EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2021
·Vol. 2021
·期 12
·1152-1159
·
IF 2.524
Quansen Wu,Gongguo Zhang,Yanyun Ma,Mengfan Li,Feng Liu,Hongwen Huang,Maochang Liu,Yiqun Zheng
Graphical Wavy gold-silver alloy nanowires with tunable diameters in the range of 2–10 nm are prepared via an ultrafast seed-mediated co-reduction. Their UV-vis extinction spectra show a broad absorbance band in the range of 450–550 nm. We report an ultrafast synthesis of wavy gold-silver (AuAg) nanowires with tunable diameters via a seed-mediated co-reduction. The success of current strategy relies on the use of an elevated reaction temperature to accelerate the synthesis to be completed within several minutes and the use of Au seeds with controlled sizes to enable the manipulation over their diameters in the range of 2–10 nm. The presence of chloride-contained quaternary ammonium surfactant and excessive reductant have been demonstrated to be critical for the high-yield formation of AuAg products with the unique morphology of wavy nanowire. Due to the advantage in size control, the size effect on the plasmonic behavior of AuAg alloy wavy nanowires is investigated, where the products with sub-5 nm diameter exhibit a broad shoulder absorbance peak in their spectrum.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2020
·Vol. 2021
·期 2
·156-165
·
IF 2.529
Gongguo Zhang,Yanyun Ma,Feng Liu,Xiaowei Fu,Xiaoqian Luan,Fengli Qu,Maochang Liu,Yiqun Zheng
Graphical Gold@palladium-silver alloy core-shell dendritic nanocrystals with tunable size and elemental composition were fabricated in high purity via seeded growth. Compared to commercial Pd/C catalysts, the current products exhibit enhanced activity and excellent operation stability for electroxidation of ethanol in alkaline media. We report a facile synthesis of Au@PdAg alloy core-shell nanocrystals in dendrite form, having tunable size and composition. In particular, using spherical Au nanoparticles as seeds, the co-reduction of Pd and Ag precursor in growth stage results in the formation of PdAg alloy shells with a dendrite shape. Their size and elemental composition can be tuned by varying the seed amount and feeding ratio in Pd and Ag precursor, respectively, illustrating the versatility of the current synthetic strategy. The size, morphology, and elemental composition of the products have been characterized using a set of techniques, including SEM, TEM, XRD, XPS, HAADF-STEM, and EDX-STEM mapping. When working as electrocatalysts, the current Au@PdAg alloy core-shell nanocrystals supported by carbon black exhibit enhanced activity and excellent operation stability for electroxidation of ethanol as compared to commercial Pd/C. The current work offers a feasible strategy to preparation of multi-metallic core-shell dendritic nanocrystals with controllable size and composition and could find important use in fuel cells and related fields.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
TALANTA
·
2024
·
IF 5.6
Yanli Zhou,Hewen Yin,Junru Li,Kexian Shao,Hui Dong,Cuixia Ling,Xiaobing Wang,Maotian Xu
A nitrogen-doped carbon shell loaded with a gold and silver alloy (Au/Ag@NCS) was constructed for highly sensitive electrochemical detection of NO . The Au/Ag@NCS material was prepared by use of SiO 2 particles as a template to polymerize imidazolium-based ionic liquids loaded with gold and silver salts, and subsequent carbonization treatment and template removal. The hollow structure of the carbon material acted as a carrier for electrochemical sensing, offering high specific surface area , large pore capacity, robust electron conductivity, and excellent mechanical stability. The inclusion of gold in the composite enhanced its catalytic and sensing capabilities, while silver oxidation was employed as a reference signal for accurate detection. By utilization of the Au/Ag@NCS-modified electrode, a wide detection range from 0.5 nM to 1.05 μM with a low detection limit of 0.32 nM was achieved for NO detection. The electrochemical sensor also exhibited high selectivity and excellent stability. The fabricated sensor was further utilized to explore the release of NO from breast cancer cells, revealing that the electrochemical platform could be regarded as an important method to study the daily tests of NO in clinical application.
研究领域:
材料科学
·
生物医学工程
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL PHYSICS
·
2021
·Vol. 155
·期 7
·
IF 3.488
Lin Xinzhang,Tang Jie,Zhang Jubo,Yang Yang,Ren Xiuqing,Liu Chao,Huang Jiahui
Alloy nanoclusters protected by ligands were widely studied due to the synergistic effect of metal atoms, and they exhibit enhanced properties in different fields, such as bio-imaging and catalysis. Herein, we obtained Au 8 Ag 17 (PPh 3 ) 10 Cl 10 nanoclusters via one-step simple synthesis. The atomically precise crystal structure was determined by x-ray crystallography. It is found that the rod-like Au 8 Ag 17 nanoclusters were composed of two Au 4 Ag 9 icosahedrons via sharing the same Ag atom. Two Au atoms occupy the center of icosahedrons, and the other six Au atoms are all at the neck sites. Four kinds of Cl–Ag connecting modes were observed in Au 8 Ag 17 nanoclusters. Moreover, the ultraviolet–visible absorption spectrum shows that the prominent absorption peaks of Au 8 Ag 17 nanoclusters are at ∼395 and 483 nm. This work provides a feasible strategy to synthesize alloy nanoclusters with precise composition via doping engineering.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2018
·
IF 2.88
Ting Feng,Yu Chen,Bingbing Feng,Jilin Yan,Junwei Di
In this work, gold-silver alloy nanoclusters (AuAg NCs) were demonstrated as a novel probe for fluorescent detection of cysteine (Cys). The alloy nanoclusters were fabricated by bovine serum albumin as a template and NaBH 4 as a reducer. They showed a red emission at 650 nm. The interaction between AuAg NCs and Cys was investigated. The thiol group in Cys molecules has strong affinity on the surface of metals, which results in variation of fluorescence peak wavelength. It was further demonstrated that this red-shift of fluorescence had a good linear relationship with the concentration of Cys in the range of 2–100 μM. The method was successfully applied for human plasma analysis with satisfactory results. This novel strategy was expected to provide a potential opportunity for extending the application of novel metal nanoclusters in fluorescence.
研究领域:
分析化学
·
生物医学工程
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2017
·Vol. 7
·期 9
·255
·
IF 3.553
Keke Yu,Xiaonan Sun,Liang Pan,Ting Liu,Anping Liu,Guo Chen,Yingzhou Huang
Hollow noble metal nanoparticles have excellent performance not only in surface catalysis but also in optics. In this work, the hollow Au–Ag alloy nanorices are fabricated by the galvanic replacement reaction. The dark-field spectrum points out that there is a big difference in the optical properties between the pure Ag nanorices and the hollow alloy nanorices that exhibit highly tunable localized surface plasmon resonances (LSPR) and that possess larger radiative damping, which is also indicated by the finite element method. Furthermore, the surface enhanced Raman scattering (SERS) and oxidation test indicate that hollow Au–Ag alloy nanorices show good anti-oxidation and have broad application prospects in surface-plasmon-related fields.Keywords:hollow nanorice;Au–Ag alloy;surface plasmon;surface enhanced Raman spectroscopy
研究领域:
纳米材料科学
·
光学
✓ 已验证
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2020
·Vol. 50
·期 2
·562-567
·
IF 4.174
Lubing Qin,Feng Zhang,Xiaoshuang Ma,Yun Tang,Guanyu Ma,Zhenghua Tang
To advance the development of atomically precise Ag and Ag-alloyed nanoclusters, it is critical to develop effective synthetic methods. Herein, we successfully extend the CTAB (cetyl trimethyl ammonium bromide) reverse micelle method to synthesize a high-purity Ag44(p-MBA)30 (p-MBA = para-mercaptobenzoic acid) nanocluster and its corresponding alloy cluster Au12Ag32(p-MBA)30 in a short time (15 min and 5 min), with a high yield of ∼83% and ∼85%, respectively. Furthermore, the mechanism regarding the reverse micelle method has been clearly elucidated. Through characterizing the reaction system by Raman spectroscopy and NMR spectroscopy techniques, it can be revealed that employing CTAB to form reverse micelles to construct a sealed chemical environment is critical for realizing the fast and high-yield synthesis.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2019
·Vol. 31
·期 9
·095406
·
IF 3.399
Weisheng Lei,Fengzhi Wang,Xinhua Pan,Bin Lu,Zhizhen Ye
Plasmonic noble metal has been applied in photocatalytic materials, and TiO2 with plasmonic noble metal has been studied for a long time. In this work, we have fabricated incomplete covered Au/Ag alloy nanoshuttle-TiO2 nanomaterials with 268.7 μmol g−1 h−1 H2-evolution in a simple solution method. The considerable photocatalytic performance is mainly due to the enhanced surface plasmon resonance effect of Au/Ag alloy nanoshuttles. It has been found that TiO2 clusters attached to the Au/Ag nanoshuttles surface migrate under electrons irradiation and cover the exposed Au/Ag NS surface to achieve thermodynamic stability, which results in instability of photocatalytic performance. The mechanism has been discussed in detail.
研究领域:
材料科学
·
纳米技术
·
能源科学
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2024
·
IF 4.2
Wuzhi Zhu,Jiaming Hu,Xiaohui Tan,Fangfang Wu,Xuyuan Chen,Xiuxun Han
Large open-circuit voltage deficit is still the main factor restricting the performance of kesterite Cu 2 ZnSn(S,Se) 4 thin film solar cells. The high concentration of Cu Zn defects and [2Cu Zn + Sn Zn ] defect clusters are believed to be the significant origins of severe band tailing of the kesterite absorber. A promising way to improve the open-circuit voltage and power conversion efficiency of the device is substituting Ag + with a larger ionic radius for Cu + to suppress the defects and construct a front-graded bandgap. However, the Ag doping in kesterite can significantly lower the melting temperature, which results in difficulties in forming an Ag grading distribution across the absorber due to the strong thermal diffusion . Herein, we innovatively introduce a ZnO insert layer in the precursor film, which is expected to slow down the Ag-Cu interdiffusion during the selenization, thereby forming a desired front-graded bandgap. The Ag grading distribution in absorbers is regulated by the thickness of ZnO insert layer. The effects of ZnO insert layer on the phase compositions, morphologies, optical properties , and photovoltaic performance of Ag-doped kesterite absorbers are investigated.
研究领域:
材料科学
·
光伏技术
✓ 已验证
DOI
高影响因子
Nanoscale Research Letters
·
2012
·Vol. 7
·期 1
·1-6
·
IF 2.726
Sun Li,Luan Weiling,Shan Yue Jin
A capillary micro-reaction was established for the synthesis of Au-Ag alloy nanoparticles (NPs) with a flexible and controllable composition and grain size by tuning the synthesis temperature, the residence time, or the mole ratio of Au 3+ :Ag + . By extending the residence time from 5 to 900 s, enhancing the temperature from 120°C to 160°C, or decreasing the mole ratio of Au 3+ :Ag + from 1:1 to 1:20, the composition of samples was changed continuously from Au-rich to Ag-rich. The particles became large with the increase of the residence time; however, synthesis temperatures showed less effect on the particle size change. The particle size of the Au-Ag alloy NPs with various composition could be kept by adjusting the mole ratio of Au 3+ :Ag + . TEM observation displayed that the as-obtained NPs were sphere-like with the smallest average size of 4.0 nm, which is half of those obtained by the traditional flask method.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 13
·135501
·
IF 3.953
Jun Dong,Yan Wang,Qianying Wang,Yi Cao,Qingyan Han,Wei Gao,Yongkai Wang,Jianxia Qi,Mengtao Sun
Surface-enhanced Raman scattering (SERS) is recognized as one of the most favored techniques for enhancing Raman signals. The morphology of the SERS substrate profoundly affects molecular Raman spectra. This study aimed to construct a ring-mounted nanostructured substrate via liquid–liquid two-phase self-assembly incorporated with anodic aluminum oxide (AAO) membrane transfer techniques. High-density nanoparticles (NPs) assembled on AAO membranes were ascribed to reduce the diameters of the nanopores, with Au–Ag alloy NPs to regulate the dielectric constant so as to reveal the local surface plasmon resonance tunability. SERS engineered in this way allowed for the fabrication of a ring-mounted nanostructured substrate where the distribution density of NPs and dielectric constant could be independently fine-tuned. High SERS activity of the substrate was revealed by detecting the enhanced factor of crystal violet and rhodamine 6G molecules, which was up to 1.56 × 106. Moreover, SERS of thiram target molecules confirmed the supersensitivity and repeatability of the substrate as a practical application. The results of this study manifested a low-cost but high-efficiency ring-mounted nanostructured SERS substrate that might be suitable in many fields, including biosensing, medical research, environmental monitoring, and optoelectronics.
研究领域:
材料科学
·
光学
·
生物传感
·
环境监测
✓ 已验证
DOI
高影响因子
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
危险品化学品经营许可证（带存储）