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Amperometric Hydrogen Peroxide Biosensor Based on Horseradish Peroxidase Entrapped in Titania Sol-Gel Film on Screen-Printed Electrode
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作者 Reza E. Sabzi Fereshteh Rasouli Farshad Kheiri 《American Journal of Analytical Chemistry》 2013年第11期607-615,共9页
We report the fabrication of disposable and flexible Screen-Printed Electrodes (SPEs). This new type of screen-printed electrochemical platform consists of Ag nanoparticles (AgNPs) and graphite composite. For this pur... We report the fabrication of disposable and flexible Screen-Printed Electrodes (SPEs). This new type of screen-printed electrochemical platform consists of Ag nanoparticles (AgNPs) and graphite composite. For this purpose, silver nanoparticles were first synthesized by a chemical reduction method. The morphology and structure of the AgNPs were analyzed using a Scanning Electron Microscope (SEM) and UV-Visible spectroscopy. Graphite was chosen as the working electrode material for the fabrication of a thick-film. The fabrication of a screen-printed hydrogen peroxide biosensor consisting of three electrodes on a polyethylene terephthalate (PET) substrate was performed with a spraying approach (working, counter and reference: enzyme electrode, graphite, pseudo reference: Ag/AgCl). This biosensor was fabricated by immobilizing the peroxidase enzyme (HRP) in a Titania sol-gel membrane which was obtained through a vapor deposition method. The biosensor had electrocatalytic activity in the reduction of H2O2 with linear dependence on H2O2 concentration in the range of 10-5 to 10-3 M;the detection limit was 4.5 × 10-6 M. 展开更多
关键词 Screen-Printed ELECTRODE Ag NANOPARTICLE titania sol-gel BIOSENSOR
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Infrared Spectroscopy of Titania Sol-Gel Coatings on 316L Stainless Steel
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作者 Daniela Cordeiro Leite Vasconcelos Vilma Conceicao Costa +3 位作者 Eduardo Henrique Martins Nunes Antonio Claret Soares Sabioni Massimo Gasparon Wander Luiz Vasconcelos 《Materials Sciences and Applications》 2011年第10期1375-1382,共8页
Sol-gel titania films were deposited on 316L stainless steel using titanium isopropoxide as a chemical precursor. Dip-coating was performed at withdrawal speeds of 6 mm/min, 30 mm/min, and 60 mm/min. Deposited gel fil... Sol-gel titania films were deposited on 316L stainless steel using titanium isopropoxide as a chemical precursor. Dip-coating was performed at withdrawal speeds of 6 mm/min, 30 mm/min, and 60 mm/min. Deposited gel films were heat treated in air at 80℃, 100℃, 300℃, and 400℃. The structural evolution of the coatings was evaluated by infrared reflection-absorption spectroscopy. The influence of the withdrawal speed and the heat treatment temperature on the structure of the films was studied by varying the reflectance incidence angle during the infrared experiments and by Glow Discharge Spectrometry. Free functional groups were detected. The results indicate the formation of bidendate bridging coordination of carboxylic acid to titanium. Titanium atoms can also be pentacoordinated according to the processing conditions of the films. We observed a tendency of increasing amounts of OH groups with decreasing reflectance incidence angle. The film hardness was measured via Knoop microindenation hardness test. 展开更多
关键词 FILMS sol-gel Infrared Spectroscopy Glow Discharge Spectrometry Knoop Hardness
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Synthesis and Luminescence Properties of Ternary Europium Complexes inTitania Matrix in the Presence of Dimethylformamide by a Sol-Gel Process
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作者 符连社 张洪杰 +3 位作者 孟庆国 王淑彬 杨魁跃 倪嘉缵 《Journal of Rare Earths》 SCIE EI CAS CSCD 1999年第4期259-262,共4页
In-situ synthesis of ternary europium complex with thenoyltrifluoacetone (TTA) and 1,10-phenanthroline (phen) in titania matrix in the presence of dimethylformamide (DMF) by a sol-gel process was described, which was ... In-situ synthesis of ternary europium complex with thenoyltrifluoacetone (TTA) and 1,10-phenanthroline (phen) in titania matrix in the presence of dimethylformamide (DMF) by a sol-gel process was described, which was confirmed by the luminescence excitation spectra and infrared spectra. The titania gel that contains europium complex exhibits Eu3+ characteristic emission bands and presents a longer fluorescence lifetime than the pure complexes dissolved in ethanol solution. The concentration effect on the luminescence intensity was also investigated. 展开更多
关键词 rare earths sol-gel method in-situ synthesis titania DIMETHYLFORMAMIDE
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Sol-gel derived bioactive hydroxyapatite/titania composite films on Ti6Al4V
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作者 Bing Su Guoqing Zhang +1 位作者 Xudong Yu Chengtao Wang 《Journal of University of Science and Technology Beijing》 CSCD 2006年第5期469-475,共7页
The composite films consisting of the titania gel impregnated with hydroxyapatite (HAP) submicron particles were prepared on commercial Ti6A14V plates processed by a sol-gel route. HAP powders were synthesized based... The composite films consisting of the titania gel impregnated with hydroxyapatite (HAP) submicron particles were prepared on commercial Ti6A14V plates processed by a sol-gel route. HAP powders were synthesized based on wet chemical precipitation method with Ca(NO3)2.4H2O and (NH4)2HPO4 as starting reagents. After being calcined at 900℃, HAP powders were ultrasonically scattered in ethanol to produce HAP sol. The titania sol was prepared using titanium (IV) isopropoxide {Ti[OCH(CH3)2]4} as precursor. Both the titania sol and the HAP/titania mixture were sequentially spin-coated on the substrates and calcined at various temperatures. The characteristics and mechanical adhesion of the composite films were investigated. The results show that the as-prepared films are dense, homogeneous, well-crystallized, and there is a good interfacial adhesion between the film and the substrate. The in vitro bioactivities of these films were discussed based on the analysis of the variations of Ca and P concentrations in the simulated body fluid and their surface morphologies against immersion time. 展开更多
关键词 titania HYDROXYAPATITE composite film sol-gel route
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微波辅助sol-gel法合成Bi_(0.5)Na_(0.5)TiO_(3)粉体及其压电性能研究
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作者 武家莹 刘佳 +3 位作者 胡月 房国丽 郭小雷 范玉杰 《宁夏大学学报(自然科学版)》 CAS 2024年第2期218-224,共7页
采用微波辅助溶胶-凝胶(sol-gel)法制备Bi_(0.5)Na_(0.5)TiO_(3)(BNT)粉体,通过DSC/TG,XRD,SEM,FT-IR等表征方法,分析BNT的反应历程,煅烧温度对BNT成分、晶粒尺寸和压电性能的影响.结果表明,当微波煅烧温度为650℃时,可合成出高纯度BNT... 采用微波辅助溶胶-凝胶(sol-gel)法制备Bi_(0.5)Na_(0.5)TiO_(3)(BNT)粉体,通过DSC/TG,XRD,SEM,FT-IR等表征方法,分析BNT的反应历程,煅烧温度对BNT成分、晶粒尺寸和压电性能的影响.结果表明,当微波煅烧温度为650℃时,可合成出高纯度BNT粉体(30~120 nm),其居里温度为394℃,d_(33)=7.5 pC/N,ε_(r)=535.58,tanδ=0.29.对比传统马弗炉煅烧sol-gel法,微波辅助sol-gel法有利于提高BNT的介电性能和居里温度,降低介质损耗. 展开更多
关键词 钛酸铋钠 溶胶-凝胶(sol-gel)法 微波烧结 介电损耗 压电性能
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Synthesis and Characterization of Titania and Rare Earth Doped Titania Nanoparticles by Sol-gel Process
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作者 林萍 咸春颖 +1 位作者 毛志平 郑利民 《Journal of Donghua University(English Edition)》 EI CAS 2006年第5期108-112,共5页
Titania sol has been prepared by the sol-gel process with Ti(OC4H9)4, as precursor. TiO2 gel was obtained through hydrolysis and condensation process. Rare earth such as La2O3, CeO2 and Gd2O3 were introduced into th... Titania sol has been prepared by the sol-gel process with Ti(OC4H9)4, as precursor. TiO2 gel was obtained through hydrolysis and condensation process. Rare earth such as La2O3, CeO2 and Gd2O3 were introduced into the nanostructure TiO2. After TiO2 and rare earth doped TiO2 powders were calcined at 400℃, 500℃, 600℃, 700℃ and 800℃ respectively, the characteristic analyses of the TiO2 samples were studied by UV-VIS, XRD and TEM etc. It was found that there are some stringer absorption peaks at 200 - 325 nm. The rare earth doping can increase the phase transition temperature convertin8 anatase phase into rutile phase, can decrease the grain size of TiO2particles and can improve the ann-UV capacity of the coating fabrics. 展开更多
关键词 sol-gel rare earth doping phase transition temPerature nanostructure TiO2 anti-UV caPacity.
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Development of a Low Temperature Sol-Gel-Derived Titania-Silica Implant Coating
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作者 Virpi Aaritalo Ville Meretoja +5 位作者 Teemu Tirri Sami Areva Timo Jamsa Juha Tuukkanen Ari Rosling Timo Narhi 《Materials Sciences and Applications》 2010年第3期118-126,共9页
Objective of this study was to develope low temperature sol-gel coatings for shape memory metal (NiTi) and evaluate their biocompatibility on NiTi suture material. A series of low temperature TiO2 and TiO2-SiO2 sol-ge... Objective of this study was to develope low temperature sol-gel coatings for shape memory metal (NiTi) and evaluate their biocompatibility on NiTi suture material. A series of low temperature TiO2 and TiO2-SiO2 sol-gel coatings were prepared on glass substrates. The silica content of TiO2-SiO2 coatings ranged from 0 to 30 mol%. The coatings were also prepared with polyethyleneglycol (PEG). The contact angle and photocatalytic activity measurements were used to evaluate the surface properties of the coatings. Stability of the coatings was tested in simulated body fluid (SBF). The TiO2-SiO2 90/10 film made with PEG was more hydrophilic, showed photocatalytic activity and was crack-free after the SBF test, thus it was chosen to animal experiment as a new experimental coating. Uncoated NiTi suture and the suture coated with high temperature TiO2 were used as reference materials. NiTi sutures were inserted subcutaneously on the back of rat for four weeks. In routine histological examinations all materials showed good biocompatibility with mild inflammatory cell reaction. No significant differences in the soft tissue response among the materials were observed. Both the high and new low temperature processed sol-gel coatings remained attached on the sutures confirming the suitability of the coating technique on thin NiTi sutures. 展开更多
关键词 sol-gel Technique titania-SILICA Thin Film Bioactive Coating NITI Soft Tissue
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Sol-gel synthesis of nanometer silicon/silicon suboxide/carbon anode material
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作者 QIN Tong WANG Zheng LI Zhengzheng 《Baosteel Technical Research》 CAS 2024年第2期12-18,共7页
A stacked Si/SiO_(x)/C composite anode material with carbon-coated structure was prepared by sol-gel method combined with carbothermal reduction using organic silicon.The results of X-ray diffractometry, scanning elec... A stacked Si/SiO_(x)/C composite anode material with carbon-coated structure was prepared by sol-gel method combined with carbothermal reduction using organic silicon.The results of X-ray diffractometry, scanning electron microscopy, and elemental analysis show that the Si/SiO_(x)/C material is a secondary particle with a porous micronanostructure, and the presence of nanometer silicon does not affect the carbothermal reduction and carbon coating.Electrochemical test results indicate that the specific capacity and first coulombic efficiency of SiO_(x)/C composite with nanometer silicon can be increased to 1 946.05 mAh/g and 76.49%,respectively.The reversible specific capacity of Si/SiO_(x)/C material blended with graphite is 749.69 mAh/g after 100 cycles at a current density of 0.1 C,and the capacity retention rate is up to 89.03%.Therefore, the composite has excellent electrochemical cycle stability. 展开更多
关键词 sol-gel method nanometer silicon silicon suboxide anode material
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Development of Modified Glasses by Transparent, Functional Hybrid Sol-Gel Nano-Ceramic Coatings, a Comparative Study
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作者 Md. Barkat Ullah Yeasmin Akter +1 位作者 Khodeja Afrin Md. Saiful Quddus 《World Journal of Engineering and Technology》 2024年第1期170-184,共15页
This paper concentrates on the development of glasses with self-cleaning surfaces exhibiting high water contact angles. In this study, we prepared super-hydrophobic nano-ceramic coated glass based on titania & sil... This paper concentrates on the development of glasses with self-cleaning surfaces exhibiting high water contact angles. In this study, we prepared super-hydrophobic nano-ceramic coated glass based on titania & silica using simple sol-gel & dip coating methods and studied the best composition of the coatings by altering ratios of titanium tetraisopropoxide (TTIP)/tetraethyl orthosilicate (TEOS) with different homogenizing agents. We characterized the coatings by surface roughness measurement, percentage of optical transmission, static contact angle, near-infrared (NIR) transmission, and diffuse reflectance. The fabrication of coatings on glass substrates played an important role in increasing the water contact angle of about 95° and visible & NIR transmission of about 90%. We compared our modified glass substrate with commercial low emissivity (Low E) glass using X-ray diffraction (XRD) analysis, which showed pure amorphous surface claiming excellent wettability and thus the prepared glass substrate could have a variety of applications in different fields. 展开更多
关键词 sol-gel Nano-Ceramic Coatings Self-Cleaning Glass Water Contact Angle Optical Transmission
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Sol-Gel法制备纳米TiO_2过程中水解pH值的影响及其性能表征 被引量:23
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作者 王瑞斌 戴松元 王孔嘉 《功能材料》 EI CAS CSCD 北大核心 2002年第3期296-297,302,共3页
采用钛酸四异丙酯 [Ti(i-OC3 H7) 4 ]水解法制备纳米TiO2 粉体 ,水解过程中有很多参数对纳米TiO2 的特性产生影响 ,通过控制制备过程中的水解pH值 ,可以得到不同粒径和不同晶型的纳米TiO2 粉体。本文主要探讨了纳米TiO2 晶型转变的条件... 采用钛酸四异丙酯 [Ti(i-OC3 H7) 4 ]水解法制备纳米TiO2 粉体 ,水解过程中有很多参数对纳米TiO2 的特性产生影响 ,通过控制制备过程中的水解pH值 ,可以得到不同粒径和不同晶型的纳米TiO2 粉体。本文主要探讨了纳米TiO2 晶型转变的条件和晶粒度Dhkl随pH值变化的趋势。并利用XRD、TEM对粉体颗粒的形貌、大小、物相组成进行分析。XRD分析研究表明 。 展开更多
关键词 水解 PH值 性能表征 纳米晶 相变 溶相-凝胶法 二氧化钛
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Surface modification of NiTi alloy by sol-gel derived porous TiO_(2)film 被引量:3
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作者 付涛 吴晓明 +3 位作者 吴锋 罗孟 董兵辉 纪元 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第7期1661-1666,共6页
Titania films with nano-sized pores were prepared on the NaOH?HCl pretreated NiTi alloy substrate by sol?gel method.A crack-free film is obtained for the sample with a dense inner layer and a porous outside layer(s... Titania films with nano-sized pores were prepared on the NaOH?HCl pretreated NiTi alloy substrate by sol?gel method.A crack-free film is obtained for the sample with a dense inner layer and a porous outside layer(sample TC1+1).The X-ray diffraction shows that the titania films are composed of anatase,and a little Ni4Ti3 phase in the heat treated substrate is also detected.The X-ray photoelectron spectroscopy results indicate that the titania film completely covered the NiTi substrate for sample TC1+1.The sample TC1+1 is hydrophilic with a contact angle about 20°,and UV illumination treatment for 15 min further decreases the contact angle to(9.2±3.2)°.The potentiodynamic polarization test in 0.9% NaCl solution reveals a better corrosion resistance of sample TC1+1 than the polished NiTi sample. 展开更多
关键词 NiTi alloy titania sol-gel method HYDROPHILICITY corrosion resistance
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Sol-Gel法制备TiO_2粉末的光催化性能研究 被引量:24
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作者 陶国忠 古宏晨 +1 位作者 陈爱平 薛仲华 《华东理工大学学报(自然科学版)》 EI CAS CSCD 北大核心 2000年第1期62-65,共4页
通过溶胶-凝胶(Sol-Gel)技术制备出比表面积高、孔径分布窄的锐钛型二氧化钛粉末,并用热重分析、X-射线衍射、比表面仪、透射电镜、元素分析、红外光谱等方法进行表征。以甲苯气相光氧化降解为模型反应,对其催化性能进行... 通过溶胶-凝胶(Sol-Gel)技术制备出比表面积高、孔径分布窄的锐钛型二氧化钛粉末,并用热重分析、X-射线衍射、比表面仪、透射电镜、元素分析、红外光谱等方法进行表征。以甲苯气相光氧化降解为模型反应,对其催化性能进行评价并与商业化产品Degussa P-25 进行比较。实验结果表明,比表面积为128m 2/g、孔径为6.81nm 、晶粒尺寸为8.34nm 、团聚体为200~300nm 的锐钛型二氧化钛粉体具有良好的催化活性。 展开更多
关键词 溶胶-凝胶技术 二氧化钛 纳米粉体
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Synthesis of rutile from high titania slag by pyrometallurgical route 被引量:6
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作者 张力 李光强 张武 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第10期2317-2322,共6页
A new technique was developed for the conversion of high titania slag,containing 70%-75% TiO2 and with MgO,FeO,CaO,Al2O3 and SiO2 as main impurities,into a synthetic rutile,90%-95% TiO2,which satisfies the requirement... A new technique was developed for the conversion of high titania slag,containing 70%-75% TiO2 and with MgO,FeO,CaO,Al2O3 and SiO2 as main impurities,into a synthetic rutile,90%-95% TiO2,which satisfies the requirements for fluidizing chlorination process with respect to impurity contents.After a pre-oxidation at around 1 042 ℃ and a heat-treatment above 1 510 ℃,the Ti components in high titania slag can be enriched into the rutile phase which can precipitate and grow,and can be separated with dilute hydrochloric and sulfuric acid,respectively.The results show that the average crystal size of rutile phase is over 25 μm,and the synthetic rutile containing more than 95% TiO2 can be produced by selective leaching. 展开更多
关键词 high titania slag oxidation LEACHING RUTILE
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Sol-Gel法制备ZnO压敏陶瓷及其电性 被引量:30
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作者 刘素琴 黄可龙 +1 位作者 宋志方 彭斌 《无机材料学报》 SCIE EI CAS CSCD 北大核心 2000年第2期376-380,共5页
采用溶胶-凝胶(sol-gel)工艺制备ZnO电压敏陶瓷粉体.探讨其制备的最佳工艺条件:以 Zn(NO3)2与 NaOH为反应前驱物制取胶体, Zn2+浓度控制在 0.5mol·L-1以上, pH值7.5左右,预烧温... 采用溶胶-凝胶(sol-gel)工艺制备ZnO电压敏陶瓷粉体.探讨其制备的最佳工艺条件:以 Zn(NO3)2与 NaOH为反应前驱物制取胶体, Zn2+浓度控制在 0.5mol·L-1以上, pH值7.5左右,预烧温度300℃,陶瓷烧结温度1200℃;制得的压敏电阻的非线性系数α=28;研究了稀土La2O3掺杂对该陶瓷电性的影响:低浓度掺杂时,可提高压敏电压,高浓度掺杂时;不呈现压敏特性;对粉体进行了X射线衍射和透射电镜分析,预烧后得到五元掺杂的ZnO粉体粒形呈球状,属六方晶系,粒径分布窄,约为40~80nm. 展开更多
关键词 ZnO陶瓷 sol-gel 压敏电阻
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TiO_2的微波辐射Sol-Gel法制备及其光催化性能 被引量:8
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作者 夏启斌 李忠 +2 位作者 奚红霞 徐科峰 肖静 《华南理工大学学报(自然科学版)》 EI CAS CSCD 北大核心 2003年第11期92-96,共5页
采用微波辐射Sol Gel法在石英砂表面制备负载型TiO2 光催化剂 ,考察不同加热方式 ,微波功率以及微波加热温度对溶胶质量的影响 ,微波加热反应制备的溶胶粒子平均粒径小于常规加热反应制备得到的溶胶粒子 ,微波加热反应适宜条件是微波功... 采用微波辐射Sol Gel法在石英砂表面制备负载型TiO2 光催化剂 ,考察不同加热方式 ,微波功率以及微波加热温度对溶胶质量的影响 ,微波加热反应制备的溶胶粒子平均粒径小于常规加热反应制备得到的溶胶粒子 ,微波加热反应适宜条件是微波功率6 0 0W ,反应温度为 90℃ .以苯酚为光催化降解研究对象 ,考察了两种方式制备的负载型TiO2 光催化剂的催化性能 ,实验结果表明微波辐射Sol Gol法制备的负载型TiO2 光催化剂光催化性能也优于常规Sol Gel法制备的负载型TiO2 光催化剂 . 展开更多
关键词 二氧化钛 微波 sol-gel 光催化
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Sol-Gel技术与纳米材料的化学剪裁 被引量:50
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作者 孙继红 张晔 +2 位作者 范文浩 吴东 孙予罕 《化学进展》 SCIE CAS CSCD 1999年第1期80-85,共6页
本文以SiO2纳米材料为实例,阐述了sol-gel化学的基本概念,讨论了SiO2纳米材料在结构剪裁和性能调控方面的研究进展和前沿问题,并指出sol-gel技术已经成为实现化学剪裁合成纳米材料的主要手段。
关键词 纳米技术 sol-gel 化学裁剪 纳米材料 二氧化硅
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Synthesis of C-Cl-codoped titania/attapulgite composites with enhanced visible-light photocatalytic activity 被引量:11
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作者 邓丽娟 谢毅 张高科 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2017年第2期379-388,共10页
We demonstrate the synthesis of C-Cl-codoped titania/attapulgite(TiO2/ATT) composites containing a mixture of TiO2 phases by a facile sol-gel method at 70 ℃ using titanium tetraisopropoxide as the TiO2 precursor an... We demonstrate the synthesis of C-Cl-codoped titania/attapulgite(TiO2/ATT) composites containing a mixture of TiO2 phases by a facile sol-gel method at 70 ℃ using titanium tetraisopropoxide as the TiO2 precursor and ATT as a support for the TiO2 nanoparticles.The photocatalytic activity of the C-Cl-codoped TiO2/ATT composites with mixed anatase/brookite/rutile phases obtained at pH= 3.0 was much higher than that of commercially available Degussa P25 for the photocatalytic degradation of acid red G under visible-light irradiation.The excellent photocatalytic activity of the developed composite originates from the nonmetal codoping,which extends the absorption edge of TiO2 into visible region,and the presence of multiple phases,which slow the recombination of photoexcited electron/hole pairs.The formation of hydroxyl radicals during the photocatalytic degradation process was detected by photoluminescence probing using terephthalic acid.A mechanism for photocatalysis over the C-Cl-codoped TiO2/ATT composites was proposed. 展开更多
关键词 ANATASE RUTILE BROOKITE ATTAPULGITE C–Cl-codoped titania Visible light
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不同Ti/Ba摩尔比的钛酸钡纳米晶粉体的Sol-gel法制备与表征 被引量:18
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作者 吴淑荣 李东升 +1 位作者 畅柱国 熊为淼 《功能材料》 EI CAS CSCD 北大核心 1999年第2期179-181,共3页
采用Sol-gel法制备了不同Ti/Ba摩尔比的BayTixO3(x/y=0.990,1.000,1.010,1.020,1.045)纳米晶粉体。应用热分析、X射线粉末衍射、激光和透射电镜等技术对干凝胶热分解历程和粉... 采用Sol-gel法制备了不同Ti/Ba摩尔比的BayTixO3(x/y=0.990,1.000,1.010,1.020,1.045)纳米晶粉体。应用热分析、X射线粉末衍射、激光和透射电镜等技术对干凝胶热分解历程和粉体性能进行了研究,发现随Ti/Ba摩尔比的增加,粉体的平均晶粒尺寸、晶体结构和粉体粒度分布各呈现规律性变化。 展开更多
关键词 钛酸钡 纳米晶粉体 Ti/Ba摩尔比 sol-gel 表征
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纳米晶钛酸钡的Sol-gel法制备及其尺寸效应 被引量:22
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作者 郭惠芬 张兴堂 +3 位作者 刘兵 李蕴才 黄亚彬 杜祖亮 《物理化学学报》 SCIE CAS CSCD 北大核心 2004年第2期164-168,共5页
采用sol-gel法制备了不同粒径的钛酸钡(BT)纳米晶粉.XRD、Raman光谱和DSC测试结果显示,随着退火温度的升高,晶粒长大,晶胞的a轴逐渐减小,c轴逐渐增大.粒径在54nm左右时,钛酸钡由顺电立方相向铁电四方相结构转变,在立方-四方相变过程中,... 采用sol-gel法制备了不同粒径的钛酸钡(BT)纳米晶粉.XRD、Raman光谱和DSC测试结果显示,随着退火温度的升高,晶粒长大,晶胞的a轴逐渐减小,c轴逐渐增大.粒径在54nm左右时,钛酸钡由顺电立方相向铁电四方相结构转变,在立方-四方相变过程中,晶胞略微膨胀.随着粒径的减小,正交-四方相变温度升高,四方-立方相变温度降低,Raman谱峰降低和宽化,粒径为38nm左右时四方相的特征峰消失. 展开更多
关键词 纳米晶钛酸钡 sol-gel 制备 尺寸效应 相变 铁电性 晶胞参数
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多孔氧化铝模板结合sol-gel旋转涂敷法制备PZT纳米管 被引量:6
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作者 宋晔 蒋龙飞 +4 位作者 戚卫星 路超 朱绪飞 杭启明 朱信华 《功能材料》 EI CAS CSCD 北大核心 2012年第12期1605-1609,共5页
利用溶胶-凝胶旋转涂敷法在通孔的多孔阳极氧化铝(PAA)模板中制备了锆钛酸铅(PZT)纳米管,研究了溶胶浓度对样品形貌的影响。利用SEM和TEM观察了纳米管阵列和单根纳米管的形貌,采用XRD和EDS图谱分析了纳米管的相结构和化学元素组成。结... 利用溶胶-凝胶旋转涂敷法在通孔的多孔阳极氧化铝(PAA)模板中制备了锆钛酸铅(PZT)纳米管,研究了溶胶浓度对样品形貌的影响。利用SEM和TEM观察了纳米管阵列和单根纳米管的形貌,采用XRD和EDS图谱分析了纳米管的相结构和化学元素组成。结果表明合成的PZT纳米管结晶良好,具有钙钛矿结构(属于四方晶系);纳米管具有较高的韧性但表面较粗糙,直径和管壁厚度分别约为75和7nm,直径与原始PAA模板的孔径相吻合。在一定范围内调节PZT溶胶的浓度(0.1~0.4mol/L),均能在PAA模板的孔洞中形成PZT多晶纳米管,且组成PZT纳米管的晶粒随着溶胶浓度的增加而变大。 展开更多
关键词 氧化铝模板 sol-gel PZT 纳米管 制备
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