Metals
·
2023
·Vol. 13
·期 4
·754
·
IF 2.9
Qihang Wan,Jun Li,Zhang Liu,Lu Han,Siyi Huang,Zumin Wang
In this paper, nanoporous gold (NPG) thin films with superior catalytic performance were prepared on glassy carbon electrodes (GCE) by optimizing the process parameters and adopting an improved solid-phase reaction method. The morphology and structures of NPG films were comprehensively investigated and the structural defects on continuous NPG ligaments were observed. The NPG films demonstrated higher sensitivity and a lower detection limit during the amperometric sensing of aniline than NPGs made using conventional techniques. The results of multiple electrochemical tests demonstrated that the NPG/GCE electrodes possess high stability and good reproducibility. The prepared NPG film is a favorable material that can be superior in aniline electrochemical detection and can also be applied in other electrochemical sensing reactions.Keywords:NPG;sensor;aniline;electrochemistry
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Zhongxin Zhuang,Yan Chen,Kankan Chen,Zhonggang Liu,Zheng Guo,Xingjiu Huang
The exploration of advanced electrochemical sensors towards highly toxic arsenic(III) has attracted growing interest in recent times. Herein, a ZnO decorated nanoporous Au (NPG) microelectrode was fabricated via a facile electrochemical alloying/dealloying method followed by thermal treatment, and developed for the electrochemical sensing of toxic As(III). Inspired by the electrochemical deposition of Zn and the formation of Au-Zn nanostructure on the surface of the Au microelectrode during the alloying/dealloying process, the in-situ evolution of the formed Au-Zn nanostructure to ZnO nanoparticles wrapped on the nanoporous Au surface was achieved. The ZnO/NPG microelectrode exhibited excellent electrochemical performance towards As(III) detection in near-neutral conditions (0.1 M phosphate buffer solution (PBS), pH: 5.0). A high sensitivity of 1.366 μA·ppb −1 ·cm −2 with a low limit of detection of 0.30 ppb (S/N = 3) was achieved at concentrations ranging from 1.0 ppb to 260 ppb. Moreover, the prepared ZnO/NPG microelectrode was successfully applied in the analysis of As(III) in tap and lake water samples with satisfactory recovery rates. The ZnO/NPG microelectrode presented exciting prospects for the electrochemical analysis of As(III) in near-neutral conditions.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 4
·047514
·
IF 3.721
Yanyan Liu,Ruirui Xie,Peipei Yang,Ling Lu,Lin Shen,Jia Tao,Zhi Liu,Peng Zhao
Quercetin is one of the most important nutrients in human daily diet, the accurate and efficient analytical approaches for quercetin is highly required as it's closely related to many biological activities. In this paper, the three-dimensional highly porous gold film (hp-Au) modified gold electrode (Au) was prepared by a facile two steps self-templating method, it was found that hp-Au possess high surface-to-volume ratio and excellent conductivity. Combining with the multiple merits of hp-Au, the hp-Au/Au showed an excellent detection performance towards quercetin compared with bare electrode and Au nanoparticles modified gold electrode (AuNPs/Au), the detection limit was 3.9 nM in a wide concentration range from 20 nM to 100 μM. Meantime hp-Au/Au also showed decent stability, satisfied selectivity and desirable reproducibility. Moreover, the practical application of this sensor was verified by detecting QR in drink or food and medicine samples and the satisfactory recoveries of 97.43% to 101.59% and low RSD value (n = 3) no more than 3% were obtained.
研究领域:
分析化学
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食品科学
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药物分析
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DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2015
·
IF 4.513
Ye Zhu,Chuqing Zhou,Xupeng Yan,Yan Yan,Qiang Wang
In the present work, a highly sensitive and selective biosensor based on aptamer-functionalized nanoporous gold film (NPGF) was successfully developed for direct electrochemical detection of bisphenol A (BPA). NPGF was prepared by dealloying Ag from Au/Ag alloy leaf in concentrated nitric acid. The obtained NPGF was attached onto glassy carbon electrode and then was functionalized with BPA-specific aptamer via the formation of Au S bond. The fabrication of the sensor was characterized by scanning electron microscopy and X-ray photoelectron spectroscopy. NPGF exhibited excellent electrocatalytic activity towards the redox reaction of BPA, which ensured high sensitivity of the sensor. The aptamer-captured BPA showed a pair of redox peaks around 0.35/0.28 V (vs. Ag/AgCl). The experimental parameters in terms of aptamer concentration, reaction time, pH, and temperature were optimized. The calibration plot showed a linear range from 0.1 nM to 100 nM BPA with a remarkable detection limit of 0.056 ± 0.004 nM BPA. Particularly, the successful application of the developed sensor for the detection of BPA in human serum samples suggests its promising potential for clinical diagnosis.
研究领域:
分析化学
·
生物传感器
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2023
·
IF 6.2
Zhihong Wang,Minghao Shang,Honglei Chen,Tiexin Sun,Bohao Zhang,Yaohui Zhang,Kongfa Chen,Zhe Lv
Nanoporous metals with high specific surface area, excellent conductivity, and unique surface structure have attracted attention in a variety of applications such as catalysis, energy storage, and sensing. However, there is a significant challenge for the fabrication of uniform nanoporous architectures in metals through a simple and cost-effective process. In this study, we report a facile approach to create monolithic nanoporous Ag (MNPA) from the direct reduction of insoluble Ag 2 O precursor in an aqueous solution, fundamentally avoiding the introduction of secondary components and complex preparation of precursors. The formation of porous structures is attributed not only to the volume shrinkage but also to the spontaneous reconstruction of reserved Ag atoms during the reduction process. Furthermore, for a typical application, the optimized MNPA with a small grain size (∼113 nm) is used as a surface-enhanced Raman scattering (SERS) substrate, which exhibits ultrahigh SERS sensitivity with an enhancement factor of ∼10 9 .
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROANALYSIS
·
2024
·
IF 2.7
Xiaolei Wang,Xiaoyan Qi,Ruijun Liu,Ting Cai,Zihan Huang,Sen Wang,Xia Wang
Given the increasing food safety problems caused by sulfide and sulfite, there is an urgent need to develop a rapid and accurate method for the detection of sulfide and sulfite in food. In this study, a multianalyte electrochemical sensor was successfully fabricated based on glassy carbon electrode (GCE) modified by nanoporous gold (NPG) for the detection of sulfide and sulfite. Owing to the exceptional oxidation activity of NPG towards sulfite and sulfide, the constructed multianalyte NPG/GCE electrochemical sensor achieved highly sensitive detection of sulfide in the concentration range of 50 μM–5 mM with a sensitivity of 21.33 μA mM −1 cm −2 and a limit of detection (LOD) as low as 37.53 μM. For the detection of sulfite, the multianalyte NPG/GCE electrochemical sensor exhibited good linearity in the concentration range of 50 μM–5 mM with a sensitivity of 71.76 μA mM −1 cm −2 and a LOD of 5.12 μM. In addition, the multianalyte NPG/GCE electrochemical sensor realized the reliable detection of sulfide and sulfite in complex real food samples (such as milk, pickles, red wine, and tap water) with high sensitivity and anti-interference ability. The multianalyte NPG/GCE electrochemical sensor exhibited many advantageous properties in practical applications, including easy fabrication, sensitivity, rapidity, cost-efficient, and flexible adaptability, which made it a promising candidate for the rapid and reliable detection of sulfide and sulfite in food.
研究领域:
分析化学
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食品安全
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Huimin Wang,Xueli Zhang,Shuangjue Wang,Sa Xiao,Hanyue Ma,Xia Wang
Vitamin B 2 (VB 2 ) and vitamin B 6 (VB 6 ) as important vitamins for human health are mainly produced by industrial microorganism fermentation. Due to the complexity of fermentation system, there is a lack of an efficient, rapid, and convenient detection method in the fermentation production of these two vitamins. In this study, a multianalyte electrochemical electrode based on glassy carbon electrode (GCE) modified by nanoporous gold (NPG) film was developed. This is the first time that NPG realized the electrochemical detection of VB 2 and VB 6 in complex fermentation analysis. Under optimized conditions, the NPG-modified electrode exhibited good performance in VB 2 and VB 6 detection using differential pulse voltammetry (DPV). Two linear responses in wide concentration ranges for VB 2 from 5 to 250 μM and for VB 6 from 40 to 1000 μM were obtained with the limit of detection (LOD) of 0.1 μM and 0.4 μM as well as the high sensitivities of 178.02 μA mM −1 cm −2 and 43.14 μA mM −1 cm −2 , respectively. Furthermore, the detection of VB 2 and VB 6 in fermentation media was successfully achieved using the NPG-modified electrode with high sensitivity and strong anti-interference ability. Additionally, the NPG-modified electrode has a long life because of the metal characteristics of NPG. These above characteristics conformed that the multianalyte electrochemical electrode can realize the simultaneous detection of multiple substances such as substrates and products in a complex biosystem.
研究领域:
生物工程
·
分析化学
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2020
·
IF 6.306
Yiwei Xu,Wen Zhang,Jiyong Shi,Zhihua Li,Xiaowei Huang,Xiaobo Zou,Weilong Tan,Xinai Zhang,Xuetao Hu,Xin Wang,Chao Liu
A novel electrochemical aptasensor modified with highly porous gold and aptamer was prepared for the determination of acetamiprid in fruits and vegetables. Highly porous gold was synthesized by electroreduction at −4 V in an electrolyte containing 2.5 mol/L NH 4 Cl and 10 mmol/L HAuCl 4 . Acetamiprid-binding aptamer was immobilized on highly porous gold by self-assembly. Acetamiprid could be captured by aptamer on the sensing interface, resulting in an increment of electron transfer resistance. Thanks to the large specific surface area of highly porous gold and the high affinity of aptamer, the aptasensor exhibited a highly sensitive impedance response for acetamiprid. Under optimal condition, the aptasensor displayed a linear response for acetamiprid in the concentration range of 0.5–300 nmol/L, and the detection limit was 0.34 nmol/L. Furthermore, the aptasensor showed high selectivity, good reproducibility and stability. Finally, the aptasensor was applied for the determination of acetamiprid in fruits and vegetables with satisfactory results.
研究领域:
分析化学
·
食品科学
✓ 已验证
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2018
·
IF 3.649
Cheng Wang,Xinwei Liu,Wei Li,Xin Huang,Sen Luan,Xiaojian Hou,Mengnan Zhang,Qian Wang
Hierarchically porous metal-organic frameworks with micropores, mesopores , and macropores have been successfully fabricated by using compressed CO 2 . Not any acid or addition but compressed CO 2 was added into the synthesis system for achieving hierarchically porous materials. TEM , SEM, N 2 adsorption, XRD , TG, FTIR, and EDX were employed to character structural and component of the obtained materials. The mesopores size of resultant MOFs prepared by this approach can be expanded as large as 28 nm, which is rather difficult to obtain by conventional syntheses method. In addition, the amount and proportion of micropores, mesopores, and macropores distributed in the obtained samples can be controlled by adjusting CO 2 pressure. Furthermore, the resulting hierarchically porous MOFs (HP-MOFs) can be utilized to absorb selectively on CO 2 and CH 4 , which demonstrate the enhanced adsorption behavior. The liquid phase adsorption performances of the as-prepared HP-MOFs samples are evaluated by using methylene blue as a model adsorbate. The possible mechanism of formation of HP-MOFs by using compressed CO 2 was proposed according to results of the experiments. Compared with traditional synthetic methods, the compressed CO 2 plays many roles in the synthesis of HP-MOFs. Notably, this versatile approach can be applied to prepare other hierarchically porous materials in the organic solvent–water miscible system.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
OPTICS EXPRESS
·
2017
·Vol. 25
·期 9
·9901-9910
·
IF 3.307
Chao Chen,Ling Zhang,Min Yang,Chunxian Tao,Zhaoxia Han,Bin Chen,Heping Zeng
Nanoporous gold (NPG) has been reported to provide remarkable fluorescence enhancement of adjacent fluorophores due to the metal-enhanced fluorescence phenomenon (MEF), and the enhancement is related with the characteristic length of nanoporosity. To fully understand the effect of NPG on nearby fluorophores, it is desirable to study systems with well-defined metal-fluorophore distances. In this study we investigated the distance effect by using silica as the spacing layer between fluorophores and NPG. Originating from competition between plasmonic amplifying and metallic quenching, the dye molecule rhodamine 6G was best enhanced by 20-nm SiO2 coated nanoporous gold with the pore size of 36 nm, while the protein phycoerythrin was best enhanced by 15-nm SiO2 coated nanoporous gold with the pore size of 42 nm and the quantum dots were best enhanced by 20-nm SiO2 coated nanoporous gold with the pore size of 42 nm.
研究领域:
材料科学
·
光学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 11
·2927
·
IF 5.076
Lianmin Cui,Ling Zhang,Heping Zeng
Fluorescence resonance energy transfers (FRET) between cyan fluorescent protein (CFP) and yellow fluorescent protein (YFP) on nanoporous gold (NPG) are systematically investigated by controlling the distance between NPG and fluorescent proteins with polyelectrolyte multilayers. The FRET between CFP and YFP is significantly enhanced by NPG, and the maximum enhancement is related to both ligament size of NPG and the distance between NPG and proteins. With the optimized distance, 18-fold FRET enhancement was obtained on NPG compared to that on glass, and the conversion efficiency is about 90%. The potential to tune the characteristic energy transfer distance has implications for applications in nanophotonic devices and provides a possible way to design sensors and light energy converters.Keywords:FRET;plasmon;nanoporous gold;fluorescence enhancement;protein
研究领域:
光学
·
材料科学
·
纳米技术
·
生物物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
·
2024
·
IF 5
Chao Chang,Bo Li,Baocai Fu,Xu Yang,Tianyi Lou,Yulong Ji
As the global economy steadily develops and the rapid growth in industrialization increases, the world is gradually moving towards a serious energy crisis, and finding effective energy utilization methods becomes a consensus. Phase change materials (PCMs) have a wide range of applications in thermal energy storage due to their advantages of high thermal storage density, good cyclic performance, low cost, and environmental friendliness. In this work, the phase change process of the paraffin in uniform and gradient porous metal structures is investigated by simulation and experiments. Thermal storage units combined with paraffin and porous metal structures are designed and fabricated by metal 3D printing technology. A numerical model is established to explore the influence of the gradient porosity and heating source location on the melting process of the paraffin within different thermal storage units. To verify the correctness of the numerical model, visualization experiments are carried out to observe the phase change process of the paraffin. Both the simulated and experimental results demonstrate that the gradient porosity and heating source position greatly influence the paraffin's melting behavior in the porous metal structure. Compared to the uniform porous metal structure, the melting time of the paraffin in the gradient porous metal structure under the bottom and left heating mode can be shortened by 11.26% and 6.21%, respectively. The findings of this study are of considerable scientific and technological interest for developing and optimizing composite phase change thermal storage materials.
研究领域:
能源科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）