ACS Nano
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2017
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IF 13.942
Yu Zou,Chao Sun,Wenbin Gong,Xianfeng Yang,Xin Huang,Ting Yang,Weibang Lu,Jiang Jiang
Integrating a plasmonic metal and a semiconductor at the nanoscale is of great importance for exploring their optical coupling properties. However, the synthesis and fine structural control of such nanostructures remain challenging. Herein we report the facile aqueous-phase Se-mediated overgrowth of metal selenides onto Au nanocrystals. Taking plasmonic Cu2–xSe as an example, the introduction of a Se template allows deposition of large Cu2–xSe crystalline grains onto Au nanocrystal seeds in various shapes, including spheres, rods, and plates. Moreover, the configuration of Au–Cu2–xSe hybrids can be tuned from core–shell to heterodimer structure by controlling the growth behavior of the Se template. Se overgrowth depends critically on the absorption strength of stabilizers on Au seeds: a strongly absorbing stabilizer inhibits isotropic overgrowth, which is in agreement with molecular dynamics simulations. The resultant Au–Cu2–xSe hybrid nanocrystals possess multiple surface plasmon resonance modes. Finally, our synthetic strategy can be extended to prepare other Au–metal selenide hybrids such as Au–Ag2Se and Au–CdSe with controllable morphologies.
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ELECTROCHIMICA ACTA
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2017
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IF 4.798
Xuan Xu,Qiqin Zheng,Guangmin Bai,Lishu Song,Yuewei Yao,Xiaodong Cao,Songqin Liu,Cheng Yao
Bisphenol A (BPA) is one of the most prevalent environmental endocrine disrupting chemicals with potential estrogenic activity. Herein we report a facile electrochemical sensing strategy for ultrasensitive detection of BPA based on the hybrid of AuNPs decorated reduced graphene oxide (RGO). This Au@PDA-RGO hybrid was synthesized by in-situ growth of AuNPs induced by polydopamine (PDA) on RGO. Since PDA acts as a moderate reducing agent and an effective linker, AuNPs scatter well on RGO with controllable density, homogeneous size and uniform distribution. With the aid of chitosan (Chit), an electrochemical tyrosinase (Tyr) biosensor based on Au@PDA-RGO was constructed on glassy carbon electrode (Tyr/Au@PDA-RGO-Chit/GCE). This immobilization matrix possesses high conductivity, large active areas and a suitable biological microenvironment. As a result, the constructed Tyr biosensor exhibited good analytical performance for BPA with a high sensitivity of 0.2569 A M −1 , a wide linear range from 12.5 nM to 3.68 μM, and a low detection limit of 0.10 nM (S/N = 3). This method was also applied to detect BPA in plastic products, showing good agreement with the values detected by HPLC-MS/MS.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2017
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IF 4.421
Bowen Li,Yidi Wang,Fangyuan Tian,Guanshu Li,Zhaohong Zhang,Jun Wang,Youtao Song
In order to expand the light response range of wide band-gap semiconductor photocatalyst (NaTaO 3 ) for effective photocatalytic conversion of Cr(VI), an up-conversion luminescence agent (Er 3+ :YAlO 3 ) is combined with NaTaO 3 and a visible-light driven photocatalyst, NaTaO 3 /Er 3+ :YAlO 3 , is prepared. Moreover, several conduction band co-catalysts (Ag, Au and Pt) are deposited the surface of NaTaO 3 /Er 3+ :YAlO 3 , respectively, to facilitate the transfer rate of photo-generated electrons. X-ray diffractometer (XRD), energy dispersive X-ray spectroscopy (EDX) and scanning electron microscopy (SEM) analyses are employed to confirm the morphology, microstructure and composition of the prepared photocatalysts. In addition, UV–vis diffuse reflectance spectra are determined to explore the visible-light absorption properties of Er 3+ :YAlO 3 , NaTaO 3 , NaTaO 3 /Er 3+ :YAlO 3 and X/NaTaO 3 /Er 3+ :YAlO 3 (X = Ag, Au and Pt). Photoluminescence (PL) spectra are used to estimate the recombination rate of electron–hole pairs. The effects of irradiation time, photosource kind, solution acidity and used times on the photocatalytic capabilities of NaTaO 3 /Er 3+ :YAlO 3 and X/NaTaO 3 /Er 3+ :YAlO 3 (X = Ag, Au and Pt) are investigated in detail. The results show that the uses of up-conversion luminescence agent (Er 3+ :YAlO 3 ) and co-catalysts (Ag, Au and Pt) can promote NaTaO 3 to utilize visible-light to carry out the photocatalytic conversion of Cr(VI). Particularly, the prepared Au/NaTaO 3 /Er 3+ :YAlO 3 nanocomposite with 1.0 wt% Au and 0.3:1.0 molar ratio of Er 3+ :YAlO 3 and NaTaO 3 shows the highest photocatalytic activity in conversion of Cr(VI).
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BIOSENSORS & BIOELECTRONICS
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2016
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IF 7.476
Hanbing Rao,Min Chen,Hongwei Ge,Zhiwei Lu,Xin Liu,Ping Zou,Xianxiang Wang,Hua He,Xianyin Zeng,Yanying Wang
A novel molecularly imprinted electrochemical sensor for the rapid detection of melamine was reported in this paper. Glassy carbon electrode (GCE) was modified by Au and polyaniline composites (Au@PANI) deposited on the surface of GCE and were used to increase the electrode sensitivity and to amplify the sensor signal. Melamine template molecule was further assembled onto Au@PANI by the formation of hydrogen bonds , can implement the selective detection of melamine . This simple but efficient electrochemistry analysis platform presents a low detection limit of 1.39×10 −6 µmol L −1 for detection of melamine, which is remarkably lower than the currently used methods and the previous reports. So, this method may open a new way for the determination of melamine which enables low cost, effective and sensitive determination. This shows the sensor can be potentially utilized for the detection of melamine in food, which allows the sensitive and selective determination of melamine from milk and feed.
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BIOSENSORS & BIOELECTRONICS
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2017
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IF 7.78
Yicheng Wei,Xiaojian Li,Xu Sun,Hongmin Ma,Yong Zhang,Qin Wei
Combining dual-signal channels of differential pulse voltammetry (DPV) and amperometric i–t curve, we developed an amplified sandwich-type electrochemical immunosensor for ultrasensitive detection of prostate specific antigen (PSA). Due to the large specific surface area and good adsorption property, 3-aminopropyltriethox functionalized CeO 2 mesoporous nanoparticles (NH 2 -M-CeO 2 ) was used for supporting toluidine blue (TB) as the electron transfer mediator and anti-PSA as the signal response. To prevent the leak of TB and facilitate the electron transfer property of NH 2 -M-CeO 2 , ionic liquids doped carboxymethyl chitosan (CMC/ILs) were incorporated and TB/M-CeO 2 /CMC/ILs complex was gotten to act as the label of anti-PSA (Ab 2 ). Meanwhile, Au-CoS/graphene was as the matrix materials modifying the electrode to immobilize anti-PSA (Ab 1 ). Specifically, Au-CoS/graphene cannot produce electrochemical signals through DPV method but can provide an obviously electrochemical signal towards catalysis hydrogen peroxide (H 2 O 2 ) through amperometric i–t curve method. At the time of detection, with the increase of concentrations of PSA, the DPV signals from TB/M-CeO 2 /CMC/ILs were increased and the amperometric i–t curve signals from the Au-CoS/graphene were decreased. Under the optimum conditions, the immunosensor demonstrated remarkable analytical performance of a linear range of 0.5 pg/mL to 50 ng/mL with a detection limit of 0.16 pg/mL for quantitative detection of PSA (S/N=3).
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Tian Tian,Xuefeng Hu,Yao Huang,Huixian Du,Chao Wang,Mina Yang
The widespread utilization of fossil fuels has resulted in a significant increase in CO 2 emissions, leading to a variety of environmental issues. The photocatalytic conversion of CO 2 into fuel presents an effective solution to both the energy crisis and environmental warming. Therefore, the selection of a suitable catalyst is paramount. However, traditional photocatalysts often encounter challenges such as rapid electron-hole recombination and limited exposure of active sites. To improve these limitations, this study introduces AFM-X, a heterojunction catalyst composed of Au/Fe 3 O 4 /MIL-101(Fe)-X, which facilitates the formation of open metal sites (OMS) that enhance the effective separation of photogenerated carriers. In AFM-X, OMS function as Lewis acid sites, thereby enhancing CO 2 adsorption. The presence of Au nanoparticles (NPs) introduces additional active sites for CO 2 reduction. The synergistic effect between OMS and Au NPs increases the catalyst’s active sites, while the heterojunction construction promotes electron transfer, thereby enhancing CO 2 photocatalytic reduction efficiency. The CO generation rate of AFM-2 reached 98.8 μmol g −1 h −1 , surpassing those of FM, MIL-101(Fe), Fe 3 O 4 , and Au NPs, by 4.1, 6.3, 6.2, and 3.2 times, respectively. Furthermore, AFM-2 maintains stable performance over a 40 h cycle test. In-situ DRIFTS spectroscopy reveals that CO 2 reduction occurs through two parallel pathways. This study offers new insights into the design of composite photocatalytic materials, highlighting the effectiveness of OMS Lewis acid sites in significantly enhancing the photocatalytic reduction of CO 2 .
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TALANTA
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2024
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IF 5.6
Haoran Cheng,Yifan Wang,Yirui Zhao,Hongman Hou,Gongliang Zhang,Jingran Bi,Shuang Yan,Hongshun Hao
Salmonella enteritidis ( SE ) is a food-borne pathogens that can cause acute gastroenteritis. With the increasing social attention to food safety, the detection method of SE has attracted wide attention. In response to the demand for efficient detection methods of SE , this study constructed a novel dual-mode photoelectrochemical-electrochemical (PEC-EC) aptamer-based biosensor. The sensor was constructed using Bi 4 NbO 8 Cl/In 2 S 3 heterojunction as the electrode substrate material, the hybridization chain reaction (HCR) and dye sensitization were used as the signal amplification strategies. Bi 4 NbO 8 Cl/In 2 S 3 heterojunction could provide an excellent initial photocurrent response for the sensing platform, and the HCR was opened by the end of complementary DNA (cDNA) and generated an ultra-long DNA double-stranded (dsDNA) “super structure” on the surface of the electrode, which could be embedded with a large number of methylene blue (MB) as the bifunctional probes. Thus, dual-mode output was achieved via the PEC and EC activity of MB. Under the optimized conditions, the PEC and EC signal responses of the system were linear to the logarithm of SE concentration in a range from 1.5 × 10 2 CFU/mL to 1.5 × 10 7 CFU/mL. The detection limits were found to be 12.9 CFU/mL and 12.3 CFU/mL using the PEC and EC methods, respectively. The constructed dual-mode biosensor exhibited good performance for real sample analysis, and demonstrated great application potential in the field of SE rapid detection. Moreover, this dual-mode detection strategy provided more accurate and reliable results than the single-mode output.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Fenglei Liu,Baowei Hu
Recovery of precious metal ions in wastewater could not only improve resource utilization, but also could reduce environmental pollution. Herein, a composite of TpPa@Nb 2 C was constructed by an interfacial self-assembled method and explored the synergistic adsorption effects for precious metals. The structure and morphology of the composites were analyzed by advanced characterization techniques, followed by parametric analysis of Au(III)/Pd(II) adsorption from the simulated wastewater. The results showed that the grafting of COFs with abundant reducing active sites on the MXenes could significantly improve the selectivity and adsorption capacity. Meanwhile, the interaction was found as monolayer way and controlled by chemistry process, and the maximum equilibrium Au(III) and Pd(II) uptake reached up to 910.1 and 386.2 mg/g, respectively. The competitive adsorption study showed that the co-existence of impurities had little effect on the removal rate. The mechanism analysis demonstrated that the precious metal ions were reduced to elemental gold/palladium on the network of TpPa@Nb 2 C, and they got three electrons or two electrons from the hydroxyl groups through redox reaction, respectively. Thus, this study provided an excellent material for enrichment and recovery of precious metals in waste liquid and the treatment of e-waste.
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ACS Sensors
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2024
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IF 8.2
Yahui He,Jian Zhou,Jinbo Zhang,Yihao Guo,Zhangbin Ji,Hui Chen,Yongqing Fu
Love-mode surface acoustic wave (SAW) sensors show great promise for biodetection applications owing to their low cost, digital output, and wireless passive capability, but their performance is often restricted by the availability of suitable sensitive membrane layers. Herein, a composite layer of electrospun fibers made from cellulose acetate and polyethylenimine, coated with gold nanoparticles, is proposed as a porous and sensitive membrane coated onto a love-mode SAW biosensor for monitoring gene sequences of Staphylococcus aureus. The results showed that the developed sensor exhibited an impressive sensitivity of 122.56 Hz/(nmol/L) for detecting gene sequences of S. aureus, surpassing the sensitivity of conventional SAW sensors employing a bare Au film as the sensitive layer by 5-fold. The analysis revealed a remarkably linear detection (R2 of 0.97827) of S. aureus gene sequences within the range of 0 to 100 nmol/L. The limit of detection was impressively low at 0.9116 nmol/L. The good stability and specificity of the biosensor in liquid environments were demonstrated for clinical diagnostics.
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SENSORS AND ACTUATORS B-CHEMICAL
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2017
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IF 5.401
Yilin Lu,Jie Zhong,Guohua Yao,Qing Huang
A prototype of label-free SERS sensor, based on the formation of T-Hg 2+ -T pairs and the corresponding orientation variation of DNA on Au shell surface, was developed for detection of Hg 2+ in aqueous solution quantitatively and selectively. The DNA aptamer immobilized on the surface of SiO 2 @Au core/shell nanoparticles (NPs) consisted of two segments, namely, the segment which has the consecutive thymines (T) severing as the Hg 2+ recognition elements, and the segment which contains the guanine (G) and adenine (A) bases working as the signal reporter. With interaction of Hg 2+ ions and the thymines between the adjacent single-stranded DNA (ssDNA), the DNA molecule adopted vertical orientation, resulting in increase of Raman intensity ratio I(660 cm −1 )/I(736 cm −1 ) with increase of Hg 2+ concentration, which thus allowed to measure trace amounts of Hg 2+ in aqueous solution selectively and quantitatively. Our results revealed that this label-free SERS sensor could sensitively respond to Hg 2+ ions within a wide concentration range (from 1 × 10 −8 to 1 × 10 −3 M). This work therefore demonstrates that proper design of aptamer-modified SiO 2 @Au core/shell NPs can be utilized for label-free SERS detection of heavy metal ions in the environment.
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SENSORS AND ACTUATORS B-CHEMICAL
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2018
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IF 5.667
Haiyan Jia,Jingkun Xu,Limin Lu,Yongfang Yu,Yinxiu Zuo,Qingyun Tian,Ping Li
Conductive poly(3,4-ethylenedioxythiophene) (PEDOT) composites have emerged as potential candidates for electrochemical biosensors, however, the sensing performance was mainly relied on their structure and composition. In this work, a novel three-dimensional (3D) structural nano-PEDOT-graphene aerogel (nano-PEDOT-GA) composite was designed via the in-situ polymerization of nano-PEDOT on porous 3D GA. SEM revealed that the introduction of GA could induce the growth of worm-like PEDOT. Subsequently, Au nanoparticles (AuNPs) were directed to nano-PEDOT-GA surface by electrodeposition method. Featuring the excellent biocompatibility, high specific surface area and good conductivity of AuNPs/nano-PEDOT-GA, a highly sensitive label-free immunosensor was developed using AuNPs/nano-PEDOT-GA as signal amplification platform for detecting prostate specific antigen (PSA). Under the optimal conditions, the fabricated immunosensor presented a good linear in the analytical range of 0.0001–50 ng mL −1 with a low detection limit of 0.03 pg mL −1 (S/N = 3), high selectivity against other serum interfering substance and good stability and reproducibility, which provides a promising platform for the clinical immunoassay of PSA.
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BIOSENSORS & BIOELECTRONICS
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2017
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IF 7.78
Zhuoyue Zhang,Zhen Zhang,Huihui Liu,Xiang Mao,Wei Liu,Shouting Zhang,Zongxiu Nie,Xiaoquan Lu
Visual inspection is expected as an ideal technique, which can directly and conveniently detect heavy metal ions by observing the color change. Insensitivity of detecting weakly colored heavy transition metal ions and low adsorptivity of metal ions on nanoparticle surface are two main factors hindering the application of visual detection in heavy metal ions detection. Herein, we demonstrated an operational colorimetric sensor based on the color dependence of nanoparticles aggregation to selective and facile detect weakly colored transition heavy metal Cd 2+ ions that have been considered as the origin of the “Itai-itai” disease. Uniform colloidal 15 nm graphite-like nitride doped carbon quantum dots-capped gold nanoparticle (Au@g-CNQDs) was successfully prepared, wherein the existence of numerous heptazine, carboxyl and hydroxyl groups on the nanoparticle's surface strengthened adsorption of the Cd 2+ ions on the surface of Au@g-CNQDs through the “cooperative effect”. As a consequence, without expensive and intricate exogenous indicators or other special additives, the Cd 2+ ions could sensitively and quickly captured to detect at ultra-low concentration within 30 s by the naked-eye. Under the optimal conditions, the Cd 2+ ions sensor possesses good analytical performances with a wide linear range of 0.01–3.0 μM and a detection limit of 10 nM (S/N = 3). Moreover, the biodistribution and aggregation of Cd 2+ ions were detected effectively in mice organ tissues suggesting its great potential use for real-word applications.
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