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采用水热法制备了Eu3+掺杂SrMgB6O11纳米发光材料.利用X射线粉末衍射仪(XRD)、场发射扫描电子显微镜(FESEM)和荧光光谱对SrMgB6O11:Eu3+样品进行表征.结果表明:采用水热法可以成功地合成粒度均匀、结晶完好的SrMgB6O11:Eu3+纳米发光粉.深入研究了反应温度和pH值对SrMgB6O11:Eu3+纳米材料的晶体结构及形貌的影响.结果表明,在120℃时形成了尖锐且强度最强的衍射峰,同时FESEM也表明此时所得材料为纳米棒组成的规则扇形形貌,此后随着温度的升高,XRD图中衍射峰的位置和强度发生变化,说明荧光粉的晶体结构发生变化,FESEM也表明该荧光粉已变为球形颗粒.归属了发射光谱和激发光谱中各激发峰所对应的能级跃迁.荧光光谱也显示:反应温度和pH值影响着Eu3+在晶格中的对称性,且反应温度为120℃及pH值为9时,Eu3+在晶格中的对称性较好.另外,还初步探讨了纳米粒子的生长机制. 相似文献
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以六水硝酸锌、六水硝酸铈、氧化石墨烯为原料,采用溶胶凝胶法制备了氧化石墨烯(GO)改性ZnO/CeO_2复合纳米紫外屏蔽剂。采用X射线衍射(XRD)、扫描电镜(SEM)、傅立叶变换红外光谱(FTIR)、紫外可见分光光度计(UV-Vis)等测试手段对产物的结构、组成及形貌进行表征,研究了氧化铈与氧化锌摩尔比、GO投入量、屏蔽剂用量以及pH值对复合纳米材料紫外屏蔽性能的影响,探索了氧化石墨烯改性ZnO/CeO_2复合纳米的最佳制备条件。结果表明:氧化石墨烯改性ZnO/CeO_2复合纳米材料中GO、CeO_2、ZnO的平均粒径分别为8. 3、15. 4、37. 5 nm。当pH 6. 0、氧化铈与氧化锌摩尔比为4∶1、GO投入量为2. 0g、屏蔽剂用量为0. 06 g/L时,紫外屏蔽性能强弱顺序为:氧化石墨烯改性ZnO/CeO_2复合纳米材料 GOZnO/CeO_2复合纳米材料 CeO_2 ZnO。 相似文献
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以TiO2纳米颗粒为前体,采用碱性水热法制备出钛酸盐纳米管(TNTs)与多壁碳纳米管(MWCNTs)的复合纳米材料(MWCNT-TNT);借助透射电子显微镜、傅立叶变换红外光谱仪和X射线衍射仪分析了纳米材料的结构、组成和形貌.将辣根过氧化酶,室温离子液体,Nafion和复合纳米材料共同修饰在电极表面组成酶电极,利用循环伏安法研究了该酶电极的电化学性能.结果表明,TiO2纳米颗粒完全转化为钛酸盐纳米管并且很好的与MWCNTs结合在一起;复合材料修饰酶电极的循环伏安行为明显优于TNTs修饰酶电极,表明引入MWCNTs可改善钛酸盐纳米材料的导电性以及电化学性能. 相似文献
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3-芳基取代噻吩大多是电致发光材料的前体化合物. 催化剂摩尔分数为0.5% 的二茂铁亚胺环钯化合物在DMF/K3PO4/80 ℃条件下, 能够有效地催化3-噻吩硼酸同芳基碘和芳基溴的Suzuki反应, 方便地合成系列3-芳基噻吩衍生物. 此方法操作简便, 不需要加入过量的3-噻吩硼酸, 催化剂用量小. 化合物3b, 3c和3d的发射光谱和激发光谱表明, 此类化合物具有潜在的发光应用性能. 相似文献
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研制了一种使用碳酸锶纳米材料作为敏感材料,用来检测空气中痕量乙醛气体的催化发光传感器。该传感器在342℃对乙醛有高灵敏度和选择性,在波长425nm处进行定量分析,催化发光强度与乙醛浓度的线性范围为6~6000mL/m^3(r=0.9995,n=8);检出限为2mL/m^3(信噪比=3)。外来物质如环己烷、四氯化碳、氨、苯、氯仿、甲苯、甲醇、乙醇及甲醛气体通过传感器时,除了乙醇和甲醛分别引起42.5%和12.5%的干扰外,其它气体不干扰测定。20000mL/m^3的水蒸气不干扰200mL/m^3乙醛气体的测定。连续1130h通过乙醛气体测试了传感器的稳定性。对含有乙醛、甲醛和苯的人工合成样品进行了分析。 相似文献
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丁基噻吩在硝基苯溶液中以六氟磷酸四丁基季铵盐为支持电解质,在恒电流条件下进行电化学氧化聚合,通过电导率的测量及可见──紫外光谱分析,讨论了单体浓度、电解质浓度、电流密度、聚合温度对聚合物膜的导电性能的影响。扫描电镜图表明,随着聚合的进行.膜的表面呈“菜花”状结构。循环伏安图表明聚了基噻吩与聚噻吩具有相近的氧化峰位。 相似文献
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通过化学方法将具有增塑效果的环状碳酸酯基团引入纳米SiO2表面,并用FTIR与TGA对改性纳米SiO2进行了表征.将改性纳米SiO2添加到以聚氧化乙烯(PEO)为基体的聚合物电解质中,制备了复合聚合物电解质.通过DSC和交流阻抗等方法对该聚合物电解质膜的热力学和电化学性能进行了研究.结果表明,掺杂改性纳米SiO2的聚合物电解质具有更高的离子电导率,室温最高离子电导率可达到1.84×10-5 S/cm;具有较高的锂离子迁移数,最高可达到0.49,且具有更好的界面稳定性. 相似文献
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本文首先采用油水界面法制备发光纳米ZnS粒子,再通过物理混合法,将其分散在溶有小分子胶凝剂的有机溶液中,流延于玻璃基质表面,得到ZnS荧光薄膜。实验结果表明,ZnS纳米粒子的平均粒径大小约为200 nm,具有立方晶型结构,并且在杂化薄膜中具有良好的分散性;胶凝剂形成的网络结构对ZnS纳米粒子具有良好的限域效应,表现为稳定的发光性能;气敏实验表明,该杂化膜对挥发性有机单胺和二胺具有灵敏的选择性传感作用;且其灵敏度随着杂化薄膜中ZnS担载量的增大逐渐提高;可逆性实验表明该薄膜对乙二胺蒸汽具有良好的可逆响应性。 相似文献
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PP/SiO2杂化复合材料的制备与性能研究 总被引:1,自引:0,他引:1
以正硅酸乙酯(TEOS),甲基丙烯酸甲酯(MMA)为主要原料,甲基丙烯酸一口一羟丙酯为活性单体,溶胶一凝胶法制备PMMA/SiO2杂化准凝胶,并以其为填充物对PP进行复合改性。采用FT-IR、XRD、SEM、PLM等对材料的结构进行分析,同时对其力学性能进行测试,研究了复合材料力学性能与组成、结构间的关系。研究发现,PMMA/SiO2杂化材料能诱导PP基体中口晶型的生成,并使PP球晶细化。PP/SiO2杂化复合材料(PSH)中siO2含量为2%(wt)时,缺口冲击强度较纯PP提高81%。 相似文献
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Preparation and Characterization of Ternary Europium ComplexDoped Thin SolGel Hybrid Film
by Fluorescence Spectroscopy* 总被引:1,自引:0,他引:1
IntroductionThelow-temperatureprocessingofthesol-gelmaterialmakesitpossibletoentraporganicspecieseasilywithinarigidglassmatri... 相似文献
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FU Lian-she ZHANG Hong-jie WANG Shu-bin MENG Qing-guo YANG Kui-yue NI Jia-zuan 《高等学校化学研究》1999,15(2):100-104
ernary europium complex with dibenzoylmethane(DBM), 1,10-phenanthroline(phen) was in-situ syn thesized in thin SiO2/polyvinyl butyral(PVB) hybrid films by a two-step sol-gel process, characterized by means of fluorescence spectroscopy. The luminescence spectra, fluorescence lifetimes, photostability were all investigated. The results showed that the hybrid films exhibited the characteristic emission bands of the central rare earth Eu3+. In addition, Eu3+ presented longer fluorescence lifetime than in an ethanol solution, the complex had a higher photostability in the hybrid film than in the PVB film containing the corresponding pure complex. 相似文献
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A novel materials design procedure based on the co-doping of metal nanoparticle and azo dye compound (MNPADC) is developed to improve the properties of functional molecules. The synthesized materials were characterized by transmission electron micrograph (TEM), ultraviolet-visible absorption spectra (UV-Vis) and fluorescence spectra (FS). It was found that the fluorescence intensity of methyl orange (MO) was enhanced by 5 times in the aqueous composite system doped with silver nanoparticles whereas it was reduced by 15% and 20% in composite films with co-mixing and coating structures, respectively. The results indicate that the properties of functional molecules can be greatly improved in composite film with supra molecular structure and that the procedure presented here is effective. 相似文献
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MA Xiaoye MA Xiaofei QIU Xuepeng LIU Fangfang JIN Rizhe KANG Chuanqing GUO Haiquan 《高等学校化学研究》2014,30(6):1047-1050
Imidazole-containing polyimide/silica(PI/SiO2) hybrid films were prepared from 3,3',4,4'-biphenyltetra- carboxylic dianhydride(BPDA) and 2,2'-di(p-aminophenyl)-5,5'-bibenzimidazole in N,N-dimethylacetamide(DMAc) by sol-gel method and thermal imidization. The hybrid film with high silica mass fraction up to 40% was transparent. Scanning electron microscope(SEM) and transmission electron microscope(TEM) results of the film indicate a ho- mogeneous dispersion of silica nanoparticles in the polyimide matrix. One hybrid film PI/SiO2 with 15% SiO2 exhi- bits better mechanical properties with a tensile strength of 222 MPa, an elongation at break of 12%, and a tensile modulus of 5.66 GPa. The reinforced mechanism on mechanical Drooerties was also studied. 相似文献
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Kang Xia Prof. Dr. Kazuya Yamaguchi Prof. Dr. Kosuke Suzuki 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2023,135(1):e202214506
Polyoxometalates (POMs), anionic metal-oxygen nanoclusters that possess various composition-dependent properties, are widely used to modify the existing properties of metal nanoparticles and to endow them with new ones. Herein, we present an overview of recent advances in hybrid materials that consist of metal nanoparticles and POMs. Following a brief introduction on the inception of this area and its development, representative properties and applications of these materials in various fields such as electrochemistry, photochemistry, and catalysis are introduced. We discuss how the combination of two classic inorganic materials facilitates cooperative and synergistic behavior, and we also give personal perspectives on the future development of this field. 相似文献
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Wenwan Zhong 《Analytical and bioanalytical chemistry》2009,394(1):47-59
Fluorescence-based detection is the most common method utilized in biosensing because of its high sensitivity, simplicity,
and diversity. In the era of nanotechnology, nanomaterials are starting to replace traditional organic dyes as detection labels
because they offer superior optical properties, such as brighter fluorescence, wider selections of excitation and emission
wavelengths, higher photostability, etc. Their size- or shape-controllable optical characteristics also facilitate the selection
of diverse probes for higher assay throughput. Furthermore, the nanostructure can provide a solid support for sensing assays
with multiple probe molecules attached to each nanostructure, simplifying assay design and increasing the labeling ratio for
higher sensitivity. The current review summarizes the applications of nanomaterials—including quantum dots, metal nanoparticles,
and silica nanoparticles—in biosensing using detection techniques such as fluorescence, fluorescence resonance energy transfer
(FRET), fluorescence lifetime measurement, and multiphoton microscopy. The advantages nanomaterials bring to the field of
biosensing are discussed. The review also points out the importance of analytical separations in the preparation of nanomaterials
with fine optical and physical properties for biosensing. In conclusion, nanotechnology provides a great opportunity to analytical
chemists to develop better sensing strategies, but also relies on modern analytical techniques to pave its way to practical
applications.
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Wenwan ZhongEmail: |
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《中国化学会会志》2017,64(11):1308-1315
In this study, the galvanic displacement reaction between silver and AuCl4− was carried out to synthesize a series of silver nanowire (Ag NW) @ gold nanoparticle (Au NP) hybrid nanowires. The influence of Ag NW @ Au NP hybrid nanowires on the fluorescence properties of the poly (3‐hexylthiophene) (P3HT) was investigated. The particle sizes of Au NPs on the hybrid nanowires could be adjusted by varying the reaction time and the concentration of the HAuCl4 solution. Furthermore, steady‐state fluorescence measurements showed that the fluorescence intensity of the P3HT films was higher on various Ag NW @ Au NP hybrid nanowires compared to that on a bare silicon substrate. This was due to the increase in the intensity of electromagnetic field by the localized surface plasmon resonances of Au NPs and surface plasmon polaritons of Ag NWs from the hybrid nanowires. The results were further confirmed by the Raman spectra of the P3HT films on different substrates. 相似文献
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采用无毒、无害的绿色方法合成聚氨酯,通过原位复合法制备出一种新型的聚氨酯/纳米二氧化钛杂化复合材料。利用傅里叶变换红外光谱分析(FTIR)、差示扫描量热分析方法(DSC)分别对聚氨酯/纳米二氧化钛杂化前后的结构进行表征。通过循环伏安法检测表明此杂化复合材料有良好的电化学稳定性及可逆性。采用荧光技术对聚氨酯/纳米二氧化钛杂化复合材料的性能进行研究。试验结果表明:当纳米二氧化钛与聚氨酯的质量比为100:7,超声时间为5 min时,得到的聚氨酯/纳米二氧化钛杂化复合材料的性能最好。 相似文献