Progress in Natural Science-Materials International
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2024
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IF 4.8
Xue Deng,Siyang Wang,Qianqian Ren,Xintong Yan,Wenbo Zhao,Jianzhong Cui,Shi Hu
Energy transition towards net-zero society calls for utilization of renewable power to drive CO 2 conversion in an efficient electrochemical way. The development of a commercial CO 2 electrolyzer with positive tech-eco effect calls for active and durable electrocatalysts. High-loading gold on carbon (Au/C) with reduced particle size is the prerequisite for the highly-selective and highly energy-efficient CO production in such a CO 2 electrolyzer, but a scalable synthetic method is missing. With combined control of ligand, substrate and pH value, Au/C catalysts with particle size within 5 nm and metal loading of 40 wt% and 60 wt% are synthesized on low and high surface-area carbon, respectively. We also provide a thorough investigation of the effect of the ligand type, surface charge of gold nanoparticles (Au NPs) and surface area of carbon substrate on the loading limit of Au/C.
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ANALYTICAL BIOCHEMISTRY
·
2024
·
IF 2.6
Xiaoting Li,Xin Li,Jiayi Chen,Zuomin Tan,Chuan Wang
Bacteremia , as a serious infectious disease, has an increasing incidence and a high mortality rate . Early diagnosis and early treatment are crucial for improving the cure rate. In this work, we proposed an inductively coupled plasma mass spectrometry (ICP-MS)-based detection method combined with gold nanoparticle (Au NP) and silver nanoparticle (Ag NP) labeling for the simultaneous detection of Salmonella and Escherichia coli ( E. coli O157:H7) in human blood samples. Salmonella and E. coli O157:H7 were captured by magnetic beads coupled with anti-8G3 and anti-7C2, and then specifically labeled by Au NP-anti-5H12 and Ag NP-anti-8B1 respectively, which were used as signal probes for ICP-MS detection. Under the optimal experimental conditions, the limits of detection of 164 CFU mL −1 for Salmonella , 220 CFU mL −1 for E. coli O157:H7 and the linear ranges of 400–80,000 CFU mL −1 Salmonella , 400–60,000 CFU mL −1 E . coli O157:H7 were obtained. The proposed method can realize the simultaneous detection of two types of pathogenic bacteria in human whole blood in 3.5 h, showing great potential for the rapid diagnosis of bacteremia in clinic.
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高影响因子
Materials Chemistry Frontiers
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2024
·
IF 6
Jin Li,Wei Zhang,Xiujing Xing,Yaokang Lv,Renliang Lyu,Wei Xiong,Hao Li
Gold nanoparticles are extensively employed in the field of electrocatalytic nitrite reduction for ammonia synthesis, due to their exceptional conductivity and remarkable stability. However, the performance of a single metal is often limited and by combining different metals, the overall performance can be significantly improved to meet specific needs and application scenarios. The regulation of the interaction between loaded gold nanoparticles and metal oxide support materials represents an effective strategy for facilitating the reduction of nitrite to ammonia. In this work, we prepared three different structural morphologies of cerium dioxide (CeO2) – cubic (c-CeO2), rod-like (r-CeO2) and granular (p-CeO2), by modulating the hydrothermal temperature. The effect of the morphology of the CeO2 carriers on the surface structure of the composite catalyst, CeO2@Au, was systematically studied and its performance of the electrocatalytic reduction of ammonia from nitrite was explored. It was found that c-CeO2 loaded with Au nanoparticles possessed better electrocatalytic performance with an ammonia yield of 4007.9 μg h−1 mgcat−1 and a Faraday efficiency of 91.2% compared to r-CeO2 and p-CeO2. The results of the characterisation tests, conducted using scanning electron microscopy (SEM), elemental mapping analysis (EDS) and inductively coupled plasma (ICP), demonstrate that c-CeO2 exhibits enhanced crystallinity, a reduced particle size and a more uniform dispersion. Therefore, c-CeO2 is able to load more Au nanoparticles during the complexation process with Au, which in turn possesses more reactive active sites. In addition, the results of transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) showed that after the complexation of c-CeO2 with Au, some of the lattice fringes of c-CeO2 were distorted with defects leading to an increase in the content of oxygen vacancies, which greatly improved the active area of the catalyst. These physicochemical properties endow the c-CeO2@Au catalysts with excellent electrocatalytic nitrite-to-ammonia activity.
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ACS Applied Nano Materials
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2024
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IF 5.3
Mingchong Sui,Fangqing Wang,Caichi Liu,Qiuyan Hao,Ying Li,Hui Liu,Limin Liang
Cobalt–iron layered double hydroxide (CoFe LDH) is considered an advanced electrocatalyst toward the alkaline oxygen evolution reaction (OER), yet its poor stability is still a huge challenge. Here, based on an innovative spontaneous redox reaction (SRR) method, we synthesize a gold-nanoparticle-decorated CoFe LDH heterostructure on nickel foam (Au/CoFe LDH/NF) at room temperature. The heterostructure catalyst not only exhibits a low overpotential of 233 mV at 10 mA cm–2 but also displays 400 h stability without any degradation at ∼200 mA cm–2. The experimental and density functional theory (DFT) calculations validate that Au/CoFe LDH/NF with strong electronic coupling at the interface optimizes the electronic structure, reducing the OER energy barrier. In situ Raman spectra demonstrate that the transfer of electrons from Au nanoparticles to CoFe LDH alleviates the structural distortion of the catalyst during the OER, which is responsible for the strengthened stability.
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IEEE SENSORS JOURNAL
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2024
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IF 4.3
Cuixian Luo,Yimeng Dong,Yongjiao Sun,Yurong Huang,Lingrong Xue,Lifang Ren,Daming Wang,Minzhe Qin,Xinke Li
Tungsten disulfide (WS2) is emerging with dazzling visibility as a “layered material beyond graphene and molybdenum disulfide” due to its exquisite tunable electronic, surface structure, high carrier mobility, and physicochemical stability. In this article, In2O3 and Au nanoparticles (NPs) co-modified WS2 microsheets were prepared for detecting NO2 at room temperature (RT). The In2O3 and Au NPs were anchored on the surface of WS2 microsheets, which could be observed by the characterization. The NO2 sensing performance at RT was optimized by adjusting the contents of In2O3 and Au NPs. The proposed gas sensor based on Au1WIn6 (WS2 microsheets co-modified with 6 wt% In2O3 and 1 wt% Au NPs) showed the highest response (46.91 to 50 ppm NO2), limit of detection (LOD; 18.9 ppb), excellent linearity within the test range, and good stability under various relative humidity (RH), bending degrees, and bending times. The excellent result is attributed to the formation of a heterojunction, which increases the number of ionized oxygen adsorption sites and facilitates the reaction between NO2 gas and Au1WIn6. Therefore, it is believed that decorating WS2 microsheets with metal oxide and noble metal NPs is a promising strategy to improve the NO2 sensing property at RT.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2025
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IF 4.6
Hongcheng Gao,Zhenzhen Xie,Shihao Xu,Changlong Jiang
The relationship between human health and patulin (PAT) in the diet is a complex and intertwined one. The development of a sensing approach for the field detection of patulin is crucial, as the current approach lacks real-time detection capabilities and is costly in terms of material and technology. This paper presents a portable ratiometric fluorescence sensor that can be used to rapidly, accurately, and efficiently detect patulin in food items at the point of origin. The sensor employs a combination of sulfhydryl functionalized gold nanoclusters (MUA-AuNCs) and blue emission carbon dots (B-CDs), which have been engineered to serve as highly effective “on-off” nanoprobes. The modified sulfhydryl ( SH) groups present on the gold clusters serve as specific recognition sites for patulin binding. The probes exhibit a discernible shift in hue, from orange-red to blue. The sensitivity detection limit (LOD) for patulin was found to be 0.019 μM, with a substantial linear correlation observed in the range of 0–2.2 μM. The objective of the combined chromatographic test strip and color recognition platform was to facilitate the sensitive, accurate, and real-time detection of patulin in foodstuffs, which is of paramount importance for the prevention of early disease. To facilitate rapid and straightforward preliminary testing of food security, it is anticipated that the integrated chromatographic strip ratiometric fluorescence sensing platform will be developed into portable home detection equipment.
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高影响因子
MOLECULES
·
2024
·Vol. 29
·期 17
·4051
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IF 4.2
Chunxia Qi,Ang Li,Baoming Wu,Peisan Wang
Multifunctional targeted drug delivery systems have been explored as a novel cancer treatment strategy to overcome limitations of traditional chemotherapy. The combination of photodynamic therapy and chemotherapy has been shown to enhance efficacy, but the phototoxicity of traditional photosensitizers is a challenge. In this study, we prepared a multi-sensitive composite hydrogel containing gold nanoclusters (Au NCs) and the temperature-sensitive antitumor drug 5-fluorourac il (5-FU) using carboxymethyl cellulose (Carr) as a dual-functional template. Au NCs were synthesized using sodium borohydride as a reducing agent and potassium as a promoter. The resulting Au NCs were embedded in the Carr hydrogel, which was then conjugated with lactobionic acid (LA) as a targeting ligand. The resulting Au NCs/5-FU@Carr-LA composite hydrogel was used for synergistic photodynamic therapy (PDT), photothermal therapy (PTT), and chemotherapy. Au NCs/5-FU@Carr-LA releases the drug faster at pH 5.0 due to the acid sensitivity of the Carr polymer chain. In addition, at 50 °C, the release rate of Au NCs/5-FU@Carr-LA is 78.2%, indicating that the higher temperature generated by the photothermal effect is conducive to the degradation of Carr polymer chains. The Carr hydrogel stabilized the Au NCs and acted as a matrix for drug loading, and the LA ligand facilitated targeted delivery to tumor cells. The composite hydrogel exhibited excellent biocompatibility and synergistic antitumor efficacy, as demonstrated by in vitro and in vivo experiments. In addition, the hydrogel had thermal imaging capabilities, making it a promising multifunctional platform for targeted cancer therapy.
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Materials
·
2025
·Vol. 18
·期 5
·969
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IF 3.2
Shipeng Chen,Jinglan Xu,Dingchuan Huang,Weiwei Zhang,Tian Zhang,Liangliang Xiong,Xiaoqiang Fan
The Ni-Au coating with its inherent chemical stability is recognized as an effective method for boosting corrosion resistance in humid environments while preserving exceptional electrical conductivity. However, its anti-corrosion performance is affected by the structure characteristics of the coating due to the high corrosion potentials of Au and Ni. To enhance its protection properties, the deposition process parameters, including deposition time, deposition current density, and zincating times, were investigated. The morphology and structure of the coatings were characterized, while its anti-corrosion performance was assessed through electrochemical and accelerated salt-spray tests. Eventually, the elevated current density in the Ni-Au coating resulted in reduced grain size and improved surface morphology, ensuring superior anti-corrosion performance. Additionally, extending the Ni deposition time provided a second physical barrier for the dense and thick Ni layer to resist the invasion of corrosive media. Furthermore, grey theory was applied to predict the service life of the Ni-Au coating. This research provides valuable insights and constructive guidance for optimizing Ni-Au coating in various engineering applications.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2024
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IF 8.2
Lin Zhu,Wei Zeng,Yueqing Li,Yu Han,Jing Wei,Long Wu
In this work, on the basis of Fe 3 O 4 @Au-Pt nanozymes (MAP NZs) and aptamer recognition, a magnetic fluorescent aptasensor (MFA) was developed for sensitive and accurate detection of saxitoxin (STX). With the bridge of STX aptamer (Apt STX ) and complementary DNA (cDNA), Apt STX decorated MAP NZs (MAP/Apt) and cDNA modified green quantum dots (cDNA@g-QDs) were connected to form MAP/Apt-cDNA@g-QDs complex. As STX behaves a strong binding ability towards Apt STX , it will compete with cDNA and hybridize with Apt to release cDNA@g-QDs. With the addition of TMB, MAP will catalyze TMB to the oxidized TMB (ox-TMB), thereby quenching the fluorescence of g-QDs due to the inner filter effect. Based on this finding, the quantitative relationship between the change in fluorescence of gQDs and STX concentration was explored with a limit of detection (LOD, S/N = 3) of 0.6 nM. An internal standard signal of oxTMB was adopted and reduced the fluctuation of fluorescence signal output. Besides, the fluorescence probe can selectively recognize and detect STX among five marine toxins. Eventually, the MFA method behaved good performance in detecting seafood samples with recoveries of 82.0 % ∼ 102.6 % as well as coefficient of variations (CV) of 7.2 % ∼ 10.3 %. Therefore, the method with internal signal is hopeful to be a potential candidate for sensitive and accurate detection of STX in seafood.
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HYDROMETALLURGY
·
2024
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IF 4.8
Ronghao Liu,Jun Li,Xiaoxia Liu,Xiaolu Yin,Yanzhao Yang
The effective and environmentally friendly recovery of gold from secondary resources has recently received increased attention. Hydrophobic deep eutectic solvent (HDES) composed of N , N -di-butylacetamide and 1-decanoic acid was used to construct the liquid-liquid extraction system to extract Au(III) from HCl medium. At first, DSC, TGA, FT-IR, and 1 H NMR were used to describe the evidence of internal hydrogen bond interaction. The above evidence was verified in the molecular dynamics study of HDES. Then, a series of optimization experiments were carried out to investigate the extraction behaviors of HDES. Based on the results of optimization experiments, response surface method was used to explore the best experimental conditions and the results showed that HDES extracted 99% Au(III) under 0.56 mol/L HCl, 2.19 mol/L NaCl, and 5.83 mmol/L Au(III), and the maximum loading reached 77.0 mg/g. Further studies on the kinetics and thermodynamics of the extraction were used to propose an ion association mechanism. In addition, using 0.1 mol/L thiourea as the stripping agent, HDES displayed outstanding Au(III) selectivity and maintained the extraction efficiency in tests which involved 5-cycles. Overall, this study provides a green and efficient Au(III) recovery strategy for secondary resources.
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ACS Sustainable Chemistry & Engineering
·
2024
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IF 7.1
Wei Zhang,Tianyi Wang,Xiujing Xing,Huhu Yin,Jin Li,Wei Xiong,Hao Li
The electrocatalytic nitrite reduction reaction (NO2–RR) occurs under mild conditions at ambient temperature and pressure and can convert nitrite pollution into recycled ammonia. This method has great application potential in the purification of the water environment and the field of synthetic ammonia. In this article, we present a method to synthesize relatively uniformly dispersed gold nanoparticles on the surface of carbon cloth fibers (Au@CC) by hydrothermal self-assembly growth and calcination without the use of adhesive in the process. We studied the influence of different surfactants on the distribution and particle size of gold nanoparticles on carbon cloth by mechanism study and explored their effects on NO2–RR performance. The results showed that Au@CC with gold nanoparticles relatively uniformly dispersed on the surface of carbon cloth fibers and small particle size (≈86.2 nm) could be obtained when the sample was synthesized by the surfactant sodium dodecyl sulfate (SDS). This is mainly due to the strong coordination between SDS and the gold precursor and that the hydrophobic group of SDS can interact with the surface carbon cloth. When performed in the 0.1 M phosphate buffered saline (PBS) (with 0.1 M NaNO2) solution, the Au@CC-SDS electrode gave a high NH3 yield of 1249.1 μg h–1 cm–2 and faradaic efficiency of 80.7%. The density functional theory (DFT) calculations clarified the electrocatalytic reaction mechanism of the NO2–RR to NH3 on the Au active site. Thus, this study demonstrated that SDS is beneficial to the formation of relatively uniformly dispersed gold nanoparticles supported on carbon fiber cloth (Au@CC) and proved that gold-based nanomaterials are a promising catalyst for electrocatalytic NO2–RR ammonia synthesis.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Tianci Zheng,Yanfei Zhu,Rui Ma,Liguang Bai,He Yu,Shixi Zhao,Yufei He,Yanan Liu,Dianqing Li
Hydrogenation of unsaturated C≡C groups is a promising way to realize ethylene purification in petrochemical processes and produce value-added products. Gold catalysts are known to exhibit satisfactory selectivity toward olefins. However, it still remains a grand challenge to improve the activity and inhibit the heavy coke effect while balancing the selectivity. This article describes the construction of Cu vacancies at an abrupt surface over a Au–Cu alloy catalyst to effectively promote the activation and dissociation of hydrogen, thereby reducing the activation energy barrier. More importantly, the generation of abundant Cu vacancies contributes to the electronic interaction with the adjacent second metal to generate coordination unsaturated and electron-deficient Au species, which facilitates the desorption of product intermediates. Consequently, the activity and selectivity of the acid-etched Au3Cu1/TiO2 are much higher than those of the untreated Au–Cu and monometallic Au catalysts. This report opens up promising possibilities for engineering highly efficient heterogeneous gold catalysts.
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