AUSTRALIAN JOURNAL OF CHEMISTRY
·
2018
·Vol. 71
·期 12
·965-970
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IF 1.059
Lingfeng Ruan,Rongying Jiang,Jing Liu,Song Liu
BaTiO3/TiO2 and CaTiO3/TiO2 bilayer-type photocatalyst films have been prepared and characterised by X-ray diffraction, Raman, X-ray photoelectron spectroscopy, UV-vis, and scanning electron microscopy techniques. The photodeposition of silver was done to confirm the reduction positions of the titanate/TiO2 films. Silver deposited preferentially on the side of TiO2 for BaTiO3/TiO2 whereas on the side of CaTiO3 for CaTiO3/TiO2. These results imply that the direction of photogenerated electron transfer is coincident with the semiconductor physical principles. Upon exposure to light, electron–hole pairs are generated and subsequently separated by an internal electrostatic field in the titanate–TiO2 heterojunction.
研究领域:
材料科学
·
物理化学
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DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Xingping Zhang,Bin Qiao,Yansong Li,Yu Zhou,Hualin Yang
Fluorene, a kind of polycyclic aromatic hydrocarbons (PAHs), was harmful to human health. In this work, a multi-wavelength and multicolor immunoassay was established for detecting fluorene based on the gold nanorods (AuNRs) growth. In the target recognition, fluorene was recognized by monoclonal antibody (McAb) through a competitive immune response. Then, the alkaline phosphatase-labeled Goat anti-Mouse IgG (ALP-IgG) as secondary antibody was used to combine with McAb. In signal output, ALP-IgG was used to catalyze 4-aminophenylphosphate to 4-aminophenol which can reduce Ag(I) to Ag(0). Then, the Ag(0) can deposit on the surface of AuNRs to cause the AuNRs growth. Along with the AuNRs growth, the absorption wavelength of the AuNRs was blue shifted and the color changed accordingly. The linear range of this immunoassay for fluorene was 0.063–4.000 ng/mL with the limit of detection (LOD) of 0.035 ng/mL. This immunoassay had excellent selectivity for fluorene according to the fact that it can distinguish fluorene among 16 PAHs. Meanwhile, this proposed immunoassay had a potential to detect fluorene in different water samples with satisfactory recovery rates (83 %–96 %).
研究领域:
分析化学
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环境科学
·
生物技术
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DOI
高影响因子
TALANTA
·
2023
·
IF 6.1
Yaqi Hu,Fang Bao,Siyuan Fu,Shiyuan Feng,Jinfeng Miao,Peng Miao,Yuanyuan Xu
Coronaviruses are highly infectious and pose a serious threat to human and animal healths. In this work, a facile electrochemical method based on Exonuclease III (Exo III) catalyzed digestion and silver deposition is developed for coronavirus RNA analysis. A magnetic separation procedure is performed to specifically identify target sequence and release single-stranded DNA modified gold nanoparticles (AuNPs). The nanoparticles can thus be immobilized at a screen-printed electrode and catalyze silver deposition for signal readout. This method allows sensitive analysis of PEDV and SARS-CoV-2 RNAs in the concentration range from 1 to 1000 nM with the limits of detection as low as 0.47 nM and 0.17 nM, respectively. Good specificities are demonstrated. Thus, the proposed method may have great potential use in the applications of coronaviruses analysis.
研究领域:
生物医学工程
·
分子生物学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Congqing Yang,Chao Gao,Hu Li,Mingxi Pan,Hui Huang
Silver-coated aluminum powder (Al/Ag) are anticipated to replace Ag powder in industrial production. However, the high activity of Al powder and insufficient understanding of the Ag deposition mechanism pose challenges in effectively controlling the Ag deposition process and morphology, thereby restricting which its applications. In this article, a diffusion-deposition competition mechanism is proposed to explain the growth path of Ag atoms on Al surfaces. This mechanism posits that the growth pathway of Ag atom is governed by the ratio between the surface diffusion rate and the deposition rate (V diffusion /V deposition ). Specifically, when surface diffusion dominates (V diffusion /V deposition ≫1), Ag atoms form a conformal layer, whereas the deposition-controlled (V diffusion /V deposition < 1 or V diffusion /V deposition ≪1), Ag atoms tend to form chains or clusters. Surface diffusion must be considered in regulation crystal growth process. By understanding this mechanism, Ag/Al particles with excellent electromagnetic wave (EMW) absorption properties (RL min = −37.8 dB, EAB max = 4.4 GHz) can be prepared simply by controlling only the experimental conditions that affect the surface diffusion and deposition rates. The insights gained from the proposed mechanism offer new ideas for the preparation of other noble metals or inorganic materials.
研究领域:
材料科学
·
化学工程
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高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Xiuquan Xu,Songmei Wang,Xiaofeng Yu,Jila Dawa,Dongliang Gui,Ronghui Tang
Photocatalytic inactivation has been proved to be an effective strategy for controlling biohazards. Herein, the novel Ag deposited phosphorus and sulfur co-doped g-C 3 N 4 (PSCN) composites with different Ag content were constructed via a facile calcination combining with biogenic-reduction method for inactivating Escherichia coli ( E. coli ). The detailed characterization results indicated that P and S elements were successfully co-doped into g-C 3 N 4 (CN) lattice and Ag nanoparticles (NPs) were evenly deposited on the surface of PSCN with diameter range of 4–20 nm. The Ag/PSCN at depositing amount of 4 wt% (Ag/PSCN-4) achieved the strongest photocatalytic inactivation along with excellent stability, which could completely inactivate 7.0 log cells of E. coli within 60 min of visible light irradiation. This improved bactericidal performance was mainly attributed to the synergistic effects of P-S co-doped together with Ag deposition, which resulted in the increased visible light utilization, the improved separation and transfer efficiency of photo-induced charge carriers. Moreover, active species trapping experiments revealed that the generated superoxide radicals ( O 2 − ) and holes (h + ) played the significant roles in photocatalytic inactivation process. Our present work presented a promising and environmentally friendly strategy to enhance the photocatalytic capacities of CN based composites for pathogens inactivation.
研究领域:
环境科学
·
微生物学
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材料科学
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Liying Qian,Duoduo He,Xiuhua Cao,Jun Huang,Junrong Li
Conductive fabric combines many advantages of fabric including durability, flexibility, and comfort, and has broad prospects in the field of wearable electronics. A multilayer silver deposition fabric with ultrahigh washability is prepared by combining 3 -mercaptopropytrimethoxysilane (MPTS) and N -acetyl- L -cysteine (NAC) in the fabrication process. Silver particles were deposited on polyester fabric (PETF) by electroless plating with glucose as a reducing agent. MPTS is grafted on PETF by condensation reaction to ensure that the first layer of silver is firmly deposited on the fabric. NAC with sulfhydryl and carboxyl groups is used as the binder between the next silver layers. NAC treatment of silver-plated fabric can not only eliminate the loosely attached silver particles on the fabric, but also increase the adhesion between the silver layers by sulfhydryl and carboxyl groups. The electrical resistance of the two-layer silver plated fabric (Ag 2 /M-PETF) is as low as 0.016 Ω sq −1 , which is only 2.06 Ω sq −1 after 500 washing cycles and 0.068 Ω sq −1 after 1000 friction cycles. Ag 2 /M-PETF also shows good hydrophobicity , mechanical properties and thermal stability.
研究领域:
材料科学
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纺织工程
·
可穿戴电子技术
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DOI
高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 10
·1-9
·
IF 6.232
Liu Hui,Liu Bowen,Huang Pengcheng,Wu Yangyang,Wu Fang-Ying,Ma Lihua
Gold nanoparticles (AuNPs) catalyze the mild reaction between the weak reducing agent kojic acid (KA) and silver ions (Ag + ) to form Au@Ag bimetallic NPs by the combination of the intrinsic catalysis with plasmonic properties This is proposed as a novel optical assay to determine the tyrosinase (TYRase) concentration. The nanoparticles have been characterized by UV-vis spectroscopy, transmission electron microscope (TEM) images, and X-ray photoelectron spectroscopy (XPS). The sensing mechanism is based on the fact that KA binds to TYRase by chelating with dicopper active site of TYRase and the introduction of TYRase restrains the Au@Ag bimetallic NP formation by the precedent binding with KA. A clear color variation from yellow to pink and UV-vis spectral changes are observed at the optimal wavelength of 410 nm. The assay works in the range 0.13~0.73 U mL −1 with a detection limit (LOD) of 0.019 U mL −1 . The impact from matrix interfering substances including glucose, uric acid, common oxidases, and amino acids is negligible. The applicability is demonstrated by quantitative determination of TYRase in human serum samples with 74 to 89% recovery and RSD less than 4.0%, which accords with the level for bio-sample analysis.
Schematic presentation of colorimetric assay for tyrosinase (TYRase) based on the inhibition effect on silver deposition onto catalytically active gold nanoparticles (AuNPs) and its application with a smartphone. Tyrosinase (TYRase); silver ions (Ag + ); kojic acid (KA); gold nanoparticles (AuNPs); gold-silver core-shell nanoparticles (Au@Ag NPs)
研究领域:
生物化学
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医学诊断
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纳米技术
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2025
·
IF 2.9
He Yong,Lin Wensong,Gao Ran,Zhang Yeheng,Lin Huanxia
Bi 5 O 7 I was considered as a promising photocatalyst due to its unique structure. However, the recombination rate of electron–hole pairs generated by Bi 5 O 7 I is too fast, making it impossible for practical applications. In this study, Bi 5 O 7 I catalysts deposited with various amount of silver were manufactured and their photocatalytic efficiency for rhodamine B (RhB) was measured. It was found that Bi 5 O 7 I with a silver deposition of 15% (named as Bi 5 O 7 I/Ag-15) exhibits the highest catalytic performance, with a degradation rate of 97.34% for RhB after illumination for 90 min. The cyclic test results confirmed that Bi 5 O 7 I/Ag-15 still maintained high photocatalytic activity after six cycles of degradation. In addition, Bi 5 O 7 I/Ag-15 also exhibits an excellent photocatalytic performance in acidic or alkaline environments, indicating its potential for practical applications. A reasonable degradation mechanism for RhB photocatalysis was then proposed. Graphical abstract
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2016
·
IF 5.886
Tianran Lin,Yarong Wu,Zhihong Li,Zhiping Song,Liangqia Guo,Fengfu Fu
Colorimetric detection of biogenic amines, well-known indicators of food spoilage, plays an important role for monitoring of food safety. However, common colorimetric sensors for biogenic amines suffer from low color resolution or complicated design and intricate output for the end-users. Herein, we explored a simple but effective strategy for visual monitoring of biogenic amines with multiple color change based on hydrolysis-induced silver metallization reaction to tune the localized surface plasmon resonance (LSPR) adsorption of Au nanorods (NRs). The color change and blue shift of longitudinal LSPR peak of Au NRs were closely related to the concentration of biogenic amines. This strategy provided a simple, sensitive, robust, nondestructive, cost-effective, and user-friendly platform for in situ evaluating the freshness of foodstuffs.
研究领域:
食品安全
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纳米技术
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分析化学
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DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2018
·
IF 4.514
Linlin Ren,Qiang Li,Jibao Lu,Xiaoliang Zeng,Rong Sun,Jianbo Wu,Jian-Bin Xu,Ching-Ping Wong
Polymer composites with high thermal conductivity have a great potential application in modern electronics, due to their light-weight, easy process, low cost and stable physical and chemical properties. Nevertheless, most polymer composites commonly possess unsatisfactory thermal conductivity, primarily because of the high interfacial thermal resistance between inorganic fillers. Herein, we report a novel method through silver-deposition on the surface of the fillers to create a silver nanoparticle “bridge”, to decrease the interfacial thermal resistance between fillers. The results demonstrate that the out-of-plane thermal conductivity of the epoxy resin/sphere alumina composites is increased to 1.304 W m −1 K −1 , representing an improvement of 624% compared with pure epoxy resin. This strategy provides an insight for the design of thermally conductive polymer composites with potential to be used in next-generation electronic packaging.
研究领域:
材料科学
·
热传导工程
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DOI
高影响因子
JOURNAL OF ANALYTICAL CHEMISTRY
·
2020
·Vol. 75
·期 6
·812-819
·
IF 0.84
Chuan-Hua Zhou,Li Xiang,Zi Qin-Jiang,Wang Jin,Zhao Wen-Ying,Cao Qiu-E
Abstract A highly sensitive enzyme-induced metallization-based electrochemical signal amplification strategy was developed based on the integration of the enzyme-induced metallization reaction, Au nanoparticles ( AuNPs )-induced silver deposition, chemically modified electrode and highly sensitive stripping voltammetry detection. The presence of alkaline phosphatase ( ALP ) catalyzed ascorbic acid 2-phosphate into ascorbic acid, which reduced Ag + to Ag 0 on the surface of the AuNPs/multi-walled carbon nanotubes/polyethyleneimine/glassy carbon electrode ( AuNPs/MWNTs/PEI/GCE ). As a result, the enzyme-generated product was accumulated on the surface of the AuNPs/MWNTs/PEI/GCE by means of silver deposition via this signal amplification strategy, which enhanced the detection signal dramatically. Amounts as low as 1 × 10 –8 U/mL (corresponding to 10 aM) ALP can be detected using this strategy, which is about 4−7 orders of magnitude more sensitive than with other reported methods for ALP determination. In addition, this strategy can be applied to ALP detection in real complex samples, which shows great potential in the early diagnosis of diseases.
研究领域:
生物化学
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医学诊断
·
分析化学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Duoduo He,Liying Qian,Xingyu Chen,Beihai He,Junrong Li
Electromagnetic interference (EMI) shielding paper with durability and high effectiveness is of significant importance to long-term service for preventing EMI pollution. Herein, we report a practical method for preparing cellulose paper/Ag composite with outstanding durable and ultrahigh EMI shielding performance by electroless silver plating. The silver deposition process, the surface morphology, the silver content and conductivity of the composite can be controlled by varying the amount of N -acetyl-L-cysteine (NAC) grafted onto the cellulose fibers and ammonia amount for silver-ammonia complex formation. Moreover, the grafted NAC with thiol groups on cellulose can enhance the adhesion between silver and cellulose paper, meanwhile, NAC as the reducing agent can result in a more complete flower-shaped silver structure and reducing the reflection of electromagnetic waves in silver layer. The composite exhibited excellent conductivity, EMI shielding effectiveness (SE) up to 106 dB and outstanding durability. After 10,000 bending times and 60 abrasion cycles respectively, the electrical resistance of the composite only increased from 0.030 Ω/sq. to 0.041 Ω/sq. and 0.050 Ω/sq., and the EMI SE decreased to 102 dB and 105 dB.
研究领域:
材料科学
·
化学工程
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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）