SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Li Yang,Qixin Chen,Yiheng Yuan,Xishun Peng,Xinghua Li,Cheng Zuo,Zhangyu Zhou,Zhongchen Bai
Detecting γ-aminobutyric acid (GABA) in the mammalian body is vital for diagnosing neurological disorders. Here, we introduced a novel SERS sensor based on metal-semiconductor heterojunction ZnO/Cu@Ag substrate for highly sensitive detecting GABA molecules. The ZnO/Cu@Ag substrate fully leverages the electromagnetic field enhancement effect and the chemical enhancement effect of metal-semiconductors heterojunction, exhibiting an excellent enhancement factor of 2.23 × 10 6 and a low limit-of-detection (LOD) of 3.84 nM for GABA molecules in water. Moreover, the ZnO/Cu@Ag substrate could recognize 10 nM GABA molecules in human serum. This GABA SERS sensor provides a reliable tool and technological support for research and applications in neuroscience and medicine.
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高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2024
·
IF 4
Zahid Nawaz,Nevin Gürbüz,Muhammad Naveed Zafar,Muhammad Nawaz Tahir,İsmail Özdemir,Ryan J. Trovitch
A mild catalytic protocol for aldehyde, amine, and alkyne coupling (A 3 -coupling) allows for the selective synthesis of propargyl amines using 5,6-dimethylbenzimidazole-derived N-heterocyclic carbene (BNHC) silver(I) catalysts. A series of BNHC Ag(Ⅰ) halide complexes were synthesized and their structures have been elucidated through the use of multinuclear NMR and FT-IR spectroscopy. Furthermore, the pseudo-linear geometry of two different compounds was substantiated by single-crystal X-ray diffraction. Silver-based A 3 -coupling was achieved for both acyclic and cyclic secondary amines using a diverse set of alkynes to afford propargyl amines with yields of up to 95 %. The present approach is environmentally benign and water is generated as the sole byproduct.
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高影响因子
CHEMISTRY LETTERS
·
2019
·Vol. 48
·期 8
·795-798
·
IF 1.485
Gan Lu,Xu Cigang,Yang Jiangrong,Ma Yunfeng,Cai Jinguang,Watanabe Akira
This study reports an effective process to prepare holey carbon nanotubes (hCNTs) through a catalytic oxidation reaction under the assistance of Ag nanoparticles. The improved specific surface area and oxygenic functional groups generated during the perforating process endowed hCNTs with highly improved capacitance. Besides, micro-supercapacitors based on hCNTs delivered a specific capacitance of 59.2 mF/cm2 at 0.3 mA/cm2, more than twice that of the 23.8 mF/cm2 for MWCNTs, which is among the best values compared to results reported in the literature.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Peng Xu,Weiwei Lu,Jinjin Zhang,Li Zhang
Developing an efficient catalyst for H2 generation from hydrolysis of ammonia borane (AB) in a controllable and sustainable way is a prerequisite to implementing H2 as an alternative energy vector. To meet this requirement, the present work designs and constructs a potential Ag@Pd core–shell catalyst, in which the plasmonic Ag nanocube core acts as a light absorber and the ultrathin Pd shell as the actively catalytic site. First, the core–shell structure of the prepared Ag@Pd samples is characterized and confirmed by an electron microscope and energy dispersive spectroscopy. Then their catalytic performances for AB hydrolysis are investigated and compared with Ag nanocubes under the light on/off condition and at different temperatures. The results show that the H2 generation rate on Ag@Pd is greatly enhanced, which is found to benefit from the reduced activation energy under light illumination. Further investigation of wavelength-dependent performance verifies the plasmon-driven nature of the Ag@Pd catalysts. The subsequent optical simulation using the finite element method indicates that the absorbed light energy is instead preferential to dissipate into the nonplasmonic but catalytic Pd site when the Pd shell coats on the plasmonic Ag nanocube. This leads to the concentration of energetic charge carriers in the outer Pd shell and thus the much higher catalytic efficiency of Ag@Pd core–shell catalyst than its single compartment for breaking down the N–B bond of AB to produce H2 gas.
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ACS Sustainable Chemistry & Engineering
·
2014
·
IF 0
Fenfen Lu,Daohua Sun,Jiale Huang,Mingming Du,Feng Yang,Huimei Chen,Yingling Hong,Qingbiao Li
Herein, we reported the green synthesis of Ag–Pd alloy nanoparticles (NPs) using the aqueous extract of the Cacumen platycladi leaves as well as their application as catalyst for hydrogenation of 1,3-butadiene. The biosynthetic NPs were characterized to confirm the nature of alloy by UV–vis spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), and energy dispersive X-ray spectroscopy (EDX). The possible functional groups responsible for the reduction and protection of NPs were identified through Fourier transform infrared spectroscopy (FTIR). The results revealed that biomolecules like saccharides, polyphenols, or carbonyl compounds were related to the reduction process, and the (NH)C═O groups were responsible for the stabilization of the NPs. Furthermore, the as-formed Ag–Pd bimetallic-supported catalysts especially Ag1Pd3/γ-Al2O3 was found to possess excellent catalytic performance toward hydrogenation of 1,3-butadiene. A butene yield of 84.9% was obtained, which was remarkably enhanced when compared with monometallic counterparts. Moreover, the activity of it maintained stability within 12 h of durable experiments.
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ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Zhiqiang Zhou,Liyun Yang,Ling Huang,Yuanping Liao,Yi Liu,Qi Xiao
The selective and quantitative detection of H 2 O 2 is important for its employment in physiological, environmental and industrial applications. In this paper, a sensitive and selective strategy for H 2 O 2 detection was established based on the fluorescence quenching of CdSe@ZnS quantum dots (QDs) by H 2 O 2 -mediated etching process of Ag nanoclusters (AgNCs). In this strategy, dihydrolipoic acid (DHLA) modified AgNCs were applied as H 2 O 2 response group, the existence of H 2 O 2 could initiate the oxidation of AgNCs and the production of Ag + . CdSe@ZnS QDs are very sensitive to Ag + , which could give rise to the effective fluorescence quenching of CdSe@ZnS QDs. Based on this strategy, the present fluorescent assay could realize the quantification detection of H 2 O 2 and the limit of detection is calculated to be 0.3 μM under the optimum conditions. Furthermore, CdSe@ZnS/AgNCs hybrid-based probe was applied to detecting H 2 O 2 in milk samples and showed a good recoveries results ranged from 95.8% to 112.0%, meaning the potential applicability of this strategy.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Rui Liu,Xin Zhang,Tianheng Wu,Rijia Liu,Wenyu Cui,Yuan Sun,Binqiao Ren
Developing efficient and sensitive techniques for detecting ofloxacin (OFL) residues is crucial for ensuring food safety and environmental protection. In this study, the electropolymerization method was utilized with polypyrrole (Ppy) as the functional monomer and OFL as the template to produce a molecularly imprinted composite material comprising silver (Ag) and graphitic carbon nitride (g-C 3 N 4 ) (MIP-Ag/g-C 3 N 4 /GCE) for the electrochemical detection of OFL. The electrochemical characterization was conducted using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Under the optimal conditions, the prepared sensor demonstrated decent sensitivity and selectivity using the differential pulse voltammetry (DPV) technique. The sensor demonstrated an optimal linear range of 10 −13 to 10 −11 mol L −1 , with a low limit of detection (LOD) of 8.842×10 −14 mol L −1 and a limit of quantification (LOQ) of 2.947×10 −13 mol L −1 , which can successfully detect OFL in milk and honey samples, showing a recovery range of 97.38–104.00 %, and 99.45–102.00 %, with relative standard deviations (RSD) below 2.82 % and 2.16 % (n=5), respectively. The sensor exhibited high selectivity, high stability, and decent reproducibility in OFL determination. This study offers valuable insights into the application of semiconductor-based electrochemical sensors, opening new possibilities for the field and contributing to the improvement of food safety and environmental protection.
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高影响因子
VIBRATIONAL SPECTROSCOPY
·
2020
·
IF 1.917
Zhe Wang,Qi Wang,Chunxia Liu,Fangyu He,Zhiguo Song,Qiubei Qiu,Jun Yan,Weiwei Zhu
Polyphenols are a kind of vital biologically active substances in fruits and vegetables. In this study, with the reductive ability in the alkaline solution, eight polyphenols[(-)-Epigallocatechin gallate (EGCG), (-)-Epigallocatechin (EGC), (-)-Epicatechin gallate (ECG), (-)-Epicatechin (EC), (-)-Gallocatechin gallate (GCG), (-)-Gallocatechin (GC), (+)-Catechin (C) and Gallic acid (GA)] could produce silver nanoparticles(AgNPs) with [Ag(NH 3 ) 2 ] + . It was found that the AgNPs had intense surface plasmon resonance bands at 415 nm and RRS spectra signals at 450 nm, which were linearly related to the concentration of polyphenols. It was used for the spectrophotometric and RRS spectra determination of the former eight polyphenols with low detection limits. The developed method was applied for the determination of polyphenols in tea and products.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 14
·6076-6082
·
IF 3.269
M. X. Hu,Q. Guo,J. N. Li,C. M. Huang,G. R. Ren
Metal nanoparticles exhibit high catalytic activity in catalytic reactions due to their large surface area and abundant exposed coordination sites. Immobilization of metal nanoparticles provides an efficient method to increase the chemical stability and mechanical strength of the metal nanoparticles. Compared with the free metal nanoparticles, the immobilized metal nanoparticles are particularly suitable as they can be recycled and used in the flow-through systems. Polymeric membranes with high specific surface area are suitable carrier materials to immobilize nanoparticles. In this study, Ag nanoparticals (AgNPs) were uniformly immobilized on the surface of microporous polypropylene membranes (MPPMs) via in situ reduction of Ag+ by the polydopamine (PDA) layer adhered on the membrane surfaces. FT-IR/ATR was used to characterize the chemical structure of MPPMs after modification. SEM and EDX mapping images were obtained to characterize the distribution and stability of the AgNPs on the membranes. The amount of immobilized AgNPs is directly linked to the skin layer of PDA on the membranes. The AgNP-immobilized membranes showed high catalytic activity for methylene blue (MB) reduction with NaBH4. The dye solution quickly and completely discolored as the MB solution flowed past the AgNP-immobilized MPPM. Ethanol is a good cleaning and wetting agent to regenerate the AgNP-immobilized membranes and improve the catalytic activity of the membranes. The flow rate and residence time together define the catalytic efficiency. The flow-through membrane reactor had the best performance when the flow rate was greater than 210 L m−2 h−1 (the residence time was only 2 s). These results reveal the promising potential large-scale applications of the AgNP-immobilized membranes for dye removal and wastewater treatment.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Tianran Lin,Minqing Zhang,Fuhai Xu,Xingyu Wang,Zhifei Xu,Liangqia Guo
A fast, sensitive and high-resolution colorimetric method for sensing benzoyl peroxide (BPO) was proposed by using orange sheath-like [email protected] nanorods (NRs) as the signal transducer. BPO can oxidize Ag nanoshells on the surface of [email protected] NRs; the etching of Ag nanoshells changes the aspect ratio of Au nanostructures and causes a red-shift of longitudinal local surface Plasmon resonance (LSPR) peak, resulting in a sharp-contrast multicolor change within 2 min. Under the optimal conditions, the red-shift of longitudinal LSPR peak was in linear with the BPO concentration over the range of 0–100 μmol L −1 with a limit of detection of 0.75 μmol L −1 . Furthermore, a simple, inexpensive and portable test kit was designed for the visual detection of BPO. A color variation can be distinguished by naked eyes at a concentration of BPO as low as 20 mg kg −1 in flour samples. The colorimetric sensor shows a great potential application for the rapid and on-site assay of BPO in flour samples.
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Advanced Electronic Materials
·
2018
·Vol. 5
·期 1
·1800548
·
IF 5.466
Changzeng Yan,Tianhang Yu,Chao Ji,Dae Joon Kang,Ning Wang,Rong Sun,Ching-Ping Wong
Ever-increasing packaging and power densities of modern electronic devices in the present “More-than-Moore” technology era demand higher performance thermal interface materials (TIMs). However, conventional composite TIMs require higher loading to achieve better thermal conductive property, resulting in a mechanical problem. The poor wetting property of matrix loading materials further increases the interfacial thermal resistance (ITR). In this work, a one-step hydrothermal method is employed to grow 2D molybdenum disulfide (MoS 2 ) nanosheets on a tellurium (Te) nanowire skeleton and silver (Ag) nanoparticles are further decorated on MoS 2 nanosheets via the photoreduction method. The in-plane thermal conductivity of the final nanocomposite reaches as high as 10.4 W m −1 K −1 , which is 4,160% higher than that of a pure epoxy resin and one order of magnitude higher than that of conventional polymeric nanocomposites. The 3D interconnected heat transferring network of Te/MoS 2 /Ag greatly enhances the thermal stability of the composite in practical applications. The rational materials design concept may contribute to the development of new types of high-performance thermal management materials.
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高影响因子
WATER RESEARCH
·
2022
·
IF 13.4
Dingyuan Liang,Xiangrui Wang,Wenhong Fan
s The entering of silver nanoparticles (Ag NPs) in natural environments constantly increases due to their widespread production and application. While the environmental behavior, impacts, and fate of Ag NPs were critically assessed, the main challenge represents continuous tracking and quantification of Ag NPs in environmental and biological matrices. A group of labeled Ag NPs with gold cores (Au@Ag NPs) was developed for distinguishing between pristine Ag NPs and their other forms, and we comprehensively compared their physicochemical properties, environmental behavior, and biological effects with unlabeled Ag NPs. The electron transfer process from the Au core to the Ag shell gradually decreased with the increase of Ag shell thickness, then the inhibition of Ag + release induced by the Au core was gradually alleviated, but the generation of superoxide radicals was intensified sharply. Then, the effect of the Au core on the dissolution capacity and free radicals’ generation significantly altered the biological toxicity of Ag NPs, and the influence degree was related to the test organism's species. Nevertheless, the Au core retained the surface properties of Ag NPs, leading to the uptake of Au@Ag NPs, entirely consistent with the behavior of unlabeled Ag NPs. These findings confirmed that Au core labeling provides new opportunities for tracking Ag NPs in environmental and biological systems, and the exposure conditions and test organisms should be carefully assessed before employing the Au core labeling technology.
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