SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2022
·
IF 4.831
Yazhou Qin,Shusheng Yin,Mingjie Chen,Weixuan Yao,Yingsheng He
The problem of opioid abuse has become a global problem. Thus, creating an urgent need for highly sensitive detection of opioid substances. In this work, we developed a method for the controllable preparation of Ag@Au nanocrystals (Ag@Au NCs) for highly sensitive SERS detection of fentanyl and its analogs. By regulating the concentration of ligands on the surface of silver seed, we successfully prepared Ag@Au NCs with three different morphologies, including core-satellite, yolk shell and hollow structure. Firstly, we explored the SERS-enhancing effect of Ag@Au NCs with different morphology using rhodamine 6G as the molecule to be tested. The results show that the core-satellite Ag@Au NCs has the best SERS effect, and the lowest detection concentration for R6G reached to 10 -10 M. Furthermore, we used the prepared core-satellite Ag@Au NCs to detect fentanyl and its five analogs, including carfentanyl, furanylfentanyl, thiofentanyl, 4-fluorobutyrfentanyl and N-4-piperidylacetanilide. Trace detection was achieved for the above six substances. For the environmental water samples spiked with fentanyl, the calculated recovery was 89.2% with an RSD value of 7.3%. Moreover, in order to realize the qualitative analysis of the characteristic peaks of different fentanyl analogs, we performed DFT calculations on the Raman spectra of the above-mentioned 6 substances. By analyzing the DFT calculation results, conventional Raman spectroscopy and SERS spectroscopy, we realized the distinction of six fentanyl analogs with similar structures.
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JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
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2022
·Vol. 32
·期 15
·6665-6676
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IF 2.036
Zhang Tuo,Qian Qiuhua,Yang Ming,Zang Cao,Zhang Bo,Hou Yan,Zhen Jinming,Zhang Ran,Han Weifang,Jia Zhengfeng
Reduced graphene oxide/silver (rGO/Ag) nanoparticles (RGANs) were prepared in an in situ facile way. The RGANs microstructure was characterized by field-emission scanning electron microscopy, transmission electron microscopy, x-ray diffraction, and Raman spectroscopy, respectively. The tribological performance of liquid paraffin (LP) containing oleic acid-modified rGO/Ag nanoparticles (ORGANs) demonstrated that the LP-ORGANs showed excellent friction-reducing and antiwear properties than pure LP. The investigation revealed that the synergetic effect and the deposition of tribo-film containing elements of C, N, O, Fe, and Ag improved their tribological properties. The permeation of Ag ions into the graphene oxide (GO) interlayers and the growth of Ag nanoparticles possibly contribute to the small Van der Waals forces of rGO nanosheets and result in excellent friction reduction and antiwear actions.
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SENSORS AND ACTUATORS B-CHEMICAL
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2022
·
IF 9.221
Peilin Wang,Zizhun Wang,Zhenrun Li,Yuan Wang,Qiang Ma
In this work, a novel electrochemiluminescence (ECL) biosensor was fabricated to detect the mutant KRAS gene in the tumor tissues. Firstly, a new kind of chitosan-based dots was prepared and regulated by phenylboronic acid (PBA) as ECL nanoprobe. Furthermore, the electrochemically deposited Ag structures with controllable morphology have been developed on the electrode. The detailed electrochemical deposition condition of Ag structure has been investigated deeply. Due to the synergistic effect of the large active surface area and the high conductivity , the layered Ag flower-like structure with branches can significantly enhance the ECL intensity of CS-PBA dots by 12.1 times. Finally, the toehold mediated strand displacement strategy was employed in the ECL biosensor to quantitatively detect mutant KRAS gene with the range of 0.01 pM to 10 nM. The limit of detection was 3.3 fM. This biosensor has been used successfully to analyze the target DNA in the tumor tissues of actual cancer patients . The results showed the novel sensing platform possessed great potential for clinical analysis.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Jinxing Hou,Guodong Dai,Jiuwu Wang,Xian Sun,Yue Situ,Hong Huang
A novel ternary polythiophene/Ag/protonated g-C 3 N 4 nanosheets (PTh/Ag/pCN) nanocomposite was constructed by electrostatic self-assembly strategy. The as-prepared 5% PTh/Ag/pCN exhibits excellent visible light photocatalytic performance toward methylene orange (MO), which is 6 and 3.7 times higher than pCN and PTh, respectively. The result was dominantly ascribed to the forming of Z-scheme heterojunction due to the synergetic effects of pCN, Ag and PTh, which is conductive to the separation of photogenerated charges. Meanwhile, the radical trapping experiments and ESR techniques proved that the photogenerated holes and superoxide radicals are vital reactive substances. This study provides a powerful approach to enhance catalytic activity of conjugated polymer photocatalyst .
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Bofang Tian,Zhenxin Huang,Xilian Xu,Xiehong Cao,Hui Wang,Tingting Xu,Dezhi Kong,Zhuangfei Zhang,Jie Xu,Jinhao Zang,Xinjian Li,Ye Wang
Although lithium metal and sodium metal are promised as ideal anodes for lithium ion batteries (LIBs) and sodium ion batteries (SIBs), they still suffer from inevitable dendrite growth. In light of this, silver nanoparticles (Ag NPs) are sputtered onto three-dimensional carbon nanotube decorated graphene foam (3D CNT-GF) to construct superior 3D Ag/CNT-GF composite matrix for lithium metal anodes (LMAs) and sodium metal anodes (SMAs). With this design, lithiophilic/sodiophilic Ag NPs could provide favorable sites to guide Li/Na metal nucleation and growth, thus leading to low nucleation overpotentials, high Coulombic efficiency and long cycle performance. Accordingly, 3D Ag/CNT-GF electrodes can stably cycle for 1000 and 750 cycles at 3 mA cm −2 with 1 mAh cm −2 for SMAs and LMAs, respectively. More attractively, it can also stably sustain 300 cycles (SMAs) and 500 cycles (LMAs) at a large current density of 5 mA cm −2 with 1 mAh cm −2 . The excellent electrochemical performance can be attributed to the lithiophilic/sodiophilic electrode surface, 3D porous electrode structure and the dendrite-free morphology as demonstrated by ex-situ scanning electron microscopy (SEM) and in-situ optical microscopy analyses. Furthermore, full cells based on Na@3D Ag/CNT-GF||Na 3 V 2 (PO 4 ) 3 @carbon (NVP@C) and Li@3D Ag/CNT-GF||LiFePO 4 (LFP) could deliver highly reversible capacities of 90.1 and 106.4 mAh g −1 , respectively, at 100 mA g −1 after 200 cycles for SIBs and LIBs, respectively. This work demonstrates a novel 3D Ag/CNT-GF matrix for boosting Li/Na deposition stability for their future applications.
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Zhiyu Liu,Ye Li,Shuangshuang Peng,Ju Huang,Bolin Su,Kai Gao,Shuai Zhou,Zhaojian Gao,Teng Chen
In this work, 3D flowerlike Ag NPs/NiCo-layered double hydroxide (NiCo-LDH) decorated on melamine sponge was fabricated through a facile hydrothermal and in-situ reduction method. 3D flowerlike Ag NPs/NiCo-LDH were demonstrated to immobilize on the skeleton of polydopamine-pretreated melamine sponge. The melamine sponge decorated with 3D flowerlike Ag NPs/ NiCo-LDH presented outstanding catalytic activity for reduction of various water-soluble organic dyes in the appearance of NaBH 4 as reducing agent, including 4-nitrophenol (4-NP), rhodamine B (RhB), methylene blue (MB) and methyl orange (MO), respectively. Owing to the appearance of Ag NPs, the melamine sponge decorated with 3D flowerlike Ag NPs/NiCo-LDH also showed efficient antibacterial activities against Gram-positive Staphylococcus aureus and Bacillus cereus , and Gram-negative Escherichia coli and Pseudomonas aeruginosa , suggesting its broad-spectrum antibacterial property. Moreover, the melamine sponge decorated with 3D flowerlike Ag NPs/ NiCo-LDH could also achieve the separation process for insoluble oils/organics from water by a facile surface modification technology after being treated toward low-surface-energy chemical of octadecylamine. The octadecylamine-coated sponge exhibited superhydrophobicity (WCA=158.6°) and superoleophilicity (OCA=0°), which could adsorb a wide range of oils/organics without the adsorption of any water, thus realizing the process of oil/water separation. The novel comprehensive melamine sponge demonstrates a new strategy for the remediation of complex polluted water.
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CRYSTENGCOMM
·
2022
·Vol. 24
·期 26
·4764-4771
·
IF 3.756
Tingting Fan,Yan Ke,Lijun Zhang,Li Cai,Zhongbo Li
Large-area three-dimensional (3D) well-ordered Co(OH)2 nanoflower array films decorated with Ag nanoparticles (Ag NPs) with a novel structure were designed as sensitive SERS substrates for trace detection of pesticides. Co(OH)2 nanoflowers were electrodeposited on the surface of molded polyacrylonitrile (PAN) films with ordered nanopillar arrays and then Ag NPs were sputtered onto of the surface of each Co(OH)2 nanoflower. The SERS performance of the as-prepared films can be optimized by tuning the Ag-sputtering duration and the morphology of the Co(OH)2 nanoflower arrays. Owing to the formation of high-density SERS “hotspots” created in the nanogaps between the adjacent Ag NPs located on the same and neighbouring Co(OH)2 nanosheets, the optimized substrates show SERS activity for probe molecules. As a result, 10−11 M rhodamine 6G and 10−9 M 4-aminothiophenol can be SERS recognized, respectively. To verify their practical application, the optimized SERS substrates were employed for trace detection of thiram (a type of pesticide), and 10−9 M thiram can be recognized, showing great potential in pesticide detection.
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TALANTA
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2022
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IF 6.556
Ya-Qin Liu,Wei Zhu,Quan Yuan,Ji-Ming Hu,Xin Zhang,Ai-Guo Shen
Developing a rapid, low cost and sensitive sensing strategy for undifferentiated detection and fast killing of bacterial pathogens are critical to alleviating bacteria infections. Here, we propose a direct photoreduction method to synthesize the SERS tag by integrating poly(4-cyanostyrene) nanoparticles (NPs) and silver ions , which are applied as bio-sensing system for bacteria sensing and fast killing. Under a focused laser spot, silver ions on the surface of the poly(4-cyanostyrene) NPs could be photoreduced into Ag NPs, thereby causing the Raman signal amplification of poly(4-cyanostyrene) NPs up to 40 times, and there is a good linear correlation between the Raman intensity of poly(4-cyanostyrene) NPs and different concentrations of Ag + . Moreover, 4-mercaptophenylboronic acid, performing the same recognition function for both the Gram-positive and Gram-negative bacteria, is used as bridge between the bacteria and Ag + by the inherent chemical bonding. Based on further constructed bio-sensing system, we achieved the quick count and killing of both Gram-positive bacteria, e.g. , Staphylococcus aureus ( S. aureus ), and Gram-negative bacteria, e.g. , Escherichia coli ( E. coli ). Notably, the sensing strategy can detect at least ∼100 cells of E. coli , ∼10 cells of S. aureus and ∼10 cells of their mixture in less than 40 min. The detection accuracy for actual samples can also reach over 80% and the bacteria were entirely killed by Ag + after the detection, avoiding bacterial contamination in the environment. This novel method is anticipated to perform as a simple yet effective tool for fast and sensitive bacteria counting and killing.
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VIBRATIONAL SPECTROSCOPY
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2022
·
IF 2.382
Yuanjie Teng,Zhenni Wang,Weihao Huang,Yuanbin She
Some noble metal colloids with negative charges were mostly used as surface-enhanced Raman scattering (SERS) substrates, that the Raman signals of negatively charged molecules are hard to be detected because of the electrostatic repulsion among them and the negatively charged metal nanoparticles . Herein, Ag nanoparticles (Ag NPs) with positive charges and its Ag nanofilm were prepared by poly dimethyl diallyl ammonium chloride (PDDA) to realize the SERS detection of negatively charged molecules directly. The zeta potential and its particle sizes were characterized to select the optimum condition of PDDA. In addition, the morphology of positive Ag NPs and Ag nanofilm was characterized by UV–Vis spectroscopy and transmission electron microscopy . The SERS effect of negatively charged thiamphenicol on positively charged Ag nanofilm was significantly enhanced at the optimum condition and its sensitivity was significantly improved compared with normal Ag nanofilm. The proposed novel positively charged Ag nanofilm can be further applied to detect other negatively charged molecules by SERS.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
·
IF 24.319
Yuhua Mao,Hao Zhang,Saad Ahmed,Shanshan Li,Shouhao Zhang,Jianli Wang
In this work, we report a novel and highly efficient catalytic membrane (PES/PNM-Ag) comprising well-dispersed silver nanoparticles (NPs). The membrane can be straightforwardly constructed via dynamic loading expansible hybrid microgels PNM-Ag into a commercially-available poly(ether sulfone) (PES) membrane with asymmetric structure. Characterization results of PNM-Ag and PES/PNM-Ag indicate that a nanoscale three-dimensional network embedded with Ag NPs was developed in membrane pores by swollen microgels. The flat-sheet membrane reactor assembled with PES/PNM-Ag can efficiently and continuously catalyze the reduction of 4-nitrophenol (apparent reaction rate constant reaching 1.12 s −1 ) and showed good stability. The improved catalytic activity was attributed to fully accessible surface of Ag NPs as well as the unique structure of the membrane, in which the reactant was restricted to flow through immobilized catalyst. Present strategy hints to design other noble metal NPs loaded catalytic membranes for efficient conversion of nitro-aromatic pollutants.
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Biomedical Materials
·
2022
·Vol. 17
·期 3
·035006
·
IF 4.103
Haibo Wang,Ao Dong,Kun Hu,Weiwei Sun,Jundong Wang,Lu Han,Lixin Mo,Luhai Li,Wei Zhang,Yan Guo,Li Zhu,Fuzhai Cui,Yen Wei
Poly L-lactic acid (PLLA) is a non-toxic, biocompatible degradable polymer material with excellent mechanical properties after moulding. However, it faces challenges in the use of biomedical materials because of its intolerance to bacteria. Here, we use an easy-to-operate method to prepare a composite multilayer membrane: PLLA membrane was used as substrates to assemble positively charged chitosan and negatively charged Ag@MXene on the surface using the layer-by-layer (LBL) method. The assembly process was detected by fluorescein isothiocyanate-labelled chitosan and the thickness of the coating multilayer was also detected as 210.0 ± 12.1 nm for P-M membrane and 460.5 ± 26.5 nm for P-Ag@M membrane. The surface self-assembled multilayers exhibited 91.27% and 96.11% growth inhibition ratio against Escherichia coli and Staphylococcus aureus strains under 808 nm near-infrared laser radiation with a synergistic photothermal antibacterial effect. Furthermore, best biocompatibility of P-M and P-Ag@M membranes compare to PLLA membrane motivated us to further explore its application in biomedical materials.
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Green Energy & Environment
·
2022
·
IF 12.781
Jiakai Li,Changpeng Lv,Jiajia Song,Xiaoling Zhang,Xizhen Huang,Yingzhuo Ma,Haijie Cao,Na Liu
Superwetting materials have drawn unprecedented attention in the treatment of oily wastewater due to their preferable anti-fouling property and selective oil/water separation. However, it is still a challenge to fabricate multifunctional and environmentally friendly materials, which can be stably applied to purify the actual complicated wastewater. Here, a Ag/α-Fe 2 O 3 heterostructure anchored copper mesh was intentionally synthesized using a facile two-step hydrothermal method. The resultant mesh with superhydrophilicity and underwater superoleophobicity was capable of separating various oil/water mixtures with superior separation efficiency and high permeation flux driven by gravity. Benefiting from the joint effects of the smaller band gap of Ag/α-Fe 2 O 3 heterojunction, inherent antibacterial capacity of α-Fe 2 O 3 and Ag nanoparticles, favorable conductive substrate, as well as the hierarchical structure with superwettability, such mesh presented remarkably enhanced degradation capability toward organic dyes under visible light irradiation and antibacterial activity against both Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) compared with the pure α-Fe 2 O 3 coated mesh. Impressively, the mesh exhibited bifunctional water purification performance, in which organic dyes were eliminated simultaneously from water during oil/water separation in one filtration process. More importantly, this mesh behaved exceptional chemical resistance, mechanical stability and long-term reusability. Therefore, this material with multifunctional integration may hold promising potential for steady water purification in practice.
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