JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2019
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IF 2.752
Hongji Li,Yan Wang,Yue Li,Jinyue Zhang,Yu Qiao,Qingwei Wang,Guangbo Che
As a sensitive analytical technique, surface-enhanced Raman scattering (SERS) is widely used in spectral analysis, single molecule detection and biological/chemical sensors. Noble-metal nanostructures have sensitive SERS properties and usually act as SERS substrates. Moreover, semiconductors also possess SERS properties and when the semiconductors are combined with noble metals this can not only enhance the SERS signal but also introduce additional properties. Therefore, in this investigation, SiO 2 @TiO 2 @Ag composite materials are selected as SERS substrates, which not only increase the SERS property of substrates but also introduce the property of self-cleaning under conditions of UV light . The molecularly imprinted technique (MIT) is combined with SERS in this investigation to improve the disadvantage of traditional SERS substrates having low selectivity . Molecularly imprinted polymers (MIPs) have specific adsorption properties that can enrich the templates on the surface of SiO 2 @TiO 2 @Ag composites. Importantly, the MIPs can prevent the SERS substrate being oxidized, which effectively protects the core materials. Hence, SiO 2 @TiO 2 @Ag@MIPs is synthesized based on SERS and MIT for used in pyrethroid detection. The Raman intensity and fenvalerate concentration show a good linear relationship in the FE range of 1.0–100 nmol l −1 and the detection limit is 0.2 nmol l −1 . Furthermore, the SiO 2 @TiO 2 @Ag@MIPs present good selectivity and self-cleaning. This investigation provides a novel approach to pyrethroid detection.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2019
·Vol. 412
·期 4
·881-894
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IF 3.286
Xiao Li,Sun Qi,Zhao Qiang,Cheng Xinjian
The detection of heavy metals such as Hg 2+ and Ag + is important and urgent. In this work, – NO 2 /– NH 2 /C=S boron dipyrromethene small molecular derivatives were synthesized at first. Then they were incorporated into polymer chains. The macromolecular fluorescent probes were obtained via Sonogashira reaction using the small molecular probes as building blocks. The as-prepared small-molecule fluorescent probe BO3 exhibits high sensing performance for Hg 2+ . By introducing it into macromolecules, the sensing ability still remains, and even more, the recognition performance is improved. The macromolecular fluorescent probes P1 , P2 , and P3 also have high recognition ability for Ag + with a binding ratio of 2:1 (metal ion to probe ratio). Through the study of the sensing mechanism and the recycling experiments, it is found that the probes responded by the photo-induced electron transfer mechanism and can be recycled and reused. At the same time, BO3 , P2 , and P3 show excellent recognition performance for Hg 2+ in living cells and zebrafish. Living cell imaging experiments indicated that these fluorescent probes had good cell membrane permeability and low cytotoxicity, and could realize bioimaging of Hg 2+ . Therefore, the application value of these fluorescent probes could be enlarged.
Graphical abstract
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2019
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IF 2.931
Yongfeng Zhou,Pei Liang,De Zhang,Lisha Tang,Qianmin Dong,Shangzhong Jin,Dejiang Ni,Zhi Yu,Jiaming Ye
A stable substrate is extraordinarily important for the trace detection of Surface Enhanced Raman Scattering technique. We have designed in this paper a simple seed growth method to prepare Ag@ZrO 2 core-shell nanoparticles as well as regulate the core-shell ratio by adjusted concentration of zirconium propoxides added. The shell thickness effect and spacing on SERS activities have been simulated in different finite time domains, which goes perfectly with those previous experiment results. With Ag@ZrO 2 core-shell nanoparticles adopted as the SERS substrate and R6G as molecular probe , the detection range could reach as great as 10 -8 M. The regression model, obtained through principal component analysis, is adopted for some rapid and precise detection; and the determination coefficient (R 2 ) is going up to 0.9743, proving that the SERS substrate we have prepared has extremely high detection accuracy. To explore the stability of core-shell nanoparticles, we have taken both two different cases of strong acid solution as well as strong alkali solution for the core-shell nanoparticle etching, and this is how a SERS test could be carried out. These experimental results have indicated that the outer zirconia layer could keep the silver surface from oxidation and its stability is ensured, quite crucial for the applied SERS.
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CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Ying Xu,Jiaxiang Ma,Yu Han,Hongbo Xu,Yu Wang,Dianpeng Qi,Wei Wang
Solar-driven distillation is now considered as a rising technology for the supply of fresh water in the rare areas. As the crucial part of solar distillation, photothermal materials have been flourished investigated. Herein, we report a universal and facile method to construct a photothermal layer on various substrates to enhance the interfacial water evaporation via polypyrrole (PPy) polymerization and silver nanoparticles (Ag NPs) deposition. The photothermal Ag/PPy layer was firmly coated on six different substrates with an average solar absorption of 95.4% and Ag loading of 94.3 mg/L. One of the optimized resultant membranes (substrate is cellulose fibers) presents the ultrahigh solar evaporation rate of 1.55 kg m −2 h −1 and a corresponding light-to-vapor efficiency of 92.6% with a silver loading of 74 μg cm −2 . Bacterial diffusion inhibition zone experiments revealed clear antibacterial effects of the Ag/PPy membrane on bacteria. Furthermore, the Ag NPs deposited membrane had a rechargeability for multiple times upon their depletion, indicating sustainable anti-bacteria potential. Hence, our facial fabricated photothermal Ag/PPy layer can apply to substrates with different types for enhanced photothermal and anti-biocorrosion capacity, and may pave a new way to the long-term practical sustainable technique for the clean water production application.
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SENSORS AND ACTUATORS B-CHEMICAL
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2019
·
IF 6.393
Han Lu,Mingliang Jin,Qilin Ma,Zhibin Yan,Zhenping Liu,Xin Wang,Eser Metin Akinoglu,Albert van den Berg,Guofu Zhou,Lingling Shui
In this work, we report a quick and controllable method for fabricating Ag nanoparticles (NPs) and nano-assemblies (NAs) on silicon (Si) surface via a galvanic reaction assisted by surfactant hexadecyltrimethylammonium bromide (CTAB). Obtained Si substrates with high density Ag NAs serve as surface-enhanced Raman scattering (SERS) substrates for unlabelled molecular sensing. The addition of CTAB enables not only the electromagnetic enhancement by controllable producing Ag NAs “hotspots”, but also the signal enhancement by enriching probe molecules via hydrophobic interaction. Two concentration regimes of 1.0 × 10 −8 –1.0 × 10 −11 M and 1.0 × 10 −12 –1.0 × 10 −16 M have been obtained for quantitative and qualitative detection of Rhodamine 6G (R6G) in aqueous solution, respectively. As a result, for determination of R6G, the quantitative and qualitative detection limits of 1.0 × 10 −11 and 1.0 × 10 −16 M have been obtained, respectively, with high reproducibility showing the relative standard deviation (RSD) of ∼7.3%. Simulation has been carried out using finite-difference time-domain (FDTD) to evaluate the dependence of electric field on the size and inter-gap of Ag NPs, showing good agreement with experimental results. The high sensitivity also enables SERS characterization of non-resonant and low Raman cross-section biomolecules, for example, amino acids. Such a fabrication process is simple, fast, cheap and reproducible; and therefore, it would be helpful to produce high sensitive SERS substrates to broaden their applications in chemical and biological fields for molecular diagnostics to single-/multiple-molecule detection.
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CHEMOSPHERE
·
2019
·
IF 5.108
Feng Wei,Jiadong Li,Changchang Dong,Yajun Bi,Xiaojun Han
Photocatalytic disinfection with high performance is thought to be a promising way for water purification . Herein, plasmonic Ag doped urea-derived graphitic carbon nitride (g-C 3 N 4 ) composites were fabricated via in-situ photo-deposition at room temperature as the visible-light photocatalyst. Scan electron microscopy and transmission electron microscopy images showed the uniform dispersion of Ag nanoparticles on the surface of g-C 3 N 4 sheet, which facilitated the synergistic effect of antibacterial performance from Ag and photocatalytic property from Ag/g-C 3 N 4 composites. Photocatalytic water disinfection against Escherichia coli with visible light was performed to demonstrate the improved photocatalytic property with assistance of Ag. The 3-Ag/g-C 3 N 4 exhibited the best bactericidal performance by inactivating all bacteria within 120 min with damaged cell membranes of Escherichia coli observed by scan electron microscopy and transmission electron microscopy images. Photoluminescence spectra, steady-state surface photovoltage spectra, photocurrent response, and electrochemical impedance spectra results revealed that Ag nanoparticles inhibited the recombination of photo-generated e − and h + pairs and further reinforced the photocatalytic performance of g-C 3 N 4 . Scavenger experiments indicated that h + produced on valence band of g-C 3 N 4 dominated the photocatalytic disinfection process against Escherichia coli . This work further proved Ag/g-C 3 N 4 showed great potential in photocatalytic water disinfection under visible-light irradiation.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2022
·
IF 4.383
Yi Zhou,Zhiyue Chen,Jiaxin Li,Minghui Xiang,Yinghong Zhou,Jiangtao Niu,Jin Zhang
Design and construction of a heterojunction structured photocatalyst with efficient electron transfer is of great significance. In this work, we prepared a unique Z-scheme Ag/Agln 5 S 8 /BiVO 4 photocatalyst of which BiVO 4 has highly exposed (040) crystal facets. Ag as an electronic medium to build a special and efficient electron transfer path. In addition, the surface plasmon resonance effect of Ag improves the sunlight utilization of photocatalyst, and Ag as an electron transport medium and co-catalyst enhances the photocatalytic ability of the photocatalyst. Under optimum reaction conditions, the loading of AgIn 5 S 8 is 30%, the reaction rate constants of tetracycline degradation over Ag/BA-30% were 1.96 and 5.58 times of pure BiVO 4 and AgIn 5 S 8 . The possible Z-scheme electron-hole pair transfer mechanism was presented through the capture experiment. It is suggested that ·O 2 − , h + and ·OH are engaged in the degradation of TC. And the prepared photocatalysts were proved to have a potential application value after four consecutive cycles.
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TALANTA
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2022
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IF 6.556
Panwang Hu,Changkun Xia,Bangxiang Liu,Rulin Feng,Mengzhu Wang,Hengjia Zhu,Xiangheng Niu
Given the huge threat of Hg 2+ to human health, it is always significant to develop Hg 2+ monitoring tools. Utilizing its impacts on nanozyme catalysis is a promising strategy to realize Hg 2+ detection. However, nearly all the assays fabricated based on the principle should be performed in solution and in laboratory and require bulky signal reading instruments, hindering their wider applications. It is highly desired to develop portable, efficient, and practical Hg 2+ sensors. Herein, we proposed the in situ controllable growth of Ag nanoparticles (AgNPs) on paper to fabricate a smartphone optical nanosensor for highly sensitive Hg 2+ detection based on enzyme-mimetic activity stimulation. The ultrasmall AgNPs were directly grown on paper wafers to obtain test strips, which further integrated a 3D-printed holder and an APP built-in smartphone to fabricate the sample-to-answer sensor. The AgNPs-based test strips exhibited a target-stimulated peroxidase-like activity to catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine, and the chromogenic information was captured and processed by the smartphone to rapidly report the level of Hg 2+ . With the portable nanosensor, highly sensitive and specific detection of Hg 2+ was achieved, with a detection limit down to 0.44 nM. The sensor gathers the features of easy construction, simple operation, excellent capability, and robust performance together, promising great potential for rapid on-site analysis.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Xuechang Ren,Suying Ding,Renhua Chen,Zhenyu Yang,Miao Tian,Ning Fu
Although CuFe 2 O 4 has been widely used in the field of Fenton-like wastewater treatment, its ability to activate H 2 O 2 still needs to be further improved. In this context, a novel Ag x /CFO OVs (x represents the theoretical mass percentage of Ag) composite catalyst was prepared by the tartaric acid reduction method for the first time, and its degradation performance and degradation mechanism of Phenol in a H 2 O 2 -based Fenton-like system were investigated. Through a series of characterizations, the successful preparation of the catalyst was confirmed. The degradation experiment showed that the degradation rate of 50 mg/L Phenol by Ag 2 /CFO OVs /H 2 O 2 system was 98.55% within 15 min, which was a significant improvement in the degradation efficiency compared with that of CuFe 2 O 4 and CFO OVs . X-ray photoelectron spectroscopy (XPS) and electron spin resonance (ESR) confirmed the successful introduction of oxygen vacancies (OVs). Electrochemical impedance spectroscopy (EIS) showed that Ag 2 /CFO OVs had the lowest impedance, and the synergistic effect of OVs and Ag effectively enhanced the degradation capability of the catalysts for Phenol. The capture experiments of active species and ESR tests showed that the main active species of the Ag 2 /CFO OVs /H 2 O 2 system were 1 O 2 and • OH. This study provides a new reference for the introduction of OVs and Ag in Fenton-like catalysts and their application to wastewater treatment.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Hongxu Liu,Junhao Xie,Jingxuan Zhao,Ruijia Wang,Yuchao Qi,Shulin Sun
Traditional water treatment membranes always face the problem of membrane contamination in the practical application. Those contaminants deposited on the membrane surface and inside the membrane pores make the filtration process more difficult. Herein, the temperature and photo sensitive nanocomposite membranes with superior wasterwater separation and light-cleaning capabilities were prepared by a non-solvent induced phase separation method, which combined the thermo-responsive property of poly(N-isopropylacrylamide) (PNIPAAm) grafted polyvinylidene fluoride (PVDF) and the high photothermal conversion character of core–shell structured BN@PDA-Ag nanosheets. The membranes can be heated to high temperature within a short period of light exposure due to the fast photothermal conversion capability of Ag and the excellent thermal conductivity of boron nitride (BN). The increase in temperature led to the contraction of PNIPAAm chains and bigger pore size. The microstructure, filtration, and cleaning performance of the nanocomposite membranes can be controlled by illumination, which allowed PVDF-g-PNIPAAm/BN@PDA-Ag membranes to achieve the effect of first interception and then cleaning. The membranes showed retention rates of 82, 99 and 95 % for BSA, oil–water emulsions and various dyes with flux recovery rates of > 90 % after light cleaning. This work provides a simpler, more efficient membrane cleaning strategy with superior potential for dealing with membrane contamination.
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Chemosensors
·
2023
·Vol. 11
·期 10
·531
·
IF 4.2
Mingzhu Wu,Jianhang Lin,Da Zheng,Yirui Yang,Zhihao Li,Zhengdong Zhu,Yonghui Shen,Gang Ni,Maofeng Zhang
Micro/nanoplastics are widespread in the environment and may cause severe damage to creatures and human beings. Micro/nanoplastic pollution has become a global focus issue; hence, the rapid and accurate detection of micro/nanoplastics is an essential step to ensure health. Herein, we report a surface-enhanced Raman scattering (SERS) technique to sensitively and quantitatively identify micro/nanoplastics in environmental water samples. A three-dimensional hierarchical Au@Ag nanostar (NSs) was synthesized and employed as an efficient SERS substrate. The “lightning rod effect” generated by tip branches of the nanostars and the coupling effect of the neighboring branches of the nanostar array enabled the ultra-trace detection of crystal violet (CV) down to 10−9M, even with a portable Raman device. Moreover, the hydrophobic property of the SERS substrate endowed it with a desirable enrichment effect, which meant an increase in the concentration or quantity of the micro/nanoplastic particles. And thereafter, the SERS sensor achieved a highly sensitive detection of polystyrene (PS) particle standard solution at a low concentration of 25 μg/mL or 2.5 μg/mL. Importantly, the detected concentration and the SERS intensity followed a nearly linear relationship, indicating the capability of quantitative analysis of micro/nanoplastics. In addition, the SERS sensor was successfully extended to detect PS particles in environmental water samples, including tap water, sea water, and soil water, and the detection concentration was determined to be 25 μg/mL, 2.5 μg/mL, and 25 μg/mL, respectively. The present Au@AgNSs array substrate with a two-order magnitude signal amplification further exhibited significant advantages in the label-free analysis of micro/nanoplastics in real water samples.Keywords:surface-enhanced Raman spectroscopy (SERS);Au@Ag nanostar;lightning rod effect;micro/nanoplastics;quantitative detection
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Biosensors-Basel
·
2023
·Vol. 13
·期 10
·927
·
IF 5.4
Jian Ju,Lin Li,Bei Li,Sagar Regmi,Tingting Wang,Jiao Xu,Chaojie Li,Shixing Tang
Serological-sensitive testing of cholesterol holds significant value in the fields of healthcare and clinical diagnosis. This study reports on the preparation of peroxidase-mimicking nanozymes through the wrapping of N, S-doped carbon dots (DCDs) on the surface of silver nanoparticles (Ag NPs@DCD). The shell–core structure of Ag NPs@DCD displays peroxidase-mimicking capability, with the potential to catalyze inactive Raman probe molecules into the Raman reporters. Furthermore, a “shell-isolated nanoparticles-enhanced Raman spectroscopy” structure exhibited an enhanced Raman signal of reporter molecules. Ag NPs@DCD were utilized to create a label-free SERS sensing system for high-performance detection of cholesterol in serum samples. These results demonstrate the potential of the novel nanozyme-based SERS approach for clinical diagnosis.Keywords:cholesterol;doped carbon dots;silver nanocomposite;peroxidase-mimicking;Surface-enhanced Raman Spectroscopy (SERS);label-free assay
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