BIOELECTROCHEMISTRY
·
2019
·
IF 4.474
Mei Wu,Yuxiao Yang,Kaihang Cao,Chulei Zhao,Xiuwen Qiao,Chenglin Hong
In this study, a novel signal-amplified immunosensor was designed by using a microwave-assisted self-assembly method to synthesize ZnFe 2 O 4 -Ag/rGO nanocomposites. The conductivity of ZnFe 2 O 4 -rGO nanocomposites was significantly improved due to the effective inhibition of rGO accumulation by the insertion of ZnFe 2 O 4 and Ag nanoparticles (NPs) into graphene sheets. Excellent sensitivity and reproducibility were achieved through the microwave-assisted preparation of ZnFe 2 O 4 -Ag/rGO nanocomposites as a substrate, with the Ag NPs enhancing the signal because of the effective conductive matrix. The layer assembly process of the immunosensor was verified by cyclic voltammetry and electrochemical impedance spectroscopy. Under optimal conditions, the fabricated immunosensor showed good linearity over a wide concentration range from 1 pg mL −1 to 200 ng mL −1 with a low detection limit of 0.98 pg mL −1 , and exhibited excellent specificity, good stability, and reproducibility. These qualities can contribute to the successful application of a label-free immunosensor in the detection of AFP in human serum.
研究领域:
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Chemosensors
·
2024
·Vol. 12
·期 5
·82
·
IF 3.7
Minghui Yu,Chongyang Qin,Zhi Yu,Biao Sun,Dejiang Ni,De Zhang,Pei Liang
Surface-enhanced Raman scattering (SERS) provides an alternative rapid detection method for pesticide residues in food, but fenvalerate possesses poor affinity to the novel metal substrate, thus restricting its analysis. To break this bottleneck, a SERS-active platform with an Ag/rGO composite structure was engineered using a facile method for fenvalerate detection. Ag nanoparticles with a 60 nm diameter can grow evenly on the top and bottom of rGO layers under intense ultrasonic oscillation, and rGO in hybrid material acts as an ideal hotspot holder between the gaps of Ag nanoparticles, not only allowing the interaction area to be enhanced both electromagnetically and chemically but also enabling the capture and enrichment of fenvalerate pesticide molecules into the “hotspot” area to improve detection sensitivity. Ag/rGO composite substrate possesses superior SERS performance with an ultralow detectable concentration of 4-aminothiophenol (10−10M) and good reproducibility, endowing the material with a better enhancement effect than pure Ag nanoparticles. When used as the SERS substrate for fenvalerate detection, Ag/rGO composite material showed excellent performance in both experiments and theoretical calculation, with the limit of detection (LOD) of fenvalerate being as low as 1.69 × 10−5mg/kg and a detection model with an R2of 99.2%, demonstrating its exciting potential as a SERS substrate for pesticides detection.
研究领域:
分析化学
·
食品安全检测
·
纳米材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2018
·Vol. 32
·期 8
·e4428
·
IF 3.581
Songfang Zhao,Haobo Jiang,Jinhui Li,Xiangying Meng,Tianyu Chao,Zhe Zhang,Peng Zhang,Yongju Gao,Duxia Cao
Efficient and reusable nanocatalysts fabricated via a facile assembly are highly desirable for the cost-effective hydrogenation reduction. Inspired by a fishing process with a fishnet, multifunctional nanostructured catalysts are rationally designed to combine interesting features via the self-redox assembly of Fe 3 O 4 -Ag composites on reduced graphene oxide (rGO) (Fe 3 O 4 -Ag/rGO). In detail, Fe 3 O 4 nanoparticles (NPs) endow the ternary hybrids with superparamagnetism (21.42 emu g −1 ), facilitating catalysts to be separated from the reaction system. rGO could provide electron transfer pathways, enhancing catalytic activity. More interestingly, GO and Ag + could behave as oxidants to oxidize Fe 2+ for the in situ assembly of Fe 3 O 4 -Ag/rGO without any addition of reductant/oxidant or organic solvents, and AgNPs endow the ternary hybrids with excellent catalytic behaviour. Meaningfully, the bioinspired process enables the ternary hybrids to possess more abundant micro−/nanopores, larger surface area, and more amorphization. They exhibit exceptional catalytic performance, and could be recycled with excellent activity by means of convenient magnetic separation (at least 7 times). Moreover, the ternary hybrids could degrade methylene blue under UV light due to different valence states of Fe in Fe 3 O 4 . Therefore, the proposed bioinspired assembly and structure design for hierarchical catalysts would pave a promising way to assemble other catalysts.
研究领域:
材料科学
·
纳米生物学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
BIOELECTROCHEMISTRY
·
2019
·
IF 4.474
Pan Zhang,Tingting Sun,Shengzhong Rong,Dongdong Zeng,Hongwei Yu,Ze Zhang,Dong Chang,Hongzhi Pan
Long-term accumulation of organophosphate pesticides in environment presents a potential hazard to human and animal health. Towards this, a highly sensitive amperometric AChE-biosensor based on conjugated polymer and Ag-rGO-NH 2 nanocomposite has been successfully developed. First, 4, 7-di (furan-2-yl) benzo thiadiazole (FBThF) was electrochemically polymerized on the electrode surface. Then, Ag-rGO-NH 2 nanocomposite and acetylcholinesterase (AChE) are modified on the polymer membrane surface. In this way, a novel amperometric AChE-biosensor was successfully prepared. The as-prepared biosensor possessed excellent conductivity, catalytic activity , and biocompatibility which were attributed to the synergistic effects of poly(FBThF) and Ag-rGO-NH 2 and provided a hydrophilic surface for AChE adhesion. Under optimized conductions, the linear range was 0.099–9.9 μg L −1 with a regression coefficient of 0.9947 for malathion , 0.0206–2.06 μg L −1 with a regression coefficient of 0.9969 for trichlorfon . The detection limit is calculated to be about 0.032 μg L −1 for malathion and 0.001 μg L −1 for trichlorfon (S/N = 3). Moreover, the biosensor exhibited acceptable reproducibility and long-term stability, which makes it possible to provide a novel and promising tool for analysis of organophosphate pesticides.
研究领域:
分析化学
·
环境科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DIAMOND AND RELATED MATERIALS
·
2022
·
IF 3.806
Jixian Ma,Binxia Zhao,Xiaoxiao Fan,Wenjie Wang,Xingliang Chen,Nan Shao,Peiyang Jiang
An efficient Ag/rGO/Bi 2 WO 6 nanocomposite was synthesized by the precipitation-photoreduction method. The resulting Ag/rGO/Bi 2 WO 6 showed excellent photocatalytic activity for the photodegradation of Rhodamine B (RhB), with 15%Ag/rGO/Bi 2 WO 6 photodegrading 96.97% of RhB in 180 min, which was 1.28, 1.09 and 1.05 times higher than that of Bi 2 WO 6 , Ag/rGO, and rGO/Bi 2 WO 6 , respectively. The effect of noble metal Ag's surface plasmon resonance and Schottky barrier , as well as the superior electron transfer ability of rGO , dramatically improved photo-generated electron-hole pair separation and transfer efficiency. In addition, the effects of pollutant concentration, pH, and catalyst dosage on Ag/rGO/Bi 2 WO 6 photocatalytic performance also were explored. Furthermore, the free-radical trapping tests revealed that the primary active radicals in the catalytic system are hole (h + ), superoxide radical (•O 2 − ), and hydroxy radical (•OH). Additionally, after four recycling, the photocatalytic performance of the Ag/rGO/Bi 2 WO 6 composite did not show a significant decline. As a result of this research, the Ag/rGO/Bi 2 WO 6 catalyst, as developed, has a bright potential for environmental purifying.
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
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Jiaxin Liu,Mingdi Pan,Jiuzeng Jin,Yunshu Lu,Zhongmin Feng,Ting Sun
17β-E2 was the most active sterol estrogen and was widely used in animal husbandry for animal fattening and increasing milk production. Its abuse has resulted in residues in the environment. However, even very low concentrations could still enter the human body through the enrichment of the food chain and have adverse effects on the endocrine system. The SERS analysis method was employed in this work for the trace detection of 17β-E2 in environmental water. Cheap Ag NPs were selected as SERS sources. MoS2 provided a platform for the orderly arrangement of Ag NPs while making the material self-cleaning. rGO was coated in the outermost layer and had a protective effect on Ag NPs and could avoid oxidation during storage and use. At the same time, the target molecule could be adsorbed to reduce the distance between itself and Ag NPs, thus enhancing the SERS signal. The material had a high SERS enhancement factor (EF = 1.95 × 107), low detection limit (LOD = 5 × 10–12 M), good linear relationship (R2 = 0.994), good stability (RSD = 4.74%), and strong anti-interference ability. The recovery of 17β-E2 in farm wastewater samples was 100.15–108.00% and RSDs were 1.09–2.57%.
研究领域:
环境科学
·
分析化学
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Tao Li,Yuhua Li,Xike Zhang,Jiawei Yuan,Junkang Guo,Pan Wang,Gehong Wei,Chun Chen
The widespread application of metal-based nanoparticle (MNPs)/reduced graphene oxide (rGO) composites inevitably leads to their release into soils. However, we lack a detailed understanding of the bacterial community response to MNPs-rGO exposure in farmland soils. Here, we conducted a soil microcosm experiment to analyze the potential impact of MNPs-rGO on bacterial communities in two field soils via high-throughput sequencing. The change in alpha diversity of bacterial communities was more susceptible to Ag-rGO and ZnO-rGO treatments than CuO-rGO. In both soils, MNPs-rGO significantly changed the bacterial community structure even at a low dose (1 mg kg −1 ). The bacterial community structure was most strongly affected by Ag-rGO at 30 days, but the greatest changes occurred in ZnO-rGO at 60 days. The differences in soil properties could shape bacterial communities to MNPs-rGO exposure. Distance-based redundancy analysis and functional annotation of prokaryotic taxa showed that some bacterial species associated with nitrogen cycling were greatly influenced by Ag-rGO and ZnO-rGO exposure. In sum, Ag-rGO and ZnO-rGO may potentially affect bacterial communities and nitrogen turnover under long-term realistic field exposure. These findings present a perspective on the response of bacterial communities to MNPs-rGO and provide a fundamental basis for estimating the ecological behavior of MNPs-rGO.
研究领域:
环境科学
·
微生物学
·
土壤学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2024
·
IF 5.3
Pan Zhang,Changmei Wu,Lan Xie,Bai Xue,Yi Jiang
Considering the current challenges associated with fossil fuel scarcity and ice accumulation on solid surfaces, we propose a sustainable strategy that utilizes solar energy for ice formation, using a superhydrophobic coating possessing photothermal capabilities to tackle the challenges of icing and de-icing. We have successfully integrated the Fe 3 O 4 @SiO 2 @FAS/Ag-rGO composites into an epoxy matrix to create a photothermal superhydrophobic coating. The innovative coating boasts outstanding super-hydrophobicity with a water contact angle of 153.8°, resulting in a 60 μL water droplet experiencing a freezing delay of 1498 s at −20 °C ambient conditions, which is longer than that of pure EP coating. Additionally, the coating exhibits an impressive photothermal effect, raising the surface temperature to 58.8 °C under 1 sun. The coating also demonstrates rapid de-icing capabilities, clearing ice in just 120 s under 40 mW/cm 2 . By leveraging the light-trapping effect, utilizing the plasma resonance of silver, and incorporating a high surface roughness micro-nano hierarchical structure, the coating achieves exceptional photothermal conversion efficiency and anti-icing performance. Moreover, the coating's chemical and mechanical durability enhance its practicality and potential utility across various applications. In conclusion, this innovative superhydrophobic coating with photothermal properties offers a promising solution for various practical applications such as anti-icing and de-icing.
研究领域:
材料科学
·
能源科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2021
·
IF 4.556
Guangxin Lv,Beichen Shi,Hong Huang,Haodong Chen,Huajie Feng,Pan-Pan Zhou,Weichun Ye,Zhifei Zhang,Zhaoyong Yang
NiO nanoparticles (NPs) with small Ag NPs loading supported on reduced graphene oxide nanosheets (ternary NiO/Ag/RGO nanocomposites) were synthesized via a hydrothermal process followed by high-temperature calcination, extending the synergistic effects among noble metal, metal oxide and carbon materials. Based on ternary NiO/Ag/RGO nanocomposites, a new electrochemical sensor was fabricated for the detection of sunset yellow (SY) in soft drinks through cyclic voltammetry, Tafel plot and differential pulse voltammetry. The experimental conditions were optimized and kinetic parameters studied. Due to the synergistic effect of the ternary components, the prepared sensor exhibited superior electroanalytical performance toward SY detection, including wide linear range from 0.1 to 50 μM and from 50 to 450 μM, low detection limit of 13 nM, excellent specificity against various interfering colorants, good reproducibility and stability. Importantly, the electrochemical sensors was successfully employed for quantitative SY analysis in soft drinks with satisfactory recoveries, where the analyzed results were also in agreement with LC/MS analysis.
研究领域:
分析化学
·
材料科学
·
食品科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 41
·20513-20522
·
IF 9.931
Yunyun Huang,Aoxiang Xiao,Guanhua Hou,Hongtao Li,Tuan Guo,Bai-Ou Guan
An in situ strategy to understand the photocatalytic performance of Cu2O–Ag@rGO nanocomposites through interfacial photocatalysis on an optical microfiber has been proposed and experimentally demonstrated. The photocatalysts were conjugated on the surface of an optical microfiber immersed in an organic solution, forming an interface consisting of photocatalysts and organic molecules between the silica microfiber and the solution, which was within the evanescent field of the optical microfiber. In the photocatalytic process, the decomposition of organics changed the refractive index (RI) of the interface. The interaction between the evanescent wave and the microfiber interface modulated its optical spectrum. Therefore, the optical microfiber monitored the photocatalytic performance of the photocatalysts in real-time and in situ. The results reveal that the photodegradation efficiency of Cu2O–Ag@rGO was almost twice that of Cu2O, while the degradation rate constant was more than five times larger, because the coupling between the silver nanoparticles and reduced graphene oxide (rGO) enhanced the photocatalytic performance of Cu2O. By taking advantage of its miniature size and mechanical flexibility, the microfiber can directly probe a real matrix to study the local photocatalytic performance. This strategy is suitable for the evaluation of most photocatalysts and might provide a new perspective to assess the photocatalytic performance of the catalysts.
研究领域:
材料科学
·
光学
·
环境科学
✓ 已验证
DOI
高影响因子
Scientific Reports
·
2016
·Vol. 6
·期 1
·1-7
·
IF 5.228
Wu Dan,Liu Yixin,Wang Yaoguang,Hu Lihua,Ma Hongmin,Wang Guoqin,Wei Qin
Prostate-specific antigen (PSA) was used as the model, an ultrasensitive label-free electrochemiluminescent immunosensor was developed based on graphene quantum dots. Au/Ag-rGO was sythsized and used as electrode material to load a great deal of graphene quantum dots due to the large surface area and excellent electron conductivity. After aminated graphene quantum dots and acarboxyl graphene quantum dots were modified onto the electrode, the ECL intensity was much high using K 2 S 2 O 8 as coreactant. Then, antibody of PSA was immobilized on the surface of modified electrode surface through the adsorption of Au/Ag toward proteins, leading to the decrease of the ECL intensity. As proven by ECL spectra test and electrochemical impedance spectroscopy (EIS) analysis, the fabrication process of the immunosensor is successful. Under the optimal conditions, the ECL intensity decreased linearly with the logarithm of PSA concentration in the range of 1 pg/mL ~ 10 ng/mL. The detection limit achieved is 0.29 pg/mL. The immunosensor results were validated through the detection of PSA in serum samples with satisfactory results. Due to excellent stability, high sensitivity, acceptable repeatability and selectivity, the immunosensor has promising applications in disease and drug analysis.
研究领域:
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 43
·18558-18568
·
IF 2.7
Ali Baqaei,Ali Asghar Sabbagh Alvani,Hassan Sameie,Federico Rosei
We designed and fabricated a photocatalyst made of reduced titanium dioxide nanorods (TiO2−x NRs) that incorporates silver nanoparticles (Ag NPs) and reduced graphene oxide (rGO) sheets, to narrow the band gap and improve the photoinduced degradation of methylene blue (MB). The morphological characterization showed that Ag NPs and rGO sheets were well-deposited on both the top surface and the outer walls of vertically oriented 1D TiO2−x NRs. Energy dispersive spectroscopy and specific surface area analyses confirmed the presence of both Ag NPs and rGO sheets and the as-obtained TiO2−x/Ag/rGO sample exhibited a large specific surface area (153.7 m2 g−1). Moreover, X-ray diffraction patterns contained peaks characteristic of tetragonal rutile TiO2 and confirmed that there is no phase change after reduction treatment. The optical investigation revealed that the formation of Ti3+ ions, surface defects and oxygen vacancies were considered as major reasons for the red shift of the absorption edge towards the visible region (546 nm) compared with pristine TiO2 NRs. The incorporation of Ag NPs and rGO with TiO2−x NRs improved the light absorbance and the narrowing of the TiO2−x bandgap energy (from 2.95 to 1.97 eV) as a result of the SPR effect of Ag NPs and the reduced light reflection in the presence of rGO. Therefore, among the various as-prepared photocatalysts, the TiO2−x/Ag/rGO (2% wt) photocatalyst showed the best performance, degrading almost 100% of MB under 120 min visible light irradiation. Kinetic studies confirmed that degradation reactions over all photocatalysts followed first order kinetics. The photodegradation rate toward MB over TiO2−x/Ag/rGO (2% wt) is 6.45, 1.85, and 1.6 times higher compared to that of pristine TiO2 NRs, TiO2−x and TiO2−x/Ag, respectively. The TiO2−x/Ag/rGO composite proves to be an exceptionally efficient photocatalyst for water treatment.
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
危险品化学品经营许可证（带存储）