无模板构建具有暴露特殊表面的空心α-Fe2O3六角形纳米柱颗粒以实现先进的气敏性能。
Template-free construction of hollow α-Fe2O3 hexagonal nanocolumn particles with an exposed special surface for advanced gas sensing properties.
作者信息
Sun Linqiang, Han Xiao, Liu Kai, Yin Shan, Chen Qiaoli, Kuang Qin, Han Xiguang, Xie Zhaoxiong, Wang Chao
机构信息
Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Department of Chemistry, School of Chemistry and Chemical Engineering, Jiangsu Normal University, Xuzhou, 221116, P. R. China.
出版信息
Nanoscale. 2015 Jun 7;7(21):9416-20. doi: 10.1039/c5nr01790d.
Hollow α-Fe2O3 hexagonal nanocolumn particles (HHCPs) with exposed (101[combining macron]0) and (112[combining macron]5) facets have been synthesized through a hydrothermal method in the absence of templates. The time-dependent experimental results demonstrate that the formation of HHCPs includes four main steps: (1) formation of nanowire precursors, (2) aggregation and conversion to Fe1.833(OH)0.5O2 solid ellipsoid particles (SEPs), (3) dehydration to form hollow ellipsoid particles (HEPs), and (4) recrystallization to HHCPs. Due to their advantages of the hollow structure and the exposed special external and internal surface on the pore structure, the HHCPs exhibit higher gas sensing ability than that of calcined SEPs (CSEPs) and HEPs.
通过水热法在无模板条件下合成了具有暴露的（101̅0）和（112̅5）晶面的空心α-Fe₂O₃六角形纳米柱颗粒（HHCPs）。随时间变化的实验结果表明，HHCPs的形成包括四个主要步骤：（1）纳米线前驱体的形成；（2）聚集并转化为Fe₁.₈₃₃(OH)₀.₅O₂实心椭球体颗粒（SEPs）；（3）脱水形成空心椭球体颗粒（HEPs）；（4）重结晶为HHCPs。由于其空心结构以及在孔结构上暴露的特殊内外表面的优势，HHCPs比煅烧后的SEPs（CSEPs）和HEPs表现出更高的气敏能力。
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