Absorption spectra and photocurrent densities of Ag nanoparticle/TiO2 composite thin films with various amounts of Ag

Likius, Daniel; Nagai, Hiroki; Sato, Mitsunobu

doi:10.1007/s10853-013-7533-0

Cited by 23 publications

(45 citation statements)

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“…The XRD and electrical conductivity results of these Ag-NP/TiO 2 composite thin films are presented in our recent paper [32,33]. Figure 1 shows the XPS high resolution wide scans for COMP-Ag70.…”

Section: Resultsmentioning

confidence: 99%

“…Using molecular precursor method (MPM), a coating precursor solution can be prepared by a reaction of Ti(O i Pr) 4 with ethylenediamine-N,N,N′,N'-tetraacetic acid (EDTA) under the presence of dibutylamine and hydrogen peroxide [30][31][32]. Consecutively, the Ag acetate ethanol solution can be easily prepared, simply by dissolving the silver salt in ethanol [32,33]. The two precursor solutions can be then mixed at different molar concentration to form a composite solution [32,33].…”

Section: Introductionmentioning

confidence: 99%

“…Consecutively, the Ag acetate ethanol solution can be easily prepared, simply by dissolving the silver salt in ethanol [32,33]. The two precursor solutions can be then mixed at different molar concentration to form a composite solution [32,33]. By spin coating the composite precursor solution on quartz glass substrates, the potential of producing metallic Ag-nanoparticles/titania (Ag NP/TiO 2 ) composite thin films with various and unprecedentedly high Ag particles, up to 80 mol% of Ag homogeneously distributed in a titania matrix can be fabricated by heat treated at 600 °C [32,33].…”

Section: Introductionmentioning

confidence: 99%

“…The two precursor solutions can be then mixed at different molar concentration to form a composite solution [32,33]. By spin coating the composite precursor solution on quartz glass substrates, the potential of producing metallic Ag-nanoparticles/titania (Ag NP/TiO 2 ) composite thin films with various and unprecedentedly high Ag particles, up to 80 mol% of Ag homogeneously distributed in a titania matrix can be fabricated by heat treated at 600 °C [32,33]. It was concluded that the MPM offers excellent miscibility of the silver and titania precursor solutions, and is effective for overcoming the limitations in miscibility of the conventional sol-gel method and is necessary for fabricating Ag/TiO 2 composite thin films with amounts of Ag ≤ 80 mol% [32].…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic Activity of Vis-Responsive Ag-Nanoparticles/TiO2 Composite Thin Films Fabricated by Molecular Precursor Method (MPM)

et al. 2013

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Abstract:The Ag-nanoparticles (Ag-NP)/TiO 2 composite thin films with various amounts of Ag (10 mol% ≤ n ≤ 80 mol%) were examined as a potential photocatalyst by decoloration reaction of methylene blue (MB) in an aqueous solution. These composite thin films of ca. 100 nm thickness were fabricated by the MPM at 600 °C in air. The decoloration rates monitored by the absorption intensity of the MB solution indicated that the composite thin films of Ag with an amount less than 40 mol% are not effective under vis-irradiation, though they can work as a photocatalyst under UV-irradiation. Further, the UV-sensitivity of the composite thin films gradually decreased to almost half the level of that of the TiO 2 thin film fabricated under the identical conditions when the Ag amount increased from 10 to 40 mol%. Contrarily, the composite thin films of Ag content larger than 50 mol% showed the vis-responsive activity, whose level was slightly lower than the decreased UV-sensitivity. Diffuse reflectance spectra suggested that the vis-responsive OPEN ACCESSCatalysts 2013, 3 626 activity of the composite thin films is due to the conductivity, localized surface plasmon resonance and surface plasmon resonance of Ag-NP. It was also elucidated that the vis-responsive level of the composite thin films corresponds to their electrical conductivity that depends on the Ag content.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photocatalytic Activity of Vis-Responsive Ag-Nanoparticles/TiO2 Composite Thin Films Fabricated by Molecular Precursor Method (MPM)

et al. 2013

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“…The results indicate that the TiO 2 thin film is an insulator in the dark and acts as an n-type semiconductor under 1-sun light irradiation based on the anodic photocurrent density observed, as we reported previously. 12 Thus, it can be assumed that the photovoltaic charging of the LIB requires the active materials on the anodic electrode to function as semiconductor to produce the electron-hole pair and as lithium ion conductors in their structures. Based on this assumption, there are numerous candidate active material for photovoltaic LIBs.…”

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Photovoltaic lithium-ion battery fabricated by molecular precursor method

Nagai

Suzuki

Takahashi

et al. 2016

Funct. Mater. Lett.

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A novel thin-film lithium-ion battery (LIB) which can be charged by the light irradiation was fabricated by molecular precursor method. The unprecedented, translucent thin-film LIB, fabricated on a fluorine-doped tin oxide pre-coated glass substrate, was attained by using the active materials, titania for anode and LiCoO 2 for cathode, respectively. The averaged potential at 2.04 V was observed by applying a constant current of 0.2 mA. Then, that at 1.82 V was detected after 60 s during the sequential self-discharge process. The charging voltage of the assembled battery was 1.38 V with irradiation of 1-sun, the self-discharge voltage was 1.37 V. Based on the calibration curve of the charging voltages over constant currents ranging from 0-1.0 mA, the detected value can be theoretically reduced to the charging operation by applying a constant current of approximately 60 μA. The charge and discharge of this device was stable voltage at least 30 cycles. The two-in-one device can simultaneously generate and store electricity from solar light, the renewable energy source, and may be applied in smart windows for distributed power system according to on-site demand.Keywords: Photovoltaic device; lithium-ion batteries; translucent; molecular precursor method; thin film.Distributed power generation using renewable energy sources, such as solar light, can efficiently supply electricity according to on-site demand. If the electrodes of lithium-ion batteries (LIBs), which are the dominant power sources for most portable electronics, could function as a solar cell, the storage device could provide electricity without an electric power supply.We recently reported a transparent thin-film device that can function as a LIB. The thin-film LIB was fabricated with Li 4 Ti 5 O 12 (LTO) for the anode and Li 3 Fe 2 (PO 4 ) 3 (LFP) for the cathode on a fluorine-doped tin oxide (FTO) pre-coated glass substrate, and an electrolytic solution dissolving LiPF 6 . A wet process known as the molecular precursor method (MPM) was used to fabricate the active material thin-films with thicknesses of 100 nm on the substrates. 1 In the charge/discharge cyclic test of the LIB assembled with these electrodes, the synchronous electrochromic reactions of the LTO were clearly observed during repeated operation. Therefore, the transparent thin-film LIB has many practical applications, such as monitoring electrochemical reactions and use in electrochromic windows.Zhang et al. reported that titania particles immobilized on an anodic electrode constitute an excellent candidate for LIB active materials because of their high safety, good capacity retention, and low self-discharge. 2 In fact, titania has excellent cyclability and chemical stability and negligible toxicity in LIBs. 3,4 Additionally, anatase nanotubes have also been characterised as active materials and have been shown to have electrochemical potentials of 1.5À1.7 V versus Li/Li þ . 5 Regarding the chemical fabrication of two-in-one LIBs, we are therefore interested in the photovoltaic nature of ...

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The Science of Molecular Precursor Method

Nagai

Sato

2018

Advanced Coating Materials

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Absorption spectra and photocurrent densities of Ag nanoparticle/TiO2 composite thin films with various amounts of Ag

Cited by 23 publications

References 38 publications

Photocatalytic Activity of Vis-Responsive Ag-Nanoparticles/TiO2 Composite Thin Films Fabricated by Molecular Precursor Method (MPM)

Photocatalytic Activity of Vis-Responsive Ag-Nanoparticles/TiO2 Composite Thin Films Fabricated by Molecular Precursor Method (MPM)

Photovoltaic lithium-ion battery fabricated by molecular precursor method

The Science of Molecular Precursor Method

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