Energy band alignment at the heterointerface between a nanostructured TiO2 layer and Au22(SG)18 clusters: relevance to metal-cluster-sensitized solar cells

Larina, Liudmila L.; Omelianovych, Oleksii; Dao, Van‐Duong; Pyo, Kyunglim; Choi, Ho‐Suk

doi:10.1039/d0nr06662a

Cited by 17 publications

(10 citation statements)

References 43 publications

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“…After annealing the samples at 500 °C, the contribution of lower Ti oxidation state (3+ and 2+) increases, which is revealed as a significant increase in the spectral intensity from the low-energy side of the TiO 2 states. In particular, the intense components at 458.6 and 463.8 eV and the weak components at 457.0 and 462.6 eV in the spectra of the 500-TiD-100 and 500-Ti-D-111 samples can be attributed to Ti 2 O 3 and TiO [ 48 , 50 ], respectively. Further annealing removes most of the oxygen from the oxidized titanium layers (the content of titanium oxide states is about 9% and 5% of the total titanium content, respectively).…”

Section: Resultsmentioning

confidence: 99%

Effect of Titanium and Molybdenum Cover on the Surface Restructuration of Diamond Single Crystal during Annealing

et al. 2023

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Diamond is an important material for electrical and electronic devices. Because the diamond is in contact with the metal in these applications, it becomes necessary to study the metal–diamond interaction and the structure of the interface, in particular, at elevated temperatures. In this work, we study the interaction of the (100) and (111) surfaces of a synthetic diamond single crystal with spattered titanium and molybdenum films. Atomic force microscopy reveals a uniform coating of titanium and the formation of flattened molybdenum nanoparticles. A thin titanium film is completely oxidized upon contact with air and passes from the oxidized state to the carbide state upon annealing in an ultrahigh vacuum at 800 °C. Molybdenum interacts with the (111) diamond surface already at 500 °C, which leads to the carbidization of its nanoparticles and catalytic graphitization of the diamond surface. This process is much slower on the (100) diamond surface; sp2-hybridized carbon is formed on the diamond and the top of molybdenum carbide nanoparticles, only when the annealing temperature is raised to 800 °C. The conductivity of the resulting sample is improved when compared to the Ti-coated diamond substrates and the Mo-coated (111) substrate annealed at 800 °C. The presented results could be useful for the development of graphene-on-diamond electronics.

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Section: Resultsmentioning

confidence: 99%

Effect of Titanium and Molybdenum Cover on the Surface Restructuration of Diamond Single Crystal during Annealing

et al. 2023

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“…The photosensitizing ability of Au n (SG) m NCs depends on the NC size (Figure 26B), [ 319,320 ] the ligands that are incorporated, [ 321 ] and the degree of heteroatom substitution. [ 322 ]…”

Section: Photosensitizationmentioning

confidence: 99%

“…The followings are several important aspects of the use of Au n (SR) m NCs as photosensitizers in solar cells: Au n (SG) m NCs have been found to function as photosensitizers in solar cells using TiO 2 as the semiconductor (Figure 26A). [ 315–318 ] The photosensitizing ability of Au n (SG) m NCs depends on the NC size (Figure 26B), [ 319,320 ] the ligands that are incorporated, [ 321 ] and the degree of heteroatom substitution. [ 322 ] TiO 2 solar cells including Au 18 (SG) 14 as the photosensitizer and I − /I 3 − as the redox pair have demonstrated a high power conversion efficiency (PCE) of 3.8% (Figure 26C).…”

Section: Photosensitizationmentioning

confidence: 99%

“…Reproduced with permission: Copyright 2019, American Chemical Society [294] F I G U R E 2 5 A diagram of a dye-sensitized solar cell using Au n (SR) m nanoclusters (NCs) as a photosensitizer 2. The photosensitizing ability of Au n (SG) m NCs depends on the NC size (Figure 26B), [319,320] the ligands that are incorporated, [321] and the degree of heteroatom substitution. [322] 3.…”

Section: Energy and Environmental Materialsmentioning

confidence: 99%

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Atomically precise thiolate‐protected gold nanoclusters: Current status of designability of the structure and physicochemical properties

et al. 2022

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Thiolate (SR)‐protected gold nanoclusters (Aun(SR)m NCs) are a rare type of material capable of simultaneously exhibiting multiple physicochemical properties well‐suited to specific applications, including photoluminescence, thermocatalysis, electrocatalysis, photocatalysis, magnetism, and optical activity. Over the past several decades, there has been tremendous progress in our understanding of the structure and physicochemical properties of Aun(SR)m NCs, resulting in the ability to fine‐tune the characteristics of these materials. It is therefore helpful to examine the extent to which the properties of Aun(SR)m and related metal NCs can now be adjusted based on design. This review presents representative examples of previous studies concerning the geometry, electronic structure, luminescence properties, catalysis, magnetism and optical activity of Aun(SR)m and related metal NCs and discusses the current status of the designability of these NCs to impart specific structural and physicochemical characteristics. This information is expected to accelerate the fabrication of highly functional materials based on Aun(SR)m and related metal NCs.

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“…An energy diagram depicting the possible mechanism of Pb 2+ oxidation by hot holes is shown on the right. CB and VB are the conduction band and valence band of TiO 2 .…”

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confidence: 99%

Tuning the Chiral Growth of Plasmonic Bipyramids via the Wavelength and Polarization of Light

Qiao,

Bordoloi,

Miyashita

et al. 2024

Nano Lett.

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Circularly polarized light (CPL) is a versatile tool to prepare chiral nanostructures, but the mechanism for inducing enantioselectivity is not well understood. This work shows that the energy and polarization of visible photons can initiate photodeposition at different sites on plasmonic nanocrystals. Here, CPL on achiral gold bipyramids (AuBPs) creates hot holes that oxidatively deposit PbO 2 asymmetrically. We show for the first time that the location of PbO 2 photodeposition and hence optical dissymmetry depends on the CPL wavelength. Specifically, 488 and 532 nm CPL induce PbO 2 growth in the middle of AuBPs, whereas 660 nm CPL induces PbO 2 growth at the tips. Our observations show that wavelengthdependent plasmonic field distributions are more important than surface lightning rod effects in localizing plasmon-mediated photochemistry. The largest optical dissymmetry occurs at excitation wavelengths between the transverse and longitudinal resonances of the AuBPs because higher-order modes are required to induce chiral electric fields.

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Energy band alignment at the heterointerface between a nanostructured TiO₂ layer and Au₂₂(SG)₁₈ clusters: relevance to metal-cluster-sensitized solar cells

Abstract: This study is the first to quantify energy band alignments at a nanostructured TiO2/Au22(SG)18 cluster interface using X-ray photoelectron spectroscopy. The d-band of Au clusters shows band-like character and occupied...

Cited by 17 publications

References 43 publications

Effect of Titanium and Molybdenum Cover on the Surface Restructuration of Diamond Single Crystal during Annealing

Effect of Titanium and Molybdenum Cover on the Surface Restructuration of Diamond Single Crystal during Annealing

Atomically precise thiolate‐protected gold nanoclusters: Current status of designability of the structure and physicochemical properties

Tuning the Chiral Growth of Plasmonic Bipyramids via the Wavelength and Polarization of Light

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