JOURNAL OF ELECTRONIC MATERIALS
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2024
·Vol. 53
·期 7
·4250-4260
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IF 2.2
Zhao Yuan,Jiang Kanrui,Wang Wei,Chen Wenjing,Liu Qiutan,Zhi Guowei
Metal oxide semiconductors have been proven to be a very effective photocatalytic material. In this study, Au-WO 3 was successfully synthesized through a microwave irradiation-assisted one-pot method. The results demonstrated that the hydration degree of WO 3 · n H 2 O could be controlled by Au, and the nanorods could be refined. When the optimum Au modification level was 5.4 wt.%, the specific surface area of WO 3 · n H 2 O increased from 36.67 m 2 g −1 to 71.72 m 2 g −1 , indicating that active sites on the catalyst surface were added. The photocatalytic degradation of rhodamine B (RhB) is considered to assess the photocatalytic performance of the Au-WO 3 nanoparticles under visible light. The deterioration of the sample increased initially, then decreased as the Au level increased. The photocatalytic degradation capacity was strongest when the Au content was 5.4 wt.%, and the degradation rate was 0.0084 min −1 .
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Catalysts
·
2022
·Vol. 12
·期 1
·104
·
IF 4.501
Ying Duan,Qianqian Luo,Renfeng Nie,Jianshe Wang,Yongsheng Zhang,Tianliang Lu,Chunbao Xu
The production of methyl lactate as a degradable polymer monomer from biomass was an important topic for a sustainable society. In this manuscript, glycerol was oxidated to methyl lactate catalyzed by the combination of Au-CuO and Sn-Beta. The influence of Sn content, Sn source, and the preparation conditions for Sn-β was studied. The Au content in Au/CuO was also investigated by varying the Au content in Au/CuO. The catalysts were characterized by XRD, FTIR spectroscopy of pyridine adsorption, and TEM to study the role of Sn and the influence of different parameters for catalyst preparation. After the optimization of reaction parameters, the yield of methyl lactate from glycerol reached 59% at 363 K after reacting in 1.6 MPa of O2for 6 h.Keywords:glycerol;oxidation;methyl lactate;Sn-Beta;Au/CuO
研究领域:
催化化学
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生物质转化
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可持续化学
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DOI
高影响因子
Nanoscale
·
2024
·Vol. 16
·期 29
·13938-13944
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IF 5.8
Dan Xie,Youyou Deng,Xunlong Ji,Yiyan Zhang,Wentao Zhang,Zijin Hong,Wenjing Liu,Jingjing Du,Zhenli Sun
A novel breakthrough has been achieved in gas detection through the innovative application of surface-enhanced Raman scattering (SERS) to hydrogen (H2) detection for the first time. This study capitalizes on the unique SERS effects of gold nanoparticles coupled with the redox interaction between hydrogen and crystal violet, allowing for the development of a magnetic SERS probe that demonstrated enhanced sensitivity and specificity. This new probe can detect hydrogen concentrations as low as 1% by volume in gaseous environments, offering a substantial improvement over the detection limits of traditional hydrogen alarms. Further, this report comprehensively detailed the synthesis of the FA-CV materials, instrumental analysis, and an in-depth evaluation of the SERS performance of the FA-CV substrate, underlining the outstanding sensitivity, stability, and recyclability of the probe. The introduction of SERS in this novel capacity not only contributes a valuable approach to gas sensing technologies, but also suggests promising avenues for the application of SERS in environmental monitoring and energy security. This illustrates the adaptability and potential impact of this powerful technique.
研究领域:
化学
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材料科学
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环境科学
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DOI
PubMed
高影响因子
ANALYTICAL LETTERS
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2014
·
IF 1.019
Zhong-Xia Wang,Shou-Nian Ding,Ezzaldeen Younes Jomma Narjh
A simple and label-free fluorescent assay for the sensitive determination of biological thiols was developed using Au@Ag nanoclusters. The sensing approach was based on the strong affinity of thiols to silver on the surface of the nanoclusters. In the presence of thiol-containing amino acids, the fluorescence of the Au@Ag nanoclusters was quenched due to the formation of a non-fluorescent coordination complex via the robust Ag-S bond, which allowed the determination of thiol-containing amino acids in a very simple and rapid way. Under the optimal conditions, an excellent linear relationship was present due to quenching of the Au@Ag nanoclusters over cysteine concentrations between 20 nM and 80 µM with a low detection limit of 5.87 nM. Glutathione was determined between 2 µM and 70 µM with a detection limit of 1.01 µM. In addition, the results reveal that the fluorescent assay has excellent selectivity toward thiol-containing amino acids compared to non-thiol containing amino acids. Moreover, the assay was successfully used to determine cysteine in human plasma, and thus Au@Ag nanoclusters are a suitable fluorescent probe for biological applications.
研究领域:
分析化学
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生物医学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Haiyan Kang,Yulong Luo,Chaopeng Liu,Zhongxian Song,Chaohai Wang,Xu Yan,Mengxia Ma,Xiaole Yan,Deming Gu,Yanli Mao
The recovery of Au(III) by adsorption has attracted extensive attention since it promotes solving the problems of environmental pollution and resource waste. Herein, we prepared the functionalized MCM-41 (MCM-NH 2 -OH) and explored the synergistic adsorption effects for Au(III). The adsorption capacity of MCM-NH 2 -OH reached 1664.9 mg·g −1 , which was 15.98 times and 2.99 times higher than MCM-NH 2 (104.2 mg·g −1 ) and MCM-OH (556.0 mg·g −1 ), respectively. The fitting kinetics experiments demonstrated that Au(III) adsorption by MCM-NH 2 -OH was conformed to the pseudo-second-order kinetic model. The adsorption rate of MCM-NH 2 -OH (2.62 × 10 -2 g·mg −1 ·min −1 ) was 346.1 times higher than MCM-NH 2 (7.57 × 10 -5 g·mg −1 ·min −1 ). The adsorption mechanism and the role of –NH 2 and –OH groups were investigated by XPS, XRD, and FTIR. More Au(III) can be adsorbed on –NH 2 groups by electrostatic attraction and chelation that provided electron acceptor for –OH groups, which further enhanced the reduction of Au(III) to Au(0). Further, MCM-NH 2 -OH exhibited superior selectivity and reusability for Au(III). Therefore, the synergy between –NH 2 and –OH groups is suitable for efficient adsorption-recover of gold applied in actual wastewater.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Zengliang Ren,Li Lei,Linwei Zhu,Shuimiao Xia,Runhua Fan,Davoud Dastan,Hongzhi Cui,Zhicheng Shi
Polymer dielectrics have broad applications in advanced electronics and power systems. However, they suffer from low energy density and poor breakdown performance at high temperatures, limiting their applications in high-temperature environments. Herein, TiO 2 @Au@AlO x @Au nanofibers with double coulomb blockade nanolayers are obtained via a physical sputtering strategy to improve the high-temperature energy storage performance of polyetherimide composites. Experimental studies and finite elemenet phase-field simulations demonstrate that the double-layer coulomb blockade effect and micro-capacitor effect of Au nanoparticles synergistically enhance the breakdown strength and dielectric permittivity of polyetherimide composite at high temperatures. Notably, the composite exhibits ultra-high discharged energy densities of 11.33 and 9.70 J cm −3 at 150 and 200 °C, respectively, along with high charge–discharge efficiencies of 93.4% and 84%, which far exceed that of the polymer nanocomposites reported so far. Furthermore, the composite exhibits excellent charge–discharge cycling performance (>50000 cycles at 400 MV m −1 ) and high-power density (1.16 MW cm −3 ) at 200 °C, making it an ideal candidate for high-temperature capacitors. Hopefully, these nanofibers not only serve as excellent nanofillers for high-temperature energy storage dielectric composites but also holds tremendous potential and inspirational significance for other applications such as electronics, biomedical fields, optics, and catalysis.
研究领域:
材料科学
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电气工程
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纳米技术
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能源存储
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产品关联
DOI
高影响因子
POLYMER
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2024
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IF 4.1
Tingting Liu,Baijun Liu,Mingyao Zhang
Anisotropic conductive adhesives (ACAs) provide an efficient and easy method of interconnecting small electronic devices compared to traditional solder joint connections. In this paper, PS@Ni/Au metal composite microspheres with excellent electrical conductivity in the size of 2.76 μm were prepared by chemical plating technique and in situ redox method. The effects of PS@Ni metal composite microspheres with different shell thicknesses and compactness on the preparation of Ni–Au bimetallic shell layers were investigated, and the effects of different Au:PS@Ni mass ratios on the volumetric conductivity of PS@Ni/Au metal composite microspheres were discussed. The composite microspheres were characterized by scanning electron microscopy (SEM), thermogravimetric analysis (TGA), energy spectrometry (EDS), and X-ray diffraction (XRD). Thick and compact Ni metal shells are the key to preparing PS@Ni/Au metal composite microspheres with the complete degree of encapsulation. When the mass ratio of Au:PS@Ni was 0.15:1, the conductivity was as high as 1.3 × 10 5 S cm −1 . The acrylate pressure-sensitive containing 3.1–8.3 vol% conductive particles presented an obvious anisotropy. When the mass ratio of the conductive particles was higher than 8.3 vol%, the conductive particles appear to be significantly aggregated. The research ideas and methods have great application potential for replacing the traditional solder joint connections.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
Science China-Chemistry
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2015
·Vol. 58
·期 5
·858-862
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IF 1.695
Tang Jia,Zhou Bin,Zhang Shilin,Wang Zhuang,Xiong Lei,Li Peng
Unique lotus-rootlike Au-ZnO hybrid structures were obtained by controlling the deposition of pre-synthesized Au nanocrystals onto the surfaces of as-obtained ZnO structures. ZnO with lotus-rootlike structures was first prepared through a hydrothermal process. We also investigated the effects of various Au contents on the photocatalytic activities in detail. Notably, compared to the pure ZnO component, these resulting lotus-root-like Au-ZnO nanostructures with the appropriate amounts of Au content exhibited better photocatalytic efficiency.
研究领域:
材料科学
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纳米技术
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光催化
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DOI
高影响因子
RSC Advances
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2016
·Vol. 6
·期 34
·28263-28269
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IF 3.289
Xiumin Ma,Quantong Jiang,Weimin Guo,Meng Zheng,Weichen Xu,Fubin Ma,Baorong Hou
In this study, a sandwich-structured C3N4/Au/CdZnS photocatalyst with Au nanoparticles sandwiched between C3N4 and CdZnS was fabricated. The results showed that there was a 6.3 mmol g−1 increase of hydrogen production for C3N4/Au/CdZnS photocatalyst compared to C3N4/CdZnS in 4 h. The photoinduced I–t curve, electrochemical impedance spectrum (EIS), photogenerated electron lifetime and photoluminescence spectra showed that the photocatalytic ability of the composite was enhanced by anchoring Au as the electron transfer mediator between C3N4 and CdZnS through the Z-scheme charge-carrier transfer mechanism. Au functioned as an electron transition mediator, which could induce a combination between photogenerated electrons and holes in the CdZnS and C3N4, respectively. These photogenerated holes of CdZnS can be involved in the S2−/SO32− oxidation process and the electrons from the C3N4 surface might be involved in the water to hydrogen reduction reaction, thus enhancing the photocatalysis performance of C3N4/Au/CdZnS photocatalyst.
研究领域:
材料科学
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环境科学
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化学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 24
·22284-22296
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IF 2.22
Lv Xuehua,Lan Hai,Guo Jie,Guo Meixian,Yan Ya
AgInS 2 and Au-loaded AgInS 2 (denoted as Au/AgInS 2 ) were prepared by one-pot method with thioacetamide as sulfur source and mercaptoacetic acid as stabilizer. The structure, morphology, and optical properties of the obtained samples were characterized by XRD, XPS, BET, HRTEM, DLS, PL, and UV–vis-DRS. The photocatalytic activities of AgInS 2 and Au/AgInS 2 for the degradation of Rhodamine B (RhB) and 4-Nitrophenol (4-NP) under visible light irradiation were investigated, and the optimal proportions of Au introduced on AgInS 2 for the degradation of RhB and 4-NP were obtained. The possible degradation mechanisms of 4-NP by AgInS 2 and Au/AgInS 2 were proposed based on the active species trapping experiment, optical properties characterization, and the flat potential determination. The results showed that Au was successfully introduced on the surface of AgInS 2 nanoparticles, and the photocatalytic degradation efficiencies of Au/AgInS 2 toward RhB and 4-NP were higher than those of AgInS 2 . 5%Au/AgInS 2 was the optimal proportion for the degradation of RhB, and the degradation efficiency could reach 98% in 30 min, while 7.5%Au/AgInS 2 was the best proportion for the degradation of 4-NP, and the degradation efficiency could reach 100% in 30 min. The enhanced visible light photocatalytic performances of Au/AgInS 2 could be attributed to the stronger visible light absorption and the lower recombination probability of photogenerated electron–hole pairs. Active species trapping experiment suggested that the main active species was superoxide radical (·O 2 − ) for the degradation of RhB by Au/AgInS 2 , while for the degradation of 4-NP, the main active species were superoxide radical (·O 2 − ) and hydroxyl radical (·OH).
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Catalysts
·
2021
·Vol. 11
·期 11
·1414
·
IF 4.146
Yekun Ji,Ye Zhou,Jinnan Wang,Aimin Li,Weilin Bian,Philippe François-Xavier Corvini
A visible-light-Fenton-like reaction system was constructed for the selective conversion of peroxymonosulfate to sulfate radical. Au@CoS, when doped on monoclinic BiVO4{010} facets, promoted spatial charge separation due to the different energy band between the m-BiVO4{010} and {110} facets. The visible-light response of m-BiVO4was enhanced, which was attributed to the SPR effect of Au. And the photogenerated electrons were transferred from the m-BiVO4{010} facet to Au via a Schottky junction. Owing to higher work function, CoS was able to capture these photoelectrons with acceleration of the Co(Ⅱ)/Co(Ⅲ) redox, enhancing peroxymonosulfate conversion to sulfate radical (Co2++ HSO5−→ Co3++ •SO4−+ OH−). On the other hand, holes accumulated on m-BiVO4{110} facets also contributed to organics oxidation. Thus, more than 95% of RhB was degraded within 40 min, and, even after five cycles, over 80% of RhB could be removed. The radical trapping experiments and EPR confirmed that both the sulfate radical and photogenerated hole were the main species for organics degradation. UV-vis DRS, photoluminescence (PL) and photoelectrochemical analyses also confirmed the enhancement of the visible-light response and charge separation. In a pilot scale experiment (PMS = 3 mM, initial TOC = 151 mg/L, reaction time = 4 h), CoS-Au-BiVO4loaded on glass fiber showed a high mineralization rate (>60%) of practical wastewater.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
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2023
·
IF 5.5
Xiaoyuan Liu,Yu Zou,Jiang Jiang
Photocatalytic valorization is a sustainable approach for converting glycerol to value-added chemicals under ambient conditions, which remains challenging. Herein, using Au/TiO 2 as photocatalyst, we report glycerol oxidation reaction in non-pressurized reactor with borate additives. The activity and selectivity of photocatalytic glycerol oxidation depends on Au loading, borate concentration and solution pH. Both superoxide and hydroxyl radicals are generated due to oxygen reduction and water oxidation by photoexcited charge carriers. Apart from coordinating and protecting the oxidized intermediates from further oxidation, borate additives are discovered to up-regulate the superoxide radical generation, beneficial for C3 products formation. In pH 12 solution, C3 products selectivity of 58% and 37% on liquid-phase and carbon basis respectively, was realized at 94% glycerol conversion under AM 1.5 G irradiation for 4 h. Our finding may help guiding future catalyst design for photocatalytic biomass valorizations, where a balanced oxidative power is needed to steer the reaction pathway.
研究领域:
化学工程
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可再生资源转化
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环境科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）