Pyridyl anchoring squaraine as a near-infrared dye sensitizer for effective sensitized hydrogen production over a titanium dioxide photocatalyst in water medium

Squaraine dyes are organic dyes having strong and narrow absorption properties in the near-infrared region that are widely used in photovoltaic and biomedical applications. In this work, squaraine dye ( SA1 ) was synthesized as a dye sensitizer for a dye-sensitized photocatalytic system, which was c...

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Bibliographic Details
Published in:Applied physics. A, Materials science & processing Materials science & processing, 2023-01, Vol.129 (1), Article 28
Main Authors: Shen, Xiao-Feng, Watanabe, Motonori, Takagaki, Atsushi, Song, Jun Tae, Abe, Tatsuki, Kawaguchi, Daisuke, Tanaka, Keiji, Ishihara, Tatsumi
Format: Article
Language:English
Subjects:
50th Anniversary of Applied Physics
Absorption spectroscopy
Applied physics
Biomedical materials
Catalytic activity
Characterization and Evaluation of Materials
Condensed Matter Physics
Decomposition
Decomposition reactions
Dyes
Hydrogen production
Ions
Light irradiation
Machines
Manufacturing
Mass spectrometry
Materials science
Nanotechnology
Near infrared radiation
NMR spectroscopy
Optical and Electronic Materials
Photocatalysis
Photocatalysts
Photodecomposition
Photodissociation
Physics
Physics and Astronomy
Processes
S.i. : 50th Anniversary of Applied Physics
Surfaces and Interfaces
Thin Films
Titanium dioxide
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Summary:Squaraine dyes are organic dyes having strong and narrow absorption properties in the near-infrared region that are widely used in photovoltaic and biomedical applications. In this work, squaraine dye ( SA1 ) was synthesized as a dye sensitizer for a dye-sensitized photocatalytic system, which was composed of SA1 and Pt-loaded TiO 2 powder photocatalyst ( SA1 /Pt-TiO 2 ). The SA1 /Pt-TiO 2 system exhibited a good hydrogen production performance within 150 h and an apparent quantum yield of 1.4% under 800 nm monochromatic light irradiation. However, during the photocatalytic reaction, the photocatalytic activity of SA1 /Pt-TiO 2 decreased due to photodecomposition. Ultraviolet–visible absorption spectroscopy, 1 H nuclear magnetic resonance spectroscopy, and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry measurements were performed to investigate the mechanism of the decomposition of the squaraine moiety of SA1 , the decomposition process, and the structure of the decomposed material. The results show that even without the Pt-loaded TiO 2 powder photocatalyst, SA1 undergoes photodissociation, which cleaves the bond between the indoline moiety and the square acid. Graphical abstract
ISSN:0947-8396
1432-0630
DOI:10.1007/s00339-022-06281-7