Review of photoluminescence performance of nano-sized semiconductor materials and its relationships with photocatalytic activity

Jing, Liqiang; Qu, Yanbin; Wang, Baiqi; Li, Shudan; Jiang, Baojiang; Yang, Ling; Fu, Wei; Fu, Honggang; Sun, Jiang

doi:10.1016/j.solmat.2005.11.007

Cited by 1,724 publications

(593 citation statements)

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“…While characterisation of TiO2-based photocatalysts uses standard techniques such as UV-vis spectroscopy, valence band XPS, dye degradation insights into the dynamics of electrons and holes and defects can be obtained from Transient Absorption Spectroscopy (TAS) [51][52][53][54][55] and photoluminescence (PL) [56][57][58] . TAS provides high temporal resolution (ca.…”

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confidence: 99%

Design of Novel Visible Light Active Photocatalyst Materials: Surface Modified TiO₂

et al. 2016

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Type of publicationArticle (peer-reviewed) AbstractThis progress review describes our work on the design of new TiO2 based photocatalysts. The key concept is the formation of composite structures through the modification of anatase and rutile TiO2 with molecular-sized nanoclusters of metals oxides. Our density functional theory (DFT) level simulations have been compared with experimental work synthesizing and characterizing surface modified TiO2. We use DFT to show that nanoclusters of metal oxides such as TiO2, SnO/SnO2, PbO/PbO2, ZnO and CuO are stable when adsorbed at rutile and anatase surfaces and can lead to a significant red shift in the absorption edge which will induce visible light absorption; this is the first requirement for a useful photocatalyst. We determine the origin of the red shift and the fate of excited electrons and holes. For p-block metal oxides the oxidation state of Sn and Pb can be used to modify the magnitude of the red shift and its mechanism. We describe comparisons of recent experimental studies of surface modified TiO2 that validate our DFT simulations. These nanocluster-modified TiO2 structures 2 form the basis of a new class of photocatalysts which will be useful in oxidation reactions and with a correct choice of nanocluster modified can be applied to other reactions.

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confidence: 99%

Design of Novel Visible Light Active Photocatalyst Materials: Surface Modified TiO₂

et al. 2016

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“…11-13 49 Titania doped with main group elements has attracted 50 great interest after the report of nitrogen and other anion 51 (S, C, and F) doped visible-light active (VLA) titania cata-52 lyst by Asahi and co-workers. 14 These second-generation 53 TiO 2 materials were photoactive over the UV and visible- 54 light region. Controversy still remains about the nature of 55 the dopant species and electronic structure of nitrogen 56 doped titania, which is highly dependent on the method of 57 preparation.…”

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confidence: 99%

Highly Visible Light Active TiO_2−xN_x Heterojunction Photocatalysts

Seery²,

et al. 2010

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Nitrogen doped anatase-rutile heterojunctions are successfully synthesized through an ethylenediaminetetraacetic acid (EDTA) modified sol−gel process. An FT-IR study of EDTA modified TiO2 gel confirms the existence of an ionic intermediate (as indicated by a Δν value of 233 cm−1). Differential scanning calorimetry (DSC), X-ray diffraction (XRD), and Raman spectroscopy are employed to study the phase evolution, phase purity, and crystallite size of samples. Formations of O−Ti−N and N−Ti−N bonds in calcined samples are confirmed using XPS and FT-IR spectroscopy. All EDTA modified samples show significantly higher visible light photocatalytic activity than the unmodified sample. The most active nitrogen doped heterojunction obtained at 400 °C exhibits 9-fold visible light activity in comparison to the standard photocatalyst Degussa P-25. It is proposed that the photo excited electrons (from the visible midgap level) are effectively transferred from the conduction band of anatase to that of rutile causing effective electron−hole separation, which is responsible for the higher visible light activity and lower photoluminescence (PL) intensity.

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“…8, top) can be ascribed to the overlap of band-to-band and exciton emissions; one centred at 410 nm, the other appearing as the multiple bands at >445 nm. 30 Also, it can be noticed that upon zinc doping, the short wavelength tail below 410 nm is substantially diminished. This implies that Zn considerably suppresses the most energetic band-to-band recombination, consequently boosting the exciton emission component.…”

Section: Photoluminescence Spectroscopymentioning

confidence: 99%

Understanding synergetic effects of Zn and Rh–Cr promotion to wide-bandgap Ga, Ta and Ti oxides in photocatalytic water splitting

Bazzo

Urakawa

2016

Catal. Sci. Technol.

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a Promotion of semiconductor metal oxides by specific chemical elements is a widespread approach to enhance photocatalytic water splitting activity. Extraordinary boosting in the activity has been recently reported by Zn (dopant) and Rh-Cr (co-catalyst) promotion to Ga-oxide based photocatalysts. Herein, we report the general applicability of the effectiveness of the promotion strategy used for Ga oxides to Ta and Ti oxides in water splitting under UV irradiation using a slurry reactor. Photophysic characterization (photoluminescence and its decay) was used to clarify the specific roles of Zn and Rh-Cr and their synergetic catalytic action. Our experiments indicate that Zn acts as a booster of charge separation lifetime. Zn-promotion alone, however, does not trigger a great boost in catalytic activity in absence of Rh-Cr. Only when Rh-Cr is added the charge separation boost is fully exploited and driven within the catalyst towards overall water splitting. Effective wavelength ranges of excitation UV light source were also investigated in detail, leading to questioning the dominant semiconductor bandgap model for this class of catalysts.

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Review of photoluminescence performance of nano-sized semiconductor materials and its relationships with photocatalytic activity

Cited by 1,724 publications

References 37 publications

Design of Novel Visible Light Active Photocatalyst Materials: Surface Modified TiO₂

Design of Novel Visible Light Active Photocatalyst Materials: Surface Modified TiO₂

Highly Visible Light Active TiO_2−xN_x Heterojunction Photocatalysts

Understanding synergetic effects of Zn and Rh–Cr promotion to wide-bandgap Ga, Ta and Ti oxides in photocatalytic water splitting

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Review of photoluminescence performance of nano-sized semiconductor materials and its relationships with photocatalytic activity

Cited by 1,724 publications

References 37 publications

Design of Novel Visible Light Active Photocatalyst Materials: Surface Modified TiO2

Design of Novel Visible Light Active Photocatalyst Materials: Surface Modified TiO2

Highly Visible Light Active TiO2−xNx Heterojunction Photocatalysts

Understanding synergetic effects of Zn and Rh–Cr promotion to wide-bandgap Ga, Ta and Ti oxides in photocatalytic water splitting

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Design of Novel Visible Light Active Photocatalyst Materials: Surface Modified TiO₂

Design of Novel Visible Light Active Photocatalyst Materials: Surface Modified TiO₂

Highly Visible Light Active TiO_2−xN_x Heterojunction Photocatalysts