ACS Applied Nano Materials
·
2023
·
IF 5.9
Jinyu Huang,Zichao Ma,Junda Li,Zhonglei Zhang,Jihua Tang,Xiangdong Cao,Wei Xu,Xiaojin Zhao,Yatao Yang,Xiaofang Pan,Yu Du
Detecting the trace ppb level of formaldehyde (HCHO) in indoor ambient and human exhaled breath using a metal oxide semiconductor gas sensor has attracted increasing attention. A hybrid nanostructure consisting of In2O3 nanoparticles grown on a Au nanocage (NC) surface was synthesized using a one-step solvothermal method, which was then used to be fabricated as HCHO sensors. The 0.5 wt % Au NC/In2O3 sensor featured an ultrahigh response of 8.8 for 1 ppm of HCHO at a low operating temperature (145 °C), which was nearly 2.5 times higher than that of the pure In2O3 sensor. Furthermore, it possessed outstanding selectivity and a low detection limit (25 ppb) toward HCHO. This excellent sensing property was possibly due to the increase in chemisorbed oxygens on its surface due to the Au NC spillover mechanism, an enhanced adsorption capability for HCHO because of the phase transition from cubic to rhombohedral In2O3, good gas diffusion, and a large surface area with a Au NC/In2O3 3D hierarchical structure, as well as the widened electron depletion layer derived from the Schottky barriers and homojunctions between the components of Au NC/In2O3.
研究领域:
材料科学
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传感技术
·
环境监测
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Zhaofei Liu,Xinyue Wang,Yuhang Wei,Weiwei Xie,Song Li,Zhiming Chen
As a biomarker of endocrine gland diseases, the rapid and accurate determination of dopamine has a great significance. The aim of this study was to improve the dopamine biosensing performance of the Fe 3 O 4 @CS-Au-Lac (laccase immobilized on Fe 3 O 4 @CS-Au nanocomposites) by using the photothermal effect of magnetic carriers. Electrochemical impedance spectroscopy measurements revealed that the Fe 3 O 4 @CS-Au nanocomposites enhanced the electron transfer between laccase and the electrode. The Fe 3 O 4 @CS-Au-Lac biosensor presented an ultra-fast response to substrates, accurately detected dopamine within 0.2 s. Dopamine biosensing assays demonstrated that the Fe 3 O 4 @CS-Au-Lac biosensor possessed high sensitivity, remarkable tolerances towards organic compounds and metal ions, and excellent selectivity and stability. Amperometric curves indicated that the illumination brought a higher current to the biosensor compared to the dark environment. The Fe 3 O 4 @CS-Au-Lac biosensor held a low detection limit of 0.79 μM (S/N = 3) and a broad linear range of 1–1000 μM under the irradiation. Most significantly, the Fe 3 O 4 @CS-Au-Lac biosensor provided reliable results in the photothermal analysis of dopamine in synthetic urine samples. This finding paves the way for using the Fe 3 O 4 @CS-Au-Lac biosensor for photothermal detection of dopamine in biomedical applications.
研究领域:
生物医学工程
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分析化学
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纳米材料科学
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DOI
高影响因子
Molecular Catalysis
·
2020
·
IF 3.687
Jiajun Dai,Yunlong Guo,Luhang Xu,Guilin Zhuang,Yi Zheng,Daohua Sun,Jiale Huang,Qingbiao Li
Bovine serum albumin (BSA)-templated CeO 2 was prepared by citrate sol-gel method and used as a support to synthesize Au catalyst for benzene oxidation. It was found that the Au/BSA-CeO 2 with 3.2 nm Au nanoparticles (NPs) gave rise to superior catalytic performance for benzene oxidation in which the temperature for 90 % benzene conversion was only 210 °C. In addition, the catalytic activity of Au/BSA-CeO 2 remained stable for 140 h of on-stream reaction. Besides, density functional theory calculation demonstrated how the porous structure of CeO 2 influenced the oxygen vacancy generation, and the synergetic effects of Au NPs and CeO 2 support facilitated the activation of benzene which was adsorbed on Au NPs prior to benzene oxidation. The catalysis of benzene oxidation over Au/CeO 2 catalyst follows the dual-site mechanism. BAS-templated CeO 2 support possessed hierarchical structure, abundant adsorbed oxygen species and synergic interaction with Au that determined the performance of Au/BSA-CeO 2 .
研究领域:
催化化学
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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
ANALYST
·
2015
·Vol. 140
·期 6
·1913-1920
·
IF 4.107
Cong Li,Jingyu Zhao,Xiaoyi Yan,Yue Gu,Weilu Liu,Liu Tang,Bo Zheng,Yaru Li,Ruixue Chen,Zhiquan Zhang
Electrochemical detection of dopamine (DA) plays an important role in medical diagnosis. In this paper, tremella-like graphene–Au (t-GN–Au) composites were synthesized by a one-step hydrothermal method for selective detection of DA. Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Raman spectroscopy, and Fourier transform infrared (FTIR) spectroscopy were used to characterize as-prepared t-GN–Au composites. The t-GN–Au composites were directly used for the determination of DA via cyclic voltammetry (CV) and the chronoamperometry (CA) technique. CA measurement gave a wide linear range from 0.8 to 2000 μM, and the detection limit of 57 nM (S/N = 3) for DA. The mechanism and the heterogeneous electron transfer kinetics of the DA oxidation were discussed in the light of rotating disk electrode (RDE) experiments. Moreover, the modified electrode was applied to the determination of DA in human urine and serum samples.
研究领域:
医学诊断
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材料科学
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电化学
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Yu-fang Fu,Jian Zhu,Xin Li,Guo-jun Weng,Jian-jun Li,Jun-wu Zhao
In this work, we synthesized Au-Ag alloy nano-garlands with multiple petal-like branches and internal cavities in two steps. First, we etched silver nanospheres with HAuCl 4 to obtain Au-Ag alloy nanoshells with different shell layer thicknesses and hollow core sizes. After that, based on different nanoshells, 4-NTP was used as a shape-directing agent, HAuCl 4 and AgNO 3 as precursor raw materials, and AA as a reducing agent for the growth of petals to form Au-Ag bimetallic nano-garlands with multi-branching structure. The regulation of the branching morphology of the nano-garlands could be achieved by changing the amounts of 4-NTP and HAuCl 4 . The SERS activity of the nano-garlands could be further improved by changing the AA concentration, the size of nanoshells, and the Au/Ag ratio of the precursor raw materials. Because the bimetallic nano-garlands have hollow cavities and petal-like branches, there are couplings between the cavities and the branches, between the adjacent branches, and between the metals inside and outside of the cores, which can achieve a good enhancement of SERS. The highest SERS enhancement factor of Au-Ag bimetallic nano-garlands can reach 4.47×10 8 , which can be used as a good candidate for SERS substrate for the trace detection of biomolecules , pesticides, and other substances.
研究领域:
材料科学
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纳米技术
·
分析化学
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产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2018
·
IF 6.759
Renshan Wang,Benxia Li,Yi Xiao,Xueqin Tao,Xintai Su,Xiaoping Dong
Ultrathin semiconductor nanosheets decorated with metallic nanoparticles (NPs) are promising in photocatalysis due to the multi-component interactions. The materials with a series of monometallic Pd and bimetallic Au-Pd NPs anchored on Bi 2 WO 6 ultrathin nanosheets were synthesized and developed as photocatalysts for selective oxidation of aromatic alcohols to aromatic aldehyde. By optimizing the metallic contents, a typical sample of Au(0.25)Pd(0.25)-Bi 2 WO 6 exhibited the highest photocatalytic activity among all the prepared photocatalysts including Au(0.5)-Bi 2 WO 6 , Pd( x )-Bi 2 WO 6 , Au( x )Pd( x )-Bi 2 WO 6 ( x represents the weight percentage of metal in the photocatalyst), along with the improved selectivity for producing benzaldehyde. The extended absorption in visible range, higher efficiency for the transfer and separation of photogenerated charge carriers, and the superior ability for generating active radicals of Au(0.25)Pd(0.25)-Bi 2 WO 6 were demonstrated by DRS spectra, photoelectrochemical measurements, and ESR detection. The effect of the active species for selective oxidation of aromatic alcohols was proved to follow the order of h + + O 2 − > h + >> O 2 − . Accordingly, a possible mechanism based on the interfacial cooperation between bimetallic Au-Pd NPs and Bi 2 WO 6 ultrathin nanosheets was proposed to illustrate the photocatalytic process, where the holes accumulated in Bi 2 WO 6 ultrathin nanosheets and O 2 − produced on metallic NPs synergistically promote the selective oxidation of aromatic alcohols.
研究领域:
材料科学
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环境科学
·
化学工程
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产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2018
·
IF 2.891
Zhangbao Chen,Shanshan Wang,Xiaoming Yang
Herein, one type of carbon dots (CDs) directed by l -threonine has been innovatively synthesized on the basis of a facile approach. Meanwhile, the CDs mainly consisted of C, O, N, and P according to the detailed characterizations. Importantly, the CDs obtained here not only exhibited the bright-blue fluorescence and generally acceptable stability, but also showed the promising for detecting Au 3+ and l -methionine. To be specific, the off-process by an obvious fluorescence quenching of the CDs achieved assaying Au 3+ , and Au 3+ could be removed by the introduction of l -methionine through the stronger interaction between Au 3+ and l -methionine, and thus leading to the fluorescence of CDs recovered. Consequently, the quantitative analyses of Au 3+ concentration in a linear range of 6 μM–1 mM was obtained along with the range from 80 μM to 1 mM for l -methionine. In addition, the practicability of this proposed method was validated by the detections of the lake samples, suggesting that it could broaden the sensing strategies for assaying both Au 3+ and l -methionine.
研究领域:
分析化学
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生物传感
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环境科学
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产品关联
DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2013
·Vol. 110
·期 2
·437-448
·
IF 1.104
Cui Wenjing,Jia Meilin,Ao Wulan,Zhaorigetu Bao
Nano-gold catalysts were prepared by the liquid reduction method and employed in the oxidative esterification of alcohols under ambient conditions. The effects of the supports and gold loading on the catalytic behavior were investigated. The catalysts were characterized by transmission electron microspectroscopy, X-ray diffraction, X-ray photoelectron microspectroscopy and atomic absorption spectrometry. The results indicated that nano-scale metallic state gold was highly dispersed on the support. 95 % methyl benzoate yield was obtained over 3 wt% Au/ZrO 2 catalyst at 30 °C under air atmosphere. Under optimized reaction conditions, benzyl alcohols with electron-withdrawing groups could give high selectivity to the corresponding methyl ester at moderate conversion of alcohols. However, when a benzyl alcohol with electron-donating group was used, high conversion of alcohol but low selectivity of the corresponding methyl ester was obtained. Low yields were obtained with aliphatic alcohols as substrates even at high temperature. The kinetic analysis of the oxidation from benzyl alcohol to benzaldehyde and from benzaldehyde to methyl benzoate was also described. The facile and simple procedure was a great option for direct synthesis of methyl esters from alcohols.
研究领域:
催化化学
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材料科学
·
有机合成
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Xixian Huang,Nengwu Zhu,Fulin Mao,Yang Ding,Sihai Zhang,Fei Li,Huangrui Liu,Pingxiao Wu
Tailoring economical g-C 3 N 4 -based composites with efficient visible-light photocatalytic degradation ability have received great attention. In this study, a novel and efficient visible-light photocatalyst, Au nanoparticles doped porous carbon modified g-C 3 N 4 (Au@C/g-C 3 N 4 ), was synthesized using thermal polycondensation method. The crystal, morphological and photoelectrical characterizations verified the successful synthesis of Au@C/g-C 3 N 4 hybrid and it had larger specific area and narrower band gap than that of pure g-C 3 N 4 . The optimal Rhodamine B (RhB) photocatalytic oxidation performance (94.3%) and mineralization rate (50.7%) were obtained by Au@C/g-C 3 N 4 -2 composite at 1.0 g L −1 catalyst dosage and pH of 5.0, which was 3.23 and 2.96 times, respectively than that of g-C 3 N 4 at the same conditions. Au@C/g-C 3 N 4 -2 also maintained satisfactory RhB degradation efficiency (70.7%) after 4 consecutive photocatalytic cycles. Mechanism analyses indicated that the significantly improved photocatalytic activity of Au@C/g-C 3 N 4 composite mainly attributed to the rapid separation and migration of charge carriers via the interfacial interaction between the Au@C and g-C 3 N 4 , which resulted in the accelerated O 2 − generation for organic pollutants oxidation. In general, this study supplied a novel strategy for efficient g-C 3 N 4 visible-light photocatalysts construction, and further clarified its plausible visible-light photocatalytic mechanism.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Ziqiong Yang,Xun Liu,Shiying Xia,Qiong Ding,Haiyan Liu,Zhengxi Wang,Long Zhang,Haibo Zhang
The discharges from urban industries and domestic sewages have caused severe environmental pollution problems. Specifically, dyes are among the pollution sources that are relatively difficult to treat. In this study, Au/CB6-BOFs (BOFs namely closo -dodecaborate-based supramolecular organic frameworks) were successfully synthesized using a simple method. The sample was used as adsorbent and degradation agents on Congo red (CR) and methyl orange (MO). The adsorption effect of Au/CB6-BOFs on CR is excellent with the adsorption capacity reaching as high as 2178.36 mg g −1 . Experiments, including adsorption kinetics , isothermal adsorption, and adsorption thermodynamics, were conducted on Au/CB6-BOFs to verify its performance, which confirmed that the adsorption type is monolayer chemical adsorption and that the reaction proceeds spontaneously. Au/CB6-BOFs can lead to catalytic degradation of dye molecules in aqueous solution with the addition of sodium borohydride. The adsorption/degradation ability of Au/CB6-BOFs can be maintained for at least five times without significant attenuating. FT-IR spectroscope and XRD were used to investigate Au/CB6-BOFs changes before and after experiments, there has been no obvious change observed in the FT-IR and XRD results. The catalytic mechanism was also proposed based on the degradation performance. In previous reports, it is might impossible to see similar nanomaterials that combine dye adsorption and dye degradation . If our material does either of them alone, it has a good effect. Considering that Au/CB6-BOFs have two functions at the same time, the initial concentrations of dyes that we set are relatively high, which is beyond the relevant literature reports. Therefore, it has certain reference value and impelling function to shorten the subsequent industrial treatment process of dye wastewater. This study provides a simple method to design and synthesis adsorption/degradation agents, which may open a new path for dye wastewater treatment .
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
Materials Research Express
·
2020
·Vol. 7
·期 2
·025027
·
IF 1.929
Hong Zhao,Diandian Liu,Shujuan Xu,Yao Chen,Fujun Yin,Tao Yang,Mingyan Wang,Hua Deng,Wei Zhang,Weiwei Liu,Xiaohong Liu
Active electrocatalysts are the key to water splitting for hydrogen production through the electrolysis. In this paper, 50 nm silver nanoplates were used as templates for synthesis of Au–Ag island-shaped nanoplates by controlling the surface chemistry. The guiding mechanism of polyvinylpyrrolidone (PVP, Mw = 40 000) to Au–Ag island-shaped nanoplates crystal was also further investigated. It is found that the surface energy of Ag nanoplates between (100) and (111) crystal planes can be regulated by varying the amount of PVP in the system. Then a uniform Au-Ag triangular island nanostructure was obtained. Compared with the Ag nanoplates catalysts, the Au–Ag island nanoplates catalysts show the superior catalytic performances in hydrogen evolution electrocatalysis (HER). These results demonstrate a new surface chemistry modification by PVP and a galvanic displacement reaction for designing the active electrocatalysts. More importantly, the Au–Ag island-shaped nanoplates show an unconventional growth mode of preserving the original Ag nano-triangular crystal structure. The enhanced performance in electrocatalysis can be mainly attributed to Au–Ag alloy structure, which allows the appearance of synergistic effects. The present work demonstrates the crucial roles of surface chemistry in catalysts synthesis, which may guide the design of active bimetallic catalysts.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Lingyuan Chen,Jiali Tang,Suoque Wu,Shixing Wang,Zhaogang Ren
A pyridine-modified chitosan ( PMCS ) adsorbent with excellent adsorption performance and specific selectivity for Au(III) in wastewater was prepared. FTIR, SEM, XPS and XRD were used to study its adsorption performance, and various models were used to fit and analyze the experimental adsorption data. The maximum adsorption capacity of PMCS for Au(III) is 549.41 mg/g (298 K, pH = 4). The data analysis results prove that the PSO and Langmuir models best describe the adsorption process. Adsorption experiments in the presence of multiple ions proved that PMCS is selective for the adsorption of Au(III). The adsorption and desorption experiments showed that the adsorption rate of PMCS could still reach 94.77% after three cycles. In summary, PMCS was demonstrated to be a high-quality material for the adsorption of Au(III) from wastewater due to its excellent adsorption performance, specific selectivity and reusability.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）