CERAMICS INTERNATIONAL
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2020
·
IF 3.83
Shaosheng Rao,Yi Li,Hanqing Liu,Shuai Gao,Jinxia Zhao,Nasir Rahman,Jinghan Li,Yazhou Zhou,Ding Wang,Lili Zhang,Qinqin Liu,Juan Yang
Improving the efficiency of Ag nanoparticles (NPs) in an antibacterial system remains a problem to be solved. Herein, a simple polyethyleneimine (PEI) modification strategy has been developed for realizing the high dispersion of Ag NPs with average size of 10 nm over two dimensional nanosheets of g-C 3 N 4 photocatalyst , and the as-prepared ternary Ag/PEI/CN hybrid demonstrates enhanced bifunctional performance of antibiotics (e.g., tetracycline, TC) degradation and antibacterial activity. The enhanced mechanism is investigated and proposed to be a synergy effect between reactive oxygen-containing species (ROS, e.g., •OH and O 2 •− ) derived from PEI modified g-C 3 N 4 photocatalyst and slow released Ag + ions generated by the highly dispersed Ag NPs as antimicrobial agent. Furthermore, the surface plasmonic effect of Ag NPs and coupling of PEI can increase light absorption and accelerate the electron-hole separation and mobility. Consequently, more availability of ROS along with holes and Ag + ions can accelerate the death of bacteria via destructing biomolecules. As a result, under visible-light irradiation, Ag/PEI/CN hybrid presents greatly improved antibacterial activity against E. coli , including a low MIC 100% of 30 ppm and MBC 97% of 10 ppm and enhanced photocatalytic performance towards TC degradation (~80% TC can be degraded within 60 min).
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2020
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IF 3.807
An-ran Zhang,Hui Zhong,Xiao-rong Li,Zhuan-li Bao,Zhi-peng Cheng,Yu-jie Zhang,Ping Chen,Zai-chao Zhang,Li-li Zhang,Hai-yan Qian
An electrochemiluminescence (ECL) sensor was developed with carboxylated graphene-loaded Au@Ag core-shell nanoparticles . Scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), transmission electron microscope (TEM) and inductive coupling plasma (ICP) were applied to characterizing COOH-G/Au@Ag nanocomposites . Electrochemical performance of the nanocomposites was evaluated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Based on ECL experimental results, we can find COOH-G/@Au@Ag nanocomposites have good electrocatalytic ability for glucose, so we construct a glucose electrochemiluminescence (ECL) sensor. When the glucose concentration range is from 0.005 to 1500 μM, the linear response of ECL intensity to glucose concentration was valid with detection limit of 0.02 μM. In addition, the developed sensor not only has good stability, repeatability and sensitivity for the detection of glucose, but also can be successfully used for glucose monitoring in human serum samples.
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ANALYTICA CHIMICA ACTA
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2020
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IF 5.977
Ting Zhou,Min Fan,Ruiyun You,Yudong Lu,Luqiang Huang,Yunchao Xu,Shangyuan Feng,Yang Wu,Huiying Shen,Lanjin Zhu
We have successfully prepared a highly sensitive sandwich nanosensor combined Fe 3 O 4 and [email protected] @Ag nanorods for histamine detection based on surface-enhanced Raman spectroscopy (SERS). The Fe 3 O 4 beads with –COOH served as a capture part to enrich histamine. The [email protected] @Ag core-shell nanorods functionalized with Nalpha,Nalpha-Bis(carboxymethyl)- l -lysine (AB-NTA) were then used to connect with the imidazolyl group of histamine, simultaneously the internal standard 4-aminothiophenol (4-ATP) in the core-shell structure was used as the SERS signal. PLS regression model based on concentration range 10 −3 -10 −8 mol/L showed a linear trend with R 2 = 0.9907. Our new approach can quickly and reliably determine histamine in fish sample and RAW264.7 cell lysates. This protocol for histamine extraction and SERS analysis enables the development of ultra-sensitive method for histamine detection.
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高影响因子
APPLIED SURFACE SCIENCE
·
2020
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IF 6.182
Saijiao Yang,Meiying Liu,Fengjie Deng,Liucheng Mao,Yiyang Yuan,Hongye Huang,Junyu Chen,Liangji Liu,Xiaoyong Zhang,Yen Wei
Highly sensitive and selective detection of specific DNA or metal ions based on sensor platform of dye-labeled single-stranded DNA (named as ssDNA) and functional materials has attracted great research interest over the past few decades. Herein, we reported for the first time that polydopamine (PDA) modified SiO 2 nanoparticles (PDA- co -SiO 2 NPs) could be severed as effective fluorescent quenchers for fabrication of fluorescent DNA sensor systems for detection of functional nuclear acids and Ag + . To prepare PDA- co -SiO 2 NPs, we just need mix SiO 2 nanoparticles with dopamine in aqueous solution under rather mild experimental conditions. These PDA- co -SiO 2 NPs-based sensor systems possess excellent sensitivity and selectivity, fast response for detection of target ssDNA and Ag + based on different fluorescence quenching effect of PDA- co -SiO 2 NPs towards ssDNA and dsDNA. Furthermore, the high fluorescence quenching ability of PDA- co -SiO 2 NPs allows quantitative detection of target ssDNA with a low detection limit of 1 nM. More importantly, this method would also be easily extended for preparation of many other PDA-based materials for fabrication of fluorescent DNA sensors owing to the universal attachment of PDA with various materials and surfaces. Therefore, this work will open up a new direction for analytical detection of PDA-based functional materials.
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NANOTECHNOLOGY
·
2020
·Vol. 31
·期 12
·125405
·
IF 3.551
Yuzhu Guan,Peiyuan Ji,Jing Wan,Dazhi Zhang,Zhao Wang,Hao Tian,Chenguo Hu,Baoshan Hu,Qing Tang,Yi Xi
By exploiting the storage performance of supercapacitors, iron has the potential to be used as a new anode material. However, this potential is limited by unsatisfactory electrical conductivity and poor cycling stability which impact the energy and power density. Consequently a foundation for improving the electrical conductivity and cycling stability of iron materials to obtain good storage performance is needed. In this work, Ag-modified Fe2O3 nanoparticles on carbon cloth were synthesized as an anode material for supercapacitors. The specific capacitance of the composite material reaches 10.39 F cm−2 (2734.2 F g−1) at a current density of 1 mA cm−2 and remains at 83% of this value after 12 000 cycles. The energy density is 379.8 Wh kg−1 at a power density of 131.6 W kg−1 and remains at 123.9 Wh kg−1 at a power density of 2631.6 W kg−1. The electrical conductivity and interfacial effect created between Ag@Fe2O3 is confirmed with density functional theory calculations. The packaged asymmetric supercapacitor devices have flexibility and can light ten LEDs for 2 min 30 s, with an energy density of 60.3 Wh kg−1 that can be reached at a power density of 1063.8 W kg−1 and remain at 16 Wh kg−1 even at a power density of 4255.3 W kg−1.
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ORGANIC ELECTRONICS
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2020
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IF 3.31
Rongmei Yu,Furong Yin,Chunying Pu,Haizhen Song,Xiumei Xu,Han Zhang,Wenyu Ji
Although much effort has been made to the cadmium-free quantum dot light emitting diodes (QLEDs), it is still a big challenge to achieve an efficient eco-friendly QLED. Here, an extremely efficient QLED based on Ag–In–Zn–S QDs is constructed with the insertion of an 1,3,5-tris(N-phenylbenzimidazole-2-yl)benzene (TPBi) hole-spacing interlayer. The electrical properties of single carrier devices demonstrate the TPBi blocks the hole injection, leading to a more balanced charge injection in the device. Transient electroluminescence measurements confirm that the hole accumulation adjacent QDs is dramatically suppressed after the insertion of TPBi, hence limiting the interactions between excitons and holes. Consequently, the peak current (power) efficiency of 6.0 cd/A (6.5 lm/W) is achieved. To the best of our knowledge, this is the record efficiency for the Ag–In–Zn–S QLEDs reported to date. We anticipate this work will provide a new route for optimizing the performance of Cd-free QLEDs.
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SENSORS AND ACTUATORS B-CHEMICAL
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2020
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IF 7.1
Qingwen Zhang,Danfeng Jiang,Changshun Xu,Yuancai Ge,Xiaohu Liu,Qingquan Wei,Liping Huang,Xueqian Ren,Chengde Wang,Yi Wang
We proposed a wearable electrochemical biosensor based on Ag Nanowires (AgNWs) and molecularly imprinted polymers (MIPs) prepared on the screen-printed electrode for the noninvasive monitoring of lactate in the human sweat. The MIPs were prepared by electropolymerization of 3-aminophenulboronic acid (3-APBA) with imprinted lactate molecule on the AgNWs-coated working electrode. The MIPs-AgNWs biosensor revealed high sensitivity and specificity for the detection of lactate from 10 −6 M to 0.1 M, with the detection limit of 0.22 μM. Furthermore, the sensors presented high stability and reproducibility with sensitivity recovery of 99.8% ± 1.7% during 7 months storage in a dark plastic box at room temperature. In addition, the flexible electrodes also showed stable electrochemical response after been bended and twisted for 200 times, respectively. Such MIPs-AgNWs biosensor was attached on volunteers’ skin for the noninvasive monitoring of the perspiration lactate in vivo . The wearable electrochemical biosensor provides feasibility in near future for the evaluation of human sweat in the military, sports and biomedical fields.
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ACS Applied Nano Materials
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2020
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IF 0
Junping Li,Na Chen,Shupeng Liu,Zhenyi Chen,Yana Shang,Fufei Pang,Tingyun Wang
Direct detection of drugs in the blood contributes to the study of pharmacokinetics, whereas the low-concentration blood drug makes this goal challenging. Here, silver nanoparticles (AgNPs) are used for direct detection in the blood environment. The finite element method is used to study the electric field enhancement of AgNPs in the blood environment. We study the Raman enhancement factors associated with AgNPs and study the effects of parameters such as the wavelength, medium environment, and nanoparticle distribution on near-field enhancement. The method for directly detecting oxaprozin (OXA) drug in the blood of mice is reported, which is based on surface-enhanced Raman scattering (SERS) detection. We prepare AgNPs with a diameter of 15 nm and further concentrated them as a SERS substrate to achieve low-concentration OXA solution detection in blood and aqueous environments. The minimum detection limit in the aqueous environment is 10–6 M, and the detection limit in the blood is 10–4 M (29.32 μg/mL), which is less than the peak blood drug concentration in clinical applications. Further analysis shows that OXA in the blood can be directly detected by SERS because of the characteristic peak of 1025 cm–1, and the corresponding attribution is the C–C–C plane vibration. The numerical simulation of AgNPs and the detection of OXA solution in the blood environment indicate that SERS has a good application prospect in low-concentration blood drug detection.
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Nanomaterials
·
2020
·Vol. 10
·期 9
·1624
·
IF 4.324
Haian Xia,Jiahuan An,Weizi Zhang
The metal–support interaction (MSI) has a remarkable effect on the catalytic properties, but how to precisely modulate its degree remains a huge challenge. Herein, polyvinylpyrrolidone (PVP) with three different molecular weights (MWs) (24, 58, and 130 kDa) was used as a capping agent to fabricate Ag nanoparticles (NPs) supported on ZrO2. The physiochemical properties of the catalysts were characterized by X-ray diffraction (XRD), Transmission Electron Microscope (TEM), X-ray Photoelectron Spectroscopy (XPS), and Fourier transform infrared (FT-IR) techniques. The impacts of MSI on the catalytic activity and reaction kinetics for aerobic oxidation of 5-hydroxymethylfurfural (HMF) were investigated. The results showed that the introduction of PVP with various MWs could efficiently tailor the interfacial interactions and charge transfers (CT) among PVP, the support, and Ag NPs, thereby affecting the oxidation activity of HMF. The turnover number (TON) for HMF oxidation decreases in the order of unsupported colloidal Ag clusters > Ag/ZrO2(58,000) > Ag/ZrO2(130,000) > Ag/ZrO2(24,000) > Ag/ZrO2. The reason for this large difference in the catalytic activity for HMF oxidation is that various MWs of PVP result in a change of MSI, thereby facilitating CT from PVP to Ag metal sites. This study offers a new strategy for modulating MSI by varying the MW of capping agents, thereby tuning the catalytic properties in the oxidation of HMF.Keywords:metal–support interaction;molecular weight;capping agent;PVP;HMF oxidation
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高影响因子
NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 44
·期 26
·11076-11084
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IF 3.288
Yin'an Zhu,Ye Pan,Enming Zhang,Weiji Dai
Hetero-junctions are widely considered as efficient and promising separators for photogenerated electron–hole pairs in photocatalytic processes. In this work, a self-assembled urchin-like TiO2@Ag–CuO hetero-junction was fabricated via a two-step approach combining a dealloying method with calcination using alloy ribbons as the precursors. This nanostructure exhibits enhanced degradation efficiency toward tetracycline hydrochloride (TC) under visible light irradiation, achieving a degradability of 82.86% after 3 hours, higher than those of P25, CuO, TiO2@Ag and TiO2@CuO binary hetero-junctions. The photocurrent response and electrochemical impedance spectroscopy studies reveal that the TiO2@Ag–CuO hetero-junction possesses an excellent separation ability and a long lifespan with regard to photogenerated electron–hole pairs, which may contribute to its enhanced photocatalytic ability. In addition, this unique nanostucture maintained good degradation stability even after four-cycle utilization. The findings of this work provide new ideas to prepare multicomponent hetero-junctions for water purification.
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 8
·1-7
·
IF 6.232
Sun Ye,Zhang Yao,Wang Yue,Xia Lixin
A new sensor for determination of Ag + ion (Ag + ) by surface-enhanced Raman scattering (SERS) is reported. Gold nanoparticles (AuNPs) and 4-aminodiphenyl disulfide (APDS) were chosen as the SERS substrate and probe molecule, respectively. With the addition of Ag + , three new peaks (1141, 1392, and 1435 cm −1 ) appeared in the SERS spectrum, indicating that the conversion of APDS to p , p ′-dimercaptoazobenzene (DMAB) was achieved. As the concentration of Ag + increased, the conversion of APDS to DMAB also increased and showed a good linear relationship ( R 2 = 0.9746) in the range of 10 to 100 μM of Ag + . The limit of detection (LOD) was 7 μM. Compared with the traditional determination method, the SERS method is convenient and fast and requires no complicated preprocessing.
Graphical abstract
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高影响因子
MICROCHEMICAL JOURNAL
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2020
·
IF 3.594
Xiu-Fang Huang,Bing-Xue Ren,Chi-Fang Peng,Xin-Lin Wei,Zheng-Jun Xie
In this study, the fluorescence enhancement effect of guanine base on DNA-Cu/AgNCs was reported and fluorescent methods for the determination of Hg 2+ or Cu 2+ ion were established. The effect of adjacent and inserted guanine base (G) sequences in DNA template on the fluorescence intensity of DNA-Cu/AgNCs was investigated. It was found that G 5 sequence extended from the 5′ end of a typical C-riched DNA strand, 5′-CCCTTAATCCCC-3′ (DNA1), demonstrated fluorescence enhancement effect in the preparation of the DNA-Cu/AgNCs. Moreover, this G5-DNA-Cu/AgNCs can be used to determine Hg 2+ and Cu 2+ ions due to fluorescence quenching by the two metal ions while the DNA1-Cu/AgNCs only can determine Hg 2+ ions. Specific assays for Hg 2+ ions and Cu 2+ ions were established through masking Cu 2+ ions by EDTA and Hg 2+ ions by NaBH 4 , respectively. In Hg 2+ determination, a linear range from 5.0 nM to 40 nM was obtained with a detection limit of 1.0 nM. In Cu 2+ determination, a wide linear range from 0.01 µM to 5.0 µM was obtained with a detection limit of 5.0 nM. The recoveries of 89.6–106.8% for Cu 2+ ions and 90.6–106.2% for Hg 2+ ions were obtained in the measurements of Hg 2+ and Cu 2+ ions spiked lake samples, respectively. The results indicate the potential application of the DNA-Cu/AgNCs as a metal ions probes in real samples.
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