NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 27
·12759-12769
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IF 3.3
Yuheng Deng,Jie Zhao,Yaoguang Yu,Junhan Gao,Shifan Zhao,Jianying Yuan,Qingze Han,Guofeng Cui
In this study, we report a rapid and efficient strategy by cyclic square wave voltammetry (CSWV), a novel voltammetric technique, to detect dopamine (DA) and epinephrine (EP) separately and simultaneously with an unmodified graphene-based integrated electrode. The CSWV method, with high sensitivity and capability of mechanistic study, is achieved by controlling an inexpensive modified open-source potentiostat (MOSP) that has a superior performance comparable to commercial benchtop electrochemical workstations. Based on the different intramolecular cyclization reaction rates of DA and EP depending on pH, the concentration of DA could be derived from the cathodic peak at +0.12 V, and the concentration of EP could be calculated from the negative cathodic peak at −0.26 V. The CSW voltammogram presented that the linear range of both DA and EP was 5–70 μM, with a detection limit of 2.14 μM and 1.94 μM (S/N = 3) at neutral pH, respectively. In addition, the cathodic currents of CSWV were 12.68 and 10.72 times higher than those of cyclic voltammetry (CV) and 1.53 and 1.24 times higher than those of cathodic square wave voltammetry (cSWV). The proposed method showed a strong anti-interference capability and can be applied to detect DA and EP in the real sample (calf serum sample), with a recovery rate in the range of 100.05–108.25%. The introduced electrochemical determination method can provide a promising application prospect for point-of-care testing (POCT) of neurotransmitters.
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Journal of Physical Chemistry C
·
2023
·
IF 3.7
Longjian Li,Qinhua Zhang,Congcong Han,Xiaohui Sun,Tao Xing,Mingqing Wang,Mingbo Wu,Nopphon Weeranoppanant,Wenting Wu
Triplet photosensitizers have great potential in selective photooxidation by generating 1O2 through triplet energy transfer. However, the heterogeneous bulk photosensitizers easily trap triplet excitons and inhibit photocatalysis efficiency. Previous work focused on controlling ultra-small size to reduce the transfer distance, but we propose a new strategy using triplet acceptor molecules (e.g., pyrenecarboxylic acid, PCA) with proper energy levels to modify the surface of heterogeneous photosensitizers (e.g., g-C3N4), facilitate the transfer of triplet excitons from the interior to the surface of the catalyst, and enhance catalytic reactions on its surface. In the photooxidation reaction of uric acid (UA), the conversion of UA catalyzed by pg-C3N4/PCA can reach 91.3% at 60 min, higher than that without modification (24.0%). DFT calculations and spectroscopic characterization show that the triplet acceptor in pg-C3N4/PCA could reduce the ΔEST value and grab triplet excitons in g-C3N4, thereby enhancing the 1O2 generation. This work provides another approach for high-efficiency utilization of heterogeneous triplet photosensitizers in wide applications.
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IONICS
·
2023
·Vol. 29
·期 9
·3795-3803
·
IF 2.8
Xiong Qinghao,Wan Haifei,Peng Xia,Zhu Yongmei
N-rich carbon (C) microspheres loaded with Ni nanoparticle (NiNP) microspheres (Ni@N-doped C) were obtained by calcination of covalent organic framework (COF) LZU-1 with abundant N atoms/Ni 2+ . Lots of NiNPs with the size of 4 nm are arrayed uniformly and firmly into N-doped C microspheres derived from COF LZU-1 based on the strong coordination between N atoms on the wall of well-ordered pores and Ni atoms, which is more beneficial to rapid electron and mass transfer. The synergistic effect from N-doped C microspheres and small-sized NiNPs in Ni@N-doped C enhances catalytic activity of Ni@N-doped C microspheres greatly, which provides feasibility for the construction of non-enzymatic electrochemical sensor. The non-enzymatic electrochemical sensor based on Ni@N-doped C microspheres is applied to the detection of dopamine (DA) and shows good detection results with a low detection limit of 0.009 μM and a wide detection range of 0.027–70 μM. What is more, this DA sensor has good anti-interference, reproducibility, and stability, which provides new idea for the construction of non-enzymatic electrochemical sensor.
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Surfaces and Interfaces
·
2023
·
IF 6.2
Shengchen Ke,Linling Qin,Ruoxi Zhang,Weijian Zhu,Wenxiang Lu,Lu Ma,Shaolong Wu,Xiaofeng Li
It is of great importance to develop a non-invasive and portable glucose sensor to address challenges and obstacles brought by invasive glucose sensors, such as negative physical and psychological impacts to patients during the fingertip blood collection, limited environment of use for enzyme-based electrodes, and cumbersome active-driven integrated devices. Photoelectrochemical (PEC) sensors have great potential in this regard. In this work, self-driven and enzyme-free sweat glucose PEC sensing is realized by constructing TiO 2 hierarchical nanotubes modified by CuO nanoparticles (CuO@TiO 2 HNT). A sensitivity of 138.9 μA mM −1 cm −2 in the low concentration range (< 200 μM) and a detection limit of 0.7 μM (Signal/Noise=3) are achieved by the as-prepared CuO@TiO 2 HNT photoelectrode at relatively zero bias. The testing results for sweat glucose detection before and after meal consumption are consistent with those from commercial glucometers. The CuO@TiO 2 HNT photoelectrode works well at absolutely zero bias and in a wide temperature range (e.g., 0–60 °C). The extraordinary sensing performance can be mainly attributed to the following two factors: (1) the TiO 2 hierarchical nanotubes have an excellent light-capturing property and large specific surface area, and (2) the CuO nanoparticles substantially facilitate surface-carrier transfer for the glucose oxidation reaction. This work provides an enzyme-free sensing photoelectrode for self-driven sweat glucose detection and an alternative route to portable and noninvasive sensing of glucose.
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ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Hongying Liu,Cairui Zhang,Chenwei Wang,Kai Fan,Yuqing Zhang,Lu Fang,Lihua Li,Chaoxiang Ren,Zheng-Zhi Yin,Zhong Lü
Promethazine (PMZ) is an effective antihistamine that is used as a nerve tranquilizer to treat mental disorders. However, drug abuse causes harm to the human body and also pollutes the environment to a certain extent. Therefore, it is crucial to develop a highly selective and sensitive biosensor for PMZ determination. An acupuncture needle (AN) was used as an electrode in 2015, and further research on the electrode's essence in electrochemistry is needed. In this work, a sensor based on a surface imprinted film coordinated Au/Sn biometal was first fabricated on AN via electrochemistry. The obtained cavities showed complementary and suitable sites for “N atom” electron transfer through the phenyl ring structure in promethazine, which is rigorous for the configuration near the interface. Under the optimal conditions, MIP/Au/Sn/ANE exhibits a good linear relationship in the range of 0.5 μM–500 μM, and the detection limit (LOD) is 0.14 μM (S/N = 3). The sensor exhibits good repeatability, stability, and selectivity and can be successfully used to analyze and detect PMZ in human serum and environmental water. The findings are scientifically significant for AN electrochemistry and the sensors have potential for in vivo medicamentosus monitoring in the future.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Ruoxi Zhang,Shengchen Ke,Wenxiang Lu,Weijian Zhu,Lu Ma,Linling Qin,Shaolong Wu,Xiaofeng Li
Constructing novel heterojunctions has become an effective strategy to improve the performance of photoelectrochemical (PEC) biosensors, but most of the glucose-sensing photoelectrodes involve enzyme modification and disordered or semi-closed surface topography which restricts the working environment and sensing performance. Herein, the dense and burr-like CuO nanospikes (CuONSs) are grown on all over the whole surfaces of the relatively-sparse and ordered Si nanowires (SiNWs) by a combination of magnetron sputtering and hydrothermal growth. The optimized SiNWs-CuONSs heterojunction with a core–shell structure achieves the enzyme-free PEC detection of glucose with a sensitivity of 2324.09 μA mM −1 cm −2 in the concentration range of 0–1.0 mM and a detection limit of 0.74 μM (Signal/Noise = 3). The excellent sensing performance is ascribed to that (1) the SiNWs with a large specific surface area acting as host have open-style surface topography, ensuring the analyte flowability; (2) the CuONSs with a desired glucose-catalytic activity are hierarchical, providing a great number of active sites; and (3) the SiNWs-CuONSs heterojunction has a satisfactory optical absorption and a high efficiency of the photogenerated-hole transfer. This work demonstrates that the enzyme-free and highly-sensitive glucose detection can be realized by morphology-controllable heterojunction, and provides an alternative route to noninvasive sensing.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Hong-Wei Lv,Quan-Fu Li,Hui-Ling Peng
Sodium tetrafluorocuprate (Na 2 CuF 4 ) has been synthesized by the precipitation method. Then, Na 2 CuF 4 was applied to glucose electrocatalysis for the first time, and modified bare Au electrode to obtain Na 2 CuF 4 /Au. Na 2 CuF 4 /Au has strong anti-interference, extremely broad linear range of glucose detection, and great stability through stored for a long time at room temperature. A simple method was used to prepare Na 2 CuF 4 with different morphologies, and the effects of different morphologies for the glucose sensing performance were studied. The optimal experimental parameters of glucose sensing were obtained through parameter optimization, which leads to enhanced glucose sensing performance. The selected Na 2 CuF 4 was composed of large crystals and smaller crystals. The larger crystals sizes of selected Na 2 CuF 4 are in the range from 5 μm to 6 μm, and the smaller are in the range from 230 nm to 300 nm, the two are mixed together. The Na 2 CuF 4 /Au electrode showed high sensitivity and very wide linear range (the first 0.01-0.15 mM, the second 0.15-19.15 mM, the third 19.15-63.15 mM). The Na 2 CuF 4 /Au shows good accuracy, reproducibility and stability, as well as excellent selectivity. The properties of Na 2 CuF 4 indicate that it has a wide application prospect in the field of glucose electrocatalysis as a new glucose sensitive material.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Muyi Li,Xiang Yang,Wenjun Liu,Huixian Wang,Hongmei Jiang,Xiaoying Liu
An ultrasensitive electrochemical sensing platform based on a glassy carbon electrode (GCE) modified with electrochemically reduced graphene oxide (erGO) and gold nanoparticles@carbon dots (GNPs@CDs) was developed. The hydroxyl-rich CDs were electrochemically synthesized, and the GNPs@CDs were obtained by reducing chloroauric acid with hydroxyl-rich CDs. The electrochemical behavior of the fabricated electrode, GNPs@CDs/erGO/GCE, was explored by cyclic voltammetry and electrochemical impedance spectroscopy. The electrochemical performance of the electrode demonstrated a remarkable enhancement in the peak current toward oxidation of dopamine (DA) and uric acid (UA) with a peak potential separation of 0.15 V in the presence of ascorbic acid (AA). Under optimized conditions, the simultaneous determination of DA and UA was investigated using differential pulse voltammetry (DPV) resulting in a linear response in the concentration ranges of 0.01−5.0 μM and 5.0−20.0 μM for DA and of 0.1−20.0 μM and 20.0−50.0 μM for UA and in a sensitivity of 11.96 and 6.48 μA μM -1 , respectively. The prepared electrode also demonstrated long-term stability and good reproducibility and was successfully used for the determination of DA and UA in human serum samples with favorable recoveries.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 33
·2301727
·
IF 19
Amjad Farid,Chen Zhonghua,Abdul Sammed Khan,Muhammad Javid,Ijaz Ahmad Khan,Aqib Ali Khan,Zeng Fan,Lujun Pan
High fabrication cost, chemical instability, and complex immobilization of enzyme molecules are critical issues of enzyme-based glucose sensors. Designing state-of-the-art, binder-free, and non-enzymatic glucose sensing probes plays an imperative role to cope with the aforementioned issues. 3D carbonaceous nanomaterials coated with transition metal vanadates (TMVs) are a favorable biomimetic platform for glucose quantification. Peculiar hierarchical structure, enhanced conductivity, synergistic interaction, multiple oxidation states, and high catalytic activity would make such composite a potential contender for non-enzymatic glucose sensing. Herein, 3D helical-shaped carbon nanocoils (CNCs) are grown on nickel foam (NF) via chemical vapor deposition method to prepare a robust CNCs/NF scaffold. Then, a hydrothermal route is followed to grow interconnected free-standing Ni 3 V 2 O 8 nanosheets (NSs) on CNCs/NF scaffold. This novel and binder-free Ni 3 V 2 O 8 NSs/CNCs/NF hierarchical composite possesses superior electrochemical active area (ECSA) and exceptional electrochemical efficacy. Amperometric analysis exhibits extremely prompt detection time (0.1 s), elevated sensitivity (5214 µA mM −1 cm −2 ), and low detection limit (0.04 µM). Developed sensor demonstrates appreciable recoveries (93.3 to 103.3%) regarding glucose concentration in human serum. The appealing analytical results show that deployment of a 3D helical-shaped hierarchical smart scaffold can be an effective strategy for developing efficient and advanced non-enzymatic glucose sensors.
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ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Chunfang Wang,Yun Tang,Bihong Zhang,Ziying Zhong,Faqiong Zhao,Baizhao Zeng
In this study, PO 4 3− doped Bi 2 WO 6 (BWO-PO) was prepared by hydrothermal method , and then copolymer of thiophene and thiophene-3-acetic acid (P(Th-T3A)) was chemically deposited on the BWO-PO surface. The introduction of PO 4 3− created point defects , greatly improving the photoelectric catalytic performance of Bi 2 WO 6 ; the copolymer semiconductor could form heterojunction with Bi 2 WO 6 to promote the separation of photo-generated carriers, due to its proper band gap. Furthermore, the copolymer could enhance the light absorption ability and photo-electronic conversion efficiency. Hence, the composite had good photoelectrochemical properties. When it was combined with carcinoembryonic antibody through the interaction of –COOH groups of the copolymer and the end groups of antibody for constructing ITO-based PEC immunosensor, the resulting sensor exhibited superb response to carcinoembryonic antigen (CEA), with a wide linear range of 1 pg/mL−20 ng/mL, and a relatively low detection limit of 0.41 pg/mL. It also showed high anti-interference ability, stability, and simplicity. The sensor has been successfully applied to monitor the concentration of CEA in serum. The sensing strategy can also be applied to the detection of other markers by changing the recognition elements, hence it has good application potential.
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高影响因子
Biomass Conversion and Biorefinery
·
2023
·
IF 4
Du Peng,Chu Zhengkun,Zhang Jing,Ma Jieyu,Cao Feng,Liu Jie
With the increase of agricultural production, the utilization of biomass waste has become the focus of current research. In this study, Si-containing carbon dots (Si-CDs) were prepared from peanut shells by one-pot hydrothermal method. These Si-CDs exhibit peroxidase-like activity and can catalyze H 2 O 2 oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) to produce a chromogenic reaction, while cysteine (Cys) can reduce the oxidation product of TMB (ox-TMB) to discolor it. A method for the determination of Cys using Si-CDs as peroxidase was developed. In addition, the effect of environmental factors on the enzyme-like reaction was investigated. The experimental results showed that the best catalytic effect was achieved at pH = 2.5, reaction temperature of 60 °C, and reaction time of 55 min when the concentrations of TMB and H 2 O 2 were 5 mmol·L −1 and 2.75 mmol·L −1 , indicating that Si-CDs still have the potential for enzymatic activity in extreme environments. The decrease in absorbance of the system (ΔA) showed a good linear relationship with Cys in the range of 5–100 μmol·L −1 , and the limit of detection was 0.037 μmol·L −1 . This sensor was successfully used for the determination of edible Cys content.
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Journal of Cleaner Production
·
2023
·
IF 11.1
Shi Liu,Wen Cao,Fanrui Meng,Mingming Du,Wenwen Wei,Yunan Chen,Hui Jin,Liejin Guo
Supercritical water gasification (SCWG) of biomass waste as a new clean waste conversion technology is increasingly valued worldwide attributable to the unique properties of supercritical water (water: T > 374 °C, P > 22.1 MPa). However, the fate of conventionally contaminated elements such as nitrogen in this process still warrants further research to control potential contamination. In this work, uric acid was used as the model compound of nitrogenous components in chicken manure to investigate the transformation mechanism of nitrogen during the SCWG process. The effects of different temperatures (550–650 °C) and residence times (2–30 min) on the gasification characteristic of uric acid and the behaviour of nitrogen were experimentally explored. The results indicated that the higher temperatures and longer residence time significantly facilitated the uric acid gasification and nitrogen transformation. The maximum nitrogen conversion efficiency was 84.83%, and the maximum yield of NH 3 , H 2 , and CO 2 reached 20.20 mol/kg, 23.78 mol/kg, and 20.10 mol/kg at 650 °C and 30 min, respectively. Subsequently, the reaction pathways of nitrogen in uric acid were proposed in detail according to the product analysis. Finally, a kinetic model was developed to describe the SCWG process, especially the reaction kinetic of nitrogenous products. The results revealed that the hydrolysis reactions of uric acid led to a rapid increase in NH 3 yield in the initial stage of the SCWG process. As the process continued, the increase in NH 3 was mainly due to the deamidation reaction of small-molecule nitrogenous intermediates. Notably, NO x , NO 2 − , and NO 3 − were not detected in products, validating the inhibitory effects of the reducing environment of supercritical water on the generation of nitrogen oxides.
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