Effect of nanotube diameter on the photocatalytic activity of bimetallic AgAu nanoparticles grafted 1D-TiO2 nanotubes

Bamola, Priyanka; Rawat, Saurabh; Dwivedi, Charu; Sharma, Mohit; Singh, Bharti; Sharma, Himani

doi:10.1007/s10854-020-04914-2

Cited by 7 publications

(5 citation statements)

References 45 publications

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“…In the TONTs structure, the O1s XPS spectra has two different peaks at binding energies of 528.5 eV and 530.6 eV. The peak at 528.5 eV is due to lattice oxygen, while the peak at 530.6 eV is due to non-lattice oxygen [8]. The O1s spectra is found for both the CVD and hydrothermal heterostructures.…”

Section: Oxygen (O)mentioning

confidence: 98%

“…Several initiatives have been devoted to fabricating diverse morphologies of TiO 2 , such as nanospheres, hierarchy spheres, nanowires, nanotubes, and porous networks, in order to boost photocatalytic activity [7]. The quick recombination of photoinduced electronhole pairs and TiO 2 's high band gap (3.2 eV), restrict visible light consumption and photocatalytic activity [8]. Realistic designs of TiO 2 -based heterostructure photocatalysts comprising appropriate architectural structures/morphology were implemented to alleviate these disadvantages [9].…”

Section: Introductionmentioning

confidence: 99%

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Enhanced interfacial charge transfer on strain-induced 2D-1D/MoS₂-TiO₂ heterostructures for electrochemical and photocatalytic applications

Bamola¹,

Rawat²,

Tanwar³

et al. 2022

Nanotechnology

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2D/1D-MoS2/TiO2 heterostructures have proven to be vigorous for photocatalytic applications. The enhancement in photocatalytic activity of heterostructures may get influenced by the accumulation of strain at the interface that affects the interfacial interaction. Keeping that in view, present paper reports the strain accumulated interfacial modification of 2D/1D-MoS2/TiO2 heterostructures for the enhancement of photocatalytic activity. Two different synthesis methods such as hydrothermal and chemical vapour deposition (CVD) method are used for the growth of MoS2 on TiO2 nanostructures. Micro-Raman spectroscopy revealed that strain is accumulated at the interface on growth of MoS2 over TiO2 nanostructures. It is further revealed that the MoS2/TiO2 heterostructure synthesized by CVD method induces compressive strain. Also, heterostructures synthesize by hydrothermal method induces tensile strain that modify the charge separation at the interface, which was further confirmed by X-ray photoelectron spectroscopy (XPS). Moreover, ultraviolet photoelectron spectroscopy (UPS) revealed that the upward band bending in the MoS2/TiO2 heterostructures synthesized by hydrothermal method. Similarly, heterostructure synthesized by chemical vapour method (CVD) shows the downward band bending that leads to the improved charge separation at interface. The modified interface of heterostructures is further studied for electrochemical measurement using cyclic voltammetry (CV) and photocatalytic activity by degradation of model compound.

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Section: Oxygen (O)mentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Enhanced interfacial charge transfer on strain-induced 2D-1D/MoS₂-TiO₂ heterostructures for electrochemical and photocatalytic applications

Bamola¹,

Rawat²,

Tanwar³

et al. 2022

Nanotechnology

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“…Using ultraviolet photoelectron spectroscopy (UPS), we were able to get more information about the work functions of the Au NPs and MoS 2 interface. Using the following expression, we were able to determine the work function value [33]…”

Section: Structural Characterizationsmentioning

confidence: 99%

Interdigitated electrodes-based Au-MoS₂ hybrid gas sensor for sensing toxic CO and NH₃ gases at room temperature

et al. 2023

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In the quest to create effective sensors that operate at room temperature, consume less power and maintain their stability over time for detecting toxic gases in the environment, molybdenum disulfide (MoS2) and MoS2-based hybrids have emerged as potent materials. In this context, the current work describes the fabrication of Au-MoS2 hybrid gas sensor fabricated on gold interdigitated electrodes (GIEs) for sensing harmful CO and NH3 gases at room temperature. The GIEs-based Au-MoS2 hybrid sensors are fabricated by decorating MoS2 nanoflowers (MNF) with varying size of Au nanoparticles using an inert gas evaporation technique. It is observed that by varying the size of Au nanoparticles, the crystallinity gets modified, as confirmed by X-ray diffraction (XRD) and Micro-Raman spectroscopy (μRS). The gas sensing measurements revealed that the best sensing response is found from the Au-MoS2 hybrid (with an average particle size of 10 nm). This particular hybrid shows a 79% response to CO exposure and a 69% response to NH3 exposure. The measurements are about 3.5 and 5 times higher than the bare MoS2 when exposed to CO and NH3 at room temperature, respectively. This enhancement in sensing response is attributed to the modified interfacial interaction between the Au nanoparticles and MNF gets improved, which leads to the formation of a Schottky barrier, as confirmed using X-ray photoelectron spectroscopy (XPS) and Ultraviolet photoelectron spectroscopy (UPS) analysis. This enables the development of efficient gas sensors that respond quickly to changes in the gas around them.

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“…It may further be explained on the basis of photogenerated hole trapping in the ZnPd BiMeNPs. The saturated d-band in ZnPd underneath the Fermi level can afford an excess of electrons for inter-band transitions in visible light [9]. Due to the existence of an electric field at the ZnPd-TiO 2 interface, all d-band electrons of ZnPd BiMeNPs are stimulated to the conduction band (CB) and transported to the TiO 2 side.…”

Section: Electrochemical and Photocatalytic Studies Of Tio 2 Nr Menps...mentioning

confidence: 99%

“…Latterly, the incentive of research is more engrossed to development in catalytic applications through crafting of metal nanoparticles (MeNPs) and bimetallic nanoparticles (BiMeNPs) over TiO 2 nanostructures (TiNs) to form hybrids [8][9][10][11][12][13]. MeNPs and BiMeNPs provide active surface sites for photocatalytic process.…”

Section: Introductionmentioning

confidence: 99%

Photoinduced charge separation at Zn-Pd/TiO₂ hybrids interface for enhanced electrochemical and photocatalytic activity

Bamola¹,

Rawat²,

Pathak³

et al. 2022

J. Phys. D: Appl. Phys.

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One dimensional nanostructures based hybrids have proven to be potent for photocatalytic applications. The hybrids having modified interface play a vigorous role in enrichment of photocatalytic activity by electronic interaction. Electronic interaction at interface occurs by the formation of electronic barriers (Ohmic/Schottky) that affects the transport of charge carriers and hence photocatalytic activity. The present work reports the switching of role play between Ohmic and Schottky barriers using different hybrids in order to have enhancement in photocatalytic activity. In order to form hybrids, MeNPs (Pd and Zn) and BiMeNPs (ZnPd) are chosen to study the modification of interface by XPS and UPS. The analysis revealed that Pd and ZnPd crafted TiO2 nanorods (TiO2 NR) shows the formation of Schottky barrier with upward band bending at interface. Similarly, Zn crafted TiO2 NR shows the Ohmic barrier with downward band bending at interface. The band bending in hybrids is accredited to interfacial electronic interaction and charge separation at interface. The modified hybrids are studied for electrochemical analysis using cyclic voltammetry. It is analyzed that higher electrical conductivity is present in ZnPd/TiO2 NR, facilitates the transport of charge carriers. The improved charge separation at interface of ZnPd/ TiO2 NR leads to enhanced photocatalytic activity in comparison to Pd/TiO2 NR and Zn/TiO2 NR.

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Effect of nanotube diameter on the photocatalytic activity of bimetallic AgAu nanoparticles grafted 1D-TiO2 nanotubes

Cited by 7 publications

References 45 publications

Enhanced interfacial charge transfer on strain-induced 2D-1D/MoS₂-TiO₂ heterostructures for electrochemical and photocatalytic applications

Enhanced interfacial charge transfer on strain-induced 2D-1D/MoS₂-TiO₂ heterostructures for electrochemical and photocatalytic applications

Interdigitated electrodes-based Au-MoS₂ hybrid gas sensor for sensing toxic CO and NH₃ gases at room temperature

Photoinduced charge separation at Zn-Pd/TiO₂ hybrids interface for enhanced electrochemical and photocatalytic activity

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Effect of nanotube diameter on the photocatalytic activity of bimetallic AgAu nanoparticles grafted 1D-TiO2 nanotubes

Cited by 7 publications

References 45 publications

Enhanced interfacial charge transfer on strain-induced 2D-1D/MoS2-TiO2 heterostructures for electrochemical and photocatalytic applications

Enhanced interfacial charge transfer on strain-induced 2D-1D/MoS2-TiO2 heterostructures for electrochemical and photocatalytic applications

Interdigitated electrodes-based Au-MoS2 hybrid gas sensor for sensing toxic CO and NH3 gases at room temperature

Photoinduced charge separation at Zn-Pd/TiO2 hybrids interface for enhanced electrochemical and photocatalytic activity

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Product

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Enhanced interfacial charge transfer on strain-induced 2D-1D/MoS₂-TiO₂ heterostructures for electrochemical and photocatalytic applications

Enhanced interfacial charge transfer on strain-induced 2D-1D/MoS₂-TiO₂ heterostructures for electrochemical and photocatalytic applications

Interdigitated electrodes-based Au-MoS₂ hybrid gas sensor for sensing toxic CO and NH₃ gases at room temperature

Photoinduced charge separation at Zn-Pd/TiO₂ hybrids interface for enhanced electrochemical and photocatalytic activity