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Fabrication of a novel electrochemical sensor based on MnFe_(2)O_(4)/graphene modified glassy carbon electrode for the sensitive detection of bisphenol A
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作者 GAO Si-lei TANG Jian-she +1 位作者 XIANG Li LONG Jin-wei 《Journal of Central South University》 SCIE EI CAS CSCD 2024年第6期1856-1869,共14页
Manganese ferrite(MnFe_(2)O_(4))has the advantages of simple preparation,high resistivity,and high crystal symmetry.Herein,we have developed an electrochemical sensor utilizing graphene and MnFe_(2)O_(4) nanocomposite... Manganese ferrite(MnFe_(2)O_(4))has the advantages of simple preparation,high resistivity,and high crystal symmetry.Herein,we have developed an electrochemical sensor utilizing graphene and MnFe_(2)O_(4) nanocomposites modified glassy carbon electrode(GCE),which is very efficient and sensitive to detect bisphenol A(BPA).MnFe_(2)O_(4)/graphene(GR)was synthesized by immobilizing the MnFe_(2)O_(4) microspheres on the graphene nanosheets via a simple one-pot solvothermal method.The morphology and structure of the MnFe_(2)O_(4)/GR nanocomposite have been characterized through scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FT-IR),X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS).In addition,electrochemical properties of the modified materials are comparably explored by means of cyclic voltammetry(CV),electrochemical impedance spectroscopy(EIS)and differential pulse voltammetry(DPV).Under the optimal conditions,the proposed electrochemical sensor for the detection of BPA has a linear range of 0.8-400μmol/L and a detection limit of 0.0235μmol/L(S/N=3)with high sensitivity,good selectivity and high stability.In addition,the proposed sensor was used to measure the content of BPA in real water samples with a recovery rate of 97.94%-104.56%.At present,the synthesis of MnFe_(2)O_(4)/GR provides more opportunities for the electrochemical detection of BPA in practical applications. 展开更多
关键词 MnFe_(2)O_(4) GRAPHENE electrochemical sensor bisphenol A
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Benzo[4,5]imidazo[1,2-a]pyrimidine-based structure-inherent targeting fluorescent sensor for imaging lysosomal viscosity and diagnosis of lysosomal storage disorders
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作者 Jiao Chen Zihan Zhang +7 位作者 Guojin Sun Yudi Cheng Aihua Wu Zefan Wang Wenwen Jiang Fulin Chen Xiuying Xie Jianli Li 《Chinese Chemical Letters》 SCIE CAS CSCD 2024年第11期454-460,共7页
Benzo[4,5]imidazo[1,2-a]pyrimidine-based derivatives play crucial roles in medicines,pesticides,tracers and photoelectric materials.However,their synthesis approach still needs to be optimized,and their fluorescent pr... Benzo[4,5]imidazo[1,2-a]pyrimidine-based derivatives play crucial roles in medicines,pesticides,tracers and photoelectric materials.However,their synthesis approach still needs to be optimized,and their fluorescent properties in intracellular microenvironment are unclear.Here,a Cu(II)-catalyzed cascade coupling cyclization reaction was successfully developed to synthesize benzo[4,5]imidazo[1,2-a]pyrimidine scaffold with mild reaction conditions,broad substrate scopes and high yields.After a system study,we found that compound 4aa displayed an optimal viscosity-specific response with remarkable fluorescence enhancement(102-fold)for glycerol at 490 nm.Particularly,4aa possessed excellent structure-inherent targeting(SIT)capability for lysosome(P=0.95)with high p H stability and large Stokes shift.Importantly,4aa was validated for its effectiveness in diagnosing lysosomal storage disorders(LSD)in living cells.The 4aa also showed its potential to map the micro-viscosity and its metabolism process in zebrafish.This work not only affords an efficient protocol to fabricate benzo[4,5]imidazo[1,2-a]pyrimidine derivatives,reveals this skeleton has excellent SIT features for lysosome,but also manifests that 4aa can serve as a practical tool to monitor lysosomal viscosity and diagnose LSD. 展开更多
关键词 Fluorescent sensor Benzo[4 5]imidazo[1 2-a]pyrimidine Lysosome VISCOSITY Lysosomal storage disorders Structure-inherent targeting Fluorescence imaging
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Comparison of displacement damage effects on the dark signal in CMOS image sensors induced by CSNS back-n and XAPR neutrons 被引量:1
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作者 Yuan-Yuan Xue Zu-Jun Wang +3 位作者 Wu-Ying Ma Min-Bo Liu Bao-Ping He Shi-Long Gou 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2024年第10期29-40,共12页
This study investigates the effects of displacement damage on the dark signal of a pinned photodiode CMOS image sensor(CIS)following irradiation with back-streaming white neutrons from white neutron sources at the Chi... This study investigates the effects of displacement damage on the dark signal of a pinned photodiode CMOS image sensor(CIS)following irradiation with back-streaming white neutrons from white neutron sources at the China spallation neutron source(CSNS)and Xi'an pulsed reactor(XAPR).The mean dark signal,dark signal non-uniformity(DSNU),dark signal distribution,and hot pixels of the CIS were compared between the CSNS back-n and XAPR neutron irradiations.The nonionizing energy loss and energy distribution of primary knock-on atoms in silicon,induced by neutrons,were calculated using the open-source package Geant4.An analysis combining experimental and simulation results showed a noticeable proportionality between the increase in the mean dark signal and the displacement damage dose(DDD).Additionally,neutron energies influence DSNU,dark signal distribution,and hot pixels.High neutron energies at the same DDD level may lead to pronounced dark signal non-uniformity and elevated hot pixel values. 展开更多
关键词 Displacement damage effects CMOS image sensor(CIS) CSNS back-n XAPR neutrons Geant4 Dark signal non-uniformity(DSNU)
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基于Nb掺杂Co_(3)O_(4)的高性能对二甲苯气体传感器 被引量:1
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作者 冀小华 曹开法 +2 位作者 李蒙 邓赞红 孟钢 《半导体技术》 CAS 北大核心 2024年第6期524-530,共7页
p型Co_(3)O_(4)具有优异的挥发性有机化合物(VOC)催化氧化活性,但其在空气中呈现空穴累积层(HAL)构型,导致本征Co_(3)O_(4)传感器的VOC响应较弱。利用共沉淀法合成了0~5%Nb掺杂的Co_(3)O_(4)纳米材料,缺陷与形貌表征结果表明高价Nb掺杂... p型Co_(3)O_(4)具有优异的挥发性有机化合物(VOC)催化氧化活性,但其在空气中呈现空穴累积层(HAL)构型,导致本征Co_(3)O_(4)传感器的VOC响应较弱。利用共沉淀法合成了0~5%Nb掺杂的Co_(3)O_(4)纳米材料,缺陷与形貌表征结果表明高价Nb掺杂剂可诱导p型Co_(3)O_(4)发生晶格畸变及形貌改变,为对二甲苯气敏特性的提升发挥了重要作用。气敏测试结果表明:在最佳工作温度150℃下,3%Nb-Co_(3)O_(4)传感器对体积分数为100×10^(-6)的对二甲苯的响应从1.3(纯Co_(3)O_(4))提高到14;其选择性也得到了改善,可通过线性判别分析(LDA)准确识别9种不同气体。在为期15 d的稳定性测试中,其性能未有明显衰减。3%Nb-Co_(3)O_(4)表现出优异的对二甲苯传感器特性,为高性能p型金属氧化物半导体VOC传感器的设计提供了参考。 展开更多
关键词 气体传感器 Nb掺杂Co_(3)O_(4) 选择性 气体响应 对二甲苯
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Nb掺杂对Ca_(0.94)Ce_(0.06)Bi_(4)Ti_(4)O_(15)铋层状高温压电陶瓷电学性能影响研究
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作者 李恺 伍子成 +2 位作者 沈宗洋 骆雯琴 宋福生 《中国陶瓷》 CAS CSCD 北大核心 2024年第1期16-21,共6页
采用固相反应法制备了Ca_(0.94)Ce_(0.06)Bi_(4)Ti_(4-x)Nb_(x)O_(15)(CCBTN)铋层状高温压电陶瓷,研究了B位Nb掺杂对陶瓷晶体结构、微观形貌、介电、压电性能的影响规律。结果表明:制备的CCBTN陶瓷均具有单一的铋层状结构相,少量Nb掺杂... 采用固相反应法制备了Ca_(0.94)Ce_(0.06)Bi_(4)Ti_(4-x)Nb_(x)O_(15)(CCBTN)铋层状高温压电陶瓷,研究了B位Nb掺杂对陶瓷晶体结构、微观形貌、介电、压电性能的影响规律。结果表明:制备的CCBTN陶瓷均具有单一的铋层状结构相,少量Nb掺杂有利于陶瓷压电常数及热稳定性能的提升。当Nb掺杂量x=0.06时,陶瓷具有最高的压电常数(d33=19.2pC·N^(-1)),是纯CBT陶瓷压电常数(d33=8 p C·N^(-1))的2.4倍,且退火至500℃时其压电常数仍保持室温值的90%以上,表现出较优异的热稳定性。同时,该陶瓷具有高的居里温度(Tc=769℃)、低的介电损耗(tanδ=0.65%)及高的电阻率(ρdc=2.0×10^(7)Ω·cm@500℃),是高温压电传感器制作的优异候选材料。 展开更多
关键词 高温压电陶瓷 铋层状结构 CaBi_(4)Ti_(4)O_(15) Nb掺杂 压电传感器
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用于H_(2)PO_(4)^(-)检测的比率型荧光探针合成及性能研究
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作者 郭昌晟 陈君霞 +3 位作者 刘忆茹 卢钰盛 董智云 席福贵 《化学试剂》 CAS 2024年第6期33-38,共6页
设计合成了一种基于吖啶-苯并咪唑鎓的大环受体ABIM,可作为H_(2)PO_(4)^(-)的荧光比率传感器。借助荧光光谱研究了受体ABIM对H_(2)PO_(4)^(-)的选择性识别,在大环受体ABIM的乙腈溶液中加入H_(2)PO_(4)^(-)后,在426 nm处荧光发射明显“... 设计合成了一种基于吖啶-苯并咪唑鎓的大环受体ABIM,可作为H_(2)PO_(4)^(-)的荧光比率传感器。借助荧光光谱研究了受体ABIM对H_(2)PO_(4)^(-)的选择性识别,在大环受体ABIM的乙腈溶液中加入H_(2)PO_(4)^(-)后,在426 nm处荧光发射明显“关闭”,506 nm处荧光发射明显“打开”,溶液荧光颜色由蓝色变为蓝绿色,新的荧光发射峰可能是由于H_(2)PO_(4)^(-)诱导两个受体中的吖啶环之间形成Excimer产生的。ABIM与H_(2)PO_(4)^(-)以1∶1的化学计量比结合,结合常数为(7.13±0.48)×10^(6)L/mol,检出限为2.38×10-7 mol/L,最佳响应时间为2 min。回收实验表明,ABIM可应用于样品中H_(2)PO_(4)^(-)的检测。 展开更多
关键词 吖啶 苯并咪唑鎓 H 2PO-4 大环 比率型荧光探针
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固相法制备Bi_(4)V_(2)O_(11)固体电解质在NH_(3)传感器中的应用
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作者 王政 李跃华 +2 位作者 戴磊 王岭 孟维薇 《陶瓷学报》 CAS 北大核心 2024年第5期1013-1021,共9页
通过固相反应法制备了在中低温下具有高离子导电性的固体电解质Bi_(4)V_(2)O_(11),并以CuV_(2)O_(6)为敏感电极组装成混合电位型NH_(3)传感器。通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)和能谱仪(EDS)分析了固体电解质的相组成和传感... 通过固相反应法制备了在中低温下具有高离子导电性的固体电解质Bi_(4)V_(2)O_(11),并以CuV_(2)O_(6)为敏感电极组装成混合电位型NH_(3)传感器。通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)和能谱仪(EDS)分析了固体电解质的相组成和传感器的微观形貌。结果表明,在中低温(300℃~600℃)下Bi_(4)V_(2)O_(11)的电导率高于传统氧离子导体YSZ。传感器测试结果表明,基于Bi_(4)V_(2)O_(11)作固体电解质CuV_(2)O_(6)作敏感电极的传感器能在300℃~500℃的温度范围内对10 ppm~300 ppm的NH_(3)进行检测,而以YSZ作固体电解质的传感器在300℃~350℃性能下降明显;传感器在400℃下有着最高的灵敏度(-59.15 mV/decade),优于相同条件下以YSZ作固体电解质的传感器(-42.89 mV/decade)。传感器具有稳定的响应,传感器的响应值和NH_(3)浓度的对数值呈现良好的正比例关系。 展开更多
关键词 固体电解质 Bi_(4)V_(2)O_(11) NH_(3)传感器 混合电位型
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检测磷酸铁锂电池热失控气体C_(2)H_(4)的MoS_(2)@c-MOF传感器研究
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作者 张振宇 雷达 +3 位作者 张屹峰 白志刚 张邯平 周渠 《电子元件与材料》 CAS 北大核心 2024年第9期1096-1103,共8页
磷酸铁锂电池由于其固有的放热特性以及在电解液中使用易燃有机溶剂,存在着巨大的热失控风险,可能引发严重的火灾事故,因此对磷酸铁锂电池热失控气体的实时监测已成为当前研究的重点。针对目前SnS_(2)/MoS_(2)气体传感器存在工作温度高... 磷酸铁锂电池由于其固有的放热特性以及在电解液中使用易燃有机溶剂,存在着巨大的热失控风险,可能引发严重的火灾事故,因此对磷酸铁锂电池热失控气体的实时监测已成为当前研究的重点。针对目前SnS_(2)/MoS_(2)气体传感器存在工作温度高、灵敏度低等难题,基于导电金属有机框架c-MOF在提升导电性能和增强选择性方面的独特优势,开展了SnS_(2)/MoS_(2)@c-MOF气敏材料制备、C_(2)H_(4)传感特性及检测机理研究。首先利用水热法成功制备了SnS_(2)@c-MOF和MoS_(2)@c-MOF复合气敏材料,并利用XRD和SEM表征手段验证了复合气敏材料的成功制备。然后,制成了平面式SnS_(2)@c-MOF和MoS_(2)@c-MOF传感器,测试了传感器对C_(2)H_(4)的浓度响应、响应恢复时间和稳定性。结果表明,MoS_(2)@c-MOF传感器对10ppm C_(2)H_(4)气体的响应值为4.42%,响应时间/恢复时间为121 s/124 s,优于SnS_(2)@c-MOF传感器,同时具有较好的长期稳定性。最后,基于密度泛函理论,从吸附能、吸附距离、态密度和电荷转移角度对比分析了SnS_(2)@c-MOF和MoS_(2)@c-MOF材料对C_(2)H_(4)的吸附性能和响应特性。本文研究成果为开发用于检测磷酸铁锂电池热失控产生的C_(2)H_(4)气体的高性能MoS_(2)@c-MOF传感器奠定了基础。 展开更多
关键词 磷酸铁锂电池 热失控气体 C_(2)H_(4) SnS_(2)/MoS_(2)@c-MOF 传感器
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基于Fe_(3)O_(4)-MoS_(2)-全氟磺酸纳米复合材料的铅离子电化学传感器
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作者 刘鑫 刘士兴 +1 位作者 邵佳豪 胡海兵 《微纳电子技术》 CAS 2024年第9期65-73,共9页
采用Fe_(3)O_(4)-MoS_(2)-全氟磺酸复合材料修饰玻碳电极(GCE),基于电化学传感原理,使用阳极方波伏安法检测水中微量的铅离子。通过扫描电子显微镜(SEM)、能量色散X射线光谱仪(EDS)、Raman光谱分析仪和X射线光电子能谱仪(XPS)进行物理... 采用Fe_(3)O_(4)-MoS_(2)-全氟磺酸复合材料修饰玻碳电极(GCE),基于电化学传感原理,使用阳极方波伏安法检测水中微量的铅离子。通过扫描电子显微镜(SEM)、能量色散X射线光谱仪(EDS)、Raman光谱分析仪和X射线光电子能谱仪(XPS)进行物理表征。结果表明Fe_(3)O_(4)已较均匀地分布在MoS_(2)上。为了得到良好的实验效果,优化醋酸盐(Hac-NaAc)缓冲溶液的pH值为3.6,最佳沉积时间为120 s,最佳沉积电位为-0.6 V,在滴加5μL的Fe_(3)O_(4)-MoS_(2)和5μL的全氟磺酸条件下进行测试,实验结果表明在0.1~0.6μmol·L^(-1)铅离子浓度范围,Fe_(3)O_(4)-MoS_(2)-全氟磺酸-GCE传感器的线性度良好,灵敏度和检测限分别为25.05μA/(μmol·L^(-1))和0.11μmol·L^(-1)。该检测方法快速便捷,具有低成本、高效率和易操作的特点。 展开更多
关键词 电化学传感器 Fe_(3)O_(4)-MoS_(2)-全氟磺酸 方波伏安法 铅离子 重金属检测
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Na_(3)V_(2)(PO_(4))_(3)的制备及其对二氧化碳的敏感性能研究
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作者 郝建淦 朱羽双 郑晓虹 《山东化工》 CAS 2024年第7期37-39,共3页
由于温室效应越来越严重,开发一种性能优异的二氧化碳传感器对其进行高效、准确地检测具有现实意义。本论文旨在于能够成功地制备出Na_(3)V_(2)(PO_(4))_(3)试样来对CO_(2)的气敏性能进行研究。采用高温固相球磨法以及溶胶凝胶法制备了... 由于温室效应越来越严重,开发一种性能优异的二氧化碳传感器对其进行高效、准确地检测具有现实意义。本论文旨在于能够成功地制备出Na_(3)V_(2)(PO_(4))_(3)试样来对CO_(2)的气敏性能进行研究。采用高温固相球磨法以及溶胶凝胶法制备了NVP材料,采用高温固相法合成了NASICON粉体,运用XRD、SEM技术研究了NVP与NASICON的晶体结构与微观形貌。以NASICON为固体电解质,以NVP为对电极材料,组装出了片式CO_(2)气体传感器,并进行了气体传感器性能研究。结果表明,传感器的最佳工作温度为150℃,在该温度下的灵敏度为2.03 nA/ppm。 展开更多
关键词 Na_(3)V_(2)(PO_(4))_(3) NASICON 二氧化碳 电化学传感器 气敏性能
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Hierarchical Radial Co3O4 Microcrystal and Application in Gas Sensor 被引量:1
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作者 于欣欣 刘先松 +3 位作者 吴明在 孙兆奇 李广 陈效双 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2014年第1期99-102,I0004,共5页
Three-dimensional (3D) hierarchical Co3O4 microcrystal with radial dendritic morphologies was prepared through hydrothermal reactions followed by subsequent annealing treatment. Structural and morphological characte... Three-dimensional (3D) hierarchical Co3O4 microcrystal with radial dendritic morphologies was prepared through hydrothermal reactions followed by subsequent annealing treatment. Structural and morphological characterizations were performed by X-ray diffraction, scan-ning electron microscopy and transmission electron microscopy. The gas sensing properties of the as-obtained microcrystal were investigated at 110 oC, which revealed that the 3D hierarchical porous Co3O4 microcrystal exhibited high sensitivity to ammonia, as well as a short response time of 10 s. The response characteristic indicates that the sensor has a good stability and reversibility. Detections of toxic and flammable gases, such as ethanol, acetone and benzene were also carried out at a relative low temperature. The results indicate that such hierarchical Co3O4 microcrystal would be a potential material in the field of gas sensing. 展开更多
关键词 CO3O4 HIERARCHICAL Gas sensor Sensitivity
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CaMoO_(4):Ho/Yb温度传感器用发光材料的设计及性能研究 被引量:1
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作者 钟国文 潘盛辉 《电子器件》 CAS 北大核心 2023年第5期1263-1267,共5页
基于高温固相合成法,制备出Yb^(3+)不同离子掺杂浓度的CaMoO_(4):1%Ho^(3+)/x%Yb^(3+)系列发光材料,通过X射线衍射分析、上转换荧光光谱,变温荧光光谱等测试方法,对其发光特性及其温度传感特性进行详细表征,并对其发射和感温的机理进行... 基于高温固相合成法,制备出Yb^(3+)不同离子掺杂浓度的CaMoO_(4):1%Ho^(3+)/x%Yb^(3+)系列发光材料,通过X射线衍射分析、上转换荧光光谱,变温荧光光谱等测试方法,对其发光特性及其温度传感特性进行详细表征,并对其发射和感温的机理进行了分析。研究表明:在Yb^(3+)离子掺杂浓度为4%时,所获得的发光强度最大。在980 nm激发光条件下,发射峰值分别为539 nm、664 nm和755 nm,分别对应Ho^(3+)离子的^(5)F_(4)/^(5)S_(2)→^(5)I_(8)能级跃迁、^(5)F_(5)→^(5)I_(8)能级跃迁和^(5)F_(4)/^(5)S_(2)→^(5)I_(7)能级跃迁,通过荧光强度与不同泵浦激发光功率间的拟合关系,获得Ho^(3+)的^(5)F_(4)/^(5)S_(2)包含两光子和三光子两个过程,^(5)F_(5)则是两光子过程。在300 K即室温条件下,获得了最大绝对灵敏度为0.0075 K^(-1),说明了此上转换材料在室温条件下具有较高的测温灵敏性和应用潜力。 展开更多
关键词 发光材料 温度传感器 绝对灵敏度 CaMoO_(4):Ho^(3+)/Yb^(3+) 泵浦功率
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MWCNT-Nafion/AuNPs/3-MPA修饰玻碳电极测定废水中的4-硝基苯酚
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作者 秦建芳 周福林 +3 位作者 姚陈忠 王柯静 王鑫 杨海英 《化学研究与应用》 CAS 北大核心 2023年第6期1298-1306,共9页
构建了一种电化学传感器MWCNT-Nafion/AuNPs/3-MPA/GCE对4-硝基苯酚(4-NP)具有良好电催化性能。用扫描电镜对自组装膜的形貌进行了表征,用循环伏安法、交流阻抗法、示差脉冲伏安法研究了4-硝基苯酚在修饰电极上的电化学行为。以此材料... 构建了一种电化学传感器MWCNT-Nafion/AuNPs/3-MPA/GCE对4-硝基苯酚(4-NP)具有良好电催化性能。用扫描电镜对自组装膜的形貌进行了表征,用循环伏安法、交流阻抗法、示差脉冲伏安法研究了4-硝基苯酚在修饰电极上的电化学行为。以此材料修饰的玻碳电极受扩散控制,4-NP在该电极表面的反应为两电子转移过程,修饰电极的有效面积是裸电极的2.74倍,采用计时电量法计算了4-硝基苯酚的扩散系数D=5.80×10^(-3)cm^(2)·s^(-1)。修饰电极的响应电流与4-硝基苯酚(4-NP)的浓度在2.0×10^(-6)~4.0×10^(-5)mol·L^(-1)浓度范围内呈良好的线性关系,检出限为0.7μmol·L^(-1)(S/N=3)。该传感器重复性好、稳定性高、有一定的抗干扰性。对实际水样中的4-NP的含量进行了测定,加标回收率在90.7%~107.0%范围之间。 展开更多
关键词 MWCNT-Nafion/AuNPs/3-MPA/GCE 电化学传感器 4-硝基苯酚 扩散系数
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A Fiber Optic Sensor for 2,4-dichlorophenol Analysis based on Optical Composite Oxygen-sensitive Film 被引量:3
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作者 TONG Yilin ZENG Zhihong +2 位作者 YU Kan BAO Jiaqi YIN Juanjuan 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2020年第4期743-749,共7页
A novel fiber optic sensor based on optical composite oxygen-sensitive film was developed for determination of 2,4-dichlorophenol(DCP).The optical composite oxygen-sensitive film consists of tris(2,2’-bipyridyl)dichl... A novel fiber optic sensor based on optical composite oxygen-sensitive film was developed for determination of 2,4-dichlorophenol(DCP).The optical composite oxygen-sensitive film consists of tris(2,2’-bipyridyl)dichloro ruthenium(II)hexahydrate(Ru(bpy)3Cl2)as the fluorescence indicator and iron(III)tetrasulfophthalocyanine(Fe(III)PcTs)as bionic enzyme.A lock-in amplifier was used for detecting the lifetime of the composite oxygen-sensitive film by measuring the phase delay of the sensor head.The different variables affecting the sensor performance were evaluated and optimized.Under the optimal conditions(i e,pH 6.0,25℃,Fe(III)PcTs concentration of 5.0×10^-5 mol/L),the linear detection range,detection limit and response time of the fiber optic sensor are 3.0×10^-7-9.0×10^-5 mol/L,4.8×10^-8 mol/L(S/N=3),and 220 s,respectively.The sensor displays high selectivity,good repeatability and stability,which have good potentials in analyzing DCP concentration in practical water samples. 展开更多
关键词 2 4-dichlorophenol optical composite oxygen-sensitive film fiber optic sensor phase delay
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A New Zn(Ⅱ) Coordination Polymer Constructed from 4-(1H-pyrazol-3-yl)pyridine as Fluorescent Sensor for Fe^(3+) 被引量:1
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作者 LIU Na XING Guang-En +1 位作者 HUANG Xiao-Xiao GUO Jing 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2019年第4期660-666,共7页
A new Zn(Ⅱ) coordination polymer, [Zn(4-PP)(1,4-BDC)?(H_2O)]_n(1, 4-PP = 4-(1 H-pyrazol-3-yl)pyridine, 1,4-H_2BDC = 1,4-benzenedicarboxylic acid), has been synthesized and structurally characterized by single-crystal... A new Zn(Ⅱ) coordination polymer, [Zn(4-PP)(1,4-BDC)?(H_2O)]_n(1, 4-PP = 4-(1 H-pyrazol-3-yl)pyridine, 1,4-H_2BDC = 1,4-benzenedicarboxylic acid), has been synthesized and structurally characterized by single-crystal X-ray diffraction as well as elemental analysis, IR spectra, XRPD and TG. Structural analysis reveals that Zn(Ⅱ) ions are bridged by COO-from 1,4-BDC^(2-)to form a binuclear structure as the second building units(SBUs). Zn_2 clusters can be clarified as 4-connected nodes, so the framework of 1 can be considered as a 2 D(44?62)-sql sheet. Fluorescence measurements show that 1 has highly selective and sensitive detection of Fe^(3+) in water medium. 展开更多
关键词 4-(1H-pyrazol-3-yl)pyridine crystal structure LUMINESCENCE sensor zinc complex
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4-CBA Soft Sensor Based on Fuzzy CMAC Neural Networks 被引量:1
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作者 杜文莉 钱锋 +1 位作者 刘漫丹 张凯 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2005年第3期437-440,共4页
Soft sensor is attractive in dealing with online product quality measurement by virtue of other easily measured variables. In AMOCO PTA (purified terephthalic acid) production process, the unavailability of real-time ... Soft sensor is attractive in dealing with online product quality measurement by virtue of other easily measured variables. In AMOCO PTA (purified terephthalic acid) production process, the unavailability of real-time measurement of 4-CBA makes it impossible for timely adjustment and thereby influences the product quality and the plant economy benefit. In this paper, a kind of FCMAC (fuzzy cerebellar model articulation controller) method is presented to solve the online measurement problem. Different from the conventional CMAC (cerebellar model articulation controller) networks, which has inferior smoothing ability because of its table look-up based technology. Integrating fuzzy model into CMAC networks, it becomes more accurate in functional mapping without weakening its generalization ability. Numerical example and industrial application results show the method proposed here is satisfactory and feasible. 展开更多
关键词 fuzzy CMAC networks 4-carboxybenzaldehyde (4-CBA) purified terephthalic acid plant soft sensor
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A Fiber Optic Sensor for Determination of 2,4-dichlorophenol based on Iron(Ⅱ) Phthalocyanine Catalysis 被引量:2
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作者 王永红 TONG Yilin +4 位作者 黄俊 LI Kun LIU Huichao DING Liyun LI Mingtian 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2015年第6期1317-1320,共4页
A new fi ber optic sensor based on the oxidation of 2,4-dichlorophenol(DCP) catalyzed by iron(II) phthalocyanine(Fe(II)Pc) was developed for the determination of DCP. The optical oxygen sensing fi lm containin... A new fi ber optic sensor based on the oxidation of 2,4-dichlorophenol(DCP) catalyzed by iron(II) phthalocyanine(Fe(II)Pc) was developed for the determination of DCP. The optical oxygen sensing fi lm containing fl uorescence indicator Ru(bpy)3Cl2 was used to detect the consumption of oxygen in solution. Moreover, a lock-in amplifier was used to determine the lifetime of the sensor head by detecting its phase delay change. The results reveal that the sensor has a linear detection range of 1.0×10^-6- 9.0×10^-5 mol/L and a response time of 5 min. The sensor also has high selectivity, good repeatability and stability. It can be used effectively to determine DCP concentration in real samples. 展开更多
关键词 2 4-dichlorophenol iron(II) phthalocyanine phase delay change fiber optic sensor stability
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SnO_(2)/Co_(3)O_(4)nanofibers using double jets electrospinning as low operating temperature gas sensor 被引量:1
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作者 Zhao Wang Shu-Xing Fan Wei Tang 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第2期618-625,共8页
SnO_(2)/Co_(3)O_(4)nanofibers(NFs)are synthesized by using a homopolar electrospinning system with double jets of positive polarity electric fields.The morphology and structure of SnO_(2)/Co_(3)O_(4)hetero-nanofibers ... SnO_(2)/Co_(3)O_(4)nanofibers(NFs)are synthesized by using a homopolar electrospinning system with double jets of positive polarity electric fields.The morphology and structure of SnO_(2)/Co_(3)O_(4)hetero-nanofibers are characterized by using field emission scanning electron microscope(FE-SEM),transmission electron microscope(TEM),x-ray diffraction(XRD),and x-ray photoelectron spectrometer(XPS).The analyses of SnO_(2)/Co_(3)O_(4)NFs by EDS and HRTEM show that the cobalt and tin exist on one nanofiber,which is related to the homopolar electrospinning and the crystallization during sintering.As a typical n-type semiconductor,Sn O_(2)has the disadvantages of high optimal operating temperature and poor reproducibility.Comparing with Sn O_(2),the optimal operating temperature of SnO_(2)/Co_(3)O_(4)NFs is reduced from 350℃to 250℃,which may be related to the catalysis of Co_(2)O_(2).The response of SnO_(2)/Co_(3)O_(4)to 100-ppm ethanol at 250℃is 50.9,9 times higher than that of pure Sn O_(2),which may be attributed to the p–n heterojunction between the n-type Sn O_(2)crystalline grain and the p-type Co_(2)O_(2)crystalline grain.The nanoscale p–n heterojunction promotes the electron migration and forms an interface barrier.The synergy effects between Sn O_(2)and Co_(2)O_(2),the crystalline grain p–n heterojunction,the existence of nanofibers and the large specific surface area all jointly contribute to the improved gas sensing performance. 展开更多
关键词 SnO_(2)/Co_(3)O_(4)nanofibers(NFs) homopolar double jets electrospinning gas sensors nanoscale p-n heterojunction
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Improvement of the Sensitivity of ZnGa_2O_4 Gas Sensors by Electron Beam Irradiation
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作者 Zhen Li Minghong Wu Zheng Jiao Haijian Zhong Jinhua Wang 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2006年第A03期143-145,共3页
In the present paper,the electron beam irradiation was used to improve gas sensing properties of ZnGa_2O_4 gas sensors.The effects of electron beam irradiation on the performance of ZnGa_2O_4 gas sensors were reported... In the present paper,the electron beam irradiation was used to improve gas sensing properties of ZnGa_2O_4 gas sensors.The effects of electron beam irradiation on the performance of ZnGa_2O_4 gas sensors were reported.Results show that the sensitivity of ZnGa_2O_4 gas sensors to various gases increased after electron beam irradiation,and the optimal working temperature decreased.The effect of irradiation dose and the reaction mechanism were discussed. 展开更多
关键词 electron beam IRRADIATION ZnGa2O4 gas sensor
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Toluene Sensing Properties of P4VP/Multi-Walled Carbon Nanotubes Multi-Layer Film Sensors
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作者 Jian Liao Guang-Zhong Xie +4 位作者 Hui-Ling Tai Ya-Dong Jiang Wei-Zhi Li Yong Zhou Fang Xu 《Journal of Electronic Science and Technology》 CAS 2013年第3期317-321,共5页
Abstract--Poly4-vinylphenol (P4VP)/multi-wan carbon nanotubes (MWNTs) multi-layer sensitive films were deposited on interdigitated electrodes by airbrush technology to detect toluene vapor at room temperature. The... Abstract--Poly4-vinylphenol (P4VP)/multi-wan carbon nanotubes (MWNTs) multi-layer sensitive films were deposited on interdigitated electrodes by airbrush technology to detect toluene vapor at room temperature. The surface and section morphologies of the multi-layer films were observed by a scanning electron microscope (SEM). It is found that the resistance of the sensor increases when it is exposed to toluene vapor and the response has a good linearity with the concentration of toluene. The results show that the P4VP/MWNTs three-layer film sensors have better sensing properties compared with the two-layer film sensors. The related sensing mechanism is studied in detail. 展开更多
关键词 Index Terms-Gas sensor multi-wall carbonnanotubes multi-layer film poly4-vinylphenol toluene.
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