SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2018
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IF 2.88
Zhenxing Qin,Wenhai Wang,Xiaozhi Zhan,Xiujuan Du,Qingmei Zhang,Rui Zhang,Kun Li,Jinhong Li,Weiping Xu
Luminescent carbon-based nanoparticles , named often as carbon dots (CDs), were synthesized from citric acid (CA) and guanidine thiocyanate (GITC) via an N and S co-doped hydrothermal procedure. In the present structure characterization, N and S elements could be sufficiently doped by means of the heteroatom or the functional groups bonded on the surface of CDs. The as-prepared CDs solution showed blue color fluorescence under ultraviolet excitation, yet the PL spectra exhibited a repetitive emission process from excitation-independent to excitation-dependent. In view of the triexponential feature of fluorescence lifetimes of CDs, one possibility was proposed to be co-existence of two types of CDs with different surface states. Additionally, the as-prepared CDs were used as a sensing probe for the detection of Ag + taking into consideration of the possible interactions between Ag + and various fluorophores attached to the CD surface. As expected, the changes of fluorescence intensities were linearly proportional to the different concentration ranges of Ag + , which suggests the complex nature of the quenching mechanism. And for the first time, the S C N group was found to accelerate the quenching of CDs towards Ag + , promising a new approach for efficient detection of Ag + for the application in industrial pollutants.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
·
IF 4.084
Chunpeng Bai,Jingce Bi,Junbiao Wu,Yan Xu,Sebastian Wohlrab,Yide Han,Xia Zhang
In this work, a series of Ag/AgX (X = Cl, Br, I)/g-C 3 N 4 (Ag/AgX/CN) composites were successfully fabricated by an in-situ solid phase method. The morphology and structure, photoluminescence and photoelectrochemical properties of composites were investigated in detail. The as-prepared Ag/AgX/CN composites were used as H 2 evolution photocatalysts under visible-light irradiation with a sacrificial agent . The experimental results revealed that Ag/AgI/CN-4 composite possesses highest-H 2 evolution rate (up to 59.22 μmol g −1 h −1 ) which are approximately 31 times higher than that of pure g-C 3 N 4 (1.94 μmol g −1 h −1 ). In addition, Ag/AgCl/CN-4 and Ag/AgBr/CN-4 composites also present high photocatalytic activities yielding, 26.39 and 18.05 μmol H2 g −1 h −1 , respectively. The enhanced photocatalytic activities of Ag/AgI/CN-4 composite might be attributed to the synergistic effect between Ag/AgI nanoparticles and g-C 3 N 4 and the localized surface plasmon resonance effect of metallic Ag. Moreover, Ag/AgI/CN-4 composite showed excellent recyclability and stability after five cycling photocatalytic tests (about 25 h). Furthermore, the possible photocatalytic mechanism of Ag/AgI/CN composites is proposed.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Jing Wang,Tianli Yang,Ren He,Kehui Xue,Renrui Sun,Wenlei Wang,Juntao Wang,Ting Yang,Yuanlan Wang
Ternary heterostructure nanotubes of In 2 S 3 -CdIn 2 S 4 @X(X = Ag, Ag 3 PO 4 , AgI) were synthesized with enhanced photocatalytic activity for efficiently degrading pollutants. Electron beam irradiation was employed to artificially introduce interface defects to the heterostructure nanotubes. The experimental results for degrading carmine and Cr 6+ under visible light irradiation showed that the photocatalytic efficiency of In 2 S 3 -CdIn 2 S 4 was improved to some extent by the introduction of silver compounds. DRS results confirmed that the band gaps of In 2 S 3 -CdIn 2 S 4 were reduced to 1.62 eV and 1.58 eV by introducing Ag 3 PO 4 and AgI, respectively. Interestingly, the band gap of In 2 S 3 -CdIn 2 S 4 @AgI after electron beam irradiation was further reduced to 1.56 eV, resulting in that the degradation time of both Cr 6+ and carmine by In 2 S 3 -CdIn 2 S 4 @AgI after high-energy electron beam irradiation was shortened to only 5 min. The XRD spectra of the photocatalysts after five cycles could maintain the original crystal form to a large extent. The O H stretching vibration peaks of In 2 S 3 -CdIn 2 S 4 @AgI after electron beam irradiation at 3387 cm −1 became wider and sharper, thus indicating that the number of free hydroxyl groups on the heterostructure surface significantly increased. PL results showed that electron beam irradiation could significantly reduce the PL emission peak and enhance the utilization of photogenerated charge carriers. EIS results further confirmed that In 2 S 3 -CdIn 2 S 4 @AgI processed by electron beam irradiation had higher photogenerated electron-hole separation efficiency. Based on the experimental results, a feasible reaction pathway and photocatalytic mechanism for the degradation of carmine was investigated. ESR results showed that the main active groups in the whole photocatalytic system were •O 2 – and h + .
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MICROCHEMICAL JOURNAL
·
2024
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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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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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CARBON
·
2015
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IF 6.196
Jizhou Jiang,Lihua Zhu,Jing Zou,Lei Ou-yang,Anmin Zheng,Heqing Tang
Surface-enhanced Raman scattering (SERS) substrates with high SERS activity and stability are important for SERS sensors. A facile method was developed to fabricate efficient and stable SERS substrates by combining Ag nanoparticles (NPs) and micro-scale sheeted graphitic carbon nitride (g-C 3 N 4 ). The g-C 3 N 4 /Ag NPs hybrid could provide a great number of hot spots and concentrated the analyte by the π–π stacking interaction between analyte molecules and g-C 3 N 4 , making a dramatic Raman enhancement. Moreover, the g-C 3 N 4 /Ag NPs hybrid uniformly immobilized Ag NPs on the surface and edges of g-C 3 N 4 sheets by an interaction between Ag NPs and g-C 3 N 4 , leading to much improved long-term stability. This could be explained in terms of the electron–donor effect of g-C 3 N 4 , which was further confirmed by density functional theory calculations. The inherent Raman enhancing effect of g-C 3 N 4 itself also contributed to the total SERS responses. Due to multiple enhancement contributions, the g-C 3 N 4 /Ag NPs hybrid exhibited a strong Raman enhancement effect for with an enhancement factor of 4.6 × 10 8 (evaluated by using crystal violet as a probe), and possessed wide adaptability from dyes, pesticides to bio-molecules.
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BIOSENSORS & BIOELECTRONICS
·
2017
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IF 7.78
Nan Hao,Rong Hua,Saibo Chen,Ying Zhang,Zhou Zhou,Jing Qian,Qian Liu,Kun Wang
In this study, Ag/TiO 2 /3D nitrogen doped graphene hydrogel (3DNGH) was prepared for the first time and the photocurrent intensity of this material was greatly enhanced, which was attributed to the multiple enhancements accomplished in one step. The porous structure of 3DNGH could provide an exceptionally large accessible surface area, which was beneficial for the anchoring of Ag and TiO 2 nanoparticles . The introduction of nitrogen doped graphene and metal nanoparticles was capable to facilitate the charge separation efficiency and accelerate the transfer rate of the photogenerated electron-hole pairs. Then the photoelectrochemical performance was further amplified by the localized surface plasmon resonance of Ag nanoparticles. On the basis of excellent PEC properties of Ag/TiO 2 /3DNGH, a sensitive label-free PEC sensor has been established for the determination of thrombin successfully. This proposed PEC biosensor exhibited good PEC performances with a wide linear in the range from 0.01 p.M. to 10 p.M. as well as a relative low detection limit of 3 fM (S/N = 3), indicating that Ag/TiO 2 /3DNGH would serve as a promising photoactive material in the applications of PEC biosensors.
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ULTRASONICS SONOCHEMISTRY
·
2017
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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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Analytical Methods
·
2015
·Vol. 7
·期 15
·6103-6108
·
IF 1.821
Yuling Hu,Dongmei Wang,Gongke Li
Inspired by the bioadhesive and redox properties of the 3,4-dihydroxy-phenylalanine (DOPA) contained in marine mussels, a facile, rapid and economic colorimetric strategy for Hg2+ detection was developed. The abundant catechol chains on the surface of Ag@DOPA can reduce Hg2+ to Hg0 and form a Ag@DOPA@Hg nanostructure with the deposition of Hg0. The nanostructures of Ag@DOPA and Ag@DOPA@Hg were confirmed by X-ray photoelectron spectroscopy, transmission electron microscopy, elemental mapping and Fourier transform infrared spectroscopy. The formation of the Ag@DOPA@Hg nanostructure causes a change in the color of the Ag@DOPA colloids from golden yellow to purple blue, making it directly possible to detect Hg2+ using a colorimetric strategy within 5 minutes. With increasing concentrations of Hg2+ from 10 nM to 4 μM, the surface plasmon resonance absorbance peak of the Ag@DOPA colloids decreased in intensity and exhibited a good linear relationship with the Hg2+ concentration. The limit of detection was determined as 5 nM. Furthermore, this response was found to be highly selective for Hg2+ as the absorption spectrum was not affected by other metal ions such as Pb2+, Cr3+, Cu2+, Al3+, Ni2+, Co2+, etc. The excellent stability, selectivity and sensitivity of this strategy offer analytical practicability for Hg2+ detection in real water samples with recoveries in the range of 104–105% and cosmetic samples with recoveries in the range of 85–103%.
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Journal of Materials Chemistry A
·
2014
·Vol. 3
·期 8
·4307-4313
·
IF 0
Xianchun Liu,Renxi Jin,Dashu Chen,Lin Chen,Shuangxi Xing,Hongzhu Xing,Yan Xing,Zhongmin Su
In this study, we report a simple in situ auto-reduction strategy for the fabrication of Ag@FDU-15 nanocomposites, in which the small sized Ag nanoparticles are monodispersed in the channels of FDU-15 ordered mesopolymers. The as-prepared Ag@FDU-15 nanocomposites were characterized by small and wide angle X-ray diffraction (XRD), nitrogen sorption, thermo-gravimetric analysis (TGA), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM). TEM results show that the silver nanoparticles are uniformly dispersed with a mean diameter of 5.6 ± 0.5 nm. When used as a hydrogenation catalyst, the Ag@FDU-15 nanocomposites exhibit excellent catalytic performance and reusability for the reduction of 4-nitrophenol (4-NP) in the presence of NaBH4.
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CARBOHYDRATE POLYMERS
·
2015
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IF 4.074
Zidan Zhou,Xinwen Peng,Linxin Zhong,Lan Wu,Xuefei Cao,Run Cang Sun
Electrospun cellulose acetate (CA) membrane was employed as a support that provided sites for AgCl crystals in situ growth. The Ag@AgCl crystals on electrospun CA composites with exposed {1 0 0} and {1 1 1} facets were fabricated at room temperature by a double diffusion technique. The crystal structure, morphology, composition, and absorption light ability of CA supported Ag@AgCl were characterized utilizing X-ray powder diffraction (XRD), scanning electron microscopy (SEM), attenuated total reflection-infrared intensity (ATR-IR), X-ray photoelectron spectroscopy measurements (XPS), energy dispersive spectrometer (EDS) and ultraviolet–visible (UV–vis) diffuse reflectance spectra, respectively. The photocatalytic activity of the catalysts was evaluated using methyl orange (MO) as a target. The CA supported cubic Ag@AgCl catalyst exhibited much higher catalytic activity than octahedral catalyst in terms of the degradation of MO under visible light. The 10 mg CA based cubes could completely degrade MO (10 mg L −1 ) in 160 min. The photocatalyst still exhibited a good catalytic ability after three times.
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