SENSORS AND ACTUATORS B-CHEMICAL
·
2014
·
IF 3.84
Xianyi Cao,Fei Shen,Minwei Zhang,Chunyan Sun
A very practical and competitive sensing strategy for melamine has been developed based on the efficient inner filter effect (IFE) of Ag nanoparticles (AgNPs) on the fluorescence of eco-friendly ZnSe quantum dots (QDs). The fluorescence emission of ZnSe QDs could be quenched significantly by AgNPs via IFE, which resulted in a fluorescence “off-state”. The presence of melamine could induce the aggregation of AgNPs and modulate the IFE process. Thus the IFE-decreased fluorescence could gradually recover in a melamine concentration-dependent way, thereby achieving the fluorescence “turn-on” sensing for melamine. The detection mechanism was clearly illustrated and the influences of various experimental conditions were also investigated. Under the optimal conditions, a decent linear relationship for melamine was obtained in the range from 1.0 to 36 μg L −1 , and the detection limit was as low as 0.11 μg L −1 . The IFE-based strategy was successfully applied for melamine analysis in raw milk and egg samples and satisfactory results have been achieved. Therefore, it is very promising to use this simple, rapid, sensitive and eco-friendly method for on-site and real-time screening of melamine.
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高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Zhaoxia Cao,Jiarou Wu,Xiaofeng Ma,Yujie Jiao,Xiangnan Li,Yuantao Cui,Mingguo Yang,Yanhong Yin,Shuting Yang
Rational designing of advanced free-standing consisting of carbon nanofibers (CNFs) based carbonaceous materials and electrochemically active materials, is a promising strategy for developing flexible energy storage and conversion systems. Here, we propose a controllable architectural design of flexible multilevel ZnSe-CoFe@CNT/CNF heterostructure via a one-pot electrospinning and carbonization strategy. Uniformly dispersed ZnSe nanoparticles are inlaid in N-doped CNF skeleton with CoFe alloy embedded at the tips of the in-situ grown dendritic CNTs to form the hierarchical network. Interestingly, the hybrid can be tailored based on the synergistic catalysis effect of CoFe and its cocatalyst, and the formation mechanics is also proposed. Thanks to rich N doping, dense CNT branches, multiple heterogeneous interfaces, and bountiful space accommodating volume expansion of active ZnSe, the delicate architecture can afford efficient electron/ion transport with significantly improved mechanical properties and conductivity. As a proof-of-concept of a free-standing electrode material, the ZnSe-CoFe@CNT/CNF hybrid was utilized in representative Lithium-ion batteries (LIBs) and Sodium-ion batteries (SIBs). As anticipated, the two types of batteries show excellent cycle stability and rate performance. At 5 A/g，the electrode can achieve a high specific capacity of 813.5 mAh/g in LIBs. For SIBs, a specific capacity of 250.5 mAh/g is provided after 1000 cycles at 4 A/g. Accordingly, this work provides a new perspective for rational fabrication and design of free-standing electrodes for advanced LIBs/SIBs and beyond.
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高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Dandan Song,Guoqiang Li,Qian Liu,Xingge Huang,Weiyu Wang,Faming Gao
The accurate monitoring of pesticide residues in agricultural products is critical for maintaining food quality and human health. The development of innovative analysis techniques capable of satisfying the stringent demands of practical applications is the key to building intelligent and highly-efficient pesticide detection equipment. Here, an ultrasensitive electrochemical biosensor has been reported, which utilizes quinary PtPdRhFeCu high-entropy alloy mesoporous nanotubes (PtPdRhFeCu HEA mNTs) and N/Cu dual-atom anchored ZnSe@C (N-Cu-ZnSe@C) as electrode materials. Multi-effect coupling (defect effect, high entropy effect, lattice distortion effect and doping effect), endows the proposed sensing interface with extremely high electronic conductive properties and unprecedentedly large electroactive surface area, which could heavily promote the charge transfer capability, meanwhile assists the acetylcholinesterase (AChE) with high affinity towards its substrate, thereby significantly improving the pesticide analysis performance of the sensor. Remarkably, the detection limit of this assembled biosensor for aldicarb sulfone and methamidophos detection are notably low at 2.32 fM and 4.58 fM, respectively. Moreover, this biosensor demonstrated wide detection ranges (7 pM ∼ 70 nM for methamidophos and 1 pM ∼ 0.1 μM for aldicarb sulfone), high sensitivity and specificity, along with good recovery rates (86.67 % ∼ 117.14 %) in real samples. This signal amplification strategy enhances the analysis capability by integrating multiple effects, and provides an innovative analysis tool for hazardous substance analysis in food safety and environmental monitoring research.
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DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2018
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IF 5.123
Yupin Cao,Guichun Mo,Jinsu Feng,Xinxin He,Lifu Tang,Chunhe Yu,Biyang Deng
A highly sensitive sandwich-type magnetic immunoassay based on inductively coupled plasma mass spectrometry detection in single particle mode, with ZnSe Quantum dots (QDs) serving as model tags, was proposed. The transient signals induced by the flash of ions ( 64 Zn + ) in the plasma torch from the ionization of nanoparticles tagged on antibody were recorded in a single particle mode. The frequency of transient signals is directly related to the concentration of nanoparticle tags, and the concentration of nanoparticle tagged antibodies can be quantified by the frequency of transient signals. Amino-modified magnetic nanoparticles (AMNPs) were synthesized and conjugated with primary carcinoembryonic antigen (CEA) antibody to extract the target biomarker. ZnSe QDs were synthesized as a probe to determine CEA by ICP-MS. A detection limit of 0.006 ng mL −1 was obtained for CEA after immunoreactions, and a wide linear range of 0.02–100 ng mL −1 with the relative standard deviation (RSD) was 4.4%. The method was successfully applied to human serum samples.
研究领域:
分析化学
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生物标志物检测
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纳米技术
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医学诊断
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PubMed
高影响因子
Nanoscale
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2017
·Vol. 9
·期 39
·15044-15055
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IF 7.367
Dong Li,Guanjie Xing,Shilin Tang,Xiaohong Li,Louzhen Fan,Yunchao Li
We report herein a heat-triggered precursor slow releasing route for the one-pot synthesis of ultrathin ZnSe nanowires (NWs), which relies on the gradual dissolving of Se powder into oleylamine containing a soluble Zn precursor under heating. This route allows the reaction system to maintain a high monomer concentration throughout the entire reaction process, thus enabling the generation of ZnSe NWs with diameter down to 2.1 nm and length approaching 400 nm. The size-dependent optical properties and band-edge energy levels of the ZnSe NWs were then explored in depth by UV-visible spectroscopy and cyclic voltammetry, respectively. Considering their unique absorption properties, these NWs were specially utilized for fabricating photoelectrochemical-type photodetectors (PDs). Impressively, the PDs based on the ZnSe NWs with diameters of 2.1 and 4.5 nm exhibited excellent responses to UVA and near-visible light, respectively: both possessed ultrahigh on/off ratios (5150 for UVA and 4213 for near-visible light) and ultrawide linear response ranges (from 2.0 to 9000 μW cm−2 for UVA and 5.0 to 8000 μW cm−2 for near-visible light). Furthermore, these ZnSe NWs were selectively doped with various amounts of Mn2+ to tune their emission properties. As a result, ZnSe NW film-based photochromic cards were creatively developed for visually detecting UVA and near-visible radiation.
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PubMed
高影响因子
Journal of Materials Chemistry B
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2017
·Vol. 5
·期 41
·8152-8160
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IF 4.543
Jie Zhang,Jie Wang,Tong Yan,Yanan Peng,Dajun Xu,Dawei Deng
Quantum dots (QDs) exhibit many unique optical properties, and show great promise as fluorescent markers in molecular, cellular and in vivo imaging. In this thematic issue, a major concern is their cytotoxicity. Among various Cd-free alternatives, InP-based QDs without highly toxic heavy metal elements have received the most attention. This article first focuses on the synthetic control of oil-soluble InP/ZnSe/ZnS QDs, exhibiting strong dual emissions, namely, visible excitonic emission and near-infrared (NIR) surface defect emission. Next, the organic-to-aqueous phase transfer of the dual emissive QDs was explored systematically. It was found that the dual emissions are relatively stable against the water transfer strategies used here; among them, aqueous dual emissive QDs obtained by wrapping oil-soluble QDs with a poly(acrylic acid)-octylamine (PAA-based) amphiphilic polymer (or modified with the cRGD peptide) exhibit enhanced NIR emission. Finally, using in vitro cell and in vivo small animal optical imaging techniques, the bioactivities of the cRGD-modified amphiphilic polymer-wrapped QDs were also investigated. The results confirm that single-wavelength excitation with strong dual emissions ranging from 550 to >1000 nm will endow the InP-based QDs with the capability for biomedical optical imaging across different spatial scales, as a promising alternative for Cd- and Pb-based QDs.
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PubMed
高影响因子
Materials Today Physics
·
2022
·
IF 11.021
Qiqin Liang,Jingjing Zhang,Xiaosi Qi,Lei Wang,Junfei Ding,Xiu Gong,Jingliang Yang,Yanli Chen,Yunpeng Qu,Qiong Peng,Wei Zhong
The selenylation/sulfuration of magnetic precursor brings about the great challenges to construct magnetic transition metal dichalcogenides (TMDs)-based multicomponent nanocomposites (MCNCs), which greatly hinders the improvements in magnetic loss ability and impedance matching characteristic. Theoretically speaking, the addition of carbon layer is conducive to protect the magnetic nanoparticles, optimize the impedance matching, strengthen the interfacial polarization and magnetic loss abilities, and so on. In order to verify these ideas, herein, we elaborately designed and produced core@shell ZnSe/FeSe 2 @MoSe 2 and core@shell@shell ZnFe 2 O 4 @C@MoSe 2 flower-like MCNCs. The results of comparative study indicated that the as-prepared ZnSe/FeSe 2 @MoSe 2 and ZnFe 2 O 4 @C@MoSe 2 with the different MoSe 2 contents and flower-like geometrical morphologies could be synthesized by regulating the amounts of Mo and Se sources. And the introduction of carbon layer not only effectively inhibited the selenylation of ZnFe 2 O 4 precursor, but also greatly improved the impedance matching characteristic, dielectric and magnetic loss capabilities. The obtained ZnFe 2 O 4 @C@MoSe 2 MCNCs presented the excellent comprehensive microwave absorption properties (MAPs) including strong absorption capability, broad frequency bandwidth and thin matching thickness. Therefore, our findings not only presented a simple and viable route to produce magnetic TMDs-based MCNCs, but also provided an effective strategy to boost their comprehensive MAPs.
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高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Mingrui Liu,Guangmin Li,Shunsheng Wei,Hongfei Liu,Gaoling Yang
Chiral semiconductor nanocrystals (NCs) represent a promising class of materials for various applications, including biological sensing, photonics, and spin-polarized devices. However, the comprehension of the mechanisms underlying ligand-induced chiroptical effects in NCs has been limited by the constraints of current theoretical and experimental models, particularly those involving simple spherical NCs. In this study, we examined the relationship between optical activity and band structures in core–shell dot-in-rod NCs, specifically CdSe@CdS, ZnSe/CdS@CdS, and ZnSeTe/CdS@CdS dot-in-rod NCs, which were functionalized with chiral ligands. By manipulating the wave function distribution of electrons and holes within the dot-in-rod NCs, we demonstrated through circular dichroism (CD) measurements that a reduction in the number of holes within the synthesized dot-in-rod NCs correlates with a decrease in the g factor. This conclusion was corroborated by theoretical calculations. Furthermore, the fabrication of chiral CdS-Au heterojunctions and the application of electron quenchers revealed that the reduction of the g factor also suggests the significant role of electrons in the generation of chirality. Our findings not only enhance the understanding of the fundamental origins of induced chirality effects in semiconductor NCs but also provide a clear methodology for the design of optimal optically active chiral NCs, thereby paving the way for future applications utilizing chiroptical materials.
研究领域:
纳米材料
·
半导体物理
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手性光学材料
·
量子点
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光电子学
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表面化学
·
理论凝聚态物理
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高影响因子
危险品化学品经营许可证（带存储）