Nanoscale Horizons
·
2022
·Vol. 7
·期 5
·554-561
·
IF 11.684
Huiqin Liu,Junyi Zeng,Liping Song,Lingli Zhang,Zihai Chen,Jianhua Li,Zhidong Xiao,Fengmei Su,Youju Huang
Generally, a high quality surface-enhanced Raman spectroscopy (SERS) substrate often requires a highly-tailorable electromagnetic (EM) field generated at nanoparticle (NP) surfaces by the regulation of the morphologies, components and roughness of NPs. However, most recent universal approaches are restricted to single components, and integrating these key factors into one system to achieve the theoretically maximum signal amplification is still challenging. Herein, we design a triple SERS signal amplification platform by the coordination of spiky Au NPs with rich-tip nanostructures, controllable silver nanoshell, as well as tailorable surface roughness into one nano-system. As a result, the theoretical electromagnetic field of the interfacial self-assembled 2D substrate can be improved by nearly 5 orders of magnitude, and the ideal tracing capability for the model SERS molecule can be achieved at levels of 5 × 10−11 M. Finally, diverse analytes in pesticide residues, environmental pollutants as well as medically diagnose down to 10−11 M and can be fingerprinted by the proposed SERS nano-platform. Our integrated triple amplification platform not only provides an effective SERS sensing strategy, but also makes it possible to simultaneously achieve high sensitivity, stability as well as universality into one plasmonic-based SERS sensing system.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 13
·7056-7067
·
IF 4.682
Guan Meng,Xuan Yang,Gao Yating,Liu Yining,Zhang Shubiao
Bacterial infections are closely associated with tumor growth and metastasis. Bacteriostasis can not only inhibit the growth and metastasis of tumors during their early diagnosis and treatment but also prevent bacterial infections after recovery. In this study, we synthesized Ag@GQD which consisted of nitrogen-doped graphene quantum dots (N-GQD) wrapped around Ag NPs through the photocatalytic reduction method. Multifunctional nanoprobes (Ag/DOX@GQD) were obtained by doxorubicin (DOX) loading. Ag@GQD exhibited high stability, low cytotoxicity, and good photoacoustic imaging performance. The effective photothermal performance of Ag@GQD enabled us to achieve the controlled release of DOX from probes using near-infrared light and pH response during the treatment of tumors using chemo-photothermal combination therapy. Results from cell-based experiments revealed that combination therapy was superior to single-drug therapy. Besides, Ag@GQD could effectively kill Staphylococcus aureus and Escherichia coli and can be expected to inhibit the growth and metastasis of tumors caused by bacteria and in reducing bacterial infections after recovery.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
·
2022
·
IF 3.027
Hua Jiao,Jiechen Jin,Kang Zhao,Xue R Zhou,Xinyuan Zhang,Sen Song,Jia Wang,Yufei Tang,Guodong Cui
Barium titanate (BaTiO3) is a typical perovskite-type oxide with high dielectric constant, low dielectric loss, and excellent ferroelectric, piezoelectric, pyroelectric, and other properties. In view of the low photogenerated electron-hole separation efficiency of T-BT itself, it is proposed to prepare nanocomposites with good catalytic performance by compound modification with Ag. Considering repeated use, on the basis of powder catalysis, a porous block is prepared by compounding powder and organic polymer PVDF. In this study, the t-BaTiO3/Ag/β-PVDF composite material with porosity of ∼70.4% was prepared with the raw material of PVDF and piezoelectric t-BaTiO3/Ag. The mechanical and piezoelectric photocatalytic properties of the composite material was studied systematically. The piezoelectric coefficient d33 is 1.44 pC/N which can be explained by COMSOL simulation calculation. Moreover, the compressive strength is 1.76 MPa. The degradation MO and RhB results indicated that t-BaTiO3/Ag/β-PVDF composite material had good degradation and cycle stability.
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2022
·Vol. 414
·期 14
·4079-4088
·
IF 4.478
Xu Wei,Zhang Yu,Chen Hao,Dong Jinhua,Khan Ranjha,Shen Jianjun,Liu Honglin
Here, we developed a surface-enhanced Raman scattering (SERS) sensor based on functionalized Au@Ag core–shell nanorods (Au@Ag NRs) and cascade DNAzyme amplifier (CSA) for sensitive and accurate determination of microRNA-21 (miRNA-21). The as-prepared SERS nanoprobes were composed of a thiol-modification hairpin probe (HP2)–functionalized Au@Ag NRs and hairpin DNAzyme (HP1-Dz). Compared with original gold nanorods, the silver shell caused an enhancement of plasmonic properties, resulting in a significant enhancement of Raman signals. In the presence of target miRNAs, the hairpin construction of HP1-Dz changed due to DNA/RNA hybridization; subsequently, the DNAzyme-catalyzed cleaving process changed, and the Raman signals of the SERS nanoprobes gradually “turned off” with time elapse because of the dissociation of the Raman reporter from the surface of Au@Ag NRs. Hence, based on this principle, the proposed SERS sensor exhibited good linearity in the range 0.5 fM to 10 nM for miRNA-21 detection with a detection limit (LOD) of 0.5 fM. The proposed SERS platform has potential application in quantitative and precise detection of miRNA-21 in human serum. Graphical abstract
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Communications
·
2022
·
IF 3.662
Shixing He,Lieshan Wu,Yalin Zeng,Bing Jia,Liuling Liang
Modified biochar (Ce-Ag-BC) was successfully prepared by using Camellia oleifera shell and doping with cerium (Ce) and silver (Ag). Through the results of BET, SEM, XRD , FTIR, and XPS, Ce and Ag were successfully embedded on biochar and participated in the sulfathiazole (STZ) adsorption. After being modified, high adsorption capacity of STZ on Ce-Ag-BC was observed. The maximum adsorption amount of STZ on Ce-Ag-BC was 261.84 mg/g, which was increased by more than six times compared to raw biochar (BC, 42.41 mg/g). The adsorption kinetics and isotherm on Ce-Ag-BC could be better fitted to pseudo-second-order kinetic and Langmuir isotherm model, respectively, indicating that the adsorption is mainly controlled by chemisorption and can be described as a monolayer process. The STZ adsorption process on Ce-Ag-BC is a spontaneously endothermic reaction. Besides, the adsorption mechanism on Ce-Ag-BC mainly involves pore filling, π-π interaction, hydrogen bonding , and electrostatic attraction.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PHYSICS
·
2022
·
IF 2.552
Ying Lv,Kai Wang,Dongyang Li,Ping Li,Xuelian Chen,Weiwei Han
MXene has gradually become hot photocatalyst in recent years due to its unique properties. This work successfully synthesized rare Ag-doped partial etched Ti 3 C 2 T x /Ti 3 AlC 2 composite nanosheets via a reduction process. The obtained ternary Ti 3 C 2 T x /Ti 3 AlC 2 @Ag can be deemed a promising photocatalyst in photodegradation fields. Ti 3 C 2 T x /Ti 3 AlC 2 @Ag-50 exhibited excellent catalytic degradation performance towards methylene blue (MB), Rhodamine B (RhB) and methylene orange (MO), with the obtained degradation efficiency of 99.7%, 98.9% and 99.3%, respectively. Furthermore, there is a synergistic effect between Ag nanoparticles and partial etched Ti 3 C 2 T x /Ti 3 AlC 2 nanosheets, as demonstrated by the transfer of photogenerated carriers and the generation of reactive oxygen species, which can improve the catalytic degradation performance of the three organic dye molecules.
✓ 已验证
产品关联
DOI
高影响因子
Methods and Applications in Fluorescence
·
2022
·Vol. 10
·期 4
·045001
·
IF 3.849
Lingling Zheng,Yangyang Yan,Ning Wang,Mingli Li,Shaomin Shuang,Wei Bian,Martin M F Choi
Silver is widely used in medical materials, photography, electronics and other industries as a precious metal. The large-scale industrial production of silver-containing products and liquid waste emissions aggravate the environmental pollution. Silver ion is one of the most toxic metal ions, causing pollution to the environment and damage to public health. Therefore, the efficient and sensitive detection of Ag+ in the water environment is extremely important. Sulfur-doped carbon nitride nanosheets (SCN Ns) were prepared by melamine and thiourea via high-temperature calcination. The morphology, chemical composition and surface functional groups of the SCN Ns were characterized by SEM, TEM, XRD, XPS, and FT-IR. The fluorescence of SCN Ns was gradually quenched as the Ag+ concentration increased. The detection limit for Ag+ was as low as 0.28 nM. The quenching mechanism mainly is attributed to static quenching. In this paper, SCN Ns were used as the fluorescent probe for detecting Ag+. SCN Ns have successfully detected Ag+ in different environmental aqueous samples and cells. Finally, SCN Ns were further applied to the visual quantitative detection of intracellular Ag+.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS
·
2022
·Vol. 22
·期 12
·4595
·
IF 3.847
Haiyang Sha,Zhengkun Wang,Jie Zhang
In this paper, a monolayer SiO2microsphere (MS) array was self-assembled on a silicon substrate, and monolayer dense silver nanoparticles (AgNPs) with different particle sizes were transferred onto the single-layer SiO2MS array using a liquid–liquid interface method. A double monolayer “Ag@SiO2” with high sensitivity and high uniformity was prepared as a surface-enhanced Raman scattering (SERS) substrate. The electromagnetic distribution on the Ag@SiO2substrate was analyzed using the Lumerical FDTD (finite difference time domain) Solutions software and the corresponding theoretical enhancement factors were calculated. The experimental results show that a Ag@SiO2sample with a AgNPs diameter of 30 nm has the maximal electric field value at the AgNPs gap. The limit of detection (LOD) is 10−16mol/L for Rhodamine 6G (R6G) analytes and the analytical enhancement factor (AEF) can reach ~2.3 × 1013. Our sample also shows high uniformity, with the calculated relative standard deviation (RSD) of ~5.78%.Keywords:Raman scattering;SiO2microsphere array;Ag nanoparticles
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Yiying Yue,Kaiyang Hou,Jiayue Chen,Wanli Cheng,Qinglin Wu,Jingquan Han,Jianchun Jiang
A nanofiltration (NF) membrane containing a NaOH-treated electrospun polyacrylonitrile (HPAN) substrate, an interfacial polymerization (IP) polyamide (PA) layer, a chitosan (CS) coating layer, and an Ag/AgBr/AgVO3 photocatalyst loading layer was prepared. The structural evolution of the membranes was investigated, and their performance was estimated in accordance with the water flux and rejection rate. A probable mechanism for the photocatalytic activity of Ag/AgBr/AgVO3 was proposed. The loading of the Ag/AgBr/AgVO3 heterojunction on the HPAN/PA/CS NF membrane endowed the membrane with excellent self-cleaning properties owing to the photolytic degradation of the dye. The filtration and degradation processes of the Ag/AgBr/AgVO3-loaded membrane constantly promoted each other, and the treatment efficiency achieved with the integrated (filtration + degradation) process was superior to those obtained with the filtration and degradation processes alone. The Ag/AgBr/AgVO3-NF membrane exhibited excellent recyclability and stability when subjected to five integrated filtration–degradation processes. In addition, the Ag/AgBr/AgVO3-NF membrane exhibited an elastic modulus of 65.75 MPa and a toughness of 38.9 kJ/m3 along with a good disinfection effect on Escherichia coli in visible light. The as-prepared photocatalyst-loaded NF membrane with excellent antifouling performance, antimicrobial activity, high strength, and recyclability showed potential for continuous water purification operation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Tingting Song,Xiaoyan Meng,Huayu Wang,Chao Zhang,Ming Ge
Heterogeneous photocatalysis/persulfate oxidation process has been regarded as a promising technology for antibiotic contaminants removal. Magnetic ZnFe 2 O 4 /Ag composite catalyst was synthesized to activate peroxydisulfate (PDS) toward tetracycline (TC) degradation under the visible-LED-light irradiation. The synergistic effect of ZnFe 2 O 4 and Ag endowed the optimized ZFO/Ag-15 with excellent photocatalytic performance for PDS activation and TC degradation, and 90.06 % of TC (20 mg/L) was efficiently degraded after 80 min of reaction. Ag can enhance the visible light absorption of ZnFe 2 O 4 and accelerate the separation of photo-induced electron/hole pairs, thereby promoting the generation of O 2 − and SO 4 − radicals. In addition, Ag can directly activate PDS to generate SO 4 − . Although the catalytic performance of magnetic ZFO/Ag-15 gradually decreased after each cycle due to the corrosion of Ag and the formation of inactive AgO, the catalytic activity of used catalyst was partially recovered by heat treatment. Quenching experiments and EPR tests indicated that the free radical (O 2 − , SO 4 − and OH) and non-free radical ( 1 O 2 , h + ) oxidation processes cooperated to degrade TC in Vis-ZFO/Ag-15/PDS system. The effect of operational factors (PDS concentration, temperature, solution pH, coexisting inorganic anions and humic acid) on TC degradation was investigated, and TC removal from the different water matrices (river water, tap water and secondary effluent) was also evaluated. The degradation products were detected using LC-MS and the possible TC degradation pathways were established.
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2022
·Vol. 414
·期 22
·6611-6620
·
IF 4.478
Tang Yulian,Lv Xue,Gou Wenxin,Zhou Xuemei,Hao Junkai,Feng Jing,Qi Yuji,Hu Lei,Yan Zhengquan
Dopamine (DA) is an important neurotransmitter; however, any excess or deficiency of DA will cause several diseases in humans. To monitor DA efficiently and conveniently, a Ag nanozyme strengthened by bioactive folic acid (FA@AgNPs) was developed by homogeneous redox assembly. After the microstructure and performance were characterized in detail, it was noted that the proposed FA@AgNPs possessed superior peroxidase-like activity due to the ultra-small Ag nanoparticles and multiple amino, hydroxyl, and aromatic rings in FA. FA@AgNPs accelerated the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) with a low Michaelis constant ( K m ) and high maximal reaction rate ( V max ). Importantly, the characteristic absorbance intensity of FA@AgNPs-TMB-H 2 O 2 at 652 nm ( A 652 ) was exclusively deteriorated in the presence of trace DA, accompanied by a visual color change from blue to colorless. Under the optimized conditions (pH 4.0, 300 μL 1.5 mM TMB, 300 μL 1.0 M H 2 O 2 and incubated for 30 min at room temperature), there expressed an excellent linear relationship between lg A 0 / A 652 and c DA from 1.0 ×10 −8 to 6.67×10 −6 mol/L with a low limit detection of 7.1×10 −10 mol/L (S/N=3). When applied for monitoring of DA in real fruit juice and pharmaceutical samples, the recovery was between 96.6% and 104.9%, with RSD less than 2.2%. The enhanced peroxidase-like activity of the FA@AgNP system and its selective recognition mechanism for DA are also proposed. Graphical abstract
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2022
·Vol. 32
·期 9
·4270-4282
·
IF 2.036
Zhang Kaige,Ding Jianxiang,Ding Kuankuan,Xia Xinxin,Chen Liming,Ma Chengjian,Zhang Peigen,Sun ZhengMing
This work investigates the influence of sintering temperature on phase constitution, microstructure, and properties of Ti 2 AlC-reinforcing Ag-based composite. Part of active Al atomic layer in Ti 2 AlC migrates outward under the induction of relatively low sintering temperature (≤ 800 °C) and then generates the Ti-Al compounds and TiC. By means of elemental analysis, obvious Ag-Al inter-diffusion is detected at Ag-Ti 2 AlC interface at 900 °C and then Al-deficient layer forms around slightly dissociated Ti 2 AlC particles. At elevated temperature (950 °C), more significant interface diffusion and dissociation accelerate the decomposition and oxidation of Ti 2 AlC and subsequently generate mixture of titanium and aluminum oxides (Ti x O y , Al x O y ). The oxides’ agglomeration and residual Ti 2 AlC lead to form network-like and ravine-like structure. The moderate Ag-Al inter-diffusion slightly increases the resistivity (94.59 × 10 −3 μΩ·m), but contributes to improving the interface bonding and mechanical properties (106 HV hardness, 298.6 MPa tensile strength) of Ag/Ti 2 AlC at 900 °C. However, the severe Ti 2 AlC decomposition and oxides agglomeration account for the significant deduction in electrical conductivity (132.79 × 10 −3 μΩ·m) and mechanical properties (87 HV, 222.3 MPa) at 950 °C. A mechanism is proposed to further understand the phase transition, microstructure evolution, and interface reaction of the Ag/Ti2AlC with the elevated sintering temperature.
✓ 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）