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Studies on Synthesis and Sensing Characteristics of Nanocrystalline HoFeO3
Niu Xinshu*,Du Weimin,Du Weiping,Jiang Kai
Author NameAffiliationE-mail
Niu Xinshu* College of Chemistry & Environmental ScienceHe'nan Normal UniversityKey laboratory of Environmental Science and Engineering Education Commission of He'nanXinxiang 453002 duweimin0081@163.com 
Du Weimin College of Chemistry & Environmental ScienceHe'nan Normal UniversityKey laboratory of Environmental Science and Engineering Education Commission of He'nanXinxiang 453002  
Du Weiping College of Chemistry & Environmental ScienceHe'nan Normal UniversityKey laboratory of Environmental Science and Engineering Education Commission of He'nanXinxiang 453002  
Jiang Kai College of Chemistry & Environmental ScienceHe'nan Normal UniversityKey laboratory of Environmental Science and Engineering Education Commission of He'nanXinxiang 453002  
Abstract:
To develop gas sensing materials with high performance,high sensitivity,excellent selectivity and quick response & recovery behavior,nanocrystalline material of rare-earth composite oxide HoFeO3 with the structure of perovskite type was synthesized by sol-gel method in the system of citric acid with the Ho2O3,Fe(NO3)3·9H2O,nitric acid(1: 1 vloume fraction)as the starting materials. The structure and crystal state of the powder were determined on an X-ray diffractometer(Germany Bluker D8-Advance)with a Cu K" radiation(wavelength λ = 0. 15406 nm)operating at 20 mA and 40 kV. The shape and size were analyzed with the help of JEM-100SX Transimission electron microscopy. The results show this perovskite-type oxide is spherical with the mean grain size of 25 nm and the dispersity of it is good. The influence of temperature on the sensitivity of sensors,gas sensors's selectivity and the response and recovery characteristics are tested at the optimum working temperature 310℃. The study of sensor's gas sensing characteristic shows that the sensitivities of HoFeO3 to 0. 5! C2H5OH is 103,which is 5 times of other tested gases,such as H2S、H2、SO2、gasoline and acetone. So the sensors based on HoFeO3 show good sensitivity and selectivity to C2H5OH. The response and reversion characteristic of sensor to 0. 5! ethanol at 310℃ is good too. The response time and recovery time are 12 and 7s,respectively.
Key words:  Holmium iron oxide,Nanocrystalline,Perovskite-type,Gas-sensing material
FundProject:
纳米晶HoFeO3的合成及其气敏性能研究
牛新书*,杜卫民,杜卫平,蒋凯
摘要:
为开发新型具有高性能的气敏材料,以Ho2O3、Fe(NO3)3·9H2O、硝酸(1: 1)为原料,在柠檬酸体系中,用溶胶凝胶法合成了具有钙钛矿结构的稀土复合氧化物HoFeO3;用XRD、TEM对产物的组成、粒径大小、形貌进行了表征. 结果表明,产物为纳米颗粒,平均粒径为25 nm左右,且为颗粒均匀的圆球形. 另外,在最佳工作温度为310℃时,采用静态配气法测试了材料的气敏性能,发现HoFeO3对体积分数为0. 05%的乙醇的灵敏度高达103,高出其它被测气体5倍以上,因此,HoFeO3对乙醇有较好的灵敏度
关键词:  铁酸钬  纳米晶  钙钛矿结构  气敏材料
DOI:10.1088/1674-0068/17/1/79-82
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