- Ningbo University of Technology
- Ningbo City
- P. R. China
| | - Weiyou Yang
- Institute of Materials
- Ningbo University of Technology
- Ningbo City
- P. R. China
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