JOURNAL OF NANOPARTICLE RESEARCH
·
2016
·Vol. 18
·期 7
·1-10
·
IF 2.101
Li Lei,Zhao Aiwu,Wang Dapeng,Guo Hongyan,Sun Henghui,He Qinye
The cube-like Fe 3 O 4 @SiO 2 @Ag (FSA) nanocomposites with great SERS activity have been successfully synthesized by a layer-by-layer procedure in this paper. The cube-like Fe 3 O 4 @SiO 2 core–shell structures were prepared via a new route and Ag nanoparticles were introduced onto their surface through a one-pot hydrothermal reaction. By controlling the reaction time, the coverage rate of Ag on the FSA surface could be tuned, and then a series of FSA composites were obtained. The SERS properties of these FSA composites were investigated using p -aminothiophenol ( p -ATP) as the probe molecule. It was found that the FSA composites synthesized with a reaction time of 6 h showed the best SERS performance, and the detection limit for p -ATP could reach 1 × 10 −7 M. For practical application, the FSA composites were also used to detect thiram, one of the dithiocarbamate fungicides that has been widely used as a pesticide in agriculture. The detection limit is as low as 1 × 10 −6 M (0.24 ppm), lower than the maximal residue limit of 7 ppm in fruit prescribed by the US Environmental Protection Agency. The resulting substrate with high SERS activity, stability and strong magnetic responsivity makes the FSA composite a perfect choice for practical SERS detection applications.
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TETRAHEDRON
·
2019
·
IF 2.379
Jingyuan Li,Qingwen Song,Hengxuan Zhang,Ping Liu,Kan Zhang,Junwen Wang,Dengsong Zhang
Chemical fixation of carbon dioxide under mild reaction conditions e.g. atmospheric pressure and low temperature depends upon the ability of catalyst. Herein, a synergistic catalytic scheme of silver sulfadiazine/ n Bu 4 NBr was described for the three-component reaction of propargylic alcohols, CO 2 , and monohydric alcohols. This catalytic system was demonstrated effectively to provide β-oxopropyl carbonates in excellent yields (up to 99% yield with 5 mol% catalyst). The method tolerated a wide scope of propargylic alcohols and monohydric alcohols under atmospheric CO 2 pressure and solvent-free conditions. The excellent catalytic performance was attributed to the synergistic catalysis confirmed by the careful experiments.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Xiaopeng Fan,Dan Zhang,Hongjuan Li,Shiguo Sun,Yongqian Xu
A novel near infrared (NIR) fluorescent hybrid system ( PD-SQ ⊂ BSA ) assembled from squaraine dye PD-SQ and bovine serum albumin (BSA) was developed for selective detection of Ag + over other metal ions in absolute PBS. The detection limit of PD-SQ ⊂ BSA for Ag + is calculated to be about 8.99 × 10 −8 M, which is lower than the guidelines for drinking water set by the WHO. PD-SQ alone shows very weak fluorescence due to aggregation-caused quenching (ACQ) property. BSA can cause PD-SQ to partially disaggregate through electrostatic and hydrophobic interactions, but various metal ions including Ag + cannot do. Interestingly, the presence of both BSA and Ag + can trigger PD-SQ to almost completely disaggregate through synergic binding of multiple S-Ag linkings derived from the biothiol moieties in BSA and PD-SQ with Ag + , resulting in obvious turn-on fluorescence change. Absorption and field emission scanning electron microscope (FESEM) spectra have been used to prove the conversion of PD-SQ from aggregates to monomers. In addition, based on the fluorescence spectra changes of PD-SQ ⊂ BSA system upon addition of Hg 2+ and ethylenediaminetetraacetic acid (EDTA), logic circuits including AND and INHIBIT logic gates with reset function were successfully constructed. This type of fluorescent system shows great potential for disease diagnosis, environmental protection, and information protection at the molecular scale.
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高影响因子
SYNLETT
·
2021
·Vol. 32
·期 14
·1437-1446
·
IF 2.454
Haifei Wang,Chuliang Gong,Chen Zhang,Xiaojun Zheng,Qinglin Hou,Qingxia Zhou,Guiyin Zhou,Yao Chen
In this work, we introduced a multifunctional Ag(I)/CAAA-amidphos complex catalyzed asymmetric 1,3-dipolar cycloaddition of acrylates with α-imino esters, affording a series of 2,4,5-trisubstituted endo-pyrrolidines in good yields (up to 97%) with high enantioselectivities (up to 98% ee). Meanwhile, the catalytic system was also applied in the three-component one-pot reaction of α-imino esters formed in situ under the action of N,N′-diisopropylcarbodiimide. In addition, the gram-scale reaction was realized for the formal synthesis of (+)-ibophyllidine in eight steps.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Yingjie Zhan,Bingfei Nan,Xiaole Zheng,Mangeng Lu,Jun Shi,Kun Wu
Here, inspired by the traditional Chinese cuisine Ma Lao, aramid nanofiber (ANF) decorated by silver nanoparticles (ANF@Ag) is prepared via in-situ depositing process of Ag ions on the surface of ANF based on dopamine chemistry reduction method. MXene/ANF@Ag nanocomposite films with various MXene concentrations are further prepared via a vacuum-assisted self-assembly strategy. ANF@Ag is designed as the organic-inorganic hybrid thermal conductive chains, while Ag nanoparticles not only play a role in heat transfer, but also catalyze the carbonization process and form massive inert gas during the combustion. Surprisingly revealing that toxic gases effectively catalyzing into friendly non-toxic carbon dioxide (CO 2 ) and forming the CO 2 molecular fire extinguisher-like effect, which are suitable for the development of ecological sustainability. The 5-MXene/ANF@Ag nanocomposite film shows excellent flame retardant properties, and the total heat release (THR) is only 0.1 kJg −1 . Meanwhile, the high in-plane thermal conductivity of 5-MXene/ANF@Ag is 18.56 W·m −1 ·K −1 , which is enhanced about 4.97 times higher than pure ANF film. It can be ascribed to the hydrogen bonding interactions and synergistic bridging effects from the MXene nanosheets and thermal conductive chains of rigid ANF@Ag. Therefore, this work displays a novel tactic to provide favorable interfacial interactions for the uninflammable thermal management materials.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Xiaohui Guan,Jingyang Chen,Enze Zhu,Penggang Yin,Liu Yang,Xin Guan,Guangsheng Wang
Layered double hydroxides (LDHs) are promising electrode candidates for supercapacitors. However, limitations like inferior cycling stability and unsatisfactory charge storage capability at low temperatures have exerted negative effects on their applications. Herein, a novel synthetic process has been elaborately designed and provided to have the composition and structure of the C/N-NiCoMn-LDH/Ag (C/N-CNMA) delicately regulated. Both the experimental and theoretical researches unveil that the incorporated manganese species and elemental silver could dramatically modulate the bandgap, crystallinity and surface electron structure of the LDH , leading to the remarkable improvement in its conductivity, exposed active sites and intrinsic electrochemical activity, and thus the OH* and O* adsorption free energy could be remarkably optimized, even at low temperatures. In addition, the low crystallinity C/N-CNMA is of great electrochemical compatibility with both the KOH aqueous electrolyte and the isobutyl alcohol (IPA) modulated organohydrogel electrolyte. By means of adjusting the solvation and hydrogen bonding in the electrolytes, the assembled hybrid supercapacitors deliver excellent energy density, power density and cycling stability in the temperature range of -30 to 25 °C. Specifically, the gel electrolyte with IPA as the anti-freezing functional additive displays high flexibility and ionic conductivity at low temperatures.
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ACS Applied Energy Materials
·
2023
·
IF 6.4
Baoquan Feng,Yiran Cheng,Chengyan Liu,Jie Gao,Guojing Wu,Xiaobo Bai,Ruifan Si,Wenpei Li,Yue Guo,Lei Miao
Ag2Se-based thermoelectric (TE) materials have attracted significant attention recently due to their potential application near room temperature. Manipulating the stoichiometric ratio of Ag/Se and anion doping are usually used as effective approaches to enhance the TE properties. Here, we report a strategy to simultaneously enhance the power factor (PF) and reduce the thermal conductivity of Ag2Se by introducing ZnSe nano-precipitates. The excessive carrier concentration in the intrinsic Ag2Se is successfully reduced by the Ag interstitial inhibition due to the introduction of secondary-phase ZnSe nano-precipitates, thereby enhancing the PF up to a maximum value of ∼22.2 μW m–1 K–2 at 383 K and decreasing the electronic thermal conductivity from ∼1.2 to ∼0.8 W m–1 K–1 at 383 K. In addition, the phonon scattering at ZnSe nano-precipitates contributes to the reduction of lattice thermal conductivity from ∼0.5 to ∼0.4 W m–1 K–1 at 383 K. As a result, a high peak zT of ∼0.7 at 383 K and an average zT of 0.6 at 313–383 K are obtained in the sample Ag2Se-0.005ZnSe, which is one of the highest values amongst Ag2Se-based TE materials. This study could provide guidance to improve the TE properties of materials similar to Ag2Se.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Xiang Yu,Jiaoming Wang,Xionghui Fu,Hui Meng,Yi Zhu,Yuanming Zhang
In this work, we successfully constructed visible-light-driven Z-scheme SrTiO 3 /Ag/Ag 3 PO 4 photocatalyst with oxygen vacancies, which exhibited highly enhanced performance for antibiotic tetracycline (TC) photodegradation compared with pure Ag 3 PO 4 and SrTiO 3 . SrTiO 3 /Ag/Ag 3 PO 4 (1:3) exhibited the best photocatalytic performance under visible light illumination, the rate constant k of which was about 2.72 and 18.55 folds higher than that of Ag 3 PO 4 and SrTiO 3 , respectively. No significant deactivation of photocatalytic performance over SrTiO 3 /Ag/Ag 3 PO 4 (1:3) after five consecutive cycles confirmed an enhanced stability, compared to pure Ag 3 PO 4 , which showed 22.1% decrease in photocatalytic activity under the same condition. The significantly boosted photocatalytic activity of the composites could be ascribed to the improved stability of Ag 3 PO 4 , superior carrier separation efficiency and higher redox capacities resulted from Z-scheme, in which metal Ag played the role as the charge transmission-bridge to quench electrons from conducting level of Ag 3 PO 4 with holes from defect levels of SrTiO 3 with oxygen vacancies under visible light illumination. Furthermore, a possible degradation pathway for TC was also proposed based on HPLC-MS. The work offered an excellent reference for further understanding and constructing Z-scheme heterojunctions which were potential candidates for degrading antibiotics in environmental purification.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Sheng Chen,Wenji Wang,Mingming Yan,Qin Tu,Shu-Wei Chen,Tianbao Li,Mao-Sen Yuan,Jinyi Wang
The sensitive detection and quantification of heavy and transition metal ions are particularly important. Among them, mercury(II) (Hg 2+ ) and silver(I) (Ag + ) ions, as the most ubiquitous heavy metal ion pollutants, are difficult to discriminate in the same system because of their similar reactions and coordination abilities. Herein, we designed and synthesized a “turn-on” chemosensor, RBTP , which is an intergrant of rhodol and 2-hydroxy benzothiazole by introducing a benzothiazole unit to the ortho -position of the phenolic hydroxy of rhodol. RBTP showed a sensitive dual-channel fluorescence-enhanced response to Hg 2+ and Ag + at 595 and 520 nm with low detection limits of 0.27 and 0.45 μM, respectively. Studies of their sensing mechanism indicated that the Hg 2+ -induced orange fluorescence at 595 nm originates from an irreversible Hg 2+ -promoted oxadiazole forming reaction and the Ag + -induced green fluorescence at 520 nm originates from special molecular packing of the RBTP -Ag + complex. Furthermore, the potential of probe RBTP as practical biological imaging agents was further confirmed in HepG2 cells. Simultaneously, RBTP exhibited remarkable solid-state luminescence with an aggregation-induced emission (AIE) feature. The AIE mechanism was thoroughly explored using X-ray single-crystal structures and photophysical determinations.
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APPLIED CATALYSIS A-GENERAL
·
2021
·
IF 5.706
Qingting Zhang,Andreas Goldbach,Na Ta,Wenjie Shen
Hexagonal molybdates ( h-MoO 3 ) include abundant Mo vacancies that are charge-compensated by cations residing within one-dimensional channels. Hence, they present an intriguing structural motif for Mo catalysis which has been hardly explored for selective oxidation of olefins. We discovered that NH 4 + and Ag + -exchanged h-MoO 3 display surprisingly varied behavior during propylene oxidation. Acrolein and acrylonitrile are the main partial oxidation products with the latter forming due to NH 4 + consumption. The catalytic activity more than doubles upon introduction of Ag + which also enhances selectivity for the main products up to ∼60 %. Unexpectedly, the hexagonal frameworks transform into orthorhombic α-MoO 3 40−60 °C below their reported stability limits already. In addition, Ag 2 Mo 4 O 13 and Ag nanoparticles segregate in case of Ag + -containing h-MoO 3 frameworks. The resulting Ag/Ag 2 Mo 4 O 13 /α-MoO 3 composites catalyze propylene conversion into acrolein with even higher selectivity (∼80 %). Detailed analyses indicate that Ag 2 Mo 4 O 13 drives formation of this oxygenate over these composites.
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高影响因子
Catalysts
·
2020
·Vol. 10
·期 7
·746
·
IF 3.52
Yuxiang Lu,Jikai Mao,Zelin Wang,Yazhou Qin,Jianguang Zhou
Controllable morphological metal catalytic materials have always been a focus in research. In the previous work, hexapod AgCl was successfully synthesized. In this paper, hexapod Ag@AgCl microstructures with diverse Ag contents are prepared through NaBH4reduction. They are characterized by scanning electron microscopy (SEM) and the element distribution is proved by an energy dispersive X-ray spectrometer (EDS). They are porous dendritic microstructures with a large specific surface area and a rough surface, which display high catalytic performance and surface-enhanced Raman spectroscopy (SERS) activity. Furthermore, the hexapod Ag@AgCl microstructure is devoted as a dual catalyst to monitor the reduction of 4-nitrothiophenol (4-NTP) to 4-aminothiophenol (4-ATP) in situ using SERS. Ultraviolet–visible (UV–Vis) spectroscopy was employed to evaluate the catalytic performance of the hexapod Ag@AgCl microstructures. The consequences show that the velocity of reaction became faster with a corresponding increase in silver content and the reaction mechanism was cleared. In addition to preparing a good catalyst, this work also promotes the combination of micro-nano materials and spectroscopy technology.Keywords:Ag@AgCl microstructure;in situ monitoring;surface-enhanced Raman spectroscopy;4-nitrothiophenol reduction
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高影响因子
CRYSTENGCOMM
·
2016
·Vol. 18
·期 34
·6513-6519
·
IF 3.849
Yuhang Wu,Congyan Li,Kaiwen Zhou,Yanhong Zhao,Xiaojing Wang
A novel catalyst, CeO2@Ag/Ag2Ta4O11, was successfully assembled via an in situ catalytic process for 4-nitrophenol reduction. As-prepared samples were characterized using high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), X-ray spectroscopy (XPS), and ultraviolet-visible diffuse reflection spectroscopy (DRS). The results showed the elementary substance Ag was produced from Ag2Ta4O11 after a circular reduction reaction and was homogeneously deposited on the surface of Ag2Ta4O11 nanoparticles, which were wrapped by octahedron-shaped CeO2. The as-prepared nanocomposites exhibited extremely accelerated catalytic activity toward the efficient reduction of 4-nitrophenol compared to pure CeO2 and Ag2Ta4O11 nanoparticles. 15 rounds of recycling experiments confirmed that the samples exhibited good reuse stability, assigned to the confined robust shield of CeO2. The shell of CeO2 efficiently prevented undesirable aggregation and leaching of Ag nanoparticles. The persistent ascending activity with an increasing number of experimental runs was related to the amount of metallic Ag gradually growing. Moreover, it was proposed that the active interfacial contact between ceria oxide/metallic Ag/the semiconductor Ag2Ta4O11 (CeO2@Ag/Ag2Ta4O11) in the core–shell structure facilitated the transfer of electrons, contributing to the enhanced activity.
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