NDLI: Gold nanoparticles-sensitized wide and narrow band gap TiO<sub>2</sub> for visible light applications: a comparative study

Content Provider	Royal Society of Chemistry (RSC)
Author	Ansari, Sajid Ali Ansari, Omaish Cho, Moo Hwan Khan, Mohammad Mansoob
Copyright Year	2015
Abstract	Gold nanoparticles (AuNPs)-sensitized wide band gap TiO2 (Au/P-TiO2) and narrow band gap TiO2 (Au/M-TiO2) nanocomposites were prepared using an electrochemically active biofilm. The optical and structural properties of the Au/P-TiO2 and Au/M-TiO2 nanocomposites were characterized using standard techniques. The surface plasmon resonance (SPR) absorption characteristics of the AuNPs on the TiO2 surface extended the absorption edge of P-TiO2 and M-TiO2 to the visible light region. The photocatalytic activity of the Au/P-TiO2 and Au/M-TiO2 nanocomposites was evaluated by the photodegradation of methylene blue and methyl orange, and 2-chlorophenol under visible light irradiation, where Au/M-TiO2 nanocomposite exhibited enhanced photocatalytic activity compared to the Au/P-TiO2 nanocomposite and P-TiO2 and M-TiO2 nanoparticles. Furthermore, the higher photoelectrochemical performance of the Au/M-TiO2 nanocomposite compared to the Au/P-TiO2 nanocomposite and P-TiO2 and M-TiO2 nanoparticles further support its higher visible light active behavior under visible light irradiation. The pronounced photoactivities of the Au/M-TiO2 nanocomposite in the visible region were attributed to the interfacial synergistic effects of the two phenomena, i.e. the SPR effect of AuNPs and the defect-induced band gap reduction of M-TiO2 nanoparticles. The present work provides a newer insight into the development of nanocomposites of noble metals and defective metal oxides with high efficiency in the field of visible light-induced photoactivity.
Starting Page	4708
Ending Page	4715
Page Count	8
File Format	HTM / HTML PDF
ISSN	11440546
Volume Number	39
Issue Number	6
Journal	New Journal of Chemistry
DOI	10.1039/c5nj00556f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Photodegradation 2-Chlorophenol Biofilm Photoelectrochemical process Surface plasmon resonance Nanocomposite Band gap Gap reduction Surface plasmon Methyl orange Methylene blue
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry Catalysis

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