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High-performance photodetectors based on two-dimensional perovskite crystals with alternating interlayer cations

Journal of Materiomics 2023年第4期9卷 817-823页

作者： Yezhan li Zhengxun Lai You Meng Wei Wang Yuxuan Zhang xuwen Zhao Di Yin Weijun Wang Pengshan Xie Quan Quan SenPo Yip Johnny C.Ho Department of Materials Science and Engineering City University of Hong Kong999077Hong Kong SARChina Institute for Materials Chemistry and Engineering Kyushu UniversityFukuoka816-8580Japan State Key Laboratory of Terahertz and Millimeter Waves City University of Hong Kong999077Hong Kong SARChina

Organic-inorganic halide perovskite,as a low-cost,solution-processable material with remarkable optoelectronic properties,is ideal candidate to fabricate high-performance photodetectors and is expected to significantly reduce device *** to the common Dion-Jacobson and Ruddlesden-Popper two-dimensional(2D)layered hybrid perovskite compounds,the perovskites with alternating cations in the interlayer(ACI)phase show higher crystal symmetry and narrower optical bandgaps,which exhibit great potential for excellent photodetection ***,we report a high-performance photodetector based on the 2D bilayered hybrid lead halide perovskite single crystal with the ACI phase(GAMA_(2)Pb_(2)I_(7);GA=C(NH_(2))_(3)and MA=CH_(3)NH_(3)).The single-crystal photodetector exhibits high photoresponsivity of 1.56,2.54,and 2.60 A/W for incident light wavelengths of 405,532,and 635 nm under 9.82 nW,respectively,together with the correspondingly high detectivity values of 1.86×10^(12),3.04×10^(12),and 3.11×10^(12)Jones under the same operating ***,a high-resolution imaging sensor is built based on the GAMA_(2)Pb_(2)I_(7)single-crystal photodetector,confirming the high stability and photosensitivity of the imaging *** results show that the 2D hybrid lead halide perovskites with alternating interlayer cations are promising for high-performance visible light photodetectors and imaging systems.

关键词： Photodetector Two-dimensional Hybrid perovskite Alternating interlayer cation Imaging

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SEIARN Parameter Adaptive Model based on SSA

International Core Journal of Engineering

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International Core Journal of Engineering 2023年第4期9卷 378-383页

作者： Zhiwei Yang Yuqing Sun Hangyu He Xinru li xuwen Sun

The SEIARN model is often used to predict infectious diseases, but the parameter estimation of the SEIARN model has always been one of the difficulties in this research. Traditional statistical and empirical estimation methods have certain limitations. To this end, we designed an SSA‐based SEIARN parameter adaptive model, optimized parameters through SSA, and used historical epidemic data in Hebei, Tianjin, and Beijing for simulation. Experiments finally proved the feasibility of the algorithm.

关键词： SEIARN SSA Parameter Optimization Epidemic Prediction

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Latex microspheres lateral flow immunoassay with smartphone-based device for rapid detection of Cryptococcus

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TALANTA 2025年 284卷 127254页

作者： Zang, Xuelei Zhou, Yangyu li, Shuming Shi, Gang Deng, Hengyu Zang, Xuefeng Cao, Jingrong Yang, Ruonan lin, xuwen Deng, Hui Huang, Yemei Yang, Chen Wu, Ningxin Song, Chao Wu, lidong Xue, Xinying Capital Med Univ Beijing Shijitan Hosp Emergency & Crit Care Med Ctr Dept Resp & Crit Care Beijing 100038 Peoples R China Shandong Second Med Univ Weifang 261053 Peoples R China Datang Telecom Convergence Commun Technol Co Ltd Beijing 100094 Peoples R China Chinese Acad Fishery Sci Beijing 100141 Peoples R China Capital Med Univ Xuanwu Hosp Dept Clin Lab Beijing 100053 Peoples R China Nanjing Normal Univ Sch Food Sci & Pharmaceut Engn Nanjing 210023 Peoples R China Chinese Peoples Liberat Army Gen Hosp Med Lab Ctr Med Ctr 1 Beijing 1000853 Peoples R China 971 Hosp Chinese Peoples Liberat Army Navy Dept Cadres Qingdao 266000 Peoples R China Chinese Acad Fishery Sci Freshwater Fisheries Res Ctr Wuxi 214081 Peoples R China

Cryptococcus is a pathogenic fungus that poses a threat to human health. Conventional detection methods have limited the rapid and accurate qualitative and quantitative analysis of Cryptococcus, affecting early diagnosis and treatment. In this study, we developed a Point-of-Care Testing (POCT) platform that integrates lateral flow immunoassay (LFIA) with smartphones, enabling both rapid qualitative and quantitative detection of Cryptococcus. The LFIA strip utilizes latex microspheres (LMs) as labeling probes, achieving a detection limit of 3000 CFU/mL and presenting higher sensitivity than the Colloidal Gold Nanoparticles Lateral Flow Immunoassay (AuNPs-LFIA) strip, and approximately eight times that of the AuNPs-LFIA strip. Additionally, it exhibiting no cross-reactivity with over 24 common pathogens and validated in clinical samples. For quantitative analysis, artificial intelligence algorithms were employed to convert smartphone-captured images into grayscale values. Eleven feature values were utilized as a dataset for machine learning to construct a linear regression model, with Mean Squared Error (MSE) and R2 reaching 0.45 and 0.91, respectively. Moreover, the recovery rates in the serum samples ranged from 90.0 % to 108 %, indicating a good practicability. This research presents a rapid diagnostic technology for Cryptococcus and lays the theoretical and technical groundwork for detecting other pathogens.

关键词： Gold nanoparticles

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Charge Transfer Platform and Catalytic Amplification of Phenanthroimidazole Derivative: A New Strategy for DNA Bases Recognition

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ANALYTICAL CHEMISTRY 2019年第18期91卷 11938-11945页

作者： Lu, Nannan liu, He Huang, Rui Gu, Yue Yan, Xiaoyi Zhang, Tinging Xu, Zhiqian Xu, Haixin Xing, Yue Song, Yu li, xuwen Zhang, Zhiquan Jilin Univ Coll Chem Changchun 130012 Jilin Peoples R China

Research about DNA composition has been concentrated on DNA damage in the past few decades. However, it still remains a great challenge to construct a rapid, facile, and accurate approach for simultaneously monitoring four DNA bases, guanine (G), adenine (A), thymine (T), and cytosine (C). Herein, a novel electrochemical sensor based on phenanthroimidazole derivative, 2-(4-bromophenyl)-1-phenyl-1H-phenanthro[9,10-d]-imidazole (PPI), is successfully fabricated by a simple electrochemical method. The bromophenyl group in PI could expand their aromatic plane, induce the pi-conjugated extension, and enhance the charge transfer and pi-pi interaction. The phenyl group at N1 position could regulate the intermolecular interaction, which could promote the possibility of intermolecular connection. The PPI polymer (poly(PPI)) with pi-electron enriched conjugation architecture has been applied in simultaneous determination of G, A, T, and C in neutral solution by square wave voltammetry (SWV) method with well-separated peak potentials at 0.714, 1.004, 1.177, and 1.353 V, respectively. The sensor functionalized with poly(PPI) exhibits wide linear response for G, A, T, and C in the concentration ranges of 3-300, 1-300, 30-800, and 20-750 mu M, respectively. With favorable selectivity, stability, and reproducibility, the sensor is successfully utilized to monitor four DNA bases in real samples, displaying a promising prospect for electrochemical sensing devices.

关键词： Cytosine Genetics Electrodes Oxidation Acid and base chemistry

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The Supercritical N-Butanol Degradation Process for Recycling Photovoltaic Modules

SSRN

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SSRN 2024年

作者： Wang, xuwen liu, Zhifeng Ruan, Haoda li, Xinyu Zhang, Lei School of Mechanical Engineering Hefei University of Technology Hefei230009 China Anhui Province Key Laboratory of Low Carbon Recycling Technology and Equipment for Mechanical and Electrical Products Hefei230009 China State Key Laboratory of Environmental Adaptability for lndustrial Products Guangzhou510300 China

The rapid advancement of the photovoltaic (PV) industry has elevated the recycling and reuse of decommissioned PV modules to critical challenges, essential for tackling environmental concerns and achieving resource reutilization. To facilitate the efficient degradation of PV modules and recycling of silicon materials, this study proposes a PV module degradation and recycling process based on supercritical n-butanol. The effects of various factors on the degradation rate of PV modules were systematically evaluated using single-factor studies to select an appropriate range of process parameters for optimization. Employing the response surface methodology (RSM) for the meticulous optimization of process parameters, the optimized parameters were as follows: n-butanol solvent volume of 470 ml, temperature of 328 °C for 83 minutes, resulting in a module degradation rate of up to 99 %. A second-order regression model was established to predict degradation efficiency. The high applicability of the fitted model was verified by comparing the actual degradation rates with the model's predicted values. Finally, the superiority of this recycling method was validated by characterizing the solar cells obtained through the supercritical method and comparing these characteristics with those of cells disassembled mechanically. © 2024, The Authors. All rights reserved.

关键词： Recycling

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Growth of Robust Carbon Nitride Films by Double Crystallization with Exceptionally Boosted Electrochemiluminescence for Visual DNA Detection

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ADVANCED OPTICAL MATERIALS 2023年第6期11卷

作者： Hou, Yuhua Fang, Yanfeng Zhou, Zhixin Hong, Qing li, Wang Yang, Hong Wu, Kaiqing Xu, Yuan Cao, xuwen Han, Dan liu, Songqin Shen, Yanfei Zhang, Yuanjian Southeast Univ Sch Chem & Chem Engn Jiangsu Engn Lab Smart Carbon Rich Mat & Device Jiangsu Prov Hitech Key Lab Biomed ResState Key L Nanjing 211189 Peoples R China Southeast Univ Med Sch Nanjing 210009 Peoples R China

Electrochemically generated chemiluminescence (ECL) has attracted significant interest over the past decades, ranging from fundamental studies on highly efficient electron-to-photon interconversion to practical bioassays. Nonetheless, the ECL efficiency (phi(ECL)) of most emitters is low, which significantly hampers further development. Herein, this work reports a highly robust carbon nitride film with unusually enhanced ECL efficiency (2256 times higher than that of the reference Ru(bpy)(3)Cl-2/K2S2O8). Double crystallization, which provides the primary interaction of carbon nitride with the substrate and subsequent growth, plays a crucial role in the preparation. The improved ECL efficiency is ascribed to little pinholes suppressing futile co-reagent reduction, maintenance of more orbit-delocalized heptazine subunits improving ECL kinetics, and high transparency avoiding self-absorption. As a potential application, an ultrasensitive visual DNA biosensor by the naked eye is further successfully developed with a linear detection range of 100 pm to 1 mu m and limit of detection of 27 pm (S/N = 3).

关键词： biosensors carbon nitrides electrochemiluminescence energy conversion mechanical properties

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Prolonged QTc interval predicts long-term mortality in cirrhosis: a propensity score matching analysis

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SCANDINAVIAN JOURNAL OF GASTROENTEROLOGY 2021年第5期56卷 570-577页

作者： li, Shuhong Hao, xuwen liu, Simiao Gong, Yanxia Niu, Wei Tang, Yanping Tianjin Nankai Hosp Dept Gastroenterol Changjiang Rd 6 Tianjin 300100 Peoples R China

Background Prolonged corrected QT (QTc) interval is a hallmark of cirrhotic cardiomyopathy (CCM) and has been ascertained to predict mortality in cirrhosis. However, some critical issues remain to be addressed including unanimous cut-off, calculation approach and applicable population. Methods A total of 274 patients with cirrhosis were included. The prolonged QTc interval over 440 ms according to adjusted Fridericia's formula was used to stratify enrolled subjects. Independent predictors of 3-year mortality were identified with Cox regression model. The Kaplan-Meier method was implemented to obtain survival curves. To reduce impact of selection bias and possible confounders, a propensity score matching (PSM) analysis was used. Results QTc > 440 ms was an independent risk factor in the entire cohort and PSM subset (HR 2.532, 95% CI 1.431-4.480, p=.001;HR 2.802, 95% CI 1.171-6.701, p=.021, respectively). Subgroup analysis showed that QTc > 440 ms was an independent predictor in cirrhotics with age <= 60 years (HR = 1.02, p=.035) and in the presence of ascites (HR = 1.01, p=.008). Conclusions The prolonged QTc interval might help to identify patients with high-risk of all-cause mortality.

关键词： QTc cirrhosis cirrhotic cardiomyopathy propensity score matching

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Satellite microvibration measurement based on distributed compressed sensing

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MEASUREMENT 2022年 203卷

作者： li, li Zhou, Miaomiao Zhu, Ye Dai, Ya liang, xuwen Chinese Acad Sci Innovat Acad Microsatellites Shanghai 201204 Peoples R China Shanghai Engn Ctr Microsatellites Shanghai 201204 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China

To reduce the burden of multiple sensors on satellites with limited resources, distributed compressed sensing (DCS) is applied to microvibration measurement. An improved joint recovery algorithm using the recovered spectrum coefficients as the halting condition is proposed. This improvement can address the drawback that the previous algorithms need to anticipate signal sparsity or use residuals that do not reflect recovery accuracy in the frequency domain as the halting condition. In addition, acceleration is adopted in the improved algorithm. The DCS-based microvibration measurement was conducted on a satellite mechanical test model. The results reveal that the DCS measurement has a difference in the order of 1e-10 g2/Hz between the power spectrum density (PSD) of the raw data and the recovery data. With one-fifth sampling points of the raw signal, it can achieve a signal difference of less than 4% in PSD, which demonstrates the viability of satellite microvibration measure-ment based on DCS.

关键词： Microvibration measurement Distributed compressed sensing Joint recovery algorithm Power spectrum density

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煤矿矿井水资源化利用技术创新

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煤炭科学技术 2023年第1期51卷 523-530页

作者：何绪文王绍州张学伟李福勤中国矿业大学(北京)化学与环境工程学院北京100083 河北工程大学能源与环境工程学院河北邯郸056038

国家对煤矿矿井水资源化利用高度重视,排放标准的不断提高和智慧矿山概念的不断深化,给矿井水处理技术提出了新的挑战。通过对矿井水地面处理技术与井下多级过滤处理技术的分析和比较,在总结了现有技术存在问题的基础上,提出了聚瓷膜超... 详细信息

国家对煤矿矿井水资源化利用高度重视,排放标准的不断提高和智慧矿山概念的不断深化,给矿井水处理技术提出了新的挑战。通过对矿井水地面处理技术与井下多级过滤处理技术的分析和比较,在总结了现有技术存在问题的基础上,提出了聚瓷膜超滤高效处理矿井水新技术。新技术相比于传统处理技术的多流程而言,因处理过程无需加药,可省去整个加药系统,故处理过程仅包括高压预处理与常压过滤处理2个主要单元,解决了矿井水传统处理方法必须加混凝剂的难题,可真正做到矿井水处理全过程无人值守,符合智慧矿山的要求。新技术具有流程短、占地小、无需加药、出水水质稳定、可自动运行等特点,同时还可实现模块化、智能化,可适用于不同场景下含高悬浮物矿井水的直接过滤,或作为矿井水苦咸水的预处理单元,其中特别适合用于矿井水的井下处理就地复用。其核心组件聚瓷膜更是具有强度高、通量大、超亲水疏油、耐受悬浮物(SS)质量浓度可达10 000 mg/L等优势。通过实验室试验和矿井水地面处理改造工程案例可知,在进水SS质量浓度为0~10 000 mg/L,聚瓷膜直滤后出水SS均能稳定达到1 mg/L以下,浊度稳定达到1 NTU以下,该技术在煤矿矿井水资源化利用方面有明显优势,可为将来的大规模工程化推广应用提供技术参考。

关键词：矿井水悬浮物聚瓷膜资源化利用煤矿

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实质型肝结核的CT表现

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中国中西医结合影像学杂志 2019年第3期17卷 292-294页

作者：陆良其李旭文上海市松江区泗泾医院放射科

目的:总结实质型肝结核的CT征象,提高该病的CT诊断水平。方法:回顾性分析5例经病理证实的实质型肝结核的CT表现并复习相关文献。结果:粟粒型肝结核2例,CT示肝脏增大,肝内可见多发小囊样低密度灶及小钙化灶,增强扫描无强化;结节型肝结核3... 详细信息

目的:总结实质型肝结核的CT征象,提高该病的CT诊断水平。方法:回顾性分析5例经病理证实的实质型肝结核的CT表现并复习相关文献。结果:粟粒型肝结核2例,CT示肝脏增大,肝内可见多发小囊样低密度灶及小钙化灶,增强扫描无强化;结节型肝结核3例,病灶最大直径均>2.0cm,表现为肝内单发或多发略低密度灶,占位效应不明显,CT值41~50HU,增强扫描轻度强化。结论:CT检查是肝结核的重要影像学检查方法,当肝内病变缺乏典型CT征象时应考虑肝结核的可能(特别是在结核病流行地区)。CT筛查结合临床表现及实验室检查可提高肝结核诊断的准确率。

关键词：结核,肝体层摄影术,X线计算机

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