CHEMISTRY OF MATERIALS
·
2018
·
IF 9.89
Fei Li,Ying Liu,Hongliang Wang,Qian Zhan,Quanlin Liu,Zhiguo Xia
The control of surface properties of all inorganic cesium lead halide perovskite (CsPbX3; X = Cl, Br, or I) quantum dots (QDs) is essential to achieve excellent stability and high photoluminescence quantum yields (PLQYs). Herein, a facile method was performed to simultaneously enhance the stability and PLQYs of CsPbX3 QDs by a ZnX2/hexane solution post-treatment. We show that the halogen defect on the surface of CsPbX3 QDs can be treated in a controlled way, whereby the “black dots” that adhered on the surface as observed by transmission electron microscopy have be completely removed, resulting in enhanced stability and photoluminescence. The PLQYs of CsPbCl3, CsPbBr3, and CsPbI3 increased from 4, 58, and 63% to 86, 93, and 95%, respectively, and the origin of the “black dots” as well as their transformation mechanism has been demonstrated. As a result, the poly(dimethylsiloxane) composite films created by encapsulating stable and nearly defect-free green-emitting CsPbBr3, the red-emitting K2SiF6:Mn4+ phosphor, and a blue emission GaN chip were prepared and used to fabricate a remote-type white light-emitting diode device, which exhibits a high luminescence efficiency (≤98 lm/W) and a wide color gamut (∼130% of the National Television Standard Committee standard), suggesting the potential for liquid crystal display backlight application.
研究领域:
材料科学
·
光学
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产品关联
DOI
高影响因子
Research
·
2022
·
IF 11.036
Jiayu Di,Haojin Li,Li Chen,Siyu Zhang,Yinhui Hu,Kai Sun,Bo Peng,Jie Su,Xue Zhao,Yuqi Fan,Zhenhua Lin,Yue Hao,Peng Gao,Kui Zhao,Jingjing Chang
Exploring halogen engineering is of great significance for reducing the density of defect states in crystals of organic-inorganic hybrid perovskites and hence improving the crystal quality. Herein, high-quality single crystals of PEA2PbX4 (X = Cl, Br, I) and their para-F (p-F) substitution analogs are prepared using the facile solution method to study the effects of both p-F substitution and halogen anion engineering. After p-F substitution, the triclinic PEA2PbX4 (X = Cl, Br) and cubic PEA2PbX4 (X = I) crystals unifies to monoclinic crystal structure for p-F-PEA2PbX4 (X = Cl, Br, I) crystals. The p-F substitution and halogen engineering, together with crystal structure variation, enable the tunability of optoelectrical properties. Experimentally, after the p-F substitution, the energy levels are lowered with increased Fermi levels, and the bandgaps of p-F-PEA2PbX4 (X = Cl, Br, I) are slightly reduced. Benefitting from the enhancement of the charge transfer and the reduced trap density by p-F substitution and halogen anion engineering, the average carrier lifetime of the p-F-PEA2PbX4 is obviously reduced. Compared with PEA2PbI4, the X-ray detector based on p-F-PEA2PbI4 perovskite single-crystal has a higher sensitivity of 119.79 μC Gyair-1·cm-2. Moreover, the X-ray detector based on p-F-PEA2PbI4 single crystals exhibits higher radiation stability under high-dose X-ray irradiation, implying long-term operando stability.
研究领域:
材料科学
·
光电材料
·
辐射探测
✓ 已验证
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 52
·38634-38644
·
IF 3.9
Nazifi Sani Shuaibu,Gaosheng Zhao,Fengjian Chu,Balarabe Bilyaminu Ismail,Aso Ali Abdalmohammed Shateri,Anas Abdullahi Muhammad,Ammar Muhammad Ibrahim,Musbahu Garba Indabawa,Xiaozhi Wang
Water scarcity is a global concern that needs addressing through alternative sources. One of the approaches is the use of reclaimed water for irrigation. However, the presence of halogenated compounds and heavy metals in reclaimed water poses significant food safety threats. Therefore, a comprehensive characterization of these contaminants using a reliable method is essential. This study presents an innovative analytical technique that combines electrospray ionization (ESI) with microwave plasma ionization mass spectrometry (MPIMS), enabling the simultaneous detection of organic compounds and heavy metals. The plasma ionization process in metals exhibits novel features, unlike traditional methods, making it suitable for organic and metallic detection in complex matrices. This technique achieved a recovery rate of 78.5–123% and 79.93–119.50% for halogenated compounds and heavy metals, respectively. The limits of detection and quantification ranged from 1.5 ng mL−1 to 3.5 ng mL−1 and 4.5 ng mL−1 to 12.75 ng mL−1, respectively. Analysis of reclaimed water from three irrigation systems revealed concentrations of halogenated compounds and heavy metals below allowable levels set by national agencies, indicating manageable pollution risks. H-compounds, such as diuron and linuron, were prevalent in all samples, while zinc and lead showed higher levels in flood and sub-irrigation systems. Compared to traditional methods, ESI-MPIMS performs well and demonstrates high efficiency, good quantification, and high sensitivity in the analysis of real samples. This study shows that ESI-MPIMS is promising for on-site analysis of organic compounds and heavy metals in complex matrices and is suitable for water quality control and environmental quality assessment for pollutant screening.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Wenqian Xu,Dangli Gao,Xiangyu Zhang,Wenna Gao,Dingjun Jia,Yuhua Wang
Persistent luminescence (PersL) materials are extensively utilized in areas such as emergency lighting and information storage, but their performance is generally optimized at room temperature and degrades significantly under high-temperature conditions. Herein, a serials of Mg 2 GeO 4 :Ti 4+ ,Ln 3+ (Ln = Tb, Eu) phosphors demonstrate anomalous thermal quenching PersL due to the temperature-dependent Fermi-Dirac distribution of bound charge carriers of Ti 4 + Mg 2 + as remote electron traps and V M g 2 + ${{\mathrm{V}}_{{\mathrm{M}}{{\mathrm{g}}^{2 + }}}}$ as hole traps. The high carrier retention rate is attributed to the ability of Ti 4 + Mg 2 + positive charge center to strongly trap non-bonding electrons over a long range (about 20 Å) as the electronic satellite for its stable operation. Under external optical/thermal stimulation, the released electrons and holes recombine at the different luminescent levels of Tb 3+ , giving rise to PersL emission with different branching ratios. Based on these phosphors, a five-dimensional (5D) optical storage (encoding information in 2D space, trap depth, temperature, and time dimensions) and the encrypted engine program for high-temperature aerospace engines are developed. This study elucidates the long-range electron-trapping and release processes mediated by Ti 4+ centers, offering a new design concept for advanced PersL materials.
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DOI
高影响因子
ANALYTICAL LETTERS
·
2023
·
IF 2
Jie Xie,Wei Wan,Keke Yi,Ziyu Qu,Di Zhang,Zejian Huang,Zihong Ye,Xinhua Dai,You Jiang,Xiang Fang
Accurate measurement of endogenous steroid hormones in serum is a powerful tool for understanding the status of human adrenal diseases. Isotope dilution–liquid chromatography–tandem mass spectrometry is the most commonly used method for determination of steroids in serum. In this study, we used a laboratory-constructed quadrupole-linear ion trap (Q-LIT) tandem mass spectrometer to develop a new method for the quantification of five steroid hormones in serum. A simple and efficient pretreatment was improved, wherein the serum was extracted once by a mixed solvent of 1.0 mL of ethyl acetate and n-hexane. Using the optimized method, the regression coefficients of the calibration curves were all higher than 0.99, the limits of detection were from 0.31 to 1.25 ng mL−1, and the limits of quantification were between 1.00 and 2.50 ng mL−1. The intra-day (n = 3) relative standard deviations ranged from 4.24% to 13.79%, and the inter-day (n = 3) relative standard deviations from 3.99% to 11.43%. After internal standard correction, the relative recoveries of all steroids were from 86.08% to 106.60%. Twenty-two serum samples were analyzed by Q-LIT, which was compared with commercial triple quadrupole mass spectrometer. The results of the instruments had high consistency. Therefore, Q-LIT accurately quantified steroid hormones in human samples and may be used for clinical diagnosis and monitoring of hormone-dependent diseases.
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产品关联
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2013
·
IF 2.906
Dan Wan,Lingli Huang,Yuanhu Pan,Qinghua Wu,Dongmei Chen,Yanfei Tao,Xu Wang,Zhenli Liu,Juan Li,Liye Wang,Zonghui Yuan
Dispositions of deoxynivalenol (DON) in rats and chickens were investigated, using a radiotracer method coupled with a novel γ-accurate radioisotope counting (γ-ARC) radio-high-performance liquid chromatography ion trap time-of-flight tandem mass spectrometry (radio-HPLC-IT-TOF-MS/MS) system. 3β-3H-DON was chemically synthesized and orally administrated to both sexes of rats and chickens as single or multiple doses. The results showed that DON was widely distributed and quickly eliminated in all tissues. The highest concentration was found in the gastrointestinal tract at 6 h post-administration. Substantially lower levels were detected in the kidney, liver, heart, lung, spleen, and brain. Three new metabolites were identified tentatively as 10-deoxynivalenol-sulfonate, 10-deepoxy-deoxynivalenol (DOM-1)-sulfonate, and deoxynivalenol-3α-sulfate. Deoxynivalenol-3α-sulfate was a major metabolite in chickens, while the major forms in rats were DOM-1 and DON. Additionally, a higher excretion rate in urine was observed in female rats than in male rats. The differences in metabolite profiles and excretion rates, which suggested diverse ways to detoxify, may relate to the different tolerances in different genders or species.
研究领域:
毒理学
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分析化学
·
食品科学
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产品关联
DOI
PubMed
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2023
·Vol. 415
·期 26
·6399-6410
·
IF 4.3
Jiang Maoyuan,Hua Shiyao,Zou Liang,Wang Yitao,Li Peng
Huangqi Guizhi Wuwu decoction (HGWD), as a classical formula, has been used for thousands of years in China. In this work, a comprehensive strategy was proposed for characterizing the chemical profile of HGWD based on online two-dimensional hydrophilic interaction and reversed-phase liquid chromatography coupled with hybrid linear ion trap-Orbitrap mass spectrometry (online HILIC × RP-ESI/HRMS/MS n ). The compounds in HGWD were first separated by the combined use of an XBridge amide column (150 × 4.6 mm, 3.5 μm) and Accucore C18 column (50 mm × 4.6 mm, 2.6 μm). Modulation with assistant technology, including trap columns and online dilution, was optimized and developed to decrease potential analyte loss and improve the resolution of the system. Subsequently, the accurate mass was determined by high-resolution Orbitrap and MS n fragment data by a hybrid linear ion trap (LTQ). In total, 170 chemical constituents were unambiguously identified or tentatively characterized in both positive and negative ion modes. Our study demonstrated that the proposed online HILIC × RP system coupled to the LTQ-Orbitrap MS platform is an efficient analytical technique for characterizing the chemical profile of multicomponent systems.
研究领域:
分析化学
·
药物分析
·
中医药学
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质谱分析
·
色谱分析
✓ 已验证
DOI
高影响因子
Food Chemistry-X
·
2024
·
IF 6.5
Yun Wu,Meiqi Wang,Ying Gu,Kun Ge
Herein, the miniaturized thermal purge-and-trap (MTPT) device combined with self-calibration colorimetric/surface-enhanced Raman spectroscopy (SERS) dual-model optical sensors were designed for effective analysis of sulfur dioxide (SO 2 ) in wine. The SO 2 can be rapidly separated from wine and enriched by MTPT device, ensuring colorimetric/SERS dual-model optical sensing based on Karl Fischer reaction. The high separation efficiency of miniaturized MTPT device combined with self-calibration of dual-model optical sensors significantly alleviate matrix interference and improve the detection accuracy. The satisfactory linear range of 0.1–200.0 mg/L and 0.1–500.0 mg/L with limit of detection of 0.03 mg/L can be obtained. Finally, the MTPT-colorimetric/SERS method was applied to determine the content of SO 2 in different kinds of wine to verify the practicality. These results provide an ideal strategy in construction of MTPT device combined with self-calibration dual-model optical sensors for quantification of gaseous hazards in complex food samples with high rapidity, anti-interference and accuracy.
研究领域:
食品科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2017
·Vol. 40
·期 9
·1906-1919
·
IF 2.557
Chunguo Wang,Zhiquan Zheng,Xinqi Deng,Xiaojie Ma,Shengnan Wang,Jie Liu,Yong Liu,Jinli Shi
Valeriana jatamansi Jones is an important medicinal plant and its quality is closely related to its region of origin. In the current study, we utilized a flexible and powerful strategy for comprehensive evaluation of the quality diversity for 15 regions in China. The method was based on a hybrid linear ion trap-Orbitrap mass spectrometry platform. For structure characterization, fragmentation patterns were detected by analyzing a series of standard compounds using data dependent multistage mass spectrometry acquisition. A fragment ion database for valepotriates was established, and the acquired data were high throughput filtered by fragment ion search for compound identification. For quantitative purposes, we normalized the mass spectrometry data of 15 samples using SIEVE 2.0 and the differences in composition were analyzed using principal component analysis combined with hierarchical clustering analysis. The results identified a total of 92 compounds from Valeriana jatamansi Jones. Samples from Dali, Kunming, and Baoshan have better qualities and concentrations of the main active constituents. To verify our strategy, we compared the valtrate, acevaltrate, and baldrinal contents using high-performance liquid chromatography with diode array detector. We developed and validated a comprehensive qualitative and quantitative analytical method to achieve quality control of Valeriana jatamansi Jones.
研究领域:
药用植物学
·
分析化学
·
中药质量控制
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MASS SPECTROMETRY
·
2026
·Vol. 61
·期 4
·e70055
·
IF 2.1
Min Jae Kim,Xinyun Zhang,Zhao Yang,Xiaofan Fan,Hongjuan Pan,Zhihong Cheng
Cyclic dipeptides (CDPs), distinguished by a 2,5-diketopiperazine core, exhibit a broad spectrum of biological activities. The (un)targeted discovery of CDPs in complex matrices is therefore of considerable interest, and mass spectrometry (MS) offers unrivalled advantages: rapid analysis, high sensitivity, minimal sample consumption, and limited pre-treatment requirements. Yet, confident MS-based identification of CDPs has been hampered by the scarcity of authentic reference standards. To address this deficit, we undertook a systematic investigation of 21 CDPs isolated from the fungus Hormonema dematioides using ultra-performance liquid chromatography–electrospray ionization–linear ion trap multistage MS (UPLC–ESI–LIT-MS n ) in positive ion mode. Hierarchical MS 2 and MS 3 experiments afforded reproducible fragmentation pathways that unambiguously delineated the CDP nucleus and the constituent amino acid residues. For the first time, we herein proposed [M + H-17] + and [M + H-56] + as co-diagnostic ions for the 2,5-diketopiperazine scaffold, together with the previously reported [M + H-28] + , [M + H-45] + , and [M + H-73] + ions. Additionally, in contrast to previous reports, the [M + H-28] + ion consistently appeared as the base peak for the majority of CDPs examined. Amino-acid-specific fragments were found to be strictly dependent on the nature of the incorporated residues. These fragmentation rules were subsequently applied to the untargeted profiling of H. dematioides , enabling the identification or tentative annotation of 30 CDPs through combined UV and MS n ( n = 3) data, corroborated wherever possible by authentic standards. Notably, 10 of the CDPs are reported here for the first time from this fungal species.
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Shiyao Hua,Jiayue Liu,Sijia Pu,Liang Zou,Lei Zhang,Peng Li
Comprehensive elucidation of the chemical constituents of Astragali Radix is crucial for its quality control and edible product development. Herein, online comprehensive two-dimensional hydrophilic interaction liquid chromatography × reversed phase liquid chromatography tandem high-resolution mass spectrometry was elaborately designed to separate, identify, and qualitatively compare various chemical components of Astragali Radix from two species. After selection and optimization of stationary phase, mobile phase, elution program and interface, an optimum method suitable for chemical components in Astragali Radix was established successfully. Under the optimized separation conditions, the orthogonality reached 99 %. A total of 212 compounds were identified and tentatively identified (198 from A. membranaceus var. mongholicus and 177 from A. membranaceus ). Additionally, the fragmentation pattern of flavonoids and saponins mass data in Astragali Radix have also been systematically studied. These findings not only unveiled multi-component complexity and diversity in two Astragalus species, but also proposed an innovative strategy for the rapid separation and identification of other complex systems.
研究领域:
中药学
·
分析化学
·
植物化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
·
2012
·
IF 2.888
Mantong Song,Tiejie Wang,Qing Li,Longshan Zhao,Huijuan Fang,Dongxiang Li,Kaishun Bi
A liquid chromatography hybrid ion trap time-of-flight mass spectrometric (LC–IT-TOF-MS) method was developed and validated for identification and simultaneous determination of the potential bioactive components from green tea in rat plasma. The plasma samples were extracted by liquid–liquid extraction with ethyl acetate and separated on Shim-pack XR-ODS II column by a gradient elution within a runtime of 8.0 min. The mobile phase consisted of A (0.1% formic acid in acetonitrile) and B (0.1% formic acid in water) at a flow rate of 0.4 ml/min. Two prototype components and one metabolite were successfully identified as caffeine, theobromine and theophylline according to their retention times, accurate molecule weight, and major fragment ions. Then they were determined with the addition of two internal standards, hypoxanthine and paracetamol. The linear range was 10–10,000 ng/ml for caffeine, 2.0–2000 ng/ml for theobromine and 1.0–1000 ng/ml for theophylline, respectively. Intra-day and inter-day precision were within 6.0% and 10.9%, and accuracy was less than 4.8% and 6.5%, respectively. The validated method was successfully applied to investigate the dynamic change rules of caffeine, theobromine and theophylline in rat plasma after oral administration of caffeine, theobromine and green tea extract. The comparative analysis of the pharmacokinetic parameters indicated that there were obvious differences between green tea extract administration and single substances administration.
研究领域:
分析化学
·
药理学
✓ 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）