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Ultrahigh triethylamine sensitivity of WO3-MoO3 n-n heterojunction sensor operating at low-temperature

CHEMICAL ENGINEERING JOURNAL 2025年 507卷

作者： zhu, shuwen Fan, Huiqing Su, Yao Fan, Yongbo Wang, Weijia Northwestern Polytech Univ Sch Mat Sci & Engn State Key Lab Solidificat Proc Xian 710072 Peoples R China Hong Kong Polytech Univ Dept Appl Phys Hung Hom Hong Kong 100872 Peoples R China

Real-time monitoring of triethylamine (TEA) is essential for environmental safety and various applications in daily life. However, TEA gas sensors still encounter specific technical challenges, such as high operating temperatures and insufficient sensitivity. In this study, in order to reduce the operating temperature and improve sensitivity, WO3-MoO3 (WMo) n-n heterojunctions were synthesized via calcination and subsequent solvothermal method, in which WO3 tightly bound to the MoO3 nanobelt surface. The resulting heterojunction demonstrated excellent TEA sensing performance. The optimized gas sensor achieved a high response of 627.28 to 20 ppm TEA at a low operating temperature (100 degrees C). In addition, the device exhibited strong selectivity and stability. These improvements in gas sensing performance were attributed to the formation of n-n heterojunction between MoO3 and WO3, as well as the surface gas sensing reaction of oxygen species facilitated by oxygen vacancies at the heterojunction interface. This study can be applied to the design of novel n-n type metal oxide heterojunction materials for the application of low-temperature high-sensitivity TEA sensors.

关键词： Semiconducting metal oxide Triethylamine sensor Heterojunctions WO3-MoO3

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Pest Control in Agriculture Using LED Light Technology Based on High Spectral Imaging 24

Pest Control in Agriculture Using LED Light Technology Based...

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2nd International Conference on Artificial Intelligence, Systems and Network Security, AISNS 2024

作者： Xu, Weiwei Yu, Shiwen Wang, Yufei Qin, Tingting Yin, Ziqiang zhu, Minghui zhu, shuwen School of Electrical and Information Engineering Jilin Engineering Normal University Jilin Changchun China

ISBN: (纸本)9798400711237

Hyperspectral imaging technology is a comprehensive technology that combines optical spectroscopy and imaging technology. Its application in agriculture is increasingly extensive, and its unique advantages make it play an important role in crop monitoring, pest diagnosis and so on. This time, by using hyperspectral imaging technology and the principle that the LED visible light source does not contain ultraviolet light, is not attractive to insects and can emit specific wavelengths of light, STM32 microcontroller and software circuit are used to design and develop an environment for agricultural pests that can detect the surrounding light intensity, temperature, humidity and so on. And it can automatically control the adjustment of LED light source through digital image processing technology, carry out light control technology of precise insect repellent, and successfully apply it in actual production. © 2024 Copyright held by the owner/author(s).

关键词： Hyperspectral imaging

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Electronic structure engineering of single atomic sites by plasmoninduced hot electrons for highly efficient and selective photocatalysis

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Nano Research 2024年第8期17卷 6960-6967页

作者： Xiaoya Huang Xinyuan Li Akang Chen Hongfei Gu Shouyuan Li Tailei Hou shuwen zhu Shuang Yu Yin Song Jiatao Zhang Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications MIIT Key Laboratory of Medical Molecule Science and Pharmaceutical EngineeringMOE Key Laboratory of Cluster ScienceSchool of Chemistry and Chemical EngineeringSchool of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China MIIT Key Laboratory of Complex-field Intelligent Exploration School of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China

Single atom(SA)catalysts have achieved great success on highly selective heterogeneous catalysis due to their abundant and homogeneous active *** electronic structures of these active sites,restrained by their localized coordination environments,significantly determine their catalytic performances,which are difficult to ***,we investigated the effect of localized surface plasmon resonance(LSPR)on engineering the electronic structures of single atomic ***,core–shell structures consisted of Au core and transition metal SAs loaded N-doped carbon(CN)shell were constructed,namely Au@M-SA/CN(M=Ni,Fe,and Co).It was demonstrated that plasmon-induced hot electrons originated from Au were directionally injected to the M-SAs under visible light irradiation,which significantly changed their electronic structures and meanwhile facilitated improved overall charge separation *** as-prepared Au@Ni-SA/CN exhibited highly efficient and selective photocatalytic CO_(2) reduction to CO performance,which is 20.8,17.5,and 6.9 times those of Au nanoparticles,Au@CN,and Ni-SA/CN,*** spectroscopy analysis and theoretical calculations confirmed that the plasmon enhanced Ni-SA/CN sites featured increased charge density for efficient intermediate activation,contributing to the superb photocatalytic *** work provides a new insight on plasmon and atomic site engineering for efficient and selective catalysis.

关键词： single atom catalysts plasmon enhancement coupling effect photocatalysis CO_(2) reduction

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A novel color-aided system for diagnosis of early gastric cancer using magnifying endoscopy with narrow-band imaging

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SURGICAL ENDOSCOPY AND OTHER INTERVENTIONAL TECHNIQUES 2024年第11期38卷 6541-6550页

作者： Zhang, Hui Ruan, Rongwei Fang, Jin Yu, Jiangping Chen, Shengsen Tao, Yali zhu, shuwen Wang, Shi Chinese Acad Sci Zhejiang Canc Hosp Hangzhou Inst Med HIM Dept Endoscopy Banshan Rd 1 Hangzhou 310022 Zhejiang Peoples R China Wenzhou Med Univ Zhejiang Canc Hosp Postgrad Training Base Alliance Hangzhou 310022 Zhejiang Peoples R China

BackgroundThe Pink Zone Pattern (PP) sign is a typical color alteration of early gastric cancer (EGC) under magnifying endoscopic narrow-band imaging (ME-NBI). By integrating the color changes (PP sign) with the "vessel plus surface (VS)" classification system, we developed an innovative diagnostic system for EGC and named it "Pink Microsurface Microvascular (PSV)" system. Here, we aimed to elucidate the diagnostic performance of the PSV system for *** conducted a single-center prospective clinical study (before-after design) consisting of 2 cross-sectional studies at 2 separate periods. In the before phase, 184 suspected lesions were evaluated using the VS system under ME-NBI;in the after phase, 183 suspected lesions were evaluated using the PSV system. We compared the diagnostic accuracy, sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) between the VS group and the PSV *** accuracy, sensitivity, specificity, PPV, and NPV of the VS system for EGC were 84.6%, 87.0%, 83.6%, 67.8%, and 94.2%, respectively, and those for the PSV system were 93.0%, 92.0%, 93.4%, 85.2%, and 96.6%, respectively. The accuracy, specificity, and PPV of the PSV system were superior to those of the VS system. However, the sensitivity and NPV did not significantly differ between the VS system and the PSV system. The VS system was inconclusive for 22 lesions (12.0%) and the PSV system was inconclusive for 11 lesions (6.0%). The PSV system could identify more suspicious lesions than the VS *** propose a new PSV diagnostic system by combining the VS system and the PP sign. Compared with the VS system, the PSV system could identify more suspected lesions and improve the diagnostic performance of EGC.

关键词： Gastric cancer Pink Zone Pattern PSV system Narrow-band imaging Magnifying endoscopy

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Oxygen vacancies rich in indium oxide hollow prism-like nanoflowers derived from NH2-MIL-68 (In) for promoted triethylamine sensing

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SENSORS AND ACTUATORS B-CHEMICAL 2024年 402卷

作者： Miao, Jinwei Fan, Yongbo zhu, shuwen Li, Xiaomin Lei, Lin Yan, Kang Zheng, Shiqi Wang, Weijia Fan, Huiqing Northwestern Polytech Univ Sch Mat Sci & Engn State Key Lab Solidificat Proc Xian 710072 Peoples R China Northwestern Polytech Univ Inst Flexible Elect Frontiers Sci Ctr Flexible Elect Xian 710072 Peoples R China Univ Sheffield Dept Mat Sci & Engn Sheffield S1 3JD England

Triethylamine (TEA) is widely viewed as the toxic volatile organic compounds and causes a severe risk to environmental protection and human health. However, the current sensors are still unable to meet the growing demand for effective and reliable detection of TEA gas. Herein, a newly designed TEA sensor based on In2O3 prism-like nanoflowers with hollow mesoporous structure is designed by directly calcining NH2-MIL-68 (In) in air atmosphere. A series of analytical techniques are performed such as BET, XPS, UV-vis, PL, EPR and Hall effect measurements. All the characterization results prove that the In2O3-400 prepared by annealing NH2-MIL-68 at 400 degrees C exhibits the maximum concentration of oxygen vacancies, the highest specific surface area, and excellent electron mobility, resulting in the best performance toward TEA. The prepared In2O3-400-based sensors possess ultrahigh response of 684.32 when exposed to 7 ppm TEA at 100 degrees C and exhibit a minimum detection limit of 0.046 ppb. The remarkable performance makes the sensors based on In2O3-400 prism-like nanoflowers become a very competitive sensing material for the detection of trace TEA vapor. The excellent selectivity, repeatability and long-term stability ensure the actual application of the prepared sensors.

关键词： Gas sensor Triethylamine Mental organic framework Oxygen vacancies

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Engineering doping and defect in graphitic carbon nitride by one-pot method for enhanced photocatalytic hydrogen evolution

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CERAMICS INTERNATIONAL 2023年第4期49卷 6729-6738页

作者： Chang, Xinye Fan, Huiqing zhu, shuwen Lei, Lin Wu, Xiaobo Feng, Cheng Wang, Weijia Ma, Longtao Northwestern Polytech Univ Sch Mat Sci & Engn State Key Lab Solidificat Proc Xian 710072 Peoples R China Northwestern Polytech Univ Inst Flexible Elect Xian 710072 Peoples R China

Hydrogen energy, as one clean energy, is one of the important ways to decarbonize in the future. The advancement of doping and constructing defect engineering in graphitic carbon nitride (g-C3N4) show promise for artificial photosynthesis for H2 evolution using solar energy. Unfortunately, it is still difficult to generate g-C3N4 that has been co-modified by doping and defect and investigate their synergistic effects. In this study, potassium thioacetate was used first-time as a potassium source and dehydrogenation agent to prepare g-C3N4 decorated by K+ ions and cyano groups with enhanced H2 evolution by a one-step method in an air atmosphere. The presence of K+ ions can increase the density of electron clouds in the delocalized pi bond of the heptazine ring. The cyano group may successfully delocalize the solitary valence electrons in conjugated heterocycles since it is a potent electron-withdrawing group. These outcomes allow the modified catalysts to achieve improved H2 evolution activity, reduced interfacial transfer resistance, and increased light absorption and photocurrent. Finally, K(0.05)-CN's photocatalytic hydrogen evolution rate (HER) rose to 1319 mu mol h-1 g-1, which is five-fold better than that of CN, and the normalized HER reached 118 mu mol h-1 m- 2, which was much higher than other reports. This research not only offers a fresh approach to creating photocatalysts with good H2 evolution effi-ciency but also advances a deep understanding of how structural defects and alkali metal doping affect photo -catalytic activity.

关键词： Photocatalysis H2 evolution Potassium thioacetate Defect engineering Doping

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PK-PD relationship of poorly absorbable active ingredients from traditional Chinese medicines explaining by metabolic enzyme of gut microbiota: A case study of Dehydrocorydaline

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JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS 2025年 252卷 116478页

作者： Gu, Xiaoting Cai, Yutian Zheng, Chaoyue Xie, Liuyao Zhang, Linyi Lu, Bingjie zhu, shuwen Cui, Yue Ai, Xiaoyu Yang, Cheng Nankai Univ Coll Pharm State Key Lab Med Chem Biol 38 Tongyan Rd Tianjin 300350 Peoples R China Nankai Univ Tianjin Key Lab Mol Drug Res 38 Tongyan Rd Tianjin 300350 Peoples R China Jilin Med Univ Sch Pharm Jilin 132013 Peoples R China

Many active ingredients in traditional Chinese medicines generally have the characteristic of poor oral absorption but definite efficacy. It is necessary to establish a comprehensive technical system to explain the "PK-PD relationship" of them. Dehydrocorydaline (DHC), the quality control component in the Chinese patent drug "Kedaling Tablets", has poor oral absorption but clear efficacy for coronary heart disease. Using DHC as a model drug, the changes in absorption and pharmacological effects of DHC in rats before and after inhibiting nitroreductase (NR) from gut microbiota were studied. The results showed that after inhibiting of NR activity, the plasma concentration of DHC in rats was decreased, the serum level of total cholesterol, triglyceride and low- density lipoprotein cholesterol were significantly increased. The levels of tumor necrosis factor-alpha, interleukin1 beta, hypersensitive C-reactive protein, intercellular cell adhesion molecule-1 and Monocyte chemoattractant protein-1 were significantly increased, and pathological sections also showed that the efficacy of DHC decreased after inhibiting the activity of NR. We further investigated the drug metabolism of DHC under NR and found that DHC was metabolized into a hydrogenated metabolite, which may have stronger membrane permeability. In summary, NR may mediate the absorption degree and efficacy of DHC in vivo by metabolizing DHC into absorbable metabolite.

关键词： PK-PD relationship Traditional Chinese medicines Dehydrocorydaline Nitroreductase Coronary heart disease

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The Pink Zone Pattern (PP) sign: A novel simple marker for early gastric cancer

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DIGESTIVE AND LIVER DISEASE 2023年第8期55卷 1100-1104页

作者： Ruan, Rongwei Zhang, Hui Yu, Jiangping Chen, Shengsen Tao, Yali zhu, shuwen Li, Yandong Wang, Shi Chinese Acad Sci Univ Chinese Acad Sci Canc Hosp Inst Canc & Basic Med IBMCDept EndoscopyZhejian Hangzhou Peoples R China Banshan Rd 1 Hangzhou 310022 Peoples R China

Background: We previously found a pink-colored change in early gastric cancer (EGC) lesions under magnifying endoscopy with narrow-band imaging (ME-NBI) and named it the "Pink Zoon Pattern" (PP) sign, which appeared independent of microvascular and microstructural changes. The aim of this study was to further investigate the characteristics of the PP sign in ***: The consecutive patients with suspicious gastric lesions detected by ME-NBI and confirmed by pathology at Zhejiang Cancer Hospital between November 2020 and December 2021 were enrolled in the study. The suspicious lesions were observed and assessed by the "VS" system and the PP sign ***: We found that in the PP-positive group, 238 lesions (96.0%) were diagnosed as malignant. The overall accuracy, sensitivity, and specificity were 84.7%, 85.3%, and 81.8%. Among 164 EGC lesions diagnosed with low confidence (Grades 2, 3, and 4) using the VS system, the overall accuracy of PP to discriminate tumor from normal was 82.3%. The sensitivity and specificity were 82.7% and 81.5% ***: The PP sign could be a new simple sign for the diagnosis of EGC and as an effective supplement to VS system when using ME-NBI.& COPY;2023 Editrice Gastroenterologica Italiana S.r.l. Published by Elsevier Ltd. All rights reserved.

关键词： Pink zoon pattern sign Early gastric cancer Magnifying endoscopy Diagnosis

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SnO2 NSs synthesized by hydrothermal method for Cl2 sensing

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CERAMICS INTERNATIONAL 2022年第19期48卷 28221-28230页

作者： Zheng, Shiqi Li, Qiang zhu, shuwen Yadav, Arun Kumar Miao, Jinwei Wang, Weijia Fan, Huiqing Northwestern Polytech Univ Sch Mat Sci & Engn State Key Lab Solidificat Proc Xian 710072 Peoples R China

Three-dimensional flower-shaped tin dioxide nanosheets (SnO2 NSs) are prepared by magnetic stirring, hydrothermal reaction and ice bath rapid cooling using tin dichloride dihydrate as raw material. The same raw materials and preparation process are used to prepare the tin oxide nanoparticles (SnO2 NPs) by natural cooling. The SEM characterization results show that SnO2 NPs is about 50 nm, and it is composed of the irregular aggregation of nanoparticles. The SnO2 NSs formed by rapid cooling show a three-dimensional flower-like morphology with well dispersion and interconnection. The reliable analysis of the growth mechanism of SnO2 NSs is supplied through the literature investigation and material characterization results. Compared with SnO2 NPs, the higher specific surface area of SnO2 NSs makes it have stronger gas sensitive response value and selectivity to chlorine gas (Cl-2). The gas response of the SnO2 NSs sensor is 223 to 5 ppm Cl-2 at 160 degrees C, and the detection limit is 0.0981 ppb by linear fitting of detection results at different concentrations. The SnO2 NSs sensor maintains good stability with a fluctuation range of 11% in the relative humidity lower than 60% and exhibits excellent selectivity to Cl-2. A series of results demonstrate that SnO2 NSs has large latent capacity as a gas sensor material for monitoring Cl-2. The possible mechanism of the preeminent performance of the SnO2 NSs for Cl-2 detection is also deduced in detail.

关键词： SnO2 NSs Gas sensor Cl-2 Rapid cooling

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In situ synchrotron X-ray diffraction for actuation in sodium bismuth titanate relaxor ferroelectrics

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MATERIALS HORIZONS 2025年 2025 Apr 30页

作者： Jia, Yuxin Fan, Yongbo Lei, Lin Su, Yao zhu, shuwen Dong, Guangzhi Hinterstein, Manuel Li, Qiang Wang, Weijia Fan, Huiqing Northwestern Polytech Univ Sch Elect & Informat Xian 710072 Peoples R China Hong Kong Polytech Univ Dept Appl Phys Kowloon 11 Yucai Rd Hong Kong Peoples R China Northwestern Polytech Univ Sch Mat Sci & Engn State Key Lab Solidificat Proc Xian 710072 Peoples R China Xidian Univ Sch Adv Mat & Nanotechnol Xian 710071 Peoples R China Fraunhofer Inst Mat Mech Freiburg Germany

Sodium bismuth titanate-based (NBT-based) ergodic relaxor ferroelectrics have garnered significant attention for actuator applications due to their fully reversible electrostrain behavior. In general, it is believed that the electrostain originates from three main aspects: electric field-induced phase transitions with volume changes, non-180 degrees domain switching, and lattice stretching without volume changes. However, the individual contribution remains to be quantitatively understood. In this work, in situ synchrotron X-ray diffraction in different integration directions is performed to quantify the contributions of electric field-induced phase transition and non-180 degrees domain switching to electrostrain for NBT-based ergodic relaxor ferroelectrics under external electric field. The calculated total strain is 0.41%, in which 0.038% results from volume strain related to the electric field-induced phase transition, while 0.127% is due to induced ferroelastic domain structures. The rest 0.245% is attributed to lattice stretching. The volume change caused directly by phase transition has a very limited effect on electrostrain, while the indirect effect of phase transition on strain (the domain switching of the ferroelectric phase) has a relatively large effect on electrostrain. This innovative work offers theoretical insights for optimizing NBT-based relaxor ferroelectric materials for actuator applications, contributing to better control of electrostrain.

关键词： Ferroelectric materials

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