SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Xinke Wang,Xia Gao,Xiaodong Lin,Shuo Zheng,Yong Yan,Shuo Wang,Yaqing Liu
Silver ion pollution is a great threat to global environment and public healthcare today. Thus, quick, portable and sensitive assays for Ag + tracing are highly needed. Herein, a reliable fluorescent and colorimetric dual-channel assay has been constructed for Ag + detection by utilizing a terbium-based fluorescent nanomaterial (named as Tb-DPA) and a Pt/Pd nanoflower (Pt/Pd NF)-triggered reaction between N-ethyl-N-(3-sulfopropyl)-3-methylaniline sodium salt (TOPS) and 4-amino-antipyrine (4-AAP). Initially, in the sensing system containing 4-AAP, TOPS, Tb-DPA and Pt/Pd NF, TOPS and 4-AAP is catalyzed by Pt/Pd NF to produce a purple compound (called as PC1), which endows a broad UV absorption that can fully cover the emission band of Tb-DPA. Thus, the system exhibits a high UV absorption (originating from PC1) and a low fluorescence intensity (originating from Tb-DPA) which has been quenched by PC1 through a filtering effect. However, when the system meets Ag + , the oxidase-like activity of Pt/Pd NF will be inhibited, leading less amount of PC1. As a result, the system exhibits a decreased UV absorption and a recovered fluorescence intensity, both of which can be used for Ag + detection, reporting low detection limits of 3.63 nM and 1.63 nM, respectively. Specially, results from the dual-channel assay can mutually validate each other, improving the detection reliability. Moreover, this dual-mode assay shows good capability toward Ag + detection in real samples, illustrating the potential for practical applications.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2013
·
IF 2.112
Hao Zhou,Yunfang Liu,Weidong Chi,Changyuan Yu,Yingjie Yu
Immobilization of silver nanoparticles (Ag NPs) on poly-dopamine (PDA) functionalized graphene oxide sheets (GOSs) were carried out by an easy in situ reduction method. The PDA layer was coated on the surface of the GOSs via the self-polymerization of dopamine under atmosphere condition. The PDA layer not only works as the chemisorption and reduction sites for silver ions to form Ag NPs but also stabilizes them. High-resolution transmission electron microscopy observation shows that the average size of the Ag NPs anchored on the PDA/GOS composite is about 2.8 nm. The inhibition zone diameter of the Ag@PDA/GOS nanocomposite is about 23.7 mm, whereas said diameter of the Ag NPs is only 18.5 mm. The minimum bactericidal concentration of the Ag@PDA/GOS nanocomposite is about 25 μg/ml that is only half of said concentration of the Ag NPs. The Ag@PDA/GOS nanocomposite exhibits an excellent antibacterial property.
研究领域:
材料科学
·
微生物学
✓ 已验证
DOI
高影响因子
Materials Research Express
·
2020
·Vol. 7
·期 8
·085403
·
IF 1.929
Yanqin Xu,Jie Liu,Shumin Guan,Aotong Dong,Yuan Cao,Changguo Chen
pH-sensitive Ag/AgO/carboxymethyl chitosan (CMCS) bacteriostatic hydrogels and Ag/AgO/CMCS/Aspirin (ASP) carrier hydrogels were prepared by Ag/AgO in situ precipitation method, and the effects of swelling, degradation, drug release and antibacterial properties of hydrogels were studied. The network of Ag/AgO/CMCS/ASP drug-loaded gels produced was mainly cross-linking by hydrogen bonding and intermolecular forces, and the cross-linking silver was mainly present in the elemental Ag and Ag2+ states. Under the condition of buffer solution pH = 7.4, the cumulative release amount of Ag/AgO/CMCS/ASP drug-loaded gel was 75.20% within 12 h, and the inhibition rate of Gram-negative Escherichia coli (E. coli) reached the maximum of 92.32%, which had broad application prospects in the medical field.
研究领域:
材料科学
·
药学
·
生物医学工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 37
·21845-21851
·
IF 3.119
Shulin Chen,Chen Ding,Yong Lin,Xinzhou Wu,Wei Yuan,Xiuqing Meng,Wenming Su,Ke-Qin Zhang
Here we demonstrate a novel SERS-active substrate assembled by silver nanowire (Ag NW)-embedded porous polystyrene (PS) fibers. Ag NWs are synthesized through a glycerol-mediated solvothermal method firstly, then electrospun into PS porous fibers. The as-synthesized Ag NWs are embedded in PS fiber and aligned orderly along the axial direction. Porous structure appears in PS fiber due to the phase separation induced by rapid evaporation of solvents. Large amounts of holes not only greatly improve the sample collection efficiency of the SERS-active substrate, but also significantly facilitate the adsorption of target molecules on the surface of Ag NWs, thus increasing the probability of enhancement of target molecules. In addition, compared with polyvinyl alcohol (PVA) and polyvinyl pyrrolidone (PVP), PS has better solvent resistance. The detection limit of 4-aminothiophenol (4-ATP) on our fabricated electrospun fiber mats is 10−7 M, and the electrospun fiber mats showed good reproducibility of SERS signal detection. This study proposes a feasible strategy for the large-scale preparation of flexible SERS-active substrate assembled by Ag NW-embedded porous PS fibers. The produced flexible SERS substrates may have potential application in wearable sensors for the trace detection of chemical and biological molecules.
研究领域:
材料科学
·
纳米技术
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 6
·3059-3066
·
IF 3.591
Zhiwen Pan,Junqi Yang,Weijia Song,Puqiang Luo,Junyan Zou,Jie Peng,Bo Huang,Zhi Luo
This paper reports a two-step seed-mediated synthesis of gold core@silver shell nanoparticles (Au@Ag NPs). The plasmonic properties of Au@Ag NPs were controlled through the etching effect of H2O2 generated from the oxidation of glucose. Therefore, we used Au@Ag NPs as surface-enhanced Raman scattering (SERS) substrates and 4-mercaptobenzoic acid (4-MBA) as the Raman tag to detect glucose concentration. This method exhibits a rapid detection process (5 min), a determination range from 10−1 M to 10−6 M and a detection limit of 10−6 M, which indicate that Au@Ag NPs can serve as sensitive SERS sensors for clinical detection of blood sugar.
研究领域:
生物传感
·
医学诊断
·
纳米技术
✓ 已验证
DOI
高影响因子
Nanoscale Research Letters
·
2012
·Vol. 7
·期 1
·1-6
·
IF 2.726
Sun Li,Luan Weiling,Shan Yue Jin
A capillary micro-reaction was established for the synthesis of Au-Ag alloy nanoparticles (NPs) with a flexible and controllable composition and grain size by tuning the synthesis temperature, the residence time, or the mole ratio of Au 3+ :Ag + . By extending the residence time from 5 to 900 s, enhancing the temperature from 120°C to 160°C, or decreasing the mole ratio of Au 3+ :Ag + from 1:1 to 1:20, the composition of samples was changed continuously from Au-rich to Ag-rich. The particles became large with the increase of the residence time; however, synthesis temperatures showed less effect on the particle size change. The particle size of the Au-Ag alloy NPs with various composition could be kept by adjusting the mole ratio of Au 3+ :Ag + . TEM observation displayed that the as-obtained NPs were sphere-like with the smallest average size of 4.0 nm, which is half of those obtained by the traditional flask method.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2013
·Vol. 16
·期 1
·110-115
·
IF 3.879
Zhenglin Zhang,Haiyan Song,Shishu Zhang,Junyan Zhang,Wenya Bao,Quanqin Zhao,Xiang Wu
Epichlorohydrin (ECH) is mainly an industrial raw material, while it is toxic and dangerous for human health, so finding a simple and effective method for detecting ECH gas is challenging work. Porous SnO2 structures are successfully obtained through a hydrothermal method using SnCl4·5H2O as the tin source and water as the solvent. Ag nanoparticle (NPs) decorated porous SnO2 structures have also been prepared by the impregnation method. The morphology and structure of the as-prepared products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and the nitrogen adsorption–desorption technique. The as-synthesized nanostructures, with diameters ranging from 4–5 μm, are composed of porous nanosheets with an average thickness of 60 nm. The gas sensing properties of the Ag NPs decorated porous SnO2 structures for ECH gas were investigated in detail, and the results showed that the 10% Ag NPs decorated porous SnO2 structures gas sensor was the optimum sensor, demonstrating a response (S = 50) for 100 ppm of ECH gas, while the working temperature was decreased by about 180 °C. In addition, it showed a low detection level (0.5 ppm) for ECH gas, good reproducibility and repeatability, and long-term stability, implying a promising application in detecting ECH gas.
研究领域:
材料科学
·
环境科学
·
纳米技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 24
·12845-12851
·
IF 7.443
Ling Lin,Gui-Qi Gao,Qing Zhu,An-Wu Xu
Plasmon hot electron injection enhanced photocurrent has potential applications in light harvesting in photovoltaic devices. We demonstrate a cathodic photocurrent enhancement system utilizing strongly coupled Ag@perylene (Ag@Pe) core–shell nanowires, and the perylene shell thickness can be readily controlled. The strong coupling between the plasmonic resonance and molecular exciton resonance is evidenced by the substantial plasmon damping of Ag NWs and the enhancement of fluorescence of perylene with a red shift in Ag@Pe samples. The photocurrent of the Ag@Pe sample with a shell thickness of 5.8 nm (Ag@Pe-5.8 nm) shows a 16-fold enhancement compared to that of perylene. While, a simply mixed Ag–perylene sample displays only a 6-fold enhancement in photocurrent, indicating that the strong coupling in the Ag@Pe system plays a major role in the enhancement of photocurrent through hot electron transfer from the silver nanowires to perylene molecules. This strongly coupled Ag@Pe hetero-nanostructure could find potential applications in surface plasmon-driven, hot-electron solar cells and surface catalytic reactions.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2016
·Vol. 294
·期 10
·1643-1649
·
IF 1.89
Zhang Rongli,Xu Sheng,Zhu Ye,Luo Jing,Liu Xiaoya,Tang Dingxing
A simple and facile method of Ag/dopamine modified poly(γ-glutamic acid) nanoparticles (Ag/γ-PGA-DA NPs) was conveniently achieved. By simply adding AgNO 3 to the aqueous solution of γ-PGA-DA copolymer, Ag + was adsorbed in the copolymer and spontaneously reduced to Ag NPs by the dopamine moieties of γ-PGA-DA, leading to the formation of Ag/γ-PGA-DA NPs. In the reaction process, γ-PGA-DA copolymer was used as stabilizer and reductant simultaneously, avoiding the use of extra toxic reducing reagents. The resultant Ag/γ-PGA-DA NPs were used to modify electrode through simple casting method and exhibited a good analytical performance for chloride ion. The Ag/γ-PGA-DA NPs modified electrode responded linearly to chloride ion in the concentration range of 1 × 10 −8 to 1 × 10 −3 mol L −1 . Compared to other published methods for chloride ion sensing, our prepared modified electrode had much wider detection range for chloride ion sensing.
研究领域:
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2021
·
IF 3.995
Yongbo Chen,Yi Zhou,Jin Zhang,Jiaxin Li,Tiantian Yao,Anna Chen,Zhiyue Chen
Construction of heterojunction is an effective way to improve the photocatalytic activity of photocatalyst . In this work, a simple precipitation method was adopted to anchor rod-like AgVO 3 on Bi 4 Ti 3 O 12 nanosheets to form heterojunction . The results show that Ag can act as an electronic medium to construct Z-scheme heterojunctions, that more visible light can be absorbed and facilitates the separation of electron hole pairs compared with the pure Bi 4 Ti 3 O 12 . The AgVO 3 /Bi 4 Ti 3 O 12 composites displayed superior photocatalytic photodegradation of tetracycline (TC) under visible irradiation (λ > 420 nm). 12%AgVO 3 /Bi 4 Ti 3 O 12 (AgVO 3 with the mass ratio of AgVO 3 /Bi 4 Ti 3 O 12 = 12%) showed the highest photocatalytic degradation efficiency, 57% of TC was degraded within 60 min which was the 9.5 times and 2.5 times higher than pure AgVO 3 and Bi 4 Ti 3 O 12 . The capture experiment results showed that ·O 2 − and h + are the main active radicals in the process of TC degradation. The improved photocatalytic activity is attributed to the construction of Z-scheme heterojunction , which leads to expand the light absorption range and efficient separation of photogenerated carriers. In addition, the mechanism of the photocatalytic degradation of antibiotics was proposed.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yan Liu,Qingzhao Li,Yuying Lei,Dingli Zhou,Wenwei Wu,Xuehang Wu
The key to practical applications of sodium (Na) metal batteries is to develop high-performance Na metal anode. However, the unstable electrode/electrolyte interface induced by the Na dendrite growth severely shortens the working life of Na metal anode. In this work, we have developed a facile method based on a replacement reaction to construct an Ag metal layer for Na metal electrodes. The presence of robust and sodiophilic Ag metal layer can guide the uniform plating and stripping of Na ions on the surface of Na metal anode and effectively suppress the Na dendrite growth. Benefiting from a stable electrode/electrolyte interface, the increase of interfacial resistance of the Ag-protected Na metal (Na@Ag) electrode is significantly lower than that of the bare Na electrode after repeated plating/stripping. As a result, the symmetric cell with two identical Na@Ag electrodes exhibits superior cycling stability with stable over-potentials for more than 1100 h at a current density of 1 mA cm −2 and good rate performance with an over-potential of 210 mV at a current density of 5 mA cm −2 compared to the symmetric cell with two identical bare Na electrodes. Moreover, the full cell with an NaTi 2 (PO 4 ) 3 (NTP) cathode and an Na@Ag anode maintains good cycling stability with a capacity retention of 93.8% after 600 cycles, while the Na||NTP full cell breaks down in the 243th cycle.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry B
·
2015
·Vol. 3
·期 48
·9295-9304
·
IF 4.726
Yi Xia,Chong Cheng,Rui Wang,Chuanxiong Nie,Jie Deng,Changsheng Zhao
A highly efficient, universal and convenient protocol is reported to fabricate antifouling, hemocompatible, and bactericidal membranes by physically blending antifouling nanogels and in situ silver nanoparticle immobilization. Firstly, nanogels are synthesized by one-step cross-linking co-polymerization of an antifouling monomer, poly(ethylene glycol) methacrylate (PEGMA), and an anchoring monomer, methylacrylic acid (MAA). Then, the nanogels are physically blended with a membrane matrix to generate nanogel embedded composite membranes. Finally, the in situ growth of silver nanoparticles in the composite membranes is successfully achieved by electrostatic adsorption of Ag+ ions and vitamin C reduction. The successful preparation of Ag-nanogel blended polymeric membranes has been confirmed by FTIR spectra and XPS patterns. The surface SEM images suggest that there are abundant Ag-nanogels embedded on the composite membrane surfaces. The cross-sectional SEM images give clear evidence that the Ag-nanogel immobilized composite membranes have well-maintained finger-like structure with increased porosity; meanwhile, the uniform distribution of the Ag-nanogels in the membrane matrix is confirmed by elemental EDX mapping. The systematic tests of water contact angle, static protein adsorption and ultrafiltration experiments indicate that the hydrophilicity, water flux, and antifouling properties of the composite membranes are substantially improved. More importantly, prolonged blood clotting time and suppressed platelet adhesion/activation indicate that the composite membranes have better blood compatibility and ultralow thrombotic potential. Bactericidal studies reveal that the modified membranes exhibit remarkable inhibition and killing capability toward both S. aureus and E. coli bacteria. The results reveal that robust antifouling, hemocompatible, and bactericidal composite membranes have been prepared via the proposed blending of nanogels and loading of Ag nanoparticles. This approach is believed to have great potential for fabricating various multifunctional membranes for industrial and clinical usage.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
·
膜技术
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）