Photoconductive polyimides derived from a novel imidazole-containing diamine

2019 ◽  
Vol 32 (6) ◽  
pp. 620-630
Author(s):  
Keuk-Min Jeong ◽  
Pradip Kumar Tapaswi ◽  
Takehiko Kambara ◽  
Ryohei Ishige ◽  
Shinji Ando ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Lone Pair ◽  
Imidazole Ring ◽  
Hole Transport ◽  
High Thermal Stability ◽  
High Electron ◽  
Good Thermal Stability ◽  
Biphenyltetracarboxylic Dianhydride ◽  
Lone Pair Electrons ◽  
Tetracarboxylic Dianhydride

A new diamine containing an imidazole structure, 4,4′-(4,5-diphenyl-1H-imidazole-1,2-diyl)dianiline (DIMA), was synthesized to prepare photoconductive polyimides (PIs) with four types of dianhydrides such as 3,3′,4,4′-biphenyltetracarboxylic dianhydride, 4,4′-oxyduphthalic anhydride, 4,4′-(hexafluoroisopropylidene) diphthalic anhydride, and cyclobutane-1,2,3,4,-tetracarboxylic dianhydride, based on the fact that the imidazole ring is a useful n-type block with high electron-donating property and good thermal stability. The imidazole-containing diamine possesses high electron-donating properties due to the lone pair electrons at nitrogen, which affords a high hole-transport property. All the PIs prepared from DIMA were amorphous due to the large side group and kink structure of the diamine, optically transparent (transmittances of 92–98% at 450 nm), and exhibited high thermal stability (10% weight loss temperatures ranged 453–558°C).

Fabrication and Surface Engineering of Two-Dimensional SnS Toward Piezoelectric Nanogenerator Application

MRS Advances ◽  
2018 ◽  
Vol 3 (45-46) ◽  
pp. 2809-2814 ◽  
Author(s):  
Naoki Higashitarumizu ◽  
Hayami Kawamoto ◽  
Keiji Ueno ◽  
Kosuke Nagashio
Keyword(s):  
Thermal Stability ◽  
Surface Morphology ◽  
Oxide Layer ◽  
Chemical Treatment ◽  
Surface Engineering ◽  
Lone Pair ◽  
Covalent Bonding ◽  
Two Dimensional ◽  
Lone Pair Electrons ◽  
Thermal Stability Of

ABSTRACTMechanical exfoliation is performed to fabricate ultrathin SnS layers, and chemical/thermal stability of SnS layers is discussed in comparison with GeS, toward piezoelectric nanogenerator application. Both SnS and GeS are difficult to be exfoliated under 10 nm using tape exfoliation due to strong interlayer ionic bonding by lone pair electrons in Sn or Ge atoms. Au-mediated exfoliation enables to fabricate larger-scale ultrathin SnS and GeS layers thinner than 10 nm owing to strong semi-covalent bonding between Au and S atoms, but GeS surface immediately degrades during Au etching in an oxidative KI/I2 solution. Although the surface of SnS after the Au-mediated exfoliation reveals several-nm oxide layer of SnOx, the surface morphology retains the flatness unlike the case of GeS. The SnS layers are more robust than GeS against the thermal annealing as well as the chemical treatment, suggesting that SnOx works as a passivation layer for SnS. Self-passivated SnS monolayer can be obtained by a controlled post-oxidation.

Novel fluorene/indole-based hole transport materials with high thermal stability for efficient OLEDs

2017 ◽  
Vol 137 ◽  
pp. 36-42 ◽  
Author(s):  
Ning Xiang ◽  
Zhixiang Gao ◽  
Guojian Tian ◽  
Yi Chen ◽  
Wenqing Liang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Hole Transport ◽  
High Thermal Stability

scholarly journals Enhanced Electrical Properties of Lead-Free Piezoelectric KNLN-BZ-BNT Ceramics With the Modification of Sm3+ Ions

2021 ◽  
Vol 8 ◽  
Author(s):  
Yi Quan ◽  
Lingyan Wang ◽  
Wei Ren ◽  
Jinyan Zhao ◽  
Jian Zhuang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Electrical Properties ◽  
Piezoelectric Properties ◽  
Piezoelectric Ceramics ◽  
High Thermal Stability ◽  
Lead Free ◽  
Environment Friendly ◽  
Good Thermal Stability ◽  
Good For

Environment-friendly lead-free piezoelectric ceramics with great properties and high thermal stability are desired in the industry. In this work, the Sm3+-modified lead-free 0.915(K0.45Na0.5Li0.05)NbO3–0.075BaZrO3–0.01(Bi0.5Na0.5)TiO3 (KNLN-BZ-BNT) ceramics are prepared. The piezoelectric properties are improved with the introduction of Sm3+, and the optimal properties (d33 = 325 pC/N and d33* = 384 pm/V) are achieved in the ceramic modified with 0.3 mol% Sm3+ ions. Meanwhile, this sample shows good thermal stability such that the values of d33* decreased less than 20% when the temperature raised from 30 to 180oC. These results show the Sm3+-modified KNLN-BZ-BNT ceramics are good for further applications even under high temperature.

Cyclic arylamines as hole transport materials with high thermal stability for efficient electroluminescence

2008 ◽  
Vol 516 (21) ◽  
pp. 7720-7726 ◽  
Author(s):  
Min Xu ◽  
Chun Yi ◽  
Chang-Jian Yang ◽  
Jiang-Huai Wang ◽  
Yan-Zhu Liu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Hole Transport ◽  
High Thermal Stability

POSS-benzocyclobutene (POSS-BCB) resin

2017 ◽  
Vol 30 (9) ◽  
pp. 1123-1129 ◽  
Author(s):  
Tao Su ◽  
Weiwei Men ◽  
Zhiqiang Wang ◽  
Lixin Xuan ◽  
Weiwei Zhao
Keyword(s):  
Thermal Stability ◽  
Ring Opening ◽  
High Thermal Stability ◽  
Dielectric Constants ◽  
Low Dielectric Constant ◽  
Good Thermal Stability ◽  
Low Dielectric ◽  
Ring Opening Reaction ◽  
Microelectronics Industry ◽  
Oligomeric Silsesquioxane

Organic-inorganic hybrid materials with a high thermal stability and a low dielectric constant show great potential in the microelectronics industry. In this work, polyhedral oligomeric silsesquioxane-benzocyclobutenes (POSS-BCBs) were synthesized by a hydrosilylation reaction of octavinyloctasilasesquioxane (OVPOSS) and 4-(1,1-dimethyl-1-hydro)-silyl-benzocyclobutene with H2PtCl6 as a catalyst. The ring-opening reaction of BCB on POSS-BCBs resulted in POSS-BCB resins with a highly cross-linked network structure. This resin exhibited good thermal stability (T5% is 495°C in N2), low dielectric constants (<2.1 at 20 MHz) and low water absorption.

A Carbazole-Based Conjugated Polymer Bearing Ruthenium Complexes, Synthesis and Preliminary Photovoltaic Study

2012 ◽  
Vol 159 ◽  
pp. 6-11 ◽  
Author(s):  
Yan Rong Wang ◽  
Hong Juan Zheng ◽  
Shen Gang Xu ◽  
Ya Ping Li ◽  
Shao Kui Cao
Keyword(s):  
Thermal Stability ◽  
Conjugated Polymer ◽  
Photovoltaic Cells ◽  
Ruthenium Complexes ◽  
Hole Transport ◽  
Good Thermal Stability ◽  
H Nmr ◽  
Chemical Structures ◽  
Polymer Bearing ◽  
Photovoltaic Behavior

A carbazole-based conjugated polymer bearing ruthenium complexes Pbpy(Ru)-Cz was synthesized aiming to obtain a material with dual functionalities of both light absorption and hole-transport for photovoltaic cells. Chemical structures of the monomers and polymers were confirmed by ¹H NMR, IR, and elemental analysis. Pbpy(Ru)-Cz showed good thermal stability and solubility. The absorption spectrum of Pbpy(Ru)-Cz showed a broader peak covering the wavelength range from 380 to 650 nm. Preliminary photovoltaic behavior was evaluated by fabricating photovoltaic cells. As measured under a 55 mW cm‾² compact white arc lamp, Voc, Jsc, FF and ηe of the device ITO/Pbpy(Ru)-Cz:PCBM/Al were 0.18 V, 0.019 mA cm‾², 0.22 and 1.40×10‾³%, pectively.

Synthesis and photoluminescence of green-emitting Ce3+,Tb3+ co-doped Al6Si2O13 phosphors with high thermal stability for white LEDs

RSC Advances ◽  
2016 ◽  
Vol 6 (49) ◽  
pp. 42770-42777 ◽  
Author(s):  
Gui-Gen Wang ◽  
Xiao-Fei Wang ◽  
Li-Wen Dong ◽  
Qi Yang
Keyword(s):  
Thermal Stability ◽  
High Temperature ◽  
Solid State ◽  
Solid State Reaction ◽  
Solid State Reaction Method ◽  
High Thermal Stability ◽  
Reaction Method ◽  
White Leds ◽  
Good Thermal Stability ◽  
Co Doped

In this article, novel green-emitting Ce3+, Tb3+ co-doped Al6Si2O13 phosphors with good thermal stability have been successfully prepared by high-temperature solid-state reaction method.

scholarly journals Ternary composites of linear and hyperbranched polyimides with nanoscale silica for low dielectric constant, high transparency, and high thermal stability

RSC Advances ◽  
2015 ◽  
Vol 5 (50) ◽  
pp. 40046-40054 ◽  
Author(s):  
Seongku Kim ◽  
Shinji Ando ◽  
Xiaogong Wang
Keyword(s):  
Thermal Stability ◽  
Dielectric Constant ◽  
Polymer Films ◽  
High Thermal Stability ◽  
Optical Transparency ◽  
Low Dielectric Constant ◽  
High Transparency ◽  
Good Thermal Stability ◽  
Low Dielectric ◽  
Hyperbranched Polyimides

A new series of ternary polyimide–silica composites was developed to obtain polymer films with low dielectric constant, high optical transparency, and good thermal stability.

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