Journal of Analysis and Testing
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2017
·Vol. 1
·期 4
·291-297
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IF 0
Majeed Saadat,Gao Wenyue,Lai Jianping,Wang Chao,Li Jianping,Liu Zhongyuan,Xu Guobao
Abstract Most luminescent glucose sensors based on the interaction of glucose with organic boric acids or borates. Herein, a new luminescent glucose sensor is designed using thioglycolic acid-capped CdTe quantum dots in the presence of cheap inorganic boric acid. Both peak position and intensities change upon the addition of glucose because of the interaction of boric acid with glucose and thioglycolic acid-capped CdTe quantum dots, which enables glucose detection by either color change or intensity change. The luminescent intensities change linearly with glucose concentrations in the ranges from 0.03 to 1 mM and 1–25 mM with a detection limit of 10 µM ( S / N = 3). Moreover, glucose concentrations can be conveniently detected by color change in the range from 1 mM–25 mM. It displays a highly selective response to glucose over other interfering but biologically important saccharides, amino acids, and common ions. Graphical Abstract A thioglycolic acid-capped CdTe QD-based sensor can detect glucose with wide linear range by change in intensity or color in the presence of cheap inorganic boric acid.
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APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Zhiping Zhou,Haiqin Ying,Yanyan Liu,Wanzhen Xu,Yanfei Yang,Yu Luan,Yi Lu,Tianshu Liu,Shui Yu,Wenming Yang
This paper demonstrates a facile method to synthesize surface molecular imprinting polymer (MIP) on SiO 2 -coated CdTe QDs for selective detection of sulfadimidine (SM 2 ). The fluorescent MIP sensor was prepared using cadmium telluride quantum dots (CdTe QDs) as the material of fluorescent signal readout, sulfadimidine as template molecule, 3-aminopropyltriethoxysilane (APTES) as functional monomer and tetraethyloxysilane (TEOS) as cross-linking agent. The CdTe cores were embed in the silicon shells by a sol-gel reaction and then the molecular imprinting layers were immobilized on the surface of the SiO 2 -coated CdTe QDs. Under the optimized conditions, the relative fluorescent intensity weakened in a linear way with the increasing concentration of sulfadimidine in the range of 10–60 μmol L −1 . The practical application of the fluorescent MIP sensor was evaluated by means of analyzing sulfadimidine in the real milk samples. The recoveries were at the range of 90.3–99.6% and the relative standard deviation (RSD) ranged from 1.9 to 3.1%, which indicates the successful synthesis of the fluorescent MIP sensor. This sensor provides an alternative solution for selective determination of sulfadimidine from real milk samples.
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ACS Applied Materials & Interfaces
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2024
·
IF 8.3
Abdul Basit,Tanveer Hussain,Xin Li,Jiwu Xin,Bin Zhang,Xiaoyuan Zhou,Guoyu Wang,Ji-Yan Dai
Being a major obstacle, Ag2Te has always been restricted in p-type AgSbTe2-based materials to improve their thermoelectric performance. This work reveals a stabilized AgSbTe2 through Sn/Ge alloying as synthesized by melting, annealing, and hot press. Interestingly, addition of Sn/Ge in AgSbTe2 extended the solubility limit up to ∼30% and hence suppressed Ag2Te in Ag(1–x)SnxSb(1–y)GeyTe2 compounds and led to enhanced electrical transport. Moreover, electrical and thermal transport properties of AgSbTe2 have been greatly affected by the phase transition of Ag2Te near 425 K. However, high-entropy Ag0.85Sn0.15Sb0.85Ge0.15Te2 compound results in a stabilized rock-salt structure and presents a high power factor of ∼10.8 μW cm–1 K–2 at 757 K. Besides, density functional theory reveals that available multivalence bands in Sn/Ge-doped AgSbTe2 lead to reduction in energy offsets. Meanwhile, a variety of defects appear in the Ag0.85Sn0.15Sb0.85Ge0.15Te2 sample due to entropy change, and thus lattice thermal conductivity decreases. Ultimately, a high figure of merit of ∼1.5 is attained at 757 K. This work demonstrates a roadmap for other group IV–VI materials so that the high-entropy approach may inhibit the impurity phases with extended solubility limit and result in high thermoelectric performance.
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MICROCHEMICAL JOURNAL
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2024
·
IF 4.9
Lianlian Wang,Yongfeng Cui,Yiduo Mi,Luyao Wang,Bing Han,Yadan Guo
Heavy metal ions pollution is one of the most threatened issues for human health and ecosystem balance. Herein, a promising microfluidic chip with microgel arrays for realizing the simultaneously point of care test to multiple pathogenic heavy metal ions was designed, which consisted of a sample perfusion area in the center (pipe width 200 μm), and four detection chambers (width 8000 μm, length 20000 μm) with microcolumn arrays (radius 100 μm, width 550 μm), all the heights were 100 μm. With simulation of the fluid flow, the flow rate of 5 mL/min made the microgel successfully patterning the precursor in microcolumn. By utilizing different kinds of quantum dots microgels, this chip could achieve specific and on-site quick detection for Pb 2+ , Co 2+ , Cu 2+ and Fe 3+ . Moreover, the gel composition had almost no effect on the performance of quantum dots and owned enough space after losing water to absorb the sample solution for reacting with the analytes. Furthermore, this POCT microfluidic chip was applied in the detection of actual water samples, and the fluorescence quenching of the chip was visible to naked eyes. It possessed the potential to achieve the ions quantitative determination. Therefore, this method realized the simultaneous detection of multiple pathogenic heavy meatal ions rapidly and availably and could further applied in actual water pollution samples with enormous advantages.
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JOURNAL OF HAZARDOUS MATERIALS
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2024
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IF 12.2
Bo Zhao,Fang Chen,Kexin Zhou,Manfeng Lin,Lihu Shi,Shican Mi,Haixia Pan,Qiang Yao,Xin Zhao
Microplastics and nanoplastics (NPs) are pollutants of global concern. However, the understanding of the combined effects of NPs and other pollutants in the soil-plant system remains limited, particularly for polyethylene (PE), the primary component of agricultural films. This study investigated the effects of PE NPs (0.5%, w/w), fungicide tebuconazole (Te, 10 mg·kg -1 ), and cadmium (Cd, 4.0 mg·kg -1 ) on the soil-wheat system under single and combined exposures. The synergistic toxicity observed between NPs and Te impacted the nutritional conditions and antioxidant mechanisms of the soil-wheat system. The NPs increased the concentration of Cd in roots and the proportion of bioavailable Cd, exacerbating oxidative stress in wheat and inhibiting biomass. The soil-wheat system responded to stress by upregulating or downregulating pathways related to carbohydrate, amino acid, and sugar metabolism under various treatments. Sixteen functional genes associated with carbohydrate metabolism, amino acid metabolism, energy utilization, and gene repair at KEGG level 3 were employed to sustain microenvironmental homeostasis. Correlation analysis between microorganisms and environmental factors showed that various PGPG played roles in maintaining the health of the soil-wheat system. These results help to elucidate the comprehensive effects of NPs with other pollutants on the soil-plant system and provide new perspectives for toxic mechanisms.
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Inorganic Chemistry Frontiers
·
2024
·
IF 6.1
Zhiqi Li,Jiawen Yan,Qiming Li,Ao Xu,Jianchao Sun,Yijing Wang,Xiaoyu Zhang,Xueqin Sun,Fuyi Jiang,Yanli Zhou
MoSe2 with a two-dimensional layer-like structure has been considered a promising anode material for sodium-ion batteries (SIBs) on account of its high capacity and rich reserves on Earth. However, the inherent low conductivity of 2H-MoSe2, as well as the inevitable volume fluctuation during cycling, causes structural collapse and capacity decline, resulting in poor rate capability and unacceptable cycling stability. To improve the sodium storage properties of 2H-MoSe2, the Te doping strategy has been adopted to successfully synthesize Te doped 1T/2H-MoSe2 nanosheets (Te-MoSe2) via a facile two-step reaction. The Te doping induces the phase transition of 2H-MoSe2 to form 1T-MoSe2, which can improve the electron conductivity and generate more active sites, benefiting the promotion of sodium storage capacity. Besides, the 1T/2H heterogeneous interface accelerates the charge transfer kinetics. Thus, as an innovative anode material for sodium-ion half batteries, Te-MoSe2 exhibits better sodium storage performances than pure MoSe2. The full batteries composed of the Te-MoSe2 anode and Na3V2(PO4)3@rGO cathode also deliver remarkable electrochemical performances. The related kinetics results confirm the excellent electron transfer efficiency and rapid Na+ diffusion behavior of Te-MoSe2. Moreover, the reaction mechanism has also been elucidated by some ex situ characterization techniques. The good reversibility and excellent sodium storage properties of the Te-MoSe2 electrode indicate its potential application in future energy storage fields.
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Advanced Optical Materials
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2024
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IF 8
Zhongyuan Guan,Yang Huang,Zhaojin Wang,Jiayun Sun,Chengwei Shan,Yiguo Xu,Dan Wu,Aiwei Tang,Xiao Wei Sun,Kai Wang
The development of cadmium-free blue quantum dots (QDs) is of paramount importance to the display industry. In this study, high-quality ZnSeTe/ZnSe/ZnS blue QDs, followed by surface treatment with ZnI 2 are initially synthesized. The introduction of ZnI 2 passivated the surface defects, resulting in an increase in the fluorescence quantum yield. The time-resolved photoluminescence (TRPL) demonstrates a significant inhibition of non-radiative recombination associated with the surface defect state. The density functional theory (DFT) calculation reveals that the binding energy between iodine ions and zinc ions is higher than that between oleate ions and zinc ions, providing a theoretical basis for the effective passivation of the suspended bonds of zinc ions on QDs' surface by iodine ions. Moreover, quantum dot light-emitting diodes (QLEDs) are fabricated and UV photoelectron spectra (UPS) indicate the hole injection barrier between the hole transport layer and QDs decreases 0.12 eV after QDs being treated by ZnI 2 , facilitating hole injection. Finally, The ZnI 2 -treated QLED demonstrates a 1.57-fold and 1.82-fold improvement in L max and EQE max , respectively, reaching 6370 cd m −2 and 9.1%, compared to the pristine QLED. The work serves as a valuable reference for enhancing the performance of cadmium-free blue QLED.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Yu-Lin Zhong,Bing-Bing Wang,Kai-Fei Chu,Ai-Jun Wang,Tiejun Zhao,Jiu-Ju Feng
Although nanozyme-mediated chemodynamic therapy (CDT) has been extensively investigated, its therapeutic efficacy is hindered by tumor microenvironment (TME), which features low endogenous H 2 O 2 level and high glutathione (GSH) concentration. In this work, PtFeCoMoMn high-entropy intermetallic alloy/N-doped carbon nanoflowers (HEIA/NCNFs) was synthesized by a one-step pyrolysis. The HEIA/NCNFs exhibited multiple peroxidase (POD)-, catalase (CAT)-, oxidase (OXD)-, glutathione oxidase (GSHOx)-, and NADPH oxidase (NOX)-like activities, which were integrated with glucose oxidase (GOx) and doxorubicin (DOX) to establish a cascade nanotherapeutic platform (termed HEIA/NCNFs-GOx/DOX). Shortly, GOx consumed glucose in tumor cells, generating H 2 O 2 to compensate for the TME's H 2 O 2 deficiency. Subsequently, the HEIA/NCNFs converted H 2 O 2 into reactive oxygen species (ROS) via the POD/CAT/OXD-like activity. Also, the HEIA/NCNFs depleted intracellular GSH via its GSHOx-like activity, and simultaneously suppress GSH regeneration by consuming NADPH via its NOX-like activity, thereby inactivating glutathione peroxidase 4 and inducing ferroptosis. By combining starvation therapy, CDT, ferroptosis, and chemotherapy, the established cascade nanozyme system significantly enhanced the therapeutic efficacy of breast cancer, validated by the in vitro and in vivo studies. This multifunctional nanodrug improves therapeutic precision, reduces off-target effect, and advances the development of safe, efficient cancer treatments.
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FOOD CHEMISTRY
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2025
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IF 9.8
Xiaoxiao Dong,Chang Lu,Shuaijie Guo,Siqi Zhang,Xuelian Hu,Wenliu Wang,Yiwei Tang,Shuo Wang,Xiuying Liu
A magnetic NiFe 2 O 4 @TiO 2 @Au composite was successfully synthesized via layer-by-layer assembly approach and exhibited excellent SERS performance. The composite was functionalized with an aptamer modified with Cy3, serving as the Raman signal reporter, and was hybridized with complementary DNA oligonucleotides (cDNA) to construct the NiFe 2 O 4 @TiO 2 @Au@ssDNA SERS aptasensor. This aptasensor enabled the development of a sensitive, specific, and straightforward SERS assay for acetamiprid detection, exhibiting good accuracy. Under optimized conditions, an inverse correlation was established between the acetamiprid concentration and the Raman intensity at the characteristic peak of 1132 cm −1 , spanning a range of 10 −1 -10 4 nmol/L with a LOD of 8.4 × 10 −1 pmol/L. Standard addition experiments to three types of leafy vegetables samples yielded recoveries ranging from 94.30 % to 111.83 %, with a relative standard deviation of <5.56 %. This method shows potential for detecting other hazardous substances in food and environmental samples by simply changing the corresponding aptamers and cDNA.
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ANALYTICA CHIMICA ACTA
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2024
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IF 5.7
Manting Li,Haikun Luo,Zhao Wang,Qian Mo,Shanshan Zhong,Yu-ang Mao,Shuting Li,Xinchun Li
Background Assembling framework nucleic acid (FNA) nanoarchitectures and tuning luminescent quantum dots (QDs) for fluorescence assays represent a versatile strategy in analytical territory. Rationally, FNA constructs could offer a preferential orientation to efficiently recognize the target and improve detection sensitivity, meanwhile, regulating size-dependent multicolor emissions of QDs in one analytical setting for ratiometric fluorescence assay would greatly simplify operation procedures. Nonetheless, such FNA/QDs-based ratiometric fluorescence nanoprobes remain rarely explored. Results We designed a sensitive and signal amplification-free fluorescence aptasensor for lead ions (Pb 2+ ) that potentially cause extensive contamination to environment, cosmetic, food and pharmaceuticals. Red and green emission CdTe quantum dots (rQDs and gQDs) were facilely prepared. Moreover, silica nanosphere encapsulating rQDs served as quantitative internal reference and scaffold to anchor a predesigned FNA and DNA sandwich containing Pb 2+ binding aptamer and gQD modified DNA signal reporter. On binding of Pb 2+ , the gQD-DNA signal reporter was set free, resulting in fluorescence quenching at graphene oxide (GO) interface. Owing to the rigid structure of FNA, the fluorescence signal reporter orderly arranged at the silica nanosphere could sensitively respond to Pb 2+ stimulation. The dose-dependent fluorescence signal-off mode enabled ratiometric analysis of Pb 2+ without cumbersome signal amplification. Linear relationship was established between fluorescence intensity ratio ( I 555 / I 720 ) and Pb 2+ concentration from 10 nM to 2 μM, with detection limit of 1.7 nM (0.43 ppb), well addressing the need for Pb 2+ routine monitoring. The designed nanoprobe was applied to detection of Pb 2+ in soil, cosmetic, milk, drug, and serum samples, with the sensitivity comparable to conventional ICP-MS technique. Significance Given the programmable design of FNA and efficient recognition of target, flexible tuning of QDs emission, and signal amplification-free strategy, the present fluorescence nanoprobe could be a technical criterion for other heavy metal ions detection in a straightforward manner.
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Small Structures
·
2024
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IF 13.9
Zhenliang Li,Yujian Rao,Zhehan Wang,Tuo Zhang,Guodong Wu,Litao Sun,Yuan Ren,Li Tao
Two-dimensional (2D) transition metal dichalcogenides (TMDs) are widely used in interfacial reactions and electronic devices due to their tunable bandgap and high efficiency of carrier transport. However, the lack of fully exposed active sites in bulk samples or stacked nanosheets leads to limited performances. In this work, a general method is developed to construct ordered mesoporous TMDs/metal oxides (OM-TMDs/MOs) heterostructures, including WS 2 /WO 3 , WSe 2 /WO 3 , WTe 2 /WO 3 , MoS 2 /MoO 3 , and V 3 S 4 /V 2 O 3 , through one-step thermal sulfurization (selenidation/tellurization) of self-assembled amphiphilic block copolymer/polyoxometalates clusters nanocomposites with ordered mesostructures. The OM-TMDs/MOs possess highly OM structures with high specific surface area, large pore size, and rich active edge sites in the frameworks of heterostructures. The chemiresistive gas sensor based on OM-WS 2 /WO 3 shows excellent NO 2 -sensing performances at room temperature, with high sensitivity, ultrahigh selectivity ( S NO 2 $S_{\left(\text{NO}\right)_{2}}$ / S gas > 20), and fast response speed (6 s). Theoretical study reveals that the strong adsorption capacity of WS 2 /WO 3 heterostructure and edge sites of WS 2 for NO 2 molecules and the high charge transfer between them contribute to high selectivity and sensitivity of the sensor. This universal method provides novel strategy for synthesis of OM TMDs-based nanomaterials, showing great potential in various applications such as electronic devices, catalysis, energy storage, and conversions.
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ACS Nano
·
2025
·
IF 16
Fushou Liu,Tao Tang,Jian Guo,Wendi Xu,Fangtao Tan,Linfeng Wang,Mingxi Zhang,Ran Cui
Inflammatory bowel disease (IBD) is a common chronic gastrointestinal inflammatory disease with an increasing global incidence. However, a significant challenge in IBD management lies in the coordination between high stability and targeting properties of diagnostic and therapeutic agents. Here, we engineer near-infrared-IIb (NIR-IIb) fluorescent nanozymes with pH-responsive surface charge flipping ability for imaging-guided therapy of IBD. The nanozymes exhibit protonation-induced positive charge (+2.6 mV) in gastric acid for enhanced stability, switching to negative charge (−7.2 mV) in intestinal fluid for targeted accumulation. Therefore, these NIR-IIb fluorescent nanozymes could markedly bypass gastric acid barriers and target damaged colon tissue, revealing a significant NIR-IIb signal in early-stage IBD models versus the control. Meanwhile, Mn doping confers a reactive oxygen species scavenging ability, alleviating inflammation in colitis mice. This dual-functional platform overcomes gastrointestinal barriers, enabling precise lesion targeting and therapy monitoring and offering a promising strategy for personalized IBD management.
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