Topic
Chemical binding
About: Chemical binding is a research topic. Over the lifetime, 1822 publications have been published within this topic receiving 52516 citations.
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TL;DR: In this paper, size-dependent surface binding forms of the carboxylic group on the surface of TiO2 nanoparticles were investigated by a surface-binding transient probe molecule all-trans-retinoic acid (ATRA), where the excited triplet-state probe molecule generated by a photoinduced interfacial charge recombination for the adsorbed monolayer acts as a reporter for the different surfacebinding forms.
Abstract: Size-dependent surface binding forms of the carboxylic group on the surface of TiO2 nanoparticles were investigated by a surface-binding transient probe molecule all-trans-retinoic acid (ATRA), where the excited triplet-state probe molecule generated by a photoinduced interfacial charge recombination for the adsorbed monolayer acts as a reporter for the different surface binding forms. Different TiO2 nanoparticles of varying sizethat is, 6, 0.8−1.4, and 0.7 nmwere prepared, and their physical properties were examined by X-ray diffraction (XRD), transmission electron microscopy (TEM), selected-area electron diffraction (SAED), and X-ray photoelectron spectroscopy (XPS). The transient absorbance difference spectra of the ATRA/TiO2 reveal that, when the size changes from 6 nm to <1.4 nm, the simple adsorption forms (physical adsorption and hydrogen bonding form) decrease from 36% to 3%, whereas chemical binding forms increase from 74% to 97%. Such a size-dependent effect is attributed to the variation in the...
89 citations
TL;DR: In this article, high-porosity and high-surface area (∼ 1000 m2/g), thermally stable (1200 K) crystalline films of MgO are synthesized using a novel reactive ballistic deposition technique.
Abstract: Highly porous (∼ 90%), high-surface area (∼1000 m2/g), thermally stable (1200 K) crystalline films of MgO are synthesized using a novel reactive ballistic deposition technique. The film consists of a tilted array of porous nanoscale crystalline filaments. Surprisingly, the individual filaments exhibit a high degree of crystallographic order with respect to each other. These films have chemical binding sites analogous to those on MgO(100). However, the fraction of chemically active, high energy binding sites is greatly enhanced on the nanoporous film. This unique collection of properties makes these materials attractive candidates for chemical applications such as sensors and heterogeneous catalysts.
89 citations
TL;DR: In this paper, a 3D hierarchical hierarchical COF superstructures comprising porphyrin-rich conjugated ultrathin nanosheets were synthesized for Li-S batteries.
89 citations
TL;DR: It is reported that the necessary coalignment of the nucleating graphene islands on Ge(110) surface is caused by the presence of step-pattern, and it is shown that on the preannealed Ge (110) textureless surface the graphene islands appear nonpreferentially orientated, while on the Ge( 110) surfaces with natural step pattern, all graphene islands emerge coaligned.
Abstract: The unidirectional alignment of graphene islands is essential to the synthesis of wafer-scale single-crystal graphene on Ge(110) surface, but the underlying mechanism is not well-understood. Here we report that the necessary coalignment of the nucleating graphene islands on Ge(110) surface is caused by the presence of step-pattern; we show that on the preannealed Ge(110) textureless surface the graphene islands appear nonpreferentially orientated, while on the Ge(110) surfaces with natural step pattern, all graphene islands emerge coaligned. First-principles calculations and theoretical analysis reveal this different alignment behaviors originate from the strong chemical binding formed between the graphene island edges and the atomic steps on the Ge(110) surface, and the lattice matching at edge-step interface dictates the alignment of graphene islands with the armchair direction of graphene along the [-110] direction of the Ge(110) substrate.
88 citations
TL;DR: In this article, the authors focused on the oxygen permeability of SiOx thin films on polyethyleneterephtalate (PET) produced by plasmaenhanced chemical vapor deposition (PECVD) from oxygen-diluted hexamethyldisiloxane (HMDSO).
Abstract: This study focuses on the oxygen permeability of SiOx thin films on polyethyleneterephtalate (PET) produced by plasma-enhanced chemical vapor deposition (PECVD) from oxygen-diluted hexamethyldisiloxane (HMDSO). The versatile PECVD set-up, equipped with two plasma sources (remote microwave and direct radio frequency), allows the deposition of films with variable morphologies and compositions. The deposits were analyzed by XPS, ellipsometry, and atomic force microscopy (AFM). Curve fitting of the Si 2p peak in X-ray photoelectron spectra (XPS) provided information about the chemical binding states of the silicon atoms. The results clearly show that the oxygen transmission rate (OTR) depends highly on the film structure, whereas the chemical composition has only little effect. In order to achieve the desired dense and smooth film structure, it is necessary to have a high substrate bias, which promotes ion bombardment of the film surface during growth. OTR values down to 0.2 cm3 (STP) m− 2 day− 1, corresponding to a barrier improvement factor of 500, have been achieved.
87 citations