ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
Yue Wang,Yingjie Zhao,Yingfei Ma,Dengchao Wang
Carbon nanopipettes (CNPs) have attracted much attention in nanoscale electrochemical applications recently, while the carbon structure and surface oxygen-containing groups limit its applications. Herein, we grow the carbon nanotubes (CNTs) inside the quartz nanopipet via the chemical vapor deposition method, and the fabricated carbon nanotube nanopipettes (CNT-NPs) exhibit better electrochemical responses toward biomolecules such as glutathione and ascorbic acid, compared to the conventional CNPs. In addition, the carbon nanopipette can also be easily doped by a chemical reaction with urea, to display positive surface charges and high electrochemical activity for H2O2 oxidation/reduction. This work provides an easy way to tailor the surface structure and charges of the deposited carbon inside the pipettes and thus would further promote its broader usage in electrochemical sensing applications in biological fields.
研究领域:
纳米技术
·
生物医学工程
·
电化学传感
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ORGANOMETALLIC CHEMISTRY
·
2018
·
IF 1.946
Amin Khan,Li Wang,Haojie Yu,Muhammad Haroon,Raja Summe Ullah,Ahsan Nazir,Tarig Elshaarani,Muhammad Usman,Shah Fahad,Kaleem-ur-Rehman Naveed
Three novel polymers (P(FHEMA- co -MAAT)s) having redox and photoresponsive moieties were prepared by free radical polymerization . The structures and molecular weights of the synthesized copolymers were characterized by nuclear magnetic resonance ( 1 H NMR) and gel permeation chromatography (GPC) respectively. Thermal properties, optical features and electroactive properties were studied with the help of thermogravimetric (TG), differential thermogravimetric (DTG) analysis, ultraviolet-visible spectroscopy (UV-vis) and cyclic voltammetry (CV). It was seen that synthesized copolymers had excellent redox and photoresponsive properties. These results exhibited that these polymers can be applied further for redox/photo responsive information storage devices.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 5
·1-7
·
IF 5.833
Lin Zhenfeng,Liu Xin,Li Yangzi,Li Changxiang,Yang Liu,Ma Keke,Zhang Zhenwei,Huang Huayu
Two-dimensional Mo 2 C/Mo 2 N composites were synthesized by high temperature ball milling and used as support materials for fabricating a chlorpyrifos (CPF) aptasensor. Gold nanoparticles (Au NPs) were electrodeposited on the surface of a Mo 2 C/Mo 2 N-modified electrode to connect with the ferrocene (Fc) probe via Au–S bonds. The Fc probe can hybridize with the aptamer probe to form a double-stranded structure. The addition of CPF made the double strands melt and the Fc probe approached the surface of the electrode, thereby resulting in amplification of the electrochemical response. The current response of the aptasensor for detecting CPF in solutions linearly varied from 0 to 400 ng mL −1 (with a maximum at 0.98 V vs. Ag/AgCl). The Au NPs/Mo 2 C/Mo 2 N composites exhibited satisfactory electrochemical behavior due to their excellent electrical conductivity and large surface area. This ultrasensitive aptasensor showed a low limit of detection of 0.036 ng mL −1 . It was applied to determine CPF in real samples with acceptable recoveries from 94.7 to 116.7%, and the relative standard deviation was from 2.57 to 7.08%. Graphical abstract
Schematic diagram of the manufacturing process of the aptasensor. Electrochemical aptasensor based on Mo 2 C/Mo 2 N/Au NP composites show excellent performance in detecting CPF.
研究领域:
分析化学
·
环境科学
·
农业科学
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产品关联
DOI
PubMed
高影响因子
POLYHEDRON
·
2019
·
IF 2.284
Guo-Cheng Liu,Yan Li,Zhen-Jie Lu,Xiu-Li Wang,Xiang Wang,Xing-Xing Chen
By introducing different metal ions, six new coordination polymers (CPs) [Zn(L) 0.5 (DTSA)]·H 2 O ( CP1 ), [Cd(L) 0.5 (DTSA)(H 2 O)] ( CP2 ), [Mn(L) 0.5 (DTSA)(H 2 O)] ( CP3 ), [Co(L) 0.5 (DTSA)(H 2 O)] ( CP4 ), [Ni(L) 0.5 (DTSA)(H 2 O)] ( CP5 ), [Pb 2 (L) 0.5 (DTSA) 2 ] ( CP6 ), [ N , N ′-bis(4-methylenepyridin-4-yl)-1,4-benzenedicarboxamide (L), 2,2′-dithiodibenzoic acid (H 2 DTSA)] have been synthesized under hydrothermal conditions. CP1 is a unified node (4,4)-connected network derived from Zn 2 nodes, pairs of DTSA anions and μ 2 -L linkers. CP2 – CP5 display similar binode (4,4)-connected layers based on single metal centers, μ 2 -DTSA anions and μ 4 -L linkers. CP6 show a novel 3D (3,4,4,5)-connected Pb-based framework, which is constructed form Pb-DTSA layers and μ 4 -L linkers. The effect of metal ions on the architectures of the title complexes is investigated. The experimental results indicate that CP1 , CP2 and CP6 are efficient luminescent sensors for the detection of Fe 3+ ions ( CP1 and CP2 ) and dimethyl sulfoxide (DMSO) ( CP1 and CP6 ). In addition, CP3 – CP5 show different electrochemical response to nitrite and bromate in water solution.
研究领域:
化学
·
材料科学
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DOI
高影响因子
MICROCHIMICA ACTA
·
2015
·Vol. 183
·期 2
·689-696
·
IF 3.741
Wang Yanying,Liu Guishen,Hou Xiaodong,Huang Yina,Li Chunya,Wu Kangbing
Cysteine (Cys) was electrochemically deposited on a glassy carbon electrode (GCE) by cyclic voltammetry. The poly-Cys modified electrode was placed in a solution of gold nanorods (GNRs) to induced self-assembly of the GNRs. The GNRs/poly-Cys/GCEs were characterized by scanning electron microscopy and electrochemical impedance spectroscopy. A voltammetric study on tetrabromobisphenol A (TBBPA) with this GCE showed the current response to be enhanced by a factor of 11 compared to a non-modified GCE. Based on these findings, a square wave voltammetric assay was worked out. Under optimized conditions, a linear relationship between the oxidation peak current and TBBPA is found for the 10 nM to 10 μM concentration range. The detection limit is 3.2 nM (at an S/N ratio of 3). The electrode was successfully applied to the determination of TBBPA in spiked tap water and lake water samples.
Gold nanorods (GNRs) were assembled on the surface of a poly-L-cysteine film - modified glassy carbon electrode and used as a sensing interface for enhancing the voltammetric response towards tetrabromobisphenol A.
研究领域:
分析化学
·
环境科学
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产品关联
DOI
高影响因子
Small Methods
·
2023
·Vol. 7
·期 6
·2300302
·
IF 12.4
Ling Lei,Jiaxi Yin,Kangbing Wu,Nianjun Yang
2D MXenes are widely proved to be potential electrode materials, although the size effect on their electrochemistry is not fully understood. In this work, Ti 3 C 2 T x nanoflakes are prepared through acidic etching of Ti 3 AlC 2 powders, followed by the intercalation treatment with tetrapropylammonium hydroxide. Such a method produces large-scale delaminated and oxygenated nanoflakes. With aid of centrifugation, the nanoflakes with varied lateral sizes and thicknesses are collected, where electrochemical response of charged redox probes and polar phenol molecules is varied. Density functional theory and energy dispersive spectroscopy confirm such electrochemical response is dependent on the size and thickness of used nanoflakes, more exactly the oxygen content on their surface. Taking the nanoflakes obtained using a centrifugal speed of 5000 rpm (MX-TPA 0.2 ) as an example, they feature good dispersibility, a high oxygen content, a small size, and a thin thickness. On these nanoflakes electrochemical response of polar p -substituted phenols is pronounced, stemming from a strong electron-withdrawing interaction of their oxygenated termination with the Ar-OH. A sensitive electrochemical sensor is further constructed for the detection of p -nitrophenol. This work thus provides an approach to synthesize MXenes with different sizes and thicknesses as well as further to reveal size-dependent electrochemistry of MXenes.
研究领域:
材料科学
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电化学
·
纳米技术
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产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Yichang He,Yiquan Liao,Bin Zhang,Ruiqi Xu,Ye Ma,Minggang Zhao,Hongzhi Cui
Melamine added to milk powder can lead to kidney injury and even death, but rapid detection is still hard due to the strong interference of milk powder solution. Herein, the CC/CeO 2 /CNPs mesh was constructed to detect melamine by using the photo-enhanced barrier effects on electrochemical response. Schottky barrier was regulated effectively to produce electrochemical response to melamine by photo-induced electrostatic interaction, which exhibited strong resistance to interference in milk powder solution. Sensitivity was enhanced by nearly 5 times and the lowest detection limit was reduced as low as 0.274 nM. The obtained high recovery (100%-104%) and good stability in milk powder solution indicated the good potential for practical applications. It provides a new opportunity for achieving strong resistance to interference by using the photo-enhanced barrier driving effect on electrochemical response.
研究领域:
分析化学
·
食品安全
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·Vol. 171
·期 8
·083508
·
IF 3.1
Xuan Dinh Ngo,Ngoc Huyen Nguyen,Thi Lan Huong Phung,Tuan Anh Nguyen,Nguyen Thanh Vinh,Quy Nguyen Van,Vinh Hoang Tran,Nhung Pham Tuyet,Anh-Tuan Le
In this study, we describe experimental efforts to decipher the role of ZnCo2O4 nanoflakes (ZCO-NFs) for selective enhancement of voltammetric responses of screen-printed electrode (SPE) toward redox species system. The ZCO-NFs sample was characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM) and UV–vis spectroscopy. The electrochemical characterization of bare SPE and modified SPE electrodes was investigated by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and Mott−Schottky analysis. A series of redox systems including paracetamol (PA), dopamine (DA), chloramphenicol (CAP), furazolidone (FZD), p-nitrophenol (p-NP), carbaryl (CBR), ofloxacin (OXF), and erythromycin (ERY) were selected to investigate for (i) reversible redox process, (ii) irreversible electrochemical oxidation process, and (iii) irreversible electrochemical reduction process on both bare-SPE and ZCO-NFs/SPE electrodes. The obtained results showed that ZCO-NFs possess the selective enhancement of electrochemical response for redox systems with an increase of 24%–90% for PAR, DA, FZD, CAP, and CBR and a decrease of 13%–49% for p-NP, ERY, and OFX. The different electrochemical response of redox species at nanostructured semiconductor electrodes is attributed to the contribution of both the adsorption capacity of redox species and the interfacial electron transfer process between electrode and redox species. An insight into the interfacial electron transfer kinetics and its contribution to the enhancement of electrochemical response on p-type semiconductor electrode is helpful in designing high-performance sensing platforms based on spinel oxide nanostructures.
研究领域:
材料科学
·
分析化学
·
电化学
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Yaohua Yang,Kai Yan,Jingdong Zhang
A Ni(OH) 2 /TiO 2 photoanode possessing high photoelectrocatalytic activity toward glucose oxidation driven by visible light was fabricated. The results indicated that deposition of Ni(OH) 2 on TiO 2 film electrode could remarkably promote the catalytic oxidation of glucose under visible light illumination. By applying a low voltage, the Ni(OH) 2 /TiO 2 electrode showed a linear photoelectrochemical response to glucose in the concentration range from 0.5 μM to 20 μM. Furthermore, the high photoelectrocatalytic activity of Ni(OH) 2 /TiO 2 electrode toward glucose oxidation was utilized to construct a glucose-air photofuel cell, which generated electrical signal responding to glucose concentration from 5 μM to 100 μM, without using external electrical power supply. Thus, dual non-enzymatic glucose sensors based on photocatalytic oxidation of glucose on the Ni(OH) 2 /TiO 2 electrode under visible light illumination were demonstrated.
研究领域:
生物医学工程
·
材料科学
·
分析化学
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DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Abdelfattah Amari,Basem Alalwan,Saifeldin M. Siddeeg,Mohamed A. Tahoon,Norah Salem Alsaiari,Faouzi Ben Rebah
Recently, carbon-doped nanomaterials attract attention due to their unconventional properties as doping completely changes their properties. Herein, we try to compare the electrochemical response of the prepared boron-doped graphene nanosheets and un-doped graphene nanosheets modified glassy carbon electrodes toward some interesting biomolecules like ascorbic acid, uric acid, and dopamine. There are significant differences of prepared doped and un-doped graphene nanosheets toward the mentioned biomolecules. The resistance of surfaces toward fouling was studied on uric acid oxidation product in the long term. In the long term stability of the prepared materials, there are no significant differences found. As electrochemical materials, the differences between prepared materials will affect their applications.
研究领域:
纳米材料科学
·
电化学
·
生物医学工程
·
分子传感
·
转化医学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 53
·期 3
·1945-1961
·
IF 2.599
Xu Jing-Wen,Cui Zhuo-Miao,Xu Feng,Luo Yan-Ling
Multi-component block copolymer nanohybrids consisting of Fe 3 O 4 nanoparticles and poly(acryloyloxyethyloxyl 1-mercaptohemisuccinate) and poly(methacrylic acid) (PMAA) blocks were synthesized via the surface-initiated atom transfer radical polymerization, followed by the esterification with d,l-mercaptosuccinic acid. The block copolymer nanohybrids were coordinated with Au nanoparticles (Au NPs) through pendent thiol groups to form Au NPs coordinated Fe 3 O 4 graft block copolymer nanohybrids. Fluorescent spectrometry, TEM and SEM findings indicated that these block copolymer nanohybrids could self-assembled and form globular core–shell nanomicelles, and their critical micelle concentrations decreased with the decrease in the length of PMAA chains and the incorporation of Au NPs. Zeta potential measurements signified that the copolymer nanohybrids possessed significantly high stability. DLS results indicated that hydrodynamic diameters of the copolymer nanohybrids distributed within the scope of 85–155 nm, hinging on the length of the graft chains and the complexation of Au NPs. The hybrid block copolymer nanomicelles exhibited pH, electrochemical and magnetic responsiveness, with pH transition points at 5.3–5.9. The incorporation and the loading percentage of Au NPs improved the reversibility of the electrochemical response and plasmon resonance. The block copolymer nanohybrids were superparamagnetic and were expected to broaden their applications by virtue of the multi-component combination and the resulting multifunctionality.
研究领域:
材料科学
·
纳米医学
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Jiandan Chen,Guangxian Liu,Qi Xiao,Chenwei Wang,Zhenzeng Zhou,Chunchuan Gu,Zheng-Zhi Yin,Hongying Liu
Glucose concentration in the body is a very important index for health evaluation. Nonenzymatic glucose biosensors attract persistent interest and research. The acupuncture technique has been developed for treating the disease for thousands of years. Here, a stainless-steel acupuncture needle (AN) was first used to sense glucose after functionalizing with bimetal of gold nanoparticles (AuNPs) and nickel nanoparticles (NiNPs). AuNPs were electrodeposited as particle clusters, and the NiNPs could be further electrodeposited around AuNPs to form a nano-pinecone shape with a size of about 600 nm. Au/AN exhibited the best electroconductivity compared to the weakest Ni/AN and medium Ni/Au/AN interfaces. Three nanotechnically processed interfaces showed obvious electrochemical response behavior for glucose compared with the bare AN. Surprisingly, the matrix of AuNPs could drastically boost the electrochemical response of NiNPs for glucose, which might be due to the abundance of active sites in the bimetallic hierarchy. The Ni/Au/AN electrode possessed an additive signal compared with Au/AN and Ni/AN. Under the optimized conditions, the prepared nonenzymatic biosensor exhibited two linear relationships in the wide concentration range of 0.5 μM to 1.5 mM and 1.5–5 mM with sensitivities of 766.02 and 368.77 (μA/mM/cm2), and the limit of detection was 0.14 μM. Moreover, the Ni/Au/AN showed superior performance over reported electrodes with great selectivity, stability, and reproducibility. The apparent Km of 0.161 mM was lower than that of glucose oxidase, implying that the Ni/Au-modified AN exhibited a strong affinity for glucose. The fabricated biosensor can be successfully used for the detection of glucose concentration in human serum, which provided a leading direction and potential for clinical point-of-care monitoring.
研究领域:
生物医学工程
·
材料科学
·
分析化学
✓ 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）