Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 26
·6371-6379
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IF 5.066
Shuyuan Cui,Zhigao Dai,Qingyong Tian,Jun Liu,Xiangheng Xiao,Changzhong Jiang,Wei Wu,Vellaisamy A. L. Roy
Three-dimensional (3D) ZnO/Ag nanowire arrays (NWA) SERS substrates are fabricated by a screen-printing technique. The preparation of patterned ZnO NWA involves a two-step growth process. The ZnO nanoparticles-based ink is prepared and printed as seed layers, which are used as templates to fabricate patterned ZnO NWA via a hydrothermal method. During the screen printing process, the patterns of ZnO NWA are controlled by printing plates. The as-obtained NWA with uniform morphology was fabricated at 90 °C and exhibits hydrophilic and lipophilic properties. Subsequently, the sensitive 3D SERS substrates are fabricated through deposition of Ag nanoparticles (NPs) onto the surface of patterned ZnO NWA by magnetron sputtering. The detection limit of Malachite green (MG) can achieve 10−12 M with an enhancement factor of about 2.5 × 1010. Combined with the sensitivity and uniformity, the ZnO/Ag NWA is applied for the quick detection of low concentrations of molecules related to food safety, such as amoxicillin.
研究领域:
材料科学
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分析化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry B
·
2019
·Vol. 8
·期 4
·666-676
·
IF 5.047
Yan Zu,Liang Yan,Tao Wang,Dongqing Ma,Xinghua Dong,Zhen Du,Wenyan Yin
The non-invasive imaging of the gastrointestinal (GI) tract is highly desired for clinical research due to the various GI tract bacterial infection-induced diseases. To treat GI tract infections, various antibiotics have been used in the clinic. The growing problem of multidrug-resistant bacteria calls for effective antibiotic alternatives. Here, we construct a dual-functional Bi2S3@mSiO2@Ag nanocomposite for simultaneous enhanced X-ray computed tomography (CT) imaging and efficient antibacterial activity in the GI tract. The nanocomposite also has good stability, low cytotoxicity, and negligible hemolysis. Moreover, the investigation of the long-term toxicity and biodistribution of the Bi2S3@mSiO2@Ag nanocomposite after oral administration confirms its safety at the tested dosage. In particular, Ag nanoparticles (NPs) well dispersed on a silica substrate can reduce the antibacterial dosage and enhance the antibacterial activity of the Bi2S3@mSiO2@Ag nanocomposite. Furthermore, we have established bacterially infected enteritis animal models to confirm the antibacterial ability of the nanocomposite. This work opens up a new avenue for the design of a nanotheranostic agent that acts as both a contrast agent for the enhanced visualization of the GI tract and an antibacterial agent as an alternative to antibiotics.
研究领域:
医学影像学
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纳米医学
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感染病学
✓ 已验证
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 42
·20146-20153
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IF 3.925
Zhengxing Gong,Jing Luo,Xinrong Shao,Xu Sun,Huan Wang,Dan Wu,Dawei Fan,Yuyang Li,Qin Wei,Huangxian Ju
A novel quenching electrochemiluminescence (ECL) immunosensor for the trace detection of neuron-specific enolase (NSE) was developed. Doping CdS with Zn2+ to obtain ZnCdS not only significantly improves the original properties of CdS, but also can be loaded onto the surface of g-C3N4 to form a special complex structure, which effectively improves the ECL performance of g-C3N4. Rh0.6Ru0.4 alloys with flower-like structures were prepared by simple hydrothermal synthesis, with excellent electrical conductivity and catalytic performance. Due to its special flower-like structure with a large specific surface area, Ag nanoparticles can be uniformly loaded on its surface to form Rh0.6Ru0.4@Ag composites. Through spectral comparison, it was found that Rh0.6Ru0.4@Ag has strong UV-vis absorption in the ECL emission wavelength range of g-C3N4, which can generate resonance energy transfer, thereby effectively quenching the ECL signal. The immunosensor has a wide detection range with a detection limit of 16 fg mL−1 (S/N = 3), good stability and biocompatibility, and has great potential in clinical application.
研究领域:
分析化学
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生物传感器
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生物医学工程
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材料科学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2016
·Vol. 9
·期 2
·899-906
·
IF 7.76
Linxu Xu,Fang Cui,Jiajia Zhang,Yanjun Hao,Yan Wang,Tieyu Cui
Herein, an autocatalytic route to fabricate dual metal ion-equipped organic/inorganic hybrid silica, an ideal precursor for multifunctional silica-based composites integrated with well-dispersed Ag and Co3O4 nanoparticles was demonstrated. Significantly, by rational selection of reactants, such dual metal ion-equipped organic/inorganic hybrid silica can be synthesized through successive spontaneous reactions under near neutral conditions without an additional catalyst. Both the Ag+ and Co2+ ions are introduced into silica by chemical bonds, which favor the formation of small-sized and well-dispersed Ag and Co3O4 nanoparticles without aggregation in the entire silica matrix. After calcination, multifunctional silica composites equipped with well-dispersed Ag and Co3O4 nanoparticles were obtained. The as-obtained silica composites, as indicated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), have a spherical morphology and smooth surface. TEM tests also reveal the well dispersed fashion of Ag and Co3O4 nanoparticles. In addition, the obtained Ag–Co3O4@SiO2 composites exhibit good catalytic performance in the reduction of methylene blue (MB) with NaBH4 as a reducing agent, and can be readily recycled by an external magnetic field due to their superparamagnetic properties.
研究领域:
材料科学
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化学工程
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYST
·
2022
·Vol. 147
·期 7
·1385-1393
·
IF 5.227
Dongzhen Chen,Yang Li,Lijun Wang,Yingjie Wang,Pan Ning,Powan Shum,Xinhai He,Tao Fu
Biological surface-enhanced Raman scattering (SERS) sensing is dependent on the properties of the sensing surface. For the biological sensing surfaces for SERS, the hydrophilicity, biocompatibility and signal sensitivity are pivotal. Hence, a hard bimetallic Mo–Ag film was developed by a magnetron sputtering technique, and the surface morphology could be controlled by the relative contents of Mo and Ag. The Mo–Ag film has better hydrophilicity than the pure Ag film, which could be beneficial for cell attachment during biological SERS sensing. Moreover, the cell test shows that the Mo–Ag film exhibits good cytocompatibility with MC3T3-E1 cells, which shows potential for SERS detection in vivo. The high surface roughness of the Mo–Ag film is a fascinating feature for enhancing Raman scattering signals. Through depositing a thin film of Mo–Ag on a glass surface with a size of 0.5 × 0.5 cm2, a sensing chip of SERS could be produced. High sensitivity and excellent signal reproducibility were acquired. The sensitivity was down to 10−10 mol L−1 for malachite green and 10−9 mol L−1 for thiram, and the relative standard deviation value was lower than 7.0%. Moreover, bacteria were detected by employing the Mo–Ag film chip, and the difference in signal uniformity between molecules and bacteria is illustrated. In summary, depositing the Mo–Ag film on the surface of sensors could be an effective strategy for biomedical SERS sensing.
研究领域:
材料科学
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生物医学
·
分析化学
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Xuejiao Wang,Jiayi Dai,Xupeng Zhu,Xueyan Liu,Yufeng Tao,Erjin Zhang,Xudong Ren
The presence of hazardous substance in river water poses a severe threat to both the ecological environment and human health. Therefore, designing and preparing highly sensitive SERS platform for monitoring the hazardous substance is of great significance. Herein, the Ag nanoflowers (NFs)@ZIF-8 core-shell nanocomposite was synthesized and utilized as SERS substrate. Using crystal violet as model molecule, this substrate achieved a detection limit of 10 −10 M and superior uniformity with relative standard deviation of less than 15 %, and the enhancement factor (EF) for crystal violet was calculated about 4.37×10 6 . Besides, the SERS signal only showed a slight attenuation after 3 months storage. As a demonstration, the SERS platform achieved sensitive detection of two hazardous substances thiram and methylene blue with detection limits of 10 −7 M and 10 −8 M. And the recoveries of SERS detection for thiram and methylene blue in river water were between 70 % and 182 %. The electromagnetic enhancement provided by Ag NFs and the enriching effect of ZIF-8 shell collectively contribute to the excellent performance of the Ag NFs@ZIF-8 SERS platform. This work delivers a promising strategy for constructing hybrid SERS platform for highly sensitive detection.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Lan Zhang,Tingting Zhang,Shiying Wu,Lujie Li,Wei Li,Lingling Wang,Weihua Li,Xianhuai Huang,Jiansheng Li,Rui Lu
Although surface-enhanced Raman scattering (SERS) is a powerful spectral analysis technique, its practical application is restricted due to the poor chemical stability of some noble metal nanoparticles. In this work, Ag@ZIF-8 nanocomposites with different ZIF-8 core-shell thicknesses were prepared by coating AgNP surfaces with polyvinylpyrrolidone and adjusting the dosage of zinc nitrate and 2-methylimidazole. Several characterizations have confirmed that the Ag@ZIF-8 nanocomposites was successfully prepared. Based on transmission electron microscopy images and SERS spectral intensity, it was determined that Ag@ZIF-8 nanocomposites with a ZIF-8 shell thickness of 30 nm exhibited optimal SERS performance. As a result of evaluating the uniformity and stability of the composite with 4-ATP as the probe molecule, it showed a relative standard deviation of 6.91 % and a decrease in SERS intensity of 4.5 % after 28 days. Based on the results obtained with Ag@ZIF-8 nanocomposites as the SERS substrate, the detection limits of 4-mercaptopyridine and thiram were as low as 5.87×10 −9 M and 6.61×10 −8 M, respectively. Furthermore, the finite-difference time-domain simulation reveals an enhancement factor of 2.6×10 6 , which is in good agreement with the experimental value of 1.8×10 6 , confirming its effectiveness as a SERS substrate.
研究领域:
材料科学
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分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Songhao Luo,Zhigang Yi,Min Cheng,Biao Song,Chengyun Zhou,Wenjun Wang,Zhifeng Liu
It is challenging to produce soft polymer materials with high surface area and nanoscale morphology that can be used for continuous flow water treatment in a processable, versatile, and stable manner. Here, we manufactured a processable Ag@CMPA-bph and used it to treat pollutants in wastewater at continuous flow conditions. The aerogel was prepared by a simple reduction method of CMP matrix and Ag metal precursors. Thermogravimetric analysis and electron microscopy showed that the aerogel had excellent thermal stability and distribution of fine Ag nanoparticles. The synthesized aerogel inherits the controllable properties of the CMP matrix and can be tailored to a specific shape for installation into the water treatment unit. In continuous flow conditions, this aerogel shows excellent catalytic activity to efficiently treat the combined pollutant containing p- nitrophenol and methyl orange ( p- NP&MO), which can reach a removal rate of more than 99 % at the flow rate of 0.6 L h -1 . Furthermore, the Ag@CMPA-bph can also be used for continuous flow treatment of pollutants in river water sample and shows robust anti-pollution load capacity and catalytic activity.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Qiong Sun,Bing Han,Kaijing Li,Liyan Yu,Lifeng Dong
Photocatalytic fuel cell (PFC) is a novel energy conversion device that can effectively convert light into chemical energy and then electrical energy, accompanied with the pollutant purification treatment by photocatalytic technology. In this study, the synergetic photocatalytic degradation of organic dye in anode and the reduction of heavy metal Cr(VI) in cathode are carried out in an improved dual-chamber PFC device with TiO 2 and core–shell structured Ag@Fe 2 O 3 nanoparticles as photoanode and cathode materials , respectively. Among different materials, Ag@Fe 2 O 3 shows the highest catalytic activity to the reduction of Cr(VI) with an apparent kinetic constant of 0.058 min −1 , even much better than commercial Pt foil (0.027 min −1 ). From morphology and electrical characterizations, the excellent electrical conductivity of noble metal Ag and suitable conduction band positions between TiO 2 and Fe 2 O 3 lead to a rapid and directional transfer of photoinduced electrons, and the variable valence of Fe(II)/(III) in iron oxide facilitates continuous catalytic reduction of Cr(VI) to Cr(III). Moreover, the addition of H 2 O 2 into anode chamber can significantly accelerate the reactions and electricity output. The radical quenching tests prove that the existence of H 2 O 2 can efficiently increase the production of photoinduced carriers, and more oxidizing species (such as O 2 − and OH) can be produced from the reactions between H 2 O 2 and photoinduced holes or electrons.
研究领域:
环境科学
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材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2025
·
IF 6.4
Qin Zhang,Jiancong Liu,Dongxu Wang,Chengxu Jin,Li Fang,Xingyu Li,Yingjie Jiang,Xin Wang,Chungui Tian
The construction of strong metal-support interaction (SMSI) between ultrasmall metal nanoparticles and semiconductor supports remains a pivotal challenge in developing high-performance photocatalysts for selective CO2 conversion. Herein, we propose a coordination-induced in-situ confinement strategy that synchronously achieves high dispersion of small-sized Ag nanoparticles (Ag NPs) and SMSI with ultrathin C3N4. Through melamine-mediated Ag-N coordination bonds, this approach orchestrates three synergistic effects: (1) Coordination-induced confinement of Ag NPs (~3.3 nm) via covalent Ag-N linkages, yielding an increase in active site density and stability compared to conventional Ag/C3N4; (2) Enhanced electron transfer from C3N4 to Ag, extending carrier lifetimes and suppressing charge recombination; (3) Interfacial electronic redistribution that promotes the generation of *COOH intermediates, steering the reaction pathway toward CO with high selectivity. Furthermore, the coordination-induced thermal condensation induces nitrogen vacancies in C3N4, which act as molecular traps to enhance CO2 adsorption capacity and synergize with Ag sites for efficient CO2 activation. As a result, the optimized catalyst exhibits a remarkable CO yield of 70.63 μmol·g-1·h-1 without the use of sacrificial agents, along with high selectivity (> 98 %) and excellent stability. This work establishes a universal paradigm for engineering metal-semiconductor interfaces through coordination chemistry, offering transformative insights into solar-driven CO2-to-fuel conversion technologies.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Peilin Jia,Dongzhi Zhang,Xingyan Shao,Jieshuo Zhai,Jishun Guo,Zijian Wang,Xinyi Ji
Hydrogen (H 2 ), as a clean energy source, exhibits significant promise in the realm of new energy vehicles. Utilizing hydrogen sensors with rapid response and high selectivity is crucial for monitoring vehicles and preventing hydrogen leakage incidents. In this study, In 2 O 3 nanomaterials were synthesized via a hydrothermal approach and effectively modified with Ag/Cu bimetallic nanoparticles to fabricate high-performance hydrogen sensors. The optimal work temperature for the Ag/Cu–In 2 O 3 sensor is determined to be 300 °C. At this temperature, the sensor exhibited a response of 9.66–100 ppm H 2 , which is four times higher than the pristine In 2 O 3 sensor. Excellent H 2 selectivity and outstanding long-term stability were exhibited by the sensor in typical interference gas environments encountered in new energy vehicles. The significant enhancement in sensor performance is attributed to the electronic and chemical sensitization effects of Ag/Cu bimetals and the synergistic effects of bimetallic modification. Additionally, computational studies based on density functional theory (DFT) further elucidated the reasons for the improved H 2 gas sensing performance of Ag/Cu–In 2 O 3 nanocomposites. The Ag/Cu–In 2 O 3 nanocomposites show great potential for hydrogen detection applications in the sensor field.
研究领域:
材料科学
·
化学工程
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY
·
2024
·
IF 6
Junhan Xu,Binghong Chen,Kunpeng Yuan,Jun Shu,Qiguo Yang
Ag@SiO 2 nanofluid is widely used in spectral splitting PV/T system. Its core–shell structure has great influence on the optical properties. In this work, we focus on the comprehensive analysis and structure optimization of Ag@SiO 2 nanofluid to achieve its optimal spectral performance. DDA method is used to predict the optical properties of Ag@SiO 2 nanofluid and an optimization model based on filter efficiency is proposed. The effect of the SiO 2 shell thickness and Ag core mass concentration is analyzed. It indicates that the spectral performance of Ag@SiO 2 nanofluid can be improved with SiO 2 shell thickness of 15–40 nm and Ag core mass concentration of 81–135 mg/L. To achieve the same theoretical merit function of 1.46, the usage of Ag mass can be reduced by 25/33/44/62 % with SiO 2 coating of 10/20/40/70 nm. The optimal structure to achieve the highest filter efficiency η of 37.8 % is with a shell thickness of 20 nm and a mass concentration of 113.9 mg/L. An indoor PV/T operation testing is conducted to verify the optimization results. The merit function of Ag-based nanofluids increases from 1.58 to 1.598 and a reduction in Ag usage of 17 % is achieved with a SiO 2 coating shell of 17.8 nm. Operation stability is also enhanced with no aggregation observed during the working cycle and 7-day static experiment.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）