Synthesis and Characterization of Copper(I) Amidinates as Precursors for Atomic Layer Deposition (ALD) of Copper Metal

A series of copper(I) amidinates of the general type [(R‘NC(R)NR‘ ‘)Cu]2 (R‘ and R‘ ‘ = n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl; R = methyl, n-butyl) have been synthesized and characterized. These compounds are planar dimers, bridged by nearly linear N−Cu−N bonds. Their properties (volatility, low melting point, high thermal stability, and self-limited surface reactivity) are well-suited for atomic layer deposition (ALD) of copper metal films that are pure, highly conductive, conformal, and strongly adherent to substrates

Synthesis and Characterization of Copper(I) Amidinates as Precursors for Atomic Layer Deposition (ALD) of Copper Metal

A series of copper(I) amidinates of the general type [(R‘NC(R)NR‘ ‘)Cu]2 (R‘ and R‘ ‘ = n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, tert-butyl; R = methyl, n-butyl) have been synthesized and characterized. These compounds are planar dimers, bridged by nearly linear N−Cu−N bonds. Their properties (volatility, low melting point, high thermal stability, and self-limited surface reactivity) are well-suited for atomic layer deposition (ALD) of copper metal films that are pure, highly conductive, conformal, and strongly adherent to substrates

Optimization of Zn_<i>x</i>Fe_3–<i>x</i>O₄ Hollow Spheres for Enhanced Microwave Attenuation

We report here the composition optimization of Zn_<i>x</i>Fe_3–<i>x</i>O₄ hollow nanospheres for enhancing microwave attenuation. Zn_<i>x</i>Fe_3–<i>x</i>O₄ hollow nanospheres were synthesized through a simple solvothermal process. The maximum magnetization moment of 91.9 emu/g can be obtained at <i>x</i> = 0.6. The composite filled with Zn_0.6Fe_2.4O₄ exhibited the bandwidth of 3.21–8.33 GHz for RL < −10 dB and a maximum relative bandwidth (<i>W</i>_p,max) of 88.6% at optimized thickness <i>t</i>₀ = 0.34 cm. The enhancement should be attributed to the enhanced permeability resonance at high frequency. This optimized hollow material is very promising to be used as a mass efficient and broadband microwave attenuation material

Terrace-Rich Ultrathin PtCu Surface on Earth-Abundant Metal for Oxygen Reduction Reaction

The activity and stability of the platinum electrode toward the oxygen reduction reaction are size-dependent. Although small nanoparticles have high Pt utilization, the undercoordinated Pt sites on their surface are assumed to have too strong oxygen binding strength, thus often leading to compromised activity and surface instability. Herein, we report an extended nanostructured PtCu ultrathin surface to reduce the number of low-coordination sites without sacrificing the electrochemical active surface area (ECSA). The surface shows (111)-oriented characteristics, as proven by electrochemical probe reactions and spectroscopies. The PtCu surface brings over an order of magnitude increase in specific activity relative to commercial Pt/C and nearly 4-fold enhancement in ECSA compared to traditional thin films. Moreover, due to the weak absorption of air impurities (e.g., SO2, NO, CO) on highly coordinated sites, the catalyst displays enhanced contaminant tolerance compared with nanoparticulate Pt/C. This work promises a broad screening of extended nanostructured surface catalysts for electrochemical conversions

Defect-Driven Efficient Selective CO₂ Hydrogenation with Mo-Based Clusters

Synthetic fuels produced from CO2 show promise in combating climate change. The reverse water gas shift (RWGS) reaction is the key to opening the CO2 molecule, and CO serves as a versatile intermediate for creating various hydrocarbons. Mo-based catalysts are of great interest for RWGS reactions featured for their stability and strong metal–oxygen interactions. Our study identified Mo defects as the intrinsic origin of the high activity of cluster Mo2C for CO2-selective hydrogenation. Specifically, we found that defected Mo2C clusters supported on nitrogen-doped graphene exhibited exceptional catalytic performance, attaining a reaction rate of 6.3 gCO/gcat/h at 400 °C with over 99% CO selectivity and good stability. Such a catalyst outperformed other Mo-based catalysts and noble metal-based catalysts in terms of facile dissociation of CO2, highly selective hydrogenation, and nonbarrier liberation of CO. Our study revealed that as a potential descriptor, the atomic magnetism linearly correlates to the liberation capacity of CO, and Mo defects facilitated product desorption by reducing the magnetization of the adsorption site. On the other hand, the defects were effective in neutralizing the negative charges of surface hydrogen, which is crucial for selective hydrogenation. Finally, we have successfully demonstrated that the combination of a carbon support and the carbonization process synergistically serves as a feasible strategy for creating rich Mo defects, and biochar can be a low-cost alternative option for large-scale applications

sj-pdf-1-het-10.1177_09603271211069038 – Supplemental Material for A comprehensive gene expression profile of allergic rhinitis-derived nasal fibroblasts and the potential mechanism for its phenotype

Supplemental Material, sj-pdf-1-het-10.1177_09603271211069038 for A comprehensive gene expression profile of allergic rhinitis-derived nasal fibroblasts and the potential mechanism for its phenotype by Zhengwen Li, Wentao Zou, Jingwen Sun, Shuang Zhou, Yue Zhou, Xiaojing Cai and Jiaxiong Zhang in Human & Experimental Toxicology</p

sj-pdf-2-het-10.1177_09603271211069038 – Supplemental Material for A comprehensive gene expression profile of allergic rhinitis-derived nasal fibroblasts and the potential mechanism for its phenotype

Supplemental Material, sj-pdf-2-het-10.1177_09603271211069038 for A comprehensive gene expression profile of allergic rhinitis-derived nasal fibroblasts and the potential mechanism for its phenotype by Zhengwen Li, Wentao Zou, Jingwen Sun, Shuang Zhou, Yue Zhou, Xiaojing Cai and Jiaxiong Zhang in Human & Experimental Toxicology</p

sj-pdf-3-het-10.1177_09603271211069038 – Supplemental Material for A comprehensive gene expression profile of allergic rhinitis-derived nasal fibroblasts and the potential mechanism for its phenotype

Supplemental Material, sj-pdf-3-het-10.1177_09603271211069038 for A comprehensive gene expression profile of allergic rhinitis-derived nasal fibroblasts and the potential mechanism for its phenotype by Zhengwen Li, Wentao Zou, Jingwen Sun, Shuang Zhou, Yue Zhou, Xiaojing Cai and Jiaxiong Zhang in Human & Experimental Toxicology</p

Optimized Interface Structure of Degradable Epoxy Composites Based on the Self-Assembly of Lignin-Graphite for Thermal Management Application

Enhancing the interface compatibility between the polymer matrix and filler is still a hotspot issue for the fabrication of thermal management materials. In this work, biomass lignin was used innovatively as coupling reagents to optimize the interface microstructure of the matrix/filler. The as-prepared lignin-graphite (AL@GP) and epoxy resin with a Schiff base structure (PBD-EP) were employed as functionalized filler and polymer matrix, respectively. And a degradable and thermally conductive epoxy composite was prepared through the hot-press technique. Experimental and theoretical calculations results based on the first principles demonstrated enhanced interface bonding between GP and PBD-EP. Besides, the developed polymeric composites exhibited excellent thermal conductivity (2.852 W m–1 K–1) when loaded with 50 wt % AL@GP, increasing by 26.1% compared with the PBD-EP/GP system. Moreover, it presented a reduced interface thermal resistance (0.10745 m2 K W–1) and superior solvent-free green degradability. LED heat dissipation experiments indicated the potential of as-prepared composites for thermal management applications. This work not only provides a novel and facile filler functionalization strategy for improving the interfacial interaction of the matrix/filler but also promotes the high-value applications of biomass lignin

Dual Functionalized Interstitial N Atoms in Co₃Mo₃N Enabling CO₂ Activation

The introduction of light elements into the interstitial sites of metals can significantly modify their surface structure and electronic properties and thus enhance the catalytic performance. However, it is still unclear how the interstitial light elements promote the catalytic activity. Herein, N atoms are incorporated into the bimetallic CoMo system to synthesize Co3Mo3N as an efficient catalyst for reverse water–gas shift (RWGS) reaction. Compared to CoMo, Co3Mo3N significantly promotes the catalytic performance, where the removal of O-containing intermediates is identified as the rate-determining step. The enhanced activity is attributed to the dual functions of interstitial N atoms in Co3Mo3N, which provide additional sites for supplying H atoms to facilitate the hydrogenation of O-containing intermediates and accept electrons from Mo to weaken the binding ability of Mo to O-containing intermediates. These dual functionalized interstitial N atoms promote the redox cycle during the RWGS process and thus improve the catalytic performance. Our work provides an understanding of the interstitial light element-promoted catalytic performance relationship