ACS Applied Electronic Materials
·
2025
·
IF 4.7
Ruifeng Wu,Yi Liu,Donglin He,Hao Sun,Yafei Liu,Jia Chen,Aimin Chang,Bo Zhang
Coordinated regulation of electrical transport and high-temperature stability of BaSm2Ti4O12-δ is essential for achieving precise temperature measurements in high-temperature thermistors. However, at higher temperatures, the increasing oxygen vacancies in BaSm2Ti4O12-δ trigger a self-compensation effect that drives the delocalization of localized electronic states. This mechanism consequently induces deviation from the Arrhenius equation in the resistivity-temperature relationship. Herein, we propose a codoping strategy to suppress the high-temperature self-compensating effect of BaSm2Ti4O12-δ. The codoping strategy comprises (i) substitutional incorporation of Tb3.5+ (average valence) at Sm3+ sites to modulate oxygen vacancy concentration through charge compensation mechanisms and (ii) isovalent Zr4+ doping into Ti4+ sites to suppress Ti3+ formation via stabilization of the Ti-site oxidation state. The results indicate that introducing Zr, in conjunction with a Tb doping amount of 0.2 (BaTb0.2Sm1.8ZrxTi4–xO12-δ), enhances the linear fitting coefficient of the resistance–temperature curve from 99.867% to 99.994% and reduces the aging drift rate from 86.45% to 3.1%. Additionally, the temperature coefficient of resistance (α1000 °C) ranges from −0.89 to −1.18%/°C. (Tb, Zr) codoping improves the linearity of the resistance–temperature curve and the high-temperature stability of BaTb0.2Sm1.8ZrxTi4–xO12-δ ceramics. This synergistic optimization offers insights for designing effective dopants in high-temperature thermosensitive materials.
研究领域:
材料科学
·
陶瓷与复合材料
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电子材料
·
热电性能
·
固态化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2015
·
IF 5.33
Xiaolei Zhang,Jingjing Deng,Yumeng Xue,Guoyue Shi,Tianshu Zhou
In this study, we demonstrate a colorimetric and fluorescent dual-mode method for alkaline phosphatase activity (APA) sensing in freshwater lake with stimuli-responsive gold nanoparticles@terbium-guanosine monophosphate (Au-NPs@GMP-Tb) core–shell nanoparticles. Initially, the core–shell nanoparticles were fabricated based on Au-NPs decorated with a fluorescent GMP-Tb shell. Upon being excited at 290 nm, the as-formed Au-NPs@GMP-Tb core–shell nanoparticles emit green fluorescence, and the decorated GMP-Tb shell causes the aggregation of Au-NPs. However, the addition of ALP destroys GMP-Tb shell, resulting in the release of Au-NPs from the shell into the solvent. As a consequence, the aggregated Au-NPs solubilizes with the changes in the UV–vis spectrum of the dispersion, and in the meantime, the fluorescence of GMP-Tb shell turns off, which constitutes a new mechanism for colorimetric and fluorescent dual-mode sensing of APA. With the method developed here, we could monitor the dynamic change of APA during an algal bloom of a freshwater lake, both by the naked eye and further confirmed by fluorometric determination. This study not only offers a new method for on-site visible detection of APA but also provides a strategy for dual-mode sensing mechanisms by the rational design of the excellent optical properties of Au-NPs and the adaptive inclusion properties of the luminescent infinite coordination polymers.
研究领域:
环境科学
·
分析化学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
TALANTA
·
2018
·
IF 4.244
Sobia Niazi,Xiaole Wang,Imran Pasha,Imran Mahmood Khan,Sen Zhao,Muhammad Shoaib,Shijia Wu,Zhouping Wang
Zearalenone (ZEN) is a non-steroidal estrogenic mycotoxin produced by fungi on stored grains. The earlier detection methods used for ZEN rely on expensive equipment, time-consuming sample preparation and temperature sensitive antibodies. The current work, proposed a novel strategy based on ZEN aptamer labeled with amine-functionalized magnetic nanoparticle (MNPs) as a capture probe and time-resolved fluorescence (TRFL) nanoparticles labeled with complementary DNA (cDNA) as a signal probe. Under the optimized conditions, TRFL intensity at 544 nm was used to measure ZEN (R 2 = 0.9920) in the range of 0.001–10 ng mL −1 and limits of detection (LOD) for proposed method was 0.21 pg mL −1 . The specificity of bioassay was also determined by using other mycotoxins (OTA, AFB 2 , DON and Patulin) and results showed that the aptamer are specific to recognize only ZEN. The analytical applications of the present bioassay in maize and wheat samples were also examined and results were compared with existing methods. Based on these findings, it is suggested to use current rapid and simple bioassay for the determination of ZEN in food and agricultural products.
研究领域:
食品科学
·
分析化学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Jianbo Liu,Yonghui Shang,Jinqiong Xu,Yi Chen,Yarong Jia,Jianbin Zheng
Carcinoembryonic antigen (CEA) is a typical biomarker for lung cancer. It is very urgent to develop a sensitive and rapid method to assay CEA content in human serum. In this work, Cu-MOFs nanomaterials were synthesized by a hydrothermal method . Toluidine blue (TB) loaded mesoporous Cu-MOFs with polydopamine (PDA) coating were employed as a signal probe. The proposed sandwich immunosensor was fabricated by Cu-MOFs-TB/PDA, chitosan and MWCNTs on the glassy carbon electrode with a large surface area to immobilize primary antibodies (Ab 1 ) and provide excellent conductivity. The sensitivity improvement of this new strategy was based on the destruction of the probe and the immune complex by HCl, which resulted in the closer distance between TB and the sensing electrode. Under optimal conditions, CEA was quantitatively detected with a wide linear range from 20 fg mL −1 to 200 ng mL −1 , a low detection limit of 3.0 fg mL −1 (S/N = 3). In addition, the method showed good stability, selectivity, and reproducibility, which possessed wide potential applications for the detection of other tumour biomarkers.
研究领域:
分析化学
·
生物标志物检测
·
纳米技术
·
电化学
·
癌症诊断
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2022
·Vol. 14
·期 11
·4263-4270
·
IF 8.307
Kunlun Liu,Jun Zhao,Gencai Pan,Yaxian Zhu,Wenwu You,Huafang Zhang,Huiping Gao,Yanli Mao
Lead halide perovskite quantum dots (PQDs) are extremely unstable when exposed to oxygen, water and heat, especially red CsPbBrxI3−x (x = 0, 0.5, 1.2) PQDs. This seriously hinders their practical application. Here, red CsPbBrxI3−x (x = 0, 0.5, 1.2) PQDs have been successfully encapsulated in porous CaF2:Ce,Tb hierarchical nanospheres (HNSs), which not only greatly improved the stability of PQDs, benefitting from the protection of the CaF2 shell, but also maintained the high photoluminescence quantum yield (PLQY) of PQDs, benefitting from the sensitization of Tb3+ ions. More importantly, porous CaF2:Ce,Tb nanoarchitectures can prevent aggregation quenching and anion exchange of PQDs. Therefore, the CaF2:Ce,Tb&CsPbBrxI3−x (x = 0, 0.5, 1.2) composite powder can have high PLQY comparable to that of the PQD powder. In view of this, CaF2:Ce,Tb&CsPbBr1.2I1.8 composite based red light-emitting diodes (LEDs) are prepared, and they are very suitable as a supplementary light source for plant lighting. Furthermore, white LEDs are also prepared by coating the CaF2:Ce,Tb&CsPbBr3 and CaF2:Ce,Tb&CsPbBr1.2I1.8 composite on a 450 nm chip. The optimum luminous efficiency is 61.2 lm W−1, and the color rendering index is 91, which are comparable to the current highest values. This shows that the composite composed of PQDs has great potential in LED lighting.
研究领域:
材料科学
·
纳米技术
·
光电技术
·
光子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Junya Song,Beibei Zhao,Yiren Wang,Xinfang Liu,Zheng Cheng,Xiaoyu Zhang,Xun Feng
In this study, a new Tb-MOF fluorescence probe was developed for the detection of malachite green (MG) in real aquatic products. Fluorescence sensing experiments revealed that MG can effectively quench the green fluorescence of Tb-MOF suspensions, and the detection process exhibits the advantages of high sensitivity, a wide linear range (0–80 μM), a low detection limit (10.8 nM) and a rapid response time. Selective detection of MG is achieved primarily through fluorescence resonance energy transfer (FRET) and photoinduced electron transfer (PET) mechanisms. Furthermore, a smartphone-assisted Tb-MOF-based agar slice detection platform was constructed for the visual and quantitative detection of MG. Additionally, the on-site detection of MG in crucian and shrimp samples was accomplished with high recoveries (99.8 %-107.99 %) and low relative standard deviations (RSD < 2.2 %). This developed detection platform introduced a low-cost, portable and user-friendly approach for MG detection.
研究领域:
分析化学
·
环境科学
·
食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF RARE EARTHS
·
2024
·
IF 5.2
Chen Di-Ming,Han-Dong Qiao,Shao-Ming Fang
Introduction of porosity and fluorescent properties into lanthanide metal–organic frameworks (MOFs) with rational design to achieve multifunctional use is of great significance from the energy and environmental viewpoint. In this study, a microporous Tb(III)-based MOF with the formula of {[Tb 2 (oba) 3 (Phen) 2 ](DMF) 2 (H 2 O) 4 } n ( 1 ) was solvothermally prepared via using the mixed ligands of 1,10-phenanthroline (Phen) and 4,4′-oxybis(benzoic acid) (H 2 oba) as organic connecters. The structural evaluation results indicate that complex 1 is composed of binuclear Tb 2 (CO 2 ) 6 (Phen) 2 clusters which are extended by the oba 2− ligands to afford a two-fold interpenetrated framework with one-dimensional microporous channels along the b -axis. Gas sorption studies show that the activated 1 demonstrates a high ideal adsorption solution theory (IAST) sorption selectivity of 7.4 toward C 2 H 2 in a C 2 H 2 /CO 2 gas mixture, which are further supported by the dynamic breakthrough experiments. The grand canonical Monte Carlo (GCMC) simulation results indicate that the synergistic effects of the H-bond interactions of C 2 H 2 with oba 2− ligands and the C–H···π interactions with Phen ligand contribute to the strong binding of the framework toward C 2 H 2 molecules. What's more, the luminescent measurements reveal that the emission of 1 features both the characteristic peaks of Phen ligand and Tb(III) ion, which could be further applied as a self-calibrating sensor for the Cr(VI) detection in water. To the best of our knowledge, complex 1 represents the first example of Tb-MOF holding such a high C 2 H 2 /CO 2 selectivity together with ratiometric Cr(VI) detection performances.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Yajing Cai,Guojie Zhang,Jun Liu,Yunfei Zhang,Tianshan Li,Xiaodi Zhang,Ying Wang,Yuqiong Zhao,Guoqiang Li
Dry reforming of methane (DRM) is an effective method for achieving carbon reduction and carbon neutrality by directly converting two greenhouse gases , CH 4 and CO 2 , into value-added products. However, catalysts used in this process are prone to metal sintering and carbon deposition , which are major obstacles. Thus, the design of high-performance catalysts is crucial for the success of dry reforming technology. In this paper, a series of Co-based catalysts modified with different rare earth metals (Y, Tb, Gd) and γ-Al 2 O 3 as the support were prepared using the conventional co-impregnation method. The effects of the introduction of rare earth metals additives on the activity and resistance to carbon build-up of the catalysts were investigated. The catalysts were analyzed using various characterization techniques. The results showed that Y and Tb as additives could effectively improve the activity and stability of the catalyst. However, the Gd modified Co-based catalyst had a large specific surface area but was less favorable for the DRM reaction. The best performance catalyst was achieved with the 10Co–5Y/γ-Al 2 O 3 under 750 °C with CH 4 and CO 2 conversions of 91.79% and 98.33%, respectively. This is mainly due to the fact that the introduction of Y enhances the electron transfer between Co and metal oxides , generating more oxygen vacancies and base vacancies on the surface, thus enhancing the adsorption and activation of CO 2 . The 10Co–5Y/γ-Al 2 O 3 catalyst demonstrated excellent DRM performance even after 20 h at 750 °C. Moreover, we proposed a hypothesis regarding the mechanism of resistance to carbon build-up. This study provides a reasonable idea to design Co-based catalysts with resistance to sintering and carbon accumulation to improve the performance of reforming catalysts.
研究领域:
催化
·
化学工程
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
POLYHEDRON
·
2024
·
IF 2.4
Jian Gou,Luxin Xing,Yousong Hu,Lina Zhang,Yongxin Li,Ning Bi,Yuanyuan Huang,Jun Xu,Lei Jia
A polychromatic fluorescent nanoprobe based on natural halloysite nanotubes with fluorescent dyes and porous metal–organic frameworks co-loaded on the surface and inner wall of the nanotubes was constructed for the highly sensitive visual identification of the Bacillus anthracis biomarker 2,6-dichlorophenolic acid (DPA). The limit of detection for DPA was 11.27 nM, which is significantly lower than the spore-borne dose for anthrax infection (60 uM). The multi-color fluorescent probe showed potential for rapid, accurate, and highly selective detection of Bacillus anthracis markers in actual samples. Besides, a portable fluorescence detection platform was developed in combination with a smartphone color scanning APP to simplify the detection process and realize real-time semi-quantitative analysis.
研究领域:
纳米技术
·
生物技术
·
分析化学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2024
·
IF 5.6
Yi Xiao,Pengcheng Huang,Fang-Ying Wu
α-Glucosidase, which directly involves in the metabolism of starch and glycogen and causes an increase in blood sugar level, is the major target enzyme for the precaution and therapy of type II diabetes. Based on the previous work, we adopted a post-synthetic modification method to encapsulate Tb 3+ into Ce-MOF nanozyme which owned mixed valence states. Tb@Ce-MOF displayed induced luminescence characteristic and exceptional oxidase-like activity that could oxidize colorless 3,3′,5,5′-tetramethylbenzidine (TMB) to blue ox-TMB. α-Glucosidase can hydrolyze the substrate l -ascorbic acid-2- O -α- d -glucopyranosyl (AAG) to generate ascorbic acid (AA), which could increase the Ce 3+ /Ce 4+ redox valence mode in Tb@Ce-MOF, leading to the inhibition of the allochroic reaction of TMB and the decreased absorption of ox-TMB at 652 nm. The energy transfer (EnT) process from Ce 3+ to Tb 3+ will enhance due to the increased Ce 3+ /Ce 4+ mode in Tb@Ce-MOF, which will result in an enhanced fluorescence signal of Tb@Ce-MOF at 550 nm. But the addition of inhibitor acarbose will inhibit the above process. We have constructed a dual-mode detection platform of α-glucosidase and its inhibitor via colorimetric and fluorometric method. The linear range of α-glucosidase were 0.01–0.5 U/mL (colorimetric mode) and 0.8–1.5 U/mL (fluorometric mode), respectively, with a detection limit as low as 0.0018 U/mL. Furthermore, our approach was also successfully employed to the analysis of α-glucosidase in serum samples.
研究领域:
分析化学
·
生物化学
·
材料科学
·
糖尿病研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 10
·4021-4027
·
IF 4.58
Wang Xiaole,Niazi Sobia,Yukun Huang,Sun Weijia,Wu Shijia,Duan Nuo,Hun Xu,Wang Zhouping
The authors describe an aptasensor based on time-resolved fluorescence resonance energy transfer (TR-FRET) for the identification of Salmonella typhimurium ( S. typhimurium ). Aptamer-functionalized nanoparticles (NPs) is used as the energy donor, and a complementary oligonucleotide (cDNA) labeled with carboxyfluorescein (FAM) acts as the acceptor. The detection scheme is based on the hybridization between aptamer and cDNA, upon which photonic energy is transferred from NPs to FAM unless aptamer interacts with S. typhimurium . Due to the highly specific recognition ability of aptamer and the strong fluorescence intensity of NPs, the method is highly sensitive and selective for S. typhimurium . Under the optimal conditions, at excitation wavelength of 273 nm, a delay time of 100 μs and a gating time of 1 ms, the integrated time-resolved fluorescence intensity ratio (FAM 520 /Tb 489 ) is linear in the 100 to 10 6 cfu·mL −1 range, and the limit of detection is as low as 25 cfu·mL −1 . The assay was applied to the analysis of eggs and chicken meat for S. typhimurium , and the results were consistent with those of a plate-counting method.
Schematic of a homogeneous time-resolved FRET assay for the determination of Salmonella typhimurium by FRET between NaYF 4 :Ce/Tb nanoparticle-tagged aptamer and FAM-cDNA, with a good linearity and the limit of detection of 25 cfu mL −1 .
研究领域:
微生物学
·
纳米技术
·
食品安全
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Min Chen,Zhengli Liang,Xiaoxiao Wang,Jiehua Li,Xingguo Chen,Xingxing Jiang,Zheshuai Lin,Zhen Ma,Hongming Liu
A series of lanthanide-containing water-resistant nitrates, namely RE(OH)2NO3 (RE = Tb(1), Dy(2), Ho(3), and Er(4)), was obtained through the hydrothermal process. As possible nonlinear optical materials, they feature a layered isomorph composed of an [REO3(OH)6] polyhedron and an [NO3] triangle, and the synergistic arrangement of the [REO3(OH)6] and [NO3] groups in their structures leads to their obvious second-order nonlinear optical effect. Nevertheless, the unique optical absorption caused by the electronic transitions on 4f–4f orbitals of lanthanides results in their second harmonic generation responses of different strengths, with 1 exhibiting 5.07 times that of KDP, but 2–4 showing less than half of KDP. In addition, 1 possesses an outstanding water-resistant capacity and a transparent cut-off edge around 300 nm, foreshadowing its potential value as a nonlinear optical crystal. Moreover, 1 is found to emit characteristic green fluorescence due to the typical 5D4 → 7F5 transitions of the excited Tb3+ ions
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）