Small
·
2024
·Vol. 20
·期 45
·2403852
·
IF 13
Xinxin Wang,Chao Wang,Yajing Wang,Min Hao,Shengqiang Cui,Xudong Huang,Chunhui Wang,Jing Chen,Zhenxiang Cheng,Jianli Wang
N-type PbSe thermoelectric materials encounter challenges in improving the power factor due to the single-band structure near the Fermi level, which obstructs typical band convergence. The primary strategy for enhancing the thermoelectric figure of merit (ZT) for n-type PbSe involves reducing lattice thermal conductivity (κ lat ) by introducing various defect structures. However, lattice mismatches resulting from internal defects within the matrix can diminish carrier mobility, thereby affecting electrical transport properties. In this study, n-type AgCuTe-alloyed PbSe systems achieve a peak ZT value of ≈1.5 at 773 K. Transmission electron microscopy reveals nanoprecipitates of Ag 2 Te, the room temperature second phase of AgCuTe, within the PbSe matrix. Meanwhile, a unique semi-coherent phase boundary is observed between the PbSe matrix and the Ag 2 Te nanoprecipitates. This semi-coherent phase interface effectively scatters low-frequency phonons while minimizing damage to carrier mobility. Additionally, the dynamic doping effect of Cu atoms from the decomposition of AgCuTe within the matrix further optimize the high-temperature thermoelectric performance. Overall, these factors significantly enhance the ZT across the whole temperature range. The ZT value of ≈1.5 indicates high competitiveness compared to the latest reported n-type PbSe materials, suggesting that these findings hold promise for advancing the development of efficient thermoelectric systems.
研究领域:
材料科学
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凝聚态物理
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能源材料
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纳米结构工程
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热电转换
✓ 已验证
DOI
高影响因子
Nanoscale Research Letters
·
2020
·Vol. 15
·期 1
·1-10
·
IF 3.578
Wang Shan,Fu Jing,Zhang Fang,Huan Ruirui,Liu Ting,Zeng Xingguo
Abstract A 0D/2D (0-dimensional/2-dimensional) nanostructure was designed by self-assembly of N–C QDs and carboxylated g-C 3 N 4 nanosheets and used as a fluorescence resonance energy transfer (FRET) fluorescent sensor. The N–C QDs/g-C 3 N 4 nanosheets were synthesized via the amino group on the N–C QD surface and the –COOH of the carboxylated g-C 3 N 4 nanosheets. The mechanism of detection of metronidazole (MNZ) by N–C QDs/g-C 3 N 4 nanocomposites is based on FRET between negatively charged N–QDs and positively charged carboxylated g-C 3 N 4 nanoparticles. N–C QDs/g-C 3 N 4 nanostructures displayed good responses for the detection of MNZ at normal temperature and pressure. The decrease in the fluorescence intensity showed a good linear relationship to MNZ concentration within 0–2.6 × 10 −5 mol/L, and the detection limit was 0.66 μM. The novel FRET sensor will have a great potential in clinical analysis and biological studies. Graphical Abstract
研究领域:
分析化学
·
生物医学
✓ 已验证
DOI
PubMed
高影响因子
SYNTHETIC METALS
·
2020
·
IF 3.286
Yifeng Shen,Chenghao Li,Yuping Wang,Cailin Liu,Xianyan Ren
Poly (N-vinyl carbazole) functionalized carbon dots (PVK-CDots) exhibiting significant photoinduced redox properties show great potential to be applied in opto-electro devices and systems. Here, we further make sure the PVK-CDots are promising candidates for developing solar cells after we designed a “one-pot” procedure to prepare PVK-CDots nanocomposites with high carbon content. The “one-pot” procedure is such that when citric acid is thermally carbonized into a carbon core, the N-vinyl carbazole is thermally initiated in situ to polymerize on the surface of the carbon core as passivation layer. The prepared PVK-CDots containing very high carbon content (about 36 %) are strongly absorptive and therefore effective in photon harvesting and also brightly fluorescent across the visible spectral region, which as expected exhibits significant photoinduced redox properties. Taking perovskite solar cell as an example, the PVK-CDots are qualified to act as a hole transport layer (HTL) material according to the alignment of energy levels.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2022
·Vol. 12
·期 18
·5549-5558
·
IF 6.177
Xiaomei Lu,Jingzhong Qin,Chensheng Xian,Jiabao Nie,Xun Li,Jie He,Bing Liu
A catalytic transfer hydrogenation reaction between nitroarenes and saturated N-heterocycles to simultaneously synthesize value-added anilines and unsaturated N-heterocycles is attractive due to its low-cost, atom economic, and environmental-friendly properties. Herein, we report cobalt-based catalysts prepared via a simple pyrolysis method, namely cobalt nanoparticles supported on microporous nitrogen-doped carbon (Co/mNC). The optimized catalyst (Co/mNC-500) showed excellent performance towards the catalytic transfer hydrogenation reaction between nitrobenzene and 1,2,3,4-tetrahydroquinoline, yielding more than 90% aniline and quinoline after a 24 hour reaction. Moreover, this catalytic system was available to a wide scope of substrates, and thus a variety of anilines as well as quinolines, isoquinolines, and indoles could be synthesized in great yields. Characterization and control experiments revealed that Co nanoparticles (Co NPs) were the dominant cobalt species evenly distributed on the microporous nitrogen-doped carbon support, serving as the reaction active centres. Based on the experimental results, a plausible reaction mechanism was proposed, in which Co NPs played an essential hydrogen abstraction and delivery role during the catalytic transfer hydrogenation process.
研究领域:
化学
·
材料科学
·
催化反应
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 46
·17033-17038
·
IF 4.174
Weichi Liang,Jiali Wen,Yukai Zhao,Meng Zhang,Jiuxing Jiang
A layered aluminophosphate |C14H11NO|2[Al4(HPO4)4F4(H2O)2] (denoted as SYSU-2) with a new topology has been hydrothermally synthesized with N-methyl-9-acridone (NMA) as the organic structure-directing agent. Single-crystal X-ray diffraction analysis reveals that SYSU-2 crystallizes in a triclinic space group P, with the inorganic sheets stacked in an AA sequence. Hydrogen bonds are responsible for the neutral inorganic–organic layer connection. The layer structure of SYSU-2 is constructed by alternating AlO4F2 octahedra and PO4 tetrahedra. The topological analysis of SYSU-2 indicates an independent topology. The NMA layers are self-assembled with π–π interaction. SYSU-2 crystals show interesting dual-band emission fluorescence properties compared with NMA crystals. Under 406 nm UV irradiation, SYSU-2 crystals emit yellow light with two emission bands at 477 and 566 nm, while NMA crystals emit blue light with only one band at 473 nm. The differences may be derived from the difference of stacking orders and distance of NMA molecule layers between the two crystals.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
ACS Omega
·
2020
·
IF 2.87
Zhenghong Zhou,Kangfei Hu,Jiawei Wang,Zhibin Li,Yan Zhang,Zhenggen Zha,Zhiyong Wang
An electrochemical synthesis for quinazolines and quinazolinones was developed via a C(sp3)-H amination/C-N cleavage by virtue of the anodic oxidation. The reaction can be carried out in aqueous media under mild conditions to afford the desired products with high yields. The reaction mechanism was proposed after detailed investigation.
研究领域:
有机化学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Nano Research
·
2017
·
IF 0.511
Wen Juan Dong,Ji Yan Han,Xin Wu,Li Fan,Wen Ting Liang
A novel near-infrared fluorescence quenching method has been developed for the determination of hydrogen peroxide based on N-acetyl-L-cysteine-capped gold nanoparticles (NAC-AuNPs) as a fluorescence probe. The prepared gold nanoparticles with the size of about 1.91 nm exhibited strong near-infrared fluorescence emission at 693 nm with excitation wavelength at 450 nm in aqueous solution. The fluorescence intensity of NAC-AuNPs was quenched dramatically by adding hydrogen peroxide. Therefore, it could be used to detect hydrogen peroxide based on the fluorescence quenching intensity was linear with the concentration of hydrogen peroxide. Under the optimal experimental conditions, the linear range and detection limit were 1.0×10-6 –3.0×10-2 mol/L and 1.0×10-7 mol/L, respectively. The possible quenching mechanism was investigated by time-resolved fluorescence spectroscopy. The proposed method was simple, sensitive and showed good repeatability and stability.
研究领域:
分析化学
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生物医学工程
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2017
·
IF 2.726
Dong Fu,Xue Feng,Pan Zhang
Amino acid ionic liquids (AAILs) including 1-butyl-3-methylimidazolium glycinate ([Bmim][Gly]), 1-butyl-3-methylimidazolium L -lysinate ([Bmim][Lys]) and tetramethylammonium glycinate ([N 1111 ][Gly]) were used to enhance the absorption of CO 2 in N -methyldiethanolamine (MDEA) aqueous solutions. The mole fractions of CO 2 in N 2 + CO 2 gas mixtures ranged from 0.2 to 1.0. The mass fractions of MDEA and AAILs respectively ranged from 0.300 to 0.400 and 0.050 to 0.100. The absorption capacity and absorption rate under series of conditions were presented and the influences of CO 2 partial pressure and the types of AAILs on the absorption performance were demonstrated.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 10
·3747-3753
·
IF 4.58
Jia Haiyan,Yang Taotao,Zuo Yinxiu,Wang Wenmin,Xu Jingkun,Lu Limin,Li Ping
The authors describe a voltammetric immunosensor with antibody immobilized on a glassy carbon electrode (GCE) modified with N-doped graphene (N-GS), electrodeposited gold nanoparticles (AuNPs) and chitosan (Chit). The preparation is simple and the thickness of the electrodeposited films can be well controlled. Due to the specific advantages of N-GS, AuNPs and Chit, the electrode has a large specific surface, improved conductivity, high stability. A new label-free immunosensor for the model antigen (alpha fetoprotein, AFP) detection was then designed by employing N-GS-AuNP-Chit as the antibody immobilization and signal amplification platform. Differential pulse voltammetry and electrochemical impedance spectroscopy were used for the characterization of the stepwise assembly process. Under the optimized conditions, at a typical working potential of +0.20 V (vs. SCE), and by using hexacyanoferrate as an electrochemical probe, the immunosensor has a detection limit as low as 1.6 pg mL −1 and a linear analytical range that extends from 5 pg mL −1 to 50 ng mL −1 . AFP was quantified in spiked human serum samples with acceptable precision.
Schematic of sensitive and effective label-free electrochemical immunosensor for the detection of AFP based on N-GS-AuNP-Chit as signal amplification matrix.
研究领域:
生物医学工程
·
分析化学
·
电化学
✓ 已验证
DOI
高影响因子
Canadian Journal of Chemistry
·
2018
·Vol. 96
·期 10
·
IF 1.084
Lingdong Li,Fengxiang Zhang,Fangyuan Gai,Hao Zhou,Xiaofang Chi,Hande Wang,Zongbao Zhao (Kent)
To control the pathogen cross contaminations on medical material surface, there is a pressing need to develop antimicrobial materials with highly efficacious surface biocidal activity. In this work, N-chloramine precursors containing a quaternary ammonium unit and perfluorophenyl azide unit were synthesized and covalently immobilized on inert polyurethane (PU) film upon UV light irradiation. The surface modification was confirmed by contact angle, Fourier transform infrared (ATR FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM) analyses. After bleaching treatment, satisfactory biocidal activity was achieved for the surface-modified PU films. It was found that the introduced surface QA center contributed an even faster surface contact killing behavior and that precursors with a longer structural linker caused higher surface chlorine content and higher antimicrobial efficacy. This approach provides a novel and facile method that enables the covalent immobilization of N-chloramine precursors on inert polymeric surface to produce durable antimicrobial materials.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
INORGANICA CHIMICA ACTA
·
2021
·
IF 2.545
Xingliang Li,Juncai Lu,Wanjun Mu,Baihua Chen,Daibing Luo,Bijun Liu,Yanqiu Yang,Hongyuan Wei,Shuming Peng
Nitrilotri–3–propanoic Acid (NTPA) and Tris(2–carboxyethyl) phosphine (TCEP) possess similar skeleton. This pair of isostructural ligands is a perfect set to assess the differences of uranyl (UO 2 2+ ) complexes with N–tricarboxylate versus P–tricarboxylate. The protonation reactions of NTPA and TCEP were investigated by potentiometry and calorimetry. Complexation of uranyl with the both ligands was studied by potentiometry and structural analysis. The results indicate that central trialkylamine in NTPA has a higher affinity for the proton than trialkylphosphine in TCEP. Crystal structures and NMR analyses indicate that central amine of NTPA and central phosphine of TCEP are not involved in the bonding. NTPA/UO 2 2+ complex is more stable than TCEP/UO 2 2+ complex. This difference cannot be explained by electronic effect of central N and P atoms because of nonbonding interactions. The higher stability of UO 2 2+ /NTPA versus UO 2 2+ /TCEP may be due to the fact that the central N atom of NTPA has a lower steric hindrance than the central P atom of TCEP. Another possible reason is that UO 2 2+ /TCEP complexes have different coordination modes from UO 2 2+ /NTPA complexes.
研究领域:
化学
·
配位化学
·
核化学
✓ 已验证
DOI
高影响因子
TEXTILE RESEARCH JOURNAL
·
2018
·
IF 1.54
Xue Zhao
Three azo dyes were synthesized using N-butyl substituted phthalimides as diazo components. All of the synthesized intermediate derivatives and dyes were characterized by mass spectrometry, proton nuclear magnetic resonance, infrared (IR) and elemental analyses. Synthesized dyes were also evaluated for their dyeing behavior and fastness properties toward polyester fabric. The ultraviolet-visible absorption maxima of the dyes were observed in the range of 445–563 nm. Bromo and cyano substitutions at the 3- and/or 5- positions of the phthalimide ring resulted in hypsochromic and bathochromic shifts, respectively. IR spectra peaks at 1770 and 1395 cm−1 of hydrolyzed dye showed that C–O groups appeared under relatively mild alkaline conditions. The K/S values of dyed polyester/elastane fabrics decreased obviously as the pH value increased. Hydrolysis of the phthalimide ring was found to be largely influenced by steric effects rather than inductive effects. Bromo substituted dyes have the lowest rates of hydrolysis. Compared with S-type dyeing disperse dyes, phthalimide dyes have lower dyeing rates and lower levelness of dye migration. The ωB97XD/6-311G(d,p) calculation found that pi-stacking interactions of phthalimide–benzene and phthalimide–phthalimide dimers increased the dye–fiber and dye–dye interactions.
研究领域:
染料化学
·
纺织科学
·
有机化学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）