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Thermal stability
About: Thermal stability is a research topic. Over the lifetime, 38907 publications have been published within this topic receiving 767839 citations.
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TL;DR: In this article, the thermal stability and reducibility of oxygen-containing functional groups on the surface of nitric acid-treated multiwalled carbon nanotubes (CNTs) have been studied using temperature-programmed desorption and reduction (TPD and TPR) and high-resolution X-ray photoelectron spectroscopy (XPS).
Abstract: The thermal stability and the reducibility of oxygen-containing functional groups on the surface of nitric acid-treated multiwalled carbon nanotubes (CNTs) have been studied using temperature-programmed desorption and reduction (TPD and TPR) and high-resolution X-ray photoelectron spectroscopy (XPS). The thermal treatments up to 720 °C were carried out in the XPS setup, either under ultrahigh vacuum (UHV) or in diluted hydrogen. Deconvoluted XP spectra were used for the quantitative determination of the amount of the different functional groups on the CNT surfaces as a function of the pretreatment. The number of the oxygen atoms per unit surface area was obtained from the oxygen to carbon (O/C) ratio derived from the corresponding peak areas in the XP spectra. The results obtained by XPS agree quantitatively with the observations by TPD and TPR. The acid treatment not only introduced carboxyl, carbonyl, and phenol groups on the surface but also generated ether-type oxygen groups between the graphitic laye...
791 citations
TL;DR: In this paper, a direct comparison between perovskite-structured hybrid organic-inorganic methylammonium lead bromide (MAPbBr3) and cesium-lead bromides (CsPbB3) was performed over mesoporous titania scaffolds.
Abstract: Direct comparison between perovskite-structured hybrid organic–inorganic methylammonium lead bromide (MAPbBr3) and all-inorganic cesium lead bromide (CsPbBr3), allows identifying possible fundamental differences in their structural, thermal and electronic characteristics. Both materials possess a similar direct optical band gap, but CsPbBr3 demonstrates a higher thermal stability than MAPbBr3. In order to compare device properties, we fabricated solar cells, with similarly synthesized MAPbBr3 or CsPbBr3, over mesoporous titania scaffolds. Both cell types demonstrated comparable photovoltaic performances under AM1.5 illumination, reaching power conversion efficiencies of ∼6% with a poly aryl amine-based derivative as hole transport material. Further analysis shows that Cs-based devices are as efficient as, and more stable than methylammonium-based ones, after aging (storing the cells for 2 weeks in a dry (relative humidity 15–20%) air atmosphere in the dark) for 2 weeks, under constant illumination (at max...
773 citations
TL;DR: In this article, single wall carbon nanotube reinforced polyimide nanocomposites were synthesized by in situ polymerization of monomers of interest in the presence of sonication.
764 citations
TL;DR: In this paper, spectrophotometric and thermogravimetric studies of chitosan (CH) blends with polyvinyl alcohol (PVAL), starch (S) and hydroxypropylcellulose (HPC) obtained by casting from solutions in the form of transparent films containing 0.1.0 weight fraction of CH were discussed.
738 citations
TL;DR: Three-dimensional porous crystalline polyimide covalent organic frameworks (termed PI-COFs) have been synthesized and show high thermal stability and surface area and high loading and good release control for drug delivery applications.
Abstract: Three-dimensional porous crystalline polyimide covalent organic frameworks (termed PI-COFs) have been synthesized. These PI-COFs feature non- or interpenetrated structures that can be obtained by choosing tetrahedral building units of different sizes. Both PI-COFs show high thermal stability (>450 °C) and surface area (up to 2403 m2 g–1). They also show high loading and good release control for drug delivery applications.
730 citations