General information about pyrolysis

Moldoveanu, Serban C.

doi:10.1016/b978-0-12-818571-1.00001-7

Cited by 9 publications

(2 citation statements)

References 51 publications

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“…As shown in Figure b, SDVB is composed of C–S and S–S bonds with the benzene ring. Unlike the high BDE value of the C–H bond in the benzene ring (about 474.9 kJ/mol), the C–S and S–S bonds of SDVB show BDE values of 271.96 and 225.94 kJ/mol, respectively, which are quite low compared to the typical C–C single bonds (347.27 kJ/mol) . The computational model is constructed as shown in Figure a, to mimic the SDVB structure.…”

Section: Resultsmentioning

confidence: 99%

Systematic Control of Sulfur Chain Length of High Refractive Index, Transparent Sulfur-Containing Polymers with Enhanced Thermal Stability

et al. 2022

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We herein report the preparation of high refractive index polymers (HRIPs) with enhanced thermal stability from the copolymerization of S 8 and divinylbenzene (DVB) in a single step through sulfur chemical vapor deposition (sCVD). Varying the process temperature in sCVD allowed for the preparation of a series of high sulfur content polymers which, in comparison to previously reported sulfur-derived polymers with similar compositions, displayed significantly enhanced solvent resistance, glass transition temperature (T g ), and thermal stability attributed to the absence of long polysulfide chains in the polymer matrix. The resulting HRIP films displayed high transmittance over the entire visible range while showing an unprecedentedly high T g of 110 °C, which is one of the highest to date among HRIPs with refractive index (RI) exceeding 1.8 reported to date. With the combination of ultrahigh (>1.8) RI, thermal stability, and high T g , the HRIPs can serve as compelling materials for advanced optical applications.

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Section: Resultsmentioning

confidence: 99%

Systematic Control of Sulfur Chain Length of High Refractive Index, Transparent Sulfur-Containing Polymers with Enhanced Thermal Stability

et al. 2022

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“…To form the specific surface boundary along the shape of the metal NPs, DUV light of 185 and 254 nm wavelengths, i.e., photon energies of 647 and 471 kJ·mol –1 , respectively, were irradiated on the film surface (Figure b, IV). This irradiated energy was strong enough to break the Si–O (445 kJ·mol –1 ), Si–C (375 kJ·mol –1 ), and C–C (348 kJ·mol –1 ) bonds, while the DTS-treated surface below the core NPs was protected from the DUV light. As a result of the DUV treatment, a clear DTS–surface boundary corresponding to the shape of the Ag NPs became evident (Figure b, V).…”

Section: Resultsmentioning

confidence: 99%

Exfoliation Technology for Scalable Ligand-Free Core–Semishell Metal Nanoparticle Films

Lee,

Kang,

Kang

et al. 2023

ACS Appl. Mater. Interfaces

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Core–shell metallic nanoparticles (NPs) are considered promising materials for their multifunctional properties. However, traditionally synthesized NPs have crucial issues that their ligands interfere with the direct interaction between NPs and neighboring materials, and it is very difficult to form a uniform film without the mixture of a template. In this article, we report an unprecedented exfoliation technology for fabricating a scalable ligand-free core–semishell metal NP film based on the evaporation system through a self-assembled monolayer-assisted surface energy control combined with a deep ultraviolet surface treatment around the core NPs. Owing to fabrication merits, the properties of the core–semishell NPs can be easily modulated depending on the shell material; the ligand-free core–shell NPs are directly attached to the surface of a material by Scotch tape, allowing interfacial interactions. Therefore, the proposed technique presents a new scientific method for studying interfacial interactions with heterogeneous materials and can be universally applied in optoelectronic devices, biopatches, photocatalysts, and so on.

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Symmetric “Double Spiro” Wide Energy Gap Hosts for Blue Phosphorescent OLED Devices

Idris

et al. 2021

Advanced Optical Materials

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Wide energy gap materials dispiro[fluorene‐9,9′‐anthracene‐10′,9″‐fluorene] (SAS) and dispiro[xanthene‐9,9′‐anthracene‐10′,9″‐xanthene] (XAX) containing double spiro–carbons, are introduced as hosts for blue phosphorescent organic light‐emitting diodes (PHOLEDs). Both SAS and XAX are free of heteroatomic exocyclic bonds, which are implicated in limiting the stability of blue PHOLEDs. The materials are synthesized in gram‐scale quantities through short and efficient paths. They have large energy gaps (≥5.0 eV) between the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) and correspondingly have high triplet energies in solid state (ET ≈ 3.0 eV). Analysis of devices using SAS and XAX as host materials with the blue phosphorescent dopant fac‐tris(N,N‐di‐p‐tolyl‐pyrizinoimidazol‐2‐yl)iridium(III) (Ir(tpz)3), shows that charges are transported and trapped by the dopant, which subsequently forms excitons directly on the phosphor. As a result, luminescence quenching pathways are suppressed which leads to blue phosphorescent devices with high (≈18%) external quantum efficiency. Thus, SAS and XAX serve as promising host materials, with high triplet energies suitable for blue PHOLEDs.

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General information about pyrolysis

Cited by 9 publications

References 51 publications

Systematic Control of Sulfur Chain Length of High Refractive Index, Transparent Sulfur-Containing Polymers with Enhanced Thermal Stability

Systematic Control of Sulfur Chain Length of High Refractive Index, Transparent Sulfur-Containing Polymers with Enhanced Thermal Stability

Exfoliation Technology for Scalable Ligand-Free Core–Semishell Metal Nanoparticle Films

Symmetric “Double Spiro” Wide Energy Gap Hosts for Blue Phosphorescent OLED Devices

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