COLLOIDS AND SURFACES B-BIOINTERFACES
·
2024
·
IF 5.4
Qingling Nie,Peipei Xu,Jiajia Liu,Yanhanzhuo Wang,Qian Huang,Ruiyun You,Yunzhen Liu,Lizhi Li,Yudong Lu
To improve the sensitivity, accuracy and specificity of the assay, a two-dimensional silver substrate with EF=5.85×10 8 was first synthesized as a SERS substrate, on the surface of which DSP molecules were modified to form a DSP-antibody coupling through the activation of two N-hydroxy succinimide (NHS) esters to capture TNF-α. Subsequently, aptamerized silver-coated gold nanospheres (Au@TFMBA@Ag) were synthesized as Surface-Enhanced Raman Scattering (SERS) recognition probes. These probes were employed to create a sandwich structure for the quantitative detection of Tumor Necrosis Factor-alpha (TNF-α), utilizing the SERS signal intensity at 1374 cm −1 . Quantitative detection of TNF-α was successfully accomplished within the concentration range of 10 −4 to 10 −10 mg·mL −1 . Clinical serum samples were collected and subjected to testing. Significance analysis, conducted through the T-test (p < 0.0001), unequivocally showed the method's ability to differentiate between sera from normal individuals and those diagnosed with colon cancer.
研究领域:
生物医学
·
癌症检测
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
M.O. Abdel-Salam,Youngsoo Kim,Yasser M. Moustafa,Taeho Yoon
Green hydrogen is a crucial element in the hydrogen value chain, encompassing hydrogen production, transportation, storage, and application. The production of green hydrogen via NaBH 4 hydrolysis (SBH) entails a high cost. However, the fast kinetics of this process with a catalyst compensate for the substantial cost, especially in specific applications, such as local or intermittent use. Silver is known for its excellent catalytic properties. Its high catalytic activity is a key factor in achieving efficient hydrogen generation from (SBH). In this study, a nanocomposite catalyst composed of silver nanoparticles (AgNPs), CoFe 2 O 4 , and carbon nanotubes (CNT) was investigated to demonstrate an effective catalyst design approach to achieve enhanced hydrogen generation performance. The H 2 production rate in the presence of Ag-based/CoFe 2 O 4 –CNT was 320 mL min −1 g −1 , and the apparent activation energy was 14.7 kJ mol −1 , superior to that of Ag-based catalysts reported in the literature. Analyses of the observed outcomes revealed that the CNT was decorated with well-dispersed AgNPs and CoFe 2 O 4 nanoparticles. The synergistic effects of AgNPs, CoFe 2 O 4 , and CNT were demonstrated by analyzing the kinetic behaviour of each component based on systematic comparisons. Furthermore, the paramagnetic property of CoFe 2 O 4 enables harvesting of the catalyst using an external magnetic field, and it was verified that the reactivity of the collected catalyst was maintained throughout seven successive cycles. The outstanding catalytic performance of Ag/CoFe 2 O 4 – CNT should be attributed to the uniform dispersion of nanoparticles on the CNT surface. Furthermore, our key approach for developing efficient Ag-based carbon advanced catalysts for SBH in the future is to ensure their suitability for industrial applications.
研究领域:
材料科学
·
催化化学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Beibei Zhang,Junshen Liu,Ru-Song Zhao,Qiming Xian
Nitrosamines , which are emerging nitrogenous disinfection by-products, have raised great concern owing to their carcinogenicity and genotoxicity. Thus, exploring efficient materials to remove nitrosamines from the environment is of vital importance. In this work, NaBH 4 was taken as a reducing agent and Ag-based metal organic nanotubes (Ag-MONTs) were impregnated in FeSO 4 ·7H 2 O to prepare nanoscale zero-valent iron (nZVI) supported on the nanotubes (nZVI@Ag-MONTs). The new material was then characterized and applied to N -dimethylnitrosamine (NDMA) adsorption and degradation in water. The material had excellent ability to adsorb and degrade NDMA, and the total concentrations of iron and silver remaining in water did not exceed standard limits after 120 min of adsorption. Coexisting substances, such as NO 3 − , Cl − , CO 3 2− , humic acid , trichloromethane, and trichloronitromethane, did not affect the NDMA removal efficiency of the adsorbent. The NDMA removal efficiency of the new material exceeded 88% even in the presence of SO 4 2− and PO 4 3− . The NDMA degradation mechanism of nZVI@Ag-MONTs included a catalytic hydrogenation reaction and resulted in dimethylamine as the final degradation product . The nZVI@Ag-MONTs showed favorable stability and reusability. Taking the results together, the nZVI@Ag-MONTs proposed in this work are applicable to NDMA adsorption and degradation in water.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2023
·
IF 6.1
Tingting Zhang,Gongying Wang,Juan Bao,Chang Liu,Weihua Li,Zhe Kong,Xiuyun Sun,Jiansheng Li,Rui Lu
A crucial issue in analytical science and physiology is the detection of histamine with high sensitivity, specificity and credibility, which served as an important neurotransmitter in biofluids. Despite the high sensitivity of surface-enhanced Raman spectroscopy (SERS) at the level of single molecule, there are still challenges in providing high sensitivity for histamine with a small cross section. For the selective detection of histamine using SERS, a highly sensitive sandwich structure substrate combining Fe 3 O 4 and an Ag-based SERS nanotag was developed. The Fe 3 O 4 @SiO 2 –COOH served as a capture component for enriching histamine. Upon functionalized Ag nanoparticles with glycine (Gly) and (3-Aminopheyonyl) boronic acid (APBA), they were then used to connect with histamine and serve as a SERS nanotag, respectively. A linear relationship between the Raman intensity and the histamine concentration was observed over the range 10 −4 -10 −8 M with a limit of detection of 7.24 × 10 −9 M. This methodology also exhibited good selectivity in the presence of other neurotransmitters. With our new approach, histamine can be detected sensitively and reliably in fish samples, which indicates the potential prospect of an effective method for analyzing histamine in complex specimens.
研究领域:
分析化学
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Electronic Materials
·
2024
·
IF 4.3
Chuncheng Wang,Hiroaki Tatsumi,Liang Xu,Tao Zhao,Pengli Zhu,Rong Sun,Hiroshi Nishikawa
Simplifying the bonding technique used to package power devices is crucial for electric vehicles and 5G communication. Herein, a transparent liquid Ag-based complex was employed to simplify the Ag sintering process. The complex can directly fabricate Ag nanostructures on substrates and dies by thermal decomposition at 180 °C for 30 min. These nanostructures consisted of linked nanoparticles with a wide size distribution and exhibited remarkable compressibility, indicating an excellent potential for sintering. Unlike traditional Ag paste, the Ag-based complex presented a single phase, and the obtained Ag nanostructures could be directly sintered at a low temperature. Robust sintered Ag joints with a high average shear strength of 45.4 MPa and a low porosity of 9.3% were successfully achieved by sintering at 300 °C and 5 MPa for 40 min. Such joint properties can be attributed to the frame–filler structure generated during sintering. This structure, which featured large Ag particles acting as frames and small Ag particles acting as bridges linking the frames, was beneficial for improving the sintering performance of the Ag nanostructures. The Ag-based complex could be used for the facile preparation of robust sintered Ag joints, creating possibilities for die attachment while reducing manufacturing costs.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Laser & Photonics Reviews
·
2024
·
IF 9.8
Xuemin Wen,Maksym Buryi,Vladimir Babin,David John,Romana Kučerková,Martin Nikl,Qian Wang,Yunyun Li,Wen Li,Fan Yang,Xiaoping OuYang,Yuntao Wu
The development of ultrafast scintillators is critical to the GHz X-ray and time-of-flight (TOF) imaging techniques. Low-dimensional silver-based halides have emerged as promising candidates due to high radioluminescence efficiency and ultrafast decay time. However, the ultrafast scintillation mechanism in silver-based halides, such as Rb 2 AgBr 3 (RAB), remains controversial. Here, the study reveals the origin of ultrafast scintillation timing response in melt-grown RAB bulk crystals. The RAB shows light-yellow emission with a photoluminescence quantum yield (PLQY) of 13.9%. Under the picosecond (ps) pulse X-ray irradiation, RAB has an ultrafast decay time of 3.2 ns that accounts for 40.5% of the total emitted light. The light yield is estimated as 3100 photons MeV −1 under 22 Na irradiation. Based on the temperature-dependent radioluminescence (RL) spectroscopy, electron paramagnetic resonance (EPR) spectroscopy, and spectrally resolved thermally-stimulated luminescence (TSL) glow curves, it is confirmed that the bromine vacancy as the F-center is the origin of the ultrafast scintillation component. These findings provide elaborated and fundamental insights into the ultrafast luminescent mechanisms of low-dimensional silver-based halides, thereby opening up new design horizons in the development of ultrafast scintillators.
研究领域:
材料科学
·
光学
·
辐射探测
✓ 已验证
DOI
高影响因子
POLYHEDRON
·
2018
·
IF 2.067
Xiao-Long Zhang,Gui-Mei Tang,Yong-Tao Wang
In this paper, three Ag-based metal coordination polymers have been synthesized, namely, [Ag( BS )( BPP ) 2 ] ( 1 ), [Ag( MBS )( BPP ) 2 ] ( 2 ), and [Ag( ABS )( BPP ) 2 ]·H 2 O ( 3 ) ( BS = benzenesulfonate, MBS = p -toluenesulfonate, ABS = p -aminophenyl sulfonate, BPP = 1,3-bis(pyridine-4-yl) propane). Metal coordination polymer 1 – 3 were structurally characterized by X-ray single-crystal diffraction, IR spectra, thermogravimetry analysis (TGA), and X-ray diffraction (PXRD). Through the X-ray single-crystal diffraction analyses, metal coordination polymers 1 and 2 exhibit one-dimensional structural motifs. Interestingly, metal coordination polymer 3 display the mixed one-dimensional and two-dimensional structures. Their thermogravimetric behaviors have been studied. Additionally, the luminescent properties of metal coordination polymers 1 – 3 were investigated in the solid-state at room temperature in details, which display the maximal emission peaks located at 388, 334 and 450 nm, respectively.
研究领域:
材料化学
·
配位化学
✓ 已验证
产品关联
DOI
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.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2024
·Vol. 35
·期 36
·365301
·
IF 2.9
Lisha Fan,Xianwei Tang,Shuowen Zhang,Ling Wu,Tianzhen Zhao,Xiaoyu Ding,Huaping Wu,Jianhua Yao
Multi-photon reduction (MPR) based on femtosecond laser makes rapid prototyping and molding in micro-nano scale feasible, but is limited in material selectivity due to lack of the understanding of the reaction mechanism in MPR process. In this paper, additively manufacturing of complex silver-based patterns through MPR is demonstrated. The effects of laser parameters, including laser pulse energies and scanning speeds, on the structural and chemical characteristics of the printed structures are systematically investigated. The results show that the geometric size of printed cubes deviates from the designed size further by increasing laser pulse energy or decreasing scanning speed. The reaction mechanism of MPR is revealed by studying the elemental composition and chemical structures of printed cubes. The evolution of Raman spectra upon the laser processing parameters suggests that the MPR process mainly includes two processes: reduction and decomposition. In the MPR process, silver ions are reduced and grow into particles by accepting the electrons from ethonal molecules; meanwhile carboxyl groups in polyvinylpyrrolidone are decomposed and form amorphous carbon that is attached on the surface of silver particles. The conductivity of silver wires fabricated by MPR reaches 2 × 105 S m−1 and stays relatively constant as varying their cross section area, suggesting excellent electrical conduction. The understanding of the MPR process would accelerate the development of MPR technology and the implementation of MPR in micro-electromechanical systems could therefore be envisioned.
研究领域:
材料科学
·
微纳米制造
·
光学工程
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2018
·
IF 2.21
Xuan Hao,Xianhui Wang,Simin Zhou,Hui Zhang,Mabao Liu
To reduce the aggregation of graphene, Ag particles were introduced in the graphene nanosheets by chemical reduction method, and the silver matrix composite reinforced with Ag-doped graphene nanosheets were fabricated by powder metallurgy . The synthesized Ag-doped graphene were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy (Raman) and X-ray photoelectron spectroscopy (XPS), and the relative density, hardness along with electrical conductivity of the silver matrix composite reinforced with Ag-doped graphene were measured as well. The results show that silver ions and graphene oxide can be effectively reduced by ascorbic acid simultaneously, most of oxygen functional groups on the Ag-doped graphene sheets can be removed dramatically, and Ag-doped graphene inhibit the graphene aggregation effectively. Compared with pure Ag, the hardness of the 0.5 wt% Ag-doped graphene reinforced sliver matrix composite is increased by 35.1% and the electrical conductivity reaches up to 98.62% IACS (International Annealed Copper Standard). However, excessive addition of Ag-doped graphene is not beneficial for the improvement on the hardness and electrical conductivity of silver matrix composite.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Ling Zhang,Shichao Han,Yingjuan Wu,Yiquan Xie,Liang Wang,Xiangju Meng,Feng-Shou Xiao
Removal of formaldehyde (HCHO) has recently been attracted much attention, and completely catalytic oxidation at room temperature has been identified as one of the efficient routes for solving this problem. In this research, we show a successful preparation of Ag-loaded octahedral molecular sieve from solvent-free route (Ag/OMS-2-S), which was characterized by XRD, SEM, HRTEM, BET, XPS, ICP-OES, H 2 -TPR, and HCHO-TPD techniques to investigate the factors influencing the catalytic activity. Very interestingly, HCHO is completely converted into CO 2 at room temperature over the Ag/OMS-2-S catalyst. To the best of our knowledge, this is the first time for complete oxidation of HCHO at room temperature over all the Ag-based catalysts. Relating to the characterizations, it is suggested that the active oxygen species play a key factor that contributes to the excellent performance of the Ag/OMS-2-S. In addition, the Ag/OMS-2-S catalyst is also very stable and selective. Combination of extraordinary activity and excellent stability of the Ag/OMS-2-S catalysts might offer an alternative way to develop new efficient catalysts for the removal of air pollutants.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS TODAY
·
2022
·
IF 6.562
Xiaotong Li,Xufei Shao,Zhisheng Wang,Jinzhu Ma,Hong He
Catalytic decomposition is a promising method of ozone (O 3 ) removal, and Ag-based catalysts have shown excellent O 3 decomposition performance. In this study, the chemical states of Ag species were successfully regulated by varying the loading of Ag and the particle size of α-Fe 2 O 3 supports, and the O 3 decomposition performance of different Ag species (monatomic Ag, Ag clusters (1–2 nm), small Ag nanoparticles (3–5 nm), large Ag nanoparticles (7–12 nm)) was determined. The changes undergone by Ag species after exposure to ozone were characterized in detail, and the ozone decomposition performance of the corresponding Ag species was determined. The terminal and doubly bridging hydroxyl groups on the Fe 2 O 3 support were determined to be the anchoring sites for Ag species. The Ag species and Fe 2 O 3 support are connected through oxygen bridges, forming Ag-O-Fe linkages. This study provides guidance for understanding the mechanism of the interaction between metals and supports and follow-up development of high-efficiency Ag-based catalysts.
研究领域:
催化化学
·
环境科学
✓ 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）