Plasmon-Sensitized Optoelectronic Properties of Au Nanoparticle-Assisted Vertically Aligned TiO<sub>2</sub> Nanowires by GLAD Technique

Shougaijam, Biraj; Ngangbam, Chitralekha; Lenka, Trupti Ranjan

doi:10.1109/ted.2017.2648500

Cited by 19 publications

(4 citation statements)

References 31 publications

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“…The porous nature observed from the top view reveals the formation TAT-NWs. Similar morphology is observed from the top view image of GLAD deposited TiO2 NWs [24]. Such nanostructure enhanced the photon absorption due to an increase in the surface-to-volume ratio.…”

Section: Fe-sem Analysissupporting

confidence: 77%

Structural and Optical Analysis of Ag Nanoparticles assisted Vertically Aligned TiO2 Nanowires based photoanode for Dye-sensitized Solar Cells Application

Shougaijam

Singh

2021

Preprint

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In this work, vertically aligned TiO 2 -Nanowires (TiO 2 -NWs) and Ag Nanoparticles assisted TiO 2 Nanowires (TAT-NWs) were deposited on glass and flexible PET substrates using the Glancing Angle Deposition (GLAD) technique. The morphology and structural analysis of the samples manifest the successful deposition of vertically aligned TiO 2 -NWs and TAT-NWs. The HR-TEM image of TiO 2 -NWs shows the polycrystalline nature. Further, the XRD result confirms the polycrystalline nature of both the TiO 2 -NWs and TAT-NWs samples. Besides, the HR-TEM image confirms the presence of small crystal grains of Ag Nanoparticles (Ag-NPs) at the mid of the annealed TAT-NWs. It is evident from the Selective Area Electron Diffraction (SAED) analysis of the TiO 2 -NWs and annealed TAT-NWs that the crystallinity of TiO 2 present in the annealed TAT-NWs improves after annealing. The absorption spectrum analysis of TAT-NWs deposited on glass substrate shows enhance absorption peak in the visible region with a maximum peak at ~463 nm wavelength compare to the TiO 2 -NWs, which may be attributed to the Surface Plasmon Resonance (SPR) effect of Ag-NPs. Further, it is interesting to observe that the TAT-NWs deposited on PET substrate show further absorption enhancement in the UV and visible region. In addition, the Photoluminescence analysis reveals that the bandgap of the TiO 2 -NWs is ~3.12 eV, which supports the bandgap extracted from the Tauc plot. Therefore, the proposed method of fabricating TAT-NWs on glass and flexible ITO coated PET substrate using the GLAD technique may be applicable for developing novel photoanode for Dye-sensitized Solar Cells (DSSCs) and other optoelectronic applications.

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Section: Fe-sem Analysissupporting

confidence: 77%

Structural and Optical Analysis of Ag Nanoparticles assisted Vertically Aligned TiO2 Nanowires based photoanode for Dye-sensitized Solar Cells Application

Shougaijam

Singh

2021

Preprint

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“…The junction formed between the Ag NPs and the semiconductor can assist the separation of photogenerated charge carriers along with efficient charge carrier transfer mechanism that can further result in increased photocurrents and superior performance of photoelectronic devices. Till now, numerous metal oxide-based nanostructures using TiO 2 , ZnO and SiO 2 have already been synthesized with noble metal NPs for photodetector applications [27][28][29]. In spite of these, so far, the use of Ag NPs on 1D CeO 2 nanostructures has not been reported for photodetector application.…”

Section: Introductionmentioning

confidence: 99%

Plasmon-induced Ag decorated CeO₂ nanorod array for photodetector application

Devi

Singh

2020

Nanotechnology

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In this work, glancing angle deposition (GLAD) has been used to grow Ag decorated CeO2 nanorod (NR) array on n-type Si substrate. The length of the NRs obtained was ∼235 nm and the size of the Ag NPs varied from 13 to 41 nm. The polycrystalline and crystalline nature of CeO2 and Ag respectively was revealed via selected area electron diffraction (SAED) analysis as well as x-ray diffraction (XRD) pattern. Optical absorption measurement depicts a distinct broad peak around 413 nm that is ascribed to the localized surface plasmon resonance (LSPR) effect of Ag NPs. The Ag decorated CeO2 NR device exhibited a turn on voltage at ∼3.2 V under dark, which then reduced to ∼1.3 V under 35 min illumination along with the increase in device current from 2.8 to 24.5 μA cm−2 (4 V) on continuous exposure to light. Under white light illumination, a responsivity of 4.51 A W−1 was obtained at 370 nm along with the detectivity and noise equivalent power (NEP) values of 4.15 × 1012 jones and 0.01 pW respectively. Additionally, a fast response characteristic with rise and fall times of 74 ms and 42 ms respectively was demonstrated. Thus, these findings manifest the underlying LSPR mechanism at work in Ag/CeO2 heterojunction and reveal its high potential in UV photodetector application.

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“…Obviously, after the plasma treatment process, a decrease of the bandgap can be found, which could be attributed to the deep-level defects (oxygen vacancies) induced by the plasma treatment. [25] When the materials were used as catalysts for NRR reaction, the improved performances are related to the formed oxygen vacancies (or Ti 3þ species) and disordered surface layer in the hydrogenated TiO 2 . The high-resolution transmission electron microscopy (HRTEM) images of the three samples are shown in Figure 2.…”

Section: Characterizations and Discussionmentioning

confidence: 99%

Hydrogenated TiO₂ Nanoparticles Loaded with Au Nanoclusters Demonstrating Largely Enhanced Performance for Electrochemical Reduction of Nitrogen to Ammonia

et al. 2022

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Pristine TiO2/Au (P‐TiO2/Au) is modified by hydrogen plasma (H‐TiO2/Au) or hydrogen and oxygen plasma (H‐O‐TiO2/Au) treatment, and then used as electrochemical catalysts for nitrogen reduction reaction (NRR). H‐TiO2/Au shows enhanced performance for the NRR process compared with both P‐TiO2/Au and H‐O‐TiO2/Au. After hydrogenation treatment, some disordered regions on the surface of TiO2 nanoparticles are formed, and a large number of oxygen vacancies are incorporated into the TiO2 crystalline structures. When the samples are used as catalysts for electrochemical NRR, the yield of NH3 of H‐TiO2/Au is about ten times compared to that of P‐TiO2/Au and about three times that of H‐O‐TiO2/Au, while the highest Faradaic efficiency of 2.7% is also obtained at the potential of −0.1 V for the H‐TiO2/Au catalyst. The density functional theory (DFT) calculation results confirm that H‐TiO2/Au with oxygen vacancies and the disordered surface layer is much preferred energetically for the NRR process. It proves that enhanced adsorption of N2 molecules on the catalyst and reduced reaction barriers due to the presence of defects play an important role in improving catalysts’ performances. The results show that the plasma hydrogenation technique can be used as an efficient method to modify catalysts for electrochemical NRR processes.

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Plasmon-Sensitized Optoelectronic Properties of Au Nanoparticle-Assisted Vertically Aligned TiO₂ Nanowires by GLAD Technique

Cited by 19 publications

References 31 publications

Structural and Optical Analysis of Ag Nanoparticles assisted Vertically Aligned TiO2 Nanowires based photoanode for Dye-sensitized Solar Cells Application

Structural and Optical Analysis of Ag Nanoparticles assisted Vertically Aligned TiO2 Nanowires based photoanode for Dye-sensitized Solar Cells Application

Plasmon-induced Ag decorated CeO₂ nanorod array for photodetector application

Hydrogenated TiO₂ Nanoparticles Loaded with Au Nanoclusters Demonstrating Largely Enhanced Performance for Electrochemical Reduction of Nitrogen to Ammonia

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Plasmon-Sensitized Optoelectronic Properties of Au Nanoparticle-Assisted Vertically Aligned TiO2 Nanowires by GLAD Technique

Cited by 19 publications

References 31 publications

Structural and Optical Analysis of Ag Nanoparticles assisted Vertically Aligned TiO2 Nanowires based photoanode for Dye-sensitized Solar Cells Application

Structural and Optical Analysis of Ag Nanoparticles assisted Vertically Aligned TiO2 Nanowires based photoanode for Dye-sensitized Solar Cells Application

Plasmon-induced Ag decorated CeO2 nanorod array for photodetector application

Hydrogenated TiO2 Nanoparticles Loaded with Au Nanoclusters Demonstrating Largely Enhanced Performance for Electrochemical Reduction of Nitrogen to Ammonia

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Product

Resources

About

Plasmon-Sensitized Optoelectronic Properties of Au Nanoparticle-Assisted Vertically Aligned TiO₂ Nanowires by GLAD Technique

Plasmon-induced Ag decorated CeO₂ nanorod array for photodetector application

Hydrogenated TiO₂ Nanoparticles Loaded with Au Nanoclusters Demonstrating Largely Enhanced Performance for Electrochemical Reduction of Nitrogen to Ammonia