SENSORS AND ACTUATORS B-CHEMICAL
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2020
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IF 7.1
Yuan Zhao,Han Liu,Lixia Shi,Wangwang Zheng,Xiaohui Jing
Early detection of prostate specific antigen (PSA) could reduce the mortality from prostate cancer. Electroactive nanostructures have attracted much attention due to their excellent electronic conductivity and favorable biological microenvironment. In particular, electroactive Cu 2 O nanoparticles (NPs) and Ag NPs exhibited unique oxidation signals at around -0.1 V and +0.2 V. The separated and non-interfere oxidation signals enabled them to be alternative electrochemical beacons for the establishment of ratiometric electrochemical sensor for PSA detection. Electroactive Cu 2 O NPs were designed to grow on the surface of reduced graphene oxide/Fe 3 O 4 nanosheets (rGO/Fe 3 O 4 NSs) and served as reference tags due to the stable differential pulse voltammetry (DPV) signals of Cu 2 O NPs, magnetic properties for the absorption on electrode and the accelerated electron transfer ability of rGO. In order to improve the sensitivity of detection, a large number of small electroactive Ag nanodots were dispersed on the surface of [email protected] (RF) NPs and served as detection tags. Electroactive [email protected] NPs were assembled with rGO/Fe 3 O 4 /Cu 2 O NSs for the fabrication of ratiometric electrochemical aptasensor. With the addition of PSA, aptamers modified [email protected] NPs disassembled from electrode surface, resulting in the decrease of DPV signals near +0.2 V and unchanged DPV signals at -0.1 V. This developed ratiometric electrochemical aptasensor achieved sensitive and accurate PSA detection. This proposed ratiometric electrochemical aptasensor has the advantages of easy preparation, simple structure and wide detection ranges.
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高影响因子
Journal of Materials Chemistry C
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2020
·Vol. 8
·期 22
·7552-7560
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IF 7.059
Se Shi,Anran Li,Renliang Huang,Jing Yu,Shuzhou Li,Wei Qi,Zhimin He,Rongxin Su
Highly functionalized materials at the nanoscale on optical fibers offer notable opportunities to construct “lab-on-fiber” functional devices with unusual properties. However, it is extremely difficult to fabricate nanostructures with special morphology on a thin cylindrical optical fiber surface using the commonly used physical lithography techniques. Meanwhile, it is vital to maintain the plasmonic properties of Ag-riched particles while improving their stability. Herein, we design a facile strategy for the fabrication of Au–Ag bimetallic nanorings (Au–Ag NRs) immobilized on optical fibers for enhanced plasmonic properties. Ag NPs are first grown in situ on an optical fiber surface through chelation and redox of polydopamine (PDA) to metal ions, and then are quickly converted into Au–Ag NRs by a galvanic replacement reaction and metal deposition. This conversion only takes 3.5 min, while the formed Au–Ag NRs exhibit outstanding localized surface plasmon resonance (LSPR) sensitivity (2204 nm per RIU) and oxidation resistance, and Au and Ag atoms are distributed uniformly in the nanorings. Furthermore, a novel and interesting formation process of the nanorings including deformation, spallation, growth in the gaps, and ring formation is studied. These findings provide a way to grow bimetallic nanorings on optical fibers, which are promising candidates for photoelectric “lab-on-fiber” devices.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
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IF 3.573
Yihua Qian,Jian Wu,Daofei Lv,Chanchan Xu,Jing Wu,Yaohong Zhao,Qibin Xia
The removal of dibenzyl disulfide (DBDS) from transformer oils is vital to the sustainable operation of transformers. Here, Ag/γ-Al2O3 samples were prepared by a planetary mixer-assisted impregnation method and characterized. The effect of adsorption time and temperature on the equilibrium adsorption of DBDS onto Ag/γ-Al2O3 was discussed. The kinetics and isotherms of DBDS adsorption on the samples were studied. The desorption activation energy of DBDS was also estimated through temperature-programmed desorption (TPD) experiments. Results indicated that the DBDS adsorption capacities on Ag/γ-Al2O3 increased quickly within the first 3 h, and the highest DBDS adsorption capacity was 69.5 mg/g, which was 232, 107, and 5.6 times higher than that of active bentonite, γ-Al2O3, and active carbon, respectively. The adsorption isotherms were well fitted by the Langmuir model, and the adsorption kinetics followed the pseudo-second-order model. The desorption activation energy of DBDS on Ag/γ-Al2O3 was much higher than that on active carbon, indicating a strong interaction between DBDS and Ag/γ-Al2O3. Finally, the hard–soft acid–base (HSAB) principle was used to explain the adsorption mechanism, confirming that DBDS as a soft base can be preferentially adsorbed by Ag/γ-Al2O3 because Ag+ is a soft acid.
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高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2020
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IF 3.306
Qian Qiu,Ru-Ru Gao,Aming Xie,Yingzhi Jiao,Wei Dong
Content of adenosine triphosphate (ATP) is an essential index in the development of various diseases and even some malignant tumors. Biosensing for ATP with high sensitivity and accuracy is of fundamental importance in both biological research and medical diagnostics. Here we report a ratiometric fluorescent sensor for ATP based on multi-color silver nanoclusters (Ag NCs). This nanosystem contains two core components: a hairpin DNA integrated with an ATP aptamer, an anchor sequence and a special template segment for synthesis of green-emitting Ag NCs; a single-stranded DNA (ssDNA) which is incompletely complementary with the anchor sequence to be a duplex scaffold for red-emitting Ag NCs. Once exposed to the target, formation of the ATP/aptamer complexes opens the hairpin structure and releases the anchor sequence to hybridize with the ssDNA, accompanied by the “turn-off” of the green fluorescence and “turn-on” of the red fluorescence. By measuring the fluorescence intensity ratio of the two signals, we successfully establish a ratiometric sensor which exhibits sensitive and accurate assay performance toward ATP, with the limit of detection (LOD) as low as 0.38 μM. Meanwhile, this ratiometric sensor shows stable recovery in real sample assay, indicating their potential promise in practical applications.
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MOLECULES
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2020
·Vol. 25
·期 5
·1199
·
IF 3.267
Tong Zhu,Hang Wang,Libin Zang,Sila Jin,Shuang Guo,Eungyeong Park,Zhu Mao,Young Mee Jung
Quantitative analysis of formaldehyde (HCHO, FA), especially at low levels, in various environmental media is of great importance for assessing related environmental and human health risks. A highly efficient and convenient FA detection method based on surface-enhanced Raman spectroscopy (SERS) technology has been developed. This SERS-based method employs a reusable and soft silver-coated TiO2nanotube array (TNA) material, such as an SERS substrate, which can be used as both a sensing platform and a degradation platform. The Ag-coated TNA exhibits superior detection sensitivity with high reproducibility and stability compared with other SERS substrates. The detection of FA is achieved using the well-known redox reaction of FA with 4-amino-3-hydrazino-5-mercapto-1,2,4-triazole (AHMT) at room temperature. The limit of detection (LOD) for FA is 1.21 × 10−7M. In addition, the stable catalytic performance of the array allows the degradation and cleaning of the AHMT-FA products adsorbed on the array surface under ultraviolet irradiation, making this material recyclable. This SERS platform displays a real-time monitoring platform that combines the detection and degradation of FA.Keywords:formaldehyde;SERS;Raman;semiconductor;TiO2
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2020
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IF 5.774
Na Liu,Xiangyu Li,Jiakai Li,Yingze Cao,Lin Feng
The synthesis of high-performance materials for purifying oily wastewater, especially stable oil-in-water emulsions that aromatic pollutants present in water, is of growing scientific and technological significance. Novel hierarchical architectures of Ag clusters deposited biomimetic membrane have been synthesized by ingeniously selecting the mussel-inspired polydopamine coatings as an intermedium layer followed by a facile wet chemical reduction method. The target micro-scaled Ag clusters which are composed of innumerable nanoparticles, firmly load on the surface of sub-micrometer polydopamine spheres (PDSs) benefiting from the chelating capacity and benign reduction ability of PDSs. The resultant Ag@PDSs deposited membrane with enormous specific surface area exhibits superhydrophilicity and underwater superoleophobicity, making it highly promising for efficient separation of various surfactant-stabilized oil-in-water emulsions and synchronously excellent catalytic reduction of water-soluble aromatic dyes. Moreover, such a construction mode can effectively prevent the aggregation and possible leaching of Ag particles, which greatly contributes to the outstanding cyclic performance and good antibacterial activity. All these features demonstrate that the two-step strategy is a facile approach to design and exploit the deposited Ag@PDSs composites for diverse actual applications in oil/water emulsion separation, catalysis and antibacterial agent.
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高影响因子
Advanced Materials Technologies
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2020
·Vol. 5
·期 5
·1901097
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IF 5.969
Sheng-Hai Ke,Pan-Wang Guo,Chuan-Yuan Pang,Bin Tian,Cheng-Sheng Luo,He-Ping Zhu,Wei Wu
The printed electronic technology, a simple, low-cost, and high-throughput method, exhibits great potential applications in various fields, particularly in intelligent and tamper-evident packaging. In this study, an all-printed flexible sensor is prepared for sensing tamper-evident packaging by screen printing the water-based silver nanowires (Ag NWs) conductive ink onto a polyethylene terephthalate substrate. This bendable sensor shows a corresponding variation relationship between the resistance of the Ag NWs layer and bending angles. In addition, it presents a stable resistance sensitivity at the bending angles of 45°, 90°, and 135°. The mechanisms of different printed structures on the sensitivity of the sensor have been discussed. The results show that the straight-line sensor with a linewidth of 2.0 mm has the best sensitive performance (the gauge factors at bending angles of 45°, 90°, and 135° are 37.1, 39.3, and 39, respectively). Moreover, the sensor exhibits a long-term mechanical cyclic stability (no apparent decay after 1000 bending cycles) and excellent adhesion performance (no distinct increase in resistance after 20 times). Because of the excellent sensing performance, the Ag NWs-based flexible sensor can accurately detect the opening status of the packaging, showing promising potential for practical tamper-evident applications.
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高影响因子
ACS Applied Nano Materials
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2020
·
IF 0
Xinyuan Bi,Yuqing Gu,Jian Ye
Single-molecule (SM) detection in surface-enhanced Raman spectroscopy (SERS) demonstrates ultrahigh sensitivity and boosts wide applications. The bianalyte SERS (BiASERS) technique largely improves the accuracy and reliability of SM SERS detection over the monoanalyte approach by avoiding the use of ultralow-concentration samples and induced inaccuracy and very limited events. Herein, dual-type single-nanoparticle (SNP) SERS detection, an adapted version of the bianalyte SM technique, was developed for the first time with two types of ultrabright gap-enhanced resonance Raman tags (GERRTs) with embedded near-infrared resonant fluorescent molecules, showing concentration- and acquisition time-dependent behaviors and the SNP sensitivity in both aqueous and dry states. Additionally, a correlative Raman imaging and scanning electron (RISE) microscopy confirms the SNP events of GERRTs on the substrate. Therefore, we expand the feasible application scenarios of the BiASERS technique from merely SM to SNP detection and more importantly demonstrate the effectiveness of the pure statistical model of BiASERS with the undoubted experimental examinations. Dual-type SNP detection of GERRTs may open new opportunities for development of ultrasensitive nanotags for reliable localized and quantitative detection in biological environments.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 15
·20104-20114
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IF 2.478
Sun Junchen,Fang Min,Zhu Weiju,Wu Zhenyu,Li Cun
SiO 2 @TiO 2 -Ag (STA) microspheres decorated with Ag nanoparticles (Ag NPs) were prepared and assembled into the photoanode. The photoanode composed of STA microspheres and TiO 2 nanoparticles (P25) was prepared by doctor blade method. UV–vis measurement indicates that the introduction of a few STA microspheres observably enhances the light scattering and capturing ability of the photoanode. The photoelectric conversion efficiency of the DSSCs with 2wt% STA photoanode increased to 7.4% from 4.3% comparing with pure P25 TiO 2 nanoparticles. The configuration DSSCs have the maximum short circuit current density ( J sc ) of 16.0 mA cm −2 and open-circuit voltage ( V oc ) of 0.780 V, which are significantly higher than the pure TiO 2 DSSCs. The significant improvement of the DSSCs performance can be due to the synergistic effect of the superior light scattering of STA and the localized surface plasma resonance (LSPR) effect of Ag NPs modified on the microspheres surface.
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高影响因子
ACS Applied Nano Materials
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2021
·
IF 5.097
Minkang Li,Lina Zhang,Zhongzheng Zhang,Jialin Shi,Yuefeng Liu,Jiansong Chen,Nannan Sun,Wei Wei
Integration of adequate activity, stability, and productivity in a catalyst is of strategical importance to achieve high performance, particularly for inactive reactants, e.g., CO2. Here, using a reversed microemulsion method, ultrafine metallic Ag nanoparticles coated with porous SiO2 can be facilely obtained using micelles as separated nanoreactors for the preparation. Such architectures allowed the rigid SiO2 matrices to act as physical spacers, so that aggregation of the Ag particles could be avoided. Meanwhile, due to the templating effect from the surfactant, large mesopores could be induced in the SiO2 shell, and thus the diffusion barrier of reactants could be minimized. When used as a heterogeneous catalyst for carboxylation of terminal alkynes by CO2 under mild conditions, the prepared xAg@SiO2 catalysts showed extraordinary performance in terms of excellent activity, stability, productivity, and wide substrate scope. The knowledge developed here may also enrich the toolbox for performance promotion of metal catalysts via specially fabricated structures.
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高影响因子
OPTICAL MATERIALS
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2021
·
IF 3.08
Shihui Yu,Xinyue Ma,Xiaopeng Li,Junjun Li,Baoming Gong,Xiaohu Wang
Silver nanowires (Ag NWs) are currently the most likely to replace indium tin oxide (ITO) as flexible transparent conducting electrodes (FTCEs), but conventional preparation methods such as solution deposition will lead to weak conductivity and low adhesion to the substrate. In this work, polymethyl methacrylate (PMMA) as a superior mediate for the pressure embedding of Ag NW networks as transparent electrodes with 120 °C is demonstrated. The sheet resistance of the PMMA/Ag NWs FTCEs decreases from 32 Ω/sq. to 8.1 Ω/sq. at an optical transmittance of ~77.5 %. The calculated value of figures of merit ( FoM )is as high as 9.77 × 10 −3 Ω −1 . At the same time, after 10 min of ultrasonication and 30 times of wiping cycle, the sheet resistance is almost unchanged, indicating that the Ag NW networks have good adhesion to the flexible substrate . Meanwhile, the PMMA/Ag NWs FTCEs exhibit good mechanical flexibility with a bending radius up to 0.75 mm. Finally, the successful implementation of the PMMA/Ag NWs FTCEs into a flexible electrochromic device is demonstrated, verifying the applicability of PMMA/Ag NWs FTCEs.
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高影响因子
Materials Research Express
·
2021
·Vol. 8
·期 7
·075001
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IF 1.62
Haibin Xue,Xuewei Gao,Xiangnan Feng,Shan He,Feifei Zhao,Guiju Zhang,Xinrui Wang,Xiaobo Luo,Shanyue Guan
The developing a green and facile synthetic approach of Ag-based antibacterial nanomaterials with controlled composition, size, and shape, to acquire high antibacterial activity and long-term durability, is of vital importance and remains a challenging goal. Herein, a novel LDHs-supported Ag antibacterial nanomaterial (Ag/CoAl-LDHs) are fabricated via an in situ deposition of the Ag nanoparticles onto the CoAl-LDHs surface. X-ray diffraction pattern (XRD) and High-resolution TEM (HRTEM) measurements confirm that the uniform Ag nanoparticles (the average particle size of 16.5 nm) are highly dispersed and firmly anchored onto CoAl-LDHs surface. As revealed by x-ray photoelectron spectroscopy (XPS), the CoAl-LDHs nanoplates play the roles of both a support and a reductant without any external, and there was a redox reaction between Co2+ in LDHs layers and Ag+ in AgNO3 solution, giving rise to in situ loading of Ag nanoparticles onto LDHs. Moreover, antibacterial experiments verify that Ag/CoAl-LDHs not only have efficient antibacterial activity against both Escherichia coli and Staphylococcus aureus, but also exhibit very stable antibacterial properties for both bacteria. Therefore, this research demonstrates a successful paradigm for the rational design and preparation of new antibacterial nanomaterials with high antibacterial activity and long-term durability.
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高影响因子
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