In Situ Formation of Micropore-Rich Titanium Dioxide from Metal–Organic Framework Templates

Zhai, Ling; Qian, Yuhong; Wang, Yuxiang; Cheng, Youdong; Dong, Jinqiao; Peh, Shing Bo; Zhao, Dan

doi:10.1021/acsami.8b11920

Cited by 15 publications

(9 citation statements)

References 67 publications

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“…Hydrogen evolution photocatalysts based on non-noble metals including Ti, − Fe, Co, − Ni, − Cu, − Zn, , Mo, − Cd, − and In are being increasingly investigated. In order to decrease the overpotential, the cocatalyst needs active exposed facet and large dispersion, providing fast charge transfer and low surface hydrogen adsorption energy.…”

Section: Photocatalysismentioning

confidence: 99%

State of the Art and Prospects in Metal–Organic Framework (MOF)-Based and MOF-Derived Nanocatalysis

2019

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Metal–organic framework (MOF) nanoparticles, also called porous coordination polymers, are a major part of nanomaterials science, and their role in catalysis is becoming central. The extraordinary variability and richness of their structures afford engineering synergies between the metal nodes, functional linkers, encapsulated substrates, or nanoparticles for multiple and selective heterogeneous interactions and activations in these MOF-based nanocatalysts. Pyrolysis of MOF-nanoparticle composites forms highly porous N- or P-doped graphitized MOF-derived nanomaterials that are increasingly used as efficient catalysts especially in electro- and photocatalysis. This review first briefly summarizes this background of MOF nanoparticle catalysis and then comprehensively reviews the fast-growing literature reported during the last years. The major parts are catalysis of organic and molecular reactions, electrocatalysis, photocatalysis, and views of prospects. Major challenges of our society are addressed using these well-defined heterogeneous catalysts in the fields of synthesis, energy, and environment. In spite of the many achievements, enormous progress is still necessary to improve our understanding of the processes involved beyond the proof-of-concept, particularly for selective methane oxidation, hydrogen production, water splitting, CO2 reduction to methanol, nitrogen fixation, and water depollution.

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Section: Photocatalysismentioning

confidence: 99%

State of the Art and Prospects in Metal–Organic Framework (MOF)-Based and MOF-Derived Nanocatalysis

2019

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“…Titanium (Ti) and Ti alloys exhibit the highest biocompatibility, corrosion resistance, and specific strength (ratio of the tensile strength to density); however, Ti presents a large degree of low abrasion resistance and biomechanical incompatibility with human cortical bone, due to their high elastic modulus. Effective alternative to overcome this problem is the modification of surface structures of Ti or manufacturing Ti alloys, 6 for example, titanium-6 aluminium-4 vanadium (Ti-6Al-4V), which possess the most favourable specific strength and lowest modulus of elasticity in the group of metallic biomaterials. Improvements of surface structures can be represented by morphological modifications or coating modifications or mixture of both.…”

Section: B Iomaterials S 21 | Metallic Materialsmentioning

confidence: 99%

Review of craniofacial regeneration in China

Zhang

Xie

et al. 2019

J of Oral Rehabilitation

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Craniofacial defect is frequently caused by inflammation, trauma, and tumour etc The damaged tissues cannot be fully reconstituting the integrated matrix and regenerate native surface due to the complexity of craniofacial tissues, although with good intrinsic healing capacity. Till now, many approaches, such as manufacturing prosthesis, have obtained limited results. Tissue engineering has been recognised as one of the most effective means to replace or repair damaged tissues, which aims at forming a new viable tissue for a medical purpose. Such approaches need scaffolds that support the attachment, growth and proliferation of cells. With the development of modern medicine, the research of biomaterials has undergone a process from bio-inert materials to bioactive or degradable materials. The first generation of biomaterials was bio-inert materials with high strength, which included the metallic materials, ceramic materials, and polymeric materials. Whereas second-generation biomaterials were designed to be either resorbable or bioactive, the new biomaterials converged the separate concepts of bioactive materials and resorbable materials. Ideally, the scaffold must be of good biocompatibility and suitable physical and mechanical properties, furthermore, the scaffold must possess three-dimensional and properly porous network to allow cell adhesion, and controlled rate of degradation to match new tissue growth in vitro and in vivo. 1,2 Besides, the mechanism of tissue repair is complex and involves several important bioactive factors, 3,4 which function as inductive signals to provide cells with sufficient stimulus to migrate into tissues or biomaterials. Utilisation of growth factors, peptides or small molecules that associated with a natural matrix or biomaterial carrier has been extensively studied. Tissue engineering also utilises living cells as engineering materials, and cells became available as engineering materials when Bodnar et al 5 discovered how to extend telomeres in 1998, producingimmortalised cell lines. Stem cells are self-renewing and multipotent, with unique capacity to regenerate

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“…Microporous metal oxides such as titanium dioxide (TiO 2 ), tin oxide (SnO 2 ), and cerium oxide (CeO 2 ) [ 24–27 ] have good chemical stability, strong interactions with many kinds of gas molecules, and tunable carrier transport properties. Therefore, the microporous metal‐oxide‐wrapped plasmonic metal NPs are expected to have more functions and high stability.…”

Section: Introductionmentioning

confidence: 99%

“…[18][19][20][21][22] However, most MOFs have wide band gaps and are insulators, thus, it is difficult to achieve applications in carrier transport (such as photoelectric conversion and conductometric gas sensing). In addition, the MOF micropores are easily destroyed by acidic gases and even water vapor due to their relatively low structural stability, thus resulting in dramatic performance declines in practical applications.Microporous metal oxides such as titanium dioxide (TiO 2 ), tin oxide (SnO 2 ), and cerium oxide (CeO 2 ) [24][25][26][27] have good chemical stability, strong interactions with many kinds of gas molecules, and tunable carrier transport properties. Therefore, the microporous metal-oxide-wrapped plasmonic metal NPs are This work proposes a novel and simple synthesis method for microporous-ceria-wrapped gold (Au@mp-CeO 2 ) nanoparticles (NPs) based on linker molecule-induced stacking of ultrafine CeO 2 particles (or beads) on the surface of pre-prepared gold NPs.…”

mentioning

confidence: 99%

“…Microporous metal oxides such as titanium dioxide (TiO 2 ), tin oxide (SnO 2 ), and cerium oxide (CeO 2 ) [24][25][26][27] have good chemical stability, strong interactions with many kinds of gas molecules, and tunable carrier transport properties. Therefore, the microporous metal-oxide-wrapped plasmonic metal NPs are This work proposes a novel and simple synthesis method for microporous-ceria-wrapped gold (Au@mp-CeO 2 ) nanoparticles (NPs) based on linker molecule-induced stacking of ultrafine CeO 2 particles (or beads) on the surface of pre-prepared gold NPs.…”

mentioning

confidence: 99%

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Microporous‐Ceria‐Wrapped Gold Nanoparticles for Conductometric and SERS Dual Monitoring of Hazardous Gases at Room Temperature

Bao

Guo

Zhang

et al. 2022

Adv Materials Inter

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metal NPs have relatively high surface energy, and thus easily agglomerate and oxidize. [10] This can lead to unexpected performance losses in practical applications. In addition, bare metal NPs are limited in complex functions, such as modulated carrier transport, enhanced molecular capture, and strong charge separation. In comparison, functional material-wrapped metal NPs have promising reductions in aggregation and can offer more complex functions. [11][12][13][14][15] Among these wrapped metal NPs, microporous shell-[such as silica, and metal-organic frameworks (MOFs)] coated systems have abundant micropores and a large specific surface area. They have great potential applications in molecular catalysis and gas sensing. [16][17][18][19][20][21][22][23] For example, a recent work reported by He, et al. shows that the MOF-5 wrapped Au NPs have a strong enrichment effect of CO 2 gas, thus enabling the detection of CO 2 gas via surface-enhanced Raman spectroscopy (SERS) effect of the Au core. [22] To date, the microporous materials wrapped on a plasmonic metal NPs mainly include MOFs and microporous silica. Microporous silica has only the value as a carrier, stabilizer (for anti-agglomeration or anti-oxidization), and linking ligand. Therefore, microporous-silica-wrapped metal NPs are difficult to offer complex functions (such as strong gas-solid interaction). In contrast, MOF-wrapped metal NPs can likely achieve more functions due to their relatively high chemical activity and other properties. [18][19][20][21][22] However, most MOFs have wide band gaps and are insulators, thus, it is difficult to achieve applications in carrier transport (such as photoelectric conversion and conductometric gas sensing). In addition, the MOF micropores are easily destroyed by acidic gases and even water vapor due to their relatively low structural stability, thus resulting in dramatic performance declines in practical applications.Microporous metal oxides such as titanium dioxide (TiO 2 ), tin oxide (SnO 2 ), and cerium oxide (CeO 2 ) [24][25][26][27] have good chemical stability, strong interactions with many kinds of gas molecules, and tunable carrier transport properties. Therefore, the microporous metal-oxide-wrapped plasmonic metal NPs are This work proposes a novel and simple synthesis method for microporous-ceria-wrapped gold (Au@mp-CeO 2 ) nanoparticles (NPs) based on linker molecule-induced stacking of ultrafine CeO 2 particles (or beads) on the surface of pre-prepared gold NPs. The resulting NPs have a uniform size and microporous CeO 2 shells with a mean thickness of 28 nm and porosity of 42%. The shell is highly tunable from about 4 to 30 nm thick.

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In Situ Formation of Micropore-Rich Titanium Dioxide from Metal–Organic Framework Templates

Cited by 15 publications

References 67 publications

State of the Art and Prospects in Metal–Organic Framework (MOF)-Based and MOF-Derived Nanocatalysis

State of the Art and Prospects in Metal–Organic Framework (MOF)-Based and MOF-Derived Nanocatalysis

Review of craniofacial regeneration in China

Microporous‐Ceria‐Wrapped Gold Nanoparticles for Conductometric and SERS Dual Monitoring of Hazardous Gases at Room Temperature

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