ACS Applied Nano Materials
·
2021
·
IF 5.097
Yuhui Miao,Kuo Yang,Shenfei Zong,Zhuyuan Wang,Yiping Cui
Applying nanomaterials to highly sensitive, fast, and accurate detection of hazardous chemicals in water remains to be a great challenge. Herein, a Ti3C2-functionalized superlattice SERS substrate was developed, which can identify multiplex fish drug residues in pond water with a high sensitivity and reliable reproducibility. Specifically, a superlattice substrate was fabricated by vertically self-assembled bimetallic nanocuboids (BNCs) through the Marangoni effect, which exhibited an excellent SERS activity. Furthermore, the modification of the Ti3C2 layer endows the substrate with both an increased SERS signal and an enhanced adsorption for multiple fish drugs, including crystal violet (CV), malachite green (MG), and methylene blue (MB). The limit of detection (LOD) was as low as 10–12 M, while the signal fluctuation was as small as ∼5.9% between batches. More importantly, a trace amount of multiplex fish drug residues was detected in natural pond water, demonstrating a convincing practicality of such a Ti3C2-functionalized superlattice SERS substrate.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Yan Liu,Shao-Hua Wu,Xing-Yuan Du,Jian-Jun Sun
Surface-enhanced Raman scattering (SERS) biosensing has attracted great attention due to its multiplexed capability, high sensitivity, and rapid readout. In this study, plasmonic Ag nanocube (AgNC) enhanced SERS biosensing platform was proposed by coupling nicking endonuclease-assisted target recycling signal amplification with heated electrode for sensitive detection of DNA species related to oral cancer. SERS tags were manufactured by signal DNA (sDNA) conjugating onto the surfaces of AgNCs, and 4-mercaptobenzoic acid (4-MBA) assembled on the surfaces of AgNC/sDNA as a Raman reporter. The sharp feature of edges and corners of AgNCs with high electromagnetic field provided SER hot spots with high quality, and stronger SERS signal could be achieved. In addition, the activity of nicking endonuclease Nt.BstNBI could be greatly enhanced by elevating the temperature of the surface of the heated Au electrode (HAuE) during Nt.BstNBI-assisted target recycling amplification process, resulting in dramatic amplification of target DNA detection. All of these contributed to the high sensitivity of the developed SERS biosensor. A limit of detection (LOD) of 3.1 fM (S/N = 3) could be obtained with an electrode temperature of 45 °C. This proposed SERS biosensor was anticipated to act as a promising biosensing platform for early clinical diagnosis of oral cancer.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Yi Xu,Md Mehedi Hassan,Afang Zhu,Huanhuan Li,Quansheng Chen
A new dual-mode optical-nano-sensor was designed to effectively isolate, discriminate and inactivate multiple foodborne pathogens through the combined effort of magnetic SERS tags and functionalized upconversion nanoparticles. The positively charged quaternary ammonium salt (QAS) functionalized upconversion nanoparticles (UCNPs@QAS) were used as a fluorescent probe for the analysis of total bacteria count and inactivation of bacteria, and 4-mercaptophenylboronic acid (4-MPBA) modified magnetic Au@Ag NPs (MAu@Ag@MPBA) were applied as a SERS tag for isolation and classification of bacteria. Various types of bacteria can be captured by UCNPs@QAS through electrostatic interactions and by MAu@Ag@MPBA via the reversible recognition interaction of a boronic acid group of 4-MPBA and peptidoglycan from bacteria simultaneously. And then the formed complex structural assemblies were isolated rapidly from the sample matrix by employing the magnetic force for fast and simple dual-model optical detection. In addition, the novel biosensor was successfully applied to discriminate and detect Escherichia coli , Salmonella , Staphylococcus aureus, and their mixture in contaminated milk with the classification rate of 97.2–100 %. The proposed multi-functional nano-platform was able to sensitively capture, detect, and kill foodborne pathogens in a complex system, which could be deployed successfully towards the monitoring of food safety.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Jianqiu Gong,Weiwei Zhang,Tapas Sen,Yichen Yu,Yuchen Liu,Jinlong Zhang,Lingzhi Wang
Photocatalysis is a promising technology to treat dilute phenol–Cr(VI) mixture, where photoinduced electrons are commonly thought of as the main active species for Cr(VI) reduction. However, it generally depends on the surface adsorption to achieve efficient electron transfer. Meanwhile, the possible contribution of reductive quinone derivatives oxidized from phenol to Cr(VI) reduction has been rarely explored. The key is to explicitly understand the relation between the phenol oxidation pathway and Cr(VI) reduction. Herein, Ag/AgCl/MIL-101(Fe) prepared by directly loading Ag nanoparticles on MIL-101(Fe) was applied to the joint treatment of phenol and Cr(VI). The role of quinone derivatives in reducing Cr(VI) was revealed by excluding the surface adsorption. During the phenol oxidation, •OH radicals were more consumed in the initial stage for the ring opening of phenol. Meanwhile, 1O2 evolved from •O2– gradually caused the accumulation of reductive quinone intermediates, which dramatically accelerated the Cr(VI) reduction afterward. This study demonstrates the significance of controlling the evolution process of active oxygen species for the joint photocatalytic treatment of phenol–Cr(VI) mixture.
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2021
·
IF 6.617
Hao Yuan,Ting Li,Yang Wang,Xiaofan Wang,Xuhui Zhang,Bihua Xia,Piming Ma,Tianxi Liu,Mingqing Chen,Weifu Dong
Thermal conductive polymeric composites are becoming more and more important in the rapid development of new generation electronic equipment, which can quickly dissipate the heat generated by the equipment to ensure their stable operation with high reliability. Nowadays, the most effective way to prepare thermal conductive polymeric composites is to incorporate efficient thermal conductive fillers into polymers. However, the large thermal resistance at interfaces and degradation of mechanical properties arising from the large filler content restrict their practical applications. Herein, surface modification of BNNS by polydopamine (PDA) was carried out to improve the interfacial compatibility and interaction between fillers and polymer matrix , a simple doctor blading method was adopted to prepare PVA composite films with an aligned structure. In addition, the decoration of silver nanoparticles on BNNS surface and the addition of small amount of GO can help to promote the continuity and reduce the defect of the filler skeleton. Thus, an increase in thermal conductivity (in-plane: 6.54 W m −1 K −1 , through-plane: 1.03 W m −1 K −1 ) was observed in PVA/BNNS-PDA-Ag (10 wt%)/GO (0.5 wt%) composite film, which also possessed excellent flexibility and a favorable mechanical property of 97.1 ± 5.1 MPa.
✓ 已验证
产品关联
DOI
高影响因子
Optical Materials Express
·
2021
·Vol. 11
·期 7
·2076-2088
·
IF 3.442
Chen Junfan,Chen Hongxian,Zhang Jie,Zhu Yong
Combining self-assembly technology and the thin-film annealing method, annealed Ag nano-islands (Ag NIs) with SiO2 microsphere (MS) arrays were prepared as surface-enhanced Raman scattering (SERS) substrate in this paper. A “top-binding” model was established to analyze the effect of SiO2 MS at different annealing temperatures and different Ag film thickness. The corresponding comparative analysis with and without MS templates have been carried on. We simulated the electric field enhancement, coupling enhancement spectrum and the optical focus function of SiO2 MS. Characterization and experiments showed that the use of a SiO2 MS array as a dewetting template can well regulate the size and morphology of Ag NIs. Among them, SiO2 MS-Ag-20 can achieve the most uniform particle size at an annealing temperature of 873.15 K. According to the UV-Vis absorption spectrum, it had an active SERS analytical enhancement factor (AEF) of ∼3.91×105 and good SERS reproducibility (relative standard deviation, RSD = 0.113) for R6G when the wavelength was 532 nm.
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Zihan Wang,Li Zhang,Yumin Hao,Wenjuan Dong,Yang Liu,Shengmei Song,Shaomin Shuang,Chuan Dong,Xiaojuan Gong
The fluorescent sensor, especially ratiometric fluorescent sensor, is one of the most important applications for CQDs , which is becoming a research hotspot. Herein, carbon quantum dots co-doped with nitrogen, phosphorus and chlorine (NPCl-CQDs) were synthesized by acid-base neutralization reaction exothermic carbonization method. The as-fabricated NPCl-CQDs could emit blue fluorescence and possess excellent fluorescence properties. Based on the FRET , multifunctional and ratiometric fluorescent sensors for “on-off-on” sequential determination of riboflavin , Ag + , and Cys with good selectivity and high sensitivity were established. The linear range of riboflavin, Ag + , and Cys are 0.50–10.18 μM and 15.89–27.76 μM, 0.66–1.46 mM and 1.50–4.20 mM, and 0.01–0.15 μM and 0.15–0.36 μM with the limit of detection of 3.50 nM, 26.38 μM, and 0.96 nM, respectively. Furthermore, the sensors were successfully used to determine riboflavin, Ag + , and Cys in tablets, river water, and human urine with the recoveries of 95.2–104.0%, 95.6–102.0%, and 94.8–106.4%, respectively. More importantly, the as-constructed “on-off-on” NPCl-CQDs-based ratiometric fluorescent sensors were applied for detecting riboflavin, Ag + , and Cys in HeLa cells with satisfying results. The finding of this study shows the feasibility and effectiveness of the NPCl-CQDs as the available ratiometric fluorescent sensors for the determination of riboflavin, Ag + , and Cys in real samples and living cells.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2020
·
IF 6.306
Yinshuang Song,Hai-Cai Huang,Wenhui Lu,Nianlu Li,Jie Su,Shi-Bo Cheng,Yongchao Lai,Jing Chen,Jinhua Zhan
Novel SERS substrates is urgently in demand for rapid and sensitive analysis of toxic agrochemicals from food. In this work, a monodispersed tungsten disulfide quantum dots modified silver nanosphere (Ag@WS 2 QD) was prepared and used as SERS substrate. Ag@WS 2 QD generated uniform and stable SERS signals within 2 min, displaying great promise in “mixing and reading” detection. Compared to unmodified colloidal silver nanoparticles, 4 times higher analytical enhancement factor was found in Ag@WS 2 QD. Density functional theory calculation verified the enhanced charge transfer within the coupling systems of molecule-Ag@WS 2 QD. Besides, the unique surface properties are beneficial for the enrichment of specific molecule. Both the chemical extraction and enhanced charge transfer contributes to rapid and sensitive SERS detection of Ag@WS 2 QD. A “mixing and reading” SERS method for thiram from honey and four kinds of juice was developed from Ag@WS 2 QD, showing great promise for rapid and direct SERS detection for toxic agrochemicals and further applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2020
·
IF 6.306
Hongbin Pu,Zhibin Huang,Fang Xu,Da-Wen Sun
The development of substrate with high sensitivity and good reproducibility for surface-enhanced Raman scattering (SERS) detection of contaminants in foods has attracted more and more attention. Herein, a stable two-dimensional (2D) Au-Ag core–shell nanorods (Au@Ag NRs) nanoarray substrate with high-performance SERS activity was developed based on interface self-assembly strategy and successfully applied to the detection of thiram in apple sample. A broad linearity range of 0.01–10 mg/L and a low limit of detection of 0.018 mg/L were achieved for thiram solution. The substrate was stable and exhibited satisfactory sensitivity after preserving at ambient temperature for 4 weeks. Furthermore, this method presented the comparable result to that acquired from high-performance liquid chromatography (HPLC) with satisfactory recoveries of 93–116%. The study indicated that the prepared Au@Ag NRs nanoarray substrate was promising for SERS detection of contaminants such as pesticides in foods.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Xiaohui Ren,Ming Jin,Xiaoxiang Feng,Xin Li,Yuhong Zhou
The performance of surface-enhanced Raman scattering (SERS) active substrates highly depends on its structure and components. Herein, for the first time, a novel zeolitic imidazolate framework-8 (ZIF-8)/Ag nanoparticles composite with flower-like architecture is demonstrated. By using tannic acid as structure-directing agent, well-controlled flower-like ZIF-8 could be obtained. Through in-situ reduction, Ag nanoparticles with uniform grain distribution were directly grown on the surface of ZIF-8 nanosheets. The synergy effects of preconcentration and plasmonic hot spot allow the picomolar detections and high reproducibility of the SERS method. As a result, the minimum detection limit of rhodamine 6G can be as 10 −14 mol L −1 and the stability and repeatability are satisfactory. This work provides a facile and general method to develop plasmonic ZIF-8 hybrid with controlled morphology for potential applications in bioanalysis, chemical sensing and catalysis.
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 18
·185605
·
IF 3.551
Wenjun Li,Chaoyun Ma,Yiju Song,Chenglin Hong,Xiuwen Qiao,Bincheng Yin
Sandwich-type electrochemical immunosensor was one of the main methods for detecting carcinoembryonic antigen (CEA). In this work, using Ce-MoF as the skeleton precursor, hyaluronic acid (HA) was coated on the surface of Ce-metal organic framework (Ce-MoF), which loaded with silver nanoparticles (Ag NPs) and horseradish peroxidase (HRP) to catalyze H2O2 and double amplified the current signal. Thus, a sensitive sandwich-type electrochemical immunosensor (Ce-MoF@ HA/Ag-HRP) was designed to detect carcinoembryonic antigen (CEA). The designed immunosensor used Au NPs to enhance the ability of attach more the first antibody (Ab1). This was due to Au NPs had good electrical conductivity and biocompatibility to accelerate electron transfer on the surface of the electrode. HA was riched in –COOH, –OH and had excellent biocompatibility, which can carry more Ag NPs to catalyze H2O2. Finally, the prepared sandwich-type electrochemical immunosensor had excellent biocompatibility and great catalytic performance. The immunosensor can be tested within 30 min and the logarithm of the current signal and CEA concentration showed a broad linear response range of 1 pg ml−1–80 ng ml−1, and the detection limit of CEA was 0.2 pg ml−1. More importantly, the proposed immunosensor had good reproducibility, selectivity, stability and without matrix effect. This confirmed that the proposed immunosensor had broad prospects in early clinical trials.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2020
·Vol. 12
·期 17
·2237-2243
·
IF 2.596
Yujiao Tu,Suping Wang,Xiaotian Yuan,Pengfei Song,Yunlin Wei,Kunhao Qin,Qi Zhang,Xiuling Ji
Novel fluorescent nitrogen and phosphorus-doped carbon dots (Aa N,P-CDs) derived from Auricularia auricula were successfully prepared via a simple hydrothermal method. The Aa N,P-CDs showed high selectivity and sensitivity in detection of 4-nitrophenol (4-NP) and Ag(I) and good linear ranges of 4-NP (0–37.5 μM, R2 = 0.9967) and Ag(I) (0–25 μM, R2 = 0.9934). The low detection limits were 198 nM and 74.35 nM, respectively. This showed that static quenching dominated in Ag(I) quenching of the Aa N,P-CD fluorescence, while that of 4-NP was the inner filter effect. The Aa N,P-CDs were successfully used to detect 4-NP and Ag(I) in real water and soil samples. Cell imaging indicated that Aa N,P-CDs showed low biotoxicity and good biocompatibility, which provided a new insight into bioimaging application and environmental pollutant detection.
✓ 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）