Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2025
·
IF 4.6
A.V. Parfeneva,V.P. Ulin,E.K. Khrapova,M.V. Tomkovich,G.V. Li,A.M. Rumyantsev,D.A. Kirilenko,E.V. Beregulin,A.A. Krasilin,E.V. Astrova
A method for accelerated synthesis of 2D MXenes Ti 3 C 2 T x from the MAX phase Ti 3 AlC 2 by selective etching of Al in acidic fluoride-contained solutions in the presence of HAuCl 4 as a catalyst is proposed. The results of characterization of the etching products using scanning and transmission electron microscopy, X-ray diffraction analysis, energy-dispersive X-ray spectroscopy and 4-probe resistivity measurements are presented. It is shown that the introduction of HAuCl 4 into the etching solution increases the rate of aluminum removal from the precursor crystals and increases the efficiency of their separation into 2D layers. The mechanism of such acceleration is a transfer of the hydrogen gas release region from the distributed front of aluminum dissolution inside the crystal to the clusters of gold formed on its outer surfaces.
研究领域:
材料科学
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纳米科技
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无机化学
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凝聚态物理
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产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2016
·Vol. 18
·期 13
·8993-9004
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IF 4.449
Guanghua Fan,Yanhua Han,Suilian Luo,Yutong Li,Shiliang Qu,Qiang Wang,Renxi Gao,Minrui Chen,Min Han
Both fabrication of Au nano-objects and the nonlinear optical properties of Au nano-objects are the focus of research. In the present work, Au nanoparticles with different mean sizes (18, 32, 42, and 70 nm) are controllably fabricated in ethanol by changing the concentration of poly(vinylpyrrolidone) (PVP) and HAuCl4, as well as the power of continuous wave UV light at 365 nm. PVP acts as both reducing and protective agent. The mechanism of photoreduction of PVP to HAuCl4 is proposed. PVP undergoes a series of chemical reactions which include the attack of the hydrogen atom on the tertiary carbon atom at the α-position of the nitrogen atom, production of a hydroxyl radical, and chain scission. The hydroxyl radical combines with the hydrogen atom produced through the dissociation of HAuCl4, which facilitates the decomposition of HAuCl4. The fabrication mechanism of Au nanoparticles is discussed. The nonlinear absorption of these Au nanoparticles is investigated; all of them exhibit saturable absorption, and the saturable absorption dominates the nonlinear absorption with the increase of laser energy. The dominance of saturable absorption in the nonlinear absorption is due to the stronger single-photon absorbed intraband absorption from the ground state to the first excited state in the conduction band, the weaker excited state absorption in the conduction band, and the weaker two-photon absorption from the d band to the conduction band.
研究领域:
材料科学
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光学
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化学
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产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
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2021
·Vol. 188
·期 4
·1-9
·
IF 5.833
Li Li,Li Siqun,Yu Xinjie,Chen Zhengbo
A colorimetric sensing method is described for discrimination of multiple antioxidants based on core-shell Au@Ag nanocubes (NCs). In order to extract data-rich colorimetric responses from the sensor array, three different concentrations of chloroaurate acid (HAuCl 4 ) were employed as sensing elements. Interestingly, Au 3+ ions can be reduced to different valence states (i.e., Au(0) and Au(I)) by different antioxidants, and thus effectively inhibit the oxidation etching process of Au@Ag NCs by Au(III) ions to varying extents, generating diverse colorimetric responses (color and absorbance). This enables identification of the six antioxidants at 10 nM via linear discriminant analysis (LDA) with relative standard deviation (RSD) of 2.52% ( n = 3). The discrimination ability of the sensor array was further evaluated in antioxidant binary and multicomponent mixtures. Remarkably, identification of these six antioxidants spiked in urine was realized with 100% of accuracy. Graphical abstract
Schematic presentation of colorimetric assay for antioxidants based on three chloroauric acid/Au-Ag nanocubes.
研究领域:
分析化学
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纳米技术
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生物医学工程
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DOI
PubMed
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 19
·3294
·
IF 5.719
Beenish Mustafa,Wengang Lu,Zhiyuan Wang,Fuzhuo Lian,Andy Shen,Bing Yang,Jun Yuan,Chang Wu,Yangbowen Liu,Weiwei Hu,Lei Wang,Geliang Yu
Here, rational design electrodes are fabricated by mixing MXene with an aqueous solution of chloroauric acid (HAuCl4). In order to prevent MXene from self-restacking, the groups of -OH on the surface of Ti3C2Txnanosheets underwent a one-step simultaneous self-reduction from AuCl4-, generating spaces for rapid ion transit. Additionally, by using this procedure, MXene’s surface oxidation can be decreased while preserving its physio-chemical properties. The interlayered MX/Au NPs that have been obtained are combined into a conducting network structure that offers more active electrochemical sites and improved mass transfer at the electrode–electrolyte interface, both of which promote quick electron transfer during electrochemical reactions and excellent structural durability. The Ti3C2Tx-AuNPs film thus demonstrated a rate performance that was preferable to that of pure Ti3C2Txfilm. According to the results of the characterization, the AuNPs effectively adorn the MXene nanosheets. Due to the renowned pseudocapacitance charge storage mechanism, MXene-based electrode materials also work well as supercapacitors in sulfuric acid, which is why MXene AuNPs electrodes have been tested in 3 M and 1 M H2SO4. The symmetric supercapacitors made of MXene and AuNPs have shown exceptional specific capacitance of 696.67 Fg−1at 5 mVs−1in 3 M H2SO4electrolyte, and they can sustain 90% of their original capacitance for 5000 cycles. The highest energy and power density of this device, which operates within a 1.2 V potential window, are 138.4 Wh kg−1and 2076 W kg−1, respectively. These findings offer a productive method for creating high-performance metal oxide-based symmetric capacitors and a straightforward, workable approach for improving MXene-based electrode designs, which can be applied to other electro-chemical systems that are ion transport-restricted, such as metal ion batteries and catalysis.Keywords:symmetric supercapacitors;MXene;chloroauric acid (HauCl4);energy density;power density;aqueous electrolyte;energy storage;2D materials
研究领域:
材料科学
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电化学
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储能技术
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DOI
PubMed
高影响因子
Small
·
2019
·Vol. 15
·期 14
·1900050
·
IF 10.856
Ting Su,Zhong Lin Wang,Zhiwei Wang
It is demonstrated that the redox reaction behaviors of Pd nanoparticles in HAuCl 4 solutions can be substantially modified by the introduction of hexadecyl trimethyl ammonium bromide (CTAB) agents through systematic liquid cell transmission electron microscopy (LCTEM) investigations. The gradual dissolution of Pd nanoparticles is observed when HAuCl 4 solution is pumped into liquid flow cells, the etching characteristics of which are depended on both HAuCl 4 concentrations and incident electron doses. In comparison, with the presence of CTAB agents, the dominated phenomenon appears to be the precipitation of Au species and incorporation onto the surface of Pd seeds. It is also observed that the rapid growth of Au on Pd seeds occurs by loading Pd and HAuCl 4 solutions into static liquid cells. The resultant Au shells exhibit rather sparse structural configurations and are formed possibly by homogeneous nucleation/coalescence of Au species as well as monomer attachments. The observed Au-shell growth instead of Pd dissolution is attributed to the presence of the residual regents, which may be also responsible for the initially already existing small Au adsorptions at the corner/edge sites of Pd seeds. The study provides a useful reference for the convenient fabrication of complex nanostructures and functional nanomaterials in a controllable way.
研究领域:
纳米技术
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材料科学
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化学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Jiuhong Yi,Zexiang Wang,Jing Hu,Ting Yu,Yidan Wang,Pengfei Ge,Yunlei Xianyu
Antioxidants are crucial for human health, and the detection of antioxidants can provide valuable information for disease diagnosis and health management. In this work, we report a plasmonic sensing approach for the determination of antioxidants based on their antietching capacity toward plasmonic nanoparticles. The Ag shell of core–shell Au@Ag nanostars can be etched by chloroauric acid (HAuCl4), whereas antioxidants can interact with HAuCl4, which prevents the surface etching of Au@Ag nanostars. We modulate the thickness of the Ag shell and morphology of the nanostructures, showing that the core–shell nanostars with the smallest thickness of Ag shell have the best etching sensitivity. Owing to the extraordinary surface plasmon resonance (SPR) property of Au@Ag nanostars, the antietching effect of antioxidants can induce a significant change in both the SPR spectrum and the color of solution, facilitating both the quantitative detection and naked-eye readout. This antietching strategy enables the determination of antioxidants such as cystine and gallic acid with a linear range of 0.1–10 μM. The core–shell Au@Ag nanostars are further immobilized in agarose gels to fabricate test strips, which can display different color changes in the presence of HAuCl4 from 0 to 1000 μM. The agarose-based test strip is also capable of detecting antioxidants in real samples, which allows naked-eye readout and quantitative detection by a smartphone.
研究领域:
纳米技术
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分析化学
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生物医学工程
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材料科学
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产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2025
·
IF 7.7
Zhuanghu Xu,Guohong Liu,Lianbo Jiang,Jian Li,Weihui Wu,Yanhua Xiao,Yongling Shen,Danping Li,Yuru Xu
Mustard gas is favored by terrorists due to its simple production process, ease of deployment, low cost, and severe destructive effects on human health. In terrorist attacks, the use of mustard gas can cause large casualties and seriously threaten public safety. In recent years, colorimetric detection technology has its unique advantages in the detection of toxic and harmful substances. Herein, gold nanoparticles (AuNPs) with 4 distinct nano-sizes are synthesized using gold (Ⅲ) chloride hydrate (HAuCl 4 ·xH 2 O) as the raw material, and either ascorbic acid or sodium citrate as the reducing agent, thereby constructing a 4 × 4 colorimetric sensor array. The preparation process is simple, the size of the nanoparticles is controllable, and the response to mustard gas is sensitive. The experimental results show that the detection linear range of the colorimetric sensor array is 5–100 mg·L −1 , and the limit of detection (LOD) is 4.13 mg·L −1 . Meanwhile, mustard gas in real samples are tested. The sample recovery rates are between 91.42 % and 122.1 %, and the relative standard deviation values (RSD) are between 0.21 % and 6.37 %. It suggests that the proposed colorimetric sensor array has a potential application on the detection of mustard gas in real samples.
研究领域:
分析化学
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纳米技术
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化学传感
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安全与防御
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环境监测
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产品关联
DOI
高影响因子
Analytical Methods
·
2016
·Vol. 8
·期 35
·6560-6565
·
IF 1.915
Changqing Zhu,Ying Hong,Zhen Xiao,Yang Zhou,Yuan Jiang,Ming Huang,Xinglian Xu,Guanghong Zhou
A sensitive method for the colorimetric determination of Salmonella typhimurium (S. typhimurium) was developed based on aptamer recognition and gold nanoparticles. First, a biotinylated specific aptamer for S. typhimurium was immobilized on avidin-coated microplate wells. Then, target bacteria, a biotinylated aptamer and avidin-catalase were successively introduced into the microplate wells. Finally, hydrogen peroxide and freshly prepared gold(III) chloride trihydrate were added, and the absorbance of the reaction product was measured with a plate reader. Under optimized conditions, there was a linear relationship between the absorbance (A550 nm) and the concentration of S. typhimurium over the range of 101 to 106 cfu mL−1 (R2 = 0.9920), with a detection limit of 10 cfu mL−1. This simple rapid method provided a promising tool for on-site screening of S. typhimurium in raw chicken samples.
研究领域:
微生物学
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分析化学
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食品安全
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产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 13
·3046
·
IF 4.2
Jingyi Zhang,Congmei Lin,Feng Li,Xinhao Wei,Yusen Chen,Yanyong Fu,Xiaoping Yu,Biao Zhang,Zihong Ye
Cancer is one of the major public health challenges in the world, which is characterized by rapid progression and high mortality. Immunotherapy, represented by PD-1 monoclonal antibody, has significantly improved the efficacy of malignant tumors and has become one of the most popular immunotherapy methods at present. Therefore, there is an increasing demand for novel detection methods for PD-1 monoclonal antibodies. The aim of this work was to establish a rapid, simple, and sensitive immunochromatographic test strip (ICTS) based on the AuNPs enlargement for both visual and instrumental detection of the PD-1 monoclonal antibody concentration. The mixed solution of NH2OH·HCl and HAuCl4was used as an enhancement solution to lower the detection limit and achieve higher sensitivity. A test strip reader was used to construct a visualized quantitative detection standard curve for the PD-1 monoclonal antibody concentration. The LOD was 1.58 ng/mL through a triple signal-to-noise ratio. The detection time was within 10 min. The constructed test strips can rapidly, accurately, and efficiently detect the concentration of PD-1 monoclonal antibody in real samples.
研究领域:
医学生物技术
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免疫学
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癌症研究
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纳米技术
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Zeyu Qin,Wangyang Fang,Qinbo Jiang,Jiawen Li,Hui Zhang
Inspired by the natural antimicrobial effect of the topographical features of insect wings, this study prepared urchin-like gold nanoparticles (UGNPs) and deposited them on poly(ε-caprolactone) (PCL)/chitosan (P/C) electrospun nanofiber film to strengthen antibacterial activities of this active packaging. Results showed that L-Dopa was a suitable reducing agent to prepare UGNPs, and the spine length of UGNPs increased from 21.23 to 35.83 nm as the molar ratio of L-Dopa:HAuCl 4 increased from 1 to 3. As the nanofiber film was immersed in the nanoparticle solution for a longer time, the UGNP content in P/C nanofibers increased. As the spine length of UGNPs and depositing UGNP content increased, the inhibition rate against S. aureus and E. coli . of P/C nanofiber film increased. In addition, P/C nanofiber film deposited with UGNPs also exhibited good thermal stability , hydrophilicity, mechanical strength , and water vapor permeability, exhibiting its potential as an antibacterial active packaging.
研究领域:
材料科学
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纳米技术
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包装工程
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2018
·
IF 8.173
Hongying Cheng,Cuiying Hu,Zhongling Ji,Wangcheng Ma,Hongxia Wang
Herein, a doped graphene-like membrane was designed, which was copolymerized to be a solid ionic biosensor by using titania nanotubes (TiNTs), polyaniline (PANI), EvimCl (1-ethyl-3-vinylimidazolium chloride, EVIMC) and chloroauric acid (HAuCl 4 ). The structure of graphene-like arrangement and the copolymerization mechanism of the film were discussed in detail. Because of the high catalytic property , Lactate could be determined on the membrane catalyzed by lactate dehydrogenase (LDH) containing isocitrate dehydrogenase (NAD + ), which was immobilized onto the film by electrostatic attraction . The electrochemical response on the LDH/Au-EVIMC-TiNTs-PANI/ITO was increased by twice than the LDH/TiNTs/PANI/ITO, and exhibited two linear responses within the concentration range from 5.5 × 10 −7 M to 5.55 × 10 −6 M, and 5.55 × 10 −6 M to 3.33 × 10 −3 M, with a detection limit of 1.65 × 10 −7 M ( S / N = 3). The interference study for other common coexistence such as uric acid and hemoglobin revealed that there was no overlapping signal for the detection of Lactate on the biosensor. The developed method proved the most stability in the determination of real blood samples, and the recoveries ranged from 96.7% to 105.8% with a satisfactory result.
研究领域:
生物传感器
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材料科学
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分析化学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Xing Xing,Yao Zhou,Yelu Wei,Yuchen Zhang,Zaiqin Man,Weihua Zhang,Zhenda Lu
Precise patterning of molecules/ions in the nanometer scale is a crucial but challenging technique for the fabrication of advanced functional nanodevices. We developed a robust method to print molecules/ions into arbitrarily defined patterns with sub-20 nm precision assisted by reverse micelles. The reverse micelle, serving as a nano-sized vessel, can load molecules/ions and then be patterned onto the predefined positions by electrostatic attraction. The number of molecules/ions on each spot, the spot spacing, and pattern shapes can be flexibly adjusted, reaching 10 nm position accuracy, 30 nm spot size, and 100 nm spot spacing (>250,000 DPI). Then, water-soluble dye molecules, protein molecules, and chloroaurate ions were loaded in the micelles and successfully patterned into nanoarrays, which provides an important platform for the convenient, flexible, and robust fabrication of functional molecule/ion-based nanodevices, such as biochips, for high-throughput and ultrasensitive analysis.
研究领域:
纳米技术
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材料科学
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生物技术
·
分析化学
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产品关联
DOI
PubMed
高影响因子
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