BIOELECTROCHEMISTRY
·
2012
·
IF 3.759
Xiao Liu,Liqiang Luo,Yaping Ding,Zhangping Kang,Daixin Ye
A novel Au-nanoparticles/poly-eriochrome black T film modified glassy carbon electrode (AuNPs/PEBT/GCE) was constructed for the simultaneous determination of l -cysteine (L-Cys) and l -tyrosine (L-Tyr) by differential pulse voltammetry . Fourier transform infrared spectra and electrochemical impedance spectroscopy indicate that the PEBT film was successfully polymerized on the surface of GCE and the film efficiently decreased the charge transfer resistance value of electrode and improved the electron transfer kinetic between analytes and electrode. The scanning electron microscope image shows that the immobilized AuNPs were spherical in shape and enhanced the electrical conductivity of PEBT film. In addition, PEBT film increased the oxidation currents of analytes four times when compared to bare GCE, and the AuNPs separated the oxidation potentials of L-Cys and L-Tyr by 488 mV while bare GCE failed to resolve them. The amperometry results exhibit that the electrocatalytic currents increased linearly with L-Cys concentrations in the range 0.05–100 μM ( r = 0.9981), and the detection limits of L-Cys and L-Tyr were 8 nM and 10 nM ( S / N = 3), respectively. With high sensitivity and selectivity, the proposed electrochemical sensor provides a simple method for simultaneous determination of L-Cys and L-Tyr.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Hao Lu,Xinlei Yao,Jing Li,Shuiliang Yao,Zuliang Wu,Huanhuan Zhang,Hanghao Lin,Tomohiro Nozaki
Plasma-catalytic oxidation of particulate matter (PM) has potential applications for diesel exhaust cleaning. There is a grand requirement to explore the mechanism of carbonaceous PM oxidation for the development of plasma catalysts. Herein, Au/γ-Al 2 O 3 was used to catalyze the gasification of the graphitic carbon. A modified diffuse reflectance infrared Fourier transform spectrometer equipped with a mass spectrometer was originally utilized to in situ characterize the surface intermediates of graphite on Au/γ-Al 2 O 3 and the gaseous products during the discharges processes in the O 2 -He balanced gases. It was found that O atoms and O 3 play important roles in the formation of surface oxygen complexes (SOCs) and facilitate the gasification of SOCs to CO 2 in the presence of Au/γ-Al 2 O 3 . The findings are helpful to understand the plasma-catalytic oxidation mechanism of PM and further develop efficient plasma catalysts.
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BIOSENSORS & BIOELECTRONICS
·
2019
·
IF 9.518
Malik Saddam Khan,Hafsa Ameer,Asghar Ali,Romana Manzoor,Lei Yang,Ruiqing Feng,Na Jiang,Qin Wei
Herein, a highly efficient electrochemiluminescence resonance energy transfer (ECL-RET) immunosensor was established for ultrasensitive insulin detection. Silver/silver orthophosphate/graphene oxide composites (Ag/Ag 3 PO 4 /GO) were prepared as sensing platform for capture-antibody (Ab 1 ) incubation. Ag 3 PO 4 is a novel ECL donor whose emission could be remarkably enhanced by the synergetic assistance of GO with Ag NPs. Notably, GO presented excellent electrical conductivity and ultrahigh specific surface area to improve the loading capacity Ab 1 and Ag 3 PO 4 , and Ag NPs with fine biocompatibility and catalytic property could immobilize Ab 1 via Ag–N bond and further hasten the electron transfer to catalyze the generation of SO 4 •− radicals for boosting the ECL emission of donor. To establish a new ECL-RET system, Pd@Au core-shell nanoflower was prepared as a suitable ECL acceptor which could immobilize the detection-antibody (Ab 2 ). Due to the fine spectral overlap , Pd@Au nanoflower could significantly quench the ECL emission of Ag 3 PO 4 , causing distinct decreases in ECL intensity. The proposed ECL-RET immunosensor exhibited sensitive response to insulin in a linear range of 0.0001–80 ng/mL with a low detection limit of 0.02 pg/mL ( S/N = 3), it not only provides a reliable tool for insulin detection in diagnostics of diabetes, but also lights up a new avenue for designing effective ECL-RET pairs in bioanalysis .
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Xiaoliang Li,Jiangjiang Feng,Michal Perdjon,Rena Oh,Wei Zhao,Xiaoyang Huang,Shusen Liu
Au-Pd bimetallic nanoparticles immobilized on series of CeO 2 supports with different morphologies, e.g. , rod, cube, and polyhedrons were prepared through the deposition-precipitation method with a consequent investigation on their catalytic performances for benzyl alcohol oxidation in the absence of solvent. The experimental results exhibited that the morphology of CeO 2 has a markedly impact on the catalytic performance of Au-Pd/CeO 2 . In which Au-Pd supported on CeO 2 rod could achieve higher benzyl alcohol conversion than that supported on CeO 2 polyhedrons and CeO 2 cube, however, CeO 2 cube supported Au-Pd showed the highest selectivity towards the production of benzaldehyde. ICP-AES, XRD, Raman, N 2 -BET, TEM, HAADF-STEM, and XPS were conducted to characterize the catalysts. The results revealed that the excellent behavior of Au-Pd/CeO 2 -rod in benzyl alcohol oxidation was closely related with the smaller size of CeO 2 particle, the higher concentration of oxygen defects in support and the higher number of Ce 3+ and Pd 2+ species on the catalyst surface. The present study on the morphologies of CeO 2 support in solvent-free benzyl alcohol oxidation would offer a notable approach for the future catalyst design.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Ming Yan,Yilin Wu,Xinlin Liu
Herein, Au-TiO 2 nanocomposite photocatalysts were initially constructed through a three-step-synthesis strategy including the sodium citrate reduction method, sol-gel method and high-temperature hydrothermal method . After that, Au-TiO 2 /PVDF photocatalytic nanocomposite membranes with visible light response were synthesized by a phase conversion process, thereinto, the Au-TiO 2 nanocomposite and PVDF powder were mixed into casting solutions by physical blending. Various characterization methods, such as SEM, TEM , FTIR, XRD , XPS , WCA and UV-vis DRS , etc., were used to systematically characterize the micromorphology, structural composition, wettability and optical properties of different samples. The UV-vis DRS results showed that the as-prepared nano-Au doping structure effectively enhanced the utilization factor of visible light in the process of photocatalytic degradation. The antifouling results of BSA adsorption experiments showed that 0.3-Au-TiO 2 /PVDF composite membranes possessed good antifouling performance. By analyzing the regeneration stability experiments, it could be found that the 0.3-Au-TiO 2 /PVDF composite membranes also exhibited excellent regeneration stability and easy separation and recovery features. The photocatalytic degradation of different membranes under visible light was investigated with tetracycline. The results showed that the photocatalytic degradation rate of 0.3-Au-TiO 2 /PVDF nanocomposite membranes reached 75% within 120 min. Moreover, the first-order kinetic linear fitting showed that the k value of 0.3-Au-TiO 2 /PVDF composite membranes was 0.01212 min −1 , which was 2.7 times and 2.0 times higher than that of 0.1-Au-TiO 2 /PVDF and 0.5-Au-TiO 2 /PVDF composite membranes. That is to say, photocatalytic activity of 0.3-Au-TiO 2 /PVDF composite membranes were obviously improved.
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JOURNAL OF RAMAN SPECTROSCOPY
·
2021
·Vol. 53
·期 2
·211-221
·
IF 3.133
Nan Jia,Yinran Xiong,Ying Wang,Siqian Lu,Ruoqiu Zhang,Yan Kang,Yiping Du
A label-free and novel surface-enhanced Raman scattering (SERS) method has been studied to rapidly detect common fish pathogenic bacteria ( Escherichia coli , Vibrio anguillarum , Vibrio harveyi , Edwardsiella piscicida , and Pseudomonas plecoglossicida ). The marriage of magnetic nanospheres (Fe 3 O 4 ) with polyethylenimine (PEI) could trigger surface charge modifications of Fe 3 O 4 , making it effective to capture negatively charged bacteria. After the rapid bacterial capture procedure within 10 min, Au@Ag core-shell bimetallic nanoparticles served as hotspot providers to facilitate the enhancement of biological Raman signals. The results demonstrated that the minimum detection limit of E. piscicida could be as low as 10 5 cfu/ml. The peak intensity at 1628 cm −1 ( E. piscicida ) showed a linear relationship with the logarithm of the bacterial concentration ( R 2 = 0.997). A mimic test was conducted by spiking E. piscicida into tap water. Linear discriminant analysis (LDA) was also harnessed to classify different types of fish bacteria. And the positive rates of the training set and the prediction set were 100% and 80%, respectively. The whole experimental procedure only takes 20 min. This method opens a new avenue for the rapid detection and identification of fish pathogenic bacteria.
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APPLIED CATALYSIS A-GENERAL
·
2024
·
IF 4.7
Chenyang Zhao,Yujia Liu,Yupeng Tian,Yahui Li,Junjie Feng,Wei Xu,Ning Shi,Zhe Yang,Bing Sun
Direct epoxidation of propylene (C 3 H 6 ) with hydrogen (H 2 ) and oxygen (O 2 ) over Au/TS-1 catalyst was promising way for the synthesis of propylene oxide (PO). However, high selectivity of PO (>95 %) and conversion of C 3 H 6 (>5 %) cannot be achieved at the same time. The industrialization process was severely restricted. In this paper, Au/TS-1 catalysts were synthesized by deposition precipitation method with alkali metal promoter. And alkaline gases and silane coupling post-treatment were performed to promote the catalytic activity. The prepared samples exhibited a much better C 3 H 6 conversion (6.5 %) and PO selectivity (95.1 %) compared with general catalyst using normal synthetic technology. Cs 2 CO 3 was beneficial to increasing Au nanoparticles uptake efficiency. Both NH 3 and triethoxyvinylsilane post-treatment were good for smaller and more uniform loading of Au nanoparticles. The decreasing in surface hydroxyl density effectively alleviated the occurrence of PO ring opening isomerization. The increased hydrophobicity of TS-1 surface was conducive to the rapid desorption of generated PO and significantly increased PO selectivity. Multiple pretreatment was also favorable for extending the lifetime of Au/TS-1 catalyst.
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JOURNAL OF RAMAN SPECTROSCOPY
·
2019
·Vol. 50
·期 11
·1679-1690
·
IF 2.809
Hang Zhao,Wuliji Hasi,Nan Li,Xuanyu Sha,Siqingaowa Han
This paper reports a “bottom-up” substrate preparation method using a two-phase interface self-assembly technology that combines silver-coated gold core–shell nanorods with the thermally shrinkable polystyrene (TSP) support material for surface-enhanced Raman spectroscopy (SERS), that is, TSP-SERS substrate. The gold nanorods with long absorption wavelength were used as the core, and the silver shells were coated to obtain the core–shell nanostructures with a stronger resonance with the wavelength of the light source. The density of the nanostructures and numbers of “hot spots” within the light spot increased via the three-dimensional folding feature formed by thermal shrinkage. The combined effect of the two factors increases the enhancement factor by an order of magnitude to 10 7 after thermal contraction. The detection concentration of 4-mercaptobenzoic acid can reach 10 −9 M, and the maximum relative standard deviation is only 8.9%. In fact, the detection limit of benzimidazole on the surface of apple can reach 0.5 mg/L, and the recovery deviation is controlled within the range of 11.7%. The practical detection of benzimidazole pesticide residues showed that this method has wide application prospects in the detection of pesticide residues.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Shiyu Zhang,Aiguo Rao,Kai Lin,Qi Yao,Chunhui Niu,Lei Wang,Mingqing Yang,Xueqiong Bai,Yong Lv
Recently, the Fabry–Perot (F–P) cavity electrochromic devices, which are constructed by combining nano-size inorganic electrochromic material WO 3 and reflective metal layers, have attracted considerable attention due to their potentials in the fields of dynamic multicolor displays and active camouflage. However, in the few studies that have been reported, the peak reflectance of flexible F–P cavity multicolor electrochromic devices in the visible wavelength band is generally lower than 30 %, which limits their reflective display and camouflage effects in high-brightness environments. Thus, we have combined multicolor reflective electrochromic electrodes in WO 3 /Au asymmetric F–P nanocavity constructed by magnetron sputtering on a Nylon 66 porous substrate with a highly transparent UV-cured gel electrolyte and a PET plastic sealing procedure. As a result, a flexible and dynamic multicolor electrochromic skin with high reflectance (R max ＞50 %) and excellent flexibility (bending radius of 4 mm) has been fabricated. The WO 3 electrochromic layer at the top works as the dynamic dielectric layer in the broadband absorption Fabry–Perot cavity, and the inert metal Au layer at the bottom works as the reflective layer. The WO 3 /Au asymmetric F–P cavity can acutely capture the variation in optical constants of WO 3 due to the thickness change and electric-driven effects. This cavity facilitates the selective reflection and absorption of the energy distribution of the spectrum after the induced interferometric resonance. As a result, the cavity exhibits a rich array of structural colors, including ocher, taupe, yellow, orange, green, and violet. The electrochromic skin exhibits a fast switching time and maintains 99.43 % of the optical modulation amplitude (ΔR) after 110 coloring/bleaching cycles. It provides a potential option in the field of flexible high-brightness reflective displays and dynamic camouflage in the future.
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LANGMUIR
·
2020
·
IF 3.557
Dongjie Zhang,Rui Hao,Lingling Zhang,Hongjun You,Jixiang Fang
The absorption behavior between plasmonic nanostructures and a target molecule plays key roles in effective surface-enhanced Raman scattering (SERS) detection. However, for analytes with low surface affinity to the metallic surface, e.g., polycyclic aromatic hydrocarbons (PAHs), it remains challenging to observe the enhanced Raman signal. In this work, we reported a ratiometric SERS strategy for sensitive PAH detection through the surface functionalization of 3D ordered mesoporous Au nanoparticles (meso-Au NPs). By employing mono-6-thio-β-cyclodextrin (HS-β-CD) as capture ligands, the hydrophobic molecules, e.g., anthracene, could be effectively absorbed on the meso-Au NP surface via a host–guest interaction. Besides, a hydrophobic slippery surface is used as a concentrator to deliver and enrich the Au/analyte droplets into a small area. Consequently, the detection limits of anthracene and naphthalene are down to 1 and 10 ppb. The improved SERS enhancement is mainly ascribed to the host–guest effect of HS-β-CD ligands, large surface area and high-density of sub-10 nm mesopores of Au networks, as well as the enrichment effect of hydrophobic slippery surface. Moreover, the HS-β-CD (480 cm–1 band) could serve as an internal standard, leading to the ratiometric determination of anthracene ranging from 1 ppm to 1 ppb. The proposed surface modification strategy in combination with the hydrophobic slippery surface shows great potential for active capture and trace detection of persistent organic pollutants in real-world SERS applications.
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2019
·
IF 3.973
Qingmiao Zhang,Yilei Wang,Wenkun Zhang,Michael E. Hickey,Zhuangsheng Lin,Qin Tu,Jinyi Wang
Nanofibrous membranes which exhibit bacteriostatic functions are a good strategy to prevent microorganisms from adhering to the surface of biomaterials. Here, we report the synthesis of such a nanofibrous membrane which can be applied to biological coatings to reduce bacteriostatic functionality. Ascorbic acid was utilized to reduced chloroauric acid to gold nanoparticles (AuNPs). Dopamine was then polymerized upon AuNP surfaces by ultrasound-assistance, to synthesize core-shell structured polydopamine-coated AuNPs (Au@PDA NPs). The Au@PDA NPs were then mixed with polylactic acid (PLA) for electrospinning into cylindrical nanofibers (136.6 nm diameter). PLA-Au@PDA nanofibrous membranes were finally immersed in silver nitrate for in situ reduction into a silver nanoparticle (AgNP) coating to yield PLA-Au@PDA@Ag nanofibers. The PLA-Au@PDA@Ag nanofibers were characterized based on field emission scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and contact angle analyses. The antibacterial properties of the PLA-Au@PDA@Ag nanofibers were examined based on the optical density absorbance of bacterial cell suspensions, traditional colony plate counts, zone inhibition analyses, and field-emission scanning electron microscopy. Escherichia coli and Staphylococcus aureaus respectively served as Gram negative and positive bacterial models of industrial relevance. The data conclusively illustrates the antimicrobial and biomedical applications of PLA-Au@PDA@Ag nanofibers.
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JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Jun Wan,Yue Zhang,Ruimiao Wang,Lin Liu,Enzhou Liu,Jun Fan,Feng Fu
Developing and designing a rational heterojunction with efficient charge kinetics properties have been a research hotspot for improving photocatalytic performance. Herein, a surface plasmons coupled two-dimensional chemical Au/Bi 2 WO 6 -MoS 2 heterojunction was synthesized. In thus a system, Au nanoparticles are tightly attached to the sides of Bi 2 WO 6 nanosheets , conducting a HEI effect with additional visible light response to inject “hot electrons” into Bi 2 WO 6 , resulting in additional charge generation. Meanwhile, few-layer MoS 2 nanosheets were chemically assembled onto ultrathin Bi 2 WO 6 nanosheets via interfacial S O bonds to form a intimate 2D-2D nanojunction, the separated and injected electrons on the surface of Bi 2 WO 6 were further directional transfer to MoS 2 nanosheets through S O bonds for detoxification of heavy metal ions Cr(VI), and the corresponding holes left on Bi 2 WO 6 nanosheets were applied for simultaneous degradation of tetracycline antibiotic. The photocatalytic detoxification activity of Au/Bi 2 WO 6 -MoS 2 was nearly 4.84, 3.47 and 1.90 times higher than that of pristine Bi 2 WO 6 , Au/Bi 2 WO 6 and Bi 2 WO 6 -MoS 2 composites, which could be ascribed to the effective charge kinetics steering and well manipulation of charge flow by virtue of the rational structural and compositional features. This work provides a new perspective for the construction of high-activity detoxification photocatalysts through steering charge kinetics.
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