JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Qianzhu Mu,Yanfeng Sun,Aiying Guo,Xiaoyue Xu,Baoping Qin,Aijun Cai
A NiCo 2 O 4 -Au composite was fabricated following the calcination-reduction method and testified to exhibit the intrinsic high peroxidase- and oxidase-like activities. The composite could activate a low level of H 2 O 2 (100 μM) to kill E. coli and S. aureus . NiCo 2 O 4 -Au composite could be easily separated by an external magnet from the media and reused several times. NiCo 2 O 4 -Au composite could also effectively damage the existing biofilms and prevent the formation of new biofilms. The electron spin resonance tests showed that NiCo 2 O 4 -Au composite catalyzed H 2 O 2 into reactive oxygen species (ROS), mainly including OH, O 2 − , and 1 O 2 ; while the oxidase-like activity of NiCo 2 O 4 -Au also stemmed from the ROS formation in the absence of H 2 O 2 . The radical trapping experiment confirmed that O H and 1 O 2 were the main radicals in the antibacterial process for NiCo 2 O 4 -Au in the presence of H 2 O 2 . A NiCo 2 O 4 -Au based Band-Aid was also designed, which exhibited high anti-infective and wound-healing properties. This study has demonstrated that NiCo 2 O 4 -Au composite can be a promising antibacterial agent in environmental and clinical applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2020
·
IF 5.339
Kaiqiang Wang,Da-Wen Sun,Hongbin Pu,Qingyi Wei
The development of flexible and robust plasmonic substrates has become a hot research topic in simplifying and extending the application of surface-enhanced Raman scattering (SERS) technique for real-world analysis. In this work, a facile method to fabricate an Au@Ag nanoparticle array sandwiched between the adhesive acrylic polymer tape and polyethene terephthalate (PET) film (T/Au@Ag/PET) as a high-performance SERS chip was reported for nondestructive detection of thiram on fruit peels. For this SERS chip, the ordered Au@Ag nanoparticle array formed by the self-assembly method was closely-packed, which generated high‐density sub‐3‐nm gaps and could produce high reproducible and sensitive SERS enhancement effects. The measurement of crystal violet with the limit of detection of 7.24 × 10 −10 M was realized by targeting Raman shift at 1177 cm −1 . Moreover, the excellent flexible feature of acrylic polymer tape enabled the substrate to withstand a tensile strain value of 20% for three cycles without significantly losing its SERS activity. By covering with a PET film, the SERS chip could maintain 87% SERS activity after storage for 60 days in the air environment, and could well withstand the influence of harsh conditions such as high temperature and ultrasound treatments. As a proof of the concept, the SERS tape was directly used to detect thiram on apple, tomato, and cucumber peels via a simple sampling-and-detection procedure, and the detection limit of 5 ng/cm 2 was achieved. The T/Au@Ag/PET SERS chip should hold a promising candidate for food safety analysis in the future.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NANO
·
2020
·
IF 1.566
Bin Chen,Jialu Zhang,Yan Zhang,Lijing Zhu,Haichao Zhao
Herein, carbon quantum dots (CQDs) and gold nanoparticles (Au NPs) were synthesized and deposited on the surface of Polysulfone (PSF) membrane using polydopamine as the sublayer, resulting in excellent antibacterial property and photocatalytic activity for degradation of organic dyes. Water contact angle (WCA) of the membrane before and after surface modification dropped from 9 3 . 9 ∘ to 5 8 . 4 ∘ , due to outstanding hydrophilicity of CQDs. The antibacterial test against E . c o l i found that the CQDs/Au NPs were beneficial to improve the antibacterial property of the membrane, and the antibacterial rate could reach 90%, effectively prolonging the service life of the membrane. In addition, the adsorption of bovine serum albumin (BSA) molecules on the membrane was significantly reduced, and the irreversible fouling ratio also decreased from 41.3% to 10.7%. On the other hand, the CQDs/Au NPs layer was used as a photocatalytic material for degradation of methylene blue.
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 10
·1-9
·
IF 6.232
Luo Guiling,Deng Ying,Zhu Lin,Liu Juan,Zhang Bingxue,Zhang Yan,Sun Wei,Li Guangjiu
A core-shell ZIF-8@ZIF-67 was synthesized and pyrolyzed to get a Co nanoparticles-embedded N-doped carbon nanotube hollow polyhedron (Co@NCNHP). Then Au nanoparticles were formed on the surface and core of Co@NCNHP to obtain an Au-Co bimetal decorated NCNHP (Au-Co@NCNHP). The resultant nanocomposite was characterized by various methods including transmission electron microscopy, scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. The Au-Co@NCNHP-based electrochemical sensor displayed an obviously high electrocatalytic response to the oxidation of quercetin, which was attributed to the synergistic effects of Au-Co bimetal nanoparticles and N-doped carbon nanotube with hollow polyhedron. Under the optimal conditions, the oxidation peak currents exhibited a wide linear dynamic range for quercetin concentration from 0.050 to 35.00 μmol/L, and the detection limit was 0.023 ± 0.002 μmol/L (S/ N = 3). The analytical applications of the proposed electrochemical sensor were checked by determining the content of quercetin in medical and onion samples with satisfactory results.
Grapical abstract
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Biomaterials Science & Engineering
·
2020
·
IF 4.152
Le Gao,Zhitao Wu,Abdul-Rauf Ibrahim,Shu-Feng Zhou,Guowu Zhan
Hollow nanomaterials have been used as an attractive platform for the integration of multiple bioactive components for effective anticancer therapy. Herein, we report a novel and facile strategy for the fabrication of hollow and monodispersed zeolitic imidazolate framework-8 (ZIF-8) by the self-template method with folic acid (FA) as a bioetcher. Gold nanocluster and folic acid were critical for the formation of the hollow ZIF-8 (thickness of 38 nm) during solvothermal synthesis. By integrating CuS nanoparticles (size of 4.9 nm), the resultant quadruple ZIF-8/Au/CuS/FA nanocomposites (denoted as FACZ) exhibited effective anticancer activities on FA receptor-positive MCF-7 and HepG-2 tumor cells but a weak killing effect on HCMEC/D3 cells. Folic acid molecules were conjugated to the external surface of FACZ, which simultaneously offered an excellent tumor-targeting ability and fluorescence imaging property. Although the photothermal therapy caused by CuS was not so obvious due to partial reduction, the nanosized FACZ after cellular uptake was able to release Cu(I) to enable chemodynamic therapy. This catalytically decomposed H2O2 to produce highly reactive oxygen species via the Fenton-like reaction as determined by the extracellular and intracellular hydroxyl radical. Our work offers a simple route for the fabrication of hollow ZIF-8 nanocomposite with active and selective anticancer activity. This is envisaged to have great potentials in biomedical applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Xinyu He,Chuang Ge,Xiangquan Zheng,Bin Tang,Li Chen,Shunbo Li,Li Wang,Liqun Zhang,Yi Xu
The rapid detection of alpha-fetoprotein (AFP) in serum is of great significance in the early diagnosis of hepatocellular carcinoma (HCC). A novel six-channel microfluidic SERS chip integrated with Ag/Au nanocomposites (NCs) for rapid SERS identification of AFP in serum was proposed in this work. Automatic injection was realized by negative pressure formed by specially designed PDMS module on the SERS chip. The serum samples originating from 60 HCC patients and 60 healthy people were measured by SERS on the designed microchip under the optimized conditions. The SERS spectra of serum samples from normal people and patients were collected and analyzed by Principal Component Analysis (PCA) which separated the characteristic Raman peaks of AFP of the two groups into two distinct clusters. Linear Discriminate Analysis (LDA) based on the PCA generated features differentiated the patients’ sera SERS spectra from the normal sera SERS spectra with a classification accuracy of 96.25% and a blind sample test accuracy of 95%. It is shown that the proposed microfludic SERS chip for AFP SERS test in serum can rapidly and efficiently identify HCC patients. It is of great research value and practical prospect in the fields of disease diagnosis and screening.
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Lun Wang,Keming Wang,Ruihua Huang,Zhen Qin,Yingchun Su,Shanshan Tong
In the past few years, two-dimensional (2D) nanomaterials have emerged great potential for the removal of valuable metals and the capture of polluted-heavy metals. Herein, hierarchically flower-like microcrystals with 2D WS 2 nanosheets (F-WS 2 MCs) were prepared by one-pot hydrothermal synthesis strategy and its adsorption performances for precious metals were systematically assessed. The excellent adsorption efficiencies of ∼86.8%, ∼27.6%, and ∼94.1% towards Ag (I), Pd (II), and Au (III) respectively were achieved within 120 min, and the adsorption curves were in good agreement with a pseudo-second-order kinetic model showing a fast uptake rate at the optimum pH values (1.30 for Au (III), 1.43 for Ag (I), and 3.20 for Pd (II)). The adsorption isotherm followed well in the Langmuir model with the maximum removal capacities ( q max ) of 186.2 mg g −1 for Ag (I), 67.29 mg g −1 for Pd (II), and 1340.6 mg g −1 for Au (III), respectively. Furthermore, for recycling purposes, the relevant desorption solution was investigated with different ratios of monobasic acid and thiourea , suggesting the best desorption efficiency of 93.03%, 88.08%, and 85.34% for Ag (I), Pd (II), and Au (III), respectively. By characterizing the crystalline phase, and micromorphology element mapping of F-WS 2 MCs before and after adsorption, the strong affinity and significant adsorption–reduction were indicated to dominate the adsorption process. Therefore, this work broadens the application range of WS 2 microcrystals, providing an alternative material for capturing precious metals and wastewater treatment applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOMATERIALS
·
2020
·
IF 10.317
Zihan Mei,Duyang Gao,Dehong Hu,Huichao Zhou,Teng Ma,Liang Huang,Xin Liu,Rongqin Zheng,Hairong Zheng,Ping Zhao,Jianqiao Zhou,Zonghai Sheng
Multidrug-resistant Staphylococcus aureus (MRSA) seriously endanger human health. The development of efficient methods to eliminate the infections and monitor the treatment process are of great significance. Near-infrared-II (NIR-II) photoacoustic (PA) imaging and photothermal therapy (PTT) are highly integrated theranostic platforms with superior performance including a low imaging background, increased tissue penetration depth, and high photothermal threshold. Herein, we report an activatable near-infrared II (NIR-II) phototheranostic strategy using miniature Au/Ag nanorods (NRs) for the photochemical synergistic therapy of MRSA infections and in situ monitoring of the treatment progress. Au/Ag NRs were efficiently activated by ferricyanide solution and allowed to continuously release free Ag + to eliminate MRSA, triggering NIR-II photothermal and PA performance enhancement. The activated NIR-II photothermal effect in turn accelerated the release of free Ag + from Au/Ag NRs for the synergistic elimination of gram-positive Staphylococcus aureus and promoted wound healing. No photothermal damages or free Ag + -induced side effects were observed in treated mice. After synergistic treatment, a 20-fold NIR-II PA signal increase with a maximum signal-to-noise measurement of 9.5 was observed between the implanted site and normal tissue, enabling sensitive monitoring of Ag + release process. The prepared Au/Ag NRs were stable and biocompatible, showing great potential for activatable NIR-II phototheranostic application.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Jin Chen,Mingzhu Jiang,Jing Chen,Wenjian Xu,Hongpeng Jia
Selective immobilization of single-atom Au on the specific facets of CeO 2 has been successfully performed by redox etching precipitation (REP), which makes it possible to clearly refine the interfacial effect of multiple-facet support on single atom . With systemic characterizations, it is found that single-atom Au is apt to lie on nonpolar facets of CeO 2 (111) and (110) rather than polar facet of CeO 2 (100). The modification of morphology-dependent properties is attributed to the different interaction between Au atom and each CeO 2 interface. Because of synergy between Au and CeO 2 , more oxygen vacancies and more active oxygen species are generated; meanwhile, the interfacial effect stabilizes the charged Au species which serves as active site. Therefore, the performance in catalytic oxidation of HCHO and CO on CeO 2 is facilitated by loading Au. Among them, CeO 2 rod-supported Au as an optimal catalyst exhibits a remarkable activity and stability. With in-situ characterization, the reaction mechanisms for HCHO and CO oxidation over Au/r-CeO 2 are studied. Meanwhile, it is proved that REP strategy is also valid to obviously promote catalytic performance whenever commercial CeO 2 is used or Au is replaced with Ag, so the improvement of recently applied catalyst with REP process is promising.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Zhu Lu,Jun Dong,Qingyan Han,Wei Gao,Yongkai Wang,Jihong Liu,Zhongyu Wang,Zeyu Sun,Boyang Wang,Jianxia Qi
Here, we successfully synthesized silver-coated gold nanorods (Au@Ag NRs) via a facile wet chemical method . The catalytic property of Au@Ag NRs in water solution was much better than that of Au NRs in water solution. To obtain high catalytic properties, we self-assembled a single-layer Au@Ag NR array by evaporation on a silicon wafer . The catalytic activity of the Au@Ag NR array was probed using the reduction of 4-nitrothiophenol. The reaction processes were monitored and identified through in situ surface-enhanced Raman spectroscopy based on the confocal Raman microscope system. This study provides a simple and fast method to improve the catalytic property of the noble nanoparticles .
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Xiaojing Yu,Haoran Qiu,Bin Wang,Qingnan Meng,Shaodong Sun,Yufei Tang,Kang Zhao
To construct Z-scheme not only can effectively separate the excited electron-hole pairs, but also utilize the ample redox capability of each semiconductor component in this system for the surface photocatalytic reaction. In this work, a TiO 2 –Au–BiOBr ternary Z-scheme photocatalyst was constructed, in which Au NPs were used as the electron mediator to join BiOBr nanosheets and TiO 2 nanofibers . The results showed that, under full spectrum irradiation, TiO 2 –Au–BiOBr nanofibers exhibited outstanding photocatalytic performance toward the degradation of Rhodamine B (RhB) with an excellent photodegradation efficiency of 99.91% within 30 min as well as good stability. The reaction mechanism of the TiO 2 –Au–BiOBr Z-scheme system was systemically studied by XPS , photoelectrochemical tests and free radical trapping experiments, etc. Moreover, the photocatalyst also exhibited excellent photocatalytic activity for degrading methyl orange and methylene blue.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Yuting Hu,Shixing Wang,Libo Zhang
A novel Cu-based bisligand metal organic framework adsorbent (Cu-BMOF) was prepared by hydrothermal method using 5-methyl-2-thiophenecarboxylic acid and 4,4-azopyridine as organic linkers. The samples were analyzed by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and zeta potentiometry (Zeta). To investigate the adsorption performance of Cu-BMOF for Au(III), the effects of pH, temperature, adsorption time and initial concentration were explored. At 298 K and pH = 2, the maximum adsorption capacity of Cu-BMOF for Au(III) is 933 mg/g. Langmuir and quasi-second-order models can describe the adsorption process well. Au(III) adsorption on Cu-BMOF is a monolayer and irreversible chemisorption process. Thermodynamic studies show that the adsorption process of gold on Cu-BMOF is exothermic and spontaneous. The response surface method (RSM) was applied to optimize the adsorption efficiency. Under optimal conditions, the adsorption rate was 99.64%. X-ray photoelectron spectroscopy (XPS) results show that the adsorption mechanism of Cu-BMOF is the binding between Au (III) and the N, and S functional groups of Cu-BMOF. In addition, the affinity of Cu-BMOF for Au(III) is superior compared with that of coexisting ions in water. Cu-BMOF have promising applications in environmental protection and water purification .
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）