JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Peibo Li,Guoqiang Luo,Xiaoshan Zhang,Xiao Wang,Zhihao Wu,Yi Sun,Qiang Shen
As one of the most commonly used binary alloys , the effect of intermetallic compounds (IMCs) of Al-Cu alloys in powder metallurgy on their structure and properties is instructive for tailoring Al-Cu alloys for different applications. In this investigation, a series of Al-Cu-Ag alloys with varying Cu compositions were fabricated via hot pressing. TEM analysis identified CuAl 2 as the primary intermetallic compounds , with Ag existing in forms including Ag 2 Al, elemental Ag, and an Ag-(Cu) solid solution . The modulation of Cu content influenced the state of Ag and the mechanical behaviors of the Al-Cu-Ag alloy. Particularly, the high Al/Cu alloy, benefiting from a synergistic effect comprising stacking faults, nanoscale precipitates, and solid solutions, exhibited outstanding mechanical properties. Conversely, the Al-50Cu-3Ag alloys displayed significant brittleness , attributed to the adverse impact of large-scale intermetallic compounds and increased grain size due to the formation of CuAl 2 . The incorporation of nanoparticles effectively mitigated the grain size in high Al/Cu alloys. This study elucidates the correlation between the evolution of intermetallic compounds and composition in Al-Cu alloys, offering novel insights into the reinforcement of both Al-based and Cu-based alloys.
研究领域:
材料科学
·
金属学与热处理
·
粉末冶金
·
结构材料
·
合金设计
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2021
·
IF 8.067
Lin Zhang,Nuomei Li,Qiuchen Ma,Jiahui Ding,Chuang Chen,Zhaocheng Hu,Weiwei Zhao,Yufeng Li,Huanhuan Feng,Mingyu Li,Hongjun Ji
A series of large-area, flexible and transparent ultraviolet (UV) photodetectors (PDs) based on Ag nanowire (NW)@ZnO nanorods (NRs) are fabricated by an inexpensive, facile and effective approach. These Ag NW@ZnO NRs are successfully synthesized using a two-step method in an oil bath with a high surface-to-volume ratio and good crystallinity. The PDs are fabricated by drop-coating with different drop-coating times on the surface of polyethylene terephthalate (PET) coupled with Au electrodes. By optimizing the cross-linked network of Ag NW@ZnO NRs, PD2 with a size greater than 25 mm exhibits excellent photoresponse under UV light illumination of 365 nm (1.3 mW cm - 2 ) with a bias of 5 V: a high sensitivity of over 10 3 , and a much shorter rise/decay time of 2.6 s/2.3 s. Simultaneously, the detector exhibits an average transmittance of more than 70% in the visible light region, as well as good flexibility and excellent mechanical stability under a bending angle of 120° over 1000 circles bending. These integral advantages have significant potential for practical applications and mass production.
研究领域:
材料科学
·
纳米科技
·
光电子学
·
柔性电子学
·
半导体器件
·
表面科学
·
薄膜技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2013
·Vol. 2
·期 11
·3776-3782
·
IF 0
Pinjie Zhang,Lianbang Wang,Jian Xie,Liwei Su,Chun-an Ma
The extremely large volume variation and poor electronic conductivity of Si anode materials for lithium ion batteries have seriously hampered their performances and practical applications. SiOx materials are regarded as ideal alternatives to high-capacity Si anode materials for Li-ion batteries, since the generated Li2O matrix from Li–SiOx reactions can effectively accommodate the large volume swing of Si. Furthermore, micron-sized particles with much smaller surface area always present higher initial coulombic efficiency and tap density than nanomaterials. Based on the above considerations, SiOx microparticles with homogeneously-embedded Si nanocrystals and nanopores were fabricated by magnesiothermic reduction in this work and were further modified by high-electronic-conductivity and flexible polyaniline (PANI)–Ag shell. Profiting from these favorable features, the obtained SiOx–PANI–Ag micron-composites exhibited better cycling performances (with a reversible capacity of 1149 mA h g−1 after 100 cycles), good initial coulombic efficiency and tap density in comparison with SiOx-based materials in other works. This study promotes us to exploit advanced Si- or Sn-based materials for Li ion batteries and preparing micro/nano complex structures for promising applications.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
功能材料
✓ 已验证
DOI
MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 8
·1-11
·
IF 5.7
Zhang Ziyi,Liu Dan,Zhang Xiaoshuo,Luo Xueli,Lin Wanmei,Li Zhonghong,Huang Jihong
Novel methods for high-performance detection of Hg 2+ in seafood are critical for ensuring food safety and human health. Herein, Ag nanoparticles (Ag NPs) were successfully deposited on carbon microspheres (CMs) to form Ag NPs-CMs nanocomplex. The proposed Ag NPs-CMs could oxidize colorless 3,3′,5,5′-tetramethylbenzidine (TMB) to blue oxidation state TMB (oxTMB) in the presence of hydrogen peroxide (H 2 O 2 ) and had a significant UV–vis absorption peak at 652 nm. The excellent peroxidase-like activity was attributed to the increased electrostatic attraction of CMs and the catalytic synergistic effect. After adding Hg 2+ , the catalytic activity of Ag NPs-CMs was specifically enhanced and the Michaelis–Menten constant ( K m ) decreased from 0.067 to 0.052 mmol/L due to the formation of Ag-Hg amalgam which produced more superoxide anions (O 2 •− ) and hydroxyl radicals (•OH). The linear response ranges for Hg 2+ were 2~833 nmol/L and 2.5~40 μmol/L, with the low detection limit of 1.10 nmol/L. This method was applied to detect Hg 2+ in seafood with satisfactory recoveries of 95.65~106.56%. A hydrogel kit was designed for portable detection of Hg 2+ , and the response range was 0.5~5 μmol/L. This work provides a reliable method for visual Hg 2+ detection in seafood as well as a feasible strategy for the design of high-performance nanozymes. Graphical
研究领域:
纳米技术
·
环境监测
·
食品安全
·
生物传感器
·
催化
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 107
·期 9
·6439-6455
·
IF 3.5
Liangliang Tang,Dongxu Yao,Yongfeng Xia,Jun Zhao,Ming Zhu,Yu-Ping Zeng
Complex liquid–solid reactions occur during brazing. A deep understanding of brazing liquid evolution is therefore of important concern for the bonding between filler and substrates. The joining of gas-pressure-sintered silicon nitride (Si 3 N 4 ) ceramic to oxygen-free copper (OFC) foil was prepared using Ag–Cu–TiH 2 filler at 875°C for 0.5 h. The effect of the Ag:Cu ratio on the interfacial microstructure and peeling strength of the joints was analyzed. The reaction of brazing liquid with Si 3 N 4 ceramic includes reactions with both the β-Si 3 N 4 and the grain boundary phases (Y–Si–Mg–O–N). The resulting interfacial reaction products include TiN, Ti 5 Si 3 , and potential Cu 3 Ti 3 O. Based on the phase composition and three-dimensional morphology of the interfacial reaction products in the Si 3 N 4 ceramic/OFC foil joints, a model for the evolution of the brazing liquid as the reaction proceeds was proposed. Peeling test results indicated that the peeling strength of the joints rises unilaterally with the increase of the Ag:Cu ratio in the filler until reaching the peak value of 24.3 N/mm at the maximum Ag:Cu ratio of 90:10. The mechanisms of the joint peeling fracture were discussed in detail.
研究领域:
材料科学
·
冶金学
·
陶瓷学
·
连接技术
·
表面工程
✓ 已验证
DOI
高影响因子
Royal Society Open Science
·
2019
·Vol. 6
·期 9
·
IF 2.515
Shang Wang,Zhaolian Han,Tingting Di,Rui Li,Siyuan Liu,Zhiqiang Cheng
The pod-shaped TiO2 nano burst tubes (TiO2 NBTs) were prepared by the combination of electrospinning and impregnation calcination with oxalic acid (H2C2O4), polystyrene (PS) and tetrabutyl titanate. The silver nanoparticles (AgNPs) were loaded onto the surface of TiO2 NBTs by ultraviolet light reduction method to prepare pod-shaped Ag@TiO2 NBTs. In this work, we analysed the effect of the amount of oxalic acid on the cracking degree of TiO2 NBTs; the effect of the concentration of AgNO3 solution on the particle size and loading of AgNPs on the surface of TiO2 NBTs. Scanning electron microscopy and transmission electron microscopy investigated the surface morphology of samples. X-ray diffraction and X-ray photoelectron spectroscopy characterized the structure and composition of samples. Rhodamine B (RhB) solution was used to evaluate the photocatalytic activity of pod-shaped TiO2 NBTs and Ag@TiO2 NBTs. The results showed that TiO2 NBTs degraded 91.0% of RhB under ultraviolet light, Ag@TiO2 NBTs degraded 95.5% under visible light for 75 and 60 min, respectively. The degradation process of both samples was consistent with the Langmuir–Hinshelwood first-order kinetic equation. Therefore, the catalytic performance of the sample is: Ag@TiO2 NBTs > TiO2 NBTs > TiO2 nanotubes.
研究领域:
材料科学
·
纳米技术
·
光催化
·
环境工程
✓ 已验证
DOI
高影响因子
ANALYST
·
2015
·Vol. 141
·期 9
·2712-2726
·
IF 4.107
Min Hong,Lidan Xu,Fangli Wang,Zhirong Geng,Haibo Li,Huaisheng Wang,Chen-zhong Li
Silver nanoparticles (AgNPs) and reduced graphene oxide (rGO) hybrid nanoporous structures fabricated by the layer-by-layer (LBL) electrostatic self-assembly have been applied as a simple platform for the rapid analysis of carboxyl-containing small molecules by surface-assisted laser desorption/ionization (D/I) mass spectrometry (SALDI-MS). By the simple one-step deposition of analytes onto the (AgNP/rGO)9 multilayer film, the MS measurements of various carboxyl-containing small molecules (including amino acids, fatty acids and organic dicarboxylic acids) can be done. In contrast to other energy transfer materials relative to AgNPs, the signal interferences of a Ag cluster (Agn+ or Agn−) and a C cluster (Cn+ or Cn−) have been effectively reduced or eliminated. The effects of various factors, such as the pore structure and composition of the substrates, on the efficiency of D/I have been investigated by comparing with the (AgNP)9 LBL nanoporous structure, (AgNP/rGO)9/(SiO2NP)6 LBL multilayer film and AgNP/prGO nanocomposites.
研究领域:
分析化学
·
纳米生物技术
·
质谱分析
·
分子诊断
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Nano
·
2020
·
IF 14.588
Xin Li,You Jun Fan,Hua Yang Li,Jin Wei Cao,Yu Chuan Xiao,Ying Wang,Fei Liang,Hai Lu Wang,Yang Jiang,Zhong Lin Wang,Guang Zhu
Skin sensors are of paramount importance for flexible wearable electronics, which are active in medical diagnosis and healthcare monitoring. Ultrahigh sensitivity, large measuring range, and high skin conformability are highly desirable for skin sensors. Here, an ultrathin flexible piezoresistive sensor with high sensitivity and wide detection range is reported based on hierarchical nanonetwork structured pressure-sensitive material and nanonetwork electrodes. The hierarchical nanonetwork material is composed of silver nanowires (Ag NWs), graphene (GR), and polyamide nanofibers (PANFs). Among them, Ag NWs are evenly interspersed in a PANFs network, forming conductive pathways. Also, GR acts as bridges of crossed Ag NWs. The hierarchical nanonetwork structure and GR bridges of the pressure-sensitive material enable the ultrahigh sensitivity for the pressure sensor. More specifically, the sensitivity of 134 kPa–1 (0–1.5 kPa) and the low detection of 3.7 Pa are achieved for the pressure sensor. Besides, the nanofibers act as a backbone, which provides effective protection for Ag NWs and GR as pressure is applied. Hence, the pressure sensor possesses an excellent durability (>8000 cycles) and wide detection range (>75 kPa). Additionally, ultrathin property (7 μm) and nanonetwork structure provide high skin conformability for the pressure sensor. These superior performances lay a foundation for the application of pressure sensors in physiological signal monitoring and pressure spatial distribution detection.
研究领域:
生物医学工程
·
柔性电子学
·
传感器技术
·
纳米材料
·
健康监测
·
转化医学
✓ 已验证
DOI
高影响因子
Nanoscale Research Letters
·
2015
·Vol. 10
·期 1
·1-6
·
IF 2.779
Wu Chunfang,Zhou Xue,Wei Jie
The surface plasmon resonance (SPR) of silver nanoparticles can be tuned throughout the visible and near-infrared region by their shape and size. Considering SPR applications, an easy and controllable method for preparing the silver nanocrystals with defined shape and size, is necessary. In this work, the triangular silver nanoplates were synthesized by reducing Ag + ions with ascorbic acid in the presence of silver seeds and poly(vinylpyrrolidone) (PVP) at room temperature. Both the seeds (as the nucleation sites) and PVP (as the capping reagent) played an important role in determining the edge length of the silver nanotriangles. The SPR of silver nanotriangles showed three distinct bands corresponding to the in-plane dipole, quadrupole, and out-plane quadrupole plasmon resonance, and the SPR shifted to shorter wavelengths with the decreased edge length of the silver nanotriangles as the theoretical calculation.
研究领域:
纳米医学
·
生物传感器
·
光学材料
·
分子影像
·
转化医学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2014
·
IF 6.007
Xu Yan,Xiyou Wang,Wei Gu,MiaoMiao Wu,Yan Yan,Bo Hu,Guangbo Che,Donglai Han,Jinghai Yang,Weiqiang Fan,Weidong Shi
Single-crystalline AgIn(MoO 4 ) 2 nanosheets have been successfully fabricated by facile hydrothermal method without any surfactants. Subsequently, Ag/AgBr-grafted AgIn(MoO 4 ) 2 nanosheets were synthesized by the in situ photoreduction of AgBr/AgIn(MoO 4 ) 2 composites prepared by a deposition–precipitation method. Under visible light irradiation. The Ag/AgBr/AgIn(MoO 4 ) 2 composites exhibit a strong absorbance in the visible region because of the surface plasmon resonance absorption of Ag nanocrystals. Compared with bare AgIn(MoO 4 ) 2 nanosheets, Ag/AgBr nanoparticles and Ag/AgIn(MoO 4 ) 2 composites, a dramatic enhancement in the degradation rate of tetracycline (TC) is observed over the Ag/AgBr/AgIn(MoO 4 ) 2 composites. The immense enhancement of the photocatalytic activity is attributed to the extended absorption in the visible-light region, effective charge separation, and synergistic enhancement induced by surface plasmon resonance (SPR) in the heterostructured Ag/AgBr/AgIn(MoO 4 ) 2 . This study provides new insight into the fabrication of highly efficient and stable ternary metal molybdate based plasmonic photocatalysts and facilitates their practical application to solve environmental issues. The mechanism for the photodegradation of TC over Ag/AgBr/AgIn(MoO 4 ) 2 is discussed in detail.
研究领域:
材料科学
·
环境化学
·
光催化
·
纳米材料
·
无机化学
·
物理化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 21
·12412-12422
·
IF 4.22
Qin Yipeng,Huang Yuhan,Li Min,Ren Bo,Wang Pan,Zhong Qidi,Liu Chunyan
Novel thermal nanoparticles [hollow mesoporous silica nanospheres (HMSNs)–poly ( N -isopropyl acrylamide-acrylic acid) PNIPAM-AA] were developed with Ag nanoparticles (AgNps) as the core, mesoporous silica nanoparticles as the layer, and thermally responsive polymers PNIPAM-AA as the shell. The AgNps had good photothermal effects, PNIPAM-AA was responsive to temperature, the combination of AgNps and PNIPAM-AA could be used as a photothermal-responsive switch for drug release, and HMSNs greatly increased the drug loading of the carrier. The samples were characterized by means of scanning electron microscopy, transmission electron microscopy, N 2 adsorption–desorption, thermogravimetric analysis, Fourier transform infrared spectroscopy, and UV–Vis absorption spectra. The results showed that Ag@HMSN nanoparticles possessed a uniform diameter (330 nm), high specific surface area (822.45 m 2 /g), and mesoporous pore size (2.75 nm). Using ibuprofen (IBU) as a model drug, the release process was monitored under in vitro conditions to investigate its release characteristics at different temperatures. The results showed that the nanoparticles had a significant regulatory effect on IBU release. Graphical abstract
研究领域:
纳米医学
·
药物递送
·
生物材料
·
肿瘤治疗
·
分子影像
✓ 已验证
DOI
高影响因子
Science Bulletin
·
2019
·
IF 6.277
Teng Li,Shengyou Li,Xuyi Li,Zijie Xu,Jizhong Zhao,Yating Shi,Yanan Wang,Rui Yu,Xiangyang Liu,Qingchi Xu,Wenxi Guo
As essential components of numerous flexible and wearable optoelectronic devices, the flexible transparent conducting electrodes (TCEs) with sufficient optical transmittance and electric conductivity become more and more important. In this work, we fabricated a large-area flexible TCE based on leaf vein-like hierarchical metal grids (HMG) comprising of mesoscale “trunk” and microscale “branches”. The self-formed branched grids made the conducting paths distributing uniformly while the laser-etching trunk grids enabled to transport the collected electrons across long-distance. The Ag HMG exhibited high optical transmittance (~81%) with low sheet resistance (1.36 Ω sq –1 ), which could be simply optimized through adjusting the grids’ widths, spaces, and the sizes of the TiO 2 colloidal crackle patterns. In addition, on the basis of such advanced HMG electrode, flexible electrochromic devices (ECDs) with remarkable cyclic performance were fabricated. The HMG with high transparency, conductivity, and flexibility provides a promising TCE for the next-generation flexible and wearable optoelectronic devices.
研究领域:
材料科学
·
纳米科技
·
柔性电子学
·
光电子学
·
表面工程
·
功能材料
·
智能窗口技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）