Plasmon enhanced visible light photocatalytic activity in polymer-derived TiN/Si-O-C-N nanocomposites

Awin, Eranezhuth Wasan; Lale, Abhijeet; Kumar, Krishna; Demirci, Umit B.; Bernard, Samuel; Kumar, Ravi

doi:10.1016/j.matdes.2018.06.060

Cited by 23 publications

(13 citation statements)

References 55 publications

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“…Then, the SSPs are converted in a first pyrolysis step under ammonia to reduce or even eliminate the carbon-based organic groups present in the polymer while a single-phase amorphous ceramic is generated at 1000 ○ C. The latter is subsequently heat-treated at higher temperatures under nitrogen to form the UHTC nanophase providing nanocomposites composed of MN nanocrystals (M Ti, Hf) homogeneously distributed in an amorphous matrix. [151][152][153][154][155] The first report focused on the design of TiN/Si 3 N 4 nanocomposites involved the reaction between a commercially available polysilazane, i.e., perhydropolysilazane (PHPS), and a metallorganic compound namely tetrakisdimethylaminotitanium (TDMATi) in a 2.5:1 molar ratio. The reaction formed a perhydropolytitanosilazane with a chemical formula of [Si 1.1 Ti 0.4 C 2.2 N 1.1 H 6.2 ] n and a molecular weight of 4200 g mol -1…”

Section: Uhtc (Nano)composites With High Content Of Silica Former (Ie 80-vol%)mentioning

confidence: 99%

“…By changing the chemistry of the precursors and using polyhydridomethylsiloxane (PHMS) as a matrix precursor and titanium tetra-n-butoxide as a precursor of the nanophase, nanocomposites made of TiN nanocrystals of approximately 4 nm size homogeneously distributed in an amorphous SiOCN matrix have been generated at 1200 ○ C. [151] The photocatalytic properties of the nanocomposites with respect to dye degradation have been evaluated. The visible light photocatalytic activity ≤ Figure 14.…”

Section: Uhtc (Nano)composites With High Content Of Silica Former (Ie 80-vol%)mentioning

confidence: 99%

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Polymer‐Derived Ultra‐High Temperature Ceramics (UHTCs) and Related Materials

et al. 2019

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Ultra‐high temperature ceramics (UHTCs) represent an emerging class of materials capable of providing mechanical stability and heat dissipation upon operation in extreme environments, e.g., extreme heat fluxes, chemically reactive plasma conditions. In the last few decades, remarkable research efforts and progress were done concerning the physical properties of UHTCs as well as their processing. Moreover, there are vivid research activities related to developing synthetic access pathways to UHTCs and related materials with high purity, tunable composition, nano‐scaled morphology, or improved sinterability. Among them, synthesis methods considering preceramic polymers as suitable precursors to UHTCs have received increased attention in the last few years. As these synthesis techniques allow the processing of UHTCs from the liquid phase, they are highly interesting, e.g., for the fabrication of ultra‐high temperature ceramic composites (UHT CMCs), additive manufacturing of UHTCs, etc. In the present review, UHTCs are in particular discussed within the context of their physical properties as well as energetics. Moreover, various synthesis methods using preceramic polymers to access UHTCs and related materials (i.e., (nano)composites thereof with silica former phases) are summarized and critically evaluated.

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Section: Uhtc (Nano)composites With High Content Of Silica Former (Ie 80-vol%)mentioning

confidence: 99%

Section: Uhtc (Nano)composites With High Content Of Silica Former (Ie 80-vol%)mentioning

confidence: 99%

Polymer‐Derived Ultra‐High Temperature Ceramics (UHTCs) and Related Materials

et al. 2019

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“…These pioneering works nicely marked the beginning of the new field of PCPs and illustrated the contribution of organosilicon precursor chemistry to PDCs. In the forthcoming years, there has been much activity worldwide in the PDCs field, and the organosilicon precursor chemistry remained the highest active contributor to this topic, as illustrated in a majority of references …”

Section: The Polymer‐derived Ceramics Routementioning

confidence: 99%

“…In the forthcoming years, there has been much activity worldwide in the PDCs field, and the organosilicon precursor chemistry remained the highest active contributor to this topic, as illustrated in a majority of references. 36,[53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69] Organosilicon precursors, such as halogenosilanes, made an increasingly important contribution to the research development and manufacture of PDCs. For instance, chlorosilanes have been investigated for the synthesis of polysiloxanes by hydrolysis of Si-Cl bonds followed by subsequent condensation of the Si-OH intermediates to form Si-O-Si groups in polysiloxanes ( Figure 2).…”

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confidence: 99%

Tape casting of preceramic polymers toward advanced ceramics: A review

Hotza

Nishihora

Machado

et al. 2019

Int J Ceramic Engine & Sci

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In the last 20 years, tape casting, a standard wet‐shaping process to produce thin ceramics, has been applied to manufacture polymer‐derived ceramics (PDCs). Si‐based polymers, such as polysiloxanes and polysilazanes, also known as preceramic polymers (PCPs), have been used as precursors/binders replacing conventional raw materials and additives for tape casting process. Thermal processing of PCPs is carried out at lower temperatures in comparison with classical ceramic sintering, particularly of carbides and nitrides. Furthermore, polymeric precursors can be converted into hybrid or composite ceramics, when parts of the polymers remain unreacted. Inert or reactive fillers might be used to reduce both shrinkage and porosity inherently caused by the weight loss occurring during polymer pyrolysis while forming new ceramic phases in the final materials. Alternatively, pore formers might also be added to tailor pore shape, connectivity, and volume (macroporosity). Nevertheless, current equipment and process parameters for tape casting‐based products must be eventually adjusted to fit the characteristics of ceramic precursors. Therefore, the aim of this review is focused on listing and discussing the efforts to produce PDCs using tape casting as a shaping technique. Interactions of system components and effects of treatment, particularly thermal stages, on final microstructure and properties are stressed out. Gaps in the literature concerning processing optimization are pointed out, and suggestions are given for further development of PDCs produced by tape casting.

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“…The development of nanocomposites in which the structure of at least one phase is designed at nanoscale allows improved performance in applications that can reach far beyond those of conventional polymer derived ceramics [5–8]. For example, nano‐titania (anatase phase) based silicon oxycarbide ceramics, i. e ., titania‐silicon oxycarbide nanocomposites, as a material for photocatalytic application has the advantage compared to conventional materials due to the combinatorial effect: the silicon oxycarbide phase providing mechanical support whereas titania promoting photocatalysis [9]. However, the mechanical properties of polymer derived ceramics‐based nanocomposites have received limited attention so far compared to the photocatalytic aspects.…”

Section: Introductionmentioning

confidence: 99%

Mechanical characterization of spark plasma sintered titania‐silicon oxycarbide (TiO₂/SiOC) nanocomposites

Awin

Bernard

Kumar

2022

Materialwissenschaft Werkst

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In this work, titania‐silicon oxycarbide nanocomposites synthesized via the polymer derived ceramics route have been sintered into crack‐free monoliths using spark plasma sintering and their mechanical properties as well as their apparent density have been characterized. The x‐ray diffractogram clearly showed the stabilization of anatase phase of size less than 10 nm size in an amorphous silicon oxycarbide matrix at 1200 °C. The hardness and elastic modulus determined using nanoindentation were found to be 9 GPa and 82 GPa, respectively, and the fracture toughness calculated using indentation crack length method was found to be 2.34 MPa m1/2. In addition to this, ball‐on‐three ball technique was used to evaluate the biaxial flexural strength and fractographic studies were carried out to understand the fracture mechanisms.

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Plasmon enhanced visible light photocatalytic activity in polymer-derived TiN/Si-O-C-N nanocomposites

Cited by 23 publications

References 55 publications

Polymer‐Derived Ultra‐High Temperature Ceramics (UHTCs) and Related Materials

Polymer‐Derived Ultra‐High Temperature Ceramics (UHTCs) and Related Materials

Tape casting of preceramic polymers toward advanced ceramics: A review

Mechanical characterization of spark plasma sintered titania‐silicon oxycarbide (TiO₂/SiOC) nanocomposites

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Plasmon enhanced visible light photocatalytic activity in polymer-derived TiN/Si-O-C-N nanocomposites

Cited by 23 publications

References 55 publications

Polymer‐Derived Ultra‐High Temperature Ceramics (UHTCs) and Related Materials

Polymer‐Derived Ultra‐High Temperature Ceramics (UHTCs) and Related Materials

Tape casting of preceramic polymers toward advanced ceramics: A review

Mechanical characterization of spark plasma sintered titania‐silicon oxycarbide (TiO2/SiOC) nanocomposites

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Mechanical characterization of spark plasma sintered titania‐silicon oxycarbide (TiO₂/SiOC) nanocomposites