MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 8
·1-10
·
IF 6.232
Zou Lina,Yang Lingxi,Zhan Yi,Huang Di,Ye Baoxian
A photoelectrochemical platform for thrombin determination was developed based on Au-rGO-CuS as multiple signal amplification elements. CuInS 2 QDs was used to sensitize burr-shape TiO 2 (b-TiO 2 ) to obtain a strong photocurrent. Under the specific recognition between aptamer and thrombin, a sandwichlike structure was formed and the Au-rGO-CuS-labeled aptamer (S2@Au-rGO-CuS) was immobilized on the electrode surface. This induced a sharp decrease in photocurrent. The phenomenon is mainly due to the fact that CuS NPs can competitively consume the light energy and electron donor with CuInS 2 /b-TiO 2 . The rGO can increase the amount of CuS NPs and the Au NPs can accelerate charge transferring which depress the recombination of photogenerated electrons and holes in CuS to further enhance the competitive capacity of CuS. The sandwichlike structure has a steric hindrance effect. Therefore, the S2@Au-rGO-CuS has a multiple signal amplification function for thrombin determination. Under optimal conditions, the PEC aptasensor exhibited a wide linear concentration range from 0.1 pM to 10 nM with a low detection limit of 30 fM (S/ N = 3) for thrombin. Besides, the designed aptasensor performed well in the assay of human serum sample, indicating good potential for the determination of thrombin in real samples.
Graphical abstract
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Molecular Catalysis
·
2020
·
IF 3.687
Jiajun Dai,Yunlong Guo,Luhang Xu,Guilin Zhuang,Yi Zheng,Daohua Sun,Jiale Huang,Qingbiao Li
Bovine serum albumin (BSA)-templated CeO 2 was prepared by citrate sol-gel method and used as a support to synthesize Au catalyst for benzene oxidation. It was found that the Au/BSA-CeO 2 with 3.2 nm Au nanoparticles (NPs) gave rise to superior catalytic performance for benzene oxidation in which the temperature for 90 % benzene conversion was only 210 °C. In addition, the catalytic activity of Au/BSA-CeO 2 remained stable for 140 h of on-stream reaction. Besides, density functional theory calculation demonstrated how the porous structure of CeO 2 influenced the oxygen vacancy generation, and the synergetic effects of Au NPs and CeO 2 support facilitated the activation of benzene which was adsorbed on Au NPs prior to benzene oxidation. The catalysis of benzene oxidation over Au/CeO 2 catalyst follows the dual-site mechanism. BAS-templated CeO 2 support possessed hierarchical structure, abundant adsorbed oxygen species and synergic interaction with Au that determined the performance of Au/BSA-CeO 2 .
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Dong Li,Jie Lao,Chunli Jiang,Chunhua Luo,Ruijuan Qi,Hechun Lin,Rong Huang,Geoffrey I.N. Waterhouse,Hui Peng
Hydrogen production from water splitting through electrocatalytic or photoelectrochemical route shows great potential for renewable energy conversion. Herein, the plasmon-enhanced photoelectrical nanocatalysts (NCs) have been successfully developed by Au nanoparticle-decorated Bi 2 Se 3 nanoflowers (Au@Bi 2 Se 3 NFs) as catalysts for hydrogen evolution reaction (HER), leading to a more than 3-fold increase of current under excitation of Au localized surface plasmon resonance (LSPR) and affording a markedly decreased overpotential of 375 mV at a current density of 10 mA cm −2 . The HER enhancement can be largely attributed to effective electron-charge separation and the increase of carrier density in Bi 2 Se 3 induced by the injection of hot electrons of Au nanoparticles. Meanwhile, Bi 2 Se 3 nanoflowers (NFs), a kind of topological insulators, possess gapless edges on boundary and show metallic character on surface, providing a path for the flow of electrons in the electrocatalytic system . This study opens up a new avenue towards the design of higher energy conversion catalytic water splitting systems with the assistance of light energy , which could increase of HER catalysis efficiency by plasmonic excitation.
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MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 12
·1-9
·
IF 6.408
Yuan Xiang,Zhang Huiling,Cao Huijuan,Mao Guojiang,Wei Lin
A visible and sensitive assay for the quantitative detection of β-glucosidase (β-glu) activity based on Au@CeO 2 core-shell nanoparticles (Au@CeO 2 NPs) is described. As a hydrolytic enzyme, β-glu can promote the hydrolysis of β-arbutin to hydroquinone (HQ), which can trigger the decomposition of the CeO 2 shell. With the single-particle enumeration (SPE) strategy coupled with dark field optical microscopy (DFM), an obvious color alteration of single Au@CeO 2 NPs during the etching process can be observed in real-time. By statistically calculating the number of the etched nanoparticles, the β-glu activity level can be quantified accurately. This assay displays a broad linear range from 0.5 to 50 mU⋅mL −1 and low detection limit of 0.12 mU⋅mL −1 . In addition, this method was successfully used to determine β-glu in real samples and acquires satisfactory recoveries in the range of 97.1-102.0%. This study provides a visualization analysis method for β-glu, which may be helpful for monitoring other targets in the future. Graphical Abstract
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Ziqiang Wang,Yile Wang,Hugang Zhang,Hongjie Yu,Kai Deng,You Xu,Hongjing Wang,Liang Wang
The hybrid water electrolysis, consisting of the hydrogen evolution reaction (HER) and hydrazine oxidation reaction (HzOR), is an attractive route for energy-efficient hydrogen production, and the efficiency depends on the construction of highly active bifunctional catalysts. Here, one-dimensional heterointerfacial Au–Rh2P mesoporous nanotubes (Au–Rh2P MNTs) are synthesized using poly(ethylene oxide)-b-poly(methyl methacrylate) and Ni nanowires as the dual template and NaH2PO2 as the phosphorus dopant. Thanks to highly active sites and a strong electronic effect, Au–Rh2P MNTs exhibit excellent electrocatalytic performance for alkaline HzOR and HER, requiring only 16 and 26 mV at a current density of 10 mA cm–2, respectively. For hydrazine oxidation-assisted water electrolysis, Au–Rh2P MNTs require a low potential of 59 mV to produce hydrogen at 10 mA cm–2, highlighting low-energy hydrogen production by the replacement of oxygen evolution reaction by HzOR.
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MOLECULES
·
2023
·Vol. 28
·期 18
·6619
·
IF 4.6
Guozheng Zhao
Based on an indirect competitive method, a novel nano-Au/fluticasone propionate electrochemical immunosensor was successfully fabricated by combining the nanoscale effect, superior conductivity of nano-Au, stable Au−S chemical bond as well as strong interaction between glucocorticoid and the receptor, which was used to simultaneously detect eight kinds of glucocorticoids. The modified immunosensors’ electrochemical properties were explored by means of a cyclic voltammetry (CV) method and electrochemical impedance spectroscopy (EIS) measurements. Two factors (glucocorticoid receptor concentration, incubation time) were studied in order to obtain the optimal results. The immunosensor presents attractive electrochemical performance with a wide linear range (between 0.1 and 1500 ng⋅mL−1) and low detection limit (between 0.057 and 0.357 ng⋅mL−1), realizing the rapid multi-residue detection of a large class of glucocorticoids. Two glucocorticoids (hydrocortisone, triamcinolone) were detected in actual skincare samples, which obtained satisfactory detection results.
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Processes
·
2023
·Vol. 12
·期 1
·64
·
IF 3.5
Zehui Zhao,Guangmin Ren,Xiangchao Meng,Zizhen Li
In order to achieve efficient photocatalytic N2reduction activity for ammonia synthesis, a photochemical strategy was used in this work. UiO-66 was prepared through the solvothermal method and further loaded with Au nanoparticles (Au NPs) onto the UiO-66 (Zr) framework. The experimental results verified that there were metal–support interactions between Au NPs and UiO-66; this could facilitate charge transfer among Au NPs and UiO-66, which was beneficial to enhance the photocatalytic activity. The best N2fixation effect of Au/UiO-66 with a loading of 1.5 wt% was tested, with a photocatalytic yield of ammonia of 66.28 μmol g−1h−1while maintaining good stability. The present work provides a novel approach to enhancing photocatalytic N2fixation activity by loading NPs onto UiO-66.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Dan Han,Yi Chen,Donghui Li,Jiexu Shi,Hongtao Wang,Xiuli He,Li Zhao,Weidong Wang,Shengbo Sang,Jianlong Ji
Surface modification with noble metal is considered as an effective strategy to enhance sensing performance of semiconductor gas sensors. In this work, gold nanoparticles (Au NPs) decorated Gallium Nitride nanoflowers (Au-GaN NFs) have been synthesized successfully by a feasible hydrothermal method combined with high temperature nitridation and followed by in-situ reduction process. The characterizations of the structure and morphology of as-obtained Au-GaN NFs indicated that the Au NPs were successfully loaded on the surface of GaN. The excellent gas sensing performance was observed for GaN of 2 mol% Au loaded, including the high response (86.8 %) to 100 ppm NH 3 with fast response/recovery time (41 s/169 s) at room temperature , low theoretical limit of detection (72 ppb), good stability and selectivity. Besides, the influence of humidity on the performance of sensors was explored, where the response can be reached 56.5 % towards 100 ppm NH 3 under 70 % RH. The improvement of the sensing performance of Au-GaN NFs sensor can be attributed to the combined action of chemical and electronic sensitization of Au NPs. This work provides a candidate of Au-GaN NFs for the development of wireless sensing system in NH 3 monitoring.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
·
IF 8.2
Xiaobo Xu,Yeyan Chao,Xiaozhen Ma,Hua Zhang,Jing Chen,Jin Zhu,Jing Chen
The construction of an effective antibacterial micro-environment to prevent infection and biofilm formation is critically important for the design of wound dressings. Herein, a novel hydrogel wound dressing was fabricated by embedding Au nanoparticles-decorated halloysite nanotubes (Au@HNTs) into the lignin-based hydrogel matrix containing polyvinyl alcohol and chitosan. The resulting composite hydrogel, noted as LPC-Au@HNTs, exhibited an excellent photothermal antibacterial activity owing to the embedded Au@HNTs in which Au nanoparticles were generously filled into the lumen of Halloysite nanotubes. The typical sample containing 4 wt% of Au@HNTs in the composite hydrogel (LPC-Au@HNTs4) had good mechanical and photothermal properties. The surface temperature of as-prepared hydrogel increased to 57.59 °C after 5 min upon NIR light irradiation (808 nm) at 1.0 W/cm 2 . The photothermal effect endowed the hydrogel dressing with excellent antibacterial activity, with significantly enhanced inhibition rates of Escherichia coli (99.00 %) and Staphylococcus aureus (98.88 %). Experiments in a mouse full-thickness skin defect wound model also showed that the hydrogel dressing had a facilitative effect on the repair of traumatic surfaces. This study provides a broadly appliable wound dressing for treating bacteria-infected wounds, greatly contributing to the design of photothermal antibacterial biomedical materials for wound healing.
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Frontiers in Bioengineering and Biotechnology
·
2023
·
IF 5.7
An-qi Yang,Wentong Zheng,Xiaoyang Chen,Jiayin Wang,Shuang Zhou,Hongzhi Gao
In this paper, we demonstrate a surface-enhanced Raman spectroscopy (SERS) biosensor based on the self-assembly of gold nanorods (AuNRs) for the specific detection of airway inflammatory factors in diluted sputum. The AuNR surface was modified with an antibody that was able to specifically recognize an airway inflammatory factor, interleukin-5 (IL-5), so that a end-to-end self-assembly system could be obtained, resulting in an order of magnitude amplification of the Raman signal and greatly improved sensitivity. Meanwhile, the outer layer of the biosensor was coated with silicon dioxide, which improved the stability of the system and facilitated its future applications. When the detected concentration was in the range of 0.1–50 pg/mL, the SERS signal generated by the sensor showed a good linear relationship with the IL-5 concentration. Moreover, it had satisfactory performance in diluted sputum and clinical subjects with asthma, which could achieve sensitive detection of the airway inflammatory factor IL-5. Overall, the developed biosensor based on the SERS effect exhibited the advantages of rapid and sensitive detecting performance, which is suitable for monitoring airway inflammatory factors in sputum.
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ACS ES&T Water
·
2023
·
IF 5.3
Lijuan Wang,Jiawei Li,Gansheng Zhong,Jiangpeng Li,Xiao Lu,Siqing Wang,Yuanyuan Tang
To face the current critical challenges of gold recovery and beneficial utilization of solid waste, this study synthesized diatom biochar from the anoxic pyrolysis of diatoms and proved the superiority of the diatom biochar as a novel adsorbent for Au(III) in both synthetic and real electroplating wastewaters. The diatom biochar was found to have a high adsorption capacity of 443.0 mg/g and a superior recovery efficiency of up to 92.1%. The Au(III) adsorption kinetics followed the pseudo-second-order and intraparticle diffusion models. Electrostatic attraction and reduction were detected as the major adsorption mechanisms. An exceptional selectivity was also observed for the diatom biochar toward Au(III) with other coexisting heavy metals. Even in the presence of CN– in the solution, the diatom biochar still exhibited superiority in Au(III) adsorption. Owing to its high affinity to Au(III), the diatom biochar was successfully applied in real electroplating wastewater containing trace Au(III), with an adsorption efficiency as high as 96.7%. These findings sufficiently demonstrate the excellent performance and economic feasibility of diatoms for Au(III) recovery from electroplating wastewater, which also promoted solid waste minimization of diatom biorefineries.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 23
·11222-11231
·
IF 3.3
Ying Li,Yujie Chen,Kaiyuan Wang,Yufeng Zhou,Wei Wei,Yuanjian Zhang,Songqin Liu
Nowadays, great progress has been achieved in improving the activity of nanozymes, nevertheless there are still huge challenges to skillfully modulate the catalytic functions of nanozymes. Herein, a nanozyme (CZIF/Au) is synthesized by chemically depositing Au nanoparticles (NPs) on a pyrolyzed zeolitic imidazolate framework-8 (CZIF). Surprisingly, the CZIF/Au presents enhanced peroxidase-like activity when irradiated with a 655 nm laser and improved catalase-like properties under 808 nm laser irradiation. The catalytic mechanisms of the CZIF/Au were investigated. Energy levels reveal that the 655 nm laser triggers the collective oscillation of the electrons in the 6sp band of Au NPs, called the intraband transition, whereas the 808 nm laser excites the valence electrons in the 5d band of the Au NPs into the 6sp band, named the interband transition, associated with a photothermal effect. The different electron transitions result in the two different photocatalytic functions. CZIF/Au with peroxidase-like performance to detect hydrogen peroxide (H2O2) exhibits an excellent detection limit (0.35 μM) and a wide detection range (2.5–500 μM). The molecular-level insights into the photocatalytic reactions provide a strategy to regulate the properties of nanozymes and prospects for the multi-faceted use of nanozymes in the future.
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