MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 3
·1-10
·
IF 5.705
Li Hongji,Wang Xiaonan,Wang Zirun,Wang Yan,Dai Jiangdong,Gao Lin,Wei Maobin,Yan Yongsheng,Li Chunxiang
A new method is described for the determination of the pesticide λ-cyhalothrin (LC). It combines SERS detection with molecular imprinting and largely improves selectivity. A multilayer surface imprinted nanocomposite was synthesized in two steps on a nanostructure of type SiO 2 @rGO@Ag acting as a substrates. Firstly, the surface of the SiO 2 @rGO@Ag composite was modified with self-polymerized dopamine. Secondly, surface-initiated polymerization was carried out to prepare a molecularly imprinted polymer (MIP) using LC as the template. The use of this SiO 2 @rGO@Ag-MIP allows for excellent SERS based detection and has high selectivity for LC. The Raman intensity and LC concentration present perfect linear relationship between 10 −5 to 10 −9 mol L −1 and the detection limit is 3.8×10 −10 mol L −1 . All the procedures are conducted in aqueous or ethanol solution.
Schematic of a new method for determination of the pesticide λ-cyhalothrin. It combines SERS detection with molecular imprinting and largely improves selectivity. A multilayer surface imprinted nanocomposite was synthesized in two steps on a nanostructure of type SiO 2 @rGO@Ag acting as a substrates.
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Nanoscale
·
2018
·Vol. 10
·期 15
·6892-6899
·
IF 7.233
Zhiqiang Cheng,Shengzhe Zhao,Lihao Han
A novel method for synthesizing ZnO/γ-Al2O3 nanofibers by electrospinning and subsequent calcination is reported. The prepared nanofibers were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The ZnO/γ-Al2O3 nanofibers exhibited excellent capacity for adsorbing organics with a negative zeta potential such as methyl orange (95.8%) and heavy metal ions such as Cr(VI) in aqueous solution. The mechanism of adsorption was investigated, and the adsorption results were fitted using the Langmuir and Freundlich models. Once silver nanoparticles (Ag NPs) were decorated on the surface of the nanofibers by photoreduction, the Ag/ZnO/γ-Al2O3 nanofibers manifested efficient photocatalytic degradation of methyl orange under UV-light illumination. Results confirmed that our Ag/ZnO/γ-Al2O3 nanofibers are a promising adsorbent for the removal of methyl orange and Cr(VI) ions and the adsorbent can be sustainably reused.
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Feina Niu,Panpan Jiang,Lei Wang,Yawen Gao,Hong Zhu,Nan Gao,Zhiwei Cai,Hanping He,Yunbin He,Gang Chang
Raman studies have consistently emphasized the precise detection of target analytes by strategically manipulating the morphology and structure of noble metal nanomaterials. In this study, the nanorods with Ag shell and Au nanobipyramid core (Au NBPs@Ag) were designed and prepared through the weting chemcial method. The length of the nanorods can be adjusted from 131 ± 8 nm to 165 ± 23 nm by controlling the amount of Ag precursor, while keeping their width constant. According to the size of Au NBPs@Ag nanorods, surface-enhanced Raman scattering (SERS) performance would change significantly, and the optimal signal response was achieved when the aspect ratio of Au NBPs@Ag nanorods was 4.43. This can be due to the synergistic effect of gold core and silver shell changed by nanorods morphology, which further affected SERS performance. Moreover, Au NBPs@Ag modified polydimethylsiloxane (PDMS) flexible substrate was developed through interface self-assembly technology, allowing for sampling on irregular surfaces. The flexible SERS substrate was successfully applied to detect malachite green in contaminated river bass with wide linear range from 0.1 nM to 10 μM and detection limit of 0.1 nM. These results indicated that Au NBPs@Ag nanorods SERS substrate had great potential in the rapid trace detection of environmental detection and food safety.
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Mei Sun,Ke Chen,Hanmei Hu,Ping Chen,Mingdi Yang,Haiou Zhou,Han Xuan
Electrically modulated surface-enhanced Raman scattering (E-SERS) enhances Raman signals by adjusting the plasmon resonance of noble metal nanostructures with an electric field. However, traditional E-SERS substrates require complex electrochemical setups, limiting portability. Piezoelectric materials, which generate surface charges under external forces, present a promising alternative. This study develops a novel self-powered E-SERS substrate by embedding piezoelectric material 0.5Ba(Zr 0.2 Ti 0.8 )O 3 -0.5(Ba 0.7 Ca 0.3 )TiO 3 (BZT-BCT) in polyvinylidene difluoride-hexafluoropropylene (PVDF-HFP) matrix combined with silver nanoparticles. Experiments with nanogenerator piezoelectricity reveal that pressing the substrate with a finger generates current and voltage, providing an electric field for SERS enhancement. Gradual addition of weights on the substrate significantly boosts Raman signals of molecules like p-aminothiophenol (PATP), crystal violet (CV), thiram, and methyl bromide (MB). The synergy of piezoelectric effect and localized plasmon resonance achieves high sensitivity, reproducibility, and detection limits down to 10 −9 M, with an enhancement factor of 10 9 . Moreover, the sensor effectively detects trace MB veterinary drug residues in fish meat and thiram pesticide residues on apple skin, introducing a new self-powered E-SERS platform for sensitive food contaminant detection.
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NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Zheng Nie,Xinyi Li,Fangjun Wu,Fujie Lai,Xudong Yang,Shaoyang Chen,Chao Yan,Yang Wang
The construction of heat transfer channels based on highly thermally conductive fillers in a polymer matrix is important for improving the thermal conductivity of thermal management materials (TMMs). However, owing to the inhomogeneity of filler distribution and the limitation of the mechanical properties of polymers, it is a great challenge to achieve both high thermal conductivity and excellent mechanical properties. In this work, a simple air/water interfacial (AWI) assembly was implemented for the preparation of boron nitride–silver nanowires/polyvinyl alcohol (BN–Ag NWs/PVA) films. BN–Ag NW hybrid fillers were obtained through the ultrasonic treatment of amino-functionalized BN flakes with an Ag NW solution, followed by drying. BN–Ag NWs/PVA composite films were prepared via AWI assembly on the surface of a saturated sodium sulphate solution based on the salting-out effect. BN flakes tended to be oriented and aligned along the in-plane direction, and Ag NWs could bridge different BN flakes to form thermal conductivity pathways. The in-plane thermal conductivity of the BN–Ag NWs/PVA film was 1.24 W m−1 K−1 at a filler content of 25 wt%, which was about 4.8 times higher than that of a pure PVA film. Meanwhile, the tensile strength of the BN–Ag NWs/PVA film could reach 54.3 MPa owing to the regular distribution of hybrid fillers. The simultaneous improvement of thermal conductivity and mechanical properties was beneficial for the practical application of BN–Ag NWs/PVA films.
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Nuclear Science and Techniques
·
2025
·Vol. 36
·期 2
·1-13
·
IF 3.8
Xu Si-Yi,Li Dan-Yi,Wang Wen-Rui,Lin Lin,Sun Ying,Li Ji-Hao,Li Lin-Fan
High-performance MXene-based polymer nanocomposites are well-suited for various industrial applications owing to their excellent mechanical, thermal, and other properties. However, the fabrication of flame-retardant polymer/MXene nanocomposites remains challenging owing to the limited flame-retardant properties of MXene itself. This study prepared a novel MXene@Ag@PA hybrid material via radiation modification and complexation reaction. This material was used to further enhance the key properties of ethylene-vinyl acetate (EVA), such as its mechanical properties, thermal conductivity, flame retardancy, and electromagnetic shielding. The addition of two parts of this hybrid material increased the thermal conductivity of EVA by 44.2% and reduced its peak exothermic rate during combustion by 30.1% compared with pure EVA. The material also significantly reduced smoke production and increased the residue content. In the X-band, the electromagnetic shielding effectiveness of the EVA composites reached 20 dB. Moreover, the MXene@Ag@PA hybrid material could be used to further enhance the mechanical properties of EVA composites under electron-beam irradiation. Thus, this study contributes to the development of MXene-based EVA advanced materials that are fire-safe, have high strength, and exhibit good electromagnetic shielding performance for various applications.
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Min Wang,Yanling Chen,Yijin Huang,Li Hou,Shulin Zhao,Tianran Lin
In this study, Ag-CdIn 2 S 4 was selected as a photosensitive material and combined with the zeolite imidazole frame-90 encapsulated methylene blue (ZIF-90@MB) to establish a controlled release system. On that basis, a self-powered photoelectrochemical (PEC) aptasensor was constructed based on target responses to realize the highly sensitive detection of prostate-specific antigen (PSA). The self-powered sensing method was employed to effectively avoid interference from other oxidizing/reducing substances in the system and improve the accuracy of the detection method. The band gap of CdIn 2 S 4 was adjusted by Ag doping, and the visible light absorption capacity and photoelectric conversion efficiency of the material were improved by the local surface plasmon resonance (LSPR) effect of metal Ag. The ZIF-90 porous material was used as a carrier, the MB photosensitizer as a signal molecule was loaded in the ZIF-90 pore channel. The PSA aptamer (PApt) was attached to the ZIF-90@MB surface to form a simple biological gate. In the presence of the PSA, the recognition interaction between PApt and PSA made the biological gate open, then many MB molecules were released from ZIF-90 and enhanced the photocurrent signal. Under the optimal experimental conditions, the linear range of the sensor was 0.005 ∼ 50 ng mL −1 , and the detection limit was 2.35 pg mL −1 . The accurate determination of PSA in human serum was achieved, which provided a novel sensing strategy for the early diagnosis of clinical biomarkers.
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TALANTA
·
2024
·
IF 5.6
Yueshou Zhang,Lichun Yang,Yulin Xu,Haiting Ren,Shi Yin,Yan Sun,Yongjun Hu
Rapid and sensitive detection of phosphate is of great significance for ensuring water safety and preventing eutrophication. In this study, we prepared Au@PATP@Ag NRs core-shell structures using 4-aminothiophenol (PATP) as an internal standard signal molecule to enhance the stability of the SERS signal. Based on the phosphate-induced decomposition of ZIF-8 and the protective effect of ZIF-8 on the internal Au@PATP@Ag NRs, a phosphate SERS sensor (Au@PATP@Ag@ZIF-8) with high sensitivity, selectivity and stability was designed. This method exhibited a good linear range of 0.1–125 μM and a detection limit of 30 nM. Furthermore, the developed sensor (Au@PATP@Ag@ZIF-8) was effectively applied to assess PO 4 3− in tap water samples, achieving recoveries between 97.44% and 104.54%. With its simple, fast and sensitive features, this method of phosphate detection in water provides a direction for the research and practical application of phosphate detection.
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DESALINATION
·
2024
·
IF 8.3
Negar Yousef Tizhoush,Samira Jabbarvand Behrouz,Vahid Vatanpour,Yasin Orooji,Alireza Khataee
Developing high-performance nanofiltration membranes for treating wastewater contaminated with organic pollutants requires special attention. The toxic nature and side effects of organic pollutants, such as dyes and antibiotics, make them hazardous. Therefore, wastewater containing organic pollutants must be treated properly before entering water environments. Herein, we synthesized the Ti 3 SiC 2 MAX phase via the reactive sintering technique. To make the Ti 3 SiC 2 more hydrophilic and compatible with the polyethersulfone (PES) membrane, its surface was modified in one step with Ag NPs/polyvinyl alcohol (Ag-MAX). Different quantities (0–1 wt%) of Ag-MAX filler were embedded into the PES membrane via the phase inversion process. The presence of 0.75 wt% Ag-MAX filler enhanced hydrophilicity, porosity, surface roughness, pore size, and negative charge of PES membrane, which are beneficial for permeance and antifouling features of Ag-MAX mixed matrix membranes (MMMs). The optimized membrane containing 0.75 wt% of Ag-MAX demonstrated the uppermost pure water flux of 72.5 L/m 2 h with a flux recovery ratio of 82.8 %. The optimized membrane showed rejection efficiency of 99.4, 99.6, and 99.7 % for Direct Black 38, Acid Blue 113, and Disperse Red 153 dye solutions, along with a satisfactory rejection of 70.7, 65.9, and 58.5 % for Basic Violet 1, Alizarin Red S, and Ceftriaxone solutions, respectively. Furthermore, the effects of various pH values, various salt types, and cyclic filtration experiments on the separation performance of 0.75 wt% Ag-MAX MMM were investigated. The rejection efficiency of 0.75 wt% Ag-MAX MMM toward Acid Blue 113 is almost constant and higher than 98.5 % in different conditions, demonstrating that the Ag-MAX MMM could be a suitable candidate for the treatment of wastewater contaminated with organic pollutants.
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TALANTA
·
2025
·
IF 6.1
Gao-Feng Wu,Jian Zhu,Guo-Jun Weng,Jian-Jun Li,Jun-Wu Zhao
To enhance the efficacy of Surface-enhanced Raman spectroscopy (SERS), noble metal nanoparticles (NMNPs) can be organized onto three-dimensional (3D) hierarchical nanostructures. This study involved constructing a 3D solid SERS substrate by layering Au–Ag core-satellite nanoparticle monolayer films (MF) on a polystyrene sphere (PS) array, termed Au–Ag core-satellite NPs-MF-PS. Optimizing the PS size was essential to maximize SERS substrate activity, with the 500 nm PS providing the best SERS enhancement factor of 1.03 × 10 7 a two-fold increase over Au–Ag core-satellite NPs MF alone. Additionally, cotinine detection was improved by using a ratio between the target molecules and internal Raman signals from the SERS substrate. Compared to conventional methods relying on the target molecule's Raman signal, this ratiometric SERS method expanded the detection range from 10 −8 - 10 −1 M to 10 −9 - 10 −1 M and reduced the detection limit from 3.67 × 10 −9 M to 1.68 × 10 −10 M. This approach represents a novel direction in creating ultra-sensitive SERS platforms with broad applications, suggesting that ratiometric SERS could further promote SERS technology advancements.
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ULTRASONICS SONOCHEMISTRY
·
2017
·
IF 4.218
Hongjun Ji,Junbo Zhou,Meng Liang,Huajun Lu,Mingyu Li
Sintering of low-cost Cu nanoparticles (NPs) for interconnection of chips to substrate at low temperature and in atmosphere conditions is difficult because they are prone to oxidation, but dramatically required in semiconductor industry. In the present work, we successfully synthesized Cu@Ag NPs paste, and they were successfully applied for joining Cu/Cu@Ag NPs paste/Cu firstly in air by the ultrasonic-assisted sintering (UAS) at a temperature of as low as 160 °C. Their sintered microstructures featuring with dense and crystallized cells are completely different from the traditional thermo-compression sintering (TCS). The optimized shear strength of the joints reached to 54.27 MPa, exhibiting one order of magnitude higher than TCS at the same temperature (180 °C) under the UAS. This ultra-low sintering temperature and high performance of the sintered joints were ascribed to ultrasonic effects. The ultrasonic vibrations have distinct effects on the metallurgical reactions of the joints, resulting in the contact and growth of Cu core and the stripping and connection of Ag shell, which contributes to the high shear strength. Thus, the UAS of Cu@Ag NPs paste has a great potential to be applied for high-temperature power device packaging.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2017
·Vol. 33
·期 3
·507-512
·
IF 1.024
Guo Zhuo,Luo Xianke,Li Yahui,Li Dongdi,Zhao Qinai,Li Mengmeng,Ma Chi,Zhao Yanting
An electrochemical method for simultaneous determination of ascorbic acid(AA), dopamine(DA) and uric acid(UA) was developed based on RGO-Ag/PANI modified glassy carbon electrode(RGO-Ag/PANI/GCE, RGO= reduced graphene oxide, PANI=polyaniline). Owing to the synergetic effect among RGO, Ag and PANI, the RGO-Ag/PANI based sensor not only improved the electrochemically catalytic oxidation of AA, DA and UA, but also resolved the overlapping anodic peaks. Under the optimized conditions, the calibration curves were obtained in the concentration ranges of 50—1000, 5—200 and 20—350 μmol/L, and the detection limits(S/N=3) of 0.5, 0.2 and 0.2 μmol/L were obtained for AA, DA, and UA, respectively, in neutral phosphate buffer solutions(PBS). The RGO-Ag/PANI/GCE sensor was successfully applied to the determination of AA, DA, and UA in bovine serum samples and showed high selectivity, sensitivity, and reproducibility.
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