Small
·
2021
·Vol. 17
·期 37
·2101333
·
IF 13.281
Haowei Lu,Huijie Shi,Gaoru Chen,Yonghui Wu,Jiawei Zhang,Liya Yang,Yaju Zhang,Haiwu Zheng
With the popularity of portable and miniaturized electronic devices in people's live, flexible piezoelectric nanogenerators (PENG) have become a research hotspot for harvesting energy from the living environment to power small-scale electronic equipment and systems because of its stability. For further enhancing output performance of PENG, chemical modification and structural design for piezoelectric fillers are effective ways. Thus, the 3D porous hetero-structure fillers of BCZT@Ag are prepared by freeze-drying method and subsequent chemical seeding reduction. The silicone rubber as matrix is filled into the micro-voids of fillers to prepare specialized composite. The charge transport mechanism and stress transfer efficiency in PENG can be effectively improved through specialized design which is proven by experimental results and multi-physics simulations. The improved PENG exhibit a significantly enhanced output of 38.6 V and 5.85 µA, which is 3.3 and 3.5 times higher than those of PENG without specific design. The prepared PENG can effectively harvest biomechanical energy through walk and joint bending of human body. Moreover, the PENG can be used as a trigger to remotely control wireless collision alarm system, which can acquire rapid response and shows great potential application in Internet of Things.
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JOURNAL OF DAIRY SCIENCE
·
2021
·
IF 4.034
Yuanyuan Hui,Haishuai Peng,Fuxin Zhang,Lei Zhang,Liu Yufang,Aiqing Zhao,Rong Jia,Bini Wang,Yuxuan Song
ABSTRACT Aflatoxin M 1 (AFM 1 ) is a common toxin in dairy products that causes acute and chronic human health disorders. Thus, the development of a rapid and accurate AFM 1 detection method is of vital importance for food safety monitoring. This work was to develop a novel electrochemical aptasensor for sensitive and specific determination of AFM 1. The dendritic-like nanostructure was formed on the gold electrode surface by layer-by-layer assembly of gold-silver core-shell nanoparticles modified with DNA conjugates. In the presence of AFM 1 , the specific recognition between AFM 1 and Apt caused the disassociation of the DNA controlled dual [email protected] conjugates from the surface of the electrode, causing less methylene blue to bind to the surface and weakening the electrochemical signal. The more AFM 1 there is, the weaker the electrochemical signal. Transmission electron microscope results showed that the successfully synthesized [email protected] nanoparticles exhibited a core-shell structure with Au as core and Ag as shell, and their average diameter was about 30 nm. Under optimal conditions, the electrochemical aptasensor showed a wide detection ranging from 0.05 ng mL −1 to 200 ng mL −1 , and a low detection limit of 0.02 ng mL −1 . Moreover, the proposed strategy has been successfully applied to the detection of AFM 1 in cow, goat, and sheep milk samples with satisfactory recoveries ranging from 91.10% to 104.05%. This work can provide a novel rapid detection method for AFM 1 , and also provide a new sensing platform for the detection of other toxins.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhiang Hou,Jiangfeng Chu,Cong Liu,Jinnan Wang,Aimin Li,Tong Lin,Corvini Philippe François-Xavier
Photocatalytic denitrification has attracted great attention owing to its high efficiency and environmentally friendly features. However, selectively photocatalytic reduction of high concentration nitrate to N 2 is still a challenging problem due to the competition of photons between nitrate and photocatalysts. Herein, the Ag/SiO 2 core encapsulated in the crystalline TiO 2 shell (Ag/SiO 2 @ c TiO 2 ) was constructed for improvement of photocatalytic denitrification. Finite difference time domain (FDTD) simulation demonstrated that strong light scattering improved light harvesting via optical confinement. Meanwhile, surface plasmon resonance and electron sink effect of Ag not only enhanced the photogenerated electrons density but also promoted charge carriers separation of Ag/SiO 2 @ c TiO 2 . More importantly, e cb − of TiO 2 -shell could be immediately transferred to Ag to keep the balance between Ag 0 and Ag + , which contributed to the good stability of Ag/SiO 2 @ c TiO 2 . 95.8% nitrate ( C 0 = 2000 mg/L) was removed by 5 wt%Ag/SiO 2 @ c TiO 2 with N 2 selectivity of 93.6% within 4 h. Even after five cycles, 5 wt%Ag/SiO 2 @ c TiO 2 still remained high photocatalytic denitrification efficiency (92.2%). Notably, since TiO 2 -shell prevented the reaction between Ag and Cl − , more than 92% nitrate could be removed within 5.3 h in the presence of high concentration Cl − .
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MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Weiwei Zheng,Wentao Tian,Xiaojun Liu,Qingquan Zhang,Chenghua Zong,Jia-Ping Lai,Wenfeng Zhao
Flexible surface-enhanced Raman scattering (SERS) substrates, specifically paper-based SERS substrates, are generally employed in many practical applications. However, paper-based SERS substrate quantitation is still challenging because of the inferior uniformity originating from the irregular morphology of the paper. The present study synthesized Ag nanoparticles (NPs) via the in situ photochemical reduction of Ag + ions on a titanium dioxide (TiO 2 ) film at the polyester fiber membranes (PFMs) surface. This generated many “hot spots” that presented significant SERS activity with an enhancement factor of 2.1 × 10 9 . Sodium saccharin (SS) bonded to the Ag NPs surface via the carbonyl oxygen and ring nitrogen atoms. A SERS sensor with photochemically deposited Ag NPs was prepared for the sensitive and rapid detection of SS in soft drinks with a limit of detection of 0.3 mg/L. The recovery rate ranged from 93% to 103%, indicating that this method is reliable in actual sample detection with simple pretreatment steps and can be potentially applied for the on-site detection of food additives for food safety.
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LWT-FOOD SCIENCE AND TECHNOLOGY
·
2020
·
IF 4.006
Nuo Duan,Shuo Qi,Yucong Guo,Wei Xu,Shijia Wu,Zhouping Wang
Clenbuterol hydrochloride (CLB), a kind of β-agonist, has been illegally used as a feed additive for growth promotion in the food industry in many countries. Herein, surface-enhanced Raman scattering (SERS) combined with aptamer recognition was used for the ultrasensitive and quantitative detection of CLB. Fe 3 O 4 @ [email protected] nanoparticles displaying strong SERS enhancement were synthesized and used as the active substrate. Aptamer against CLB was immobilized on the surface of the substrate to form the capture probe. The complementary DNA (cDNA) was linked to gold nanoparticles (AuNPs) carrying the Raman reporter 4-mercaptobenzoic acid (4-MBA) to form the signal probe. The detection of CLB was carried out by competitive binding between free CLB and cDNA linked on the signal probe with the aptamer immobilized on the capture probe. The SERS intensity was significantly improved by the coupling effect between the Fe 3 O 4 @ [email protected] and AuNPs, resulting in high sensitivity for the quantification assays with a limit of detection of 0.003 ng mL −1 . The recoveries of the CLB from spiked pork samples were 90.7–108.0% and the coefficients of variation (CV%) were 2.2–3.1%, demonstrating the high precision and accuracy of the assay.
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DYES AND PIGMENTS
·
2020
·
IF 4.613
Wei Zhang,Yang Luo,Yang Zhou,Ming Liu,Weitao Xu,Bing Bian,Zhu Tao,Xin Xiao
A new fluorescent probe composed of cucurbit[10]uril (Q[10]) and a water-soluble derivative of pyrene, aminopropyl-1-pyrenebutanamide (PBA), is designated. 1 H NMR spectroscopy reveals that PBA is encapsulated into Q[10] in an aqueous solution to form a stable 1:1 host-guest inclusion complex of PBA@Q[10]. This complex behaves as a highly selective fluorescence quenching probe for Fe 3+ in aqueous solutions that may be attributed to the efficient absorption of Fe 3+ , which hindering absorption of PBA@Q[10] probe at the excitation wavelength of 332 nm, and competitive experiments for the coexistence of Fe 3+ with one or all of the other metal ions (37 metal ions) reveals that the selectivity of PBA@Q[10] to Fe 3+ is not disturbed by the addition of 50.0 equiv. of the other metal ions. The limits of detection of Fe 3+ was determined to be 0.55 mM. Furthermore, the fluorescence enhancing effect of PBA@Q[10] for Ag + is detected at the above wavelength. According to the mechanistic studies, the fluorescence enhancing route involves interaction of Ag + ions with the probe, mainly under an internal charge transfer between Ag + and the probe. Outcomes of this study suggest that PBA@Q[10] probably functions as a potential and promising fluorescence sensor for monitoring of different polluting metal ions in waste waters.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 12
·1-8
·
IF 5.479
Zhong Yao,Yu Xinyue,Fu Wanying,Chen Yanwei,Shan Guiye,Liu Yichun
Gold-silver core-shell nanoparticles (Au@Ag NPs) were prepared by two successive reductions in a seed-growth method. The Au@Ag NPs are used as both a colorimetric and Raman spectroscopic probe for ultrasensitive determination of H 2 O 2 and glucose. It is found that H 2 O 2 (as produced from glucose by the action of glucose oxidase) can directly oxidize and gradually corrode the silver shell of the Au@Ag NPs. This results in a drop in the surface plasmon resonance absorbance at 400 nm, and the color of the solution changes from brownish yellow to purple. Without adding any additional chromogenic agents, the color change can be visually observed and detected photometrically. Silver NPs also are an excellent surface-enhanced Raman scattering (SERS) substrate. Due to corrosion of the silver shell, the SERS intensity (measured at 1083 cm −1 ) gradually decreases with increasing glucose concentration. The detection limits are 300 nM of glucose for the colorimetric assays, and 20 nM for the SERS assay.
Schematic representation of the method for glucose determination. H 2 O 2 can oxidize and gradually corrode the silver shell of the gold-silver core-shell nanoparticles. This results in a distinct color change of the solution from brownish yellow to purple, and a drop in SERS intensity. The effect is applied in colorimetric and Raman spectroscopic assays for glucose.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2019
·Vol. 20
·期 21
·5497
·
IF 4.183
Jingpeng Li,Minglei Su,Anke Wang,Zaixing Wu,Yuhe Chen,Daochun Qin,Zehui Jiang
We developed a novel green approach for the in situ fabrication of Ag NPs in mesoporous TiO2films via the bamboo self-sacrificing reduction of Ag(NH3)2+ions, which can inhibit fungal growth on the bamboo surface. Mesoporous anatase TiO2(MT) films were first synthesized on bamboo via a hydrothermal method. Then, Ag NPs with a 5.3 nm mean diameter were incorporated into the pore channels of optimal MT/bamboo (MTB) samples at room temperature without the addition of reducing agents, such that the Ag NPs were almost entirely embedded into the MT films. Our analysis indicated that the solubilized lignin from bamboo, which is rich in oxygen-containing functional groups, serves as a green reductant for reducing the Ag(NH3)2+ions to Ag NPs. Antifungal experiments withTrichoderma virideunder dark conditions highlighted that the antifungal activity of the Ag/MT/bamboo samples were greater than those of naked bamboo, MTB, and Ag/bamboo, suggesting that these hybrid nanomaterials produce a synergistic antifungal effect that is unrelated to photoactivity. The inhibition ofPenicillium citrinumeffectively followed a similar trend. This newly developed bamboo protection method may provide a sustainable, eco-friendly, and efficient method for enhancing the antifungal characteristics of traditional bamboo, having the potential to prolong the service life of bamboo materials, particularly under dark conditions.Keywords:bamboo;Ag/TiO2nanocomposites;self-sacrificing reduction;antifungal activity
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Haopeng Jiang,Xiaohui Yu,Jinhe Li,Lele Wang,Weikang Wang,Chunxia Wu,Liyong Tang,Qinqin Liu
Herein, a NH 2 -MIL-125(Ti)@Ag@AgCl (NM@Ag@AgCl) stacked core–shell heterojunction with Z-scheme carrier transfer mechanism was developed to fulfil the goal of synchronous reactions of CO 2 reduction and H 2 O oxidation. In detail, the NM@Ag@AgCl was obtained by in-situ loading the AgCl as the shell-inorganic semiconductor on the octahedral NM as the core-organic semiconductor, followed by in-situ transforming part of the AgCl shell into the plasmonic Ag nanoparticles using a photo-reduction method. As a result, the interface effects of core–shell architecture majorized by the Ag electronic mediator can favor the transmission of photogenerated carriers and reduce electron transport resistance; while the plasmonic Ag mediated Z-scheme mode with a giant internal electronic field provided a strong driving force to recombine the carriers with weak redox ability, reserving the carrier with strong redox ability on the NH 2 -MIL-125-core and AgCl-shell for the simultaneous reactions. The CO and H 2 O 2 yields of the optimal NM@Ag@AgCl were 6.02 and 5.43 μmol⋅g −1 ⋅h −1 , which were 3.31 and 4.02 times that of the NM, respectively. This study furnishes a novel thread for the design of core–shell organic–inorganic heterojunction with high interfacial charge transfer for realizing the simultaneous reactions.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 34
·16022-16029
·
IF 3.3
Xingguo Deng,Jingchao Li,Bo Zhao,Zhihua Li
In this study, a silver metal–organic framework (Ag-MOF) was immobilized on graphene oxide (GO) sheets via an ultrasonication process. The Ag-MOF@GO composite showed enhanced physicochemical properties, including an improved surface area and lower agglomeration, as confirmed using characterization techniques such as X-ray diffraction (XRD), the Brunauer–Emmett–Teller (BET) method, and scanning electron microscopy (SEM). Malachite green (MG) is a typical cationic dye, which can be toxic, cause environmental damage and threaten human health. Therefore, the adsorption capacities of Ag-MOF and Ag-MOF@GO for the MG dye were also evaluated at room temperature. Kinetic analysis revealed a significant increase in the adsorption capacity and rate of adsorption of Ag-MOF@GO compared with Ag-MOF. The addition of GO increases the surface area of Ag-MOF@GO and reduces the agglomeration effect, resulting in an improved adsorption capacity. Ag-MOF@GO showed a greater than 90% regenerability after three cycles.
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Analytical Methods
·
2023
·Vol. 16
·期 3
·411-419
·
IF 3.1
Xiaohui Ren,Xinyue Song,Lili Wang,Wenjie Ma,Xin Li
The reliable and accurate detection of unauthorized additives in food is significant to prevent health risks. In recent years, surface-enhanced Raman spectroscopy (SERS) with fast, simple, and sensitive capabilities has been widely used for food safety analysis. In order to detect illegally added dye molecule rhodamine 6G and small molecule melamine in food, we have proposed a fast, convenient, and label-free SERS detection technology using flower-like Ag/ZnO as the SERS substrate. The structure and morphology of the flower-like Ag/ZnO were characterized by scanning electron microscopy, energy dispersive spectrometery, transmission electron microscopy, and X-ray diffraction analysis. We investigated the SERS effect and sensitivity of flower-like Ag/ZnO toward rhodamine 6G and melamine. The synergistic effect of flower-like Ag/ZnO provides high SERS activity for the detection of rhodamine 6G and melamine at the lowest detection concentrations of 0.5 ng mL−1 and 1.0 ng mL−1, respectively. Therefore, flower-like Ag/ZnO with good sensitivity and uniformity has potential for improving the detection of illegal food additives.
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Materials Today Physics
·
2023
·
IF 11.5
Wen-Fa Chen,Xiao-Ming Jiang,Bin-Wen Liu,Guo-Cong Guo
Infrared (IR) nonlinear optical (NLO) material with a concurrently wide band gap and significant NLO coefficient in a single crystal is an incompatible but addressable challenge. Hence, for the first time, the AgGaS 2 structure evolved into an Ag-based sulfide system integrating dual s -block elements, guiding the discovery of two NLO crystals named AMgAgGa 6 S 11 (A = K, 1 ; Rb, 2 ). Structurally, title phases possess a novel NLO functional motif [AgGa 6 S 17 ] assembled by two C 2 -type supertetrahedra through a shared [AgS 4 ] tetrahedron, in which the electropositive cations A + and Mg 2+ are embedded. Thus, compounds 1 and 2 display emulative band gaps (3.15 and 3.25 eV, exceeding that of 2.65 eV in AgGaS 2 ) toward optimizing the laser-induced damage thresholds (3.1 and 3.2 × AgGaS 2 @1064 nm). Remarkably, the noncentrosymmetric phases 1 and 2 exhibit moderate second-harmonic generation (SHG) responses (0.6 and 0.7 × AgGaS 2 @1910 nm), the greater-than-commercial half of the AgGaS 2 . To the best of our current knowledge, an experimental birefringence of 1 and 2 (0.029 and 0.027, @546 nm) is first observed in quinary ordered chalcogenides , indicating that samples 1 and 2 meet phase-matching conditions at the incident laser of 1910 nm. All these observations demonstrate that crystals 1 and 2 can become prospective NLO materials. This research will pave the way for discovering excellent IR NLO crystals with wide band gaps and impressive NLO coefficients by incorporating multiple strong electropositive elements into chalcogenides .
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危险品化学品经营许可证（带存储）