BULLETIN OF THE KOREAN CHEMICAL SOCIETY
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2017
·Vol. 38
·期 7
·700-705
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IF 0.602
Sheng Wang,Yanbing Lv,Ruili Wu,Lin Song Li,Huaibin Shen,Ming Xing,Xia Chen
The high-quality green-emitting CdS 0 . 5 Se 0 .5 /8Zn 1 − x Cd x S/2ZnS QDs with “8” and “2” monolayers (ML) of corresponding shell were first synthesized by “thermal-cycling coupled single precursor” (TC-SP) approach. The component-gradient Zn 1− x Cd x S interlayer played a key role in the growth of thick shell by gradually buffering the large lattice mismatch (~9%) between the CdS 0 . 5 Se 0 .5 core and ZnS shell. Moreover, the Zn 1− x Cd x S gradient interlayer as well as ZnS outshell increased the potential barrier to prevent excitons from being trapped by surface defects. The photoluminescence quantum yields of the as-synthesized CdS 0 . 5 Se 0 .5 /8Zn 1 − x Cd x S/2ZnS core/shell QDs can reach to 70% in organic media and still maintain 60% after aqueous phase transfer. The green-emitting CdS 0 . 5 Se 0 .5 /8Zn 1 − x Cd x S/2ZnS core/shell QDs may be good candidates for applications of biomedical and photoelectric field.
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Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 12
·3035-3041
·
IF 5.256
Kaisi Liu,Bin Yao,Yongfeng Li,Zhanhui Ding,Hao Sun,Yuhong Jiang,Gang Wang,Daocheng Pan
Herein, we successfully prepared dithiocarbamate-based Cu2ZnSnS4 (CZTS) precursor solutions using various amino groups such as methylamine, ethylamine, propylamine, butylamine, amylamine, hexylamine, octylamine, and ethanolamine. These solutions exhibited a distinguishing wetting behavior, viscosity, and stability and could be used to fabricate CZTS thin films by a simple spin-coating and annealing process. We compared the thermogravimetric analysis of the precursor solutions and the XRD patterns of the as-prepared CZTS films and clear differences between the samples were observed. Furthermore, we fabricated high-quality CZTS films using the ethanoldithiocarbamate-based CZTS precursor solution, and the Cu2ZnSn(S,Se)4 solar cell with the best power conversion efficiency (7.66%) under 1.5 AM illumination was achieved.
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MATERIALS LETTERS
·
2015
·
IF 2.489
Tao Yang,Rui Wang,Xuqi Hou,Jue Cheng,Junying Zhang
A series of epoxy resins containing side aliphatic pendant chains (abbreviated as EP C-04 , EP C-08 , EP C-12 and EP C-18 ) were prepared by the reaction between the diglycidyl ether of bisphenol F (DGEBF) and the single-ended fatty amine with a chain length ranging from C4 to C18. Studies on the film morphology and the physical performance demonstrate that the cured EP C-04 , EP C-08 , EP C-12 and EP C-18 composites possess excellent mechanical and thermal properties, which are originated from the micro-, submicro- and nano-structured phases distributed in the epoxy matrix. In addition, by adjusting the lengths of the dangling aliphatic chains, the mechanical properties of the cured resins can be tuned in different scales. Consequently, by prolonging the pendant chain length to C18, the cured resin exhibits a striking tensile strength of 90.65 MPa, an elongation of 6.1% and a modulus of 2.55 GPa.
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EUROPEAN POLYMER JOURNAL
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2014
·
IF 3.242
Chanjuan Tan,Jun Peng,Weihong Lin,Yuxiu Xing,Kai Xu,Jiancheng Wu,Mingcai Chen
Cellulose nanocrystals (CNCs), surface-modified by grafting long alkyl chain amine onto carboxylated CNCs, have been applied as novel nanofillers to prepare nanocomposite films of poly(ethylene-co-vinylacetate) (EVA) through solution casting technique. The robust amide linkages imparted hydrophobicity to the nanocrystal surface and allowed for a better dispersion of CNCs within the EVA matrix. Atomic force microscopy (AFM) surface images and polarized optical micrographs showed that the nanocrystals were randomly oriented in the plane of the EVA film. To achieve the alignment of anisotropic nanofillers, we carried out mechanical shear experiments at an elevated temperature well above the glass-transition temperature of matrix polymer. Hot-pressing and hot-stretching resulted in preferential reorientation of nanocrystals, but not along the shear direction, which is related to the combined actions between the external tension and intermolecular interaction of amide-modified CNC during shear processing. As a result, external mechanical stress transferred from the matrix to the particles, leading to a preferential orientation of the latter. Mechanical and water vapor barrier properties were found to be drastically enhanced. The amide-based CNC/EVA showed high level of elongation at break (up to 85% retention of the initial values). These enhancements were tentatively attributed to the strong interaction occurring at the interface between CNC amide and the EVA polymer.
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THERMOCHIMICA ACTA
·
2017
·
IF 2.236
Bin Xu,Boyi Wang,Caixia Zhang,Jing Zhou
In this study, we adopted the organic precursor thermal decomposition method to prepare Cu 2 O-Cu-MWCNTs/paraffin light-thermal conversion phase change material via one-step. The phase, micro morphology, phase change behavior, thermal reliability and thermal stability of the products were respectively characterized by XRD, SEM, DSC and TGA. We also investigated their light-thermal conversion properties. The results indicated when the content of precursor was 0.005 mol and 0.01 mol, the average particles size of hybird particles (Cu and Cu 2 O) were 30 nm and 400 nm, respectively. It was also found that the light-heat conversion performance of Cu 2 O-Cu-MWCNTs/paraffin were better than that of MWCNTs/paraffin with the same mass fraction. After we conducted analyses of UV–vis diffuse reflection spectra and thermal conductivity, We attributed the better light-heat conversion performance of Cu 2 O-Cu-MWCNTs/paraffin to the high light absorption ability of Cu 2 O and the reduction of interface thermal resistance between MWCNTs and paraffinresulting from Cu and Cu 2 O decorated MWCNTs.
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CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Peng Zhang,Feiming Li,Shujuan Lin,Wen-Jie Chen,Dejian Chen
Lead halide perovskite nanocrystals (PNCs) have emerged as promising materials for photocatalysis due to their exceptional optoelectronic properties, yet achieving efficient charge separation and selective oxidation reactions remains a significant challenge. In this study, we report the synthesis of Fe 3+ -doped CsPbBr 3 /SiO 2 nanocomposites (Fe-PNCs/SNPs) with gradient energy levels, designed to enhance photocatalytic performance. Our results demonstrate that Fe 3+ doping introduces mid-gap states, promotes photoinduced charge separation, and generates reactive oxygen species (ROS) such as O 2 − and OH radicals under sunlight-simulating light irradiation from a 300 W Xe arc lamp. The Fe 20 -PNCs/SNPs catalyst achieved over 99 % conversion of benzyl alcohol to benzaldehyde with high selectivity and stability in the ethanol under ambient conditions. Additionally, the catalyst exhibited excellent recyclability and broad substrate tolerance. These findings highlight the innovative design of gradient energy levels in perovskite nanocomposites, offering a new strategy for enhancing photocatalytic efficiency in selective organic transformations.
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Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2025
·
IF 4.6
Shuang Xi,Xingwang Shen,Junjie Li
There are inevitable cracking defects in pressureless bonded joints with single nanoparticle system silver (Ag) pastes, which could potentially compromise the long-term service reliability of the bonded joints. To address this issue, a novel hybrid Ag paste suitable for pressureless sintering was developed by introducing micron Ag flakes into the modified Ag nanoparticles. The effects of process parameters, such as the mass ratio of Ag nanoparticles to micron-sized Ag flakes in the paste and the sintering time, on the electrical performance of the sintered films and the bonding performance of the joints were investigated. The mechanism of sintering reliability enhancement of micro-nano hybrid Ag paste was also investigated. After a long time of high-temperature aging, micro-nano hybrid Ag paste joints with optimized micro/nano ratio exhibit reduced surface defects (with porosity of 22.19 % for hybrid Ag paste joints while 28.67 % for nano-Ag paste joints), which contributes to the enhanced mechanical stability compared to nano-Ag paste bonded joints (with shear strength of 45.78 MPa for hybrid Ag paste joints while 33.38 MPa for nano-Ag paste joints). The obtained hybrid Ag paste with high mechanical service reliability and superior repeatability would find a broad application prospect in the field of power device packaging.
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ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Jianyong Pan,Jingyang Hu,Xinning Dong,Yuhui Wang,Xiaoyu Zhang,Martyn A. McLachlan,Zhongrui Wang,Jiaqi Zhang,Lijun Zhang
Memristors based on perovskite materials demonstrate significant potential for applications in information encryption and storage. However, the stability and durability of their device structures remain major challenges for commercial deployment. In this study, Mn:CsPbCl 3 perovskite nanocrystals capped with short-chain ligands are synthesized at a controlled ratio using an in situ ligand passivation strategy. Compared with long-chain ligands, short-chain ligands possess higher surface adsorption energy, which enhances nanocrystal size uniformity and enables more effective attachment to the perovskite surface at adsorption sites. This process mitigates surface defects in the nanocrystals, thereby decreasing the randomness in conductive filaments formation and enhancing device stability. Furthermore, short-chain ligand capping improves the contact at the material-electrode interface correspondingly reducing leakage current. The fabricated short-chain Al/Mn:CsPbCl 3 /FTO memristor exhibits good reconfigurable storage behavior. By adjusting the compliance current, a transition from non-volatile to volatile storage modes is successfully achieved. Leveraging the device's electrical characteristics, binary image encryption, and storage functions are realized. Overall, this work demonstrates the importance of surface defects on the operational stability of nanocrystal memristors and provides a foundation for the application of perovskite memristors in information encryption and secure transmission.
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ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
Zhi-Gang Wang,Yusi Hu,Hao-Yang Liu,Hai-Yan Wen,Bao-Ping Qi,Shu-Lin Liu
Electrochemiluminescence (ECL) imaging, a rapidly evolving technology, has attracted significant attention in the field of cellular imaging. However, its primary limitation lies in its inability to analyze the motion behaviors of individual particles in live cellular environments. In this study, we leveraged the exceptional ECL properties of quantum dots (QDs) and the excellent electrochemical properties of carbon dots (CDs) to develop a high-brightness ECL nanoprobe (CDs-QDs) for real-time ECL imaging between living cells. This nanoprobe has excellent signal-to-noise ratio imaging capabilities for the single-particle tracking (SPT) of biomolecules. Our finding elucidated the enhanced ECL mechanism of CDs-QDs in the presence of reactive oxygen species through photoluminescence, electrochemistry, and ECL techniques. We further tracked the movement of single particles on membrane nanotubes between live cells and confirmed that the ECL-based SPT technique using CD-QD nanoparticles is an effective approach for monitoring the transport behaviors of biomolecules on membrane nanotubes between live cells. This opens a promising avenue for the advancement of ECL-based single-particle detection and the dynamic quantitative imaging of biomolecules.
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PubMed
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JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Yunhui Li,Yixiong Chen,Jialin Qing,Zuoying Cao,Shengxi Wu,Qinggang Li,Mingyu Wang,Wenjuan Guan,Guiqing Zhang
The efficient recovery of nickel from chloride systems has long presented a challenge in the field. While solvent extraction is a viable approach, conventional extractants have been associated with drawbacks such as a high requirement for chloride ions and substantial consumption of acids and alkalis. In response to these challenges, this investigation developed and synthesized a novel thiazole-based extractant, N, N-Bis(4-thiazolylmethyl)octylamine (NNBT), tailored for the selective extraction of nickel from chloride systems. Findings from the study indicate that the nitrogen atom situated on the benzylamine framework within NNBT can interact synergistically with the chelating thiazole ring, facilitating effective nickel extraction and notably reducing the need for chloride ions. Furthermore, the extractant can be regenerated using deionized water , thereby obviating the necessity for additional consumption of acids and alkalis. Following the validation of NNBT as an environmentally sustainable and efficient nickel extractant within the chloride ion system, it was successfully employed to selectively and effectively extract nickel from the nickel-aluminum slag of spent HDP catalyst. The extracted nickel and aluminum were subsequently processed into electroplated nickel chloride and polyaluminum chloride, respectively, meeting the national standards of China. These outcomes underscore the eco-friendliness and promise of NNBT for nickel extraction from chloride systems.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Donggang Tao,Ting Li,Yudi Tang,Hongda Gui,Yuliang Cao,Fei Xu
Rechargeable Mg batteries are an advantageous energy-storage technology with low cost and high safety, but the design of high-performance cathode materials is currently the major difficulty. Herein, a new cathode material of Cu 3 VSe 4 is fabricated with a comprehensive consideration of the chemical and electronic structures. The intermediate band semiconductor Cu 3 VSe 4 has a cubic crystal structure containing interlaced 3D tunnels. The V and Se atoms form chemical bonds with high covalent proportions and facilitate the charge delocalization via the V‒Se bonds. Because of these features, Cu 3 VSe 4 provides a high capacity of 251 mAh g ‒1 with co-redox of Cu, V, and Se elements and an outstanding rate performance of 44 mAh g ‒1 at 15 A g ‒1 . Prominently, a high mass load of 3.0 mg cm ‒2 is achieved without obvious rate capability decay, which is quite favorable to pair with the high-capacity Mg metal anode in practical application. The mechanism investigation and theoretical computation demonstrate that Cu 3 VSe 4 undergoes first a Mg-intercalation and then a displacement reaction, during which the crystal structure is maintained, assisting the reaction reversibility and cycling stability. These findings reveal a rational design principle of rechargeable Mg battery cathodes based on a comprehensive consideration of chemical and electronic structures.
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MOLECULES
·
2024
·Vol. 29
·期 14
·3307
·
IF 4.2
Yingbiao Xu,Li Cheng,Yefei Wang,Han Jia
Nanoparticles have been widely applied to treat emulsion-containing wastewater in the form of chemical demulsifiers, such as SiO2, Fe3O4, and graphene oxide (GO). Owing to their asymmetric structures and selective adsorption, Janus nanoparticles show greater application potential in many fields. In the present work, the novel magnetic Janus graphene oxide (MJGO) nanoparticle was successfully prepared by grafting magnetic Fe3O4to the surface of the JGO, and its demulsifying ability to treat a crude oil-in-water emulsion was evaluated. The MJGO structure and its magnetic intensity were verified by Fourier-transform infrared spectra (FTIR), transmission electron microscopy (TEM), X-ray diffraction (XRD), and magnetization saturation (MS) tests. Compared with GO and JGO, MJGO displayed the superior efficiency (>96%) to demulsify the crude oil-in-water emulsion, which can be attributed to the reduced electrostatic repulsion between MJGO and the emulsion droplets. Furthermore, the effects of pH and temperature on the demulsification performance of MJGO were also studied. Lastly, the recyclability of MJGO largely reduced the cost of demulsifiers in separating crude oil and water. The current research presents an efficient and recyclable demulsifier, which provides a new perspective for the structural design of nanomaterials and their application in the field of demulsification.
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