Novel Eu8In17.33S34 (1) is obtained by a solid state reaction and its structure features three parallel slabs of In9.33S18∞, Eu8∞, and In8S16∞, together with defects in specific lattice sites. It is ...the first monoclinic ternary M 8‑m In18‑n Q 34 (M = Pb, Sn, Eu; Q = S, Se) phase member, and the modulation from the ultralong In–S bond and lattice site with strong antibonding effect results in the unique structure feature. Its single crystals show anisotropic conductivity and photoconductivity.
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Precise control over the composition, morphology, and size of porphyrin-based metal–organic frameworks is challenging, but the extension of these hybrid materials will enable the creation of novel ...electrochemiluminescence (ECL) emitters. The coordination of various entities is made from Zn2+ ions and meso-tetra(4-carboxyphenyl)porphine (TCPP), modulated by both solvent and bathophenanthrolinedisulfonic acid disodium salt (BPS) as capping agent, resulting in limited crystal growth of Zn-TCPP in DMF/H2O (v/v, 1:1) and the formation of nanoscale TCPP-Zn-BPS. The role of BPS is also evaluated using Zn-TCPP and BPS-Zn-TCPP as controls, prepared in the absence of BPS and different coordinating sequences of ligands, respectively. The newly obtained TCPP-Zn-BPS exhibits a variety of different morphologies, as well as spectral and optoelectronic properties. The ECL behavior of TCPP-Zn-BPS is investigated by using H2O2 as co-reactant. The amplification of ECL is further studied by ECL spectroscopies and cyclic voltammetry, with the corresponding mechanism proposed.
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Electrically conductive elastomer composites (CECs) show potential applications in wearable strain sensing. However, it remains a great challenge to develop a facile and versatile method to prepare ...multifunctional CEC strain sensors integrating superhydrophobicity, high electrical conductivity, strong interfacial adhesion, and excellent durability. Inspired by the surface superhydrophobicity of taro leaves, herein, a highly conductive and fluorine-free superhydrophobic CEC is fabricated by a novel “ion reduction and simultaneous molecule phase separation” method. Octadecanoic acid (OCA) with low surface energy can not only impart the CEC with superhydrophobic property and corrosive resistance but also greatly enhance the interfacial interaction between AgNPs. The obtained CEC shows high conductivity (21.9 S/cm) and superhydrophobicity (with a contact angle of 152.6°). The superhydrophobic CEC with excellent corrosion resistance can be used as strain sensors and shows large working strain and sensitivity (with a gauge factor of 61.8 at the strain range of 80–120%) and excellent cycle stability. Also, it can detect human motions in both ambient and underwater conditions, showing promising applications in underwater wearable electronics.
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Recently, it has been reported that the enstatite chondrite (EC) meteorite may contain enough hydrogen to provide a plausible explanation for water’s initial existence on Earth. Perryite mineral is ...one of the key components of EC, but its detailed chemical composition and phase width remain elusive compared with other minerals found in EC. Therefore, we embark on a series of investigations of the synthesis, crystal structure, and electronic structure of the synthetic perryite mineral (Ni x Fe1–x )8(T y P1–y )3 (T = Si and Ge; 1 ≥ x, y ≥ 0). Its crystal structures were established based on single-crystal and powder X-ray diffraction techniques. It is realized that its structural and phase stabilities are highly dependent on the nature of the doping element (i.e., Fe and Si). The inclusion of Si and Fe elements can greatly alter the bonding scheme near the Fermi level (E f), which is vital to the phase stability and accounts for the chemical composition of the natural perryite mineral (quaternary compound) in EC meteorites. Furthermore, this phase exhibits good electrocatalytic activity toward the hydrogen evolution reaction (HER). The best and the worst HER performances are for the Ni8Ge2P and Ni8Si2P samples, respectively, which suggests that the long bond length and high polarity of the covalent bond are the preferred criteria to enhance the electrocatalytic HER in this series.
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In this work, colloidal laponite nanoparticles were further expanded into the design of the third-generation biosensor. Direct electrochemistry of the complex molybdoenzyme xanthine oxidase (XnOx) ...immobilized on glassy carbon electrode (GCE) by laponite nanoparticles was investigated for the first time. XnOx/laponite thin film modified electrode showed only one pair of well defined and reversible cyclic voltammetric peaks attributed to XnOx–FAD cofactor at about −0.370
V vs. SCE (pH 5). The formal potential of XnOx–FAD/FADH
2 couple varied linearly with the increase of pH in the range of 4.0–8.0 with a slope of −54.3
mV
pH
−1, which indicated that two-proton transfer was accompanied with two-electron transfer in the electrochemical reaction. More interestingly, the immobilized XnOx retained its biological activity well and displayed an excellent electrocatalytic performance to both the oxidation of xanthine and the reduction of nitrate. The electrocatalytic response showed a linear dependence on the xanthine concentration ranging from 3.9
×
10
−8 to 2.1
×
10
−5
M with a detection limit of 1.0
×
10
−8
M based on S/N
=
3.
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Reported are the synthesis and structural characterization of a new series of ternary rare-earth mix-chalcogenides RE4S4Te3 (RE = Gd, Ho, Er, Tm) that have been obtained from high-temperature solid ...state reactions. These compounds crystallize in Ho4S4Te2.68 structure types with monoclinic C2/m and/or orthorhombic Immm space groups. The space group variation within this series is due to the position disorder along the Te plane (Te to TeA and TeB). The structural relationship and change between these two space groups are analyzed. It is realized that these compounds are all photocatalytic active under simulated sunlight. The trend of their photocatalytic activities and photocurrent responses is well-explained by using theoretical calculation as well as dipole moment analysis.
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The electrocatalytic hydrogen evolution reaction (HER) requires high-performance catalysts, wherein both the valence state and the reaction microenvironment of the catalytic metal centers play a ...crucial role in the electrocatalytic activity. Herein, we demonstrate a surface modification strategy using a library of amino acid molecules to noncovalently link on cobalt phosphide (AA-CoP). We hypothesize that in amino acid molecules, the electron-donating functional group on the side chain tailors the valence state of Co centers, and the proton donor/acceptor groups can serve as a proton accumulator between the bulk electrolyte and catalyst surface via a hydrogen-bonding network, inducing a local proton-enriched environment on the electron-rich Co centers for electrocatalytic HER. We further propose a descriptor (φ), expressed as Q N × N H × V –1, to describe the geometric and electronic features of the amino acid molecules, which intrinsically quantifies their effect on metal centers for HER. In the volcanic relationship between this descriptor and HER activity based on the evaluation of 7 kinds of amino acid, asparagine-modified CoP (Asn-CoP) locates nearest to the summit, with only 112 mV to achieve 100 mA cm–2, which can be attributed to the sufficiently negative Co sites that are favorable to form the Co–H intermediate and to the hydrogen-bonding network-based microenvironment that supplies protons for HER.
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Nonlinear Optics. SnI4⋅(S8)2, obtained by S.‐P. Guo and co‐workers in their Communication on page 11540 ff. has a phase‐matchable character and wide IR transparency making it a very promising IR ...nonlinear optical (NLO) crystal.
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A simple adduct from tin tetraiodide SnI
and octasulfur S
, SnI
⋅(S
)
(1), is obtained employing a facile reaction. The combination of Sn
ions with d
electron configuration, acentric SnI
tetrahedra, ...and lone-pair effects of S
, makes 1 a phase-matchable infrared NLO crystal with a moderate second-harmonic generation (SHG) response and a very high laser-induced damage threshold (LIDT), which is well confirmed by the DFT calculations.
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A noncentrosymmetric adduct, SbI3·(S8)3, is obtained by a facile solution method. It crystallizes in the trigonal space group R3m, and its structure features van der Waals force connected, isolated ...trigonal-pyramidal SbI3 and chairlike S8 units. SbI3·(S8)3 exhibits strong second-harmonic-generation responses around 4 times that of KH2PO4 (1.064 μm) and 1 times that of AgGaS2 (AGS; 2.1 μm) at 210–250 μm, respectively. Under both laser-radiation wavelengths, it exhibits type I phase-matching behavior. Its laser-induced damage threshold is measured to be around 26 times that of AGS under 1.064 μm. To better understand these optical data, theoretical calculations are performed to address its electronic structure and optical properties.
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