A facile solid phase reaction to prepare TiO2 mesocrystals with exposed {001} facets and high photocatalytic activity

Zhou, Li; Chen, Jin; Ji, Chuan; Zhou, Lei; O’Brien, Paul

doi:10.1039/c3ce27095e

Cited by 35 publications

(41 citation statements)

References 14 publications

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“…Each TiO2 MC sample was incubated with an aqueous solution of crystal violet and the resultant solution exposed to UV light. 10,40 Decreasing dye intensity over time gives a measure of photocatalytic efficiency (ESI). As a control experiment NH4TiOF3 MCs were also similarly assessed and showed no evidence of dye degradation.…”

Section: Resultsmentioning

confidence: 99%

“…8,10 Annealing times of 2, 4 or 8 hours were used and the resultant materials characterized by SEM, FT-IR, Raman and XRD and the TiO2 MCs were assessed for their photocatalytic efficiency.…”

Section: Resultsmentioning

confidence: 99%

“…Optimization of this process resulted in anatase TiO2 MCs with good photocatalytic efficiencies which are comparable with data reported elsewhere for such systems. 10 The work has also given new insights into the formation of anatase mesocrystals and in particular sheds light on how the Ti-PEG interactions serve to direct the crystallisation process. Determining the ratio of Ti atoms to PEG enabled a model to be developed for the MC formation process.…”

Section: Discussionmentioning

confidence: 99%

“…6,8,9 The shape, period, size and morphology of the self-organized structures (MCs) show a strong structural dependence upon the polymer used. Such structures may be important for: photocatalysis, 10,11 dye-sensitized solar cells, 11 fibre optics, 6 sensors, 6 and bioimplants. 12 Following the original work on the polymer-mediated growth of anatase using Brij polymers, 13,14 many groups have reported on this methodology for the synthesis of such materials.…”

Section: Introductionmentioning

confidence: 99%

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New insights into polymer mediated formation of anatase mesocrystals

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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New insights into polymer mediated formation of anatase mesocrystals

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“…This definition has been developed in recent years, where MCs are defined entirely according to their structures rather than their formation mechanism. 12 In this decade, a variety of MCs of metal oxides (for example, TiO 2 , [13][14][15][16][17][18][19][20][21][22][23] ZnO, [24][25][26][27][28][29][30][31][32][33][34] hematite (a-Fe 2 O 3 ), [35][36][37][38][39][40] maghemite (g-Fe 2 O 3 ), 41 Co 3 O 4 , 42 SnO, [43][44][45] Ag 2 O, 46 CuO [47][48][49] ), metal chalcogenides (for example, ZnS, 50,51 PbS, 52 PbSe 53,54 ), metals (for example, Au, 55 Ag, 56,57 Cu, 58 Pt, 59,60 Pd 61 ), organic compounds (for example, DL-alanine, 62,63…”

Section: Introductionmentioning

confidence: 99%

Metal oxide mesocrystals with tailored structures and properties for energy conversion and storage applications

Tachikawa

Majima

2014

NPG Asia Mater

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Mesocrystals (MCs) are superstructures with a crystallographically ordered alignment of nanoparticles. Owing to their organized structures, MCs posses some unique characteristics such as a high surface area, pore accessibility, and good electronic conductivity and thermal stability; thus, MCs could be beneficial for many areas of research and application. This review begins with a description of the common synthesis strategies for, and characterization and fundamental properties of metal oxide MCs. Newly developed analytical methods (that is, photoconductive atomic force microscopy and single-molecule, single-particle fluorescence microscopy) for unraveling the charge transport and photocatalytic properties of individual MCs are then introduced. Further, recent developments in the applications of various metal oxide MCs, especially in the fields of energy conversion and storage, are also reviewed. Finally, several perspectives in terms of future research on MCs are highlighted. NPG Asia Materials (2014) 6, e100; doi:10.1038/am.2014.21; published online 16 May 2014 Keywords: energy storage; mesocrystal; metal oxide; photocatalysis; solar energy conversion; superstructure INTRODUCTIONThe self-assembly of nanoparticle building blocks into highly ordered superstructures is one of the actively pursued research topics in materials science and technology. 1-4 Such hierarchical architectures have potentially tunable electronic, optical and magnetic properties, which promise various applications ranging from catalysis to optoelectronics. A mesocrystal (MC), which was first introduced by Cölfen in the early years of 2000s, is defined as a superstructure consisting of nanoparticles on the scale of several hundred nanometers to micrometers. [5][6][7][8][9][10][11] In contrast to the classical mechanism of atom/ ion-mediated growth of a single crystal, the particle-mediated growth mechanisms of MCs are termed as non-classical crystallization (Figure 1). This definition has been developed in recent years, where MCs are defined entirely according to their structures rather than their formation mechanism. 12 In this decade, a variety of MCs of metal oxides (for example, TiO 2 , 13-23 ZnO, [24][25][26][27][28][29][30][31][32][33][34] Among metal oxides, TiO 2 is used in many applications that deal with environmental and energy problems (for example, photodegradation of pollutants, 67 water splitting for H 2 evolution, 68 dyesensitized solar cells 68 and lithium-ion batteries 69 ) owing to its

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Promoting Charge Separation in Semiconductor Nanocrystal Superstructures for Enhanced Photocatalytic Activity

Wang

Cai

Sun

et al. 2018

Adv Materials Inter

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Increasing the lifetime of photoexcited charge carriers in metal oxide semiconductor nanocrystals is essential for the promotion of their photocatalytic efficiency. In this context, different strategies are developed for tailoring the structural and electronic properties of semiconductors at the single nanocrystal level, mainly including band‐structure engineering, doping, catalyst‐support interaction tuning, and cocatalysts decoration. Recently, an alternative strategy for prolonging the lifetime of photoexcited charge carriers is discovered at the nanocrystal superstructure level. By assembling semiconductor nanocrystals into ordered superstructures, a new pathway is created for the spatial separation of charge carriers between neighboring nanocrystals within the superstructure network. The inter‐nanocrystal charge transfer in the superstructures enables the increased charge separation efficiency of photogenerated electron–hole pairs, prolongs their lifetime and, in turn, improves the photocatalytic activity. In this review, recent developments of nanocrystal‐superstructure‐based photocatalysts and their applications in catalyzing different reactions are summarized. Several perspectives in terms of challenges and future research in this area are highlighted.

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A facile solid phase reaction to prepare TiO2 mesocrystals with exposed {001} facets and high photocatalytic activity

Cited by 35 publications

References 14 publications

New insights into polymer mediated formation of anatase mesocrystals

New insights into polymer mediated formation of anatase mesocrystals

Metal oxide mesocrystals with tailored structures and properties for energy conversion and storage applications

Promoting Charge Separation in Semiconductor Nanocrystal Superstructures for Enhanced Photocatalytic Activity

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