ANALYST
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2016
·Vol. 141
·期 20
·5864-5869
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IF 4.033
Ningning Zhou,Guowen Meng,Zhulin Huang,Yan Ke,Qitao Zhou,Xiaoye Hu
This report presents a simple and inexpensive fabrication approach to a flexible transparent composite film as a “cut-and-paste” surface-enhanced Raman scattering (SERS) substrate for in situ detection of organic pollutants. First, a self-assembled monolayer of Ag-nanocubes (Ag-NCs) is obtained at the air/water interface. Then, the Ag-NC monolayer is retrieved onto a flexible transparent polyethylene (PE) film to achieve an Ag-NC@PE composite film as a flexible SERS substrate. As the Ag-NCs in the monolayer are closely and uniformly packed on the PE film, the Ag-NC@PE composite film shows high SERS-activity with good signal homogeneity and reproducibility. Furthermore, the flexible transparent Ag-NC@PE composite film is “cut into” small pieces and directly “pasted” onto contaminated fruits for in situ SERS detection, as a result 10 nM thiram, 1 μM 4-polychlorinated biphenyl and 10 nM methyl parathion contaminants on oranges are detected, respectively. Therefore the Ag-NC@PE composite film is an inexpensive and effective SERS substrate for rapid in situ detection of organic pollutants in aqueous solutions, on fruits and other solid objects.
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ANALYTICAL CHEMISTRY
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2017
·
IF 6.32
Bingzhi Li,Lei Xu,Yue Chen,Wanying Zhu,Xin Shen,Chunhong Zhu,Jieping Luo,Xiaoxu Li,Junli Hong,Xuemin Zhou
Transcription factors (TFs) regulate gene expression by binding to regulatory regions, and their dysregulation is involved in numerous diseases. Thus, they are therapeutic targets and potential diagnostic markers. However, widely used methods for TFs detection are either cumbersome or costly. Herein, we first applied DNA-Ag nanoclusters molecular beacons (AgMBs) in TFs analysis and designed an assay based on the switchable fluorescence of AgMBs. In the absence of TFs, a single-stranded DNA functioned as a reporter is released from a double-stranded DNA probe (referred as dsTFs probe) under exonuclease III (Exo III) digestion. Then, the reporter triggers downstream Exo III-assisted signal amplification by continuously consuming the guanine-rich enhancer sequences in AgMBs, resulting in significant fluorescent decrease eventually. Conversely, the presence of TFs protects the dsTFs probe from digestion and blocks the downstream reaction to keep a highly fluorescent state. To testify this rationale, we utilized nuclear factor-kappa B p50 (NF-κB p50) as a model TFs. Owing to the amplification strategy, this method exhibited high sensitivity toward NF-κB p50 with a limit of detection of 10 pM, and a broad linear range from 30 pM to 1.5 nM. Furthermore, this method could detect multiple TFs in human colon cancer DLD-1 cells and reflect the variation in their cellular levels after stimulation. Finally, by conducting an inhibition assay we revealed the potential of this method for screening TFs-targeted drugs and calculating the IC50 of corresponding inhibitors.
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JOURNAL OF HAZARDOUS MATERIALS
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2016
·
IF 4.836
Ting Liu,Jiang Xue Dong,Shi Gang Liu,Na Li,Shu Min Lin,Yu Zhu Fan,Jing Lie Lei,Hong Qun Luo,Nian Bing Li
A stable silver nanoparticles/carbon quantum dots (Ag/CQDs) composite was prepared by using CQDs as reducing and stabilizing agent. The CQDs synthesized with polyethyleneimine (PEI) showed an extraordinary reducibility. When Hg 2+ was presented in the Ag/CQDs composite solution, a color change from yellow to colorless was observed, accompanied by a shift of surface plasmon resonance (SPR) band and decrease in absorbance of the Ag/CQDs composite. On the basis of the further studies on TEM, XPS and XRD analysis, the possible mechanism is attributed to the formation of a silver-mercury amalgam. Hence, a two dimensional sensing platform for Hg 2+ detection was constructed upon the Ag/CQDs composite. Based on the change of absorbance, a good linear relationship was obtained from 0.5 to 50 μM for Hg 2+ . And the limit of detection for Hg 2+ was as low as 85 nM, representing high sensitivity to Hg 2+ . More importantly, the proposed method also exhibits a good selectivity toward Hg 2+ over other metal ions. Besides, this strategy demonstrates practicability for the detection of Hg 2+ in real water samples with satisfactory results.
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JOURNAL OF LUMINESCENCE
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2016
·
IF 2.693
Hailun Wang,Weiju Zhu,Min Fang,Ying Xu,Cun Li
L-Glutathione (GSH) capped CdTe quantum dots (QDs) (GSH@CdTe QDs) have been successfully synthesized. GSH@CdTe QDs could selectively detect Ag + by fluorescence emission spectrometry in aqueous medium. The fluorescence intensity of GSH@CdTe QDs linearly increased upon increasing concentrations of Ag + . The detecting limit of Ag + was found to be 1.3 nM calculated from the linear concentration range of 0.02-0.2 μM. The other foreign mental ions displayed no significant response revealing good selectivity of the sensors towards Ag + . The experimental results indicated the GSH@CdTe QDs were well applied as fluorescence sensor to detect Ag + in aqueous with high sensitivity and selectivity. Furthermore, it was found that the enhancement of fluorescence intensity arose from the formation of Ag 2 Te which modified the surface traps on GSH@CdTe QDs.
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JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION
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2024
·
IF 3.6
Yu Jiang,Zhou Wan,Qi Liu,Xinxin Li,Bo Jiang,Mudan Guo,Pengjue Fan,Siyi Du,Doudou Xu,Chen Liu
Titanium (Ti) implants are widely used in orthopedic and dental applications due to their excellent biocompatibility and mechanical properties. However, bacterial adhesion and subsequent biofilm formation on implant surfaces pose a significant risk of postoperative infections and complications. Conventional surface modifications often lack long-lasting antibacterial efficacy, necessitating the development of novel coatings with enhanced antimicrobial properties. This study aims to develop a novel Ag-TiO2-OTS (Silver-Titanium dioxide-Octadecyltrichlorosilane, ATO) nanocomposite coating, through a chemical plating method. By employing a ‘resist-killing-disintegrate’ approach, the coating is designed to inhibit bacterial adhesion effectively, and facilitate pollutant removal with lasting effects. Characterization of the coatings was performed using spectroscopy, electron microscopy, and contact angle analysis. Antibacterial efficacy, quantitatively evaluated against E. coli and S. aureus over 168 h, showed a significant reduction in bacterial adhesion by 76.6% and 66.5% respectively, and bacterial removal rates were up to 83.8% and 73.3% in comparison to uncoated Ti-base material. Additionally, antibacterial assays indicated that the ratio of the Lifshitz-van der Waals apolar component to electron donor surface energy components significantly influences bacterial adhesion and removal, underscoring a tunable parameter for optimizing antibacterial surfaces. Biocompatibility assessments with the L929 cell line revealed that the ATO coatings exhibited excellent biocompatibility, with minimal cytotoxicity and no significant impact on cell proliferation or apoptosis. The ATO coatings provided a multi-functionality surface that not only resists bacterial colonization but also possesses self-cleaning capabilities, thereby marking a substantial advancement in the development of antibacterial coatings for medical implants.
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Journal of Materials Chemistry C
·
2024
·
IF 5.7
Zhiyuan Chen,Wenhui Chen,Peipei Han,Jizhou Yang,Zhi Wan,Peng Hu,Feng Teng,Haibo Fan
Compared with traditional photocatalytic materials, hollow nanofibers can show greatly improved photocatalytic efficiency due to their large specific surface area and more surface-active sites. In this work, one-dimensional (1D) hollow ZnGa2O4/ZnO nanofibers were successfully prepared by coaxial electrospinning technology first, and then the effect of Ag photodeposition on the photocatalytic degradation of tetracycline hydrochloride (TC-HCl) was studied. It is found that Ag can improve the light absorption of the Ag@ZnGa2O4/ZnO architecture, and meanwhile an S-scheme heterojunction forms between ZnGa2O4 and ZnO, which can synergistically increase the amounts and reduce the recombination of photogenerated carriers, thereby improving the photocatalytic degradation performance. By optimizing the ratio of different mass fractions of Ag, the maximum degradation rate can reach 0.0708 min−1, which is 22 times that of the TC-HCl self-degradation rate. This work not only provides a new idea for the preparation of a 1D hollow nanofiber heterojunction photocatalyst, but has also prepared an effective catalyst for photocatalytic degradation of TC-HCl.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Bo-hui Li,Kai-hua Zhang,Xiao-jing Wang,Yu-pei Li,Xinying Liu,Bao-Hang Han,Fa-tang Li
High-performance photocatalysts for catalytic reduction of CO 2 are largely impeded by inefficient charge separation and surface activity. Reasonable design and efficient collaboration of multiple active sites are important for attaining high reactivity and product selectivity . Herein, Cu-Cu 2 O and Ag nanoparticles are confined as dual sites for assisting CO 2 photoreduction to CH 4 on TiO 2 . The introduction of Cu-Cu 2 O leads to an all-solid-state Z-scheme heterostructure on the TiO 2 surface, which achieves efficient electron transfer to Cu 2 O and adsorption and activation of CO 2 . The confined nanometallic Ag further enhances the carrier’s separation efficiency, promoting the conversion of activated CO 2 molecules to •COOH and further conversion to CH 4 . Particularly, this strategy is highlighted on the TiO 2 system for a photocatalytic reduction reaction of CO 2 and H 2 O with a CH 4 generation rate of 62.5 μmol∙g −1 ∙h −1 and an impressive selectivity of 97.49 %. This work provides new insights into developing robust catalysts through the artful design of synergistic catalytic sites for efficient photocatalytic CO 2 conversion.
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ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Feiya Fu,Jiayuan Gu,Jinfeng Cao,Rongsheng Shen,Hanxiang Liu,Yanyan Zhang,Xiangdong Liu,Jinping Zhou
This work proposed a straightforward and sustainable strategy to synthesize a Ag/ZnO decorated cellulose nanocomposite. First, zincate was introduced into an aqueous cellulose–NaOH/urea dope to enhance the solution stability. Second, AgNO3 was directly added into the cellulose dope without gelation, and then was reduced into Ag NPs by cellulose chain. Finally, zincate transformed into ZnO via biomimetic mineralization along with the regeneration of the cellulose dope, and an Ag/ZnO decorated cellulose nanocomposite film was synthesized. The Ag NPs with a mean diameter of 16.5 nm were well dispersed in the cellulose matrix, and some were doped on the surface of the embedded ZnO crystal. With increase of the Ag loading, the nanocomposite film showed more rapid sterilization for Escherichia coli than Staphylococcus aureus, and complete eradication could be achieved within 3 h for both bacteria. This simple and environmental friendly method hopefully provided new routes for large-scale production of antibacterial cellulose-based nanohybrids in industry.
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Journal of Energy Storage
·
2024
·
IF 8.9
Zhubin Yao,Xiaowei Wu,Yueyu Zeng,Shuyao Li,Tieqiang Fu,Yunjun Luo,Guoqing Zhang,Wensheng Yang,Xinxi Li
Composite phase change materials (CPCMs) with significant amounts of latent heat can absorb and release at a constant transition temperature have attracted much attention in energy storage and electrical vehicles fields. Nevertheless, it is still a great challenge to utilize in battery thermal management system owing to low thermal conductivity and liquid leakage . Although many efforts have endeavored to improve transferring heat capacity, the thermal conductivity of CPCM is still need to explored. Herein, a novel high thermal conductivity and anti-leakage CPCM including polyethylene glycol, nano-Ag particles modified diatomite and expanded graphite (PDAE) has been designed and prepared. And the nano-Ag particles have evenly attached to the surface of diatomite through in-situ chemical reduction reaction and self-assembly technology. The experimental results indicate that PDAE exhibits excellent thermal conductivity with 1.91 W∙m −1 ∙K −1 owing to three-dimensional heat transferring network constructed by nano-Ag particles and expanded graphite. Moreover, it is no shape variation and leakage of PDAE under continuously heated at 60 °C for 2 h. In addition, the temperature performance of battery modules with the different CPCMs have been compared in detail, the results demonstrates that battery module with PDAE can be maintained below 53 °C and the temperature difference is effectively controlled within 5 °C even at 3C discharging rate after 10 cycles. With these prominent performances, this designed CPCM with high thermal conductivity will offer a promising insight into the passive thermal management system in practical application.
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ANALYTICA CHIMICA ACTA
·
2024
·
IF 5.7
Jing Feng,Lei Feng,Shuo Sun,Xujie Wang,Huitian Zhi,Ruhui Shang,Yingchao Yang,Luyao Wang,Zhengquan Yan,Lei Hu
Background NO 2 − and S 2− are two kinds of common toxic anions widely distributed in environmental water, soil and food products. Human beings have suffered a lot of diseases from intake of excessive NO 2 − or S 2− , i.e ., infantile methemoglobin , cancer and even to death. Although tremendous efforts have been afforded to monitor NO 2 − and S 2− , most were high instrument-depended with complex processing procedures. To keep food safety and to protect human health, it will be a huge challenge to develop a convenient and efficient way to monitor S 2− and NO 2 − in practice. Results A kind of folic acid capping Bi 3+ -doped Ag quantum dots (FA@Bi 3+ -Ag QDs) was developed for the first time by one-pot homogeneous reduced self-assembly. Not only did FA@Bi 3+ -Ag QDs possess intrinsic fluorescent property, it expressed synergistic peroxidase-like activity to catalyze the redox of 3,3′,5,5′-tetramethylbenzidine (TMB) and H 2 O 2 with K m / v max of 0.087 mM/6.61 × 10 −8 M s −1 and 6.42 mM/6.25 × 10 −7 M s −1 respectively. Interestingly, trace S 2− could exclusively alter its fluorescent property and peroxidase-like activity, exhibiting significant hypochromic and “turn-on” fluorescent effects. While trace NO 2 − could make FA@Bi 3+ -Ag QDs-TMB-H 2 O 2 system hyperchromic. Under the optimized conditions, FA@Bi 3+ -Ag QDs were applied for dual-mode recognition of S 2− and visual sensing of NO 2 − in real food samples with satisfactory recoveries, i.e ., 100.7–107.9 %/95.8–104.7 % and 97.2–104.8 % respectively. The synergistic enzyme-mimic mechanism of FA@Bi 3+ -Ag QDs and its selective response mechanisms to S 2− and NO 2 − were also proposed. Significance This represents the first nanozyme-based FA@Bi 3+ -Ag QDs system for dual-mode recognition of S 2− and visual sensing of NO 2 − , well meeting the basic requirement in drinking water set by WHO. It will offer a promising way for multi-mode monitoring of different pollution using the same nanozyme-based sensor.
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Journal of Energy Chemistry
·
2024
·
IF 14
Peng Wang,Shafidah Shafian,Feng Qiu,Xiao Zhang,Yuping Zhao,Bin Wu,Kyungkon Kim,Yong Hua,Lin Xie
2,2′,7,7′-Tetrakis( N , N -di(4-methoxyphenyl)amino)-9,9′-spirobifluorene (Spiro) is an essential hole-transport material used in perovskite solar cells (PSCs). However, the redox reaction of Spiro and its impact at the interface with the metal electrode are not yet fully understood. In this study, we introduced a crystalline additive (CA) to regulate the redox process of Spiro and its interface with an Ag electrode. Our findings indicate that CA functions as a molecular scaffold, improving the crystallinity and stability of radicals in Spiro throughout the entire redox reaction. This enhancement increases the hole mobility of Spiro and strengthens the internal electric field, thereby improving hole extraction and transport efficiency at both interfaces. Moreover, the optimized redox reaction of Spiro reduces energy loss at the Ag electrode, significantly boosting the power conversion efficiency to 25.21%. Furthermore, CA mitigates the aggregation of lithium salt and enhances the stability of the device. Our findings contribute to a deeper understanding of hole-transport mechanisms of Spiro and emphasize the importance of reducing energy loss at the Spiro/Ag electrode interface in PSCs.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2024
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IF 4.1
Keyan Liu,Wei Feng,Yanru Li,Donglai Han,Tianna Wu,Kaiyue Li,Shuo Yang
Surface-enhanced Raman spectroscopy (SERS) with enormous advantages has emerged as a powerful tool for both highly sensitive structural detection of analytes and various imaging applications. A notable advancement in the realm of multifunctional SERS substrates is the integration of magnetic nanoparticles endowed with magnetic manipulation capabilities and noble metal nanoparticles exhibiting plasmonic resonance properties. This synergistic combination offers substantial practical benefits for trace analysis across diverse fields. In this paper, a new paradigm of Fe 3 O 4 @PEI-DTC-Ag (Fe 3 O 4 @PD-Ag) photomagnetic nanocomposites based on magnetic Fe 3 O 4 nanoparticles (NPs), the noble metal silver quantum dots (Ag QDs) and the adhesive layer polyethyleneimine dithiocarbamate (PEI-DTC) for convenient recycling and ultrasensitive SERS detection was developed by engineering hydrothermal and seed-growth methods. The SERS performance of the Fe 3 O 4 @PD-Ag substrates with varying amounts of Ag was evaluated by detecting 4-aminothiophenol (4-ATP). Among the tested samples, Fe 3 O 4 @PD-Ag-4 with a silver solution volume of 200 ml exhibited the optimal performance, showcasing an enhancement factor ( EF ) of 4.418 × 10 5 . Moreover, the relative standard deviations (RSDs) were calculated to be less than 11.5 %, demonstrating the SERS substrates exhibit good uniformity and spectral reproducibility. Of note, the SERS substrate has demonstrated successful trace detection of thiram molecules, achieving a limit of detection (LOD) of up to 10 -9 M. The intensity of SERS signals shows a linear correlation with the logarithm of thiram concentration, ranging from 10 -4 to 10 -9 M, thus providing compelling evidence for quantitative detection. Importantly, the Fe 3 O 4 @PD-Ag-4 SERS substrate also showcases outstanding performance for detecting thiram in real food, underscoring its significant potential for application in food safety monitoring.
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