Atom beam sputtered Ag-TiO 2  plasmonic nanocomposite thin films for photocatalytic applications

Singh, Jaspal; Sahu, Kavita; Pandey, Akhilesh; Kumar, Mohit; Ghosh, Tapas; Satpati, Biswarup; Som, T.; Varma, Shikha; Avasthi, D.K.; Mohapatra, Satyabrata

doi:10.1016/j.apsusc.2017.03.152

Cited by 84 publications

(19 citation statements)

References 47 publications

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“…Compared with TiO 2 film, a broad and strong absorption was exhibited from 200 to 400 nm, which was contributed to the characteristic absorption peak of H 3 PW 12 O 40 ; meanwhile a significant redshift of TiO 2 /H 3 PW 12 O 40 film was observed, which was derived from the generation of narrow band gap through the hybridization of Ti 3d and W 5d orbit in TiO 2 /H 3 PW 12 O 40 film 12 . It is worth noting that owing to SPR effect of metallic Ag 49 , both Ag-TiO 2 and Ag-TiO 2 /H 3 PW 12 O 40 composite film showed a light response in visible-light region (400–500 nm), which was superior to other modification methods 50 , 51 . Overall, the introduction of Ag extended the light response region and increased the light harvesting efficiency.…”

Section: Resultsmentioning

confidence: 95%

Design of plasmonic Ag-TiO2/H3PW12O40 composite film with enhanced sunlight photocatalytic activity towards o-chlorophenol degradation

Lü

Wang

Ning

et al. 2017

Sci Rep

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A series of plasmonic Ag-TiO2/H3PW12O40 composite films were fabricated and immobilized by validated preparation technique. The chemical composition and phase, optical, SPR effect and pore-structure properties together with the morphology of as-prepared composite film are well-characterized. The multi-synergies of as-prepared composite films were gained by combined action of electron-capture action via H3PW12O40, visible-response induced by Ag, and Schottky-junction formed between TiO2-Ag. Under simulated sunlight, the maximal K app of o-chlorophenol (o-CP) reached 0.0075 min−1 which was 3.95-fold larger than that of TiO2 film, while it was restrained obviously under acid condition. In the photocatalytic degradation process, ·OH and ·O2 − attacked preferentially ortho and para position of o-CP molecule, and accordingly the specific degradation pathways were speculated. The novel composite film exhibited an excellent applicability due to self-regeneration of H3PW12O40, well-protection of metal Ag° and favorable immobilization.

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Section: Resultsmentioning

confidence: 95%

Design of plasmonic Ag-TiO2/H3PW12O40 composite film with enhanced sunlight photocatalytic activity towards o-chlorophenol degradation

Lü

Wang

Ning

et al. 2017

Sci Rep

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“…The excited electrons from Ag could transfer to CB of ZnO. These additional electrons from Ag increased the number of • O 2 − -free radicals (Singh et al , 2017). These • O 2 − -free radicals were the dominant reactive species in degrading RhB molecules, thus in agreement with the finding from scavenger test.…”

Section: Resultsmentioning

confidence: 99%

Reusability of metals/metal oxide coupled zinc oxide nanorods in degradation of rhodamine B dye

Pung

2020

PRT

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Purpose This paper aims to investigate the reusability of metal/metal oxide-coupled ZnO nanorods (ZnO NRs) to degrade rhodamine B (RhB). Design/methodology/approach ZnO NRs particles were synthesized by precipitation method and used to remove various types of metal ions such as Cu2+, Ag+, Mn2+, Ni2+, Pb2+, Cd2+ and Cr2+ ions under UV illumination. The metal/metal oxide-coupled ZnO NRs were characterized by scanning electron microscope, X-ray diffraction and UV-Vis diffuse reflectance. The photodegradation of RhB dye by these metal/metal oxide-coupled ZnO NRs under UV exposure was assessed. Findings The metal/metal oxide-coupled ZnO NRs were successfully reused to remove RhB dye in which more than >90% of RhB dye was degraded under UV exposure. Furthermore, the coupling of Ag, CuO, MnO2, Cd and Ni particles onto the surface of ZnO NRs even enhanced the degradation of dye. The dominant reactive species involved in the degradation of RhB dye were •OH- and •O2−-free radicals. Research limitations/implications The coupling of metal/metal oxide onto the surface of ZnO NRs after metal ions removal could affect the photocatalytic performance of ZnO NRs in the degradation of organic pollutants in subsequent stage. Practical implications A good reusability performance of metal/metal oxide-coupled ZnO NRs make ZnO NRs become a desirable photocatalyst material for the treatment of wastewater, which consists of both heavy metal ions and organic dyes. Originality/value Metal/metal oxide coupling onto the surface of ZnO NRs particles improved subsequent UV-assisted photocatalytic degradation of RhB dye.

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“…The action mechanism of the catalysts based on TiO 2 NPs and noble metal nanoparticles under visible light can be described as follows: after absorption of photon energy, the free electrons of Ag/Au NPs are excited to a higher Fermi level, and then they are transferred from the noble metal to TiO 2 ‐N + NPs, phenomenon which leads to the formation of a Schottky junction. The Schottky junction allows electron movement towards the TiO 2 through the LSPR decay effect leaving behind positively charged holes in the valence band and also inhibits the recombination of photogenerated electron‐hole pairs ,. The charge carriers from the surface interact with the adsorbed molecules: the holes react with H 2 O producing hydroxyl radical (•OH) and the electrons from TiO 2 ‐N + NPs conduction band react with oxygen molecules generating highly reactive oxygen radical species (•O 2− ) .…”

Section: Resultsmentioning

confidence: 99%

TiO₂‐Based Photopolymerized Hybrid Catalysts with Visible Light Catalytic Activity Induced by In Situ Generated Ag/Au NPs

Melinte¹,

Buruiană²,

Roșca³

et al. 2019

ChemistrySelect

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This work describes the use of surface modified TiO 2 nanoparticles in combination with photopolymerizable monomers in the achieving of hybrid photocrosslinked polymer networks for photocatalysis. The surface of TiO 2 nanoparticles was functionalized by means of a silane coupling agent with acrylic sequences and quaternary ammonium units in order to attain a covalent linkage of the nanoparticles inside the photocured matrix. To increase the photocatalytic performance of TiO 2 NPs and to expand its catalytic activity under visible light, Ag/Au NPs were in situ photogenerated in the acrylic matrix simulta-neously with the photopolymerization process. The photopolymerization profile, diffraction patterns and nanoparticles distribution were established for the hybrid films by FTIR, XRD and TEM, respectively. Additionally, the hybrid films exhibited good antibacterial properties against Staphylococcus aureus and Escherichia coli.

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Atom beam sputtered Ag-TiO 2 plasmonic nanocomposite thin films for photocatalytic applications

Cited by 84 publications

References 47 publications

Design of plasmonic Ag-TiO2/H3PW12O40 composite film with enhanced sunlight photocatalytic activity towards o-chlorophenol degradation

Design of plasmonic Ag-TiO2/H3PW12O40 composite film with enhanced sunlight photocatalytic activity towards o-chlorophenol degradation

Reusability of metals/metal oxide coupled zinc oxide nanorods in degradation of rhodamine B dye

TiO₂‐Based Photopolymerized Hybrid Catalysts with Visible Light Catalytic Activity Induced by In Situ Generated Ag/Au NPs

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Atom beam sputtered Ag-TiO 2 plasmonic nanocomposite thin films for photocatalytic applications

Cited by 84 publications

References 47 publications

Design of plasmonic Ag-TiO2/H3PW12O40 composite film with enhanced sunlight photocatalytic activity towards o-chlorophenol degradation

Design of plasmonic Ag-TiO2/H3PW12O40 composite film with enhanced sunlight photocatalytic activity towards o-chlorophenol degradation

Reusability of metals/metal oxide coupled zinc oxide nanorods in degradation of rhodamine B dye

TiO2‐Based Photopolymerized Hybrid Catalysts with Visible Light Catalytic Activity Induced by In Situ Generated Ag/Au NPs

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TiO₂‐Based Photopolymerized Hybrid Catalysts with Visible Light Catalytic Activity Induced by In Situ Generated Ag/Au NPs