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Guo L, Song Y, Wang B, Cong R, Zhao L, Zhang S, Li L, Wu W, Wang S, San X, Pan C, Yang Z. Surface Passivation to Enhance the Interfacial Pyro-Phototronic Effect for Self-Powered Photodetection Based on Perovskite Single Crystals. ACS Appl Mater Interfaces 2024; 16:16482-16493. [PMID: 38506366 DOI: 10.1021/acsami.4c00302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/21/2024]
Abstract
The interfacial pyro-phototronic effect (IPPE) presents a novel approach for improving the performance of self-powered photodetectors (PDs) based on metal halide perovskites (MHPs). The interfacial contact conditions within the Schottky junctions are crucial in facilitating the IPPE phenomenon. However, the fabrication of an ideal Schottky junction utilizing MHPs is a challenging endeavor. In this study, we present a surface passivation method aimed at enhancing the performance of self-powered photodetectors based on inverted planar perovskite structures in micro- and nanoscale metal-halide perovskite SCs. Our findings demonstrate that the incorporation of a lead halide salt with a benzene ring moiety for surface passivation leads to a substantial improvement in photoresponses by means of the IPPE. Conversely, the inclusion of an alkane chain in the salt impedes the IPPE. The underlying mechanism can be elucidated through an examination of the band structure, particularly the work function (WF) modulated by surface passivation. Consequently, this alteration affects the band bending and the built-in field (VBi) at the interface. This strategy presents a feasible and effective method for producing interfacial pyroelectricity in MHPs, thus facilitating its potential application in practical contexts such as energy conversion and infrared sensors.
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Affiliation(s)
- Linjuan Guo
- Hebei Key Laboratory of Photo-Electricity Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding 071002, P. R. China
| | - Yi Song
- Hebei Key Laboratory of Photo-Electricity Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding 071002, P. R. China
| | - Baorong Wang
- Hebei Key Laboratory of Photo-Electricity Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding 071002, P. R. China
| | - Ridong Cong
- Hebei Key Laboratory of Photo-Electricity Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding 071002, P. R. China
| | - Lei Zhao
- Hebei Key Laboratory of Photo-Electricity Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding 071002, P. R. China
| | - Suheng Zhang
- Hebei Key Laboratory of Photo-Electricity Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding 071002, P. R. China
| | - Leipeng Li
- Hebei Key Laboratory of Photo-Electricity Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding 071002, P. R. China
- Institute of Life Science and Green Development, Hebei University, Baoding 071002, P. R. China
| | - Wenqiang Wu
- Institute of Atomic Manufacturing, Beihang University, Beijing 100191, P. R. China
| | - Shufang Wang
- Hebei Key Laboratory of Photo-Electricity Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding 071002, P. R. China
| | - Xingyuan San
- Hebei Key Laboratory of Photo-Electricity Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding 071002, P. R. China
| | - Caofeng Pan
- Institute of Atomic Manufacturing, Beihang University, Beijing 100191, P. R. China
| | - Zheng Yang
- Hebei Key Laboratory of Photo-Electricity Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding 071002, P. R. China
- Institute of Life Science and Green Development, Hebei University, Baoding 071002, P. R. China
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Guo L, Qi Y, Wu Z, Yang X, Yan G, Cong R, Zhao L, Zhang W, Wang S, Pan C, Yang Z. A Self-Powered UV Photodetector With Ultrahigh Responsivity Based on 2D Perovskite Ferroelectric Films With Mixed Spacer Cations. Adv Mater 2023; 35:e2301705. [PMID: 37683840 DOI: 10.1002/adma.202301705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Revised: 07/30/2023] [Indexed: 09/10/2023]
Abstract
Self-powered photodetectors (PDs) have the advantages of no external power requirement, wireless operation, and long life. Spontaneous ferroelectric polarizations can significantly increase built-in electric field intensity, showing great potential in self-powered photodetection. Moreover, ferroelectrics possess pyroelectric and piezoelectric properties, beneficial for enhancing self-powered PDs. 2D metal halide perovskites (MHPs), which have ferroelectric properties, are suitable for fabricating high-performance self-powered PDs. However, the research on 2D metal halide perovskites ferroelectrics focuses on growing bulk crystals. Herein, 2D ferroelectric perovskite films with mixed spacer cations for self-powered PDs are demonstrated by mixing Ruddlesden-Popper (RP)-type and Dion-Jacobson (DJ)-type perovskite. The (BDA0.7 (BA2 )0.3 )(EA)2 Pb3 Br10 film possesses, overall, the best film qualities with the best crystalline quality, lowest trap density, good phase purity, and obvious ferroelectricity. Based on the ferro-pyro-phototronic effect, the PD at 360 nm exhibits excellent photoelectric properties, with an ultrahigh peak responsivity greater than 93 A W-1 and a detectivity of 2.5 × 1015 Jones, together with excellent reproducibility and stability. The maximum responsivities can be modulated by piezo-phototronic effect with an effective enhancement ratio of 480%. This work will open up a new route of designing MHP ferroelectric films for high-performance PDs and offers the opportunity to utilize it for various optoelectronics applications.
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Affiliation(s)
- Linjuan Guo
- Hebei Key Laboratory of Optic-Electronic Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding, 071002, P. R. China
- CAS Center for Excellence in Nanoscience, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 100140, P. R. China
| | - Yaqian Qi
- Hebei Key Laboratory of Optic-Electronic Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding, 071002, P. R. China
| | - Zihao Wu
- Hebei Key Laboratory of Optic-Electronic Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding, 071002, P. R. China
| | - Xiaoran Yang
- Hebei Key Laboratory of Optic-Electronic Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding, 071002, P. R. China
| | - Guoying Yan
- Hebei Key Laboratory of Optic-Electronic Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding, 071002, P. R. China
| | - Ridong Cong
- Hebei Key Laboratory of Optic-Electronic Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding, 071002, P. R. China
| | - Lei Zhao
- Hebei Key Laboratory of Optic-Electronic Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding, 071002, P. R. China
| | - Wei Zhang
- Hebei Key Laboratory of Optic-Electronic Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding, 071002, P. R. China
| | - Shufang Wang
- Hebei Key Laboratory of Optic-Electronic Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding, 071002, P. R. China
| | - Caofeng Pan
- CAS Center for Excellence in Nanoscience, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 100140, P. R. China
| | - Zheng Yang
- Hebei Key Laboratory of Optic-Electronic Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding, 071002, P. R. China
- CAS Center for Excellence in Nanoscience, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 100140, P. R. China
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Guo L, Liu X, Cong R, Gao L, Zhang K, Zhao L, Wang X, Wang RN, Pan C, Yang Z. Patterned 2D Ferroelectric Perovskite Single-Crystal Arrays for Self-Powered UV Photodetector Boosted by Combining Ferro-Pyro-Phototronic and Piezo-Phototronic Effects. Nano Lett 2022; 22:8241-8249. [PMID: 36215318 DOI: 10.1021/acs.nanolett.2c02978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Metal halide perovskite ferroelectrics possess various physical characteristics such as piezoelectric and pyroelectric effects, which could broaden the application of perovskite ferroelectrics and enhance the optoelectronic performance. Therefore, it is promising to combine multiple effects to optimize the performance of the self-powered PDs. Herein, patterned 2D ferroelectric perovskite (PMA)2PbCl4 microbelt arrays were demonstrated through a PDMS template-assisted antisolvent crystallization method. The perovskite arrays based flexible photodetectors exhibited fine self-powered photodetection performance under 320 nm illumination and much enhanced reproducibility compared with the randomly distributed single-crystal microbelts-based PDs. Furthermore, by introducing the piezo-phototronic effect, the performance of the flexible PD was greatly enhanced. Under an external tensile strain of 0.71%, the responsivity was enhanced by 185% from 84 to 155.5 mA/W. Our findings offer the advancement of comprehensively utilizing various physical characteristics of the ferroelectrics for novel ferroelectric optoelectronics.
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Affiliation(s)
- Linjuan Guo
- Hebei Key Laboratory of Optic-Electronic Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding 071002, PR China
| | - Xiu Liu
- Hebei Key Laboratory of Optic-Electronic Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding 071002, PR China
| | - Ridong Cong
- Hebei Key Laboratory of Optic-Electronic Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding 071002, PR China
| | - Linjie Gao
- Hebei Key Laboratory of Optic-Electronic Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding 071002, PR China
| | - Kai Zhang
- Hebei Key Laboratory of Optic-Electronic Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding 071002, PR China
| | - Lei Zhao
- Hebei Key Laboratory of Optic-Electronic Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding 071002, PR China
| | - Xinzhan Wang
- Hebei Key Laboratory of Optic-Electronic Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding 071002, PR China
| | - Rui-Ning Wang
- Hebei Key Laboratory of Optic-Electronic Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding 071002, PR China
| | - Caofeng Pan
- CAS Center for Excellence in Nanoscience, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing 100083, PR China
| | - Zheng Yang
- Hebei Key Laboratory of Optic-Electronic Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University, Baoding 071002, PR China
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Huang Y, Jia L, Shi X, Liu X, Lu W, Cong R, Gao C, Yu W. Improved interface passivation by optimizing a polysilicon film under different hydrogen dilution in N-type TOPCon silicon solar cells. RSC Adv 2022; 12:12753-12759. [PMID: 35480349 PMCID: PMC9041107 DOI: 10.1039/d2ra01286c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Accepted: 04/19/2022] [Indexed: 12/05/2022] Open
Abstract
The passivation properties of a polysilicon (poly-Si) thin film are the key for improving the photovoltaic performance of TOPCon silicon solar cells. In this work, we investigate the influence of the poly-Si microstructure on the interface passivation and photovoltaic performance in TOPCon solar cells. The poly-Si thin films are prepared from phosphorus-doped hydrogenated microcrystalline silicon (μc-Si:H) layers deposited via plasma enhanced chemical vapor deposition (PECVD) under different hydrogen dilutions and recrystallized by high temperature post-deposition annealing. The results revealed that, as the hydrogen dilution ratio increases, the microstructure of the pre-deposited films transforms from an amorphous phase to a microcrystalline phase. Meanwhile, the effective minority carrier lifetime of the symmetrically passivated contact structure shows a maximum value of 1.75 ms, implying that the efficient passivation at the c-Si interface is obtained which is mainly attributed to the joint enhancement of the improved field effect passivation from poly-Si films and the reduced defects density on the silicon surface. Consequently, the devices displayed excellent rectification behavior with a rectifying ratio of 3 × 105, ascribed to the enhanced carrier transport with the high quality poly-Si film pre-deposited in the initial region of structural transition. Correspondingly, the obvious improvement of TOPCon solar cell performance was achieved, exhibiting an optimized conversion efficiency of 17.91%. The results provide an optimal design scheme for enhancing the photovoltaic properties of the TOPCon silicon solar cells. The efficient passivation at the c-Si interface, and thus the enhanced photovoltaic performance in TOPCon silicon solar cells are obtained by appropriate hydrogen dilution of poly-Si film.![]()
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Affiliation(s)
- Yanhong Huang
- Hebei Key Laboratory of Optic-Electronic Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University Baoding 071002 China
| | - Lizhe Jia
- Hebei Key Laboratory of Optic-Electronic Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University Baoding 071002 China
| | - Xiaomeng Shi
- Hebei Key Laboratory of Optic-Electronic Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University Baoding 071002 China
| | - Xiaoyu Liu
- Hebei Key Laboratory of Optic-Electronic Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University Baoding 071002 China
| | - Wanbing Lu
- Hebei Key Laboratory of Optic-Electronic Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University Baoding 071002 China
| | - Ridong Cong
- Hebei Key Laboratory of Optic-Electronic Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University Baoding 071002 China
| | - Chao Gao
- Hebei Key Laboratory of Optic-Electronic Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University Baoding 071002 China
| | - Wei Yu
- Hebei Key Laboratory of Optic-Electronic Information and Materials, National & Local Joint Engineering Laboratory of New Energy Photoelectric Devices, College of Physics Science and Technology, Hebei University Baoding 071002 China
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5
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Cong R, Qiao S, Liu J, Mi J, Yu W, Liang B, Fu G, Pan C, Wang S. Ultrahigh, Ultrafast, and Self-Powered Visible-Near-Infrared Optical Position-Sensitive Detector Based on a CVD-Prepared Vertically Standing Few-Layer MoS 2/Si Heterojunction. Adv Sci (Weinh) 2018; 5:1700502. [PMID: 29619301 PMCID: PMC5827457 DOI: 10.1002/advs.201700502] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2017] [Revised: 09/28/2017] [Indexed: 05/08/2023]
Abstract
MoS2, as a typical transition metal dichalcogenide, has attracted great interest because of its distinctive electronic, optical, and catalytic properties. However, its advantages of strong light absorption and fast intralayer mobility cannot be well developed in the usual reported monolayer/few-layer structures, which make the performances of MoS2-based devices undesirable. Here, large-area, high-quality, and vertically oriented few-layer MoS2 (V-MoS2) nanosheets are prepared by chemical vapor deposition and successfully transferred onto an Si substrate to form the V-MoS2/Si heterojunction. Because of the strong light absorption and the fast carrier transport speed of the V-MoS2 nanosheets, as well as the strong built-in electric field at the interface of V-MoS2 and Si, lateral photovoltaic effect (LPE) measurements suggest that the V-MoS2/Si heterojunction is a self-powered, high-performance position sensitive detector (PSD). The PSD demonstrates ultrahigh position sensitivity over a wide spectrum, ranging from 350 to 1100 nm, with position sensitivity up to 401.1 mV mm-1, and shows an ultrafast response speed of 16 ns with excellent stability and reproducibility. Moreover, considering the special carrier transport process in LPE, for the first time, the intralayer and the interlayer transport times in V-MoS2 are obtained experimentally as 5 and 11 ns, respectively.
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Affiliation(s)
- Ridong Cong
- Hebei Key Laboratory of Optic‐Electronic Information and MaterialsCollege of Physics Science and TechnologyHebei UniversityBaoding071002P. R. China
| | - Shuang Qiao
- Hebei Key Laboratory of Optic‐Electronic Information and MaterialsCollege of Physics Science and TechnologyHebei UniversityBaoding071002P. R. China
| | - Jihong Liu
- Hebei Key Laboratory of Optic‐Electronic Information and MaterialsCollege of Physics Science and TechnologyHebei UniversityBaoding071002P. R. China
| | - Jiansong Mi
- Hebei Key Laboratory of Optic‐Electronic Information and MaterialsCollege of Physics Science and TechnologyHebei UniversityBaoding071002P. R. China
| | - Wei Yu
- Hebei Key Laboratory of Optic‐Electronic Information and MaterialsCollege of Physics Science and TechnologyHebei UniversityBaoding071002P. R. China
| | - Baolai Liang
- Hebei Key Laboratory of Optic‐Electronic Information and MaterialsCollege of Physics Science and TechnologyHebei UniversityBaoding071002P. R. China
| | - Guangsheng Fu
- Hebei Key Laboratory of Optic‐Electronic Information and MaterialsCollege of Physics Science and TechnologyHebei UniversityBaoding071002P. R. China
| | - Caofeng Pan
- Beijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing100083China
- CAS Center for Excellence in NanoscienceNational Center for Nanoscience and Technology (NCNST)Beijing100190P. R. China
| | - Shufang Wang
- Hebei Key Laboratory of Optic‐Electronic Information and MaterialsCollege of Physics Science and TechnologyHebei UniversityBaoding071002P. R. China
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Qiao S, Zhang B, Feng K, Cong R, Yu W, Fu G, Wang S. Large Lateral Photovoltage Observed in MoS 2 Thickness-Modulated ITO/MoS 2/p-Si Heterojunctions. ACS Appl Mater Interfaces 2017; 9:18377-18387. [PMID: 28492306 DOI: 10.1021/acsami.7b04638] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Molybdenum disulfide (MoS2), as a typical two-dimensional (2D) material, has attracted extensive attention in recent years because of its fascinating optical and electric properties. However, the applications of MoS2 have been mainly in photovoltaic devices, field-effect transistors, photodetectors, and gas sensors. Here, it is demonstrated that MoS2 can be found another important application in position sensitive detector (PSD) based on lateral photovoltaic effect (LPE) in it. The ITO/MoS2(3, 5, 7, 9, 10, 20, 50, 100 nm)/p-Si heterojunctions were successfully prepared with vertically standing nanosheet structure of MoS2. Because of the special structure and the strong light absorption of the relatively thick MoS2 film, the ITO/MoS2/p-Si heterojunction exhibits an abnormal thickness-dependent LPE, which can be ascribed to the n- to p-type transformation of MoS2. Moreover, the LPE of ITO/MoS2/p-Si structure improves greatly because of forward enhanced built-in field by type transformation in a wide spectrum response ranging from visible to near-infrared, especially the noticeable improvement in infrared region, indicating its great potential application in infrared PSDs. This work not only suggest that the ITO/MoS2/p-Si heterojunction shows great potential in LPE-based sensors, but also unveils the importance of type transformation of MoS2 in MoS2-based photoelectric devices besides strong light absorption and suitable bandgap.
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Affiliation(s)
- Shuang Qiao
- Hebei Key Laboratory of Optic-Electronic Information and Materials, College of Physics Science and Technology, Hebei University , Baoding 071002, P. R. China
| | - Bin Zhang
- Hebei Key Laboratory of Optic-Electronic Information and Materials, College of Physics Science and Technology, Hebei University , Baoding 071002, P. R. China
| | - Kaiyu Feng
- Hebei Key Laboratory of Optic-Electronic Information and Materials, College of Physics Science and Technology, Hebei University , Baoding 071002, P. R. China
| | - Ridong Cong
- Hebei Key Laboratory of Optic-Electronic Information and Materials, College of Physics Science and Technology, Hebei University , Baoding 071002, P. R. China
| | - Wei Yu
- Hebei Key Laboratory of Optic-Electronic Information and Materials, College of Physics Science and Technology, Hebei University , Baoding 071002, P. R. China
| | - Guangsheng Fu
- Hebei Key Laboratory of Optic-Electronic Information and Materials, College of Physics Science and Technology, Hebei University , Baoding 071002, P. R. China
| | - Shufang Wang
- Hebei Key Laboratory of Optic-Electronic Information and Materials, College of Physics Science and Technology, Hebei University , Baoding 071002, P. R. China
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Zhou Z, Janco M, Cong R, Lee D, Shan CLP, Boopalachandran P, Shi Z, Miller MD, Winniford B, Huang T, Herceg E, Salazar I, Pangburn T, Sandlin A, Fan L, Wu J. Simultaneous measurement of the molecular weight distribution and 5-ethylidene-2-norbornene content across the molecular weight distribution of ethylene-propylene-diene terpolymer via a new size exclusion chromatography-ultraviolet-refractive index method. J Appl Polym Sci 2016. [DOI: 10.1002/app.43911] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Z. Zhou
- Dow Chemical Company; Freeport Texas 77541
| | - M. Janco
- Dow Chemical Company; Collegeville Pennsylvania 19426
| | - R. Cong
- Dow Chemical Company; Freeport Texas 77541
| | - D. Lee
- Dow Chemical Company; Midland Michigan 48667
| | | | | | - Z. Shi
- Dow Chemical Company; Freeport Texas 77541
| | | | | | - T. Huang
- Dow Chemical Company; Freeport Texas 77541
| | - E. Herceg
- Dow Chemical Company; Union Kentucky 41091
| | - I. Salazar
- Dow Chemical Company; Freeport Texas 77541
| | - T. Pangburn
- Dow Chemical Company; Midland Michigan 48667
| | - A. Sandlin
- Dow Chemical Company; Freeport Texas 77541
| | - L. Fan
- Dow Chemical Company; Freeport Texas 77541
| | - J. Wu
- Dow Chemical Company; Collegeville Pennsylvania 19426
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8
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Zhang Y, Cong R, Zhao W, Li Y, Jin C, Yu W, Fu G. Improved hetero-interface passivation by microcrystalline silicon oxide emitter in silicon heterojunction solar cells. Sci Bull (Beijing) 2016. [DOI: 10.1007/s11434-016-1065-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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9
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Lu S, Cong R, Zhu S, Zhao X, Liu J, S Tse J, Meng S, Yang B. pH-Dependent Synthesis of Novel Structure-Controllable Polymer-Carbon NanoDots with High Acidophilic Luminescence and Super Carbon Dots Assembly for White Light-Emitting Diodes. ACS Appl Mater Interfaces 2016; 8:4062-8. [PMID: 26791442 DOI: 10.1021/acsami.5b11579] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
We use a pH-dependent solubility equilibrium to develop a one-pot aqueous synthesis of polymer carbon nanodots with novel structures. The chemical structure and photoluminescence (PL) were heavily influenced by the synthesis pH, with cross-linked polymer-carbon film (pH > 7), polymer carbon nanosheets (3 < pH < 7), and amorphous carbon structures (1 < pH < 3) achieved by altering the initial pH. Although pH-dependent structures frequently occur in typical semiconductors and supramolecular architectures involving metal, this is the first experimental work describing it in carbon nanodots. Supersmall carbon nanodots (SCNDs, ∼0.5 nm) were obtained at pH < 1; their direct white emission can be easily applied as an inexpensive color-changing layer in white LEDs. Investigation of the PL mechanism of the SCNDs revealed an uncommon multilevel highly emissive recombination channel, which could be possibly derived from the wide distributions of surface-state PL centers. Theoretical calculation of the single layer of the carbon dots further explored their band gap changes.
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Affiliation(s)
- Siyu Lu
- Department of Physics and Engineering Physics, University of Saskatchewan , Saskatoon, Saskatchewan S7N 5E2, Canada
| | - Ridong Cong
- Hebei Key Laboratory of Optic Electronic Information Materials, College of Physics Science and Technology, Hebei University , Baoding 071002, P. R. China
| | - Shoujun Zhu
- Department of chemistry, Stanford University , Stanford, California 94305, United States
| | | | | | - John S Tse
- Department of Physics and Engineering Physics, University of Saskatchewan , Saskatoon, Saskatchewan S7N 5E2, Canada
| | - Sheng Meng
- Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences , 100190 Beijing, China
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10
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Zhou Z, Miller MD, Lee D, Cong R, Klinker C, Huang T, Li Pi Shan C, Winniford B, deGroot AW, Fan L, Karjala T, Beshah K. NMR Study of the Separation Mechanism of Polyethylene–Octene Block Copolymer by HT-LC with Graphite. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b01731] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Z. Zhou
- The Dow Chemical Company, 2301 North Brazosport Boulevard, Freeport, Texas 77541, United States
| | - M. D. Miller
- The Dow Chemical Company, 2301 North Brazosport Boulevard, Freeport, Texas 77541, United States
| | - D. Lee
- The Dow Chemical Company, 2301 North Brazosport Boulevard, Freeport, Texas 77541, United States
| | - R. Cong
- The Dow Chemical Company, 2301 North Brazosport Boulevard, Freeport, Texas 77541, United States
| | - C. Klinker
- The Dow Chemical Company, 2301 North Brazosport Boulevard, Freeport, Texas 77541, United States
| | - T. Huang
- The Dow Chemical Company, 2301 North Brazosport Boulevard, Freeport, Texas 77541, United States
| | - C. Li Pi Shan
- The Dow Chemical Company, 2301 North Brazosport Boulevard, Freeport, Texas 77541, United States
| | - B. Winniford
- The Dow Chemical Company, 2301 North Brazosport Boulevard, Freeport, Texas 77541, United States
| | - A. W. deGroot
- The Dow Chemical Company, 2301 North Brazosport Boulevard, Freeport, Texas 77541, United States
| | - L. Fan
- The Dow Chemical Company, 2301 North Brazosport Boulevard, Freeport, Texas 77541, United States
| | - T. Karjala
- The Dow Chemical Company, 2301 North Brazosport Boulevard, Freeport, Texas 77541, United States
| | - K. Beshah
- The Dow Chemical Company, 2301 North Brazosport Boulevard, Freeport, Texas 77541, United States
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11
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Zhao Q, Yu WW, Sun Y, Cong R, Xiang Q, Qin N, He XQ, Dai N. WO 3 Nanoparticles Based Gas Sensor for Acetone Detection with High Sensitivity and Fast Response. ACTA ACUST UNITED AC 2015. [DOI: 10.1166/sl.2015.3546] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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12
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Mekap D, Malz F, Brüll R, Zhou Z, Cong R, deGroot AW, Parrott AR. Studying the Interactions of Polyethylene with Graphite in the Presence of Solvent by High Temperature Thermal Gradient Interactive Chromatography, Thermal Gradient Nuclear Magnetic Resonance Spectroscopy, and Solution Differential Scanning Calorimetry. Macromolecules 2014. [DOI: 10.1021/ma5017902] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- D. Mekap
- Division
Plastics, Fraunhofer Institute for Structural Durability and System Reliability LBF, Schlossgartenstrasse 6, 64289 Darmstadt, Germany
| | - F. Malz
- Division
Plastics, Fraunhofer Institute for Structural Durability and System Reliability LBF, Schlossgartenstrasse 6, 64289 Darmstadt, Germany
| | - R. Brüll
- Division
Plastics, Fraunhofer Institute for Structural Durability and System Reliability LBF, Schlossgartenstrasse 6, 64289 Darmstadt, Germany
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13
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Yin G, Yin H, Sun M, Zhong L, Zhang J, Cong R, Gao W, Cui Q. New approach to improve the conductivity of apatite-type lanthanum germanate La9.33Ge6O26 as electrolyte for IT-SOFCs. RSC Adv 2014. [DOI: 10.1039/c4ra00713a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
La9.33Ge6O26 pellets synthesized by a molten-salt method exhibit higher conductivity owing to the high density and the avoidance of La2GeO5.
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Affiliation(s)
- Guangchao Yin
- State Key Laboratory of Superhard Materials
- Jilin University
- Changchun, China
| | - Hong Yin
- State Key Laboratory of Superhard Materials
- Jilin University
- Changchun, China
| | - Meiling Sun
- State Key Laboratory of Superhard Materials
- Jilin University
- Changchun, China
| | - Linhong Zhong
- State Key Laboratory of Superhard Materials
- Jilin University
- Changchun, China
| | - Junkai Zhang
- State Key Laboratory of Superhard Materials
- Jilin University
- Changchun, China
| | - Ridong Cong
- State Key Laboratory of Superhard Materials
- Jilin University
- Changchun, China
| | - Wei Gao
- State Key Laboratory of Superhard Materials
- Jilin University
- Changchun, China
| | - Qiliang Cui
- State Key Laboratory of Superhard Materials
- Jilin University
- Changchun, China
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14
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Cong R, Liu X, Cui H, Zhang J, Wu X, Wang Q, Zhu H, Cui Q. The plasma assisted synthesis and high pressure studies of the structural and elastic properties of metal nitrides XN (X = Sc, Y). CrystEngComm 2014. [DOI: 10.1039/c3ce42643b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
This paper investigated the arc discharge synthesis of ScN and YN and the high pressure behaviors of the samples.
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Affiliation(s)
- Ridong Cong
- State Key Laboratory of Superhard Materials
- Jilin University
- Changchun 130012, People's Republic of China
| | - Xiaoyu Liu
- College of Physics
- Jilin University
- Changchun 130012, People's Republic of China
| | - Hang Cui
- State Key Laboratory of Superhard Materials
- Jilin University
- Changchun 130012, People's Republic of China
| | - Jian Zhang
- State Key Laboratory of Superhard Materials
- Jilin University
- Changchun 130012, People's Republic of China
| | - Xiaoxin Wu
- State Key Laboratory of Superhard Materials
- Jilin University
- Changchun 130012, People's Republic of China
| | - Qiushi Wang
- State Key Laboratory of Superhard Materials
- Jilin University
- Changchun 130012, People's Republic of China
| | - Hongyang Zhu
- State Key Laboratory of Superhard Materials
- Jilin University
- Changchun 130012, People's Republic of China
| | - Qiliang Cui
- State Key Laboratory of Superhard Materials
- Jilin University
- Changchun 130012, People's Republic of China
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15
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Liu X, Cong R, Cao L, Liu S, Cui H. The structure, morphology and photocatalytic activity of graphene–TiO2 multilayer films and charge transfer at the interface. NEW J CHEM 2014. [DOI: 10.1039/c3nj01003a] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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17
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Mekap D, Macko T, Brüll R, Cong R, deGroot AW, Parrott A, Yau W. One-Step Method for Separation and Identification of n-Alkanes/Oligomers in HDPE Using High-Temperature High-Performance Liquid Chromatography. Macromolecules 2013. [DOI: 10.1021/ma401146a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- D. Mekap
- Division Plastics, Group Material
Analytics, Fraunhofer Institute for Structural Durability and System Reliability, Schlossgartenstrasse 6, 64289
Darmstadt, Germany
| | - T. Macko
- Division Plastics, Group Material
Analytics, Fraunhofer Institute for Structural Durability and System Reliability, Schlossgartenstrasse 6, 64289
Darmstadt, Germany
| | - R. Brüll
- Division Plastics, Group Material
Analytics, Fraunhofer Institute for Structural Durability and System Reliability, Schlossgartenstrasse 6, 64289
Darmstadt, Germany
| | - R. Cong
- Performance
Plastics Characterization, The Dow Chemical Company, 2301 Brazosport Blvd., Freeport,
Texas 77541, United States
| | - A. W. deGroot
- Performance
Plastics Characterization, The Dow Chemical Company, 2301 Brazosport Blvd., Freeport,
Texas 77541, United States
| | - A. Parrott
- Performance
Plastics Characterization, The Dow Chemical Company, 2301 Brazosport Blvd., Freeport,
Texas 77541, United States
| | - W. Yau
- Performance
Plastics Characterization, The Dow Chemical Company, 2301 Brazosport Blvd., Freeport,
Texas 77541, United States
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18
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Xu Y, Zhu H, Ma C, Zhu P, Cong R, Wu X, Gao W, Cui Q. Pressure-induced structural phase transition in AlN:Mg and AlN:Co nanowires. J SOLID STATE CHEM 2013. [DOI: 10.1016/j.jssc.2013.03.026] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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19
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Wang Q, Gao W, Shan L, Zhang J, Jin Y, Cong R, Cui Q. One-step growth of Si3N4 stem–branch featured nanostructures: Morphology control by VS and VLS mode. J SOLID STATE CHEM 2011. [DOI: 10.1016/j.jssc.2011.06.041] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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20
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Yang C, Zhu Q, Han Y, Zhu J, Wang H, Cong R, Zhang D. Minimally-invasive total hip arthroplasty will improve early postoperative outcomes: a prospective, randomized, controlled trial. Ir J Med Sci 2009; 179:285-90. [DOI: 10.1007/s11845-009-0437-y] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2009] [Accepted: 09/16/2009] [Indexed: 10/20/2022]
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21
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Wu H, Zhang ZX, Zhao HP, Wu DC, Wu BL, Cong R. Preparation of sodium fluoride-loaded gelatin microspheres, characterization and cariostatic studies. J Microencapsul 2005; 21:889-903. [PMID: 15799544 DOI: 10.1080/02652040400015445] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Sodium fluoride-loaded gelatin microspheres (NaF-GMS) were prepared using double-phase emulsified condensation polymerization. The average diameter of microspheres was (11.33+/-5.56) microm. The drug content and encapsulation efficiency were 8.80% and 76.73%, respectively. The fluoride releasing profiles of NaF-GMS in physiological saline and artificial saliva (pH 4.5, pH 6.8) showed that NaF-GMS had a sustained-release property and fluoride release rate was increased in pH 4.5 artificial saliva. Experiments conducted in rabbits' oral cavity using NaF-GMS and NaF solution as control revealed NaF-GMS could maintain oral fluoride retention longer than NaF solution. Cariostatic abilities of NaF-GMS including demineralization prohibition in vitro, fluoride deposition in artificial dental plaque and the ability of targeting to cariogenic bacteria were investigated in artificial dental plaque. The results indicated NaF-GMS with lower fluoride concentrations could achieve equivalent cariostatic effect to the concentrated NaF solution, at the same time, could prolong fluoride retention in dental plaque. Microscopic observation showed that NaF-GMS carrying fusion protein of glucan-binding domain could adhere more bacteria than NaF-GMS and this might indicate the possibility of targeting to cariogenic bacteria when NaF-GMS were properly modified.
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Affiliation(s)
- H Wu
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an 710049, PR China
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22
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De Smaele E, Zazzeroni F, Papa S, Nguyen DU, Jin R, Jones J, Cong R, Franzoso G. Induction of gadd45beta by NF-kappaB downregulates pro-apoptotic JNK signalling. Nature 2001; 414:308-13. [PMID: 11713530 DOI: 10.1038/35104560] [Citation(s) in RCA: 593] [Impact Index Per Article: 25.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
In addition to coordinating immune and inflammatory responses, NF-kappaB/Rel transcription factors control cell survival. Normally, NF-kappaB dimers are sequestered in the cytoplasm by binding to inhibitory IkappaB proteins, and can be activated rapidly by signals that induce the sequential phosphorylation and proteolysis of IkappaBs. Activation of NF-kappaB antagonizes apoptosis or programmed cell death by numerous triggers, including the ligand engagement of 'death receptors' such as tumour-necrosis factor (TNF) receptor. The anti-apoptotic activity of NF-kappaB is also crucial to oncogenesis and to chemo- and radio-resistance in cancer. Cytoprotection by NF-kappaB involves the activation of pro-survival genes; however, its basis remains poorly understood. Here we report that NF-kappaB complexes downregulate the c-Jun amino-terminal kinase (JNK) cascade, thus establishing a link between the NF-kappaB and the JNK pathways. This link involves the transcriptional upregulation of gadd45beta/myd118 (ref. 4), which downregulates JNK signalling induced by the TNF receptor (TNF-R). This NF-kappaB-dependent inhibition of the JNK pathway is central to the control of cell death. Our findings define a protective mechanism that is mediated by NF-kappaB complexes and establish a role for the persistent activation of JNK in the apoptotic response to TNF-alpha.
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Affiliation(s)
- E De Smaele
- The Gwen Knapp Center for Lupus and Immunology research, The University of Chicago, Illinois 60637, USA
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23
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Lei X, Wang J, Cong R. [Preparation and evaluation of new ion-exchange chromatographic stationary phase for the use in high performance liquid chromatography]. Se Pu 1999; 17:431-4. [PMID: 12552875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/28/2023] Open
Abstract
A new method for the bonding of diethylamine(DEA) on the surface of silica to prepare novel hydrophilic packings for HPLC has been studied. After allyl glycidyl ether being synthesized, the Si-DEA anion-exchange bonded phase was prepared by the reaction of the double bond in allyl group with Si-H silica. The bonded phases obtained were characterized by elemental analysis, diffuse reflectance infrared Fourier transform(DRIFT) spectroscopy and HPLC evaluation. The methods were used for both porous silica and monodisperse non-porous silica. The contents of carbon, hydrogen and nitrogen of porous Si-DEA packing (MPS-DEA) were 3.31%, 0.95% and 1.34% respectively and those of monodisperse non-porous Si-DEA packing (NPS-DEA) were 2.55%, 0.97% and 0.96% respectively. The diethylamine absorption peak can be observed at 2970 cm-1 from the Si-DEA silica DRIFT spectrum. These data revealed that the diethylamine had been bonded on MPS-DEA and NPS-DEA packings. In HPLC tests, nucleotides and nucleosides such as cytosine, uracil, cytidine-5'-monophosphate, adenosine-5'-monophosphate, inosine-5'-monophosphate and guanosine-5'-monophosphate were satisfactorily separated on the porous anion-exchange packing (MPS-DEA), and a group of proteins (lysozyme, ribonuclease, ovalbumin, bovine serum albumin, insulin and gamma-globulin) were separated within 15 minutes successfuly. All test results indicated that the new method for preparing better anion-exchange silica packings is effective for both porous silica and monodiperse non-porous silica.
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Affiliation(s)
- X Lei
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116012, China
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24
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Shen L, Xiong B, Cong R, Wang J. [Cibacron blue F3GA-attached 2 microns non-porous monodisperse silicas for affinity chromatography]. Se Pu 1999; 17:427-30. [PMID: 12552874] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/28/2023] Open
Abstract
Non-porous monodisperse silica (NPS), 2 microns in diameter, was modified with 3-aminopropyltriethoxysilane for immobilization of Cibacron Blue F3GA (CB), a packing of NPS-ACB for affinity chromatography was obtained. Up to 2 mg of CB could be attached to 1 mL of NPS beads. There was no obvious leakage of dye from NPS-ACB. Oval was not retained by the column, while Lys was specifically adsorbed. The adsorption of Lys varied with pH values and ionic strengths. In addition, alpha-globulin could not be retained by the packing, while beta- and gamma-globulin could be adsorbed on the column. gamma-Globulin was able to be eluted by 20% 1,6-hexanediol and 1 mol/L KCl, while beta-globulin was not able to be eluted by the same eluent. The difference in affinity interaction could be used to separate the three globulins. Furthermore, the column could be used for separation and preparation of Lys from hen egg white. The chromatograms of Lys on non-porous silica diethylamine column (NPS-DEA) showed that retention time of one peak of the crude Lys prepared was in accordance with Lys's, so it could be said that NPS-ACB column can be used for preparation in a small scale.
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Affiliation(s)
- L Shen
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116012, China
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25
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Newcomb R, Szoke B, Palma A, Wang G, Chen XH, Hopkins W, Cong R, Miller J, Urge L, Tarczy-Hornoch K, Loo JA, Dooley DJ, Nadasdi L, Tsien RW, Lemos J, Miljanich G. Selective peptide antagonist of the class E calcium channel from the venom of the tarantula Hysterocrates gigas. Biochemistry 1998; 37:15353-62. [PMID: 9799496 DOI: 10.1021/bi981255g] [Citation(s) in RCA: 325] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We describe the first potent and selective blocker of the class E Ca2+channel. SNX-482, a novel 41 amino acid peptide present in the venom of the African tarantula, Hysterocrates gigas, was identified through its ability to inhibit human class E Ca2+ channels stably expressed in a mammalian cell line. An IC50 of 15-30 nM was obtained for block of the class E Ca2+ channel, using either patch clamp electrophysiology or K+-evoked Ca2+ flux. At low nanomolar concentrations, SNX-482 also blocked a native resistant or R-type Ca2+ current in rat neurohypophyseal nerve terminals, but concentrations of 200-500 nM had no effect on R-type Ca2+ currents in several types of rat central neurons. The peptide has the sequence GVDKAGCRYMFGGCSVNDDCCPRLGCHSLFSYCAWDLTFSD-OH and is homologous to the spider peptides grammatoxin S1A and hanatoxin, both peptides with very different ion channel blocking selectivities. No effect of SNX-482 was observed on the following ion channel activities: Na+ or K+ currents in several cultured cell types (up to 500 nM); K+ current through cloned potassium channels Kv1.1 and Kv1. 4 expressed in Xenopus oocytes (up to 140 nM); Ca2+ flux through L- and T-type Ca2+ channels in an anterior pituitary cell line (GH3, up to 500 nM); and Ba2+ current through class A Ca2+ channels expressed in Xenopus oocytes (up to 280 nM). A weak effect was noted on Ca2+ current through cloned and stably expressed class B Ca2+ channels (IC50 > 500 nM). The unique selectivity of SNX-482 suggests its usefulness in studying the diversity, function, and pharmacology of class E and/or R-type Ca2+ channels.
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Affiliation(s)
- R Newcomb
- Elan Pharmaceuticals Inc., Menlo Park, California 94025, USA
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26
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Wang P, Cong R, Wang J, Zhang L. [Determination of the active flavonoids in silymarine]. Se Pu 1998; 16:510-2. [PMID: 11938915] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023] Open
Abstract
The active flavonoids in silymarine extract prominently consist of silychristin, silydianin, silybin (A and B) and isosilybin (A and B). Among these active flavonoids, silybin is the most important one. It is often used to treat liver disorders. An HPLC method for determining thg active flavonoids is described in this paper. The components in the extract can be separated by using a reversed-phase system with a C18 column, eluted with methanol and phosphate buffer under gradient conditions, and detected at 280 nm. In comparing with the method of derivatization with 2,4-dinitrophenylhydrazine and detection with UV spectrometry which can only determine the total active flavonoids. The HPLC method not only can separate taxifolin from the flavolignans but also permit individual estimations of silychristin, silydianin, silybin and isosilybin. It has better repeatability. The relative standard deviation is below 2%(n = 5). It can be used for quality control of the crude extracts and the pharmaceutical preparations.
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Affiliation(s)
- P Wang
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116012
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27
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Feng Y, Wu J, Cong R, Wang C, Zong Y, Feng Z. The effect of neferine on foam cell formation by anti-low density lipoprotein oxidation. Curr Med Sci 1998; 18:134-6. [PMID: 10806809 DOI: 10.1007/bf02888520] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/1998] [Indexed: 11/26/2022]
Abstract
Oxidatively modified low density lipoprtein (LDL) plays an important role in atheroslerosis (AS) development. To investigate the role of neferine (Nef) in anti-LDL oxidation and foam cell formation, the lipoprotein was derived and subjected to three different treatments: N-LDL (normal LDL), Cu2+ + LDL and Cu2+ + Nef + LDL. The LDLs were put at 25 degrees C for 24 h and the thiobarbituric acid reactive substance (TBARS) values were determined. They were 0.57 +/- 0.2, 6.01 +/- 0.22 and 2.26 +/- 0.13 nmol/mg protein, respectively. The difference was very significant (P < 0.01) for each two groups by t test. Mouse peritoneal macrophage (M phi) were exposed to 50 micrograms protein/ml of Cu2+ + LDL and Cu2+ + Nef + LDL at 37 degrees C for 60 h. The tryglyceride (TG) and total cholesterol (TC) content in M phi were assayed. The results showed that Cu2+ + LDL was more efficient than Cu2+ + Nef + LDL in stimulating lipid accumulation in M phi (P < 0.001). The study demonstrated that Nef could inhibit Cu(2+)-mediated LDL oxidation and thereby inhibiting macrophage-derived foam cell formation.
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Affiliation(s)
- Y Feng
- Department of Biochemistry, School of Basic Medical Sciences, Tongji Medical University, Wuhan
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28
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Wang P, Wang J, Cong R, Dong B. [Preparation and evaluation of stationary phase of high performance liquid chromatography for the separation of basic solutes]. Se Pu 1997; 15:189-92. [PMID: 15739353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/01/2023] Open
Abstract
A bonded phase for high performance liquid chromatography (HPLC) has been prepared by the new reaction between silica and silicon ether. The ether was synthesized from alkylchlorosilane and pentane-2,4-dione in the presence of imidazole under inert conditions by using anhydrous tetrahydrofuran as solvent. The bonded phase thus obtained was characterized by elemental analysis, diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy and HPLC evaluation. The carbon content was 9.4% and the surface coverage almost attained 3.0micromol/m2 without end-capping. The silanol absorption peaks of the product cannot be observed from the DRIFT spectrum, which revealed that the silanization reaction proceeded thoroughly. The basic solutes, such as aniline, o-toluidine, p-toluidine, N,N-dimethylaniline and pyridine were used as the probe solutes to examine their interaction with the residual silanols on the surface of the products. No buffer or salt was used in the mobile phase for these experiments. In comparison with an acidic solute, such as, phenol, basic aniline eluted in front of phenol, and the ratio of asymmetry of aniline peak to that of the phenol peak was 1.1. Furthermore the relative k' value of p-toluidine to that of o-toluidine was also 1.1. All the results showed that the stationary phase has better quality and reproducibility and can be used for the separation of basic solutes efficiently.
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Affiliation(s)
- P Wang
- Dalian Institute of Chemical Physics, the Chinese Academy of Sciences, Dalian, 116012
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29
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Feng Y, Cong R, Zong Y, Zhang J, Qu S, Deng Y. Regulation of ApoE gene expression in mouse peritoneal macrophages by VLDL. Curr Med Sci 1997; 17:65-7, 97. [PMID: 9639790 DOI: 10.1007/bf02888235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/1996] [Indexed: 11/25/2022]
Abstract
Mouse peritoneal macrophages (MPM) were incubated with ApoE-poor VLDL or ApoE-rich VLDL at same concentrations for 24 h. The ApoE mRNA content increased in both groups than that in control and the highest ApoE mRNA content was seen in MPM incubated with ApoE-poor VLDL. The results suggest that VLDL could stimulate ApoE gene expression in MPM and the ApoE-poor VLDL has more pronounced effect. We think that the ApoE secreted by MPM may be incorporated into VLDL, especially the ApoE-poor VLDL, and thereby enhance the uptake of those lipoproteins by MPM or other local cells via ApoE-mediated receptor pathways.
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Affiliation(s)
- Y Feng
- Department of Biochemistry, Tongji Medical University, Wuhan
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30
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Newcomb R, Palma A, Fox J, Gaur S, Lau K, Chung D, Cong R, Bell JR, Horne B, Nadasdi L. SNX-325, a novel calcium antagonist from the spider Segestria florentina. Biochemistry 1995; 34:8341-7. [PMID: 7541240 DOI: 10.1021/bi00026a015] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
A novel selective calcium channel antagonist peptide, SNX-325, has been isolated from the venom of the spider Segestria florentina. The peptide was isolated using as bioassays the displacement of radioiodinated omega-conopeptide SNX-230 (MVIIC) from rat brain synaptosomal membranes, as well as the inhibition of the barium current through cloned expressed calcium channels in oocytes. The primary sequence of SNX-325 is GSCIESGKSCTHSRSMKNGLCCPKSRCNCRQIQHRHDYLGKRKYSCRCS, which is a novel amino acid sequence. Solid-phase synthesis resulted in a peptide that is chromatographically identical with the native peptide and which has the same configuration of cysteine residues as the spider venom peptide omega-Aga-IVa [Mintz, I. M., et al., (1992) Nature 355, 827-829]. At micromolar concentrations, SNX-325 is an inhibitor of most calcium, but not sodium or potassium, currents. At nanomolar concentrations, SNX-325 is a selective blocker of the cloned expressed class B (N-type), but not class C (cardiac L), A, or E, calcium channels. SNX-325 is approximately equipotent with the N-channel selective omega-conopeptides (GVIA and MVIIA as well as closely related synthetic derivatives) in blocking the potassium induced release of tritiated norepinephrine from hippocampal slices (IC50s, 0.1-0.5 nM) and in blocking the barium current through cloned expressed N-channels in oocytes (IC50s 3-30 nM). By contrast, SNX-325 is 4-5 orders of magnitude less potent than is SNX-111 (synthetic MVIIA) at displacing radioiodinated SNX-111 from rat brain synaptosomal membranes. SNX-325 will be a useful comparative tool in further defining the function and pharmacology of the N- and possibly other types of high-voltage activated calcium channels.
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Affiliation(s)
- R Newcomb
- Neurex Corporation, Menlo Park, California 94025-1012, USA
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