ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Jingjing Li,Zhixue Zhu,Manru Zhang,Qingxin Zhang,Wenyu Sun,Yeru Wang,Long Jiang,Zhiqiang Guo,Yu Wang,Su Liu,Jiadong Huang,Jinghua Yu
Uracil-DNA glycosylase (UDG) is a common glycosylase that can expressly recognize and remove damaged uracil bases, and the ultrasensitive detection of which is significant to maintain genomic stability and early clinical diagnosis of disease. Herein, we proposed a sensitive colorimetric sensing platform to detect UDG. Combined with target-manipulated drawstring DNAzyme and [email protected] nanorods ( [email protected] NRs) indicator, we achieved in naked-eyes observation and ultrasensitive detection of UDG. Briefly, when the UDG exists, the dynamic reaction of rope pulling will occur generating the active conformation of DNAzyme. The cutting effect will be further produced when we add Mg 2+ , thus the generated trigger chain can mediate the occurrence of CHA reaction, followed by generating amount of ·OH which can etch [email protected] NRs causing the shifted of localized surface plasmon resonance (LSPR) peak. By contrast, there is no obvious shift of LSPR peak. This strategy shows extraordinary specificity and sensitivity toward UDG providing a detection limit of 4.6 × 10 −5 U mL −1 . By using of this method, we detected UDG specifically in complex samples, proving that it’s potential applications in biomedical research and clinical diagnosis are fantastic.
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PubMed
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Cheng Zhang,Congying Shao,Junsheng Wang,Ziwei Li,Mengna Liang,Yongxiang Wang,Dan Liu,Shun Lu
Copper nanoclusters (CuNCs) with bright blue-emitting fluorescence have been synthesized via a simple one-pot process using 2-mercapto-1-methylimidazole (MMI) as a stabilizer. The as-prepared MMI-CuNCs exhibited a high quantum yield of 19.2%, a long luminescence lifetime of 10.57 μs, and excellent photostability. Significantly, the fluorescence intensities of MMI-CuNCs were effectively quenched with addition of Ag+ ions, and the MMI-stabilized CuNCs were developed as a sensitive fluorescent nanoprobe for the label-free determination of silver ions for the first time. The fluorescence sensor provided a fast linear response toward Ag+ in the range of 0.025–50 μM, with a detection limit of 6.7 nM. The fluorescence quenching mechanism was ascribed to an agglomeration-induced effect and static quenching. A fluorescence sensing platform was successfully applied for Ag+ detection in human serum samples with good accuracy and high reproducibility, signifying the practical applicability of the assay. Additionally, MMI-CuNCs displayed good solid-state blue emission and are suitable for security ink applications. The MMI-CuNCs were utilized as a color conversion layer to construct blue- and white-light-emitting diodes (LEDs) with excellent white light properties by a facile combination of MMI-CuNCs and UV LED chips. This result facilitates multiple functions of MMI-CuNCs in the application of label-free sensors, anticounterfeiting, and optical devices.
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高影响因子
Nanoscale
·
2022
·Vol. 14
·期 24
·8825-8832
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IF 8.307
Fang Cheng,Wenjie Gu,Han Zhang,Chunyuan Song,Yunfeng Zhu,Feiyue Ge,Kuiming Qu,Hai Xu,Xue-Jun Wu,Lianhui Wang
Controlled synthesis of noble-metal nanoframes is of great interest due to their promising applications in plasmonics and catalysis. However, the synthesis is largely limited to a multiple-step approach involving selective deposition followed by selective etching. Here we report a facile and general strategy to synthesize Au–Ag nanoframes based on a direct galvanic replacement reaction between Ag nanoparticles and a gold(I) complex, sodium aurothiosulfate, without an extra etching process. The formation of Au–Ag nanoframes in our approach undergoes a continuous concaving and hollowing-out process from Ag templates, which is related to selective Au deposition and the Kirkendall effect. As a proof-of-concept, it was shown that Au–Ag nanoframes with different dimensions can be prepared from the corresponding Ag nanocolloids using our strategy. The prepared wire-like Au–Ag nanoframes show superior single-particle surface-enhanced Raman scattering due to the linear narrow nanogaps within the nanoframes. We believe this study signifies a new approach by mediating galvanic replacement to prepare noble-metal nanoframes with precise controllability, which may enable a variety of applications in plasmonics and catalysis.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2022
·Vol. 46
·期 15
·23056-23068
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IF 4.672
Yan Ma,Minming Zou,Wenjing Chen,Shikun Xiao,Wenxing Luo,Jiatao Zhou,Yinhui Che,Shuai Zu,Qinglin Li,Xiongxin Jiang,Xiaowu Hu
Summary Recently, the technology of employing phase change materials (PCMs) for solar energy storage has grown more magnetic due to the focus of various latent heat storage investigations to solve the energy crisis. In this work, a novel and eco-friendly shape-stable phase change material based on a biological matrix was prepared through vacuum impregnation, which used porous carbon as a support substrate from Cyperus alternifolius (CA), polyethylene glycol (PEG) as the phase change medium, and silver nanoparticles attached to the matrix as the reinforcement factor. The superior porous structure of CA allows it to have a high loading rate of PEG. The multifunctionality of silver nanoparticles can increase the thermal conductivity of the bio-based shape-stable phase change material (BSPCM) up to 0.676 W/(m K), while also boosting its photo-thermal conversion efficiency to 82.7%. Furthermore, the Ag@BSPCM has an excellent melting enthalpy of 137.3 J/g, as well as outstanding thermal stability and reliability. Additionally, the great photo-to-thermal conversion efficiency of Ag@BSPCM (82.7%) and the significant anti-leakage capability bodes well for its future application. This demonstrates the prepared Ag@BSPCM proves its feasibility for thermal energy storage management and photo-thermal conversion.
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JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Guohao He,Mingming Li,Xin Li,Qimeng Wang,Zhiying Xie,Yali Xue,Kai Wang,Jun Yu,Gengzhi Sun,Haizhou Yu,Xiaoyan Qiu
Isoporous membranes from a process coupling the self-assembly of block copolymer with nonsolvent-induced phase separation (SNIPS) could enhance both the permeability and selectivity due to the high pore density and uniform pore sizes. Whereas, it is difficult to precipitate PAA based block copolymer in nonsolvent to make membranes because PAA blocks are hydrophilic. Herein, isoporous PS 678 - b -PAA 180 membranes were well prepared after reinforced by multiwalled carbon nanotubes decorated with silver nanoparticles (MWCNT-Ag). Such composite membranes bear not only regular channels with an effective pore diameter of ca. 18.85 nm, but also high water permeance of 1770.35 L bar −1 m −2 h −1 . With the participation of carbon nanotubes, the PS- b -PAA isoporous membrane exhibits excellent photothermal conversion properties, which endows the membrane with an efficiency of ca. 10.6 kg m −2 h −1 for light energy-driven seawater desalination and wastewater purification. Moreover, the silver particle-decorated CNTs enable the membrane to be antibacterial, which ensures reliability in long-term application.
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高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Yingying Dong,Tao Wang,Shui Hu,Ying Tang,Xiaotong Hu,Yaoyao Ye,Hui Li,Ding Cao
The efficient electrochemical synthesis of ammonia (NH3) is a topic of great concern in theoretical research and in various industries. However, given the limitations of high-performance catalysts, achieving high NH3 yields from the electrocatalytic N2 reduction reaction (ENRR) remains challenging. In this work, we report that a Ag-doped titanium dioxide (TiO2) nanofiber catalyst synthesized by a simple electrospinning method could effectively convert N2 into NH3 at room temperature. The Ag-doped TiO2 nanofibers had a high NH3 yield rate of 3.158 × 10–10 mol s–1 cm–2 with a Faradaic efficiency (FE) of 0.13% at a low overpotential of −0.6 V versus a reversible hydrogen electrode (RHE) in acidic solution (0.1 mol L–1 HCl). The absence of hydrazine in the system proved that the prepared catalyst has excellent selectivity. Operation for eight consecutive cycles at an overpotential of −0.6 V vs RHE demonstrated the high stability of the Ag-doped TiO2 nanofibers without obvious variations in the NH3 yield rate and FE. The current density in the chronoamperometric curve did not decrease remarkably over 12 h of continuous electrolysis, thus confirming the durability of the catalyst. This work proves that Ag/TiO2 nanofibers may be a highly efficient ENRR catalyst that could achieve high NH3 yield rates. The unique structure of the interface between Ag and TiO2 in the Ag/TiO2 nanofibers prepared by electrospinning not only enhances the adsorption of N2 but also promotes electron exchange and the synergy between the nanofibers and N2.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 22
·26465-26479
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IF 2.478
Zhu Wanrong,Song Jimei,Wang Xule,Lu Yun,Hu Gang,Yang Jie
A series of Ag/AgBr/BiOBr photocatalysts with different weight contents of Ag/AgBr were successfully constructed via a simple precipitation method in 80 °C water bath. Photocatalysts were characterized by XRD, XPS, SEM, TEM, N 2 Adsorption-Desorption (BET), and UV–Vis Diffuse Reflectance Spectroscopy (DRS). Compared with BiOBr and Ag/AgBr, all the composite photocatalysts show the prominent photocatalytic activity for the degradation of tetracycline (TC). Especially, 1:5Ag/AgBr/BiOBr (20%) has the highest reaction rate constant (kapp = 0.20 min −1 ). Moreover, according to the results of radical scavengers runs, ·OH and h + acted as the main reactive species in the degradation process. Based on above, a possible photocatalytic mechanism for organics degradation over Ag/AgBr/BiOBr was proposed. Interestingly, the redox cycle between O 2 /·O 2 − and Br − /Br 0 assisted with the surface plasmon resonance (SPR) effect of silver dramatically promotes the separation and transfer of electron–hole pairs, and improves the photocatalytic activity of the as-obtained composite samples.
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高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Wenzhi Zhang,Tian Jiang,Xiuxiu Sun,Ani Zhou,Maoguo Li
Peracetic acid (PAA) is commonly used as the strong oxidant in many areas. However, high concentration of PAA can be harmful to health of people. The quantitative determination of PAA is of great significance. Here, a metal–organic framework (MOF) is introduced into the electrochemical sensor for PAA detection. The influence of common transition metal centers on the performance of electrochemical detection of PAA was investigated and the results showed the Cu-1,3,5-trimesic acid (Cu-BTC) was the best original MOF. Ag nanoparticles were decorated in the Cu-BTC to further improve the electrocatalytical activity. The concentration of the added Ag salt and the quality of the reducing agent tannic acid (TA) had a great impact on the performance. The final sample optimized for the synthesis conditions was named as Ag NPs/Cu-BTC. The electrochemical sensor based on Ag NPs/Cu-BTC/GCE was fabricated for sensing PAA with a wide linear range (0.1–5000 μM), low detection limit (0.046 μM, S/N = 3) and high sensitivity (1013.4 μA mM −1 cm −2 ). The water stability of Ag NPs/Cu-BTC and the anti-interference ability of the sensor were good. The electrochemical sensor could be applied in detecting the concentration of PAA in the commercially available peracetic acid, suggesting the practical application value.
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高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Lei Chen,Chun Li,Xiaoqing Si,Xiaoyang Wang,Zhiquan Wang,Jian Cao
Based on reactive air brazing (RAB), we designed a new type of sealant (Ag–xCuAlO 2 ) for joining 3 mol.% yttria-stabilized zirconia (YSZ) ceramics and AISI 310S stainless steel. The CuAlO 2 content affected the wettability of the sealant on the YSZ surface, and the joints had a high shear strength when Ag–2 wt.%CuAlO 2 , which had a small contact angle on the YSZ substrate, was used as the sealant. In addition, the thickness of the oxide layer was reduced compared to that for the Ag–CuO sealant. The effects of the processing parameters on the microstructure and shear strength of the joints were investigated, and the as-brazed joints reached their highest shear strength (93.7 MPa) when brazed at 1040 °C for 30 min. After high-temperature oxidation at 800 °C for 200 h, the shear strength of the joints remained at 50 MPa, and no apparent change in the microstructure was observed, proving that the joints possessed excellent oxidation resistance .
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高影响因子
CHEMICAL PAPERS
·
2021
·Vol. 75
·期 7
·3679-3693
·
IF 2.097
Cheshari Emily C.,Ren Xiaohui,Li Xin
Carbamate pesticides are popularly used in agriculture due to their relatively low toxicity and their more degradable nature compared to organophosphates. Resultant residues pose a threat to human and animal health, aquatic systems and wildlife. Carbaryl and thiodicarb are used to control pests in a variety of agricultural crops. Monitoring the level of these pesticides in the environment is crucial in ensuring environmental safety. Multi-template imprinted polymers combined with surface enhanced Raman spectroscopy (SERS) are attractive for sensitive and effective multiple analyte detection for application in pesticide residue studies in environmental matrices. A core–shell Ag-dual template molecularly imprinted polymer (MIP) composite was synthesized and evaluated in this study. Computational design was used to study intermolecular interactions in the pre-polymerization mixture between methylacryamide (MAM) (functional monomer) and the templates carbaryl (CBL) and thiodicarb (TDC). The interaction between the computer simulated template-functional monomer complexes was evaluated by examining the hydrogen bonds to provide insights on the observed binding performance of the dual imprinted polymer. The MIP was then synthesized and its binding properties towards CBL and TDC investigated experimentally. More so, we compared the performance of the mono-template MIP materials and the dual-template MIP material in detection of the templates. The experimental results corroborate the computer simulation results and reveal that CBL has higher adsorption capacity as supported by higher number of hydrogen bonds in the template monomer complex. Therefore, the study presents a cost-effective approach that utilizes a dual-template imprinted polymer for detection of carbamate pesticide residues.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Yan Zhu,Fang Zhou,Junqiang Hu,Longlai Yang,De-Quan Yang,Edward Sacher
Colorless Ag-Cu nanoparticle (NP) dispersions have been prepared by heating polyvinyl pyrrolidone (PVP)- polyvinyl alcohol (PVA)-stabilized Ag NPs with Cu ions . They were characterized by TEM photomicrographs and UV-Visible spectroscopy. They showed high stability, and enhanced antibacterial effects against S. aureus , P. aeruginosa , E. coli and C. albicans . The antibacterial order decreased from Ag-Cu NPs to Ag NPs + Cu ions, to unheated Ag NPs, to heated Ag NPs.
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高影响因子
OPTICAL MATERIALS
·
2021
·
IF 3.08
Xinli Wang,Jin Li
The development of metal/semiconductor photoactive materials has progressed remarkably with respect to heterogeneous photocatalysis . In this study, pristine ZnO quantum dots (ZQ) and Ag/ZQ nanocomposites with different Ag loadings were prepared using a cost-effective method. The synthesized samples were characterized using X-ray diffraction, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, and electron paramagnetic resonance analyses. Photocatalytic experiments indicated that the Ag11/ZQ nanocomposite (Ag content of 11 wt%), exhibited excellent photocatalytic activity for methylene blue degradation. A combination of ultraviolet–visible spectroscopy, photoluminescence spectroscopy, electrochemical impedance spectroscopy , time-resolved photoluminescence analyses, and analog computational analysis were employed to propose the mechanism underlying the enhanced photocatalytic activity of Ag/ZQ nanocomposites. This was attributed to the effective charge transfer to the surface-decorated Ag, which efficiently suppresses electron–hole recombination in the ZQ, as well as oxygen vacancies (V O ) on the ZQ surface provide more reactive sites. Consequently, Ag/ZQ nanocomposites are promising photocatalytic materials for the removal of organic pollutants from wastewater.
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